榫槽: tongue-and-groove; mortise面带: wear颈: neck平: flat; level; even; smooth焊: weld; solder钢: sharpen; strop; whet制管: tubulation法兰: flange平面带颈平焊钢制管法兰: hubbed slip-on-welding steel pipe flanges with flat face for pn 0mpa凸面带颈平焊钢制管法兰: hubbed slip-on-welding steel pipe flanges with raised face for pn 0mpa突面带颈平焊钢制管法兰: hubbed slip-on-welding steel pipe flanges with flate face or raised face凹凸面带颈平焊钢制管法兰: hubbed slip-on-welding steel pipe flanges with male and female 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榫槽面带颈承插焊钢制管法兰: hubbed socket welding steel pipe flanges with tongue and groove 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凹凸面带颈承插焊钢制管法兰: hubbed socket welding steel pipe flanges with male and female face环连接面带颈承插焊钢制管法兰: hubbed socket welding steel pipe flanges with ring-joint face平面带颈承插焊钢制管法兰: hubbed socked welding steel pipe flanges with flat face for pn 0mpa凸面带颈承插焊钢制管法兰: hubbed socket welding steel pipe flanges with raised face for pn 0mpa突面带颈承插焊钢制管法兰: hubbed socket welding steel pipe flanges with raised face榫槽面钢制管法兰盖: steel pipe blank flanges with tongue and groove face for pn 0mpa榫槽面整体钢制管法兰: integral steel pipe flanges with tongue and groove face for pn 0mpa; integral steel pipe flanges with tongue and groove face for pn mpa; integral steel pipe flanges with tongue and groove face for pn0mpa; integral steel pipe flanges with tongue and groove face for pn6mpa凸面带颈螺纹钢制管法兰: hubbed screwed steel pipe flanges with raised face for pn 0mpa; hubbed screwed steel pipe flanges with raised face for pn 5m; hubbed screwed steel pipe flanges with raised face for pn 6mpa突面带颈螺纹钢制管法兰: hubbed screwed steel pipe flanges with raised face