发布时间:2025-01-19 09:38:27
42CrMo4V对应中国牌号:42CrMo
应国际标准组织牌号:42CrMo4
对应日本牌号:SCM440
对应德国牌号:42CrMo4
近似对应美国牌号:4140
后面的V是钒(好像也是调质的意识,不确定)
屈服强度:σs (MPa):≥930(95)
抗拉强度:σb (MPa):≥1080(110)
伸长率 δ5 (%):≥12
冲击韧性值:αkv (J/cm2):≥78(8)
硬度 :≤217HB
化学成分:碳 C :0.38~0.45% ;硅 Si:0.17~0.37% ;锰 Mn:0.50~0.80% ;硫 S :允许残余含量≤0.035%;磷 P :允许残余含量≤0.035% ;铬 Cr:0.90~1.20% ;镍 Ni:允许残余含量≤0.030% ;铜 Cu:允许残余含量≤0.030% ;钼 Mo:0.15~0.25% 。
我想开个小花店,主要卖绿植和多肉植物,店面多大平方合适,多少钱能行
2025-01-19 09:38:27 2025-01-19 09:38:27 2025-01-19 09:38:27 2025-01-19 09:38:27 2025-01-19 09:38:27 2025-01-19 09:38:27 2025-01-19 09:38:27 2025-01-19 09:38:27 2025-01-19 09:38:27 2025-01-19 09:38:27 2025-01-19 09:38:27请教如果要出租房屋自己住的比较远租客来看房自己不方便拿钥匙去开门那应该把钥匙放中介公司还是
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