Isothermal annealing for raw material

Standard – UNI 10990
Typical Materials – Low-alloy steels such as 20MnCr5, 18NiCrMo5, 16MnCr5, 20NiCrMo2, etc.
Achievable Metallurgical Characteristics – Hardness of 140-190HB, with a ferritic-pearlitic microstructure.

Isothermal annealing is a preliminary process applied to raw parts after forging to standardize the hardness and microstructure of the components. Additionally, the process improves the workability of the parts.

The process involves heating the material to austenitizing temperatures, typically above 920°C, with holding times sufficient to ensure thorough heating of the sections. This is followed by controlled cooling in a furnace to temperatures between 600 and 650°C, where the material is held for a specified duration.