Forging vs Casting: Differences, Properties & Which to Specify for Critical Metal Components
Forging shapes metal by applying compressive force to a solid billet, aligning the grain flow along the part's contours and producing higher strength, toughness, and fatigue resistance. Casting shapes metal by pouring molten alloy into a mold, allowing more complex geometries but with a higher risk of internal porosity. Forged components are generally specified for stress-critical, safety-critical parts; cast components suit complex shapes where extreme mechanical loading is not the primary concern. What Is Forging? Forging is a metal-shaping process where a solid billet is deformed under compressive force — using a hammer, press, or upsetting die — until it takes the desired shape. The metal is worked below or near its recrystallization temperature (hot forging) or at room temperature (cold forging), depending on the alloy and the required properties. Because the material is never melted, forging preserves and reshapes the internal grain structure. The grain flow bends to follow...