Regenerative Heat Treatment of Low Alloy Cast Steel

Cylinder and valve chamber castings of large power steam turbines are usually made of low alloy Cr Mo V and Cr Mo cast steels. Forming of the microstructure and mechanical properties of cast steels takes place through heat treatment, thus far mostly consisting of normalizing and tempering. As a result of such a treatment the cast steels of diverse wall thickness reveal microstructures from ferritic – pearlitic to bainitic – ferritic with various ferrite, pearlite and bainite amount.