Flange carbon steel Typically made from materials that contain primarily iron and carbon, with small amounts of other elements such as manganese, silicon, and sulfur, offer excellent strength and durability, making them suitable for a wide range of applications. Code Nominal Size (mm) Pressure Rating Type 7355059 80 PN16 slip-on 7355058 65 PN16 slip-on 7355057 50 PN16 slip-on 7355056 40 PN16 slip-on