We are offering seamless steel pipe the material:alloy asme sa335-p11, asme sa335-p12.asme sa335-p91.Carbon steel asme sa-106a, asme sa-106b, asme sa-106c.Stainless steel asme sa-268.My company perennial with a large number of steel pipe inventory, dn15-dn600 diameter, various wall thickness, material. there are china standard, usa standard, japanese standard etc. can sell according to the user's actual needs.