LIGATURE FOR MODIFICATION OF HIGH-STRENGTH CAST IRONS, METHOD OF ITS RECEIVING AND USAGE Russian patent published in 2009 - IPC C22C35/00 C21C1/10 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy field, particularly to magnesium-bearing ligature making practice for high-strength ligatures, used for manufacturing of hard part, for instance automobile crankshaft. Ligature contains, wt %: magnesium 17-20, cerium 0.4-0.6, copper is the rest. In the method in the capacity of integumentary flux it is used powdered baric flux, which is charged on magnesium, copper is fractional introduced: at first 60-70 wt % of its total amount, and then - by 10 wt % by components melting with addition of flux for saving of melt blanket, process is implemented at the temperature 725-800°C, chosen on the basis of binary constitution diagram Mg-Cu, during 40-60 min with conclusive layer induction of refining flux of thickness 1-2 cm and introduction of cerium with solid subsurface mixing of received ligature. Then ligature is crushed for pieces 2-4 kg, after what it is introduced into the cast iron in amount 0.65-0.85 wt % of cast iron weight.

EFFECT: distribution uniformity of alloying ingredients with increased grade of ligature assimilation, hardening and increasing of cast iron wear resistance, stability and safety of its receiving methods and usage, and also cost cutting for energy carriers and cost reduction of used components.

3 cl, 3 ex, 1 tbl