METHOD OF PRODUCTION OF LOW-CARBON STEEL WITH IMPROVED CORROSION STABILITY Russian patent published in 2019 - IPC C21C7/00 C21C7/10 C22C38/18 

FIELD: metallurgy.

SUBSTANCE: invention relates to the field of ferrous metallurgy and can be used to obtain low-carbon steels with increased corrosion resistance for the production of rolled strip. In the method, the metal is smelted in a steel-smelting unit, the production of liquid metal in the steel-teeming ladle, the ladle treatment of the liquid metal in the furnace-ladle (FLI) and the steel degassing (SDI) installations, and the steel casting. With the release of the metal in the steel teeming ladle, it is deoxidized and alloyed, and in the steel degassing process, a deoxidizing agent is additionally introduced in the form of aluminum and alloyed in the form of manganese, ferrochrome, ferrotitanium and ferrosilicon, while the aluminum content in the metal before processing on the FLI is set to no more than 0.04 %, and after the processing is completed – not more than 0.03 %, the amount of aluminum introduced into the SDI does not exceed 0.045 %, and at the end of processing on SDI, the aluminum content in the metal is set to not more than 0.02 %, while ferrotitanium is introduced not less than 15 minutes before the end of processing on the SDI in an amount sufficient to produce in the metal before casting the titanium content is not less than 0.015 %, after which calcium is introduced in an amount of not less than 20 g per ton of steel with a sulfur content of not more than 0.002 %, and the duration of the treatment with SDI is 70–100 minutes.

EFFECT: invention allows to produce slabs for the production of rolled strip with a low corrosion rate while maintaining a high level of strength and plastic characteristics.

1 cl, 1 tbl