CN104762552A - Wheel steel and heat treatment method and application thereof - Google Patents
Wheel steel and heat treatment method and application thereof Download PDFInfo
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- CN104762552A CN104762552A CN201510230963.5A CN201510230963A CN104762552A CN 104762552 A CN104762552 A CN 104762552A CN 201510230963 A CN201510230963 A CN 201510230963A CN 104762552 A CN104762552 A CN 104762552A
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Abstract
The invention relates to wheel steel and a heat treatment method and application thereof. The wheel steel comprises, by weight, 0.57-0.67% of C, not larger than 1.00% of Si, not larger than 1.20% of Mn, not larger than 0.025% of P, not larger than 0.025% of S, and the balance Fe and unavoidable impurity elements. The wheel steel is used for manufacturing wagon wheels. The heat treatment method comprises the following steps that firstly, the temperature of the wheels is increased to 850 DEG C to 870 DEG C along with the temperature of a furnace; secondly, heat preservation is conducted; thirdly, spray cooling is conducted on rims; fourthly, when the temperature of the middle portions of wheel disks is reduced to 730 DEG C to 740 DEG C, air cooling is conducted on the wheel disks; fifthly, air cooling is conducted; sixthly, heating, tempering and heat preserving are conducted. On the basis that the strength of the wagon wheels subjected to heat treatment and containing 0.57-0.67% of carbon goes near to that of a common medium and high carbon steel wheels, the impact property of the wheel disks is remarkably improved, and therefore the good comprehensive mechanical property is obtained, and the use safety performance of the wheels is improved.
Description
Technical field
The present invention relates to rail truck rolled steel wheel and manufacture field, be specifically related to the railway wagon heat treating method of rolling over steel solid wheel of axle heavy 25t ~ 30t, travelling speed≤120km/h.
Background technology
The existing railway wagon wheel standards of China is the railroad industry standard TB/T2817-1997 promulgated " steel solid wheel technical qualification rolled over by rail truck " in 1997, is mainly applicable to the railway wagon wheel that travelling speed is not less than 120km/h.In this standard, conventional CL60 steel C content requires that decades do not change for 0.55-0.65%.In the last few years, conventional wheel steel successively exposed a large amount of problems under running on heavy duty, speed-raising condition, comprised wearing and tearing and roll over limit serious, wheel spalling, fell block aggravation, and the life-span of wheel sharply shortens, and causes regular non-normal stop maintenance.For Datong-Qinhuangdao Railway heavy haul transport, the heavy CL60 material wheel military service effect of 25t axle of C80, C76 type heavy-duty freight car equipment is very undesirable, and wheel wear, more than 1.5mm/10 ten thousand kilometers, weighs ordinary vehicle type wheel much larger than 23t axle.
Be about to the new railway industry standard of issuing and implementation, wherein partial content will substitute TB/T2817-1997.Increase newly in new TB and be applicable to 25t-30t axle heavy CL65 (0.57-0.67%C), CL70 (0.67-0.77%C) two materials, intensity, the hardness requirement of wheel improve along with the increase of C content, impact requirement with stylish TB to CL65 disc normal temperature suitable with CL60, namely mean value is not less than 16J.
C content part is in the CL65 steel wheel within the scope of middle, high-carbon, new railway Industry code requirements wheel rim is after Quench and temper process, its microstructure should be nodular troostite and a small amount of ferrite, the distinguishing feature of this tissue is, the raising of strong hardness can cause the decline of impelling strength, thus reduce inside wheel resistance to crack extension ability, when the effect of complicated wheel-rail interaction power can be subject in wheel under arms process, can have a negative impact to usage safety performance.
Ma Gang is in research and development middle, high-carbon CL65 wheel process, according to the CL65 wheel of wheel pair rolling, thermal treatment process trial-production, there is the on the low side and phenomenon of surplus capacity deficiency of disc impelling strength mean value, better disc impelling strength cannot be obtained on the basis meeting given strength, reduce the usage safety performance of middle, high-carbon wheel.
