环: ring; hoop连接: connect; fit together; link; ...面对: face; confront焊: weld; solder环带: annule; girdle; annulus; cli ...颈: neck松: pine钢: sharpen; strop; whet制管: tubulation法兰: flange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环连接面对焊钢制管法兰: steel pipe welding neck flanges with ring-joint face for pn 0mpa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环连接面带颈承插焊钢制管法兰: hubbed socket welding steel pipe flanges with ring-joint face环连接面带颈平焊钢制管法兰: hubbed slip-on-welding steel pipe flanges with ring-joint face for pn 0mpa环连接面钢制管法兰盖: steel pipe blank flanges with ring-joint face for pn 0mpa环连接面整体钢制管法兰: integral steel pipe flanges with ring-joint face for pn 0mpa凹凸面平焊环板式松套钢制管法兰: loose plate steel pipe flanges with weld-on collar with male and female face突面平焊环板式松套钢制管法兰: loose plate steel pipe flanges with weld-on collar with raised face榫槽面平焊环板式松套钢制管法兰: loose plate steel pipe flanges with weld-on collar with tongue and groove face板式翻边松套钢制管法兰: loose plate steel pipe flanges with lapped pipe end for pn 0mpa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