The flange: Material: 1.stainless steel 316ï¼?316L, 304, 304L, etc 2.WCB Pressure classes: 0.6mpa ~ 32Mpa, 150Lb ~ 2500Lb, pn0.25-pn42.0 Application: boiler and pressure vessel, petroleum, chemical industry, shipbuilding, pharmacy, metallurgy, machinery, food and other industries.