METHOD FOR PRODUCING SHEETS OF AUSTENITE IRON-CARBON-MANGANESE STEEL OF HIGH STRENGTH, EXCELLENT DUCTILITY AND CAPABILITY TO COLD UPSETTING, SHEETS PRODUCED BY SUCH METHOD Russian patent published in 2008 - IPC C21D8/04 C21D6/00 C22C38/58 

FIELD: production of hot rolled sheet of austenite iron-carbon-manganese steel.

SUBSTANCE: in order to manufacture sheet of improved deformability and ductility, sheet is produced whose strength exceeds 900 MPa, for which value of strength multiplied by elongation at rupture exceeds 45000 and whose chemical composition contains, mass%: carbon, 0.5 - 0.7; manganese, 17 - 24; silicon, less than 3; aluminum, less than 0.050; sulfur, less than 0.030; phosphorus, less than 0.080; nitrogen, less than 0.1; and in addition one or several elements such as chrome, less than 1; molybdenum, less than 0.40; nickel, less than 1; copper, less than 5; titanium, less than 0.50; niobium, less than 0.50; vanadium, less than 0.50, iron and inevitable impurities, the balance. Recrystallized doze of steel exceeds 75%; doze of separated carbides per unit of steel surface is less than 1.5%. Mean size of steel grains is less than 18 micrometers.

EFFECT: enhanced deformation capability and ductility of steel.

10 cl, 2 ex, 4 tbl, 12 dwg