{"id":9710,"date":"2026-01-04T11:25:03","date_gmt":"2026-01-04T03:25:03","guid":{"rendered":"https:\/\/www.cncmachiningshops.com\/?p=9710"},"modified":"2026-01-05T11:59:10","modified_gmt":"2026-01-05T03:59:10","slug":"718-steel","status":"publish","type":"post","link":"https:\/\/www.cncmachiningshops.com\/es\/718-steel\/","title":{"rendered":"Acero 718: Composici\u00f3n qu\u00edmica, propiedades y aplicaciones de ingenier\u00eda en la fabricaci\u00f3n de moldes"},"content":{"rendered":"<div data-page-id=\"Ux2Ld16q5oekSLx4zPecdmRHn3e\" data-lark-html-role=\"root\" data-docx-has-block-data=\"true\">\n<p>El acero 718 es un acero aleado preendurecido que se utiliza a menudo para fabricar moldes de inyecci\u00f3n de pl\u00e1stico, especialmente para moldes de tama\u00f1o grande y mediano que deben ser resistentes, tenaces y dimensionalmente estables. El acero 718 es una versi\u00f3n mejorada de los aceros para moldes del tipo P20. Presenta una mayor uniformidad en la dureza, mejor maquinabilidad y un mejor rendimiento de pulido, lo que lo convierte en la mejor opci\u00f3n para aplicaciones de moldes complejas y de alta precisi\u00f3n.<\/p>\n<p>Desde el punto de vista de la ingenier\u00eda, el acero 718 resuelve una serie de problemas que surgen a la hora de fabricar moldes: reduce la deformaci\u00f3n durante el tratamiento t\u00e9rmico, acelera los plazos de entrega y mantiene constantes las propiedades mec\u00e1nicas de los bloques de molde de gran espesor. Este art\u00edculo analiza la composici\u00f3n qu\u00edmica, las propiedades mec\u00e1nicas y f\u00edsicas, la maquinabilidad, el comportamiento durante el tratamiento t\u00e9rmico y los usos habituales en ingenier\u00eda del acero 718. Esta informaci\u00f3n ayudar\u00e1 a los dise\u00f1adores de moldes, a los ingenieros de utillaje y a los equipos de compras a elegir los materiales en funci\u00f3n de las necesidades reales de fabricaci\u00f3n, en lugar de limitarse a seleccionar un tipo de acero.<\/p>\n<hr class=\"ng-star-inserted\" \/>\n<h2 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">\u00bfQu\u00e9 es el acero 718 y c\u00f3mo se clasifica?<\/span><\/h2>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Definici\u00f3n del material y posici\u00f3n en el sector<\/span><\/h3>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">El acero 718 es un acero para herramientas de baja aleaci\u00f3n y preendurecido, desarrollado espec\u00edficamente para la industria del moldeo por inyecci\u00f3n de pl\u00e1stico. Desde el punto de vista metal\u00fargico, pertenece a la <\/span><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Modificado seg\u00fan P20<\/span><\/strong><span class=\"ng-star-inserted\"> familia.<\/span><\/p>\n<ul class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">La situaci\u00f3n de partida:<\/span><\/strong><span class=\"ng-star-inserted\"> El acero P20 est\u00e1ndar (DIN 1.2311) es excelente para moldes peque\u00f1os, pero presenta una \u201cp\u00e9rdida de dureza\u201d en el centro de los bloques gruesos (secciones &gt;400 mm).<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">La soluci\u00f3n 718:<\/span><\/strong><span class=\"ng-star-inserted\"> Al a\u00f1adir aproximadamente <\/span><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">N\u00edquel 1%<\/span><\/strong><span class=\"ng-star-inserted\">, el acero 718 mejora <\/span><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">capacidad de templado<\/span><\/strong><span class=\"ng-star-inserted\">. De este modo se garantiza que un bloque de 600 mm de espesor presente una microestructura y una dureza uniformes desde la superficie hasta el n\u00facleo.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Normas y denominaciones comunes<\/span><\/h3>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Los ingenieros y los responsables de compras encontrar\u00e1n el 718 bajo diversas denominaciones internacionales. Aunque son qu\u00edmicamente similares, el proceso espec\u00edfico de fabricaci\u00f3n puede variar.<\/span><\/p>\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Tabla 1: Denominaciones internacionales del acero para moldes 718<\/span><\/strong><\/p>\n<div class=\"table-container ng-star-inserted\">\n<table>\n<tbody>\n<tr class=\"table-header ng-star-inserted\">\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Regi\u00f3n \/ Est\u00e1ndar<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Designaci\u00f3n<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Notas de ingenier\u00eda<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">China (GB)<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">3Cr2NiMo<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">La norma sobre composici\u00f3n qu\u00edmica.