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　　Forged steel is an alloy of carbon and iron. Manufactured by a series of compression under an extremely high pressure, steel forgings normally have less surface porosity, finer grain structure, higher tensile strength, better fatigue life/strength, and greater ductility than any other steel processing.

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　　The process begins with starting stock, usually a cast ingot (or a "cogged" billet which has already been forged from a cast ingot), which is heated to its plastic deformation temperature, then upset or "kneaded" between dies to the desired shape and size.

　　Steel forging can be classified into three categories depending upon the forming temperature:

　　(1.) COLD FORGING OF STEEL

　　The forging temperature is at room condition, self-heating up to 150 degrees Celsius due to the forming energy. It results in low formability and needs high forming forces.

　　(2.)HOT FORGING OF STEEL

　　The forging temperature is between 950 and 1250 degree Celsius, above the recrystallization temperature. It results in good formability and requires low forming forces.

　　(3.)WARM FORGING OF STEEL

　　The forging temperature is between 750 and 950 degrees Celsius. It leads to limited formability and requires higher forming forces than for hot forging.

　　Forging can create a myriad of sizes and shapes with enhanced properties when compared to castings or assemblies.