{"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\/tr\/718-steel\/","title":{"rendered":"718 \u00c7eli\u011fi: Kimyasal Bile\u015fimi, \u00d6zellikleri ve Kal\u0131p Yap\u0131m\u0131ndaki M\u00fchendislik Uygulamalar\u0131"},"content":{"rendered":"
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718 \u00e7eli\u011fi, genellikle plastik enjeksiyon kal\u0131plar\u0131 yapmak i\u00e7in kullan\u0131lan \u00f6n sertle\u015ftirilmi\u015f bir ala\u015f\u0131m \u00e7eli\u011fidir; \u00f6zellikle g\u00fc\u00e7l\u00fc, tok ve boyut olarak kararl\u0131 olmas\u0131 gereken b\u00fcy\u00fck ve orta boy kal\u0131plar i\u00e7in. 718 \u00e7eli\u011fi, P20 tipi kal\u0131p \u00e7eliklerinin geli\u015ftirilmi\u015f bir versiyonudur. Daha iyi sertlik homojenli\u011fi, i\u015flenebilirlik ve parlatma performans\u0131na sahiptir; bu da onu karma\u015f\u0131k ve y\u00fcksek hassasiyetli kal\u0131p uygulamalar\u0131 i\u00e7in en iyi se\u00e7im haline getirir.<\/p>\n

M\u00fchendislik a\u00e7\u0131s\u0131ndan bak\u0131ld\u0131\u011f\u0131nda, 718 \u00e7eli\u011fi kal\u0131p yap\u0131m\u0131nda ortaya \u00e7\u0131kan bir dizi sorunu \u00e7\u00f6zer: \u0131s\u0131l i\u015flem s\u0131ras\u0131ndaki distorsiyonu azalt\u0131r, teslim s\u00fcrelerini h\u0131zland\u0131r\u0131r ve kal\u0131n kal\u0131p bloklar\u0131n\u0131n mekanik \u00f6zelliklerini tutarl\u0131 tutar. Bu makale, 718 \u00e7eli\u011finin kimyasal yap\u0131s\u0131n\u0131, mekanik ve fiziksel \u00f6zelliklerini, i\u015flenebilirli\u011fini, \u0131s\u0131l i\u015flem davran\u0131\u015f\u0131n\u0131 ve yayg\u0131n m\u00fchendislik kullan\u0131mlar\u0131n\u0131 inceler. Bu bilgiler, kal\u0131p tasar\u0131mc\u0131lar\u0131n\u0131n, tak\u0131m m\u00fchendislerinin ve sat\u0131n alma ekiplerinin sadece bir kalite se\u00e7mek yerine ger\u00e7ek \u00fcretim ihtiya\u00e7lar\u0131na g\u00f6re malzeme se\u00e7melerine yard\u0131mc\u0131 olacakt\u0131r.<\/p>\n

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718 \u00c7eli\u011fi Nedir ve Nas\u0131l S\u0131n\u0131fland\u0131r\u0131l\u0131r?<\/span><\/h2>\n

Malzeme Tan\u0131m\u0131 ve Sekt\u00f6rdeki Konumu<\/span><\/h3>\n

718 \u00e7eli\u011fi, \u00f6zellikle plastik enjeksiyon kal\u0131plama end\u00fcstrisi i\u00e7in geli\u015ftirilmi\u015f, \u00f6n sertle\u015ftirilmi\u015f, d\u00fc\u015f\u00fck ala\u015f\u0131ml\u0131 bir tak\u0131m \u00e7eli\u011fidir. Metalurjik a\u00e7\u0131dan, <\/span>P20-modifiye<\/span><\/strong> ailesine aittir.<\/span><\/p>\n

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  • \n

    Temel Referans:<\/span><\/strong> Standart P20 (DIN 1.2311) k\u00fc\u00e7\u00fck kal\u0131plar i\u00e7in m\u00fckemmeldir ancak kal\u0131n bloklar\u0131n merkezinde (kesitler >400mm) \u201csertlik d\u00fc\u015f\u00fc\u015f\u00fc\u201d sorunu ya\u015far.<\/span><\/p>\n<\/li>\n

  • \n

    718 \u00c7\u00f6z\u00fcm\u00fc:<\/span><\/strong> Yakla\u015f\u0131k <\/span>1% Nikel<\/span><\/strong>, eklenmesiyle 718 \u00e7eli\u011fi <\/span>sertle\u015febilirli\u011fi<\/span><\/strong>. art\u0131r\u0131r. Bu, 600mm kal\u0131nl\u0131\u011f\u0131ndaki bir blo\u011fun y\u00fczeyden \u00e7ekirde\u011fe kadar tutarl\u0131 bir mikro yap\u0131ya ve sertli\u011fe sahip olmas\u0131n\u0131 sa\u011flar.<\/span><\/p>\n<\/li>\n<\/ul>\n

