CN102758130B - Axle steel used for railway car and production process thereof - Google Patents
Axle steel used for railway car and production process thereof Download PDFInfo
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- CN102758130B CN102758130B CN201210268565.9A CN201210268565A CN102758130B CN 102758130 B CN102758130 B CN 102758130B CN 201210268565 A CN201210268565 A CN 201210268565A CN 102758130 B CN102758130 B CN 102758130B
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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
The present invention relates to a kind of railway vehicle axle steel and manufacturing process thereof, belong to materials processing technology field.
Background technology
Axletree is the vitals of rail truck operation, supporting capacity and the transportation safety of its quality good or not direct relation train, and countries in the world railway interests all pays much attention to the raising of production technology and the quality in kind of axle steel.
The rail vehicle axletree of China is from start in the early days of foundation to continue to use USSR (Union of Soviet Socialist Republics) г o с т standard always.The axle steel carbon content approximately 0.40% of this standard regulation, because steel-making condition and heat-treat condition are at that time limited, the all technical of 40 axle steels is all lower, after axletree comes into operation, all only move under relatively low condition and about 5 years, just occur successively crackle in weight-carrying capacity and travelling speed at that time.Have document announcement, only in the July, 2002 from 1997 to, the whole nation occurs to cause axle fracture accident more than 70 to rise because fatigue strength is low altogether, causes huge loss to the country and people's property.
Along with developing rapidly of national economy, railway transport capacity, in the urgent need to being greatly improved, several times raises speed since the train of China in 1986, and maximum single-row weight has reached 20,000 tons.Original Vehicle Axles and quality and technical index can not meet the demand of China railways develop rapidly.For this reason, this patent discloses a kind of railway vehicle axle steel and manufacturing process thereof.
Summary of the invention
The object of the invention is open a kind of railway vehicle axle steel and manufacturing process thereof.The chemical composition of its steel billet and weight percent content should meet: C0.50-0.60%, Si0.20-0.50%, Mn0.7-0.9%, P≤0.018%, S≤0.008%, Alt >=0.020%, Cr≤0.25%, Ni≤0.25%, Cu≤0.25%, surplus is Fe and inevitable impurity.
Realize technical scheme of the present invention as described below, preprocessed molten iron is after converter smelting, again through LF stove refining treatment adjusting component, after the further deoxidation of molten steel, send the vacuum outgas of VD stove, vacuum tightness is greater than 0.03kPa, dark vacuum time is greater than 10min, and VD stove is processed front liquid steel temperature should be greater than 1600 ℃, after processing, should be greater than 1500 ℃.Then molten steel is molded into steel ingot, and heat is sent soaking pit heating, and soaking temperature is greater than 850 ℃, then carries out breaking down cogging and becomes non-scale square billet slow cooling, and it is 590650 ℃ that steel billet slow cooling enters to cheat temperature, goes out to cheat 260～290 ℃ of temperature, total slow cooling time 24h; Then forge, to forge axle blank heat-treat, comprise secondary normalizing and a tempering, one time normalizing Heating temperature is 860 ℃, heat-up time 3h; Secondary normalizing Heating temperature is 860 ℃, heat-up time 3h; 510～520 ℃ of tempering temperatures, heat-up time 4h.Its technological process of production summary is: molten iron-converter steelmaking-LF refining-VD Fruit storage-die casting-breaking down-slow cooling-forging-normalizing-tempering.
Outstanding advantages of the present invention is that in steel, gas content is extremely low, and mechanical property excellence organizes crystal grain tiny, and technique is workable, is applicable to manufacture the parts such as railway locomotive, lorry axletree.Can meet the property demand of China railways vehicle axle.
Embodiment
Below in conjunction with embodiment, the present invention is explained in detail.
