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保證淬透性結(jié)構(gòu)鋼45MnBH保證淬透性結(jié)構(gòu)鋼45MnBH 標(biāo)準(zhǔn):GB/T?3077-1988 【化學(xué)成分】(質(zhì)量分?jǐn)?shù))(%) 碳?C?:0.42~0.49 錳?Mn:1.00~1.40 硫?S?:允許殘余含量≤0.035 磷?P?:允許殘余含量≤0.035 鉻?Cr:允許殘余含量≤0.030 鎳?Ni:允許殘余含量≤0.030 銅?Cu:允許殘余含量≤0.30 硼?B?:0.0005~0.0035
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