... : DIN17223, EN10270-1, JIS G 3521, ASTM A227, GB4357-89 Tensile strength: B,C grade/SM, DM; SH, DH/SWB, SWCSurface:smooth ... .Min.order quantity:1 ton.Quality inspection of each coil: tensile strength, tolerance, surface smooth, torsion, bending, winding, ellipse, etc.Certificate ...