<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Europa (DIN\/EN)<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">1.2738<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">La norma europea principal para bases de molde de gran tama\u00f1o.<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">EE. UU. (AISI)<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">P20 + Ni<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">A menudo se especifica de forma gen\u00e9rica como \u201cP20 m\u00e1s n\u00edquel\u201d.\u201d<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Nombre del sector<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">718 \/ 718H<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">\u201c718\u201d suele referirse a una dureza de entre 28 y 34 HRC; \u201c718H\u201d se refiere a una dureza de entre 34 y 38 HRC.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Ingenier\u00eda para llevar:<\/span><\/strong><span class=\"ng-star-inserted\"> El 718 ocupa el \u201cpunto \u00f3ptimo\u201d en la selecci\u00f3n de aceros para moldes. Ofrece un mejor rendimiento que el P20 para piezas grandes o con acabado brillante, pero es considerablemente m\u00e1s f\u00e1cil de mecanizar y m\u00e1s econ\u00f3mico que los aceros de endurecimiento por precipitaci\u00f3n, como el NAK80, o los aceros inoxidables, como el S136.<\/span><\/p>\n<hr class=\"ng-star-inserted\" \/>\n<h2 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">\u00bfCu\u00e1l es la composici\u00f3n qu\u00edmica y la funci\u00f3n de los elementos de aleaci\u00f3n?<\/span><\/h2>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Las ventajas en cuanto a rendimiento del acero 718 frente al P20 est\u00e1ndar se deben a su dise\u00f1o espec\u00edfico de aleaci\u00f3n. No se trata solo de aumentar la dureza, sino de a\u00f1adir <\/span><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">uniformidad<\/span><\/strong><span class=\"ng-star-inserted\">.<\/span><\/p>\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Tabla 2: Composici\u00f3n qu\u00edmica t\u00edpica (wt.%)<\/span><\/strong><\/p>\n<div class=\"table-container ng-star-inserted\">\n<table>\n<tbody>\n<tr class=\"table-header ng-star-inserted\">\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Elemento<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Alcance t\u00edpico<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Puesto de ingenier\u00eda principal<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Carbono (C)<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">0.30 \u2013 0.40<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Aporta resistencia b\u00e1sica y permite obtener una estructura martens\u00edtica\/bain\u00edtica.<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Cromo (Cr)<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">1.40 \u2013 2.00<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Aumenta la templabilidad y proporciona una resistencia moderada a la corrosi\u00f3n.<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">N\u00edquel (Ni)<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">0.80 \u2013 1.20<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">El factor diferenciador clave.<\/span><\/strong><span class=\"ng-star-inserted\"> Aumenta la tenacidad y la capacidad de templado en profundidad.<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Molibdeno (Mo)<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">0.30 \u2013 0.55<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Evita la fragilidad por temperatura y mantiene la resistencia a altas temperaturas.<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Manganeso (Mn)<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">0.80 \u2013 1.00<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Desoxidante; contribuye a la templabilidad.<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Silicio (Si)<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">0.20 \u2013 0.40<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Desoxidante.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Por qu\u00e9 el n\u00edquel (Ni) es importante en el acero para moldes<\/span><\/h3>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">La adici\u00f3n de n\u00edquel es la caracter\u00edstica que define al 718. En los aceros est\u00e1ndar, la velocidad de enfriamiento en el centro de un bloque grande es demasiado lenta para formar una microestructura dura, lo que da lugar a puntos blandos.