... structures,producing all kinds of conventional weapons:the barrel, shells and so on.Structural Steel PipeCr5Mo, Cr9Mo, 15CrMo, 35CrMo, ... , 6-40mmMainly used in chemical equipment,fertilizer equipment and pipelines under high pressure or high tempretureOil casing pipeAPI ... , A335P11, A335P91, T91, 12Cr2MoWVTiB, WB36, SA106, ST45.8- and so on.GB3087-199910-426mm, 2-40mmFor industrialboilers of low ...