夜色网,色欲aⅴ精品一区二区三区四区,国产精品jizz视频国产y网,欧美精品综合视频一区二区

SKH57是日本JIS標(biāo)準(zhǔn)高速鋼鋼號, 日立金屬HITACHI 牌號XVC5, 具有耐磨耗,耐燒結(jié),高耐壓性高速鋼.多用于冷鍛模,拉伸模,切削等.

供貨狀態(tài)及硬度：  軟性退火  硬度≤285HB

SKH57、SKH57、SKH57、SKH57、SKH57化學(xué)成分(質(zhì)量分?jǐn)?shù),%)： C 1.25  Si0.25    Mn 0.35   Cr 4.15   W 10.00 P≤0.025   S≤0.010 Mo3.50  V3.45  Co 10.00

SKH57、SKH57、SKH57、SKH57、SKH57
退火規(guī)范 :   退火溫度820～880℃,保溫時間1～3H,爐冷

淬火、 回火規(guī)范：淬火溫度1230～1250℃油冷,回火溫度550～580℃空冷,硬度≥

相組織：回火馬氏體。
SKH57、SKH57、SKH57、SKH57、SKH57SKH57、SKH57、SKH57、SKH57、SKH57SKH57、SKH57、SKH57、SKH57、SKH57SKH57、SKH57、SKH57、SKH57、SKH57SKH57、SKH57、SKH57、SKH57、SKH57SKH57、SKH57、SKH57、SKH57、SKH57SKH57、SKH57、SKH57、SKH57、SKH57SKH57、SKH57、SKH57、SKH57、SKH57SKH57、SKH57、SKH57、SKH57、SKH57SKH57、SKH57、SKH57、SKH57、SKH57SKH57、SKH57、SKH57、SKH57、SKH57