METHOD OF PRODUCING HIGH-MANGANESE STEEL SHEETS WITH IMPROVED MECHANICAL PROPERTIES Russian patent published in 2019 - IPC C21D8/02 C21D6/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, in particular to deformation-thermal treatment of metals, and more specifically to a method of producing sheets from austenitic high-manganese TWIP steels with package defect energy of 20 to 50 mJ/m², and can be used in automotive industry for production of vehicle bearing structures. Method includes homogenization annealing of cast billet at temperature of 1,150 °C for 1 hour with subsequent cooling, subsequent hot rolling at temperature of 1150°C with total reduction 60±5 % with cooling. Then second hot rolling is carried out at temperature of 1100°C with total reduction 60±5 %, after which hot rolling is carried out in the temperature range of 700–800 °C with total reduction 60±5 % and subsequent cooling.

EFFECT: disclosed method enables to maintain plasticity of high-manganese steels with package defect energy of 20 to 50 mJ/m² by parameter relative elongation to failure of not less than 50 % increases strength of steel to value of not less than 1,010 MPa due to formation of structure capable of twinning, as well as reduce load on rolls of rolling mills in order to prevent excessive wear of equipment.

1 cl