Therefore, how to ensure under the prerequisite that middle, high-carbon (0.57-0.67%C) wheel strength level does not reduce, meeting the requirement being not less than 16J in new TB about disc impact mean value, effectively improve the impelling strength index of wheel, is the major issue being badly in need of solution at present.
Summary of the invention
The object of the present invention is to provide a kind of C content to be the heat treating method of the wagon wheel of 0.57-0.67%, its objective is on the basis ensureing wheel strength, improve disc impelling strength, increase wheel usage safety performance.Concrete technical scheme is as follows:
A kind of Wheel Steel is: C 0.57-0.67%, Si≤1.00%, Mn≤1.20%, P≤0.025%, S≤0.025% that all the other are Fe and inevitable impurity element containing chemical component weight per-cent.
Further, containing chemical component weight per-cent be: C 0.60%, Si 0.84%, Mn 0.80%, P 0.015%, S 0.013%, Als 0.009%.
The purposes of above-mentioned Wheel Steel, for the manufacture of wagon wheel.
The heat treating method of above-mentioned Wheel Steel, comprises the steps:
(1) wheel is warming up to 850 ~ 870 DEG C with stove;
(2) be incubated;
(3) wheel rim water-spraying control;
(4) when disc middle portion temperature is down to 730 ~ 740 DEG C, carry out air-cooled to disc position;
(5) air cooling;
(6) heat, tempering, insulation.
Further, wheel described in step (1) is first through common process rolling.
Further, insulation 2.5-3.0h in step (2).
Further, wheel rim interior metal is made in step (3) with the speed of cooling accelerating cooling of 2 DEG C/s ~ 5 DEG C/s to less than 550 DEG C.
Further, make disc interior metal with below the speed of cooling accelerating cooling to 550 of 4 DEG C/s ~ 7 DEG C/s DEG C in step (4).
Further, be heated to 490 ± 10 DEG C of tempering in step (6), soaking time process is not less than 4 hours.
Wheel normative heat treatment system is generally: roll rear wheel thermal treatment heating, and heat the quenching of laggard road wheel rim, now disc is as air-cooled condition, then carries out solid wheel tempering.Compared with currently available technology, the invention provides the heat treating method that a kind of C content is 0.57-0.67% wagon wheel disc impelling strength, when carrying out wheel rim quenching to the wheel workpiece after conveniently technique rolling, thermal treatment heating, increase air-cooled to disc, to accelerate disc place speed of cooling, promote increase and the refinement of perlite lamella of proeutectoid ferrite amount of precipitation, thus while improving wheel web impelling strength, do not reduce its intensity, make it to reach good obdurability coupling.The carbon content after thermal treatment of the present invention is adopted to be that the wagon wheel of 0.57-0.67% is on the basis making intensity suitable with conventional middle, high-carbon wheel, disc impact property significantly improves, thus obtain good comprehensive mechanical property, thus improve wheel usage safety performance.
Accompanying drawing explanation
The wheel web microstructure (lamellar pearlite+a small amount of ferrite) of Fig. 1 to be conventional carbon content be 0.57-0.67%
Fig. 2 is wheel web microstructure of the present invention (fine pearlite+a small amount of ferrite)
Embodiment
Describe the present invention with reference to the accompanying drawings below, it is a kind of preferred embodiment in numerous embodiments of the present invention.
A kind of heat treating method for high carbon steel wagon wheel, the chemical component weight per-cent of high carbon steel wagon wheel is: C 0.57-0.67%, Si≤1.00%, Mn≤1.20%, P≤0.025%, S≤0.025%, and all the other are Fe and inevitable impurity element.Concrete operation method is: by the wheel after conveniently technique rolling, 850 ~ 870 DEG C of insulations are warming up to after 2.5-3.0 hour with stove, wheel rim water-spraying control (making wheel rim interior metal with the speed of cooling accelerating cooling of 2 DEG C/s ~ 5 DEG C/s to less than 550 DEG C), when disc middle portion temperature is down to 730 ~ 740 DEG C, disc position is carried out air-cooled (making disc interior metal with below the speed of cooling accelerating cooling to 550 of 4 DEG C/s ~ 7 DEG C/s DEG C), then air cooling, finally reheat to 490 ± 10 DEG C of tempering, soaking time process is not less than 4 hours.Make disc organize fine pearlite+a small amount of ferrite, the invention enables disc place lamellar pearlite sheet interlayer spacing to reduce, namely ferrite and cemetite lamellae thinning, plastic deformation ability is increased, thus the plasticity and toughness of raising disc.
