鋼鐵材料的化學(xué)成分及性能見表3-103~表3-107。表3-103優(yōu)質(zhì)碳素結(jié)構(gòu)鋼的化學(xué)成分(GB/T699—1999)序號統(tǒng)一數(shù)字代碼牌號化學(xué)成分(質(zhì)量分?jǐn)?shù))/%CSiMnCrNiCu不大于1U20082080.05~0.110.17~0.370.35~0.650.100.300.252U20102100.07~0.130.17~0.370.35~0.650.150....[繼續(xù)閱讀]