Influence of steel casting’s surface carburizing on corrosion resistance
In paper it is study the influence of surface carburization of castings from steel 10Cr19Ni9L on its corrosion resistance. At all first it is show the different degree of surface carburization of castings at molds from mixture with various binding materials. The content of carbon at surface layers at 4-6 time more, than in initial steel. It are decreased according to deep at internal layers of castings. Because of for inferred rating of castings corrosion resistance was use the method of graphic integration of carburization curves. According to receiving results, the corrosion resistance of the most first carburization layer is only 16% on the base variant. At the limit of carburization layer (1,5-2,5 mm) according to decreasing of carbon content the dates of corrosion resistance of discrete layers and in all casting is increase, but remained lower, than in base variant of casting. In case of on-sided corrosion and admissible wear is 10% from 25 mm casting thickness the corrosion resistance of casting is only 41% from base variant. If admissible wear is the half of casting thickness, the casting corrosion resistance is increase up to 88%.