凹凸: concave-convex面带: wear颈: neck承: bear; hold; carry插: stick in; insert焊: weld; solder钢: sharpen; strop; whet制管: tubulation法兰: flange凸面带颈承插焊钢制管法兰: hubbed socket welding steel pipe flanges 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平面带颈承插焊钢制管法兰: hubbed socked welding steel pipe flanges with flat 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榫槽面带颈承插焊钢制管法兰: hubbed socket welding steel pipe flanges with tongue and groove 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凸面带颈平焊钢制管法兰: hubbed slip-on-welding steel pipe flanges with raised face for pn 0mpa平面带颈平焊钢制管法兰: hubbed slip-on-welding steel pipe flanges with flat 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榫槽面带颈平焊钢制管法兰: hubbed slip-on-welding steel pipe flanges with tongue and groove face for pn 0mpa带颈平焊和带颈承插焊铸铁管法兰: hubbed slip-on-welding and hubbed socket welding cast iron pipe flanges突面带颈螺纹钢制管法兰: hubbed screwed steel pipe flanges with raised face凸面板式平焊钢制管法兰: slip-on welding plate steel pipe flanges with raised face for pn 6mpa
