METHOD FOR HEAT TREATMENT OF HYPOEUTECTOID STEEL

摘要

The invention relates to metallurgy, namely to a method for heat treatment of proeutectoid low-alloyed steel. A method comprises the heating of this steel to temperature of Ac+ (30-50 ºC), its soaking calculated for 2 minute on section, cooling to 450-550 ºC, heating and soaking in inter-critical temperature range, cooling on air to room temperature. Further, drawback is additionally carried out after cooling at air. The invention provides the increasing of ultimate stress at shattering, ductility and impact elasticity simultaneously.