    Yayg\u0131n Standartlar ve Tan\u0131mlamalar<\/span><\/h3>\n

    M\u00fchendisler ve sat\u0131n alma y\u00f6neticileri 718 ile \u00e7e\u015fitli uluslararas\u0131 tan\u0131mlamalar alt\u0131nda kar\u015f\u0131la\u015facakt\u0131r. Kimyasal olarak benzer olsalar da, spesifik haddeleme i\u015flemi farkl\u0131l\u0131k g\u00f6sterebilir.<\/span><\/p>\n

    Tablo 1: 718 Kal\u0131p \u00c7eli\u011fi i\u00e7in Uluslararas\u0131 Tan\u0131mlamalar<\/span><\/strong><\/p>\n

    \n\n\n\n\n\n\n\n
    B\u00f6lge \/ Standart<\/span><\/td>\nTan\u0131mlama<\/span><\/td>\nM\u00fchendislik Notlar\u0131<\/span><\/td>\n<\/tr>\n
    \u00c7in (GB)<\/span><\/strong><\/td>\n3Cr2NiMo<\/span><\/strong><\/td>\nKimyasal bile\u015fim standard\u0131.<\/span><\/td>\n<\/tr>\n
    Avrupa (DIN\/EN)<\/span><\/strong><\/td>\n1.2738<\/span><\/strong><\/td>\nB\u00fcy\u00fck kal\u0131p tabanlar\u0131 i\u00e7in birincil Avrupa standard\u0131.<\/span><\/td>\n<\/tr>\n
    ABD (AISI)<\/span><\/strong><\/td>\nP20 + Ni<\/span><\/strong><\/td>\nGenellikle genel olarak \u201cP20 art\u0131 Nikel\u201d \u015feklinde belirtilir.\u201d<\/span><\/td>\n<\/tr>\n
    Sekt\u00f6r Ad\u0131<\/span><\/strong><\/td>\n718 \/ 718H<\/span><\/strong><\/td>\n\u201c718\u201d genellikle 28\u201334 HRC'yi ifade eder; \u201c718H\u201d 34\u201338 HRC'yi ifade eder.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

    M\u00fchendislik Paket Servisi:<\/span><\/strong> 718, kal\u0131p \u00e7eli\u011fi se\u00e7iminde \u201cideal noktay\u0131\u201d i\u015fgal eder. B\u00fcy\u00fck veya parlak par\u00e7alar i\u00e7in P20'den daha iyi performans sunar ancak NAK80 gibi \u00e7\u00f6kelme sertle\u015ftirmeli \u00e7eliklerden veya S136 gibi paslanmaz kalitelerden \u00f6nemli \u00f6l\u00e7\u00fcde daha kolay i\u015flenir ve daha ucuzdur.<\/span><\/p>\n

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    Kimyasal Bile\u015fim Nedir ve Ala\u015f\u0131m Elementlerinin Rol\u00fc Nedir?<\/span><\/h2>\n

    718 \u00e7eli\u011finin standart P20'ye g\u00f6re performans avantajlar\u0131, spesifik ala\u015f\u0131m tasar\u0131m\u0131na dayanmaktad\u0131r. Sadece sertlik eklemekle ilgili de\u011fil, eklemekle ilgilidir <\/span>tekd\u00fczelik<\/span><\/strong>.<\/span><\/p>\n

    Tablo 2: Tipik Kimyasal Bile\u015fim (a\u011f\u0131rl\u0131k\u00e7a %)<\/span><\/strong><\/p>\n

    \n\n\n\n\n\n\n\n\n\n
    Element<\/span><\/td>\nTipik Aral\u0131k<\/span><\/td>\nBirincil M\u00fchendislik Rol\u00fc<\/span><\/td>\n<\/tr>\n
    Karbon (C)<\/span><\/strong><\/td>\n0.30 \u2013 0.40<\/span><\/td>\nTemel mukavemet sa\u011flar ve martenzitik\/bainitik yap\u0131y\u0131 m\u00fcmk\u00fcn k\u0131lar.<\/span><\/td>\n<\/tr>\n
    Krom (Cr)<\/span><\/strong><\/td>\n1.40 \u2013 2.00<\/span><\/td>\nSertle\u015febilirli\u011fi art\u0131r\u0131r ve orta d\u00fczeyde korozyon direnci sa\u011flar.<\/span><\/td>\n<\/tr>\n
    Nikel (Ni)<\/span><\/strong><\/td>\n0.80 \u2013 1.20<\/span><\/strong><\/td>\nTemel Farkl\u0131la\u015ft\u0131r\u0131c\u0131.<\/span><\/strong> Toklu\u011fu ve derin sertle\u015febilirli\u011fi art\u0131r\u0131r.<\/span><\/td>\n<\/tr>\n
    Molibden (Mo)<\/span><\/strong><\/td>\n0.30 \u2013 0.55<\/span><\/td>\nTemper gevrekle\u015fmesini \u00f6nler ve s\u0131cakl\u0131kta mukavemeti korur.<\/span><\/td>\n<\/tr>\n
    Manganez (Mn)<\/span><\/strong><\/td>\n0.80 \u2013 1.00<\/span><\/td>\nDeoksidan; sertle\u015febilirli\u011fe katk\u0131da bulunur.<\/span><\/td>\n<\/tr>\n
    Silisyum (Si)<\/span><\/strong><\/td>\n0.20 \u2013 0.40<\/span><\/td>\nDeoksidizer.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

