1.We'r checked by SGS, B&V 2.Material:UNS NO2200 UNS NO2201 3.Size:OD10-220*Thk 0.5-10xL 4 ... seamless tubeGrade of materialNi200,Ni201, Ni205, N4,N6UNS NO2200, UNS NO2201, UNS NO4400StandardASTM B161, ASTM B163Size (MM)OD6-219*Thk0.4-12 ... Co., Ltd.(Korea), ZAN (Japan). GE ( USA) etc. ASTM B163 UNS NO 2200 Nickel Seamless Tube