... A, B, C, ASTM A 333, Gr 1 to 6 Alloy Steel: ASTM A 335, GR P1, P2, P5, P9, P11 ... factor of our success. Our Carbon steel, Stainless Steel, Alloy Steel Pipe and pipe fittings, flanges are mainly used in petroleum, gas,shipbuilding ... , coupling, outlet etc supplying.AS CS SS Pipe, fittings, flangesMaterial: Carbon steel, stainless steel, Alloy steel. Standard: ANSI ASTM DIN JIS GBSize ...