The chemical component weight per-cent of the Wheel Steel in embodiment 1-2 is as shown in table 1, embodiment 1-2 all adopts electrosmelting direct continuous casting after LF+RH refining vacuum outgas to become the round base of φ 380mm, forms the wheel that diameter is 840mm after cutting ingot, heating rolling, thermal treatment.
Embodiment 1:
By chemical composition as the molten steel of table 1 embodiment 1 through Electric furnace steel making operation, LF stove refining procedure, RH vacuum-treat operation, round billet continuous casting operation, cut ingot rolling process, heat treatment step, processing, finished product detection operation and being formed.Described heat treatment step is: be warming up to 854 DEG C of insulations after 2.6 hours with stove, wheel rim water-spraying control (making wheel rim interior metal with the speed of cooling accelerating cooling of 2 DEG C/s ~ 5 DEG C/s to less than 550 DEG C), when disc middle portion temperature is down to 790 DEG C, disc position is carried out air-cooled (making disc interior metal with below the speed of cooling accelerating cooling to 732 of 4 DEG C/s ~ 7 DEG C/s DEG C), then air cooling, finally reheat to 497 DEG C of tempering, soaking time 4 hours 30 minutes.
As shown in Figure 1, 2, wheel web microstructure prepared by the present embodiment is fine pearlite+a small amount of ferrite, and the CL65 wheel web microstructure that common process is produced is lamellar pearlite+a small amount of ferrite, namely embodiment pearlite interlaminar spacing significantly reduces, make fine pearlite comparatively lamellar pearlite there are good plasticity and toughness.
The present embodiment wheel web stretch and impact property as shown in table 2, the tensile property of embodiment 1 and comparative example wheel web is substantially suitable as can be seen from Table 2, but the disc of embodiment 1 impacts mean value higher than comparative example 7J, and impelling strength is obviously better than comparative example, and monodrome is stablized, and fluctuates less.
As can be seen here, embodiment 1 wheel web, under the prerequisite keeping intensity suitable for comparative example, has higher impelling strength level, and invention achieves desired result.
Embodiment 2:
By chemical composition as the molten steel of table 1 embodiment 2 through Electric furnace steel making operation, LF stove refining procedure, RH vacuum-treat operation, round billet continuous casting operation, cut ingot rolling process, heat treatment step, processing, finished product detection operation and being formed.Described heat treatment step is: by chemical composition as the molten steel of table 1 embodiment 2 through Electric furnace steel making operation, LF stove refining procedure, RH vacuum-treat operation, round billet continuous casting operation, cut ingot rolling process, heat treatment step, processing, finished product detection operation formed.Described heat treatment step is: be warming up to 868 DEG C of insulations after 2.8 hours with stove, wheel rim water-spraying control (making wheel rim interior metal with the speed of cooling accelerating cooling of 2 DEG C/s ~ 5 DEG C/s to less than 550 DEG C), when disc middle portion temperature is down to 786 DEG C, disc position is carried out air-cooled (making disc interior metal with below the speed of cooling accelerating cooling to 733 of 4 DEG C/s ~ 7 DEG C/s DEG C), then air cooling, finally reheat to 483 DEG C of tempering, soaking time process is not less than 4 hours 45 minutes.
The present embodiment wheel web stretch and impact property as shown in table 2, the tensile property of embodiment 1 and comparative example wheel web is substantially suitable as can be seen from Table 2, but the disc of embodiment 1 impacts mean value higher than comparative example 5J, and impelling strength is obviously better than comparative example, and monodrome is stablized, and fluctuates less.
As can be seen here, embodiment 2 wheel web, under the prerequisite keeping intensity suitable for comparative example, has higher disc impelling strength, and invention achieves desired result.
