Forging process Forged steel refers to various forging materials and forgings produced by forging methods. Cast steel is the steel used for casting castings. 2. Purpose Forged steel is often used in the manufacture of some important machine parts. Cast steel is mainly used for the manufacture of some parts with complex shapes. The parts are difficult to be forged or formed by cutting and require high strength and plasticity. 3. Performance Forged steel can withstand large impact forces, and its plasticity, and toughness. Other mechanical properties are also higher than those of cast steel parts. Cast steel materials have many impurities, brittle materials, poor strength, large internal stress. And loose internal organization.