Regal Sales Corporation is one of the recommended Stainless Steel 304 Flanges Manufacturer In India. Our ASTM A182 F304 Stainless Steel Flanges also known as 'A2 Flanges' or commercially as '18/8 Flanges'. SS 304 Blind Flange is the most common flanges use in industries. Stainless Steel 304 Slip on Flanges contains 18% chromium and 8% nickel. The molybdenum is added In Stainless Steel UNS S30400 FLange to help resist corrosion to chlorides in sea water and dilute acids.