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high pressure boiler pipe material: 20g, 20mng, 25mng, 15crmog, 12cr2mog, 12cr1movg, 10crmo910, sa106b, sa106c, sa335 p5, sa335 p11, sa335 p12, sa335 p22, sa335 p91, sa335 p92, st45.8, 15mo3, 13crmo44, 10crmo910, 15nicumonb5-6-4, etc. technical standard: gb3087, gb5310, a...
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