{"id":9740,"date":"2026-01-10T17:28:29","date_gmt":"2026-01-10T09:28:29","guid":{"rendered":"https:\/\/www.cncmachiningshops.com\/?p=9740"},"modified":"2026-01-05T13:03:08","modified_gmt":"2026-01-05T05:03:08","slug":"grade-2-titanium","status":"publish","type":"post","link":"https:\/\/www.cncmachiningshops.com\/fr\/grade-2-titanium\/","title":{"rendered":"Tout savoir sur le titane de grade 2 : propri\u00e9t\u00e9s, applications, usinage et consignes de conception"},"content":{"rendered":"<div data-page-id=\"SLAQdLOx4oxYa6xfGYdcJBbqnUe\" data-lark-html-role=\"root\" data-docx-has-block-data=\"true\">\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">La nuance la plus courante de titane commercialement pur (CP) est le titane de nuance 2, souvent qualifi\u00e9 de \u201c cheval de bataille \u201d de l\u2019industrie du titane. Il doit ce titre non pas \u00e0 l\u2019excellence de l\u2019une de ses caract\u00e9ristiques prises isol\u00e9ment, mais au fait qu\u2019il offre le meilleur \u00e9quilibre technique entre r\u00e9sistance m\u00e9canique, r\u00e9sistance \u00e0 la corrosion, formabilit\u00e9 et facilit\u00e9 de fabrication. Dans la conception concr\u00e8te des pi\u00e8ces, cet \u00e9quilibre est souvent plus important que les meilleures performances m\u00e9caniques offertes par des alliages plus exotiques.<\/span><\/p>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">D\u2019un point de vue technique, le titane de grade 2 constitue le meilleur choix lorsque l\u2019on a besoin d\u2019une r\u00e9sistance \u00e0 la corrosion fiable sans pour autant vouloir y consacrer un budget \u00e9lev\u00e9, sans rencontrer de difficult\u00e9s d\u2019usinage et sans renoncer \u00e0 la t\u00e9nacit\u00e9. Le grade 2 offre le meilleur compromis fonctionnel entre la mall\u00e9abilit\u00e9 du grade 1 et la r\u00e9sistance m\u00e9canique sup\u00e9rieure des grades 3 et 4. Il pr\u00e9sente une r\u00e9sistance \u00e0 la traction minimale de 345 MPa et est tr\u00e8s ductile. Cet article propose une analyse technique compl\u00e8te du titane de grade 2, indiquant aux ing\u00e9nieurs et aux responsables des achats dans quels cas choisir ce mat\u00e9riau polyvalent et comment tirer le meilleur parti de son usinage pour une utilisation industrielle.<\/span><\/p>\n<h2 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Qu'est-ce que le titane de grade 2 ? Normes et classification<\/span><\/h2>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Le \u201c cheval de bataille \u201d du titane commercialement pur<\/span><\/h3>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Le titane commercialement pur (CP) correspond au titane de grade 2. Ses propri\u00e9t\u00e9s sont d\u00e9termin\u00e9es par des niveaux contr\u00f4l\u00e9s d'impuret\u00e9s, et non par l'ajout d'\u00e9l\u00e9ments tels que l'aluminium ou le vanadium \u00e0 l'alliage. Il s'agit de la norme industrielle pour les applications o\u00f9 la corrosion est un enjeu majeur, car il pr\u00e9sente une r\u00e9sistance mod\u00e9r\u00e9e et est facile \u00e0 fa\u00e7onner.<\/span><\/p>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Pour bien comprendre la classe 2, il est essentiel de la replacer dans le cadre de la gamme CP Titanium, o\u00f9 les principaux facteurs de diff\u00e9renciation sont la teneur en oxyg\u00e8ne (O) et en fer (Fe) :<\/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\">Niveau 1 (faible teneur en oxyg\u00e8ne) :<\/span><\/strong><span class=\"ng-star-inserted\"> Ductilit\u00e9 maximale et r\u00e9sistance minimale. Utilis\u00e9 pour l'emboutissage profond.<\/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\">Niveau 2 (teneur moyenne en oxyg\u00e8ne) :<\/span><\/strong><span class=\"ng-star-inserted\"> La norme d'\u00e9quilibre. Suffisamment r\u00e9sistante pour les r\u00e9cipients sous pression et suffisamment souple pour le formage \u00e0 froid.<\/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\">Niveaux 3 et 4 (forte teneur en oxyg\u00e8ne) :<\/span><\/strong><span class=\"ng-star-inserted\"> Plus r\u00e9sistant, mais moins mall\u00e9able. Utilis\u00e9 pour les raccords et la quincaillerie qui doivent pr\u00e9senter une grande r\u00e9sistance.