CN101597679B - Process for quenching-isothermal heat treatment on 50CrVA steel spring for high-speed heavy loading locomotive - Google Patents
Process for quenching-isothermal heat treatment on 50CrVA steel spring for high-speed heavy loading locomotive Download PDFInfo
- Publication number
- CN101597679B CN101597679B CN2009103041784A CN200910304178A CN101597679B CN 101597679 B CN101597679 B CN 101597679B CN 2009103041784 A CN2009103041784 A CN 2009103041784A CN 200910304178 A CN200910304178 A CN 200910304178A CN 101597679 B CN101597679 B CN 101597679B
- Authority
- CN
- China
- Prior art keywords
- spring
- temperature
- seconds
- quenching
- oil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention discloses a process for quenching-isothermal heat treatment on a 50CrVA steel spring for a high-speed heavy loading locomotive. The process comprises the following steps: polishing a 50CrVA steel round bar with diameter less than or equal to 50mm, and inductively heating the steel round bar to a temperature of between 960 and 1,060 DEG C; then, wrapping the round bar into a spring; cooling the wrapped spring to a temperature of between 840 and 920 DEG C, placing the spring into a constant temperature oil-quenching tank below Ms point, namely at a temperature of between 120 and 250 DEG C, and maintaining for 10 to 80 seconds; and quickly placing the spring into liquid salt above the Ms point, namely at a temperature of between 280 and 360 DEG C, maintaining for 100 to 1,000 seconds, and placing the spring into water or oil for cooling; and tempering the spring at a temperature of between 250 and 430 DEG C for 60 to 120 minutes. The method has the advantages that quantity and quality of martensite and size of the bainite substructure thereof can be controlled, a uniform duplex structure and high toughness can be obtained under the condition of different sizes, and the like.
Description
Technical field
The present invention relates to a kind of process for quenching-isothermal heat treatment on 50 CrVA steel spring for high-speed heavy loading locomotive, belong to the metal heat treatmet technical field.
Background technology
High-speed heavy loading locomotive and conventional locomotive spring are mechanical component very important on the locomotive, play the various effects such as damping, energy storage, connection, support.Locomotive spring is to work under the repeated stresses such as periodic bending and torsion, through tension, press, reverse, the condition of the dynamic load such as impact, therefore sometimes also to bear high in short-term sudden applied load, require that spring steel must have higher fatigue strength, high tensile strength and yield tensile ratio, enough plasticity and toughness and good surface quality, easily rolled forming, hardening capacity etc. preferably under hot state.High-speed locomotive steering frame spring goods mainly adopt the spring steel such as 50CrVA (50CrV4 Germany grade of steel), 51CrMoV4 (German grade of steel) at present.Main technique generally adopts the heat processing technique of Frequency Induction Heating bar-roll-forming-adjustment spring size-delayed quenching-tempering.This technique is short heat-up time, and decarburization is few, and spring coiling machine rolls, and dimensional precision is high.But because the spring steel carbon content is all higher, the direct quenching process obtains whole martensite, is easy to occur quenching crack and tiny crack, and the toughness plasticity after the tempering is lower, causes spring fatigue life not high.For addressing these problems, the someone adopts the thermal treatment process of temperature isothermal quenching more than 300 ℃ at present, obtains to improve as the main heterogeneous structure that adds the partial martensite composition take lower bainite the toughness of spring.After means of isothermal quenching, under the identical condition of hardness, compare with the normal quenching Annealed Strip, have high toughness, little notch sensitivity, but yield strength and fatigue strength have reduction approximately.Larger to high-speed heavy loading locomotive spring material footpath size simultaneously, not therefore isothermal quenching hardening capacity be difficult to use in larger-size spring.
Summary of the invention
The object of the invention is to: provide a kind of and can under the different size condition, obtain uniform heterogeneous structure and the high process for quenching-isothermal heat treatment on 50 CrVA steel spring for high-speed heavy loading locomotive of obdurability, to overcome the deficiencies in the prior art.