<\/span><\/p>\n<ul class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Endurecimiento:<\/span><\/strong><span class=\"ng-star-inserted\"> El n\u00edquel inhibe la formaci\u00f3n de fases de perlita m\u00e1s blandas durante el enfriamiento. Esto permite que se forme la microestructura dura deseada (martensita\/bainita) incluso en el centro de un bloque macizo, donde el enfriamiento es m\u00e1s lento.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Posibilidad de pulido:<\/span><\/strong><span class=\"ng-star-inserted\"> Una microestructura uniforme permite un pulido homog\u00e9neo. El P20 suele presentar bandas de segregaci\u00f3n que provocan un efecto de \u201cpiel de naranja\u201d u ondulaciones durante el pulido a espejo. La homogeneidad del 718 reduce significativamente este riesgo.<\/span><\/p>\n<\/li>\n<\/ul>\n<hr class=\"ng-star-inserted\" \/>\n<h2 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">\u00bfCu\u00e1les son sus propiedades mec\u00e1nicas y f\u00edsicas?<\/span><\/h2>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Para los dise\u00f1adores de moldes, las propiedades mec\u00e1nicas del acero 718 determinan la vida \u00fatil del molde, su resistencia a las fuerzas de sujeci\u00f3n y su capacidad para soportar las presiones de inyecci\u00f3n.<\/span><\/p>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Propiedades mec\u00e1nicas (en estado preendurecido)<\/span><\/h3>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">El 718 se utiliza casi exclusivamente en el estado de temple y revenido en el que lo suministra la f\u00e1brica.<\/span><\/p>\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Tabla 3: Propiedades mec\u00e1nicas t\u00edpicas (a temperatura ambiente)<\/span><\/strong><\/p>\n<div class=\"table-container ng-star-inserted\">\n<table>\n<tbody>\n<tr class=\"table-header ng-star-inserted\">\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Propiedad<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Valor (t\u00edpico)<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Interpretaci\u00f3n t\u00e9cnica<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Dureza<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">32 \u2013 38 HRC<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Se puede mecanizar con herramientas de metal duro; es lo suficientemente duro como para resistir el desgaste general.<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Resistencia a la tracci\u00f3n<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">~1000 \u2013 1150 MPa<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Alta resistencia al agrietamiento de la placa de molde bajo presi\u00f3n de sujeci\u00f3n.<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">L\u00edmite el\u00e1stico<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">~850 \u2013 950 MPa<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Evita la deformaci\u00f3n pl\u00e1stica de las l\u00edneas de separaci\u00f3n (rebabas).<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Alargamiento<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">&gt; 13%<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Buena tenacidad; resiste el agrietamiento en las esquinas internas pronunciadas.<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Impact Energy<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">&gt; 20 J (Charpy V)<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Resistencia a los golpes suficiente para ciclos r\u00e1pidos de moldeo.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Propiedades f\u00edsicas para el an\u00e1lisis t\u00e9rmico<\/span><\/h3>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Comprender las propiedades t\u00e9rmicas es fundamental para calcular los tiempos de los ciclos de enfriamiento y la dilataci\u00f3n t\u00e9rmica en moldes multimaterial (por ejemplo, en los que se combina el 718 con insertos de cobre-berilio).<\/span><\/p>\n<ul class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Densidad:<\/span><\/strong><span class=\"ng-star-inserted\"> 7,85 g\/cm\u00b3<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Conductividad t\u00e9rmica:<\/span><\/strong><span class=\"ng-star-inserted\"> ~29,0 W\/m\u00b7K (a 20 \u00b0C). <\/span><span class=\"ng-star-inserted\">Nota: Se trata de un nivel moderado. Para conseguir ciclos m\u00e1s r\u00e1pidos, a menudo se a\u00f1aden insertos de Cu-Be a los n\u00facleos de 718.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Coeficiente de expansi\u00f3n t\u00e9rmica:<\/span><\/strong><span class=\"ng-star-inserted\"> ~12,5 \u00b5m\/m\u00b7\u00b0C (20\u2013200 \u00b0C).