About Cold Working

about cold working

Cold working or cold forging is accomplished on specially designed presses using hard steel dies that shape metal material slowly under thousands of tons of force at or near room temperature.

Cold working compresses alloy grain structure to a fine, dense condition that improves its tensile and yield strength but without the distortion or scaling effects found in hot forging.

Cold worked parts generally require less post forge polishing to achieve a smooth surface. It is an ideal process for manufacturing small parts such as parachute and climbing hardware.

Martensitic stainless steel alloys of the 400 series require heat treatment to improve hardness. Austenitic alloys such as 316L are less costly and are hardened only by cold working. The cold work process densifies the material by crowding together its grains to a finer structure for better fatigue resistance.

Cold working can increase material temper to quarter hard, half hard, full hard, spring or extra spring with improved finish properties and higher corrosion resistance over Martensetic alloys.

Compare these alloys:

Hot forged 316L = 560KN/mm2
Hot forged 17.4 = 1000KN2
Cold worked 316L = 1000KN2