常炼钢种化学成分.doc

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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/T700-2006≤0.22≤0.35

2、≤1.40≤0.045≤0.050内控0.14～0.180.13～0.180.45～0.60≤0.045≤0.050Q235BGB/T700-2006≤0.20≤0.35≤1.40≤0.045≤0.045内控0.14～0.180.13～0.180.45～0.60≤0.045≤0.045Q275AGB/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＞40m

3、m≤0.22≤0.35≤1.50≤0.045≤0.045内控0.15～0.200.13～0.180.65～0.75≤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**目前所炼钢种化学成分要求Q195～Q295钢种化学成分Q235C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

4、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0.10～0.130.12～0.240.45～0.55≤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.

5、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％。Q345AQ345B钢种化学成分标准钢种C%Si%Mn%P%S%GB/T1591-94Q345A≤0.20≤0.551.00～1.60≤0.045≤0.045内控0.15～0.200.20～0.401.30～1.50≤0.035≤0.040Q345B≤0.20≤0.551.00～1.60≤0.040≤0.040内控0.15～0.200.20～0.401.30～1.50≤0.03

6、0≤0.035Q345C钢种化学成分项目C%Si%Mn%P%S%Nb%GB/T1591-94≤0.20≤0.551.00-1.60≤0.035≤0.0350.015-0.060冶炼内控0.11-0.150.25-0.451.30-1.50≤0.020≤0.0250.020-0.040精炼内控0.13-0.170.25-0.451.30-1.50≤0.025≤0.0150.020-0.040备注钢中Cr、Ni、Cu残余含量各不大于0.30%。Q345D钢种化学成分牌号要求化学成分（％）CSiMnPSNbQ345DGB/T1591-1994≤0.18≤0.551.00～1.60≤0.030≤

7、0.0300.015-0.060冶炼内控0.11-0.130.20-0.401.35-1.50≤0.020≤0.0250.020-0.040精炼内控0.13-0.170.20-0.401.35-1.50≤0.025≤0.0200.020-0.040注：钢中Cr、Ni、Cu残余元素含量各不大于0.30%。Q345E钢种化学成分牌号要求化学成分（％）CSiMnPSNbQ345EGB/T1591-1994≤0.18≤0.551.00～1.