The main steel grades include 304, 304L, 321, 316, 316L, 347H, 317L, 310S and 904L. The production of stainless steel pipes is in compliance with the standards of GB2270-80, GB/T14975-2002, GB/T14976-2002, GB/T13296-91, GB5310-95, GB9948-88, ASTM A213, ASTM A269, ASTM A312 and JIS G3463.