Method for manufacturing carburization bearing steel for high speed train
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A technology of high-speed EMUs and manufacturing methods, which is applied in the field of metal material manufacturing, and can solve problems such as unsatisfactory requirements
Active Publication Date: 2017-12-22
FUSHUN SPECIAL STEEL SHARES +2
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[0004] The publication number is CN 102226253 A, and the publication date is October 26, 2011. The patent titled "A Carburized Bearing Steel for High-speed Railway and Its Preparation Method" discloses a carburized bearing steel, which is characterized in that the chemical elements Percentage by weight: carbon: 0.18% to 0.24%, silicon not more than 0.10%, manganese not more than 0.10%, phosphorus not more than 0.01%, sulfur not more than 0.005%, chromium: 0.5% to 2.0%, nickel: 1.5% to 4.5% %, molybdenum: 0.3%~1.5%, niobium: 0.02%~0.04%, vanadium 0.3%~0.9%, the remainder is Fe and unavoidable impurities, [O]+[N+[H] content is 0.0020%~ 0.0040% and As+Sn+Ti+Sb+Pb not more than 0.060%, the beari
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Embodiment 1
[0039] Both Example 1 and Example 2 adopt the production process: vacuum induction furnace smelting→casting electrodes→electrode annealing→vacuum consumable furnace remelting→steel ingot annealing→steel ingot forging→bar annealing.
[0040] 1. Production process
[0041] (1) Vacuum induction furnace smelting: Industrial pure iron and pure metal materials that meet the requirements are used. The element content of industrial pure iron is 0.18% carbon, 0.20% silicon, 0.001% sulfur, 0.003% phosphorus, and 0.002% titanium. Calcium is 0.0002%; pure metal materials such as silicon, manganese, chromium, nickel and molybdenum are oil-free and rust-free on the surface.
[0042] ① Melting period: Industrial pure silicon, metal chromium, metal nickel, metal molybdenum and industrial pure iron are added in batches during the melting period and electro-melted, leaving a small part of pure metal residue and all metal manganese for subsequent seasoning.
[0043] (3) After the electrode is d...
Embodiment 2
[0063] 1. Production process
[0064] ⑴ Vacuum induction furnace smelting: ② Refining period: the vacuum degree of the smelting chamber is pumped to 3Pa, and the refining temperature of the molten steel is kept at 1560°C. After the holding time is 120min, the other elements except manganese are seasoned and the control target requirements are met; throughout the refining During the process, add carbon powder 2 times and stir several times.
[0065] (2) Pouring period: According to the requirements of the control target, after adding metal manganese and adjusting the temperature of the molten steel to 1578°C, the electrode is poured, and the electrode specification is Φ580mm.
[0066] ⑹ Forging process: The steel ingot is heated in the heating furnace at 100°C / h to 600°C for 2 hours, and then the temperature is raised at 100°C / h. When the temperature reaches 850°C, the heat preservation is started. h rises to 1200°C for 3 hours; start forging, the first fire forges the steel i...
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Abstract
The invention discloses a method for manufacturing carburization bearing steel for a high speed train and aims to reduce contents of aluminum and titanium in steel to the minimum, reduce content of gas in steel and produce the ultrapure and ultra-fine grain carburization bearing steel with ultralow gas content through selecting specially-made high-purity ingot iron and pure metal charge and adopting vacuum induction + vacuum self-consuming smelting process. The method has the following advantages: the ultrapure carburization bearing steel with ultralow gas content is obtained, wherein content of hydrogen is not greater than 0.0001%, content of oxygen is not greater than 0.0006%, content of nitrogen is not greater than 0.0009%, content of fine series inclusions of A category, B category, C category and D category of nonmetallic inclusions is not greater than grade 1.0, content of Ds category is grade 0.5, and other types of inclusions are not contained; the grain size grade is grade 7.0 or above after the cementation process is adopted for treatment.
Description
technical field [0001] The invention belongs to the field of metal material manufacturing, and relates to a method for manufacturing carburized bearing steel for high-speed train sets, which is mainly applied to the production of bearing ring materials for axle boxes of train sets. Background technique [0002] At present, my country's high-speed railway is developing rapidly. It has built 20,000 kilometers of high-speed railway with world advanced level, and developed and produced Chinese standard EMUs with completely independent intellectual property rights. However, the high-carbon chromium bearing market for EMU axle boxes is monopolized by imported products. At present, the axle box bearings for EMUs produced by domestic OEMs are all imported from Europe and Japan. The main suppliers are SKF in Sweden, FAG in Germany, NTN in Japan and NSK in Japan. , foreign companies have imposed a strict technical blockade on China, and it is imminent to carry out independent research...
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