CN101649389A - Heat processing method for improving axle yield strength by using continuous furnaces - Google Patents
Heat processing method for improving axle yield strength by using continuous furnaces Download PDFInfo
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- CN101649389A CN101649389A CN200910170104A CN200910170104A CN101649389A CN 101649389 A CN101649389 A CN 101649389A CN 200910170104 A CN200910170104 A CN 200910170104A CN 200910170104 A CN200910170104 A CN 200910170104A CN 101649389 A CN101649389 A CN 101649389A
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- axletree
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Abstract
The invention relates to a heat processing method for improving axle yield strength by using continuous furnaces, belonging to the technical field of heat processing of axles of trains. The inventionprovides a heat processing method for improving axle yield strength by using continuous furnaces, which improves the comprehensive mechanical property of the heat processed axle and meets other technical indexes. The heat processing method comprises the steps of primary normalizing, secondary normalizing and tempering, wherein a normalizing furnace and a tempering furnace which are used in the heat processing are suspended continuous furnaces. The invention is applied to the heat processing of axles of trains.
Description
Technical field
The present invention uses the heat treating method of continuous oven raising axle yield strength, belongs to the heat treatment technics field of railway locomotive axle.
Background technology
Domestic different kinds of railways motorcycle axle adopts highquality carbon steel among the standard TB/T2945-1999 with the LZW50 steel, all adopts behind the double normalizing tempered thermal treatment process again, and the over-all properties of material has obtained giving full play to.Existing standard TB/T2945-1999 regulation, mechanical property test and microscopic test are done in sampling after the axletree thermal treatment, and have stipulated the standard-required that must reach.The axletree that adopts common heat treating method to obtain, though the requirement that its yield strength can be up to state standards, but generally do not reach requirement to the demanding use occasion of axle yield strength, for example export and use axletree, and the disposable qualification rate of existing heat treating method is lower, need heat-treat and do over again, cause the increase of production cost.Simultaneously, have now when adopting pit furnace thermal treatment, all need be cooled to lesser temps after normalizing and the tempering and just be for further processing, need three shove charges and the cooling of coming out of the stove for three times, thermal treatment non-cutting time is long, labour intensity is big, and speed of cooling is adjusted in difficult variation according to envrionment conditions.
Summary of the invention
The present invention overcomes the deficiencies in the prior art, and a kind of heat treating method that uses continuous oven to improve axle yield strength is provided, and the axletree after the thermal treatment has improved yield strength, and the comprehensive mechanical performance of axletree is improved.
For addressing the above problem, the technical solution used in the present invention is: use continuous oven to improve the heat treating method of axle yield strength, comprising: normalizing for the first time, normalizing for the second time and tempering, operation according to the following steps:
A, will forge good axletree and put into normalizing furnace and carry out normalizing treatment first time, the normalizing holding temperature is 880 ℃ ± 10 ℃, is incubated axletree directly to be sent into a cold air chamber after finishing and cool off, and cooled axletree temperature reaches below 500 ℃;
B, will be cooled to temperature and reach axletree below 500 ℃ and send into normalizing furnace and carry out the normalizing treatment second time, the normalizing holding temperature is 810 ℃ ± 10 ℃, after insulation finishes axletree is directly sent into No. two cold air chamber and cool off, cooled axletree temperature reaches below 250 ℃;
C, will be cooled to temperature and reach axletree below 250 ℃ and send into tempering stove and carry out temper, the tempering holding temperature is 510 ℃ ± 15 ℃, after insulation finishes axletree is directly sent to go into cold air chamber No. three and cool off cool to room temperature;
Described normalizing furnace and tempering stove all adopt the suspension type continuous oven.
The beneficial effect that the heat treating method that the present invention uses continuous oven to improve axle yield strength compared with prior art has is: adopt air cooled method different with prior heat treatment, axletree directly enters cold air chamber after through normalizing furnace, secondary normalizing stove and a tempering stove, has realized once hanging three processing; Shortened heat treated cycle duration, reduced labour intensity, the yield strength of thermal treatment back axle is significantly improved, and compares with the yield strength of the axletree that adopts existing thermal treatment process to obtain on average to have improved 9%, and the comprehensive mechanical performance of axletree also is improved.
Embodiment
Content of the present invention is further described LZW50 steel axletree embodiment in conjunction with following embodiment: the starting material of LZW50 steel axletree adopt the LZ50 highquality carbon steel of Chinese Industrial Standards (CIS) TB/T2945-1999; Following table 1 is LZ50 highquality carbon steel axletree steel billet chemical ingredients (%) table of TB/T2945-1999 standard.
| The standard and the trade mark | ??C | ??Mn | ??Si | ??P | ??S | ??Cr | ??Ni | ??Cu | ??T·Al | ??Mo | ??V | ??H ??≤ ??PPm |
| Chinese T B/T2945 LZ50 | ??0.47 ??～ ??0.57 | ??0.6 ??～ ??0.9 | ??0.17 ??～ ??0.4 | ??≤ ??0.03 | ??≤ ??0.03 | ??≤ ??0.3 | ??≤ ??0.3 | ??≤ ??0.25 | ??≥ ??0.02 | ??2.5 |
Table 1
By weight, the carbon content in the used starting material of the present invention is controlled at 0.50%～0.54%, and manganese content is controlled at 0.73%～0.82%, and all the other chemical composition contents keep the scope in the primary standard.