The present invention is achieved in that a kind of process for quenching-isothermal heat treatment on 50 CrVA steel spring for high-speed heavy loading locomotive of the present invention is, after the 50CrVA steel pole material polishing with diameter≤50mm, induction heating to 960 ℃～1060 ℃, then this pole material is rolled into spring, after being cooled to the spring that rolls between 840 ℃～920 ℃, put into that to be lower than below the Ms point be the time that kept in the constant temperature oil-quenching tank of temperature between 120 ℃～250 ℃ temperature 10～80 seconds, again spring is put into rapidly that to be higher than Ms be the isothermal salt liquid (NaNO of temperature between 280 ℃～360 ℃ more than selecting
3+ KNO
3) in the medium isothermal after 100 seconds～1000 seconds time at water or oil cooling, last between 250 ℃～430 ℃ temperature carry out 60～120 minutes processing of tempering.
Rolled spring is cooled to put into after 840 ℃～920 ℃ is lower than Ms and selects following temperature and rapidly it is changed after the constant temperature oil-quenching tank between 120 ℃～250 ℃ keeps 10～80 seconds time namely over to be higher than Ms be the isothermal salt liquid (NaNO of temperature between 280 ℃～360 ℃ more than selecting
3+ KNO
3) keep in the medium in water or oil, cooling off after time of 100 seconds～1000 seconds.
Owing to adopted technique scheme, the present invention adopts first being lower than martensite point Ms temperature and quenches, and keep for some time to obtain enough martensite volumes, and then be higher than a large amount of lower bainite of the above temperature isothermal acquisition of Ms point and the bainite of other transitional forms, by tempering, retained austenite is less than 3%.Realize the control of martensite and bainite structure form, quantity and substructure size thereof, reduced distortion and hardening crack tendency.Thereby eliminate obdurability and the elastic limit that quenching stress significantly improves the spring goods by average tempering again.The major advantage of this method of the present invention is to control martensite volume and character and bainite substructure size thereof, has to obtain uniform heterogeneous structure, obdurability advantages of higher under the large size condition.
The below is the 50CrVA steel spring correlation data that the 50CrVA steel spring made of the present invention and traditional technology are made:
50CrVA steel spring traditional technology: 840 Fei, the 410 ℃ of tempering of quenching
s
b(MPa)s
s(MPa)d
5(％)y(％) A
k(J)
1560 1310 8 25 22
Does 50CrVA steel spring quenching Shu of the present invention appoint deer ひ to blink? 320 ℃ of isothermals of-200 ℃ of 10 seconds Zhao of quenching of 840 Fei heating 300 seconds? 80 ℃ of tempering 90 minutes
s
b(MPa)s
s(MPa)d
5(％)y(％) A
k(J)
1760 1510 15 49 32
By above Data Comparison as can be known, the present invention compared with prior art, the goods of producing by the present invention have that fatigue resistance height, tensile strength and yield tensile ratio are high, the obdurability advantages of higher.
Embodiment
Embodiments of the invention: when the spring that the making high-speed heavy loading locomotive is used, first after the 50CrVA steel pole material polishing with diameter≤60mm, mode by induction heating is heated 960 ℃～1060 ℃, then this pole material is rolled into spring, after being cooled to the spring that rolls between 840 ℃～920 ℃, put into that to be lower than below the Ms point be the time that kept in the constant temperature oil-quenching tank of temperature between 120 ℃～250 ℃ temperature 10～80 seconds, again spring is put into rapidly that to be higher than Ms be the isothermal salt liquid (NaNO of temperature between 280 ℃～360 ℃ more than selecting
3+ KNO
3) in the medium isothermal after 100 seconds～1000 seconds time in water or oil but, at last it can be made after processing of 60～120 minutes of tempering carrying out under the temperature between 250 ℃～430 ℃.
