... , 321 2)Standards: GB, AISI/ASTM, JIS, BS, DIN high pressure seamless stainless steel pipe1)Grade: 304, 304L, 316, 316L, 321 ... , ASTM A213, ASTM A269,DIN17440,DIN17224,DIN17458ApplicationChemical and petrochemical industry, Oil and gas applications, Mechanical and plant engineering and constructionSurfacePickled/polished ...