SAE 8620 is a low-alloy steel that is widely recognized for its excellent case-hardening properties, combining high core strength and toughness with a hard, wear-resistant surface. This steel contains nominally 0.2% carbon, 0.55% manganese, 0.5% chromium, and 0.2% molybdenum, contributing to its well-balanced mechanical properties. SAE 8620 is typically supplied in the annealed condition and can be carburized and hardened to produce a tough, ductile core and a hard, wear-resistant surface layer.

This makes it ideal for components that require a durable surface and the ability to withstand high stress and impact, such as gears, camshafts, shafts, bushings, and other automotive and heavy machinery parts. The alloy's good machinability and weldability, combined with its excellent fatigue and impact resistance, make it a preferred choice for applications requiring high performance and reliability. Its versatility and robust properties ensure that SAE 8620 is a valuable material in the manufacturing and engineering sectors.