1)GB700-88, Q235 2)GB1591-1994, Q345 3)JIS G3101, SS400 Spec.GradeStandard SizeCarbon Structual SteelQ195-Q235GB3274-19882.0-100mmX1000-2000SS330, SS400JIS G31032.0-100mmX1000-2000Quality Carbon Structual Steel08,20,45,55GB711-19885-100mmX1500-3000S45C,S50C,S58CJIS G31065-100mmX1500-3000Low Alloy and High Strength Structual SteelQ295,Q345,Q390,Q420GB3274-19865-100mmX1500-3000SM400,SM490,SM520, ...