Effect of critical rolling reduction on chemicothermal treatment processes

Conclusions

• 1. The presence of large grains on the surfaces of parts made from plates produced at the Zaporozhstal' Factory and annealed at 800\dg is due to the critical degree of rolling reduction.

• 2. The critical degree of rolling reduction leads to grain growth as the result of secondary recrystallization in the process of annealing at 800°.

  It is recommended that plates be subjected to recrystallization annealing at 600°.

• 3. Large grains on the surface after plastic deformation with the critical degree of deformation and annealing at high temperatures reduce the depth of carburizing and carbonitriding and reduce the degree of saturation.