BIMETALLIC INGOT OBTAINING METHOD Russian patent published in 2013 - IPC C22B9/18 

FIELD: metallurgy.

SUBSTANCE: proposed method involves arrangement of a steel workpiece with a gap from a crystalliser wall as the main layer of a bimetallic ingot; consumable electrodes from corrosion resistant steel are installed in that gap, a slag bath is built and consumable electrodes are molten in it with formation of a clad layer, the thickness of which is 5-30% of total thickness of bimetallic ingot at values of electric resistance of the slag bath at the interval of 3.5-5.0 mOhm, further slow cooling of the ingot; at that, a low-alloyed steel workpiece is used, which contains the following, wt %: carbon 0.05-0.25, silicon 0.01-0.80, manganese 0.20-1.60, phosphorus of not more than 0.025, sulphur of not more than 0.020, arsenic of not more than 0.015, iron and inevitable impurities are the rest, and as inevitable impurities, there used is one or several elements chosen from the group containing zinc, stannum, plumbum, antimony in the amount of 0.001-0.02% each.

EFFECT: invention allows increasing strength and uniformity of connection of layers, corrosion resistance and quality of clad layer surface at maintaining strength characteristics, impact strength of bimetallic rolled metal at normal and decreased temperatures, uniform thickness of layers.

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