弯头三通异径管法兰管帽承插件补偿器泵管沟槽管件合金管无缝管直缝管螺旋管16Mn.12CrMo.15CrMo.12Cr1MoV.P91.P22.A350.A335.20#.10#.20g.A234.A53.A106.A105.AP15L.ASME.ANSI.GB/T12459.GB8162.GB/T9711.1.DIN.BS.ISO 电标.石化.标准