CN101148736A - Steel rail and production method thereof - Google Patents
Steel rail and production method thereof Download PDFInfo
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- CN101148736A CN101148736A CNA2007102025304A CN200710202530A CN101148736A CN 101148736 A CN101148736 A CN 101148736A CN A2007102025304 A CNA2007102025304 A CN A2007102025304A CN 200710202530 A CN200710202530 A CN 200710202530A CN 101148736 A CN101148736 A CN 101148736A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 title abstract description 8
- 239000010959 steel Substances 0.000 title abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 6
- 235000013619 trace mineral Nutrition 0.000 claims abstract description 6
- 239000011573 trace mineral Substances 0.000 claims abstract description 6
- 238000010791 quenching Methods 0.000 claims description 54
- 238000007669 thermal treatment Methods 0.000 claims description 8
- 239000004615 ingredient Substances 0.000 claims description 5
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 abstract 1
- 239000000203 mixture Substances 0.000 abstract 1
- 238000001816 cooling Methods 0.000 description 10
- 238000005096 rolling process Methods 0.000 description 9
- 238000009826 distribution Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000010408 sweeping Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005282 brightening Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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Abstract
The invention discloses a steel rail with good contact fatigue damage resistance and a production method thereof in the field of metallurgy. The steel rail of the invention has the chemical composition C of 0.61%, (up to one)0.73 percent of Si, 0.20 to 0.50 percent of Mn, 0.80 to 1.30 percent of Mn and the balance of Fe and other trace elements, and the tensile strength R of the alloymNot less than 1080MPa, and the fracture toughness KIC not less than 45 MPa-m1/2. The steel rail shows good contact fatigue damage resistance and comprehensive use effect in actual use. The production method of the steel rail comprises the step of carrying out on-line heat treatment on the rolled and formed steel rail, wherein the rail head, the rail web and the rail bottom of the steel rail are quenched and cooled simultaneously. The rail head, the rail web and the rail bottom of the rail are simultaneously quenched and cooled to ensure that the rail achieves the tensile strength RmMore than or equal to 1080MPa, fracture toughness KIC≥45MPa·m1/2。
Description
Technical field
The present invention relates to field of metallurgy, relate in particular to the production method of a kind of rail and this rail.
Background technology
Along with the development of transportation by railroad, the travelling speed of train improves constantly, and the speed of a motor vehicle of most of circuits all reaches more than the 90km/h.When the speed of a motor vehicle surpassed 90km/h, the principal element that influence rail work-ing life no longer was to wear and tear, but rolling contact fatigue.Rolling contact fatigue can cause disconnected rail, causes overturn accident.Because the rolling contact fatigue of rail seriously jeopardizes traffic safety, therefore must develop the rail of anti-rolling contact fatigue excellent property.Improve the anti-rolling contact fatigue performance of rail, need on the basis that suitably guarantees rail tensile strength, improve the toughness of rail.
Existing rail is to be that 0.70%～0.82% continuous casting steel billet is rolled into rail by universal mill with carbon content, and rail implemented online thermal treatment, make the rail tissue that is in austenitic state change perlite into, thereby improve the intensity and the toughness of rail by quench cooled.Such rail strength is higher, and wear resistance is good, and use in the outstanding low speed that is adapted at wearing and tearing, sharp radius curve highway section.But in the speed of a motor vehicle faster on straight line highway section or the sweeping curve highway section, the rolling contact fatigue of rail is more outstanding with respect to wearing and tearing, but because the anti-rolling contact fatigue performance of this type of rail is not good, the rail surface is easy to generate contact fatigue crackle hurt, and traffic safety is caused a hidden trouble.
Summary of the invention
Technical problem to be solved by this invention is: a kind of good rail of the anti-rolling contact fatigue performance used on quick straight line and the sweeping curve highway section and production method of this rail of being adapted at is provided.
Solving the problems of the technologies described above employed technical scheme is: rail, chemical ingredients are C=0.61%～0.73%, Si=0.20%～0.50%, the Fe of Mn=0.80%～1.30% and equal amount and other trace elements, its tensile strength R
m〉=1080MPa, fracture toughness property K
IC〉=45 MPam
1/2
The production method of this rail comprises the rail behind the roll forming is implemented online thermal treatment, and wherein, rail head, the web of the rail, the flange of rail to rail carries out quench cooled simultaneously.
Further be to use pressurized air that rail is carried out quench cooled.
