... 10-12-14-16-18-20Mainly used in boiler pipe & welded pipeCold Rolled CoilQ195, Q215, Q235, Q275 ... high pressure or high tempretureOil casing pipeAPI J55, API K55, API L80, API N80, API P110GB9948-2000114-273mm ... .5-16mmWidely used in the construction,pipe of industrial,water pipe,fence equipment,telecommunication tubes as well ... PipeAPI J55-API P110,API K55, API N80,etcGB,ASTM,API5L2.1-110mm,10.3-508mmUsed ...