優(yōu)質(zhì)碳素結(jié)構(gòu)鋼 GB /T 699 - 1999
① 表中所列牌號(hào)為優(yōu)質(zhì)鋼。高級(jí)優(yōu)質(zhì)鋼,在牌號(hào)后綴A,統(tǒng)一數(shù)字代號(hào)最后一位數(shù)字改為3;特級(jí)優(yōu)質(zhì)鋼,在牌號(hào)后綴E,統(tǒng)一數(shù)字代號(hào)最后一位數(shù)字改為6;沸騰鋼,牌號(hào)后綴F,統(tǒng)一數(shù)字代號(hào)最后一位數(shù)字改為0;半鎮(zhèn)靜鋼,牌號(hào)后綴b,統(tǒng)一數(shù)字代號(hào)最后一位數(shù)字為1
優(yōu)質(zhì)鋼 P≤0.035%,S≤0.035%
高級(jí)優(yōu)質(zhì)鋼 P≤0.030%,S≤0.030%
特級(jí)優(yōu)質(zhì)鋼 P≤0.025%,S≤0.020%
② 08鋼用鋁脫氧冶煉鎮(zhèn)靜鋼,錳含量下限為0.25%,硅含量不大于0.03%,鋁含量為0.02%~0.07%,此時(shí)鋼牌號(hào)為08Al
③ 經(jīng)供需雙方協(xié)議,08~25鋼可供應(yīng)硅含量不大于0.17%的半鎮(zhèn)靜鋼,其牌號(hào)為08b~25b
④ 使用廢鋼冶煉的鋼允許含銅量不大于0.30%;熱壓力加工用鋼的銅含量應(yīng)不大于0.20%
⑤ 冷沖壓用的沸騰鋼硅含量應(yīng)不大于0.03%
⑥ 氧氣轉(zhuǎn)爐冶煉的鋼,其氮含量應(yīng)不大于0.008%
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