鍛件用結(jié)構(gòu)鋼牌號(hào)和力學(xué)性能 GB /T 17107 - 1997
? 優(yōu)質(zhì)鋼——P≤0.035浸锨;S≤0.035稠项;Cu≤0.3抢必;Cr≤0.3践拐;Ni≤0.3
? 高級(jí)優(yōu)質(zhì)鋼(牌號(hào)后綴A)——P≤0.025;S≤0.025窜交;Cu≤0.25斜兽;Cr≤0.3;Ni≤0.3
? 特級(jí)優(yōu)質(zhì)鋼(牌號(hào)后綴E)——P≤0.025羽址;S≤0.015帕恩;Cu≤0.25;Cr≤0.3剩失;Ni≤0.3
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