<\/span><\/p>\n<\/li>\n<\/ul>\n<hr class=\"ng-star-inserted\" \/>\n<h2 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">\u00bfEs necesario el tratamiento t\u00e9rmico para el acero 718?<\/span><\/h2>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Una de las preguntas m\u00e1s frecuentes de los equipos de compras es si el 718 requiere un tratamiento t\u00e9rmico tras el mecanizado. <\/span><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">La respuesta general desde el punto de vista de la ingenier\u00eda es \u00abno\u00bb.<\/span><\/strong><\/p>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">La ventaja de \u201ctal y como se entrega\u201d<\/span><\/h3>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">El 718 se comercializa como \u201cpreendurecido\u201d. Esto supone una enorme ventaja log\u00edstica.<\/span><\/p>\n<ol class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Sin distorsi\u00f3n:<\/span><\/strong><span class=\"ng-star-inserted\"> Dado que el acero ya est\u00e1 endurecido, los fabricantes de moldes pueden mecanizar cavidades, taladrar conductos de refrigeraci\u00f3n y acabar el molde con la tolerancia final sin necesidad de enviarlo a un tratamiento t\u00e9rmico externo. No existe riesgo de que el molde se deforme o se agriete durante el enfriamiento r\u00e1pido.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Pulido inmediato:<\/span><\/strong><span class=\"ng-star-inserted\"> Una vez mecanizado, el molde est\u00e1 listo para pasar directamente al proceso EDM y al pulido.<\/span><\/p>\n<\/li>\n<\/ol>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">\u00bfSe puede volver a templar el 718?<\/span><\/h3>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">T\u00e9cnicamente, s\u00ed, pero es <\/span><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">No recomendado<\/span><\/strong><span class=\"ng-star-inserted\">.<\/span><\/p>\n<ul class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Riesgo:<\/span><\/strong><span class=\"ng-star-inserted\"> Si se calienta el 718 hasta temperaturas de austenizaci\u00f3n (aprox. 850 \u00b0C) y se somete a un temple, se perder\u00e1n las dimensiones de precisi\u00f3n obtenidas durante el mecanizado.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">L\u00edmite m\u00e1ximo de dureza:<\/span><\/strong><span class=\"ng-star-inserted\"> Incluso con un temple agresivo, el acero 718 rara vez supera los 50-52 HRC y se vuelve fr\u00e1gil. Si se requiere una dureza mayor, los ingenieros deben optar por un acero diferente (como el H13 o el 8407) desde el principio.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Endurecimiento superficial (nitruraci\u00f3n)<\/span><\/h3>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Aunque se evita el endurecimiento por volumen, <\/span><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Nitruraci\u00f3n<\/span><\/strong><span class=\"ng-star-inserted\"> es una opci\u00f3n excelente para el 718.<\/span><\/p>\n<ul class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Proceso:<\/span><\/strong><span class=\"ng-star-inserted\"> Nitruraci\u00f3n con gas o iones a temperaturas inferiores al punto de templado (aprox. 500 \u00b0C).<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Resultado:<\/span><\/strong><span class=\"ng-star-inserted\"> Crea una capa superficial dura (equivalente a unos 60-65 HRC) que ofrece resistencia al desgaste frente a pl\u00e1sticos abrasivos reforzados con fibra de vidrio, sin deformar el n\u00facleo del molde.<\/span><\/p>\n<\/li>\n<\/ul>\n<hr class=\"ng-star-inserted\" \/>\n<h2 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">\u00bfQu\u00e9 rendimiento ofrece el 718 en el mecanizado y el pulido? (DFM)<\/span><\/h2>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Para los ingenieros de fabricaci\u00f3n, la maquinabilidad del 718 es un factor fundamental a la hora de elaborar presupuestos y planificar los plazos.<\/span><\/p>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Caracter\u00edsticas de mecanizado del CNC<\/span><\/h3>\n<ul class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Grado de maquinabilidad:<\/span><\/strong><span class=\"ng-star-inserted\"> Bien. Se mecaniza de forma similar al P20, pero requiere un poco m\u00e1s de potencia debido a la mayor tenacidad que aporta el n\u00edquel.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Herramientas:<\/span><\/strong><span class=\"ng-star-inserted\"> Las herramientas de carburo recubiertas (TiAlN) son las habituales. Las herramientas de acero r\u00e1pido (HSS) se desgastan r\u00e1pidamente.