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">D\u00e9nominations et normes \u00e0 travers le monde<\/span><\/h3>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Pour s'assurer que les mat\u00e9riaux fonctionnent correctement, il est tr\u00e8s important de faire preuve de pr\u00e9cision lors de leur achat. Il existe certaines appellations utilis\u00e9es dans le monde entier pour d\u00e9signer le titane de grade 2 :<\/span><\/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\">Syst\u00e8me standard<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Champ d'application du produit<\/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\">UNS<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Le code R50400 est le principal identifiant des bases de donn\u00e9es en Am\u00e9rique du Nord.<\/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\">ASTM<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Les normes B265, B348 et B338 s'appliquent respectivement aux t\u00f4les et plaques, aux barres et billettes, ainsi qu'aux tubes et tuyaux.<\/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\">ASME<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Mat\u00e9riau conforme \u00e0 la norme ASME SB-265 \u00ab Code des chaudi\u00e8res et des appareils sous pression \u00bb (BPVC).<\/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\">ISO<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">5832-2 : Norme relative \u00e0 l'\u00e9quivalence chimique des implants m\u00e9dicaux.<\/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\">DIN<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">La norme 3.7035 est une norme industrielle allemande.<\/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\">Conseil technique :<\/span><\/strong><span class=\"ng-star-inserted\"> Veillez \u00e0 toujours indiquer \u00e0 la fois la nuance et la norme sur les plans techniques. Par exemple : \u201c Titane nuance 2 selon la norme ASTM B265 \u201d. Cela permet de pr\u00e9ciser clairement les limites en mati\u00e8re d\u2019impuret\u00e9s ainsi que les exigences relatives aux essais m\u00e9caniques.<\/span><\/p>\n<h2 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">En quoi la composition chimique influe-t-elle sur les performances ?<\/span><\/h2>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Les \u00e9l\u00e9ments ajout\u00e9s au titane de grade 2 ont moins d'influence sur son comportement technique que ceux dont la teneur est contr\u00f4l\u00e9e. C'est en effet la gestion rigoureuse des \u00e9l\u00e9ments interstitiels qui d\u00e9termine ses propri\u00e9t\u00e9s m\u00e9caniques.<\/span><\/p>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Limites relatives \u00e0 la composition chimique (wt.%)<\/span><\/h3>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">En CE1, on utilise des limites maximales plut\u00f4t que des fourchettes cibles. Les points les plus importants sont les suivants :<\/span><\/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\">\u00c9l\u00e9ment<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Limite (poids max. : %)<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Cons\u00e9quences sur l'ing\u00e9nierie<\/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\">Titane (Ti)<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Solde (\u2265 99,21 TP17T)<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">La matrice. Elle pr\u00e9sente une faible densit\u00e9 et r\u00e9siste \u00e0 la corrosion.<\/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\">Oxyg\u00e8ne (O)<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\">\n<pre><span style=\"font-family: inherit; font-size: inherit;\">\u22640,25%<\/span><\/pre>\n<\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">C'est ce qui le rend plus r\u00e9sistant. Cela conf\u00e8re de la r\u00e9sistance au mat\u00e9riau sans le rendre cassant.<\/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\">Fer (Fe)<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\">\n<pre><span style=\"font-family: inherit; font-size: inherit;\">\u22640,30%<\/span><\/pre>\n<\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Un stabilisateur b\u00eata. Des taux de fer trop \u00e9lev\u00e9s r\u00e9duisent la r\u00e9sistance \u00e0 la corrosion, tandis que des taux ad\u00e9quats renforcent la r\u00e9sistance.