    Kal\u0131p \u00c7eli\u011finde Nikel (Ni) Neden \u00d6nemlidir<\/span><\/h3>\n

    Nikel ilavesi 718'in tan\u0131mlay\u0131c\u0131 \u00f6zelli\u011fidir. Standart \u00e7eliklerde, b\u00fcy\u00fck bir blo\u011fun merkezindeki so\u011fuma h\u0131z\u0131, sert bir mikro yap\u0131 olu\u015fturamayacak kadar yava\u015ft\u0131r ve yumu\u015fak noktalar olu\u015fur.<\/span><\/p>\n

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    • \n

      Sertle\u015febilirlik:<\/span><\/strong> Nikel, so\u011fuma s\u0131ras\u0131nda daha yumu\u015fak perlit fazlar\u0131n\u0131n olu\u015fumunu bast\u0131r\u0131r. Bu, istenen sert mikro yap\u0131n\u0131n (martenzit\/bainit) devasa bir blo\u011fun yava\u015f so\u011fuyan merkezinde bile olu\u015fmas\u0131n\u0131 sa\u011flar.<\/span><\/p>\n<\/li>\n

    • \n

      Parlat\u0131labilirlik:<\/span><\/strong> Homojen bir mikro yap\u0131 e\u015fit \u015fekilde parlat\u0131l\u0131r. P20 genellikle ayna parlatma s\u0131ras\u0131nda \u201cportakal kabu\u011fu\u201d veya dalgalanma olu\u015fturan segregasyon bantlar\u0131na sahiptir. 718\u2019in homojenli\u011fi bu riski \u00f6nemli \u00f6l\u00e7\u00fcde azalt\u0131r.<\/span><\/p>\n<\/li>\n<\/ul>\n

      \n

      Mekanik ve Fiziksel \u00d6zellikler Nelerdir?<\/span><\/h2>\n

      For mold designers, the mechanical properties of 718 steel define the mold\u2019s lifespan, resistance to clamping forces, and ability to withstand injection pressures.<\/span><\/p>\n

      Mechanical Properties (Pre-Hardened Condition)<\/span><\/h3>\n

      718 is almost exclusively used in the quenched and tempered condition supplied by the mill.<\/span><\/p>\n

      Table 3: Typical Mechanical Properties (at Room Temperature)<\/span><\/strong><\/p>\n

      \n\n\n\n\n\n\n\n\n
      M\u00fclkiyet<\/span><\/td>\nDe\u011fer (Tipik)<\/span><\/td>\nM\u00fchendislik Yorumu<\/span><\/td>\n<\/tr>\n
      Sertlik<\/span><\/strong><\/td>\n32 \u2013 38 HRC<\/span><\/strong><\/td>\nMachinable with carbide tools; hard enough to resist general wear.<\/span><\/td>\n<\/tr>\n
      \u00c7ekme Dayan\u0131m\u0131<\/span><\/strong><\/td>\n~1000 \u2013 1150 MPa<\/span><\/td>\nHigh resistance to mold plate cracking under clamping pressure.<\/span><\/td>\n<\/tr>\n
      Akma Mukavemeti<\/span><\/strong><\/td>\n~850 \u2013 950 MPa<\/span><\/td>\nPrevents plastic deformation of parting lines (flash).<\/span><\/td>\n<\/tr>\n
      Uzama<\/span><\/strong><\/td>\n> 13%<\/span><\/td>\nGood toughness; resists cracking at sharp internal corners.<\/span><\/td>\n<\/tr>\n
      Impact Energy<\/span><\/strong><\/td>\n> 20 J (Charpy V)<\/span><\/td>\nSufficient shock resistance for rapid mold cycling.<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

      Physical Properties for Thermal Analysis<\/span><\/h3>\n

      Understanding thermal properties is vital for calculating cooling cycle times and thermal expansion in multi-material molds (e.g., combining 718 with Beryllium Copper inserts).<\/span><\/p>\n

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      • \n

        Yo\u011funluk:<\/span><\/strong> 7,85 g\/cm\u00b3<\/span><\/p>\n<\/li>\n

      • \n

        Termal \u0130letkenlik:<\/span><\/strong> ~29.0 W\/m\u00b7K (at 20\u00b0C). <\/span>Note: This is moderate. For faster cycles, Cu-Be inserts are often added to 718 cores.<\/span><\/p>\n<\/li>\n

      • \n

        Coefficient of Thermal Expansion:<\/span><\/strong> ~12.5 \u00b5m\/m\u00b7\u00b0C (20\u2013200\u00b0C).<\/span><\/p>\n<\/li>\n<\/ul>\n

