STRUCTURAL-STEELS - OBTAINING HIGH-STRENGTH WELDABLE STEELS WITH BAINITE STRUCTURE USING THERMOMECHANICAL TREATMENT

In this paper, we present the results of investigations which form the basis for development of high-strength weldable bainite steels obtained using in-line thermomechanical treatment in the rolling mill and not requiring heat treatment with special heating. The thermomechanical treatment involves controlled rolling followed by regulated cooling. In order to achieve high strength properties than in steels with ferrite-pearlite structure, the alloying and cooling conditions for rolling in the thermomechanical treatment cycle must ensure that low-temperature austenite transformation products be obtained with a fine original austenite grain.