... Flange,Flat Flange,Slip-on Flange,Welding Neck Flange,Long Welding Neck Flange,Blind Flange,Stocket Welding,Thread Flange,Screwed Flange,Lap ... 347H,S1803,904L)4Appactions range:Petroleum,smelting,foodstuff,power,papermaking,chemical,medical equipment,aviation,boiler heat exchanger,and other fields.5 ... can be designed and satisfied for customers special requirements. welding stainless steel flanges