Galvanized Pipes

1. MaterialGB/T 6728: Q195, Q215, Q235, Q345B;ASTM A500: Grade A, Grade B, Grade C;EN 10219: S235JR, S275JR, S355JR;AS 1163: C250, C350, C450;JISG 3466: STKR400, STKR4902. Produ...