钢: sharpen; strop; whet制管: tubulation法兰: flange对焊: butt welding端部: telos凹凸面对焊钢制管法兰: steel pipe welding neck flanges with male and female face for pn 0mpa; steel pipe welding neck flanges with male and female face for pn 5mpa; steel pipe welding neck flanges with male and female face for pn mpa环连接面对焊钢制管法兰: steel pipe welding neck flanges with ring-joint face for pn 0mpa平面、突面对焊钢制管法兰: steel pipe welding neck flanges with flat face or raised face平面对焊钢制管法兰: steel pipe welding neck flanges with flat face for pn 25mpa; steel pipe welding neck flanges with flat face for pn 6mpa; steel pipe welding neck flanges with flat face for pn0mpa; steel pipe welding neck flanges with flat face for pn6mpa凸面对焊钢制管法兰: steel pipe welding neck flanges with raised face for pn 0mpa; steel pipe welding neck flanges with raised face for pn 25mpa; steel pipe welding neck flanges with raised face for pn 5mpa; steel pipe welding neck flanges with raised face for pn 6mpa (bar)gb/t 8-pn 0mpa(bar)突面对焊钢制管法兰: steel pipe welding neck flanges with flat face or raised face榫槽面对焊钢制管法兰: steel pipe welding neck flanges with tongue and groove face for pn 0mpa; steel pipe welding neck flanges with tongue and groove face for pn 5mpa; steel pipe welding neck flanges with tongue and groove face for pn 6mpa钢制管法兰: specification for steel pipe flanges; types and parameters for steel pipe flanges凹凸面对焊环板式松套钢制管法兰: loose plate steel pipe flanges with welding neck collar with male and female face环连接面对焊环带颈松套钢制管法兰: loose hubbed steel pipe flanges with welding neck collar with ring-joint face凸面对焊环松套板式钢制管法兰: loose plate steel pipe flanges with welding neck collar with raised face for pn 0mpa突面对焊环板式松套钢制管法兰: loose plate steel pipe flanges with welding neck collar with raised face突面对焊环带颈松套钢制管法兰: loose hubbed steel pipe flanges with welding neck collar with raised face榫槽面对焊环板式松套钢制管法兰: loose plate steel pipe flanges with welding neck collar with tongue and groove face钢制管法兰类型: types for steel pipe flanges gb/t 1-pn6mpa(16bar)平面钢制管法兰盖: steel pipe blank flanges with flat face for pn 6mpa凸面钢制管法兰盖: steel pipe blank flanges with raised face for pn 0mpa突面钢制管法兰盖: steel pipe blank flanges with flat face or raised faceansi钢制管法兰和附件标准: ansi standard pipe flanges and fittings凹凸面钢制管法兰盖: steel pipe blank flanges with male and female face for pn 0mpa