Casting piece steel for railway vehicle swing bolster side frame and preparation method thereof

Abstract

The invention discloses casting piece steel for railway vehicle swing bolster side frame and a preparation method thereof. The casting piece steel comprises the following chemical components in percentage by weight: 0.23%-0.29% of C, 0.30%-0.50% of Si, 0.80%-1.00% of Mn, not greater than 0.030% of P, not greater than 0.030% of S, not greater than 0.30% of Cu, 0.20%-0.50% of Ni, 0.30%-0.40% of Cr, 0.020%-0.050% of Al, not greater than 0.10% of rear earth, and the balance of Fe and inevitable impurities. The preparation method of the casting piece steel comprises the following steps: firstly, adding materials corresponding to C, P, S, Cu and Ni into an eccentric-bottom electric arc furnace, melting the materials into molten steel, and controlling the carbon content in the molten steel to not less than 0.50%; carrying out oxidation and decarbonization by using oxygen gas, discharging steel when the temperature of the molten steel is not less than 1630 DEG C, adding refining slag, lime, a deoxidizing agent, manganese-iron alloy, silicon-iron alloy and chromium-iron alloy into every ton of steel ladles while the steel is discharged to the steel ladles, and then, carrying out molten steel refining; after casting a casting piece, feeding the casting piece steel into a gathering-releasing chain type thermal treatment line for carrying out normalizing to obtain the casting piece steel for manufacturing the swing bolster side frame. The casting piece steel disclosed by the invention has the effects of purifying steel, improving a cast structure, reducing component segregation, carrying out microalloying in steel and deteriorating impurities.

Description

technical field [0001] The invention relates to a steelmaking preparation method, in particular to casting steel for railway vehicle bolster side frames and a preparation method thereof. Background technique [0002] The steel bolster side frame is an important part of the bogie, the running part of the railway vehicle. It is a key force-bearing component, and the entire weight of the carriage and cargo is transmitted to the axle through them. The speed increase of heavy loads and the upgrading of vehicles have put forward higher requirements on the quality of cast steel bolsters and side frames. [0003] At present, the range of alloying elements in the existing smelting process is relatively large, which is likely to affect the metallographic structure of castings. At the same time, the heat treatment time is longer, resulting in greater energy consumption. Moreover, the mixed crystal phenomenon that occurs in steel castings affects the grain size of the bolster side fra...

AI Technical Summary

Problems solved by technology

[0003] At present, the range of alloying elements in the existing smelting process is relatively large, which is likely to affect the metallographic structure of castings

At the same time, the heat treatment time is longer, resulting in greater energy consumption

Moreover, the mixed crystal phenomenon that occurs in steel castings affects the grain size of the bolster side frame, thereby affecting the quality of the bolster side frame

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