CN101597681A - A kind of process for heat-treatment on spring steel product for high-speed heavy-load trains - Google Patents
A kind of process for heat-treatment on spring steel product for high-speed heavy-load trains Download PDFInfo
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- CN101597681A CN101597681A CNA2009103041801A CN200910304180A CN101597681A CN 101597681 A CN101597681 A CN 101597681A CN A2009103041801 A CNA2009103041801 A CN A2009103041801A CN 200910304180 A CN200910304180 A CN 200910304180A CN 101597681 A CN101597681 A CN 101597681A
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- 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
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- Heat Treatment Of Strip Materials And Filament Materials (AREA)
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Abstract
The invention discloses a kind of process for heat-treatment on spring steel product for high-speed heavy-load trains, when spring steel is heated to 960 ℃～1100 ℃ temperature, it is rolled into spring, then the spring that rolls into is cooled to A
R1Below 5 ℃～50 ℃ temperature, and after being incubated 0～1 hour, again the spring that rolls into is reheated A
C3More than 5 ℃～50 ℃ temperature, and then quench, temper, thereby make high-speed heavy-load trains spring steel goods.Compared with prior art, the present invention not only has fatigue resistance height, tensile strength and yield tensile ratio height, has enough plasticity and flexible advantage, rolls shaping, advantage such as hardening capacity preferably easily but also have under hot state.
Description
Technical field
The present invention relates to a kind of process for heat-treatment on spring steel product for high-speed heavy-load trains, belong to the metal heat treatmet technical field.
Background technology
Locomotive and train spring are crucial mechanical component, play various effects such as damping, energy storage, connection, support.Locomotive spring is to work under repeated stress such as periodic crooked and reverse, through tension, press, reverse, the condition of dynamic load such as impact, therefore sometimes also to bear high sudden applied load in short-term, require spring steel must have higher fatigue strength, high tensile strength and yield tensile ratio, enough plasticity and toughness and favorable surface quality, under hot state, roll shaping easily, hardening capacity etc. preferably.At present, the locomotive spring steel work mainly adopts spring steel such as 60Si2CrVA, 50CrVA.Main thermal treatment process generally adopts Frequency Induction Heating bar-roll-forming-adjustment spring size-delayed quenching-tempered heat processing technique.This technology is short heat-up time, and decarburization is few, and spring coiling machine rolls, the dimensional precision height.But because the spring steel carbon content is all higher, the direct quenching process obtains whole martensite, and crystal grain is thicker, be easy to occur quenching 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 the above temperature isothermal of 300 Fei-quenching at present, and obtaining with the bainite is the toughness that the main heterogeneous structure that adds the partial martensite composition improves 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.To the larger-size spring in material footpath, isothermal quenching hardening capacity is not enough simultaneously, therefore is difficult to use in larger-size spring.
Summary of the invention
The objective of the invention is to: provide a kind of process for heat-treatment on spring steel product for high-speed heavy-load trains that can prevent hardening break and spring steel goods early fatigue fracture and have good obdurability, to overcome the deficiencies in the prior art.
The present invention is achieved in that a kind of process for heat-treatment on spring steel product for high-speed heavy-load trains of the present invention is, when spring steel is heated to 960 ℃～1100 ℃ temperature, it is rolled into spring, then the spring that rolls into is cooled to A
R1Below 5 ℃～50 ℃ temperature, and after being incubated 0～1 hour, again the spring that rolls into is reheated A
C3More than 5 ℃～50 ℃ temperature, and then quench, temper, thereby make high-speed heavy-load trains spring steel goods.
Above-mentioned spring steel is 60Si2CrVA, when the 60Si2CrVA spring steel is heated to 960 ℃～1100 ℃ temperature, it is rolled into spring, then the spring that rolls into is cooled to A
R1Following temperature is about to its cooling between 600 ℃～690 ℃, is incubated 0～1 hour, and then the spring that rolls into is reheated A
C3Above temperature is about to it and is heated between 850 ℃～900 ℃, carries out 480 ℃ of temper of oil quenching then, thereby makes high-speed heavy-load trains spring steel goods.
Aforementioned spring steel is 50CrVA, when the 50CrVA spring steel is heated to 960 ℃～1100 ℃ temperature, it is rolled into spring, then the spring that rolls into is cooled to A
R1Following temperature is about to its cooling between 590 ℃～650 ℃, is incubated 0～1 hour, and then the spring that rolls into is reheated A
C3Above temperature is about to it and is heated between 820 ℃～880 ℃, carries out 480 ℃ of temper of oil quenching then, thereby makes high-speed heavy-load trains spring steel goods.