Can realize that for guaranteeing quenching isothermal process of the present invention batch production needs to satisfy faster thermal conduction and good flowability, can when the low temperature interrupted hardening, have faster cooling power like this, when spring is quenched, rolled spring can be cooled to put into after 840 ℃～920 ℃ temperature keeps time of 10～80 seconds at the constant temperature oil-quenching tank between 120 ℃～250 ℃ after, it be put into rapidly to be higher than Ms be the isothermal salt liquid (NaNO of temperature between 280 ℃～360 ℃ more than selecting
3+ KNO
3) keep in the medium in water or oil, cooling off after time of 100 seconds～1000 seconds and get final product.
Claims (1)
1. process for quenching-isothermal heat treatment on 50 CrVA steel spring for high-speed heavy loading locomotive, it is characterized in that: after the 50CrVA steel pole material polishing with diameter≤50mm, induction heating to 960 ℃～1060 ℃, then this pole material is rolled into spring, after being cooled to the spring that rolls between 840 ℃～920 ℃, put into that to be lower than below the Ms point be the time that kept in the constant temperature oil-quenching tank of temperature between 120 ℃～250 ℃ temperature 10～80 seconds, again spring is put into rapidly that to be higher than Ms be that temperature keeps at isothermal salt liquid between 280 ℃～360 ℃ cooling off at water or oil after time of 100 seconds～1000 seconds more than selecting, last between 250 ℃～430 ℃ temperature carry out 60～120 minutes processing of tempering; Rolled spring is cooled to put into after 840 ℃～920 ℃ is lower than Ms and selects following temperature and rapidly it is changed after the constant temperature oil-quenching tank between 120 ℃～250 ℃ keeps 10～80 seconds time namely over to be higher than Ms be the isothermal salt liquid NaNO of temperature between 280 ℃～360 ℃ more than selecting
3+ KNO
3Maintenance was cooled off in water or oil after 100 seconds～1000 seconds time in the medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103041784A CN101597679B (en) | 2009-07-09 | 2009-07-09 | Process for quenching-isothermal heat treatment on 50CrVA steel spring for high-speed heavy loading locomotive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103041784A CN101597679B (en) | 2009-07-09 | 2009-07-09 | Process for quenching-isothermal heat treatment on 50CrVA steel spring for high-speed heavy loading locomotive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101597679A CN101597679A (en) | 2009-12-09 |
| CN101597679B true CN101597679B (en) | 2013-03-27 |
Family
ID=41419275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009103041784A Expired - Fee Related CN101597679B (en) | 2009-07-09 | 2009-07-09 | Process for quenching-isothermal heat treatment on 50CrVA steel spring for high-speed heavy loading locomotive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101597679B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734362B (en) * | 2012-06-27 | 2015-04-01 | 贵州大学 | Method for manufacturing high-strength and high-plasticity spring by using 60Si2CrVA spring steel |
| CN102965490A (en) * | 2012-11-26 | 2013-03-13 | 遵义市顺通机械有限公司 | Thermal treatment process of spring |
| CN105132652A (en) * | 2015-08-14 | 2015-12-09 | 中信重工机械股份有限公司 | Heat treatment method for improving comprehensive performances of ultrahigh-strength high alloy structural steel |
| CN105088081B (en) * | 2015-08-28 | 2018-03-13 | 浙江美力汽车弹簧有限公司 | The manufacturing process of stabiliser bar |
| CN105483555B (en) * | 2015-12-11 | 2017-12-05 | 贵州大学 | Spring steel and preparation method thereof and heat treatment method |
| CN111961811B (en) * | 2020-09-04 | 2022-05-24 | 燕山大学 | Method for preparing impact-resistant steel part by using phase change speed difference |
