... -on flanges are easy to use in fabricated applications.Size1/2"-48" DN15--DN3000MaterialCarbon steel, stainless steel and alloy steel( ... ,etc.Surface Treatment Transparent oil, rust-proof black oil or hot galvanized.Usage:Petroleum, chemical, power, gas, metallurgy, shipbuilding, construction, ... ,China Factory Certificate Test Equipment Production Equipment For sale PN 1.0 slip on carbon steel flange