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Uniformidad:<\/span><\/strong><span class=\"ng-star-inserted\"> La principal ventaja del 718 en el mecanizado es la ausencia de \u201cpuntos duros\u201d. Su estructura uniforme permite mantener velocidades de corte y avances constantes, lo que garantiza la fiabilidad del mecanizado sin supervisi\u00f3n.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">EDM (mecanizado por descarga el\u00e9ctrica)<\/span><\/h3>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">El 718 ofrece un rendimiento excelente en el proceso EDM. Su estructura homog\u00e9nea da lugar a una capa de refundici\u00f3n estable y uniforme (capa blanca).<\/span><\/p>\n<ul class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Buenas pr\u00e1cticas:<\/span><\/strong><span class=\"ng-star-inserted\"> La capa de refundici\u00f3n debe eliminarse mediante esmerilado o pulido con piedra, ya que es fr\u00e1gil y puede provocar grietas o fallos por fatiga en la superficie del molde.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Pulido y fotograbado<\/span><\/h3>\n<ul class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Pulido:<\/span><\/strong><span class=\"ng-star-inserted\"> El 718 permite obtener un acabado de alto brillo (SPI A2 o A3) con mucha m\u00e1s facilidad que el P20. La desgasificaci\u00f3n al vac\u00edo y el bajo contenido en azufre (normalmente &lt;0,005%) evitan la aparici\u00f3n de \u201cporos\u201d y \u201ccolas de cometa\u201d durante el pulido con diamante.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Texturizado:<\/span><\/strong><span class=\"ng-star-inserted\"> La estructura granular uniforme garantiza un rendimiento constante en el grabado al \u00e1cido. Las texturas quedan n\u00edtidas y uniformes, sin las rayas que se observan en los aceros de menor calidad.<\/span><\/p>\n<\/li>\n<\/ul>\n<hr class=\"ng-star-inserted\" \/>\n<h2 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">\u00bfCu\u00e1les son las aplicaciones t\u00edpicas en ingenier\u00eda?<\/span><\/h2>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">El acero 718 es el material por excelencia para aplicaciones en las que se combinan el tama\u00f1o, la tenacidad y el acabado.<\/span><\/p>\n<ol class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Moldes grandes para inyecci\u00f3n de pl\u00e1stico:<\/span><\/strong><\/p>\n<ul class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Parachoques, salpicaderos y paneles de las puertas de los veh\u00edculos.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Carcasas de televisores y de electrodom\u00e9sticos de gran tama\u00f1o (lavadoras, aparatos de aire acondicionado).<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">\u00bfPor qu\u00e9?<\/span><span class=\"ng-star-inserted\"> Solo el 718 garantiza la dureza en el centro de estos enormes bloques.<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Piezas cosm\u00e9ticas de alto brillo:<\/span><\/strong><\/p>\n<ul class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Carcasas de aparatos electr\u00f3nicos de consumo, consolas de videojuegos.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">\u00bfPor qu\u00e9?<\/span><span class=\"ng-star-inserted\"> Se necesita un pulimento mejor que el P20, pero m\u00e1s barato que el NAK80.<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Moldes de compresi\u00f3n:<\/span><\/strong><\/p>\n<ul class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Moldes de caucho y SMC (compuesto de moldeo en l\u00e1minas).<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Bases de los moldes:<\/span><\/strong><\/p>\n<ul class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">En el caso de moldes que requieren una precisi\u00f3n extremadamente alta, en los que el acero estructural est\u00e1ndar (S50C) resulta demasiado blando o inestable, se utiliza el acero 718 para las placas base del molde con el fin de garantizar su rigidez.<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<hr class=\"ng-star-inserted\" \/>\n<h2 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">El acero 718 frente a otros aceros para moldes: una matriz de decisi\u00f3n<\/span><\/h2>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">La elecci\u00f3n del acero adecuado para moldes supone un an\u00e1lisis de compensaciones. A continuaci\u00f3n se muestra una comparaci\u00f3n entre el 718 y sus principales competidores.<\/span><\/p>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">718 frente a P20 (1,2311)<\/span><\/h3>\n<ul class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Diferencia:<\/span><\/strong><span class=\"ng-star-inserted\"> El P20 no contiene n\u00edquel.