... different shapes, high quality 3 Material: carbon steel& alloy steel Products DetailesName square seamless steel pipeTechiqueCold Drawn/cold rolledStandard GB/T8162,GB/T8163 ... JIS G3444, ASTM A 53, DIN1629 and otherwiseMaterialCarbon Steel of 20#, Q235,35#,45# ,16Mn, A53 GR.B,A106 Gr.B, ... ST45, CK45Alloy steel of 20Cr, 40Cr, 20CrMnTi, 20CrMo, 42CrMo,40MnMoV ...