{"id":3245,"date":"2026-09-15T21:33:06","date_gmt":"2026-09-15T18:33:06","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/aisi-4140-aisi-4340-farki\/"},"modified":"2026-09-15T23:54:19","modified_gmt":"2026-09-15T20:54:19","slug":"aisi-4140-aisi-4340-farki","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/aisi-4140-aisi-4340-farki\/","title":{"rendered":"AISI 4140 ile AISI 4340 Aras\u0131ndaki Fark Nedir?"},"content":{"rendered":"

Havac\u0131l\u0131k, savunma ve enerji projelerinde en s\u0131k kar\u015f\u0131la\u015ft\u0131r\u0131lan iki ala\u015f\u0131ml\u0131 \u00e7elik AISI 4140<\/strong> ile AISI 4340<\/strong>‘t\u0131r. \u0130kisi de \u0131slah (sertle\u015ftirilip temperlenen) \u00e7eliktir, ikisi de krom ve molibden i\u00e7erir, ikisi de ayn\u0131 formlarda temin edilir. Aralar\u0131ndaki as\u0131l fark tek bir elementte d\u00fc\u011f\u00fcmlenir: nikel<\/strong>.<\/p>\n

Nikelin yapt\u0131\u011f\u0131 i\u015f<\/h3>\n

Defence Metal veri sayfalar\u0131ndaki bile\u015fimlere bak\u0131ld\u0131\u011f\u0131nda AISI 4140 krom\u2013molibden esasl\u0131d\u0131r: yakla\u015f\u0131k %1,00 krom, %0,25 molibden ve %0,40 karbon i\u00e7erir, bile\u015fiminde nikel bulunmaz. AISI 4340 ise ayn\u0131 krom\u2013molibden iskeletinin \u00fczerine %1,65\u20132,00 nikel<\/strong> ekler.<\/p>\n

Nikel, \u00e7eli\u011fin sertle\u015febilirli\u011fini<\/strong> art\u0131r\u0131r. Yani par\u00e7an\u0131n yaln\u0131zca y\u00fczeyi de\u011fil, kesitin merkezi de sertle\u015fir. Kal\u0131n kesitli bir mil, bir di\u015fli g\u00f6vdesi veya bir ini\u015f tak\u0131m\u0131 par\u00e7as\u0131 s\u00f6z konusu oldu\u011funda bu fark do\u011frudan par\u00e7an\u0131n dayan\u0131m\u0131na yans\u0131r. Nikel ayr\u0131ca temperleme sonras\u0131 toklu\u011fu<\/strong> (darbeye direnci) y\u00fckseltir; par\u00e7a y\u00fcksek mukavemete \u00e7\u0131karken gevrekle\u015fmez.<\/p>\n

Rakamlarla kar\u015f\u0131la\u015ft\u0131rma<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
\u00d6ZELL\u0130K<\/th>\nAISI 4140<\/th>\nAISI 4340<\/th>\n<\/tr>\n<\/thead>\n
Karbon (C)<\/td>\n%0,40<\/td>\n%0,38\u20130,43<\/td>\n<\/tr>\n
Krom (Cr)<\/td>\n%1,00<\/td>\n%0,70\u20130,90<\/td>\n<\/tr>\n
Molibden (Mo)<\/td>\n%0,25<\/td>\n%0,20\u20130,30<\/td>\n<\/tr>\n
Nikel (Ni)<\/td>\n\u2014<\/td>\n%1,65\u20132,00<\/td>\n<\/tr>\n
Sertle\u015ftirilmi\u015f + temperlenmi\u015f<\/td>\nRm 930 MPa (50 mm kesit)<\/td>\nRm 1793 MPa<\/td>\n<\/tr>\n
Akma (Rp0,2)<\/td>\n770 MPa (50 mm kesit)<\/td>\n1496 MPa<\/td>\n<\/tr>\n
UNS<\/td>\nG41400<\/td>\nG43406<\/td>\n<\/tr>\n
AMS<\/td>\n6349 \u00b7 6382<\/td>\n6414 \u00b7 6415 \u00b7 6484<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

De\u011ferler \u00fcr\u00fcn veri sayfalar\u0131m\u0131zdan al\u0131nm\u0131\u015ft\u0131r. AISI 4140 de\u011ferleri 50 mm kesit i\u00e7in, AISI 4340 de\u011ferleri sertle\u015ftirilmi\u015f + temperlenmi\u015f durum i\u00e7indir; kesit kal\u0131nl\u0131\u011f\u0131 ve \u0131s\u0131l i\u015flem rejimi sonucu de\u011fi\u015ftirir.<\/p>\n

Hangi durumda hangisi?<\/h3>\n

AISI 4140 yeterlidir<\/strong> \u2014 orta kesitli miller, ba\u011flant\u0131 elemanlar\u0131, kal\u0131p g\u00f6vdeleri, hidrolik par\u00e7alar\u0131, genel makine imalat\u0131. Temini daha kolayd\u0131r, i\u015flenebilirli\u011fi iyidir ve gere\u011finden fazla ala\u015f\u0131m \u00f6demezsiniz.<\/p>\n

AISI 4340 gerekir<\/strong> \u2014 kal\u0131n kesitte merkeze kadar sertlik istendi\u011finde, y\u00fcksek mukavemetle birlikte tokluk arand\u0131\u011f\u0131nda ve \u015fartname do\u011frudan AMS 6414 \/ AMS 6415 \u00e7a\u011f\u0131rd\u0131\u011f\u0131nda. Havac\u0131l\u0131k \u00e7izimlerinde bu iki AMS numaras\u0131 ge\u00e7iyorsa 4140 ile ikame edilmez.<\/p>\n

Bir \u00fcst basamak<\/h3>\n

4340’\u0131n da yetmedi\u011fi durumlarda s\u0131ra 300M<\/a> ve AerMet 100<\/a> gibi daha y\u00fcksek mukavemetli ala\u015f\u0131mlara gelir. Ayn\u0131 ailenin sementasyon (y\u00fczey sertle\u015ftirme) taraf\u0131nda ise AISI 8620<\/a> ve AISI 9310<\/a> bulunur.<\/p>\n

\n

Teknik veri sayfalar\u0131<\/p>\n

AISI 4140 \u2014 kimyasal bile\u015fim, mekanik de\u011ferler, AMS kar\u015f\u0131l\u0131klar\u0131<\/a><\/p>\n

AISI 4340 \u2014 kimyasal bile\u015fim, mekanik de\u011ferler, AMS kar\u015f\u0131l\u0131klar\u0131<\/a><\/p>\n

Her iki kalite de yuvarlak \u00e7ubuk, lama, levha, sac, boru ve d\u00f6vme formlar\u0131nda sipari\u015f bazl\u0131 temin edilmektedir. Teklif i\u00e7in bize ula\u015f\u0131n<\/a>.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

AISI 4140 ile AISI 4340 aras\u0131ndaki temel fark nikeldir. Kimyasal bile\u015fim, mekanik de\u011ferler, AMS\/UNS kar\u015f\u0131l\u0131klar\u0131 ve hangi uygulamada hangisinin se\u00e7ilece\u011fi.<\/p>\n","protected":false},"author":1,"featured_media":3271,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-3245","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-karsilastirmalar"],"yoast_head":"\nAISI 4140 ile AISI 4340 Fark\u0131 Nedir? | Defence Metal<\/title>\n<meta name=\"description\" content=\"AISI 4140 ile AISI 4340 aras\u0131ndaki temel fark nikeldir. 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