        \n

        Is Heat Treatment Necessary for 718 Steel?<\/span><\/h2>\n

        One of the most frequent questions from procurement teams is whether 718 requires heat treatment after machining. <\/span>The general engineering answer is No.<\/span><\/strong><\/p>\n

        The \u201cAs-Delivered\u201d Advantage<\/span><\/h3>\n

        718 is sold as \u201cPre-Hardened.\u201d This is a massive logistical advantage.<\/span><\/p>\n

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        1. \n

          No Distortion:<\/span><\/strong> Because the steel is already hardened, mold makers can machine pockets, drill water lines, and finish the mold to final tolerance without sending it out for heat treatment. There is no risk of the mold warping or cracking during a quench.<\/span><\/p>\n<\/li>\n

        2. \n

          Immediate Polishing:<\/span><\/strong> Once machined, the mold is ready for EDM and polishing immediately.<\/span><\/p>\n<\/li>\n<\/ol>\n

          Can You Re-Harden 718?<\/span><\/h3>\n

          Technically, yes, but it is <\/span>not recommended<\/span><\/strong>.<\/span><\/p>\n

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          • \n

            Risk:<\/span><\/strong> Heating 718 to austenitizing temperatures (approx. 850\u00b0C) and quenching it will destroy the precision dimensions achieved during machining.<\/span><\/p>\n<\/li>\n

          • \n

            Hardness Ceiling:<\/span><\/strong> Even with aggressive quenching, 718 will rarely exceed 50-52 HRC, and it becomes brittle. If higher hardness is required, engineers should select a different steel (like H13 or 8407) from the start.<\/span><\/p>\n<\/li>\n<\/ul>\n

            Surface Hardening (Nitriding)<\/span><\/h3>\n

            While bulk hardening is avoided, <\/span>Nitr\u00fcrleme<\/span><\/strong> is an excellent option for 718.<\/span><\/p>\n

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            • \n

              S\u00fcre\u00e7:<\/span><\/strong> Gas or Ion Nitriding at temperatures below the tempering point (approx. 500\u00b0C).<\/span><\/p>\n<\/li>\n

            • \n

              Sonu\u00e7:<\/span><\/strong> Creates a hard surface skin (~60-65 HRC equivalent) for wear resistance against abrasive glass-filled plastics, without distorting the core of the mold.<\/span><\/p>\n<\/li>\n<\/ul>\n

              \n

              How Does 718 Perform in Machining and Polishing? (DFM)<\/span><\/h2>\n

              For manufacturing engineers, the machinability of 718 is a critical factor in quoting and scheduling.<\/span><\/p>\n

              CNC Machining Characteristics<\/span><\/h3>\n
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                \u0130\u015flenebilirlik Derecesi:<\/span><\/strong> Good. It machines similarly to P20 but requires slightly more power due to the higher toughness from Nickel.<\/span><\/p>\n<\/li>\n

              • \n

                Aletler:<\/span><\/strong> Coated carbide tools (TiAlN) are standard. High-Speed Steel (HSS) tools will wear rapidly.<\/span><\/p>\n<\/li>\n

              • \n

                Uniformity:<\/span><\/strong> The key benefit of 718 in machining is the lack of \u201chard spots.\u201d The uniform structure allows for consistent cutting speeds and feeds, allowing lights-out machining reliability.<\/span><\/p>\n<\/li>\n<\/ul>\n

                EDM (Elektriksel De\u015farj \u0130\u015fleme)<\/span><\/h3>\n

                718 performs excellently in EDM. The homogeneous structure produces a stable, even recast layer (white layer).<\/span><\/p>\n

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                  En \u0130yi Uygulama:<\/span><\/strong> The recast layer must be removed via grinding or stoning, as it is brittle and can initiate cracks or fatigue failure on the mold surface.<\/span><\/p>\n<\/li>\n<\/ul>\n

                  Parlatma ve Foto\u011fraf Da\u011flama<\/span><\/h3>\n
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                    Parlatma:<\/span><\/strong> 718, P20\u201cye g\u00f6re \u00e7ok daha kolay bir \u015fekilde y\u00fcksek parlakl\u0131kta y\u00fczey (SPI A2 veya A3) olu\u015fturur. Vakumlu gaz giderme ve d\u00fc\u015f\u00fck k\u00fck\u00fcrt i\u00e7eri\u011fi (tipik olarak <0.005%), elmas parlatma s\u0131ras\u0131nda \u201di\u011fne deliklerini\u201c ve \u201dkuyruklu y\u0131ld\u0131zlar\u0131" \u00f6nler.<\/span><\/p>\n<\/li>\n

                  • \n

                    Dokuland\u0131rma:<\/span><\/strong> Homojen tane yap\u0131s\u0131, tutarl\u0131 asit da\u011flama performans\u0131 sa\u011flar. Dokular, d\u00fc\u015f\u00fck kaliteli \u00e7eliklerde g\u00f6r\u00fclen \u00e7izgilenme olmadan net ve homojen \u00e7\u0131kar.<\/span><\/p>\n<\/li>\n<\/ul>\n

