Forged ASTM A105 pipe flanges contain carbon, manganese, phosphorus, sulfur, silicon, copper, nickel, chromium, molybdenum, and vanadium in the composition. Since other materials have less than 1% composition, these materials are called carbon steels. There are different types such as SA105N blind flanges for closing pipes. Flanges also have good strength properties. The minimum yield strength of the flange is 250MPa and the minimum tensile strength is 485MPa. The material is also very hard, with a Brinell hardness of 187.