CN1080764C - Railway elastic strip of low alloy steel and its heat treatment method - Google Patents
Railway elastic strip of low alloy steel and its heat treatment method Download PDFInfo
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- CN1080764C CN1080764C CN98113921A CN98113921A CN1080764C CN 1080764 C CN1080764 C CN 1080764C CN 98113921 A CN98113921 A CN 98113921A CN 98113921 A CN98113921 A CN 98113921A CN 1080764 C CN1080764 C CN 1080764C
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Abstract
The present invention discloses an elastic strip prepared from common low-alloy steel for a railroad elastic strip fastener and a thermal treating method thereof. Thermal treatment is applied to the common low-alloy steel, the metallographic structure of the common low-alloy steel is low-carbon martensite, and the common low-alloy steel has appropriate mechanical properties. Particularly, the common low-alloy steel has the advantages of good plasticity, small decarburizing tendency, small brittle failure tendency and manufacturing cost reduction. The common low-alloy steel is used for producing the elastic strip for a railroad elastic strip fastener.
Description
The present invention relates to a kind of spring and heat treating method that is used to make the railway elastic bar fastener that connects rail and concrete sleeper.
At present, press TB/T 1495.1～5-92＜spring I type fastener〉regulation, carbon superior alloy steel or senior superior alloy steel 60Si2Mn or 55Si2Mn during the spring of railway elastic bar fastener all adopts, its carbon content is between 0.50～0.65%.Demanding strict technology of spring, static load residual set≤1mm, decarburized layer deepness≤0.3mm also has hardness, fatigue lifetime and residual set, requirements such as metallographic structure, but this type of steel carbon amount is higher, and fragility is bigger; Sulphur phosphorus content narrow range, price is higher; Oil quenching is adopted in thermal treatment, and problems such as pollution are arranged.
It is the patent application of 95113929.0 " a kind of alloy steel spring and heat treating methods thereof " that Gazette of Patent for Invention the 13rd volume discloses application number No. 1, is that reinforced bar steel 20MnSi, the 20MnSiV etc. of phosphorus≤0.045%, sulphur≤0.045% make spring with material.Carbon content by GB1499-91 " Steel Concrete hot rolled ribbed steel bar " regulation 20MnSi 20MnSiV is 0.15～0.25%.Railway elastic bar is as making with the steel of these two kinds of trades mark, when carbon content 0.20% when following, its static load residual set, fatigue lifetime and residual set even hardness after the thermal treatment, the requirement that does not reach bar usually.
The present invention seeks to provide material, the reduction spring manufacturing cost of a class cheapness for the spring of railway elastic bar fastener; Change the thermal treatment means, simplify technology, reduce and pollute, reduce fragility; Except that metallographic structure is that low carbon martensite is advised for the tempered sorbite, all the other all satisfy the various performance requriementss of TB/T1495.1～5-92 to spring.
For achieving the above object, railway elastic strip of low alloy steel of the present invention, used steel is phosphorous by weight≤and 0.045%, sulphur≤0.045%, manganese≤0.40～1.80%, silicon 0.40～1.00%, its carbon content is 0.20～0.35%.
Used steel also can contain vanadium≤0.30%, and vanadium can use titanium≤0.30% to replace, or compound adding.
Heat treating method of the present invention is whole heating of spring material base or whole induction heating, 840～1050 ℃ of temperature ranges, utilize the waste heat shrend after the thermoforming, low-temperaturetempering again, be characterized in 200～400 ℃ of tempering ranges, the gained metallographic structure is to contain a little ferrite in the low-carbon martensite of uniformity or the low-carbon martensite.
The present invention has following effect: because used steel 25MnSi, 25MnSiV, 30MnSiV contain scope is 0.20～0.35% carbon and other alloying element, so spring to Φ 13～20mm diameter, after heat treatment low-carbon martensite be can obtain, hardness, static load residual set, fatigue lifetime and the residual set of railway elastic bar, every requirement of decarburized layer deepness satisfied.Since lower than middle carbon spring steel carbon content, so reduced the fragility of spring; Because the thermal treatment shrend is so eliminated fume pollution.Because the phosphorus sulphur content wide ranges of used steel is more cheap than spring steel, so reduced the spring manufacturing cost.
Owing to also contain trace alloying element vanadium, titanium etc. in the steel, the energy crystal grain thinning further improves obdurability.
