SCr440nt face="宋體">合金結構鋼nt>
合金結構鋼：nt face="Times New Roman">SCr440nt>
執行標準nt face="Times New Roman">: JIS G4053-2003nt>
●nt face="宋體">特性及適用范圍：是最常用的合金結構鋼，抗拉強度、屈服強度及淬透性均比nt>nt face="Times New Roman">40nt>nt face="宋體">號鋼高，但焊接性有限，有形成裂紋的傾向。用於較重要的調質零件，如交變負荷下工作的零件、中等轉速和中等負荷的零件。表麵淬火後可作負荷和及耐磨性較高、而無很大沖擊的零件，如齒輪、套筒、軸、曲軸、銷子nt>
●nt face="宋體">化學成份：nt>
碳 nt face="Times New Roman">C nt>nt face="宋體">：nt>nt face="Times New Roman">0.38nt>nt face="宋體">～nt>nt face="Times New Roman">0.43nt>
矽 nt face="Times New Roman">Sint>nt face="宋體">：nt>nt face="Times New Roman">0.15nt>nt face="宋體">～nt>nt face="Times New Roman">0.35nt>
錳 nt face="Times New Roman">Mnnt>nt face="宋體">：nt>nt face="Times New Roman">0.60nt>nt face="宋體">～nt>nt face="Times New Roman">0.90nt>
硫 nt face="Times New Roman">S nt>nt face="宋體">：允許殘餘含量nt>nt face="Times New Roman">≤0.030nt>
磷 nt face="Times New Roman">P nt>nt face="宋體">：允許殘餘含量nt>nt face="Times New Roman">≤0.030nt>
鉻 nt face="Times New Roman">Crnt>nt face="宋體">：nt>nt face="Times New Roman">0.90nt>nt face="宋體">～nt>nt face="Times New Roman">1.20nt>
鎳 nt face="Times New Roman">Nint>nt face="宋體">：允許殘餘含量nt>nt face="Times New Roman">≤0.25nt>
銅 nt face="Times New Roman">Cunt>nt face="宋體">：允許殘餘含量nt>nt face="Times New Roman">≤0.030nt>
●nt face="宋體">力學性能：nt>
抗拉強度 nt face="Times New Roman">σb (MPa)nt>nt face="宋體">：nt>nt face="Times New Roman">≥980(100)nt>
屈服強度 nt face="Times New Roman">σs (MPa)nt>nt face="宋體">：nt>nt face="Times New Roman">≥785(80)nt>
伸長率 nt face="Times New Roman">δ5 (nt>nt face="宋體">％nt>nt face="Times New Roman">)nt>nt face="宋體">：nt>nt face="Times New Roman">≥9nt>
斷麵收縮率 nt face="Times New Roman">ψ (nt>nt face="宋體">％nt>nt face="Times New Roman">)nt>nt face="宋體">：nt>nt face="Times New Roman">≥45nt>
沖擊功 nt face="Times New Roman">Akv (J)nt>nt face="宋體">：nt>nt face="Times New Roman">≥47nt>
沖擊韌性值 nt face="Times New Roman">αkv (J/cm2)nt>nt face="宋體">：nt>nt face="Times New Roman">≥59(6)nt>
硬度 ：nt face="Times New Roman">≤207HBnt>
試樣尺寸：試樣毛坯尺寸為nt face="Times New Roman">25mmnt>
●nt face="宋體">熱處理規范及金相組織：熱處理規范：淬火nt>nt face="Times New Roman">850℃,nt>nt face="宋體">油冷；回火nt>nt face="Times New Roman">520℃,nt>nt face="宋體">水冷、油冷。nt>
●nt face="宋體">交貨狀態：以熱處理（正火、退火或高溫回火）或不熱處理狀態交貨，交貨狀態應在合同中註明。nt>
