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Heat treatment of cast steel using normalization and intercritical annealing

Golański G., Stachura S., Kupczyk J., Kucharska-Gajda B.

Archives of Foundry Engineering

2007

Vol. 7, iss. 1

123-126

The paper presents the influence of heat treatment, normalization with subsequent ([alpha]+[gamma]) annealing on the structure and properties of G21CrMoV4-6 (L21HMF) cast steel, long term serviced at the temp. of 540 oC. Applying of heat treatment ensures obtaining of regenerated ferritic – pearlitic structure with pearlite precipitations mainly on grain boundaries. such a structure formed after slow cooling at two-phase range, ensures a significant impact energy growth with mechanical properties similar to the properties after service. It has also been proved that tempering at temperatures recommended by the norm does not always allow to obtain the required minimum impact energy.