... WT: 2mm~25mm Standard:ASTM A312, D3/T3 GUOBANG STEEL have Pipe and Pipe Fittings process workshop,ISO9001:2008,PED97/23/EC,and ... /309H, 310S, 321/H, 347H,316LMod,310MoLN ,253MA,254SMO ect. Duplex Material: S31803, S32750, S32760,S32205,17-4PH etc Special Material ... /800H/825, Inconel 600,625,718 etc. Production Size:OD:1/8''-10" 10.3mm-273mm Production Standard:ASTM: A213, A269 ...