METHOD OF REINFORCEMENT STEEL MANUFACTURING Russian patent published in 2015 - IPC C21D8/08 C21D9/52 C22C38/54 

FIELD: metallurgy.

SUBSTANCE: method of reinforcement steel manufacturing includes making of steel containing, wt %: carbon 0.78-0.82, manganese 0.70-0.90, silicon 0.20-0.30, sulphur 0.010 maximum, phosphorus 0.025 maximum, chrome 0.20-0.30, nickel 0.10 maximum, copper 0.10 maximum, aluminium 0.005 maximum, boron 0.0010-0.0030, nitrogen 0.008 maximum, titanium 0.005% maximum, iron - rest, at that total content Cr+Mn+Ni+Cu < 1.4 is maintained, and ratio Al/B within range < 1.67. Heat treatment is performed by heating in furnace to 900-940°C with further isothermal hardening for 85-110 s in lead melt at temperature 530-560°C and final cooling with water. Cold drawing of roll is performed with total shrinkage 57-62%.

EFFECT: production of cold-worked high strength, with high yield strength and relating elongation at break at least 6%.

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