Axle steel used for railway car and production process thereof
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A manufacturing process and technology for railway vehicles, applied in the field of material processing, can solve problems such as insufficiency, and achieve the effects of fine grain structure, low gas content and excellent mechanical properties
Active Publication Date: 2014-06-18
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology
The original vehicle axles and quality technical indicators can no longer meet the needs of the rapid development of my country's railways
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Embodiment 1
[0010] The chemical composition of molten steel is calculated by weight percentage: C0.55%, Si0.23%, Mn0.72%, P0.017%, S0.005%, Cr0.04%, Ni0.01%, Cu0.01 %, Alt0.045%, and the rest are Fe and undetectable trace impurities. Converter molten steel is refined by LF furnace and the adjusted composition is: C0.53%, Si0.23%, Mn0.70%, P0.015%, S0.005%, Cr0.04%, Ni0.01%, Cu0 .01%, Alt 0.049%, the rest is Fe and undetectable trace impurities. After refining, feed aluminum wire 400mm for further deoxidation. After refining, the molten steel is sent to VD furnace for vacuum degassing, the vacuum degree is 0.041kPa, and the deep vacuum time is 13min. Molten steel is mold-cast into steel ingots, heated in a soaking furnace for preliminary rolling and slow cooling. The temperature of the soaking furnace is 867°C, and the billet is initially rolled into a non-cut billet. The billet enters the slow cooling pit at a temperature of 620°C and exits for slow cooling The pit temperature is 270°C...
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Abstract
The invention discloses an axle steel used for a railway car and a production process thereof, belonging to the technical field of material processing. The chemical compositions and the contents (weight percentage) of a steel blank conform to 0.50-0.60% of C, 0.20-0.50% of Si, 0.7-0.9% of Mn, not more than 0.018% of P, not more than 0.008% of S, not less than 0.020% of Alt, not more than 0.25% of Cr, not more than 0.25% of Ni, not more than 0.25% of Cu, and the balance of Fe and inevitable impurities. The production process comprises the following steps: after molten steel of a converter is refined and treated by an LF (Low frequency) furnace, transmitting to a VD (Vacuum distillation) furnace to degas in vacuum under the conditions that the vacuum degree is greater than 0.03 kPa, the deep vacuum time is greater than 10 minutes, the temperature of the molten steel before treatment is greater than 1600 DEG C, and the temperature of the molten steel after treatment is greater than 1500 DEG C; casting a mould to a steel ingot, after thermally feeding and heating the steel ingot by a soaking pit furnace, blooming and cogging to a square blank without a fixed size and slowly cooling, wherein the soaking temperature is more than 850 DEG C, the temperature of slowly cooling into a pit is 590-650 DEG C, the pit outlet temperature is 260-290 DEG C and the total slow cooling time is 24 hours; after the axle steel is forged, carrying out normalization (860 DEG C, 3 hours) twice and tempering (510-520 DEG C, 4 hours) once. The invention has the advantages of extreme low gas content in the steel and excellent mechanical property, and is suitable for producing components, such as axles of locomotives, truck and the like.
Description
technical field [0001] The invention relates to an axle steel for railway vehicles and a manufacturing process thereof, belonging to the technical field of material processing. Background technique [0002] Axle is an important part of the operation of railway vehicles, and its quality is directly related to the carrying capacity and transportation safety of the train. The railway departments of all countries in the world attach great importance to the production technology of axle steel and the improvement of physical quality. [0003] my country's railway vehicle axles have been using the former Soviet Union's гост standard since the early days of the founding of the People's Republic of China. The carbon content of axle steel stipulated in this standard is about 0.40%. Due to the limited steelmaking conditions and heat treatment conditions at that time, the technical indicators of 40 axle steel were relatively low. After the axle was put into use, the load capacity and ru...
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