常炼钢种化学成分

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1、钢种标准C%Si%Mn%P%S%Q195GB/T700-2006≤0.12≤0.30≤0.50≤0.035≤0.040内控0.08～0.100.13～0.180.40～0.50≤0.035≤0.040Q215AGB/T700-2006≤0.15≤0.35≤1.20≤0.045≤0.050内控0.10～0.130.13～0.180.40～0.55≤0.045≤0.050Q215BGB/T700-2006≤0.15≤0.35≤1.20≤0.045≤0.045内控0.10～0.130.13～0.180.40～0.55≤0.045≤0.045Q235AGB/T

2、700-2006≤0.22≤0.35≤1.40≤0.045≤0.050内控0.14～0.180.13～0.180.45～0.60≤0.045≤0.050Q275AGB/T700-2006≤0.24≤0.35≤1.50≤0.045≤0.050内控0.16～0.220.13～0.180.65～0.75≤0.045≤0.050Q275BGB/T700-2006厚度≤40mm≤0.21≤0.35≤1.50≤0.045≤0.045GB/T700-2006厚度＞40mm≤0.22≤0.35≤1.50≤0.045≤0.045内控0.15～0.200.13～0.180

3、.65～0.75≤0.045≤0.045Q295AGB/T1591-94≤0.16≤0.550.80～1.50≤0.045≤0.045内控0.10～0.150.20～0.401.00～1.30≤0.035≤0.040临钢目前所炼钢种化学成分要求Q195～Q295钢种化学成分Q235B钢种化学成分标准C%Si%Mn%P%S%GB/T700-2006≤0.20≤0.35≤1.40≤0.045≤0.045Q235B1内控0.13～0.200.16±0.010.12～0.300.43±0.03≤0.030≤0.030Q235B2内控0.06～0.140.10±

4、0.010.12～0.300.43±0.03≤0.030≤0.030Q235C钢种化学成分项目C%Si%Mn%P%S%GB/T700-2006≤0.17≤0.35≤1.40≤0.040≤0.040冶炼内控0.10～0.140.15～0.300.45～0.60≤0.025≤0.025成品内控0.11～0.160.15～0.300.45～0.60≤0.025≤0.015Q235qCQ235qD钢种化学成分牌号要求化学成分（％）CSiMnPSAlSQ235qC国标≤0.20≤0.300.40～0.70≤0.035≤0.035冶炼内控0.10～0.130.12

5、～0.240.45～0.55≤0.025≤0.025精炼内控0.12～0.170.12～0.240.45～0.60≤0.025≤0.015Q235qD国标≤0.18≤0.300.50～0.80≤0.025≤0.025≥0.015冶炼内控0.11～0.130.20～0.401.20～1.40≤0.020≤0.025精炼内控0.12～0.160.12～0.240.55～0.70≤0.020≤0.015≥0.020注:①钢中残余元素铬、镍、铜含量应各不大于0.30%；②钢中酸溶铝（AlS）可以用总含铝量代替，但全铝含量应不小于0.020％。Q345A钢种化学

6、成分标准C%Si%Mn%P%S%Cep(C+Mn/6)GB/T1591-2008≤0.20≤0.50≤1.70≤0.035≤0.035中板厚度＜40mm内控0.17±0.010.12～0.501.27±0.03≤0.030≤0.0300.36～0.42中板厚度≥40mm内控0.17±0.010.12～0.501.43±0.03≤0.030≤0.0300.36～0.42Q345B钢种化学成分标准C%Si%Mn%P%S%Cep(C+Mn/6)GB/T1591-2008≤0.20≤0.50≤1.70≤0.035≤0.035Q345B1内控0.14～0.180

7、.16±0.010.12～0.501.00～1.20（1.10±0.03）≤0.030≤0.0300.36～0.42Q345B2内控0.14～0.180.16±0.010.12～0.501.20～1.40（1.30±0.03）≤0.030≤0.0300.36～0.42Q345B3内控0.14～0.180.16±0.010.12～0.501.30～1.50（1.40±0.03）≤0.030≤0.0300.36～0.42Q345C钢种化学成分C%Si%Mn%P%S%Nb%GB/T1591-2008≤0.20≤0.50≤1.70≤0.030≤0.030≤0.

8、07冶炼内控0.11～0.140.25～0.451.40～1.50≤0.020≤0.0250.