Above-mentioned heating means are induction heating.
Owing to be pre-chilled to earlier after having adopted technique scheme, the present invention to adopt high temperature to roll and be less than about A
R1Temperature, and keep certain hour, make heart portion also be as cold as this temperature range generation pearlitic transformation, and then be heated a little higher than A
C3Temperature, make it produce recrystallization and effective refine austenite crystal grain, and then Q-tempering obtains good combination of strength and toughness.Thereby problems such as high-speed train bogie spring hardening break, early fatigue fracture have been solved effectively.
The product performance correlation data that records the present invention and conventional springs steel heat treatment process through experiment is as follows:
The 60Si2CrVA traditional technology:
After rolling, high temperature is pre-chilled to quench 5～6 grades of 90 minutes grain fineness numbers of 480 Fei tempering of 850 Fei
s
b(MPa)s
s(MPa)d
5(％)y(％) A
ku(J)
1720 1470 6 13 10
60Si2CrVA precooling-quenching technology of the present invention:
After rolling, high temperature is pre-chilled to 650 Fei reheat to 8 grades of 90 minutes grain fineness numbers of 850 Fei oil quenchings, 480 Fei tempering
s
b(MPa)s
s(MPa)d
5(％)y(％) A
ku(J)
1740 1490 12 23 22
The 50CrVA traditional technology:
After rolling, high temperature is pre-chilled to quench 5～6 grades of 90 minutes grain fineness numbers of 420 Fei tempering of 840 Fei
s
b(MPa)s
s(MPa)d
5(％)y(％) A
ku(J)
1520 1270 8 22 12
60Si2CrVA precooling-quenching technology of the present invention:
After rolling, high temperature is pre-chilled to 650 Fei reheat to 8 grades of 90 minutes grain fineness numbers of 850 Fei oil quenchings, 480 Fei tempering
s
b(MPa)s
s(MPa)d
5(％)y(％) A
ku(J)
1540 1310 10 33 24
By above data contrast as can be known, the present invention compared with prior art, the present invention not only has the advantage that can prevent hardening break and prevent spring steel goods early fatigue fracture, but also have fatigue resistance height, tensile strength and yield tensile ratio height, have enough plasticity and flexible advantage, and also have and under hot state, roll shaping, advantage such as hardening capacity preferably easily.
Embodiment
Embodiments of the invention 1: after will being rolled into the 60Si2CrVA spring steel polishing of pole material, during by induction heating to 960 ℃～1100 ℃ of temperature, it is rolled into spring, then the spring that rolls into is cooled to A
R1Following temperature is about to its cooling between 600 ℃～690 ℃, is incubated 0～1 hour, and then the spring that rolls into is reheated A
C3Above temperature is about to it and is heated between 850 ℃～900 ℃, carries out 480 ℃ of temper of oil quenching then, can make high-speed heavy-load trains spring steel goods.
Embodiments of the invention 2: after will being rolled into the 50CrVA spring steel steel polishing of pole material, during by induction heating to 960 ℃～1100 ℃ of temperature, it is rolled into spring, then the spring that rolls into is cooled to A
R1Following temperature is about to its cooling between 590 ℃～650 ℃, is incubated 0～1 hour, and then the spring that rolls into is reheated A
C3Above temperature is about to it and is heated between 820 ℃～880 ℃, carries out 480 ℃ of temper of oil quenching then, can make high-speed heavy-load trains spring steel goods.
Claims (4)
1. process for heat-treatment on spring steel product for high-speed heavy-load trains, it is characterized in that: when spring steel is heated to 960 ℃～1100 ℃ temperature, it is rolled into spring, then the spring that rolls into is cooled to below the Ar1 5 ℃～50 ℃ temperature, and after being incubated 0～1 hour, again the spring that rolls into is reheated more than the Ac3 5 ℃～50 ℃ temperature, and then quench, temper, thereby make high-speed heavy-load trains spring steel goods.
2. process for heat-treatment on spring steel product for high-speed heavy-load trains according to claim 1, it is characterized in that: described spring steel is 60Si2CrVA, when the 60Si2CrVA spring steel is heated to 960 ℃～1100 ℃ temperature, it is rolled into spring, then the spring that rolls into is cooled to the following temperature of Ar1, be about to its cooling between 600 ℃～690 ℃, be incubated 0～1 hour, and then the spring that rolls into reheated the above temperature of Ac3, being about to it is heated between 850 ℃～900 ℃, carry out 480 ℃ of temper of oil quenching then, thereby make high-speed heavy-load trains spring steel goods.