<\/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\">Azote (N)<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\">\n<pre><span style=\"font-family: inherit; font-size: inherit;\">\u2264 0,031 TP17T<\/span><\/pre>\n<\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Si on ne le ma\u00eetrise pas, cela complique les choses, mais les rend aussi beaucoup moins ductiles.<\/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\">Carbone (C)<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\">\n<pre><span style=\"font-family: inherit; font-size: inherit;\">\u22640,08%<\/span><\/pre>\n<\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">On l'a maintenu \u00e0 un niveau bas pour que ce soit plus difficile.<\/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\">Hydrog\u00e8ne (H)<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\">\n<pre><span style=\"font-family: inherit; font-size: inherit;\">\u2264 0,0151 TP17T<\/span><\/pre>\n<\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Des limites tr\u00e8s strictes pour emp\u00eacher la fragilisation par l'hydrog\u00e8ne.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Le r\u00f4le du fer et de l'oxyg\u00e8ne<\/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\">L'oxyg\u00e8ne comme agent fortifiant :<\/span><\/strong><span class=\"ng-star-inserted\"> Les atomes d'oxyg\u00e8ne se logent dans les interstices du r\u00e9seau cristallin du titane alpha, ce qui provoque une l\u00e9g\u00e8re d\u00e9formation de celui-ci et emp\u00eache le mouvement des dislocations. Ce renforcement par solution solide conf\u00e8re \u00e0 la nuance 2 une r\u00e9sistance \u00e0 la traction de 345 MPa (contre 240 MPa pour la nuance 1).<\/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\">Microstructure :<\/span><\/strong><span class=\"ng-star-inserted\"> Le niveau 2 comporte une phase Alpha (\u03b1<\/span>) et une structure cristalline hexagonale compacte (HCP). Cette structure reste stable \u00e0 toutes les temp\u00e9ratures de fonctionnement, ce qui signifie qu'il n'y a pas de changements de phase pendant le soudage. C'est l'une des principales raisons pour lesquelles ce mat\u00e9riau est si facile \u00e0 souder.<\/p>\n<p>&nbsp;<\/li>\n<\/ul>\n<h2 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Quelles sont les propri\u00e9t\u00e9s m\u00e9caniques les plus importantes ?<\/span><\/h2>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Le titane de grade 2 est choisi pour sa fiabilit\u00e9, et non pour sa grande r\u00e9sistance. Ses propri\u00e9t\u00e9s m\u00e9caniques permettent de maintenir l'int\u00e9grit\u00e9 des pi\u00e8ces soumises \u00e0 la pression tout en facilitant leur usinage.<\/span><\/p>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Propri\u00e9t\u00e9s m\u00e9caniques courantes \u00e0 temp\u00e9rature ambiante<\/span><\/h3>\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\">Propri\u00e9t\u00e9<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Valeur m\u00e9trique<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Valeur imp\u00e9riale<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Importance sur le plan technique<\/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\">R\u00e9sistance \u00e0 la traction<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">345 MPa (minimum)<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">50 ksi<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Cela suffit pour les tuyaux et les r\u00e9servoirs classiques.<\/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\">Limite d'\u00e9lasticit\u00e9 (0,2%)<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">275 \u00e0 450 MPa<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">40 \u00e0 65 ksi<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">D\u00e9finir la limite \u00e9lastique pour la conception des structures.<\/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\">\u00c9longation<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\">\n<pre><span style=\"font-family: inherit; font-size: inherit;\">\u226520%<\/span><\/pre>\n<\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">\u2013<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Bonne formabilit\u00e9 \u00e0 froid ; r\u00e9siste \u00e0 la fissuration lors du pliage.