Further be compressed-air actuated pressure 〉=0.02 MPa ,≤0.08MPa.
Further be that the quench cooled intensity of rail head of rail is greater than the quench cooled intensity of the rail web of the rail, the flange of rail.
Further be, length direction along rail is provided with three row's nozzles respectively above the tread of rail head, respectively be provided with respectively the two row's nozzles that are provided with along the length direction of rail in the two sides of rail head, respectively be provided with the row's nozzle that is provided with along the length direction of rail in the two sides of the web of the rail, below the flange of rail, be provided with row's nozzle rail is implemented quench cooled along the length direction of rail.
Further be, the temperature of rail is 740 ℃～800 ℃ before the quench cooled, and the quench cooled time is 110 seconds～120 seconds.
The invention has the beneficial effects as follows: rail of the present invention, its tensile strength R
m〉=1080MPa, yield strength R
0.2P〉=750MPa, unit elongation A 〉=12%, fracture toughness property K
IC〉=45 MPam
1/2The crack initiation speed and the crack growth rate of rail are lower than existing rail, and show good anti-rolling contact fatigue performance and comprehensive result of use when reality is used: this rail is 9,000 ten thousand tons at average speed as 160km/h, annual traffic, radius of curve is to use on the circuit of 10km after 1 year, the side grinding of rail and the mill that hangs down are all less than 1.0mm, and contact fatigue crackle, surface-brightening do not appear in the rail surface.
The present invention produces the method for rail, carries out quench cooled by rail head, the web of the rail, the flange of rail to rail simultaneously, can improve the intensity of the rail web of the rail and the flange of rail, can improve the bulk strength of rail thus; Rail head, the web of the rail, the flange of rail to rail carries out the temperature head that quench cooled can reduce rail head, the web of the rail and the flange of rail simultaneously, effectively control the deflection of rail in the thermal treatment process of cooling, reduce the flexural deformation of rail, reduce the unrelieved stress of rail, further improve the performance of rail, make rail reach tensile strength R
m〉=1080MPa, fracture toughness property K
IC〉=45 MPam
1/2, and have good comprehensive use properties.
Description of drawings
Fig. 1 is for carrying out the synoptic diagram of quench cooled to rail of the present invention.
Fig. 2 carries out rail head hardened layer hardness distribution after the quench cooled for 1 pair of rail of the present invention of embodiment.
Fig. 3 carries out rail head hardened layer hardness distribution after the quench cooled for 2 pairs of rail of the present invention of embodiment.
Be labeled as among the figure: rail head 1, the web of the rail 2, the flange of rail 3, nozzle 4, nozzle 5, nozzle 6, nozzle 7, nozzle 8, nozzle 9, nozzle 10, nozzle 11, nozzle 12.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
Rail of the present invention, chemical ingredients are C=0.61%～0.73%, Si=0.20%～0.50%, the Fe of Mn=0.80%～1.30% and equal amount and other trace elements, its tensile strength R
m〉=1080MPa, fracture toughness property K
IC〉=45 MPam
1/2
The production method of above-mentioned rail as Fig. 1, comprises the rail behind the roll forming is implemented online thermal treatment, and wherein, rail head 1, the web of the rail 2, the flange of rail 3 to rail carries out quench cooled simultaneously.
For the speed of cooling that guarantees hardening of rails when cooling is even, with the full nodular troostite tissue that obtains requiring, thereby make rail in use avoid peeling off the piece hurt, employing pressurized air carries out quench cooled to rail.
Too fast and produce harmful tissues such as bainite or martensite, compressed-air actuated pressure 〉=0.02 MPa ,≤0.08MPa for fear of the quench cooling rate of rail.
Because the area of section of rail head 1 is greater than the web of the rail 2 and the flange of rail 3, so the thermal capacity of rail head 1 is greater than the web of the rail 2 and the flange of rail 3.If rail head 1 is identical with the cooling intensity of the web of the rail 2, the flange of rail 3, then the speed of cooling of rail head 1 will be lower than the web of the rail 2 and the flange of rail 3, and rail head 1 also just can not get the tissue and the performance that require.As Fig. 1, for tissue and the performance that guarantees that rail head 1 obtains requiring.The quench cooled intensity of rail head 1 is greater than the quench cooled intensity of the web of the rail 2, the flange of rail 3.