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                    Tipik M\u00fchendislik Uygulamalar\u0131 Nelerdir?<\/span><\/h2>\n

                    718 \u00e7eli\u011fi, boyut, tokluk ve y\u00fczey kalitesinin kesi\u015fti\u011fi uygulamalar i\u00e7in i\u015f at\u0131d\u0131r.<\/span><\/p>\n

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                    1. \n

                      B\u00fcy\u00fck Plastik Enjeksiyon Kal\u0131plar\u0131:<\/span><\/strong><\/p>\n

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                        Otomotiv tamponlar\u0131, g\u00f6sterge panelleri ve kap\u0131 panelleri.<\/span><\/p>\n<\/li>\n

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                        TV kasalar\u0131 ve b\u00fcy\u00fck beyaz e\u015fya g\u00f6vdeleri (\u00e7ama\u015f\u0131r makineleri, klima \u00fcniteleri).<\/span><\/p>\n<\/li>\n

                      • \n

                        Neden?<\/span> Bu devasa bloklar\u0131n merkezinde sertli\u011fi yaln\u0131zca 718 garanti eder.<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n

                      • \n

                        Y\u00fcksek Parlakl\u0131kta Kozmetik Par\u00e7alar:<\/span><\/strong><\/p>\n

                          \n
                        • \n

                          T\u00fcketici elektroni\u011fi g\u00f6vdeleri, oyun konsollar\u0131.<\/span><\/p>\n<\/li>\n

                        • \n

                          Neden?<\/span> P20'den daha iyi ancak NAK80'den daha ucuz bir parlatma gerektirir.<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n

                        • \n

                          S\u0131k\u0131\u015ft\u0131rma Kal\u0131plar\u0131:<\/span><\/strong><\/p>\n

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                          • \n

                            Kau\u00e7uk ve SMC (Sac Kal\u0131plama Bile\u015fi\u011fi) kal\u0131plar\u0131.<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n

                          • \n

                            Kal\u0131p Tabanlar\u0131:<\/span><\/strong><\/p>\n

                              \n
                            • \n

                              Standart yap\u0131sal \u00e7eli\u011fin (S50C) \u00e7ok yumu\u015fak veya karars\u0131z oldu\u011fu son derece y\u00fcksek hassasiyetli kal\u0131plar i\u00e7in, rijitli\u011fi sa\u011flamak amac\u0131yla kal\u0131p taban plakalar\u0131nda 718 kullan\u0131l\u0131r.<\/span><\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n

                              \n

                              718 \u00c7elik vs. Di\u011fer Kal\u0131p \u00c7elikleri: Bir Karar Matrisi<\/span><\/h2>\n

                              Do\u011fru kal\u0131p \u00e7eli\u011fini se\u00e7mek bir \u00f6d\u00fcnle\u015fim analizidir. \u0130\u015fte 718'in birincil rakipleriyle kar\u015f\u0131la\u015ft\u0131rmas\u0131.<\/span><\/p>\n

                              718 vs. P20 (1.2311)<\/span><\/h3>\n
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                              • \n

                                Fark:<\/span><\/strong> P20'de Nikel yoktur.<\/span><\/p>\n<\/li>\n

                              • \n

                                Performans:<\/span><\/strong> P20, 100-200mm'den kal\u0131n bloklar\u0131n merkezinde sertli\u011fini kaybeder. 718, 400mm+'ya kadar sertli\u011fini korur.<\/span><\/p>\n<\/li>\n

                              • \n

                                Se\u00e7im:<\/span><\/strong> Para tasarrufu i\u00e7in k\u00fc\u00e7\u00fck, kritik olmayan kal\u0131plarda P20 kullan\u0131n. B\u00fcy\u00fck kal\u0131plar veya homojen dokulu\/parlat\u0131lm\u0131\u015f y\u00fczey gerektiren par\u00e7alar i\u00e7in 718 kullan\u0131n.<\/span><\/p>\n<\/li>\n<\/ul>\n

                                718 vs. NAK80<\/span><\/h3>\n
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                                • \n

                                  Fark:<\/span><\/strong> NAK80, daha da temiz ve sert olan \u00e7\u00f6kelme sertle\u015fmeli bir \u00e7eliktir (40 HRC).<\/span><\/p>\n<\/li>\n

                                • \n

                                  Performans:<\/span><\/strong> NAK80 \u00fcst\u00fcn ayna y\u00fczeyine (optik kalite) kadar parlat\u0131l\u0131r ancak i\u015flenmesi daha zordur ve \u00f6nemli \u00f6l\u00e7\u00fcde daha pahal\u0131d\u0131r.<\/span><\/p>\n<\/li>\n