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Rendimiento:<\/span><\/strong><span class=\"ng-star-inserted\"> El P20 pierde dureza en el centro de los bloques de m\u00e1s de 100-200 mm de grosor. El 718 mantiene la dureza hasta m\u00e1s de 400 mm.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Selecci\u00f3n:<\/span><\/strong><span class=\"ng-star-inserted\"> Utiliza el P20 para moldes peque\u00f1os y no cr\u00edticos, a fin de ahorrar dinero. Utiliza el 718 para moldes grandes o piezas que requieran un acabado texturizado o pulido uniforme.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">718 contra NAK80<\/span><\/h3>\n<ul class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Diferencia:<\/span><\/strong><span class=\"ng-star-inserted\"> El NAK80 es un acero de endurecimiento por precipitaci\u00f3n (40 HRC) que resulta a\u00fan m\u00e1s puro y m\u00e1s duro.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Rendimiento:<\/span><\/strong><span class=\"ng-star-inserted\"> El NAK80 ofrece un acabado espejo de calidad superior (grado \u00f3ptico), pero es m\u00e1s dif\u00edcil de mecanizar y considerablemente m\u00e1s caro.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Selecci\u00f3n:<\/span><\/strong><span class=\"ng-star-inserted\"> Utiliza NAK80 para insertos peque\u00f1os de calidad \u00f3ptica (lentes). Utiliza 718 para el cuerpo principal del molde o para carcasas m\u00e1s grandes en las que no se requiera claridad \u00f3ptica.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">718 frente a S136 (acero inoxidable 420)<\/span><\/h3>\n<ul class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Diferencia:<\/span><\/strong><span class=\"ng-star-inserted\"> El S136 es de acero inoxidable; el 718 no lo es.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Rendimiento:<\/span><\/strong><span class=\"ng-star-inserted\"> El 718 se oxida si se expone a la humedad o a pl\u00e1sticos corrosivos (PVC). El S136 es resistente a la corrosi\u00f3n.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Selecci\u00f3n:<\/span><\/strong><span class=\"ng-star-inserted\"> Utiliza el S136 para moldes m\u00e9dicos, alimentarios o de PVC. Utiliza el 718 para pl\u00e1sticos generales (ABS, PP, PE) en los que la corrosi\u00f3n no suponga un riesgo importante.<\/span><\/p>\n<\/li>\n<\/ul>\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Tabla 4: Matriz comparativa de aceros para moldes<\/span><\/strong><\/p>\n<div class=\"table-container ng-star-inserted\">\n<table>\n<tbody>\n<tr class=\"table-header ng-star-inserted\">\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Caracter\u00edstica<\/span><\/td>\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">718 (1.2738)<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">P20 (1,2311)<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">NAK80<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">S136<\/span><\/strong><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Dureza (HRC)<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">30 \u2013 38<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">28 \u2013 32<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">37 \u2013 43<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">48 \u2013 52 (tras el descanso)<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Capacidad de temple completo<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Excelente<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Deficiente (secciones gruesas)<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Excelente<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Bien<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Capacidad de pulido<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Muy bien<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Bien<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Lo mejor (Mirror)<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Lo mejor (Mirror)<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Resistencia a la corrosi\u00f3n<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Bajo<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Bajo<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Bajo<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Alto (acero inoxidable)<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Maquinabilidad<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Bien<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Excelente<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Feria<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Feria<\/span><\/td>\n<\/tr>\n<tr class=\"ng-star-inserted\">\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Coste<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Medio<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Bajo<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Alta<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Alta<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<hr class=\"ng-star-inserted\" \/>\n<h2 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">\u00bfCu\u00e1les son las limitaciones y los modos de fallo?