METHOD OF PIPE STEEL PRODUCTION Russian patent published in 2015 - IPC C21C7/64 C21C7/72 

FIELD: metallurgy.

SUBSTANCE: metal output to steel ladle is performed for 4-8 minutes at the metal temperature at least 1650°C, during output aluminium is added in amount of 2.1-2.5 kg/t of steel at carbon content in metal prior to the output up to 0.055% and in amount of 1.7-2.1 kg/t of steel at carbon content in metal prior to output at least 0.055%, and lime in amount of 4.0-6.1 kg/t of steel at sulphur content in cast iron up to 0.025% and in amount 6.1-7.5 kg/t of steel at sulphur content in cast iron at least 0.025%, and during out of furnace treatment the metal blasting by argon is performed for at least 50 minutes, and metal is treated by calcium containing chemical on the basis 0.05-0.5 kg of calcium per 1 ton of steel.

EFFECT: invention reduces content of non-metallic inclusions in the pipe steel and increases its corrosion resistance.

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