Effect of desulphurization on the fracture toughness of structural steels at climatic temperatures

The results show that desulphurization of 09G2 and 10KhSND steels by blowing silicocalcium into the ladle and by treatment in the ladle with a synthetic slag with the sulphur content varying from 0.04–0.04 to 0.003–0.005% increases several times the impact toughness, 1.2–1.5 times the critical stress intensity factor, reduces the temperature of transition from ductile to quasibrittle failure, and increases the critical crack opening displacement two to six times in the temperature range 213–293 K. Desulphurization is an important method of increasing the brittle failure resistance of structural steels at reduced temperatures.Translated from Problemy Prochnosti, No. 11, pp. 14–21, November, 1990.