<\/span><\/h2>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">A pesar de su versatilidad, el acero 718 presenta claras limitaciones t\u00e9cnicas.<\/span><\/p>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">1. No es resistente a la corrosi\u00f3n<\/span><\/h3>\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">El 718 no es acero inoxidable.<\/span><\/strong><\/p>\n<ul class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Riesgo:<\/span><\/strong><span class=\"ng-star-inserted\"> Si se moldean pl\u00e1sticos corrosivos como el PVC (que libera \u00e1cido clorh\u00eddrico) o el POM, o si se trabaja en un entorno h\u00famedo, el 718 se oxida. Esto estropea las superficies pulidas y provoca problemas de expulsi\u00f3n de las piezas.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Soluci\u00f3n:<\/span><\/strong><span class=\"ng-star-inserted\"> Cromar la cavidad del molde o pasar a utilizar S136.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">2. No apto para desgaste por abrasi\u00f3n<\/span><\/h3>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Aunque es resistente, el 38 HRC es relativamente blando en comparaci\u00f3n con los aceros para herramientas templados (50+ HRC).<\/span><\/p>\n<ul class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Riesgo:<\/span><\/strong><span class=\"ng-star-inserted\"> El moldeo de materiales reforzados con fibra de vidrio (por ejemplo, PA66 + 30% GF) provoca que las zonas de entrada y las texturas se desgasten r\u00e1pidamente.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Soluci\u00f3n:<\/span><\/strong><span class=\"ng-star-inserted\"> Utiliza insertos endurecidos H13 en las zonas de mayor desgaste de una base de molde 718.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">3. Problemas relacionados con la soldabilidad<\/span><\/h3>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">La soldadura del 718 para reparaciones (por ejemplo, para corregir un error de mecanizado o una zona con rebaba) requiere protocolos estrictos.<\/span><\/p>\n<ul class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Riesgo:<\/span><\/strong><span class=\"ng-star-inserted\"> La zona de soldadura puede endurecerse de forma diferente al metal base, dejando una \u201cl\u00ednea fantasma\u201d o una marca visible tras el texturizado o el pulido.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Soluci\u00f3n:<\/span><\/strong><span class=\"ng-star-inserted\"> Utiliza varillas de relleno qu\u00edmico adecuadas, precalienta el molde y realiza un recocido posterior a la soldadura.<\/span><\/p>\n<\/li>\n<\/ul>\n<hr class=\"ng-star-inserted\" \/>\n<h2 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Resumen \u2014 Conclusiones t\u00e9cnicas sobre el acero 718<\/span><\/h2>\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Acero 718<\/span><\/strong><span class=\"ng-star-inserted\"> es la columna vertebral de la industria del moldeo de pl\u00e1stico a gran escala. Resuelve el problema fundamental de garantizar una dureza uniforme en el interior de bloques de acero de gran tama\u00f1o, algo que el P20 est\u00e1ndar no puede igualar.<\/span><\/p>\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Recomendaciones clave:<\/span><\/strong><\/p>\n<ol class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Selecciona 718<\/span><\/strong><span class=\"ng-star-inserted\"> para moldes de tama\u00f1o mediano a grande (parachoques de autom\u00f3viles, carcasas de electrodom\u00e9sticos) en los que la estabilidad dimensional y la resistencia son fundamentales.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Actualizaci\u00f3n desde el P20<\/span><\/strong><span class=\"ng-star-inserted\"> si necesitas un pulido de alto brillo o una textura uniforme mediante fotograbado.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">No lo vuelvas a endurecer.<\/span><\/strong><span class=\"ng-star-inserted\"> Utiliza el material en su estado preendurecido para garantizar la precisi\u00f3n dimensional.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Presta atenci\u00f3n al medio ambiente.