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It is a treatment performed after hardening to decrease the fragility of the steel

It reaches an intermediate temperature (550-680 ° C) to obtain the right compromise between hardness, mechanical strength and toughness.

A Sorbitic structure is thus obtained, that is, a mechanical mixture of Ferrite and small globules of Cementite

The fragility of the treated piece decreases significantly, but the steel still has good resistance and is not excessively tensioned internally, which offers it an acceptable plastic reserve.
  • decrease the fragility of steel
  • intermediate temperature 550-680 ° C
  • hardness, mechanical strength, toughness