3. process for heat-treatment on spring steel product for high-speed heavy-load trains according to claim 1, it is characterized in that: described spring steel is 50CrVA, when the 50CrVA spring steel is heated to 960 ℃～1100 ℃ temperature, it is rolled into spring, then the spring that rolls into is cooled to the following temperature of Ar1, be about to its cooling between 590 ℃～650 ℃, be incubated 0～1 hour, and then the spring that rolls into reheated the above temperature of Ac3, being about to it is heated between 820 ℃～880 ℃, carry out 480 ℃ of temper of oil quenching then, thereby make high-speed heavy-load trains spring steel goods.
4. according to claim 1,2 or 3 described process for heat-treatment on spring steel product for high-speed heavy-load trains, it is characterized in that: the described induction heating that is heated to be.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2009103041801A CN101597681A (en) | 2009-07-09 | 2009-07-09 | A kind of process for heat-treatment on spring steel product for high-speed heavy-load trains |
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| CNA2009103041801A CN101597681A (en) | 2009-07-09 | 2009-07-09 | A kind of process for heat-treatment on spring steel product for high-speed heavy-load trains |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101818240A (en) * | 2010-03-22 | 2010-09-01 | 马鞍山钢铁股份有限公司 | Thermal processing method for medium carbon silicon manganese low alloy steel railway wheel |
| CN102626844A (en) * | 2012-03-16 | 2012-08-08 | 杭州兴发弹簧有限公司 | Producing technology of rail shock-insulating spring |
| CN110468263A (en) * | 2019-09-12 | 2019-11-19 | 北京理工大学 | A kind for the treatment of process obtaining the advanced high-strength steel of high-strength and high ductility |
| CN112251679A (en) * | 2020-09-18 | 2021-01-22 | 东南大学 | Double-phase high-strength steel and preparation method thereof |
Citations (4)
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| CN1067684A (en) * | 1991-06-15 | 1993-01-06 | 徐厚国 | Hot treating method for elastic parts |
| CN1108699A (en) * | 1994-12-28 | 1995-09-20 | 铁道部沈阳桥梁工厂 | Heat treatment for steel spring-strip |
| JP3544131B2 (en) * | 1999-01-14 | 2004-07-21 | 株式会社日本製鋼所 | Manufacturing method of medium carbon steel |
| CN101421425A (en) * | 2006-04-11 | 2009-04-29 | 日立金属株式会社 | Method of pretreatment for quenching of martensitic tool steel and method of quenching |
-
2009
- 2009-07-09 CN CNA2009103041801A patent/CN101597681A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1067684A (en) * | 1991-06-15 | 1993-01-06 | 徐厚国 | Hot treating method for elastic parts |
| CN1108699A (en) * | 1994-12-28 | 1995-09-20 | 铁道部沈阳桥梁工厂 | Heat treatment for steel spring-strip |
| JP3544131B2 (en) * | 1999-01-14 | 2004-07-21 | 株式会社日本製鋼所 | Manufacturing method of medium carbon steel |
| CN101421425A (en) * | 2006-04-11 | 2009-04-29 | 日立金属株式会社 | Method of pretreatment for quenching of martensitic tool steel and method of quenching |
Non-Patent Citations (1)
| Title |
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| 邹志勇等: "DJ4热卷弹簧纵向裂纹的原因分析和解决措施", 《理化检验-物理分册》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101818240A (en) * | 2010-03-22 | 2010-09-01 | 马鞍山钢铁股份有限公司 | Thermal processing method for medium carbon silicon manganese low alloy steel railway wheel |
| CN101818240B (en) * | 2010-03-22 | 2011-06-15 | 马鞍山钢铁股份有限公司 | Thermal processing method for medium carbon silicon manganese low alloy steel railway wheel |
| CN102626844A (en) * | 2012-03-16 | 2012-08-08 | 杭州兴发弹簧有限公司 | Producing technology of rail shock-insulating spring |
| CN110468263A (en) * | 2019-09-12 | 2019-11-19 | 北京理工大学 | A kind for the treatment of process obtaining the advanced high-strength steel of high-strength and high ductility |
| CN112251679A (en) * | 2020-09-18 | 2021-01-22 | 东南大学 | Double-phase high-strength steel and preparation method thereof |
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Application publication date: 20091209 |