Patent ID: 7662247

Claim:
A method of producing a Martensite wear-resistant cast steel with film austenite for enhancement of toughness as follows: said Martensite wear-resistant cast steel with film austenite for enhancement of toughness comprising 0.25˜0.34 wt % C, 1.40˜2.05 wt % Si, 0.90˜1.20 wt % Mn, 1.80˜2.50 wt % Cr, 0.0005˜0.005 wt % B 0.01˜0.06 wt % Ti, 0.015˜0.08 wt % Rare Earth, 0.015˜0.06 wt % Al, less than 0.035 wt % S of impurity element, less than 0.035 wt % P of impurity element, and balance of iron, (1) smelting and casting comprising the following steps: heating the iron alloy in electric induction to form melt; slagging and deoxidizing melt by heating melt to about 1600˜1650° C. and adding Ferro-Titanium; pouring melt into ladle, and when ladle is one quarter filled, rapidly plunging in fine Ferro-Rare Earth and Ferro-Boron particles packed in thin plastic bag into the ladle such that the addition of ferroalloys correspond with the specification of the material specification; and cooling melt to form cast steel (2) heat treatment of cast steel comprising the following steps: normalizing by heating and holding at 1000˜1050° C. for 3˜4 hours, air cooling, holding at 900˜920° C. for 2˜3 hours and water cooling; and tempering by reheating at 200˜230° C. for 2˜3 hours and then air cooling.