BORON STEEL MAKING METHOD Russian patent published in 2013 - IPC C21D8/02 C21C7/00 C22C38/32 B21B1/46 

FIELD: metallurgy.

SUBSTANCE: following operations are performed: steel making, deoxidation, out-of-furnace treatment, addition of ferroboron and argon blowing through bottom tuyeres, pouring at a continuous casting machine so that a billet is obtained, heating of the billet in a continuous furnace, rolling to the specified profile size; at that, melting and out-of-furnace treatment is performed so that the steel containing the following, wt %, is made: carbon 0.36-0.39, boron 0.001-0.003, aluminium 0.015-0.045, and after the billet is obtained, the content of silicon, manganese, aluminium and titanium is determined; the billet is rolled to the required dimensions; at that, the rolling end temperature is specified based on the required hardness value.

EFFECT: obtaining the specified chemical composition of steel; providing the required hardness penetration value; improving cutting ability and the yield ratio.

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