{"id":6211,"date":"2026-09-25T19:52:43","date_gmt":"2026-09-25T16:52:43","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/25\/aisi-420b-aisi-420c-farki\/"},"modified":"2026-09-30T10:43:48","modified_gmt":"2026-09-30T07:43:48","slug":"aisi-420b-aisi-420c-farki","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/25\/aisi-420b-aisi-420c-farki\/","title":{"rendered":"AISI 420B ile AISI 420C Aras\u0131ndaki Fark Nedir?"},"content":{"rendered":"

AISI 420B<\/strong> ve AISI 420C<\/strong> ayn\u0131 ailenin iki \u00fcyesidir: her ikisi de %13 krom martenzitik paslanmaz \u00e7eliktir, her ikisi de su verilerek sertle\u015ftirilir. Aralar\u0131ndaki tek kas\u0131tl\u0131 fark karbon oran\u0131d\u0131r<\/strong> — ve bu fark do\u011frudan ula\u015f\u0131labilir sertli\u011fi belirler.<\/p>\n

Karbon = sertlik<\/h3>\n

Martenzitik paslanmazlarda su verme sonras\u0131 sertlik, \u00e7\u00f6z\u00fcnm\u00fc\u015f karbon miktar\u0131yla artar. 420 ailesi tam olarak bu mant\u0131k \u00fczerine kurulmu\u015ftur: ayn\u0131 krom seviyesinde farkl\u0131 karbon kademeleri sunulur.<\/p>\n

Malzeme numaras\u0131yla konu\u015fursak: 1.4028’de karbon %0,26 – 0,35<\/strong>, 1.4034’te %0,43 – 0,50<\/strong>‘dir. Karbon artt\u0131k\u00e7a su verme sonras\u0131 sertlik y\u00fckselir; 1.4034 i\u00e7in Notz Metall, Deutsche Edelstahlwerke ve Carpenter\/Latrobe ~52 – 55 HRC band\u0131 bildiriyor. Bunun kar\u015f\u0131l\u0131\u011f\u0131nda tokluk ve \u015fekillendirilebilirlik d\u00fc\u015fer.<\/p>\n

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

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
\u00d6ZELL\u0130K<\/th>\nAISI 420B (1.4028)<\/th>\nAISI 420C (1.4034)<\/th>\n<\/tr>\n<\/thead>\n
EN ad\u0131<\/td>\nX30Cr13<\/td>\nX46Cr13<\/td>\n<\/tr>\n
Karbon (C)<\/strong><\/td>\n%0,26 – 0,35<\/strong><\/td>\n%0,43 – 0,50<\/strong><\/td>\n<\/tr>\n
Krom (Cr)<\/td>\n%12,00 – 14,00<\/td>\n%12,50 – 14,50<\/td>\n<\/tr>\n
Mangan (Mn)<\/td>\nmax %1,50<\/td>\nmax %1,00<\/td>\n<\/tr>\n
Sertle\u015ftirme s\u0131cakl\u0131\u011f\u0131<\/td>\nyakla\u015f\u0131k 980 – 1050 °C<\/td>\nyakla\u015f\u0131k 980 – 1050 °C<\/td>\n<\/tr>\n
Maksimum sertlik i\u00e7in temperleme<\/td>\n150 – 350 °C<\/td>\n150 – 250 °C<\/td>\n<\/tr>\n
Ula\u015f\u0131labilir sertlik<\/td>\ndaha d\u00fc\u015f\u00fck<\/td>\ndaha y\u00fcksek<\/td>\n<\/tr>\n
Tokluk<\/td>\ndaha iyi<\/td>\ndaha d\u00fc\u015f\u00fck<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Is\u0131l i\u015flem<\/h3>\n