                                • \n

                                  Se\u00e7im:<\/span><\/strong> K\u00fc\u00e7\u00fck, optik kalitede ekler (lensler) i\u00e7in NAK80 kullan\u0131n. Optik berrakl\u0131\u011f\u0131n gerekli olmad\u0131\u011f\u0131 ana kal\u0131p g\u00f6vdesi veya daha b\u00fcy\u00fck g\u00f6vdeler i\u00e7in 718 kullan\u0131n.<\/span><\/p>\n<\/li>\n<\/ul>\n

                                  718 vs. S136 (420 Paslanmaz)<\/span><\/h3>\n
                                    \n
                                  • \n

                                    Fark:<\/span><\/strong> S136 paslanmazd\u0131r; 718 de\u011fildir.<\/span><\/p>\n<\/li>\n

                                  • \n

                                    Performans:<\/span><\/strong> 718 neme veya a\u015f\u0131nd\u0131r\u0131c\u0131 plastiklere (PVC) maruz kal\u0131rsa paslan\u0131r. S136 korozyona dayan\u0131r.<\/span><\/p>\n<\/li>\n

                                  • \n

                                    Se\u00e7im:<\/span><\/strong> Medikal, g\u0131da veya PVC kal\u0131plar\u0131 i\u00e7in S136 kullan\u0131n. Korozyonun b\u00fcy\u00fck bir tehdit olmad\u0131\u011f\u0131 genel plastikler (ABS, PP, PE) i\u00e7in 718 kullan\u0131n.<\/span><\/p>\n<\/li>\n<\/ul>\n

                                    Tablo 4: Kal\u0131p \u00c7eli\u011fi Kar\u015f\u0131la\u015ft\u0131rma Matrisi<\/span><\/strong><\/p>\n

                                    \n\n\n\n\n\n\n\n\n\n
                                    \u00d6zellik<\/span><\/td>\n718 (1.2738)<\/span><\/strong><\/td>\nP20 (1.2311)<\/span><\/strong><\/td>\nNAK80<\/span><\/strong><\/td>\nS136<\/span><\/strong><\/td>\n<\/tr>\n
                                    Sertlik (HRC)<\/span><\/strong><\/td>\n30 \u2013 38<\/span><\/td>\n28 \u2013 32<\/span><\/td>\n37 \u2013 43<\/span><\/td>\n48 \u2013 52 (Is\u0131l \u0130\u015flem Sonras\u0131)<\/span><\/td>\n<\/tr>\n
                                    Tam Sertle\u015febilirlik<\/span><\/strong><\/td>\nM\u00fckemmel<\/span><\/strong><\/td>\nZay\u0131f (Kal\u0131n kesitler)<\/span><\/td>\nM\u00fckemmel<\/span><\/td>\n\u0130yi<\/span><\/td>\n<\/tr>\n
                                    Parlat\u0131labilirlik<\/span><\/strong><\/td>\n\u00c7ok iyi<\/span><\/strong><\/td>\n\u0130yi<\/span><\/td>\nEn \u0130yi (Ayna)<\/span><\/td>\nEn \u0130yi (Ayna)<\/span><\/td>\n<\/tr>\n
                                    Korozyon Direnci<\/span><\/strong><\/td>\nD\u00fc\u015f\u00fck<\/span><\/strong><\/td>\nD\u00fc\u015f\u00fck<\/span><\/td>\nD\u00fc\u015f\u00fck<\/span><\/td>\nY\u00fcksek (Paslanmaz)<\/span><\/td>\n<\/tr>\n
                                    \u0130\u015flenebilirlik<\/span><\/strong><\/td>\n\u0130yi<\/span><\/strong><\/td>\nM\u00fckemmel<\/span><\/td>\nAdil<\/span><\/td>\nAdil<\/span><\/td>\n<\/tr>\n
                                    Maliyet<\/span><\/strong><\/td>\nOrta<\/span><\/strong><\/td>\nD\u00fc\u015f\u00fck<\/span><\/td>\nY\u00fcksek<\/span><\/td>\nY\u00fcksek<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
                                    \n

                                    S\u0131n\u0131rlamalar ve Ar\u0131za Modlar\u0131 Nelerdir?<\/span><\/h2>\n

                                    \u00c7ok y\u00f6nl\u00fcl\u00fc\u011f\u00fcne ra\u011fmen, 718 \u00e7eli\u011finin net m\u00fchendislik s\u0131n\u0131rlar\u0131 vard\u0131r.<\/span><\/p>\n

                                    Korozyona Dayan\u0131kl\u0131 De\u011fildir<\/span><\/h3>\n

                                    718 paslanmaz \u00e7elik de\u011fildir.<\/span><\/strong><\/p>\n

                                      \n
                                    • \n

                                      Risk:<\/span><\/strong> PVC (hidroklorik asit salan) veya POM gibi a\u015f\u0131nd\u0131r\u0131c\u0131 plastiklerin kal\u0131planmas\u0131 durumunda veya nemli bir ortamda \u00e7al\u0131\u015f\u0131l\u0131yorsa, 718 paslan\u0131r. Bu, parlat\u0131lm\u0131\u015f y\u00fczeyleri bozar ve par\u00e7a \u00e7\u0131karma sorunlar\u0131na neden olur.<\/span><\/p>\n<\/li>\n

                                    • \n

                                      \u00c7\u00f6z\u00fcm:<\/span><\/strong> Kal\u0131p bo\u015flu\u011funun krom kaplanmas\u0131 veya S136'ya ge\u00e7ilmesi.<\/span><\/p>\n<\/li>\n<\/ul>\n

                                      A\u015f\u0131nd\u0131r\u0131c\u0131 A\u015f\u0131nma \u0130\u00e7in Uygun De\u011fildir<\/span><\/h3>\n

                                      Tok olsa da, 38 HRC sertle\u015ftirilmi\u015f tak\u0131m \u00e7eliklerine (50+ HRC) k\u0131yasla nispeten yumu\u015fakt\u0131r.<\/span><\/p>\n

                                        \n
                                      • \n

                                        Risk:<\/span><\/strong> Cam elyaf takviyeli malzemelerin (\u00f6r. PA66 + 30% GF) kal\u0131planmas\u0131, yolluk b\u00f6lgelerini ve dokular\u0131 h\u0131zla a\u015f\u0131nd\u0131r\u0131r.<\/span><\/p>\n<\/li>\n

                                      • \n

                                        \u00c7\u00f6z\u00fcm:<\/span><\/strong> 718 kal\u0131p taban\u0131 i\u00e7inde y\u00fcksek a\u015f\u0131nma b\u00f6lgelerinde H13 sertle\u015ftirilmi\u015f insertler kullan\u0131n.<\/span><\/p>\n<\/li>\n<\/ul>\n

                                        Kaynak Yap\u0131labilirlik Zorluklar\u0131<\/span><\/h3>\n

                                        Onar\u0131m amac\u0131yla 718 kayna\u011f\u0131 (\u00f6r. bir i\u015fleme hatas\u0131n\u0131n veya \u00e7apak alan\u0131n\u0131n d\u00fczeltilmesi) kat\u0131 protokoller gerektirir.<\/span><\/p>\n

                                          \n
                                        • \n

                                          Risk:<\/span><\/strong> Kaynak b\u00f6lgesi, ana metalden farkl\u0131 \u015fekilde sertle\u015febilir ve dokuland\u0131rma\/polishleme sonras\u0131nda bir \u201chayalet \u00e7izgi\u201d veya g\u00f6r\u00fcn\u00fcr iz b\u0131rakabilir.<\/span><\/p>\n<\/li>\n

                                        • \n

                                          \u00c7\u00f6z\u00fcm:<\/span><\/strong> E\u015fle\u015fen kimyasal dolgu \u00e7ubuklar\u0131 kullan\u0131n, kal\u0131b\u0131 \u00f6nceden \u0131s\u0131t\u0131n ve kaynak sonras\u0131 temperleme uygulay\u0131n.<\/span><\/p>\n<\/li>\n<\/ul>\n

                                          \n

                                          \u00d6zet \u2014 718 \u00c7eli\u011fi \u0130\u00e7in M\u00fchendislik \u00c7\u0131kar\u0131mlar\u0131<\/span><\/h2>\n

                                          718 \u00e7eli\u011fi<\/span><\/strong> b\u00fcy\u00fck \u00f6l\u00e7ekli plastik kal\u0131plama end\u00fcstrisinin belkemi\u011fidir. B\u00fcy\u00fck \u00e7elik bloklar\u0131n derinliklerinde tutarl\u0131 sertlik sa\u011flama gibi kritik sorunu \u00e7\u00f6zer; bu, standart P20'nin ba\u015faramad\u0131\u011f\u0131 bir ba\u015far\u0131d\u0131r.<\/span><\/p>\n

                                          Temel \u00d6neriler:<\/span><\/strong><\/p>\n

                                            \n
                                          1. \n

                                            718 se\u00e7in<\/span><\/strong> boyut kararl\u0131l\u0131\u011f\u0131 ve toklu\u011fun \u00f6ncelikli oldu\u011fu orta-b\u00fcy\u00fck kal\u0131plar (otomotiv tamponlar\u0131, beyaz e\u015fya g\u00f6vdeleri) i\u00e7in.<\/span><\/p>\n<\/li>\n

                                          2. \n

                                            P20'den y\u00fckseltin<\/span><\/strong> y\u00fcksek parlakl\u0131kta polish veya homojen foto-asitleme dokuland\u0131rmas\u0131 gerekiyorsa.<\/span><\/p>\n<\/li>\n

                                          3. \n

                                            Yeniden sertle\u015ftirmeyin.<\/span><\/strong> Boyutsal do\u011frulu\u011fu garanti etmek i\u00e7in malzemeyi \u00f6nceden sertle\u015ftirilmi\u015f durumunda kullan\u0131n.<\/span><\/p>\n<\/li>\n

