{"id":6205,"date":"2026-09-25T19:52:32","date_gmt":"2026-09-25T16:52:32","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/25\/aisi-303-aisi-304-farki\/"},"modified":"2026-09-30T10:41:53","modified_gmt":"2026-09-30T07:41:53","slug":"aisi-303-aisi-304-farki","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/25\/aisi-303-aisi-304-farki\/","title":{"rendered":"AISI 303 ile AISI 304 Aras\u0131ndaki Fark Nedir?"},"content":{"rendered":"

AISI 303<\/strong> ve AISI 304<\/strong> ayn\u0131 18-8 \u00f6stenitik ailesinden gelir; krom ve nikel oranlar\u0131 neredeyse ayn\u0131d\u0131r. Aralar\u0131ndaki tek kas\u0131tl\u0131 fark k\u00fck\u00fcrtt\u00fcr<\/strong> — ve o tek fark, iki \u00e7eli\u011fi birbirinin yerine kullan\u0131lamaz hale getirir.<\/p>\n

K\u00fck\u00fcrt ne yap\u0131yor?<\/h3>\n

AISI 303’e (1.4305) %0,15 – 0,35 k\u00fck\u00fcrt bilerek eklenir<\/strong>. K\u00fck\u00fcrt, manganla birle\u015ferek \u00e7elik i\u00e7inde mangan s\u00fclf\u00fcr kal\u0131nt\u0131lar\u0131 olu\u015fturur. Bu kal\u0131nt\u0131lar tala\u015f\u0131 k\u0131rar ve kesici tak\u0131mla i\u015f par\u00e7as\u0131 aras\u0131ndaki s\u00fcrt\u00fcnmeyi d\u00fc\u015f\u00fcr\u00fcr. Sonu\u00e7, otomat tezg\u00e2hlar\u0131nda \u00e7ok daha h\u0131zl\u0131 ve sorunsuz i\u015flenebilen bir \u00e7eliktir.<\/p>\n

Burada dikkat edilecek nokta \u015fudur: \u015fartnamede k\u00fck\u00fcrt bir ALT s\u0131n\u0131rd\u0131r, \u00fcst s\u0131n\u0131r de\u011fil.<\/strong> “S %0,15 – 0,35” ifadesini tavan olarak okuyup %0,02 k\u00fck\u00fcrtl\u00fc bir sertifikay\u0131 303 sanmak, sahada s\u0131k g\u00f6r\u00fclen bir hatad\u0131r. AISI 304’te ise k\u00fck\u00fcrt bir safs\u0131zl\u0131kt\u0131r ve tavan\u0131 vard\u0131r.<\/p>\n

Bedeli: kaynak ve korozyon<\/h3>\n

K\u00fck\u00fcrd\u00fcn kazand\u0131rd\u0131\u011f\u0131 i\u015flenebilirlik, iki yerden geri al\u0131n\u0131r.<\/p>\n

Kaynak.<\/strong> Aalco ve thyssenkrupp 303’\u00fcn kaynak kabiliyetini “zay\u0131f” olarak niteliyor; Outokumpu do\u011frudan “kaynak gerektiren uygulamalar i\u00e7in tavsiye edilmez” diyor; Rodacciai ise 1.4305’i hem teslim halinde hem kaynakl\u0131 halde taneler aras\u0131 korozyona dayan\u0131kl\u0131 DE\u011e\u0130L olarak i\u015faretliyor. AISI 304 ise tam tersine kaynak i\u00e7in standart tercihtir ve normalde kaynak sonras\u0131 \u0131s\u0131l i\u015flem gerektirmez.<\/p>\n

Korozyon.<\/strong> \u0130\u015flenebilirli\u011fi sa\u011flayan s\u00fclf\u00fcr kal\u0131nt\u0131lar\u0131, ayn\u0131 zamanda \u00e7ukurcuk korozyonunun ba\u015flang\u0131\u00e7 noktalar\u0131d\u0131r. Aalco ve thyssenkrupp 303’\u00fc klor\u00fcrl\u00fc ortamlarda 60 °C \u00fczerinde riskli ve deniz servisine uygun de\u011fil<\/em> olarak tan\u0131ml\u0131yor; Outokumpu 303’\u00fc “hafif korozif ortamlar” ile s\u0131n\u0131rl\u0131yor; Carpenter ise bas\u0131n\u00e7 alt\u0131nda gaz veya s\u0131v\u0131 ta\u015f\u0131yan kaplarda kullan\u0131lmamas\u0131n\u0131 \u00f6neriyor.<\/p>\n