Her iki kalite de yakla\u015f\u0131k 980 – 1050 °C<\/strong>‘den ya\u011f veya havada su verilerek sertle\u015ftirilir (tam aral\u0131k fabrikaya g\u00f6re de\u011fi\u015fir). Maksimum sertlik isteniyorsa temperleme d\u00fc\u015f\u00fck tutulur: Notz Metall 1.4028 i\u00e7in 200 – 350 °C, 1.4034 i\u00e7in 150 – 250 °C veriyor; Carpenter\/Latrobe tipik olarak 149 °C kullan\u0131yor.<\/p>\n

Korozyon direnci bu ailede sertle\u015ftirilmi\u015f ve parlat\u0131lm\u0131\u015f halde<\/strong> en iyidir; tavl\u0131 halde de\u011fil. Hi\u00e7biri klor\u00fcrl\u00fc ortam \u00e7eli\u011fi de\u011fildir.<\/p>\n

Sipari\u015f verirken dikkat — bu b\u00f6l\u00fcm \u00f6nemlidir<\/h3>\n
\n

“420A \/ 420B \/ 420C” hi\u00e7bir standartta tan\u0131ml\u0131 de\u011fildir.<\/p>\n

Bu harf ekleri EN 10088-3’te yoktur (o standart X20Cr13, X30Cr13, X39Cr13, X46Cr13 adlar\u0131n\u0131 kullan\u0131r), BS 970’te yoktur (o da 420S29 \/ 420S37 numaralar\u0131n\u0131 kullan\u0131r) ve ASTM\/UNS’te yoktur — Amerikan sisteminde tek bir Tip 420 \/ UNS S42000<\/strong> vard\u0131r. Harfler, so\u011fuk hadde \u015ferit ve b\u0131\u00e7ak sekt\u00f6r\u00fcn\u00fcn ticari k\u0131saltmas\u0131d\u0131r.<\/p>\n

Ve herkes ayn\u0131 harfi ayn\u0131 malzemeye demiyor.<\/strong> \u015eerit piyasas\u0131 420C’yi 1.4034 olarak kullan\u0131r; Ugitech ise kendi \u00e7ubuk katalo\u011funda “420C”yi 1.4031<\/strong> (X39Cr13) sat\u0131r\u0131na koyar. Aradaki fark %0,07 karbon ve farkl\u0131 bir krom band\u0131d\u0131r.<\/p>\n

Bu y\u00fczden sipari\u015finize malzeme numaras\u0131n\u0131 yaz\u0131n:<\/strong> “420C” de\u011fil, 1.4034<\/strong>. Ya da do\u011frudan istedi\u011finiz karbon aral\u0131\u011f\u0131n\u0131 belirtin.<\/p>\n<\/div>\n

Bir nokta daha: ASTM Tip 420’de karbonun alt s\u0131n\u0131r\u0131 vard\u0131r (min %0,15), \u00fcst s\u0131n\u0131r\u0131 yoktur.<\/strong> Yani “420” yazan bir sertifika tek ba\u015f\u0131na sertlik garantisi de\u011fildir. Tedarik\u00e7iler farkl\u0131 \u00fcst s\u0131n\u0131rlar yay\u0131ml\u0131yor — Rolled Alloys %0,15–0,30, Jacquet %0,15–0,40. Sertlik kritikse karbon aral\u0131\u011f\u0131n\u0131 s\u00f6zle\u015fmeye yaz\u0131n.<\/p>\n

Nerede kullan\u0131l\u0131r?<\/h3>\n

Her iki kalite de kesici aletler, b\u0131\u00e7ak, cerrahi ve dental aletler, vana par\u00e7alar\u0131, kal\u0131plar, rulman ve a\u015f\u0131nma par\u00e7alar\u0131nda kullan\u0131l\u0131r. A\u015f\u0131nma direnci ve kesme kenar\u0131 \u00f6nceli\u011finizse 420C<\/strong> (daha y\u00fcksek karbon, daha y\u00fcksek sertlik); darbe alacak, tokluk isteyen par\u00e7alarda 420B<\/strong> tercih edilir.<\/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