                                          4. \n

                                            \u00c7evreye Dikkat Edin.<\/span><\/strong> Korozyon (PVC\/Nem) veya a\u015f\u0131nma (Cam Elyaf) bir fakt\u00f6rse, kal\u0131b\u0131 kaplay\u0131n veya \u00f6zel paslanmaz\/tak\u0131m \u00e7eliklerine ge\u00e7in.<\/span><\/p>\n<\/li>\n<\/ol>\n

                                            Malzeme se\u00e7imini kal\u0131p boyutunun ve plastik re\u00e7inenin \u00f6zel gereksinimleriyle uyumlu hale getirerek m\u00fchendisler, 718 \u00e7eli\u011finden yararlanarak teslim s\u00fcrelerini k\u0131saltabilir ve tutarl\u0131 par\u00e7a kalitesi sa\u011flayabilir.<\/span><\/p>\n

                                            \n

                                            S\u0131k\u00e7a Sorulan Sorular<\/span><\/h2>\n

                                            S: 718 \u00e7eli\u011fi Inconel 718 ile ayn\u0131 m\u0131d\u0131r?<\/span><\/strong>
                                            C:<\/span><\/strong> Hay\u0131r.<\/span><\/strong> Inconel 718, jet motorlar\u0131 i\u00e7in nikel bazl\u0131 bir s\u00fcper ala\u015f\u0131md\u0131r ve 20 kat daha pahal\u0131d\u0131r. \u201c718 Kal\u0131p \u00c7eli\u011fi\u201d d\u00fc\u015f\u00fck ala\u015f\u0131ml\u0131 bir tak\u0131m \u00e7eli\u011fidir (DIN 1.2738). Bir say\u0131y\u0131 payla\u015f\u0131rlar ama ba\u015fka hi\u00e7bir \u015feyi payla\u015fmazlar.<\/span><\/p>\n

                                            S: 718 \u00e7eli\u011fi ayna parlakl\u0131\u011f\u0131na kadar polishlenebilir mi?<\/span><\/strong>
                                            C:<\/span><\/strong> Evet.<\/span><\/strong> Y\u00fcksek parlakl\u0131kta bir y\u00fczey elde edebilir (yakla\u015f\u0131k SPI A2). NAK80 veya S136 gibi \u201coptik kalite\u201d olmasa da \u00e7o\u011fu parlak t\u00fcketici par\u00e7as\u0131 i\u00e7in yeterlidir.<\/span><\/p>\n

                                            S: 718 \u00e7eli\u011fi paslan\u0131r m\u0131?<\/span><\/strong>
                                            C:<\/span><\/strong> Evet.<\/span><\/strong> \u00c7ok az krom i\u00e7erir. Depolama s\u0131ras\u0131nda pas \u00f6nleyiciler gerektirir ve kuru tutulmal\u0131d\u0131r. So\u011futma kanallar\u0131 i\u00e7 paslanmay\u0131 \u00f6nlemek i\u00e7in i\u015fleme tabi tutulmal\u0131d\u0131r.<\/span><\/p>\n

                                            S: 718 ile 718H aras\u0131ndaki fark nedir?<\/span><\/strong>
                                            C:<\/span><\/strong> 718H<\/span><\/strong> standart 718\u201ce (30\u201334 HRC) k\u0131yasla biraz daha y\u00fcksek bir sertlik aral\u0131\u011f\u0131na (tipik olarak 34\u201338 HRC) \u0131s\u0131l i\u015flem uygulanm\u0131\u015f bir varyantt\u0131r. \u201dH\" Harf anlam\u0131na gelir. 718H biraz daha iyi a\u015f\u0131nma direnci ve polishlenebilirlik sunar.<\/span><\/p>\n

                                            S: 718 d\u00f6k\u00fcm kal\u0131plar\u0131 i\u00e7in uygun mudur?<\/span><\/strong>
                                            C:<\/span><\/strong> Hay\u0131r.<\/span><\/strong> 718, erimi\u015f al\u00fcminyum veya \u00e7inkonun (d\u00f6k\u00fcm) termal \u015fokuna dayanamaz. D\u00f6k\u00fcm i\u00e7in <\/span>H13 (SKD61)<\/span><\/strong> s\u0131cak i\u015f tak\u0131m \u00e7eli\u011fi kullan\u0131n.<\/span><\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

                                            718 \u00e7eli\u011fi, genellikle plastik enjeksiyon kal\u0131plar\u0131 yapmak i\u00e7in kullan\u0131lan \u00f6n sertle\u015ftirilmi\u015f bir ala\u015f\u0131m \u00e7eli\u011fidir; \u00f6zellikle g\u00fc\u00e7l\u00fc, tok ve boyut olarak kararl\u0131 olmas\u0131 gereken b\u00fcy\u00fck ve orta boy kal\u0131plar i\u00e7in.<\/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":"\n718 Steel: Composition, Properties & Mold Making Uses<\/title>\n<meta name=\"description\" content=\"Engineering overview of 718 mold steel, including chemical composition, mechanical properties, heat treatment condition, machinability, and typical mold making 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