牌号等级化学成分（质量分数）（%）Q355NH138-2122-3369Q355NHC≤MnSi≤P≤S≤VNbTiA1≥Q355nhAO.160.80～1.500.550.0450.0450.02～O.150.015～O.060O.02～0.20Q355NHB0.040O.040Q355NHAO.201.00～1.600.550.045O.0450.02～O.150.015～O.0600.02～O.20Q355NHBO.040O.040Q355NHC0.0350.035O.015Q355NHDO.180.030O.030O.015Q355NHE0.025O.025O.015)