... -5-10-12-14-16-18-20Mainly used in boiler pipe & welded pipeCold Rolled CoilQ195, Q215, Q235, Q275, Q345ASTM,GB, ... -19990.5-200mm, 6-1240mmUsed in general and mechanical structure Alloy Steel PipeDin2391 17 Cr3, ST52, A335P11,P5,P910,P22, ST37, STK400GB5310 ... used in chemical equipment,fertilizer equipment and pipelines under high pressure or high tempretureOil casing pipeAPI J55, API K55, API L80, API ...