榫槽面对焊钢制管法兰国家标准Steel pipe welding neck flangeswith tongue and groove face1范围本标准规定了公称压力PN为1.6、
榫槽面平焊环板式松套钢制管法兰国家标准Loose plate steel pipe flanges with weld-on collar with tongue and groove face1范
突面平焊环板式松套钢制管法兰国家标准Loose plate steel pipe flanges with weld-on collar with raised face1范围本标准规定了
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