... alloy steel tube Size:1/4"-32"*Sch5-Sch160XXS Standard:GB ASTM JIS DIN Certificate:API ISO Cangzhou Qiancheng Steel ... 6JISSEAMLESSSTPL380, STPL450, STPL690ASTMWELDEDA671-CC60, CC65, CC70 etc..ALLOY STEEL PIPEASTM/ASMESEAMLESSA/SA335-P1, P5, P11, P12, ... GR.1, GR.6JISSEAMLESSSTBL380, STBL450, STBL690ALLOY STEEL TUBEASTM/ASMESEAMLESSA/SA213-T5, T9, T11, ... ) DIN17175 10CrMo910 alloy steel tube