Rakamlarla kar\u015f\u0131la\u015ft\u0131rma<\/h3>\n

A\u015fa\u011f\u0131daki de\u011ferler EN 10088-3 d\u00f6k\u00fcm analizi s\u0131n\u0131rlar\u0131d\u0131r.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u00d6ZELL\u0130K<\/th>\nAISI 303 (1.4305)<\/th>\nAISI 304 (1.4301)<\/th>\n<\/tr>\n<\/thead>\n
Karbon (C)<\/td>\nmax %0,10<\/td>\nmax %0,07<\/td>\n<\/tr>\n
Silisyum (Si)<\/td>\nmax %1,00<\/td>\nmax %1,00<\/td>\n<\/tr>\n
Mangan (Mn)<\/td>\nmax %2,00<\/td>\nmax %2,00<\/td>\n<\/tr>\n
K\u00fck\u00fcrt (S)<\/strong><\/td>\n%0,15 – 0,35 (alt s\u0131n\u0131r)<\/strong><\/td>\nmax %0,015 – 0,030 (bkz. not)<\/td>\n<\/tr>\n
Krom (Cr)<\/td>\n%17,00 – 19,00<\/td>\n%17,50 – 19,50<\/td>\n<\/tr>\n
Nikel (Ni)<\/td>\n%8,00 – 10,00<\/td>\n%8,00 – 10,50<\/td>\n<\/tr>\n
Bak\u0131r (Cu)<\/td>\nmax %1,00<\/td>\nbelirtilmez<\/td>\n<\/tr>\n
Molibden (Mo)<\/td>\nbelirtilmez<\/td>\nbelirtilmez<\/td>\n<\/tr>\n
Kopma uzamas\u0131 (\u00e7ubuk, +AT)<\/td>\n\u2265 %35<\/td>\n\u2265 %45<\/td>\n<\/tr>\n
\u0130\u015flenebilirlik<\/td>\n\u00e7ok iyi<\/td>\niyi<\/td>\n<\/tr>\n
Kaynak kabiliyeti<\/td>\nzay\u0131f — tavsiye edilmez<\/td>\n\u00e7ok iyi<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

K\u00fck\u00fcrt notu:<\/em> 1.4301 i\u00e7in EN 10088-3:2005 ve Rodacciai max %0,030 veriyor; EN 10088-1:2014, Ugitech ve thyssenkrupp max %0,015 veriyor. \u0130ki de\u011fer de standard\u0131n farkl\u0131 bask\u0131lar\u0131ndan gelir; sipari\u015f verirken hangi bask\u0131ya g\u00f6re \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131z\u0131 belirtin.<\/p>\n

Sipari\u015f verirken dikkat<\/h3>\n
\n

AISI 303 ASTM A276 kapsam\u0131nda de\u011fildir.<\/p>\n

ASTM A240 ve A276 listelerinde S30300 yoktur. 303 \u00e7ubuk, ASTM A582<\/strong> (otomat \u00e7elikleri) kapsam\u0131ndad\u0131r. “A276’ya g\u00f6re 303” yazan bir talep teknik olarak kar\u015f\u0131l\u0131ks\u0131zd\u0131r.<\/p>\n

Ayr\u0131ca ASTM ile EN ayn\u0131 \u00e7elik de\u011fildir: ASTM A582 karbonu max %0,15 ve fosforu max %0,20 kabul eder; EN 1.4305 ise karbonu max %0,10, fosforu max %0,045 ile s\u0131n\u0131rlar. A582’yi ge\u00e7en bir \u00e7ubuk EN 10088-3’ten kalabilir.<\/p>\n<\/div>\n

Hangisi sizin i\u015finiz i\u00e7in?<\/h3>\n

Par\u00e7a \u00e7ok say\u0131da, tezg\u00e2hta i\u015flenerek<\/strong> \u00fcretilecekse ve ortam kuru\/hafif korozifse 303 do\u011fru tercihtir: mil, bur\u00e7, rakor, ba\u011flant\u0131 eleman\u0131 gibi i\u015fler bu s\u0131n\u0131fa girer.<\/p>\n

Par\u00e7a kaynaklanacaksa<\/strong>, g\u0131da\/s\u00fct\/ila\u00e7 temas\u0131nda olacaksa, klor\u00fcrl\u00fc ortama veya deniz suyuna girecekse 303 yanl\u0131\u015f tercihtir; 304 kullan\u0131lmal\u0131d\u0131r. Hem i\u015flenebilirlik hem korozyon direnci gerekiyorsa, \u00e7\u00f6z\u00fcm 303 de\u011fil, k\u00fck\u00fcrt oran\u0131 optimize edilmi\u015f 304 kaliteleridir.<\/p>\n

G\u00f6sterimler, standartlar ve AMS kar\u015f\u0131l\u0131klar\u0131<\/h3>\n

Ayn\u0131 \u00e7elik, hangi sistemde konu\u015ftu\u011funuza g\u00f6re farkl\u0131 isimle an\u0131l\u0131r. Sipari\u015f ve sertifika kar\u0131\u015f\u0131kl\u0131klar\u0131n\u0131n \u00e7o\u011fu buradan \u00e7\u0131kar, o y\u00fczden k\u0131saca \u00f6zetleyelim:<\/p>\n