<\/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\">Duret\u00e9<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">160 \u00e0 200 HV<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">entre 80 et 90 HRB environ<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">La surface est moyennement dure ; il faut donc veiller \u00e0 ne pas l'ab\u00eemer.<\/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\">Module d'\u00e9lasticit\u00e9<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">105 GPa<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">15,2 Msi<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">C'est un mat\u00e9riau souple. Sa rigidit\u00e9 est deux fois moins \u00e9lev\u00e9e que celle de l'acier ; il est donc tr\u00e8s important de tenir compte de la d\u00e9formation lors de la conception.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Avantage du rapport r\u00e9sistance\/poids<\/span><\/h3>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">La nuance 2 n'est pas aussi r\u00e9sistante que la nuance 5, mais sa densit\u00e9 est inf\u00e9rieure d'environ 45% \u00e0 celle de l'acier inoxydable (4,51 g\/cm\u00b3).<\/span><\/p>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Une pi\u00e8ce en Grade 2 peut \u00eatre tout aussi r\u00e9sistante qu'une pi\u00e8ce en acier inoxydable 316L, tout en pesant pr\u00e8s de deux fois moins lourd. Elle est donc id\u00e9ale pour les structures qui doivent \u00eatre \u00e0 la fois l\u00e9g\u00e8res et r\u00e9sistantes, comme celles situ\u00e9es sur l'eau ou en mer.<\/span><\/p>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Comment g\u00e9rer la fatigue<\/span><\/h3>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">La nuance 2 pr\u00e9sente une limite claire quant \u00e0 sa dur\u00e9e de vie, ce qui la distingue de l'aluminium. La r\u00e9sistance \u00e0 la fatigue correspond g\u00e9n\u00e9ralement \u00e0 environ la moiti\u00e9 de la r\u00e9sistance \u00e0 la traction.<\/span><\/p>\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Note de conception :<\/span><\/strong><span class=\"ng-star-inserted\"> La finition de surface a une grande influence sur la r\u00e9sistance du titane CP aux contraintes, car ce mat\u00e9riau est sensible aux entailles. Les surfaces polies r\u00e9sistent bien mieux que les surfaces usin\u00e9es de mani\u00e8re rugueuse lorsqu'elles sont soumises \u00e0 des charges cycliques.<\/span><\/p>\n<h2 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">R\u00e9sistance \u00e0 la corrosion : la principale raison de ce choix<\/span><\/h2>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">La raison la plus convaincante de choisir le titane de grade 2 est qu\u2019il ne se corrode pas dans des conditions difficiles. Il ne d\u00e9pend pas de placages ou de rev\u00eatements susceptibles de s\u2019user.<\/span><\/p>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Le m\u00e9canisme de formation d'un film d'oxyde passif<\/span><\/h3>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Au contact de l'oxyg\u00e8ne, le Grade 2 se transforme instantan\u00e9ment en une forme stable et r\u00e9sistante de dioxyde de titane (<span class=\"mord mathnormal\">T<\/span><span class=\"mord mathnormal\">i<\/span><span class=\"mord\"><span class=\"mord mathnormal\">O<\/span><span class=\"msupsub\"><span class=\"vlist-t vlist-t2\"><span class=\"vlist-r\"><span class=\"vlist\"><span class=\"\"><span class=\"sizing reset-size6 size3 mtight\"><span class=\"mord mtight\">2<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><span class=\"ng-star-inserted\">) film.<\/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\">Auto-gu\u00e9rison :<\/span><\/strong><span class=\"ng-star-inserted\"> Le film se reforme rapidement d\u00e8s qu'il y a un peu d'humidit\u00e9 ou d'oxyg\u00e8ne \u00e0 la surface.<\/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\">Stabilit\u00e9 :<\/span><\/strong><span class=\"ng-star-inserted\"> Cette couche d'oxyde est chimiquement stable sur une large plage de valeurs de pH, ce qui signifie qu'elle ne se d\u00e9grade pas et ne provoque pas de piq\u00fbres dans les aciers inoxydables.