MANUFACTURING METHOD OF HIGH-STRENGTH NANOSTRUCTURED STEEL REINFORCEMENT Russian patent published in 2012 - IPC C21D8/08 C21D9/52 C22C38/54 B82Y40/00 B82B3/00 

FIELD: metallurgy.

SUBSTANCE: manufacturing method of high-strength steel reinforcement involves melting of steel of the specified chemical composition, in which total content of Cr+Ni+Cu<0.14 is maintained, and ratio of aluminium to boron (Al/B) is within 10 - 20; heat treatment of hot-rolled rod is performed by heating in the furnace up to 900-940°C with further isothermal hardening during 85-110 seconds in molten lead at temperature of 530-560°C and final water cooling, and drawing of hot-rolled rod is performed with total shrinkage of 57-62%. Invention will allow obtaining metal nanostructure after heat treatment, which consists of ferrite-carbide mixture with interlamellar distance of 80-180 nm and small quantity of structurally free ferrite in the form of islands along grain boundaries. Strength of not less than 1570 N/mm², yield strength of not less than 1400 N/mm² and relative breaking elongation of not less than 6% is provided in cold deformed high-strength reinforcement.

EFFECT: improving strength.

1 dwg