... Use scope 1Common carbon steel plate Q235 A,B,C,DQ255 A,BQ275 A,B 6-80 mmGB700-1988Steel structure, City construction, mechanical ... production 2Low alloy steel plate Q345 A,B,C,D 6-100 mm GB/T1591-1994Steel structure, vehicle production, mechanical ... -strength structure steel plate Q390A/B/C/D/E Q420A/B/C/D/E Q460C/E/E 6-60 mm GB/T1591-94Steel ...