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Performance dans le domaine de l'environnement<\/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\">Eau de mer et atmosph\u00e8res marines :<\/span><\/strong><span class=\"ng-star-inserted\"> L'acier de nuance 2 est pratiquement totalement r\u00e9sistant \u00e0 la corrosion g\u00e9n\u00e9rale et \u00e0 la corrosion par piq\u00fbres dans l'eau de mer \u00e0 des temp\u00e9ratures pouvant atteindre 260 \u00b0C (500 \u00b0F). Il s'agit du mat\u00e9riau le plus couramment utilis\u00e9 dans les \u00e9changeurs de chaleur destin\u00e9s au dessalement.<\/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\">Chlorures et eau de Javel :<\/span><\/strong><span class=\"ng-star-inserted\"> Tr\u00e8s r\u00e9sistant au chlore gazeux humide, aux hypochlorites et aux solutions de saumure.<\/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\">Acides :<\/span><\/strong><span class=\"ng-star-inserted\"> Tr\u00e8s efficace pour d\u00e9composer les acides tels que l'acide nitrique et l'acide chromique.<\/span><\/p>\n<ul class=\"ng-star-inserted\">\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Attention :<\/span><span class=\"ng-star-inserted\"> La corrosion peut se produire rapidement lorsque des acides sont introduits (comme l'acide chlorhydrique et l'acide sulfurique). Ces milieux n\u00e9cessitent l'ajout d'inhibiteurs ou l'utilisation d'alliages (grade 7).<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Fabrication : usinage, formage et soudage<\/span><\/h2>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Par rapport aux alliages de titane, le titane de grade 2 est \u201c facile \u00e0 usiner \u201d, mais il n\u00e9cessite des contr\u00f4les de processus diff\u00e9rents de ceux de l'acier ou de l'aluminium.<\/span><\/p>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">R\u00e8gles relatives \u00e0 l'usinage CNC<\/span><\/h3>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Le grade 2 est plus facile \u00e0 usiner que le grade 5, mais il est plus difficile \u00e0 travailler car il conduit mal la chaleur et a tendance \u00e0 se gripper.<\/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\">G\u00e9rer la chaleur :<\/span><\/strong><span class=\"ng-star-inserted\"> Le titane ne dissipe pas la chaleur de la zone de coupe. C'est au niveau de l'ar\u00eate de l'outil que la chaleur s'accumule. Pour rem\u00e9dier \u00e0 ce probl\u00e8me, utilisez un liquide de refroidissement \u00e0 haute pression en jet diffus. Les angles de coupe positifs sur les outils en carbure permettent de r\u00e9duire les forces de coupe.<\/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\">Vitesse et avance :<\/span><\/strong><span class=\"ng-star-inserted\"> Pour \u00e9viter que la pi\u00e8ce ne durcisse, travaillez \u00e0 des vitesses de surface r\u00e9duites (environ 45 \u00e0 60 m\/min) avec des avances assez importantes. Ne laissez pas l'outil au repos ; il doit \u00eatre en coupe en permanence.<\/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\">Outils :<\/span><\/strong><span class=\"ng-star-inserted\"> Utilisez des outils bien aff\u00fbt\u00e9s et adapt\u00e9s \u00e0 l'usage pr\u00e9vu. Les outils \u00e9mouss\u00e9s provoquent imm\u00e9diatement un durcissement par d\u00e9formation et peuvent entra\u00eener une d\u00e9faillance catastrophique.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Fabrication et cintrage<\/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\">Formage \u00e0 froid :<\/span><\/strong><span class=\"ng-star-inserted\"> La nuance 2 offre une grande flexibilit\u00e9 et peut \u00eatre \u00e9tir\u00e9e jusqu'\u00e0 20%. Elle permet aussi bien le cintrage \u00e0 froid que l'emboutissage peu profond.<\/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\">Retour \u00e9lastique :<\/span><\/strong><span class=\"ng-star-inserted\"> L'acier de nuance 2 pr\u00e9sente un fort retour \u00e9lastique en raison de son faible module (105 GPa). Pour compenser cela, les matrices doivent \u00eatre cintr\u00e9es davantage que celles en acier, g\u00e9n\u00e9ralement de 15\u00b0 \u00e0 25\u00b0.<\/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\">Lubrification :<\/span><\/strong><span class=\"ng-star-inserted\"> Pour \u00e9viter que les matrices ne s'ab\u00eement, il faut utiliser des lubrifiants tr\u00e8s r\u00e9sistants, comme le bisulfure de molybd\u00e8ne ou un produit similaire.