| CN112725590A (en) * | 2020-12-18 | 2021-04-30 | 苏州轴承厂股份有限公司 | Manufacturing method for low deformation of spring steel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101134995A (en) * | 2007-10-16 | 2008-03-05 | 长安汽车（集团）有限责任公司 | Alloy spring steel ultra-fine martensite heat treatment quenching strengthening process |
-
2009
- 2009-07-09 CN CN2009103041784A patent/CN101597679B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101134995A (en) * | 2007-10-16 | 2008-03-05 | 长安汽车（集团）有限责任公司 | Alloy spring steel ultra-fine martensite heat treatment quenching strengthening process |
Non-Patent Citations (8)
| Title |
|---|
| 65Mn钢波形弹簧的热处理工艺;张长英;《金属热处理》;20090228;第34卷(第2期);95-98 * |
| 一种弹簧热处理新工艺的分析探讨;陆大絃;《机械工程材料》;19960430;第20卷(第2期);41-43、45 * |
| 刘强等.淬火工艺对货车转向架螺旋弹簧组织的影响.《机车车辆工艺》.2008,(第3期),10-12. |
| 张长英.65Mn钢波形弹簧的热处理工艺.《金属热处理》.2009,第34卷(第2期),95-98. |
| 弹簧钢50CrVA复相组织强韧化机制的研究;李国刚;《天津理工大学学报》;20070831;第23卷(第4期);61-63 * |
| 李国刚.弹簧钢50CrVA复相组织强韧化机制的研究.《天津理工大学学报》.2007,第23卷(第4期),61-63. |
| 淬火工艺对货车转向架螺旋弹簧组织的影响;刘强等;《机车车辆工艺》;20080630(第3期);10-12 * |
| 陆大絃.一种弹簧热处理新工艺的分析探讨.《机械工程材料》.1996,第20卷(第2期),41-43、45. |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101597679A (en) | 2009-12-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101597680B (en) | Process for quenching-distribution heat treatment on 60Si2CrVA steel spring for trains | |
| CN101597679B (en) | Process for quenching-isothermal heat treatment on 50CrVA steel spring for high-speed heavy loading locomotive | |
| CN107109509B (en) | It is heat-treated steel, wear properties excellent superhigh intensity molded product and its manufacturing method | |
| CN100558504C (en) | The low temperature resistant oil derrick power transmission tower frame preparation method of seamless heterotype steel pipe | |
| CN102108469B (en) | Hot rolling hot straightening roll suitable for thick steel plates with thickness of less than or equal to 60mm and preparation method thereof | |
| CN100374584C (en) | Softening method of automobile component part cold extrusion blank | |
| CN101429619B (en) | High-strength steel tension rod and thermal treatment method thereof | |
| CN102605378A (en) | Carburizing and quenching method | |
| CN103966411B (en) | A kind of manufacture method of medium carbon cold heading steel Bar Wire Product | |
| CN102758140B (en) | High-carbon microalloying steel ball and production process thereof | |
| CN101348878A (en) | Isothermal quench bainitic ductile cast iron and use thereof | |
| CN105506249A (en) | Heat treatment method for high-nitrogen corrosion resistant plastic die steel | |
| CN102796965B (en) | Rolling mill support roll steel and heat treatment technology thereof | |
| CN101660036B (en) | Heat treating method of high strength and high ductility steel tube | |
| CN103882314A (en) | 42 CrMo steel cold-rolled sheet and its production method | |
| CN104946982A (en) | Wide thick plate hot-straightening machine working roll and manufacturing method thereof | |
| CN102719643A (en) | Heat processing technology of high-carbon carbon steel coil rod for steel wire rope | |
| CN101818236B (en) | Method for manufacturing high carbon steel wheel | |
| CN103498105A (en) | High-strength seamless steel tube for geological drilling and preparation method thereof | |
| CN103572013B (en) | A kind of Spheroidizing Annealing method of 40Cr steel | |
| CN101597681A (en) | A kind of process for heat-treatment on spring steel product for high-speed heavy-load trains | |
| CN109680127B (en) | Quenching and tempering process for large-size medium-carbon alloy structural round steel | |
| CN114622064B (en) | Spheroidizing annealing method of MnCr series low-carbon gear steel | |
| CN103667615A (en) | Thermal treatment method of 42CrMo workpiece | |
| CN102734362B (en) | Method for manufacturing high-strength and high-plasticity spring by using 60Si2CrVA spring steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130327 Termination date: 20190709 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |