... structures,producing all kinds of conventional weapons:the barrel, shells and so on.Structural Steel PipeCr5Mo, Cr9Mo, 15CrMo, 35CrMo, 12Cr1MoV ... 426mm, 6-40mmMainly used in chemical equipment,fertilizer equipment and pipelines under high pressure or high tempretureOil casing pipeAPI ... as well as green house tubes for different planting and breeding business.Line PipeAPI J55-API P110,API K55, API N80 ...