<\/span><\/p>\n<\/li>\n<\/ul>\n<h3 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Caract\u00e9ristiques du soudage<\/span><\/h3>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">La classe 2 obtient la mention \u00ab Excellent \u00bb pour le soudage (TIG\/GTAW, laser, plasma).<\/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 r\u00e8gle d'or :<\/span><\/strong><span class=\"ng-star-inserted\"> La protection est essentielle. Lorsque le titane est fondu, il absorbe rapidement l'oxyg\u00e8ne et l'azote, ce qui le rend cassant. Pour prot\u00e9ger le bain de fusion, la zone affect\u00e9e thermiquement (HAZ) et le c\u00f4t\u00e9 racine (purge arri\u00e8re) jusqu'\u00e0 ce que le m\u00e9tal refroidisse en dessous de 427 \u00b0C (800 \u00b0F), vous avez besoin d'argon pur (99,999%).<\/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\">R\u00e9sultat :<\/span><\/strong><span class=\"ng-star-inserted\"> Une soudure correctement prot\u00e9g\u00e9e pr\u00e9serve la ductilit\u00e9 et la r\u00e9sistance \u00e0 la corrosion du m\u00e9tal de base. Si la couleur vire au jaune paille, au bleu ou au violet, cela signifie que le mat\u00e9riau est contamin\u00e9.<\/span><\/p>\n<\/li>\n<\/ul>\n<h2 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Comparaison des caract\u00e9ristiques techniques entre le titane de grade 2 et celui de grade 5<\/span><\/h2>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Les ing\u00e9nieurs ont souvent du mal \u00e0 choisir entre le \u201c Workhorse \u201d (classe 2) et l\u201c\u201d Ace \u00bb (classe 5 \/ Ti-6Al-4V). C\u2019est la contrainte de conception principale qui d\u00e9termine ce choix.<\/span><\/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\">Fonctionnalit\u00e9<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Grade 2 (CP Ti)<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Grade 5 (Ti-6Al-4V)<\/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\">Type<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Pure sur le plan commercial (Alpha)<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Alliage alpha-b\u00eata<\/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\">Limite d'\u00e9lasticit\u00e9<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">environ 275 \u00e0 450 MPa<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">~880 MPa<\/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\">Ductilit\u00e9<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">\u00c9lev\u00e9 (&gt;20%)<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Pas beaucoup (&lt;14%)<\/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\">Corrosion<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Meilleur (notamment dans les acides)<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Bon (pour un usage g\u00e9n\u00e9ral)<\/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\">Usinabilit\u00e9<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Gummy, il faut qu'il apprenne \u00e0 se mod\u00e9rer sur les chips<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Dur, ce qui entra\u00eene une usure plus importante des outils<\/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\">Co\u00fbt<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Moyen<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">\u00c9lev\u00e9<\/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\">Principales utilisations<\/span><\/strong><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Tuyauteries, cuves, \u00e9changeurs de chaleur<\/span><\/td>\n<td class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Structures a\u00e9rospatiales, \u00e9l\u00e9ments de fixation<\/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\">Crit\u00e8res de s\u00e9lection :<\/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\">Choisir <\/span><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Niveau 2<\/span><\/strong><span class=\"ng-star-inserted\"> si la pi\u00e8ce n\u00e9cessite un soudage, un formage \u00e0 froid important ou une r\u00e9sistance optimale \u00e0 la corrosion dans des environnements chimiques ou marins.<\/span><\/p>\n<\/li>\n<li class=\"ng-star-inserted\">\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Si l'objectif principal est d'obtenir un rapport r\u00e9sistance\/poids \u00e9lev\u00e9 ou une r\u00e9sistance \u00e0 la fatigue \u00e0 haut nombre de cycles, et que le formage ou le soudage ne rev\u00eatent pas une grande importance, choisissez <\/span><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">5e ann\u00e9e<\/span><\/strong><span class=\"ng-star-inserted\">.