... ,Material:Q195,Q215,Q235 3,Thickness:1.0-7.25mm steel pipe , square steel 1,Stndard:GB/T 3094-2000 2,Material:Q195,Q215 ... ,Q235 3,Thickness:1.0-7.25mm Typesquare steel pipe 15*15mm~200*200mm ,20*30mm~120*80mmWall thickness1.0 ... quality system authentication.2,Special design can according to requirements. square steel