1.Size:1''-52''(25mm-1300mm) 2.material: carbon steel,stainless steel and alloy steel flanges. 3.According to the drawings Use:using forming a ... ,2A50,5A05,2A10,6061,6063,2A50,5154. carbon steel, stainless steelSurface treatment: Transparent oil, rust-proof oil. Forging flange stainless steel A105,304,304L,316