CAST-IRON MELT PROCESSING METHOD Russian patent published in 2012 - IPC C21C1/08 

FIELD: metallurgy.

SUBSTANCE: method involves cast-iron melting in melting unit, or charging of liquid cast-iron to melting unit, heating of cast-iron to 1460-1560°C. To the melt heel there supplied are granules of carbonic acid diamide (carbamide) in quantity of 0.1-0.5% of the melt weight at simultaneous melt mixing. Diadime decomposition products are dissolved in cast-iron melt. As original cast-iron for such processing in melting unit there can be used liquid cupola iron the carbon content in which is usually 2.9-3.3 wt %. In addition, carbonisation of cast-iron melt supplied to the melting unit from cupola furnace is performed prior to processing. Melt is carbonided till carbon content in cast-iron is 3.4-4.2 wt %.

EFFECT: higher hardness, ultimate strength, impact strength and relative wear resistance of cast-iron.

2 cl, 1 dwg, 1 tbl, 1 ex