Rules of decomposition of austenite of low-pearlite steels in continuous cooling

The kinetics of the transformation of the austenite of 12G2FR steel and, for comparison, of 09G2FB steel in continuous cooling were investigated. The chemical analyses of these steels are presented. The thermokinetic curves were constructed on an AD-73 dilatometer. Alloying of steel with up to 0.005% boron increases the stability of the austenite and provides higher hardenability of the steel. Heat treatment of plates of the steels after controlled rolling provides an increase in the strength properties from 560 to 610-640 MPa with satisfactory plasticity and impact strength