<\/span><\/p>\n<\/li>\n<\/ul>\n<h2 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Utilisations courantes du titane de grade 2 dans l'industrie<\/span><\/h2>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Le titane de grade 2 est utilis\u00e9 dans de nombreux secteurs o\u00f9 la maintenance est difficile et o\u00f9 une d\u00e9faillance co\u00fbterait cher.<\/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\">Industrie chimique et p\u00e9trochimique<\/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\">Les cuves de r\u00e9action, les colonnes de distillation et les canalisations de transfert en font tous partie.<\/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\">Pourquoi le CE1 ?<\/span><\/strong><span class=\"ng-star-inserted\"> Il r\u00e9siste aux substances oxydantes agressives (comme le chlore humide) qui attaquent rapidement l'acier inoxydable, garantissant ainsi un confinement s\u00fbr des fluides dangereux.<\/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\">Produire de l'\u00e9lectricit\u00e9 et \u00e9liminer le sel<\/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\">Pi\u00e8ces :<\/span><\/strong><span class=\"ng-star-inserted\"> \u00c9changeurs de chaleur \u00e0 plaques et cadres et \u00e0 tubes de condenseur.<\/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\">Pourquoi le CE1 ?<\/span><\/strong><span class=\"ng-star-inserted\"> Sa conception \u00e0 paroi mince (qui emp\u00eache toute corrosion) en fait le meilleur conducteur de chaleur, et il durera des d\u00e9cennies car il n'est pas affect\u00e9 par l'eau de mer.<\/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\">Mat\u00e9riel pour bateaux<\/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\">Les pi\u00e8ces comprennent :<\/span><\/strong><span class=\"ng-star-inserted\"> Robinets \u00e0 boisseau sph\u00e9rique, pompes \u00e0 incendie, \u00e9quipements de coque et arbres d'h\u00e9lice.<\/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\">Pourquoi le CE1 ?<\/span><\/strong><span class=\"ng-star-inserted\"> Cela permet de se passer d'anodes sacrificielles ou de rev\u00eatements protecteurs, ce qui r\u00e9duit les co\u00fbts d'entretien des plateformes offshore et des navires de guerre tout au long de leur dur\u00e9e de vie.<\/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\">Anodes \u00e0 stabilit\u00e9 dimensionnelle (DSA)<\/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\">Utilisation :<\/span><\/strong><span class=\"ng-star-inserted\"> \u00c9lectrolyse et galvanoplastie.<\/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\">Pourquoi une note de 2 ?<\/span><\/strong><span class=\"ng-star-inserted\"> Il sert de substrat aux rev\u00eatements de platine ou d\u2019oxydes m\u00e9talliques mixtes, qui conf\u00e8rent aux cellules \u00e9lectrolytiques une grande conductivit\u00e9 et une grande stabilit\u00e9 chimique.<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h2 class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">R\u00e9sum\u00e9 \u2014 Ce que les ing\u00e9nieurs ont appris<\/span><\/h2>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Le titane de grade 2 est le choix id\u00e9al pour l'ing\u00e9nierie lorsque l'on a besoin d'un mat\u00e9riau \u00e0 la fois suffisamment r\u00e9sistant pour r\u00e9sister aux conditions environnementales et facile \u00e0 usiner. Il ne pr\u00e9sente pas la m\u00eame r\u00e9sistance que les alliages utilis\u00e9s dans l'a\u00e9rospatiale, mais sa r\u00e9sistance \u00e0 la corrosion, sa soudabilit\u00e9 et sa capacit\u00e9 \u00e0 \u00eatre form\u00e9 \u00e0 froid en font le mat\u00e9riau id\u00e9al pour les \u00e9quipements destin\u00e9s aux secteurs chimique, maritime et de la transformation industrielle.<\/span><\/p>\n<p class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Pour l'ing\u00e9nieur concepteur, le Grade 2 constitue une alternative solide et l\u00e9g\u00e8re \u00e0 l'acier inoxydable, qui emp\u00eache la corrosion avant m\u00eame qu'elle ne se d\u00e9clare. Sur le plan de la fabrication, une protection rigoureuse pendant le soudage et un contr\u00f4le strict de la vitesse et de l'avance lors de l'usinage sont les seuls moyens de tirer le meilleur parti de ce m\u00e9tal hautement performant.