Above-mentioned starting material are heat-treated according to following steps after making axletree through forging:
A, will forge good axletree and put into normalizing furnace and carry out the normalizing treatment first time, the normalizing holding temperature is 880 ℃ ± 10 ℃, soaking time is according to the diameter of axletree wheel seat and different, be generally 3.5h～4h, wheel seat diameter 〉=220mm's, soaking time is 4h～4.5h, wheel seat diameter 〉=250mm's, soaking time is 4.5h～5h, after insulation finishes axletree is directly sent into a cold air chamber and cools off, and cooled axletree temperature reaches below 500 ℃;
B, will be cooled to temperature and reach axletree below 500 ℃ and send into normalizing furnace and carry out the normalizing treatment second time, the normalizing holding temperature is 810 ℃ ± 10 ℃, soaking time is according to the diameter of axletree wheel seat and different, be generally 3.5h～4h, wheel seat diameter 〉=220mm's, soaking time is 4h～4.5h, wheel seat diameter 〉=250mm's, soaking time is 4.5h～5h, after insulation finishes axletree is directly sent into No. two cold air chamber and cools off, and cooled axletree temperature reaches below 250 ℃;
C, will be cooled to temperature and reach axletree below 250 ℃ and send into tempering stove and carry out temper, the tempering holding temperature is 510 ℃ ± 15 ℃, soaking time is according to the diameter of axletree wheel seat and different, be generally 3.5h～4h, wheel seat diameter 〉=220mm's, soaking time is 4h～4.5h, wheel seat diameter 〉=250mm's, soaking time is 4.5h～5h, after insulation finishes axletree is directly sent into No. three cold air chamber and cools off cool to room temperature;
Described normalizing furnace and tempering stove all adopt the suspension type continuous oven, and above-mentioned cold air chamber is a prior art.
Claims (2)
1, use continuous oven to improve the heat treating method of axle yield strength, comprising: normalizing for the first time, normalizing for the second time and tempering is characterized in that operating according to the following steps:
A, will forge good axletree and put into normalizing furnace and carry out normalizing treatment first time, the normalizing holding temperature is 880 ℃ ± 10 ℃, is incubated axletree directly to be sent into a cold air chamber after finishing and cool off, and cooled axletree temperature reaches below 500 ℃;
B, will be cooled to temperature and reach axletree below 500 ℃ and send into normalizing furnace and carry out the normalizing treatment second time, the normalizing holding temperature is 810 ℃ ± 10 ℃, after insulation finishes axletree is directly sent into No. two cold air chamber and cool off, cooled axletree temperature reaches below 250 ℃;
C, will be cooled to temperature and reach axletree below 250 ℃ and send into tempering stove and carry out temper, the tempering holding temperature is 510 ℃ ± 15 ℃, after insulation finishes axletree is directly sent into No. three cold air chamber and cools off cool to room temperature.
2, use continuous oven according to claim 1 improves the heat treating method of axle yield strength, and it is characterized in that: described normalizing furnace and tempering stove all adopt the suspension type continuous oven.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910170104A CN101649389A (en) | 2009-09-03 | 2009-09-03 | Heat processing method for improving axle yield strength by using continuous furnaces |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910170104A CN101649389A (en) | 2009-09-03 | 2009-09-03 | Heat processing method for improving axle yield strength by using continuous furnaces |
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| CN101649389A true CN101649389A (en) | 2010-02-17 |
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| CN200910170104A Pending CN101649389A (en) | 2009-09-03 | 2009-09-03 | Heat processing method for improving axle yield strength by using continuous furnaces |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268528A (en) * | 2011-08-02 | 2011-12-07 | 长春轨道客车装备有限责任公司 | Heat treatment method for IRS (India Railway Standard) axle |
| CN102268527A (en) * | 2011-08-02 | 2011-12-07 | 长春轨道客车装备有限责任公司 | Thermal treatment method of AAR (Association of American railroads) F grade axle |
| CN102952934A (en) * | 2011-08-30 | 2013-03-06 | 人本集团有限公司 | Heat treatment process for improving strength of inner flange of third-generation wheel hub bearing of vehicle |
| CN107099749A (en) * | 2017-05-02 | 2017-08-29 | 内蒙古包钢钢联股份有限公司 | Containing tough roll stell of rare earth high-strength and preparation method thereof and Technology for Heating Processing |
| CN114507822A (en) * | 2022-04-07 | 2022-05-17 | 晋西车轴股份有限公司 | High-strength, high-toughness and high-plasticity axle carbon steel and heat treatment process of forging thereof |
-
2009
- 2009-09-03 CN CN200910170104A patent/CN101649389A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268528A (en) * | 2011-08-02 | 2011-12-07 | 长春轨道客车装备有限责任公司 | Heat treatment method for IRS (India Railway Standard) axle |
| CN102268527A (en) * | 2011-08-02 | 2011-12-07 | 长春轨道客车装备有限责任公司 | Thermal treatment method of AAR (Association of American railroads) F grade axle |
| CN102952934A (en) * | 2011-08-30 | 2013-03-06 | 人本集团有限公司 | Heat treatment process for improving strength of inner flange of third-generation wheel hub bearing of vehicle |
| CN107099749A (en) * | 2017-05-02 | 2017-08-29 | 内蒙古包钢钢联股份有限公司 | Containing tough roll stell of rare earth high-strength and preparation method thereof and Technology for Heating Processing |
| CN107099749B (en) * | 2017-05-02 | 2019-06-04 | 内蒙古包钢钢联股份有限公司 | Containing tough roll stell of rare earth high-strength and preparation method thereof and heat treatment process |
| CN114507822A (en) * | 2022-04-07 | 2022-05-17 | 晋西车轴股份有限公司 | High-strength, high-toughness and high-plasticity axle carbon steel and heat treatment process of forging thereof |
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Open date: 20100217 |