By this process, the strength of unalloyed steels with a carbon content of generally 0.2 to 0.6% in most cases can be changed in a wide range.
In spite of the low carbon content, those steels can reach higher strength values with higher toughness at the same time.
Proceedings:
1. Heating of the material according to the hardening temperature in furnaces or melting baths between 700 °C to 860° C.2. Quenching in water or oil to lukewarm.
3. Tempering according to the desired properties at temperatures between 360°C and 670°C and cooling down to lukewarm.
A high tempering temperature decreases the strength and increases the toughness! |
Which properties shall be reached by hardening and
tempering?
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