?榫槽面法兰
... 钢制管法兰类型 types for steel pipe flanges gb/t 1-pn6mpa(16bar) 榫槽面法兰 tongue and groove flange 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 ...