Embodiment 1
The chemical composition of molten steel by weight percentage its content is: C0.55%, and Si0.23%, Mn0.72%, P0.017%, S0.005%, Cr0.04%, Ni0.01%, Cu0.01%, Alt0.045%, all the other are Fe and the trace impurity that cannot detect.The composition of converter molten steel after LF stove refining treatment, adjustment is: C0.53%, and Si0.23%, Mn0.70%, P0.015%, S0.005%, Cr0.04%, Ni0.01%, Cu0.01%, Alt0.049%, all the other are Fe and the trace impurity that cannot detect.After finishing, refining feeds aluminum steel 400mm with further deoxidation.After refining, molten steel send the vacuum outgas of VD stove, vacuum tightness 0.041kPa, and dark vacuum time 13min, it is 1625 ℃ that VD stove is processed front liquid steel temperature, after processing, is 1557 ℃.Molten steel is molded into steel ingot, and heat is carried out breaking down cogging slow cooling after sending soaking pit heating, and 867 ℃ of Soaking Pit Temperature, just roll into non-scale square billet, and steel billet enters 620 ℃ of burial pit temperature, goes out 270 ℃ of burial pit temperature, total slow cooling time 24h.Square billet after slow cooling is forged into axle blank according to requirements, then heat-treats, comprise a normalizing (860 ℃, 3h), secondary normalizing (860 ℃, 3h) processing, tempering (510 ℃, 4h).Extremely low by gas content in the axle blank after above-mentioned art breading, mechanical property excellence, organizes crystal grain tiny, and detected value refers to table 1 and table 2.
Table 1 mechanical property detected value
Table 2 gas content detected value (%)
Claims (1)
1. a manufacturing process for railway vehicle axle steel, its technological process of production summary is: the vacuum outgas-die casting-breaking down-slow cooling-forging-normalizing-tempering of molten iron-converter steelmaking-LF refining-VD stove; It is characterized in that steel billet chemical composition and weight percent content should meet: C0.50-0.60%, Si0.20-0.50%, Mn0.7-0.9%, P≤0.018%, S≤0.008%, Alt >=0.020%, Cr≤0.25%, Ni≤0.25%, Cu≤0.25%, surplus is Fe and inevitable impurity; Preprocessed molten iron after converter smelting again through LF stove refining treatment adjusting component, after the further deoxidation of molten steel, send the vacuum outgas of VD stove, vacuum tightness is greater than 0.03kPa, and dark vacuum time is greater than 10min, VD stove liquid steel temperature before treatment should be greater than 1600 ℃, after processing, should be greater than 1500 ℃; Molten steel after vacuum-treat is molded into steel ingot, heat is carried out breaking down cogging after sending soaking pit to heat and is rolled into non-scale square billet slow cooling, and soaking temperature is greater than 850 ℃, and the temperature that enters to cheat of steel billet slow cooling is 590～650 ℃, going out to cheat temperature is 260～290 ℃, total slow cooling time 24h; Then forge, to forge axle blank heat-treat, comprise secondary normalizing and a tempering, one time normalizing Heating temperature is 860 ℃, heat-up time 3h; Secondary normalizing Heating temperature is 860 ℃, heat-up time 3h; Tempering temperature 510-520 ℃, heat-up time 4h.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210268565.9A CN102758130B (en) | 2012-07-31 | 2012-07-31 | Axle steel used for railway car and production process thereof |
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| CN201210268565.9A CN102758130B (en) | 2012-07-31 | 2012-07-31 | Axle steel used for railway car and production process thereof |
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| CN102758130A CN102758130A (en) | 2012-10-31 |
| CN102758130B true CN102758130B (en) | 2014-06-18 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2938938C (en) * | 2014-02-26 | 2020-02-25 | Nippon Steel & Sumitomo Metal Corporation | Rail vehicle axle |
| CN104032212B (en) * | 2014-06-13 | 2017-02-15 | 攀钢集团攀枝花钢铁研究院有限公司 | Steel for railway vehicle and preparation method of steel |
| CN105886740A (en) * | 2016-06-04 | 2016-08-24 | 马鞍山钢铁股份有限公司 | Heat treatment method for carrying out isothermal annealing on railway vehicle axle in advance |
| CN107475607B (en) * | 2017-07-10 | 2019-06-14 | 西王金属科技有限公司 | One kind being used for low-alloy sub-eutectoid steel heat treatment method after forging |
| CN112916788B (en) * | 2021-01-19 | 2023-01-31 | 建龙北满特殊钢有限责任公司 | Production method for forging axle for railway vehicle by adopting continuous casting billet |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101497968A (en) * | 2009-03-16 | 2009-08-05 | 江苏沙钢集团淮钢特钢有限公司 | Steel for microalloying lorry axle and technique for producing the same |
| CN101724787A (en) * | 2008-10-21 | 2010-06-09 | 攀钢集团研究院有限公司 | Axle shaft steel and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101724787A (en) * | 2008-10-21 | 2010-06-09 | 攀钢集团研究院有限公司 | Axle shaft steel and preparation method thereof |
| CN101497968A (en) * | 2009-03-16 | 2009-08-05 | 江苏沙钢集团淮钢特钢有限公司 | Steel for microalloying lorry axle and technique for producing the same |
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