EFFECT OF ALUMINUM CARBONITRIDES ON THE PROPERTIES OF 17GS-TYPE STEEL

Compositions of carbonitride phases in hot-rolled and normalized 17GS- grade steel containing 0.12 - 0.35% Al have been studied by X -ray dif fractometry. Along with aluminum nitrides, a complex carbonitride Al5C 3N was found in the steel. The conditions of carbonitride formation ar e predetermined by aluminum content in steel, heat-treatment schedule, and thickness of the rolled plate. The formation of the Al5C3N phase is accompanied by the stabilization of the octahedral texture of metal . This decreases the effect of the deterioration of impact toughness w ith increase in plate thickness.