8620 (20NiCrMo2)
This steel is used in heavily stressed components such as gears, pins, shafts, switch housings, cold-forged and extruded piston pins, chain links, and similar parts in machinery and automobiles. It is also suitable for case hardening and nitriding (surface hardening) processes. It is a flexible structural steel that is soft and tough in the core, while the surface is hard, wear-resistant, and preferred for impact applications.
5120 (20MnCr5)
This steel is used in rollers, gears, shafts, machine parts, piston shafts, discs, chain links, and gears, as well as in extrusion parts and bearing housings in impact-absorbing areas. It is suitable for case hardening and nitriding processes. The outer surface is hard while the inner surface is softer, which helps absorb impacts.
5120 (16MnCr5)
This steel is used in parts for medium-stressed transportation vehicles, machine tools, and construction machinery, such as gears, universal joints, shafts, pins, bushings, control components, and similar parts. It is a flexible structural steel that is soft and tough in the core, while the surface is hard, wear-resistant, and preferred for impact applications. Additionally, it is suitable for case hardening and nitriding heat treatment processes.
