CN1487111A - Carbon rail steel for heat treatment - Google Patents
Carbon rail steel for heat treatment Download PDFInfo
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- CN1487111A CN1487111A CNA031354971A CN03135497A CN1487111A CN 1487111 A CN1487111 A CN 1487111A CN A031354971 A CNA031354971 A CN A031354971A CN 03135497 A CN03135497 A CN 03135497A CN 1487111 A CN1487111 A CN 1487111A
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- thermal treatment
- rail steel
- steel
- impurity
- rail
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Abstract
The carbon rail steel includes C 0.66-0.86 wt%, Si 0.15-0.35 wt% and Mn 0.7-1.00 wt% except Fe, trace elements and impurity. According to its CCT curve, the carbon rail steel has wide cooling speed range of whole fine pearlite structure and easy-to-control heat treatment process. Via the proper heat treatment with controlled temperature, cooling speed and relevant parameters, the carbon rail steel may have hardened layer depth greater than 15 mm, reasonable hardness distribution, high strength and high toughness.
Description
Technical field
The present invention relates to a kind of steel, especially a kind of thermal treatment carbon steel rail steel.
Background technology
At present, to the reinforcement of steel, especially the reinforcement of rail generally is to adopt alloy strengthening and heat treatment reinforcement.To rail is to adopt alloy strengthening or heat treatment reinforcement, need take all factors into consideration the factors such as consumption of alloy resource, transportation by railroad intensity and the rail of a country.Generally speaking, the alloying element that the rail consumption of a country is less, transportation by railroad intensity is little and be rich in the reinforcement rail again then should adopt alloy strengthening to rail.Otherwise, then should heat-treat reinforcement to rail.For example: USSR (Union of Soviet Socialist Republics), the U.S., Japan etc. are always based on the development heat-treated rail, and some countries of West Europe are based on development alloy strengthening rail.China is at present with the rail of hot rolling attitude delivery, and main steel grade has U71Mn, PD3 and BNbRE etc., and with the rail of as-heat-treated condition delivery, main steel grade has U71Mn and PD3.For heat-treated rail, obtain good obdurability, must make rail thermal treatment hardened layer obtain full nodular troostite tissue.Therefore, except that on heat treatment technics, the quench cooling rate of rail being controlled, the width degree that steel grade itself obtains the speed of cooling scope of full nodular troostite tissue plays important effect, and it will influence the stable of thermal treatment process technology research and quality product.Reach the U71Mn heat-treated rail of 1180MPa for tensile strength, owing to increase the content higher (Mn:1.0～1.5%) of the hardening capacity element manganese of steel, make this rail obtain the speed of cooling narrow range of full nodular troostite tissue, according to the CCT curve of measuring (continuous cooling transformation curve), its speed of cooling that obtains full nodular troostite tissue is 0.5～5.5 ℃/s, thereby increased the thermal treatment process control difficulty of rail greatly, simultaneously, manganese content height is easy to generate regional segregation, more is unfavorable for obtaining full nodular troostite tissue.Reach the PD3 heat-treated rail of the little vanadium of high silicon of 1400MPa for tensile strength, Si content in the invar higher (Si:0.60～0.90%), the Si of this content, in eutectoid and hypoeutectoid steel, will reduce the critical cooling velocity of steel, C curve (Supercooled Austenite Isothermal Transformation Diagram) is moved to right, V solid solution simultaneously also has similar effect in austenite, therefore it is also narrower that this steel grade obtains the speed of cooling scope of full nodular troostite tissue, according to the CCT curve of measuring, its speed of cooling that obtains full nodular troostite tissue is 1.0～3.0 ℃/s, makes that the thermal treatment process control difficulty of this rail steel is also big than the U71Mn rail steel.
Summary of the invention
In order to overcome existing heat-treated steel rail steel speed of cooling narrow range, make the big deficiency of thermal treatment process control difficulty to the invention provides a kind of speed of cooling wide ranges, thereby the thermal treatment carbon steel rail steel of the easy control of thermal treatment process.
