Carbon Steel pipe flange Standard : ANSI,DIN,GOST,etc Type of Flange: WN, SO, BL Process : Forged ISO BV SGS Carbon Steel pipe flange blind flange/ WN flange/SO flange flanges ansi Standard: ANSI, DIN, GOST etc.Material: A105, Rst37.2, 304, 316, 316L, etcType: Slip-on, Welding Neck, Blind, Threaded, etc.Surface:Rust-preventative oilProcessing: ForgingOuter packing: Poly-wooden case or Pallet