Below in conjunction with embodiment, spring to the ordinary low-alloy steel railway fastener that the present invention relates to is described in further detail, and the used material of spring of this railway elastic bar fastener mainly is described and produces heat-treatment technology method after the railway elastic bar fastening elastic rod shapes with usual method.
Embodiment 1.
Material is ordinary low-alloy steel 25MnSi, and chemical ingredients is 0.24%C, 0.50%Si, 1.42%Mn, 0.042%S, 0.032%P.
Thermal treatment process is 930 ℃ of heating, shrend, 300 ℃ of tempering; The metallographic structure of gained is a low-carbon martensite after the thermal treatment, and mechanical property is δ
0.2=1220～1280MPa, δ
bThe spring of railway elastic bar fastener is made after 2,000,000 tired only 0.1～0.41mm of permanent residual set amount that impact in=1420～1440MPa, δ=6.0～6.5%, ψ=40.5～42.0%.
Embodiment 2.
Material is ordinary low-alloy steel 30MnSiV, and chemical ingredients is 0.27%C, 0.60%Si, 1.50%Mn, 0.042%P, 0.02%S, 0.05%V.
Thermal treatment process is 930 ℃ of whole induction heating, utilizes the waste heat shrend after the shaping, 340 ℃ of tempering.The tissue of thermal treatment gained is a low carbon martensite, and mechanical property is δ
0.2=1250～1260MPa, δ
b=1440～1445MPa, δ=6.3～6.9%, ψ=40.1～41.3%.
Example 3.
Material is ordinary low-alloy steel 25MnSiV, and chemical ingredients is 0.24%C, 0.83%Si, 1.24%Mn, 0.06%V, 0.022%P, 0.02%S.Thermal treatment process is 900～950 ℃ of induction heating, shrend, 250～340 ℃ of tempering.The gained metallographic structure is that low-carbon martensite or low carbon martensite add ferritic structure, mechanical property δ after the thermal treatment
0.2=1190-1310MPa δ
b=1310～1520MPa δ=6.8～8.7% ψ=38.6～46.3%.
Claims (3)
1, a kind of railway elastic strip of low alloy steel, used steel is phosphorous by weight≤and 0.045%, sulphur≤0.045%, manganese≤0.40～1.80%, silicon 0.40～1.00%, it is characterized in that: carbon containing 0.20～0.35%.
2, spring according to claim 1 is characterized in that: also contain vanadium≤0.30%, vanadium can use titanium≤0.30% to replace, or compound adding.
3, the heat treating method of the described spring of a kind of claim 1, whole heating of spring material base or whole induction heating, 840～1050 ℃ of temperature ranges, utilize the waste heat shrend after the thermoforming, low-temperaturetempering again, it is characterized in that: 200～400 ℃ of tempering ranges, gained metallographic structure are to contain a little ferrite in the low-carbon martensite of uniformity or the low-carbon martensite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98113921A CN1080764C (en) | 1998-04-16 | 1998-04-16 | Railway elastic strip of low alloy steel and its heat treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98113921A CN1080764C (en) | 1998-04-16 | 1998-04-16 | Railway elastic strip of low alloy steel and its heat treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1232089A CN1232089A (en) | 1999-10-20 |
| CN1080764C true CN1080764C (en) | 2002-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98113921A Expired - Fee Related CN1080764C (en) | 1998-04-16 | 1998-04-16 | Railway elastic strip of low alloy steel and its heat treatment method |
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| Country | Link |
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| CN (1) | CN1080764C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102002561B (en) * | 2010-12-15 | 2012-06-20 | 南车资阳机车有限公司 | C-grade steel heat treatment method |
| CN106435367B (en) * | 2016-11-23 | 2018-07-10 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of bainite rail and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1108699A (en) * | 1994-12-28 | 1995-09-20 | 铁道部沈阳桥梁工厂 | Heat treatment for steel spring-strip |
| CN1139155A (en) * | 1995-11-14 | 1997-01-01 | 丁志敏 | Alloy steel spring and its heat treatment method |
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1998
- 1998-04-16 CN CN98113921A patent/CN1080764C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1108699A (en) * | 1994-12-28 | 1995-09-20 | 铁道部沈阳桥梁工厂 | Heat treatment for steel spring-strip |
| CN1139155A (en) * | 1995-11-14 | 1997-01-01 | 丁志敏 | Alloy steel spring and its heat treatment method |
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| Publication number | Publication date |
|---|---|
| CN1232089A (en) | 1999-10-20 |
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