The technical solution adopted for the present invention to solve the technical problems is: thermal treatment carbon steel rail steel, it is characterized in that: its main chemical by weight percentage, comprise: 0.66～0.86%C, 0.15～0.35%Si, 0.7～1.00%Mn, all the other are iron, other trace element and impurity.
The invention has the beneficial effects as follows, adopt the thermal treatment carbon steel rail steel of above-mentioned main chemical, according to the CCT curve of measuring, it obtains the speed of cooling wide ranges of full nodular troostite tissue, and thermal treatment process is controlled easily.By relevant heat treatment process parameters such as control proper heat treatment temperature and speed of cooling, case depth is reasonable greater than 15mm and Hardness Distribution, tensile strength sigma
bBe 1100～1400MPa, elongation δ
5Be 10～15%, normal temperature impelling strength a
kBe 14～33J/cm
2, have intensity height, over-all properties that plasticity and toughness are good.
Embodiment
Thermal treatment of the present invention carbon steel rail steel, its main chemical comprises by weight percentage: 0.66～0.86%C, 0.15～0.35%Si, 0.7～1.00%Mn, all the other are iron, other trace element and impurity.In the described impurity, by weight percentage: P＜0.035%, S＜0.035%.According to the CCT curve of measuring, its speed of cooling that obtains full nodular troostite tissue is 0.5～25 ℃/s, the speed of cooling wide ranges, thereby thermal treatment process is controlled easily.By relevant heat treatment process parameters such as control proper heat treatment temperature and speed of cooling, can make case depth reasonable, its tensile strength sigma greater than 15mm and Hardness Distribution
bBe 1100～1400MPa, elongation δ
5Be 10～15%, normal temperature impelling strength a
kBe 14～33J/cm
2, have intensity height, over-all properties that plasticity and toughness are good.
Embodiment 1: thermal treatment of the present invention carbon steel rail steel, its main chemical comprises by weight percentage: 0.66%C, 0.15%Si, 0.70%Mn, all the other are iron, other trace element and impurity.In its impurity, by weight percentage: 0.005%P, 0.005%S.This thermal treatment can obtain the metallographic structure of full nodular troostite with the carbon steel rail steel, and mechanical property is: σ
b-1120MPa, δ
5-15%, a
k-30J/cm
2
Embodiment 2: thermal treatment of the present invention carbon steel rail steel, its main chemical comprises by weight percentage: 0.68%C, 0.21%Si, 0.78%Mn, all the other are iron, other trace element and impurity.In its impurity, by weight percentage: 0.021%P, 0.015%S.This thermal treatment can obtain the metallographic structure of full nodular troostite with the carbon steel rail steel, and mechanical property is: σ
b-1130MPa, δ
5-14%, a
k-27J/cm
2
Embodiment 3: thermal treatment of the present invention carbon steel rail steel, its main chemical comprises by weight percentage: 0.76%C, 0.23%Si, 0.90%Mn, all the other are iron, other trace element and impurity.In its impurity, by weight percentage: 0.014%P, 0.018%S.This thermal treatment can obtain the metallographic structure of full nodular troostite with the carbon steel rail steel, and mechanical property is: σ
b-1210MPa, δ
5-12%, a
k-23J/cm
2
Embodiment 4: thermal treatment of the present invention carbon steel rail steel, its main chemical comprises by weight percentage: 0.82%C, 0.27%Si, 0.9%Mn, all the other are iron, other trace element and impurity.In its impurity, by weight percentage: 0.023%P, 0.011%S.This thermal treatment can obtain the metallographic structure of full nodular troostite with the carbon steel rail steel, and mechanical property is: σ
b-1350MPa, δ
5-11%, a
k-18J/cm
2
Embodiment 5: thermal treatment of the present invention carbon steel rail steel, its main chemical comprises by weight percentage: 0.86%C, 0.35%Si, 1.0%Mn, all the other are iron, other trace element and impurity.In its impurity, by weight percentage: 0.035%P, 0.035%S.This thermal treatment can obtain the metallographic structure of full nodular troostite with the carbon steel rail steel, and mechanical property is: σ
b-1400MPa, δ
5-10%, a
k-15J/cm
2
Claims (7)
1, thermal treatment carbon steel rail steel, it is characterized in that: its main chemical comprises by weight percentage: 0.66～0.86%C, 0.15～0.35%Si, 0.7～1.00%Mn, all the other are iron, other trace element and impurity.