In order to guarantee 1 quench cooled intensity quench cooled intensity greater than the web of the rail 2, the flange of rail 3, as Fig. 1, length direction along rail is provided with three row's nozzles 4,5,6 respectively above the tread of rail head 1, respectively be provided with respectively the two row's nozzles 7,8 and 9,10 that are provided with along the length direction of rail in the two sides of rail head 1, respectively be provided with the row's nozzle 11 and 12 that is provided with along the length direction of rail in the two sides of the web of the rail 2, the length direction along rail below the flange of rail 3 is provided with 13 pairs of rail enforcement of row's nozzle quench cooled.
In order after the hardening of rails cooling, to obtain the thinner pearlitic structure of grain fineness number, improve the intensity and the toughness of rail, the temperature of rail is 740 ℃～800 ℃ before the quench cooled, the quench cooled time is 110 seconds～120 seconds.
Wherein, above-mentioned every row's nozzle is formed by a plurality of nozzles that are provided with at interval along the length direction of rail.When rail carries out quench cooled, rail along its length direction at the uniform velocity pass through nozzle, thereby cool off fast.The quantity of every row's nozzle decides according to the quench cooled time of rail, the movement velocity of rail, promptly by the movement velocity of rail and the quantity that calculates nozzle cooling time that must reach.
Rail, chemical ingredients are C=0.63%, Si=0.22%, Mn=1.05%, Fe=97.95% and other trace elements 0.15%.This rail is by behind the universal mill hot-roll forming, utilizes the waste heat after the hot rolling to carry out online thermal treatment again, and rail is carried out quench cooled.The temperature that rail carries out before the quench cooled is 750 ℃, and 110 seconds quench cooled time, rail head 1, the web of the rail 2, the flange of rail 3 to rail carries out quench cooled simultaneously when quench cooled.Carry out quench cooled by rail head 1, the web of the rail 2, the flange of rail 3 to rail simultaneously, under the condition that guarantees tissue that rail head 1 obtains requiring and performance, can improve the intensity of the web of the rail 2 and the flange of rail 3, can improve the bulk strength of rail thus; Rail head 1, the web of the rail 2, the flange of rail 3 to rail carries out the temperature head that quench cooled can reduce rail head 1, the web of the rail 2 and the flange of rail 3 simultaneously, effectively control the deflection of rail in the thermal treatment process of cooling, reduce the flexural deformation of rail, reduce the unrelieved stress of rail, further improve the use properties of rail.
Wherein, the quench cooled intensity of rail head 1 is greater than the quench cooled intensity of the web of the rail 2, the flange of rail 3, can guarantee that like this rail head 1, the web of the rail 2, the flange of rail 3 speed of cooling are identical.As Fig. 1, three row's nozzles 4,5,6 are set at the tread position of rail head 1, in the two sides of rail head 1 two row's nozzles 7,8 and 9,10 are set respectively, row's nozzle 11 and 12 respectively is set in the two sides of the web of the rail 2,13 pairs of rail of row's nozzle are set below the flange of rail 3 implement quench cooled.Wherein, compressed-air actuated pressure is 0.075MPa.
As Fig. 2, rail is carried out rail head hardened layer hardness distribution after the quench cooled by aforesaid method.The cooled yield strength R of this hardening of rails
0.2PBe 750MPa, tensile strength R
mBe 1100MPa, unit elongation A is 12.5%, fracture toughness property K
ICBe 48MPam
1/2
Rail, chemical ingredients is: C=0.72%, Si=0.31%, Mn=1.25%, Fe=97.54% and other trace elements of 0.18%.This rail is by behind the universal mill hot-roll forming, utilizes the waste heat after the hot rolling to carry out online thermal treatment again, and rail is carried out quench cooled.Rail carries out 790 ℃ of the preceding temperature of quench cooled, and 118 seconds quench cooled time, rail head 1, the web of the rail 2, the flange of rail 3 to rail carries out quench cooled simultaneously when quench cooled.
Wherein, the quench cooled intensity of rail head 1 is greater than the quench cooled intensity of the web of the rail 2, the flange of rail 3.As Fig. 1, three row's nozzles 4,5,6 are set at the tread position of rail head 1, in the two sides of rail head 1 two row's nozzles 7,8 and 9,10 are set respectively, row's nozzle 11 and 12 respectively is set in the two sides of the web of the rail 2,13 pairs of rail of row's nozzle are set below the flange of rail 3 implement quench cooled.Wherein, compressed-air actuated pressure is 0.08MPa.
As Fig. 3, rail is carried out rail head hardened layer hardness distribution after the quench cooled by aforesaid method.The cooled yield strength R of this hardening of rails
0.2PBe 790MPa, tensile strength R
mBe 1130MPa, unit elongation A is 12.0%, fracture toughness property K
ICBe 46MPam
1/2
Claims (8)
1. rail, chemical ingredients is C=0.61%～0.73%, Si=0.20%～0.50%, the Fe of Mn=0.80%～1.30% and equal amount and other trace elements, its tensile strength R
m〉=1080MPa, fracture toughness property K
IC〉=45MPam
1/2
2. the production method of the rail of claim 1 comprises the rail behind the roll forming is implemented online thermal treatment, it is characterized in that: rail head (1), the web of the rail (2), the flange of rail (3) to rail carries out quench cooled simultaneously.
3. the production method of rail as claimed in claim 2 is characterized in that: use pressurized air that rail is carried out quench cooled.
4. the production method of rail as claimed in claim 3 is characterized in that: compressed-air actuated pressure 〉=0.02MPa ,≤0.08MPa.
5. as the production method of any described rail of claim in the claim 2～4, it is characterized in that: the quench cooled intensity of rail head (1) is greater than the quench cooled intensity of the web of the rail (2), the flange of rail (3).
6. the production method of rail as claimed in claim 5, it is characterized in that: the tread top at rail head (1) is provided with three row's nozzles (4,5,6) along the length direction of rail respectively, respectively be provided with respectively the two row's nozzles (7,8) and (9,10) that are provided with along the length direction of rail in the two sides of rail head (1), respectively be provided with the row's nozzle (11) and (12) that is provided with along the length direction of rail in the two sides of the web of the rail (2), be provided with row's nozzle (13) in the flange of rail (3) below along the length direction of rail rail is implemented quench cooled.
7. the production method of rail as claimed in claim 6 is characterized in that: the temperature of rail is 740 ℃～800 ℃ before the quench cooled, and the quench cooled time is 110 seconds～120 seconds.
8. as the production method of any described rail of claim in the claim 2～4, it is characterized in that: the temperature of rail is 740 ℃～800 ℃ before the quench cooled, and the quench cooled time is 110 seconds～120 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007102025304A CN101148736A (en) | 2007-11-14 | 2007-11-14 | Steel rail and production method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007102025304A CN101148736A (en) | 2007-11-14 | 2007-11-14 | Steel rail and production method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN101148736A true CN101148736A (en) | 2008-03-26 |
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|---|---|---|---|
| CNA2007102025304A Pending CN101148736A (en) | 2007-11-14 | 2007-11-14 | Steel rail and production method thereof |
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Cited By (16)
| 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 |
| CN102643971A (en) * | 2012-04-12 | 2012-08-22 | 东北大学 | Online thermal treatment device for heavy rail |
| CN103131826A (en) * | 2013-02-26 | 2013-06-05 | 内蒙古包钢钢联股份有限公司 | Steel rail on-line wind-jet quenching heat treatment simulation experiment device |
| CN104561496A (en) * | 2014-12-25 | 2015-04-29 | 内蒙古科技大学 | Spray cooling experiment device for thermal treatment of steel rail |
| CN107081336A (en) * | 2017-05-27 | 2017-08-22 | 陈金昌 | The controllable rolling of railway switch tongue Warm status and immediate quenching technique |
| CN107227429A (en) * | 2017-06-19 | 2017-10-03 | 武汉钢铁有限公司 | A kind of production method of the rail containing B |
| CN109234611A (en) * | 2018-08-16 | 2019-01-18 | 包头钢铁（集团）有限责任公司 | The milling method of rail, the smelting process of rail and rail |
| CN109402520A (en) * | 2018-11-02 | 2019-03-01 | 包头钢铁（集团）有限责任公司 | One kind is containing low temperature resistant wear-resisting heat-treated rail of rare earth and preparation method thereof |
| CN109825686A (en) * | 2019-03-19 | 2019-05-31 | 上海交通大学 | A quenching and cooling device for evenly spraying water along the rail head profile on the rail line |
| CN110358904A (en) * | 2019-05-30 | 2019-10-22 | 邯郸钢铁集团有限责任公司 | The control method of rail shape after rail burning optimization on line |
| WO2020057538A1 (en) * | 2018-09-19 | 2020-03-26 | 武汉钢铁有限公司 | Steel rail inline heat treatment flatness control method |
| JP2021505772A (en) * | 2017-12-12 | 2021-02-18 | ポスコＰｏｓｃｏ | Heat treatment curable high carbon steel sheet and its manufacturing method |
| CN113403465A (en) * | 2021-05-18 | 2021-09-17 | 邯郸钢铁集团有限责任公司 | Method for controlling uniformity of structure performance of two sides of heat-treated steel rail head |
| CN113670682A (en) * | 2021-07-22 | 2021-11-19 | 包头钢铁（集团）有限责任公司 | Preparation method and test method of 50kg/m steel rail fracture toughness sample |
| CN113909294A (en) * | 2021-10-28 | 2022-01-11 | 攀钢集团攀枝花钢铁研究院有限公司 | High-density turnout steel rail and production method thereof |
| CN114507806A (en) * | 2022-01-10 | 2022-05-17 | 包头钢铁（集团）有限责任公司 | Low-cost low-temperature-resistant steel rail production process |
-
2007
- 2007-11-14 CN CNA2007102025304A patent/CN101148736A/en active Pending
Cited By (20)
| 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 |
| CN102643971A (en) * | 2012-04-12 | 2012-08-22 | 东北大学 | Online thermal treatment device for heavy rail |
| CN103131826A (en) * | 2013-02-26 | 2013-06-05 | 内蒙古包钢钢联股份有限公司 | Steel rail on-line wind-jet quenching heat treatment simulation experiment device |
| CN104561496A (en) * | 2014-12-25 | 2015-04-29 | 内蒙古科技大学 | Spray cooling experiment device for thermal treatment of steel rail |
| CN107081336A (en) * | 2017-05-27 | 2017-08-22 | 陈金昌 | The controllable rolling of railway switch tongue Warm status and immediate quenching technique |
| CN107227429A (en) * | 2017-06-19 | 2017-10-03 | 武汉钢铁有限公司 | A kind of production method of the rail containing B |
| JP7018138B2 (en) | 2017-12-12 | 2022-02-09 | ポスコ | Heat treatment curable high carbon steel sheet and its manufacturing method |
| JP2021505772A (en) * | 2017-12-12 | 2021-02-18 | ポスコＰｏｓｃｏ | Heat treatment curable high carbon steel sheet and its manufacturing method |
| CN109234611A (en) * | 2018-08-16 | 2019-01-18 | 包头钢铁（集团）有限责任公司 | The milling method of rail, the smelting process of rail and rail |
| WO2020057538A1 (en) * | 2018-09-19 | 2020-03-26 | 武汉钢铁有限公司 | Steel rail inline heat treatment flatness control method |
| CN109402520B (en) * | 2018-11-02 | 2020-11-24 | 包头钢铁（集团）有限责任公司 | Rare earth-containing low-temperature-resistant wear-resistant heat-treated steel rail and preparation method thereof |
| CN109402520A (en) * | 2018-11-02 | 2019-03-01 | 包头钢铁（集团）有限责任公司 | One kind is containing low temperature resistant wear-resisting heat-treated rail of rare earth and preparation method thereof |
| CN109825686A (en) * | 2019-03-19 | 2019-05-31 | 上海交通大学 | A quenching and cooling device for evenly spraying water along the rail head profile on the rail line |
| CN110358904A (en) * | 2019-05-30 | 2019-10-22 | 邯郸钢铁集团有限责任公司 | The control method of rail shape after rail burning optimization on line |
| CN110358904B (en) * | 2019-05-30 | 2020-11-03 | 邯郸钢铁集团有限责任公司 | Method for controlling rail shape after on-line heat treatment of steel rail |
| CN113403465A (en) * | 2021-05-18 | 2021-09-17 | 邯郸钢铁集团有限责任公司 | Method for controlling uniformity of structure performance of two sides of heat-treated steel rail head |
| CN113403465B (en) * | 2021-05-18 | 2022-05-20 | 邯郸钢铁集团有限责任公司 | Method for controlling uniformity of structure performance of two sides of heat-treated steel rail head |
| CN113670682A (en) * | 2021-07-22 | 2021-11-19 | 包头钢铁（集团）有限责任公司 | Preparation method and test method of 50kg/m steel rail fracture toughness sample |
| CN113909294A (en) * | 2021-10-28 | 2022-01-11 | 攀钢集团攀枝花钢铁研究院有限公司 | High-density turnout steel rail and production method thereof |
| CN114507806A (en) * | 2022-01-10 | 2022-05-17 | 包头钢铁（集团）有限责任公司 | Low-cost low-temperature-resistant steel rail production process |
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