<\/span><\/strong><span class=\"ng-star-inserted\"> Si la corrosi\u00f3n (PVC\/humedad) o la abrasi\u00f3n (fibra de vidrio) son factores a tener en cuenta, recubra el molde o utilice aceros inoxidables o para herramientas espec\u00edficos.<\/span><\/p>\n<\/li>\n<\/ol>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Al adaptar la elecci\u00f3n del material a los requisitos espec\u00edficos del tama\u00f1o del molde y de la resina pl\u00e1stica, los ingenieros pueden aprovechar las ventajas del acero 718 para reducir los plazos de entrega y garantizar una calidad constante de las piezas.<\/span><\/p>\n<hr class=\"ng-star-inserted\" \/>\n<h2 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">FAQ<\/span><\/h2>\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">P: \u00bfEl acero 718 es lo mismo que el Inconel 718?<\/span><\/strong><br class=\"ng-star-inserted\" \/><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">R:<\/span><\/strong> <strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">No.<\/span><\/strong><span class=\"ng-star-inserted\"> El Inconel 718 es una superaleaci\u00f3n a base de n\u00edquel para motores a reacci\u00f3n, cuyo coste es 20 veces superior. El \u201cacero para moldes 718\u201d es un acero para herramientas de baja aleaci\u00f3n (DIN 1.2738). Comparten el n\u00famero, pero nada m\u00e1s.<\/span><\/p>\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">P: \u00bfSe puede pulir el acero 718 hasta conseguir un acabado de espejo?<\/span><\/strong><br class=\"ng-star-inserted\" \/><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">R:<\/span><\/strong> <strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">S\u00ed.<\/span><\/strong><span class=\"ng-star-inserted\"> Permite obtener un acabado de alto brillo (aprox. SPI A2). Aunque no es de \u201ccalidad \u00f3ptica\u201d como el NAK80 o el S136, resulta suficiente para la mayor\u00eda de las piezas de consumo con acabado brillante.<\/span><\/p>\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">P: \u00bfSe oxida el acero 718?<\/span><\/strong><br class=\"ng-star-inserted\" \/><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">R:<\/span><\/strong> <strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">S\u00ed.<\/span><\/strong><span class=\"ng-star-inserted\"> Contiene muy poco cromo. Requiere productos anticorrosivos durante el almacenamiento y debe mantenerse seco. Los canales de refrigeraci\u00f3n deben tratarse para evitar la oxidaci\u00f3n interna.<\/span><\/p>\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">P: \u00bfCu\u00e1l es la diferencia entre el 718 y el 718H?<\/span><\/strong><br class=\"ng-star-inserted\" \/><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">R:<\/span><\/strong> <strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">718H<\/span><\/strong><span class=\"ng-star-inserted\"> Es simplemente una variante sometida a un tratamiento t\u00e9rmico para alcanzar un rango de dureza ligeramente superior (normalmente entre 34 y 38 HRC) en comparaci\u00f3n con el 718 est\u00e1ndar (entre 30 y 34 HRC). La \u201cH\u201d significa \u00abHard\u00bb (duro). El 718H ofrece una resistencia al desgaste y una capacidad de pulido ligeramente mejores.<\/span><\/p>\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">P: \u00bfEs el 718 adecuado para moldes de fundici\u00f3n a presi\u00f3n?<\/span><\/strong><br class=\"ng-star-inserted\" \/><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">R:<\/span><\/strong> <strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">No.<\/span><\/strong><span class=\"ng-star-inserted\"> El 718 no resiste el choque t\u00e9rmico del aluminio o el zinc fundidos (fundici\u00f3n a presi\u00f3n). Para la fundici\u00f3n a presi\u00f3n, utiliza <\/span><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">H13 (SKD61)<\/span><\/strong><span class=\"ng-star-inserted\"> acero para herramientas de trabajo en caliente.<\/span><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>El acero 718 es una aleaci\u00f3n de acero preendurecido que se utiliza a menudo para fabricar moldes de inyecci\u00f3n de pl\u00e1stico, especialmente para moldes grandes y medianos que deben ser fuertes, resistentes y de tama\u00f1o estable.<\/p>","protected":false},"author":1,"featured_media":9802,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[103],"tags":[],"class_list":["post-9710","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-materials-guide"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.5 (Yoast SEO v28.7) - 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