马氏体型不锈钢的化学成分特征是,在0.1%-1.0%C,12%-27%Cr的不同成分组合基础上添加钼、钨、钒、和铌等元素。由于组织结构为体心立方结构,因而在高温下强度急剧下降。而在600℃以下,高温强度在各类不锈钢中 ,蠕变强度也 。440A淬火硬化性能优良、硬度高,较440B钢和40C钢有高的韧性。440B用于刃具、量具和轴承.较440A钢硬度高,较440C钢韧性高。用于刃具、阀门,440C具有所有不锈钢、耐热钢中 的硬度。用于喷嘴、轴承.440F:是提高440C钢的易切性能的钢种。用于自动车床.敝司经销有  日本不锈钢SUS301,301L,301J1,SUS302,302B,SUS303,303Se,SUS304,304L,304J1,304J2,304N1,

304N2,304LN,SUS305,SUS309,309S,SUS310,310S,SUS315,315J1,315J2,SUS316,316

L,316N,316LN,316Ti,316J1,316J1L,SUS317,317L,317LN,317J1,317J2,317J3L,SUS836L

,SUS890L,SUS321,321Ti,SUS347,SUS XM7,SUS XM15J1等奥氏体不锈钢板.棒.卷.角.管.条.角材,SUS405,SUS410L,SUS429,SUS430,,430L,430F,430LX,430J1L,430FMO,SUS434,SUS

436,436L,436J1L,SUS443,SUS444,SUS445J1,445J2,SUS447J1,SUS XM27等铁素体不锈钢板.棒.卷.管.材,SUS403,SUS410,410S,SUS420,420C,420J1,420J2,SUS429J1,SUS440,440A,440B