Alloy / Carbon steel pipes / boiler tube, all son seamless steel pipes Alloy / Carbon steel pipes / boiler tubeMaterial: EN: S235JR, S235JO, S235J2, S235JR, ... ST37, ST52, S355JR, S355JO, S355J2, 17Cr3, 41Cr4, 25CrMo4, 30CrMo4, 34CrMo4, 42CrMo4 ... , DNV, SGS, BV, etc Alloy / Carbon steel pipes / boiler tube