... . Type:Slip-on flanges,Blind flanges, Spectacle flanges, Plate flanges,TG flanges, Lap joint flanges,Welding neck flanges, ... .8. Production process : raw material--cutting--heating--forging--heat treatment--maching-- inspection-washing-packaging-Ex-work.9. Mill ... party16. Used for : petroleum,chemical,power,gas,water,linepipe, heat exchanger,shipbuilding,construction,etc.17. Tolerance:not less than +_8% ...