High quality carbon steel forged flange 1. Types:SO,WN,PL,BL,SW 2. Standard :ANSI,ASME,ASTM 3. Size:3/8"-96" High quality carbon ... steel forged flange Manufacturer 1. Types:SO,WN,PL,BL,SW 2 ... 9. Rustproof treatment:a) Lightly oiled b) Galvanized c) Painting with different colors d) Just keep the flanges dry and clean ...