<\/span><\/p>\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\">Q1 : Le titane de grade 2 est-il plus r\u00e9sistant que l'acier ?<\/span><\/strong><br class=\"ng-star-inserted\" \/><span class=\"ng-star-inserted\">Le titane de grade 2 (~345 MPa) n\u2019est pas aussi r\u00e9sistant que la plupart des aciers de construction en termes de r\u00e9sistance \u00e0 la traction. Mais son rapport r\u00e9sistance\/poids est meilleur. Il p\u00e8se environ 45% de moins que l'acier ; ainsi, une pi\u00e8ce en titane peut \u00eatre plus l\u00e9g\u00e8re qu'une pi\u00e8ce en acier de m\u00eame r\u00e9sistance, mais elle sera probablement plus volumineuse.<\/span><\/p>\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Q2 : Est-il possible de durcir du titane de grade 2 ?<\/span><\/strong><br class=\"ng-star-inserted\" \/><span class=\"ng-star-inserted\">Non. Il n'est pas possible de durcir l'alliage Alpha de grade 2 par chauffage (trempe\/vieillissement). Le travail \u00e0 froid (durcissement par d\u00e9formation) est le seul moyen d'augmenter la r\u00e9sistance m\u00e9canique, mais cela r\u00e9duit \u00e9galement la ductilit\u00e9. Le seul traitement thermique couramment utilis\u00e9 est le recuit de d\u00e9tente.<\/span><\/p>\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Q3 : Le titane de grade 2 poss\u00e8de-t-il un champ magn\u00e9tique ?<\/span><\/strong><br class=\"ng-star-inserted\" \/><span class=\"ng-star-inserted\">Non. Le titane de grade 2 n'est pas attir\u00e9 par les aimants. Cette propri\u00e9t\u00e9 est tr\u00e8s importante pour les applications m\u00e9dicales (compatibilit\u00e9 IRM), les navires de d\u00e9minage et les bo\u00eetiers \u00e9lectroniques sensibles o\u00f9 les interf\u00e9rences magn\u00e9tiques doivent \u00eatre nulles.<\/span><\/p>\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Q4 : Que se passe-t-il si je soude du titane de grade 2 sans protection gazeuse ?<\/span><\/strong><br class=\"ng-star-inserted\" \/><span class=\"ng-star-inserted\">Rupture imm\u00e9diate. Le m\u00e9tal d'apport absorbe l'azote et l'oxyg\u00e8ne pr\u00e9sents dans l'air, ce qui le rend cassant. Lorsque la soudure refroidit, elle risque de se fissurer ou de se rompre sous l'effet d'une force minime. Une d\u00e9coloration (teinte bleue, violette ou pr\u00e9sence d'une poudre blanche) est un signe \u00e9vident que la protection a \u00e9chou\u00e9.<\/span><\/p>\n<p class=\"ng-star-inserted\"><strong class=\"ng-star-inserted\"><span class=\"ng-star-inserted\">Q5 : Pourquoi utilise-t-on la nuance 2 pour les \u00e9changeurs thermiques plut\u00f4t que la nuance 5 ?<\/span><\/strong><br class=\"ng-star-inserted\" \/><span class=\"ng-star-inserted\">Le Grade 2 est plus facile \u00e0 fa\u00e7onner ; il peut donc \u00eatre lamin\u00e9 en tubes \u00e0 paroi mince ou embouti en t\u00f4les aux formes complexes sans se rompre. De plus, le Grade 2 pr\u00e9sente g\u00e9n\u00e9ralement une r\u00e9sistance \u00e0 la corrosion l\u00e9g\u00e8rement sup\u00e9rieure dans les environnements chimiques courants dans les syst\u00e8mes de refroidissement (comme l\u2019eau de mer et la saumure). Pour ces applications, le Grade 5 est trop r\u00e9sistant et trop dur \u00e0 fa\u00e7onner.<\/span><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>The most common grade of commercially pure (CP) titanium is grade 2 titanium, which is often called the &#8220;workhorse&#8221; of the titanium industry.<\/p>","protected":false},"author":1,"featured_media":9825,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[103],"tags":[],"class_list":["post-9740","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) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Grade 2 Titanium: Properties, Machining &amp; Uses<\/title>\n<meta name=\"description\" content=\"Engineering guide to Grade 2 titanium, covering mechanical properties, corrosion resistance, machinability, design considerations, and common industrial applications.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cncmachiningshops.com\/fr\/grade-2-titanium\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Grade 2 Titanium Explained: Properties, Applications, Machining &amp; 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