2, thermal treatment as claimed in claim 1 carbon steel rail steel, it is characterized in that: described main chemical comprises by weight percentage: 0.66%C, 0.15%Si, 0.70%Mn, all the other are iron, other trace element and impurity.
3, thermal treatment as claimed in claim 1 carbon steel rail steel, it is characterized in that: described main chemical comprises by weight percentage: 0.68%C, 0.21%Si, 0.78%Mn, all the other are iron, other trace element and impurity.
4, thermal treatment as claimed in claim 1 carbon steel rail steel, it is characterized in that: described main chemical comprises by weight percentage: 0.76%C, 0.23%Si, 0.9%Mn, all the other are iron, other trace element and impurity.
5, thermal treatment as claimed in claim 1 carbon steel rail steel, it is characterized in that: described main chemical comprises by weight percentage: 0.82%C, 0.27%Si, 0.9%Mn, all the other are iron, other trace element and impurity.
6, thermal treatment as claimed in claim 1 carbon steel rail steel, it is characterized in that: described main chemical comprises by weight percentage: 0.86%C, 0.35%Si, 1.00%Mn, all the other are iron, other trace element and impurity.
7, as any described thermal treatment carbon steel rail steel of claim 1 to 6, it is characterized in that: in the described impurity, by weight percentage, comprising: 0.005～0.035%P, 0.005～0.035%S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031354971A CN1487111A (en) | 2003-07-29 | 2003-07-29 | Carbon rail steel for heat treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031354971A CN1487111A (en) | 2003-07-29 | 2003-07-29 | Carbon rail steel for heat treatment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1487111A true CN1487111A (en) | 2004-04-07 |
Family
ID=34154667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031354971A Pending CN1487111A (en) | 2003-07-29 | 2003-07-29 | Carbon rail steel for heat treatment |
Country Status (1)
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| CN (1) | CN1487111A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101948983B (en) * | 2009-07-10 | 2012-06-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Preparation method of rail steel |
| CN103014486A (en) * | 2012-12-08 | 2013-04-03 | 内蒙古包钢钢联股份有限公司 | Steel special for high-strength heat-treated steel rail |
| CN103060674A (en) * | 2011-10-20 | 2013-04-24 | 上海田岛工具有限公司 | High toughness and high elasticity tape spring material |
| CN104480390A (en) * | 2015-01-07 | 2015-04-01 | 攀钢集团攀枝花钢铁研究院有限公司 | High-impact-toughness steel rail and production method thereof |
| CN106978567A (en) * | 2017-05-15 | 2017-07-25 | 内蒙古包钢钢联股份有限公司 | Anti- stray electrical current low resistance rail of subway material and its production method |
-
2003
- 2003-07-29 CN CNA031354971A patent/CN1487111A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101948983B (en) * | 2009-07-10 | 2012-06-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Preparation method of rail steel |
| CN103060674A (en) * | 2011-10-20 | 2013-04-24 | 上海田岛工具有限公司 | High toughness and high elasticity tape spring material |
| CN103014486A (en) * | 2012-12-08 | 2013-04-03 | 内蒙古包钢钢联股份有限公司 | Steel special for high-strength heat-treated steel rail |
| CN104480390A (en) * | 2015-01-07 | 2015-04-01 | 攀钢集团攀枝花钢铁研究院有限公司 | High-impact-toughness steel rail and production method thereof |
| CN106978567A (en) * | 2017-05-15 | 2017-07-25 | 内蒙古包钢钢联股份有限公司 | Anti- stray electrical current low resistance rail of subway material and its production method |
| CN106978567B (en) * | 2017-05-15 | 2018-12-25 | 内蒙古包钢钢联股份有限公司 | Anti- stray electrical current low resistance rail of subway material and its production method |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |