CN109207691A - The production method of heavy haul railway rail - Google Patents
The production method of heavy haul railway rail Download PDFInfo
- Publication number
- CN109207691A CN109207691A CN201811280755.6A CN201811280755A CN109207691A CN 109207691 A CN109207691 A CN 109207691A CN 201811280755 A CN201811280755 A CN 201811280755A CN 109207691 A CN109207691 A CN 109207691A
- Authority
- CN
- China
- Prior art keywords
- rail
- heat
- production method
- heavy haul
- haul railway
- 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.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/78—Combined heat-treatments not provided for above
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/04—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rails
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Abstract
The present invention relates to rail preparation method fields, especially a kind of reduction autstenitic grain size, refine pearlite piece interlamellar spacing, while improving rail strength, the production method for continuing to improve the heavy haul railway rail of the toughness of rail recycles heating device that rail is heated between 650-700 DEG C again after rolling waste heat to rail progress first time heat treatment, then rail is back to Heat treating machine set again and carries out secondary heat treatment, then quickly exit Heat treating machine set again.After the present invention is heat-treated due to first time, piece interlamellar spacing has been refined, and after being heat-treated using second, can further be refined pearlite piece interlamellar spacing, be improved rail strength and toughness.1380MPa or more, -20 DEG C of low temperature fracture toughness >=38MPam are reached using the rail tensile strength that this method produces1/2, wear-resisting property is more excellent, and contacting fatigue resistance is excellent.Present invention is particularly suitable among the production of heavy haul railway rail.
Description
Technical field
The present invention relates to rail preparation method field, especially a kind of production method of heavy haul railway rail.
Background technique
With the development of domestic and international railway cause, railway is gradually to high speed or overload direction development, for heavy-duty steel rail
Speech, needs rail strength higher, to adapt to increasingly increased railway transportation demand, while also needing to be equipped with higher toughness, to support
The shock loading of anti-rail.Existing rail is mainly based on pearlite steel rail, but pearlite steel rail ultimate tensile is 1350MPa,
Existing pearlite system and heat treatment process are difficult to reach 1350MPa or more.
Burning optimization on line rail is carried out to rail using rolling waste heat and has become the mainstream of world's Rail Production, but due to by
It is limited to roll the limitation of waste heat autstenitic grain size, heat treatment intensity of cooling can not be improved.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of reduction autstenitic grain sizes, refine pearlite piece interlayer
Away from, improve rail strength while, continue improve rail toughness heavy haul railway rail production method.
The technical solution adopted by the present invention to solve the technical problems is: the production method of heavy haul railway rail, utilizes
After waste heat is rolled to rail progress first time heat treatment, recycle heating device that rail is heated between 650-700 DEG C again,
Then rail is back to Heat treating machine set again and carries out secondary heat treatment, then quickly exit Heat treating machine set again.
Further, the heating device is induction heating apparatus.
Further, when being handled when using rolling waste heat, temperature range locating for rail be 650-900 DEG C it
Between.
Further, being heat-treated for the first time are as follows: the heating for applying 1-5 DEG C/s to rail is cooling, rail temperature after cooling
It is down to 400-550 DEG C, and quickly exits Heat treating machine set, stops primary heat treatment.
Further, being applied by heating device to the rail for exiting Heat treating machine set after completing to be heat-treated for the first time
Add induction heating, rail is heated to 650-700 DEG C, then rapidly enters Heat treating machine set again.
Further, the rail for being fed again into Heat treating machine set by the rail after induction heating is applied 2-50 DEG C/s
Acceleration it is cooling, it is cooling after rail temperature when being down to 400-550 DEG C, rail quickly exits Heat treating machine set, stops second of heat
Handle unit.
Further, the rail enters furnace molten iron using low S, takes high alkalinity refining slag when casting early period, and
The method of whole process protection casting is cast.
Further, the rail, when casting early period, carburant uses the alloy of anthracite and low N.
Further, the rail when casting early period, foaming agent is used in LF heating process, prevents from connecing with air
Touching, sucks excessive N.
Further, the rail is when casting early period, the slab after casting enters burial pit slow cooling.
The beneficial effects of the present invention are: the present invention in practical operation, after being heat-treated by first time, utilizes at heat again
Waste heat is managed, then secondary heat treatment again after on-line heating, has just refined autstenitic grain size.It, can in second of heat treatment process
Greatly improve intensity of cooling.Simultaneously as piece interlamellar spacing has refined after being heat-treated for the first time, it, can after being heat-treated using second
Pearlite piece interlamellar spacing is further refined, rail strength and toughness are improved.Reached using the rail tensile strength that this method produces
1380MPa or more, -20 DEG C of low temperature fracture toughness >=38MPam1/2, wear-resisting property is more excellent, and contacting fatigue resistance is excellent.This
Invention is particularly suitable among the production of heavy haul railway rail.
Specific embodiment
The production method of heavy haul railway rail after carrying out first time heat treatment to rail using rolling waste heat, recycles
Rail is heated between 650-700 DEG C by heating device again, and rail is then back to Heat treating machine set again and carries out second heat
Processing, then quickly exits Heat treating machine set again.
Existing rail is mainly based on pearlite steel rail, but pearlite steel rail ultimate tensile is 1350MPa, existing pearlite
System and heat treatment process are difficult to reach 1350MPa or more.Currently, carrying out burning optimization on line to rail using rolling waste heat
Rail has become the mainstream of world's Rail Production, but the limitation due to being limited to rolling waste heat autstenitic grain size, can not improve
It is heat-treated intensity of cooling.In view of the drawbacks of the prior art, initiative devises heat-treating methods twice to the present invention, is using
After second is heat-treated, intensity of cooling can be greatly improved, can also further refine pearlite piece interlamellar spacing, improves rail strength
And toughness.In practical operation, the heating device is preferably induction heating apparatus, and efficiency and the heating to guarantee heating are accurate
Degree.
In order to guarantee accuracy when being heat-treated for the first time, when being handled when using rolling waste heat, locating for rail
Temperature range is between 650-900 DEG C.Concretely, for first time is heat-treated, processing method are as follows: 1- is applied to rail
The heating of 5 DEG C/s is cooling, and rail temperature is down to 400-550 DEG C after cooling, and quickly exits Heat treating machine set, stops primary heat
Processing.After completing to be heat-treated for the first time, induction heating is applied to the rail for exiting Heat treating machine set by heating device, preferably
Rail is heated to 650-700 DEG C, then rapidly enters Heat treating machine set again.It will be sent again by the rail after induction heating
When entering the rail of Heat treating machine set and being handled, the acceleration for preferably applying 2-50 DEG C/s is cooling, it is cooling after rail temperature be down to
At 400-550 DEG C, rail quickly exits Heat treating machine set, stops second of Heat treating machine set.
For the casting of rail, the present invention also just following technological improvement, to further increase product overall quality.
Wherein, the preferably described rail enters furnace molten iron using low S, takes high alkalinity refining slag, and whole process protection pours when casting early period
The method of note is cast；It is preferred that the rail, when casting early period, carburant uses the alloy of anthracite and low N；It is preferred that institute
Rail is stated in casting early period, foaming agent is used in LF heating process, prevents from contacting with air, sucks excessive N；The steel
For rail when casting early period, the slab after casting enters burial pit slow cooling.
Embodiment
The embodiment of the present invention and corresponding comparative example select following rail chemical component.
1 embodiment rail chemical component of table/%
Comparative example in the present invention uses chemical component identical with embodiment, heating, rolling mill practice.
Secondary heat treatment is carried out to rail using the method in claim, wherein 1# to 5# is the cooling speed of different heat treatment
Degree and different heating temperature, 6# and 7# are comparative example, and 6# is only with primary heat treatment, and 7# is rolled.
2 embodiment of table and comparative example rail secondary heat treatment technique
3 embodiment and comparative example rail autstenitic grain size of table and piece interlamellar spacing
According to TB/T 2344-2012 requirement, tensile sample inspection is carried out to 6 rail samples respectively and -20 DEG C of low temperature are disconnected
Toughness inspection is split, inspection result is as shown in table 4.
4 embodiment of table and comparative example rail toughness and tenacity
The rail that the present invention has chosen identical chemical component simultaneously compares, in embodiment, at used five kinds
Reason mode is the method in the present invention.The comparing result of table 1 to table 3 shows by carrying out secondary heat treatment, rail to rail
Intensity is further high, and toughness also further increases.
In conclusion the production method of abrasion-resistant heavy-load Rail for railway provides a kind of reduction austenite grain in the present invention
The production method of size and piece interlamellar spacing, and then the effective ways of the obdurability of rail are improved, product is suitable for heavy duty both at home and abroad
Route.
Claims (10)
1. the production method of heavy haul railway rail, it is characterised in that: carry out first time heat treatment to rail using rolling waste heat
Afterwards, recycle heating device rail is heated between 650-700 DEG C again, then again by rail be back to Heat treating machine set into
Row secondary heat treatment, then quickly exits Heat treating machine set again.
2. the production method of heavy haul railway rail as described in claim 1, it is characterised in that: the heating device is induction
Heating device.
3. the production method of heavy haul railway rail as claimed in claim 1 or 2, it is characterised in that: when using rolling waste heat
When being handled, temperature range locating for rail is between 650-900 DEG C.
4. the production method of heavy haul railway rail as claimed in claim 3, which is characterized in that be heat-treated for the first time are as follows: right
The heating that rail applies 1-5 DEG C/s is cooling, and rail temperature is down to 400-550 DEG C after cooling, and quickly exits Heat treating machine set, stops
Only primary heat treatment.
5. the production method of heavy haul railway rail as claimed in claim 4, it is characterised in that: complete to be heat-treated for the first time
Afterwards, induction heating is applied to the rail for exiting Heat treating machine set by heating device, rail is heated to 650-700 DEG C, then
Heat treating machine set is rapidly entered again.
6. the production method of heavy haul railway rail as claimed in claim 5, it is characterised in that: will be by after induction heating
The acceleration that the rail that rail is fed again into Heat treating machine set applies 2-50 DEG C/s is cooling, and rail temperature is down to 400-550 after cooling
DEG C when, rail quickly exits Heat treating machine set, stops second of Heat treating machine set.
7. the production method of heavy haul railway rail as claimed in claim 1 or 2, it is characterised in that: the rail is in early period
When casting, furnace molten iron is entered using low S, takes high alkalinity refining slag, and the method for whole process protection casting is cast.
8. the production method of heavy haul railway rail as claimed in claim 1 or 2, it is characterised in that: the rail is in early period
When casting, carburant uses the alloy of anthracite and low N.
9. the production method of heavy haul railway rail as claimed in claim 1 or 2, it is characterised in that: the rail is in early period
When casting, foaming agent is used in LF heating process, prevents from contacting with air, sucks excessive N.
10. the production method of heavy haul railway rail as claimed in claim 1 or 2, it is characterised in that: the rail is in early period
When casting, the slab after casting enters burial pit slow cooling.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811280755.6A CN109207691A (en) | 2018-10-30 | 2018-10-30 | The production method of heavy haul railway rail |
| AU2019232893A AU2019232893B2 (en) | 2018-10-30 | 2019-09-20 | Manufacturing method of rails for heavy-haul railways |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811280755.6A CN109207691A (en) | 2018-10-30 | 2018-10-30 | The production method of heavy haul railway rail |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109207691A true CN109207691A (en) | 2019-01-15 |
Family
ID=64998159
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811280755.6A Pending CN109207691A (en) | 2018-10-30 | 2018-10-30 | The production method of heavy haul railway rail |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109207691A (en) |
| AU (1) | AU2019232893B2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005171327A (en) * | 2003-12-11 | 2005-06-30 | Nippon Steel Corp | Method for manufacturing pearlite-based rail having excellent surface damage-resistance and internal fatigue damage-resistance, and rail |
| CN103160736A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | High strength bainitic steel rail and heat treatment process thereof |
| 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 |
| CN105051220A (en) * | 2013-03-27 | 2015-11-11 | 杰富意钢铁株式会社 | Pearlite rail and method for manufacturing pearlite rail |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3971655A (en) * | 1974-08-21 | 1976-07-27 | Nippon Steel Corporation | Method for treatment of molten steel in a ladle |
| DE3446794C1 (en) * | 1984-12-21 | 1986-01-02 | BWG Butzbacher Weichenbau GmbH, 6308 Butzbach | Process for the heat treatment of pearlitic rail steel |
| JPH04202626A (en) * | 1990-11-30 | 1992-07-23 | Nippon Steel Corp | Production of steel rail excellent in drop weight resisting characteristic |
| CN100482812C (en) * | 2006-09-12 | 2009-04-29 | 攀枝花钢铁(集团)公司 | Rail heat processing method and rail heat processing unit |
| CN102080185A (en) * | 2010-12-21 | 2011-06-01 | 南阳汉冶特钢有限公司 | High-tensile quenched and tempered steel plate for large-thickness structures and production method thereof |
| CN102230050A (en) * | 2011-06-02 | 2011-11-02 | 内蒙古包钢钢联股份有限公司 | Method for controlling nitrogen content in 350 km/h and above heavy-rail steel |
| CN105063267B (en) * | 2015-08-24 | 2017-11-24 | 武汉钢铁有限公司 | The production method of high-strength alloy R320Cr rail |
-
2018
- 2018-10-30 CN CN201811280755.6A patent/CN109207691A/en active Pending
-
2019
- 2019-09-20 AU AU2019232893A patent/AU2019232893B2/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005171327A (en) * | 2003-12-11 | 2005-06-30 | Nippon Steel Corp | Method for manufacturing pearlite-based rail having excellent surface damage-resistance and internal fatigue damage-resistance, and rail |
| CN103160736A (en) * | 2011-12-14 | 2013-06-19 | 鞍钢股份有限公司 | High strength bainitic steel rail and heat treatment process thereof |
| CN105051220A (en) * | 2013-03-27 | 2015-11-11 | 杰富意钢铁株式会社 | Pearlite rail and method for manufacturing pearlite 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2019232893A1 (en) | 2020-05-14 |
| AU2019232893B2 (en) | 2021-07-22 |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190115 |
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| RJ01 | Rejection of invention patent application after publication |