The alloying constituent (weight percent %) of the wheel that table 1 embodiment 1-2 and conventional middle, high-carbon manufacture
| C | Si | Mn | P | S | Als | |
| Embodiment 1 | 0.60 | 0.84 | 0.80 | 0.015 | 0.013 | 0.009 |
| Embodiment 2 | 0.64 | 0.87 | 0.87 | 0.013 | 0.014 | 0.017 |
| Conventional CL65 steel | 0.62 | 0.83 | 0.81 | 0.010 | 0.010 | 0.03 |
The wheel web that table 2 embodiment 1-2 and conventional middle, high-carbon manufacture stretches and impact property
Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the various improvement that method of the present invention is conceived and technical scheme is carried out; or directly apply to other occasion, all within protection scope of the present invention without improving.
Claims (9)
1. a Wheel Steel, is characterized in that, containing chemical component weight per-cent is: C 0.57-0.67%, Si≤1.00%, Mn≤1.20%, P≤0.025%, S≤0.025%, and all the other are Fe and inevitable impurity element.
2. Wheel Steel as claimed in claim 1, is characterized in that, containing chemical component weight per-cent be: C 0.60%, Si 0.84%, Mn 0.80%, P 0.015%, S 0.013%, Als 0.009%.
3. the purposes of Wheel Steel as claimed in claim 1 or 2, is characterized in that, for the manufacture of wagon wheel.
4. the heat treating method of Wheel Steel as claimed in claim 1 or 2, is characterized in that, comprise the steps:
(1) wheel is warming up to 850 ~ 870 DEG C with stove;
(2) be incubated;
(3) wheel rim water-spraying control;
(4) when disc middle portion temperature is down to 730 ~ 740 DEG C, carry out air-cooled to disc position;
(5) air cooling;
(6) heat, tempering, insulation.
5. the heat treating method containing carbon Wheel Steel in vanadium as claimed in claim 4, it is characterized in that, described in step (1), wheel is first through common process rolling.
6. the heat treating method containing carbon Wheel Steel in vanadium as described in claim 4 or 5, is characterized in that, insulation 2.5-3.0h in step (2).
7. the heat treating method containing carbon Wheel Steel in vanadium according to any one of claim 4-6, is characterized in that, makes wheel rim interior metal with the speed of cooling accelerating cooling of 2 DEG C/s ~ 5 DEG C/s to less than 550 DEG C in step (3).
8. the heat treating method containing carbon Wheel Steel in vanadium according to any one of claim 4-7, is characterized in that, makes disc interior metal with below the speed of cooling accelerating cooling to 550 of 4 DEG C/s ~ 7 DEG C/s DEG C in step (4).
9. the heat treating method containing carbon Wheel Steel in vanadium according to any one of claim 4-8, it is characterized in that, be heated to 490 ± 10 DEG C of tempering in step (6), soaking time process is not less than 4 hours.
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| CN201510230963.5A CN104762552A (en) | 2015-05-07 | 2015-05-07 | Wheel steel and heat treatment method and application thereof |
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| CN201510230963.5A CN104762552A (en) | 2015-05-07 | 2015-05-07 | Wheel steel and heat treatment method and application thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111996444A (en) * | 2020-07-28 | 2020-11-27 | 马鞍山钢铁股份有限公司 | Medium-carbon and medium-silicon niobium microalloyed high-speed wheel steel and wheel preparation method |
| CN112251667A (en) * | 2020-09-28 | 2021-01-22 | 宝武集团马钢轨交材料科技有限公司 | Medium carbon wheel steel for urban rail for improving hardness uniformity and reducing abnormal structure depth |
| CN113088667A (en) * | 2021-04-16 | 2021-07-09 | 宝武集团马钢轨交材料科技有限公司 | Heat treatment method for improving residual stress of wheel and wheel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101818236A (en) * | 2010-03-22 | 2010-09-01 | 马鞍山钢铁股份有限公司 | Method for manufacturing high carbon steel wheel |
| CN104004968A (en) * | 2014-05-29 | 2014-08-27 | 马钢(集团)控股有限公司 | Wheel steel and wheel heat treatment method |
| CN104498828A (en) * | 2014-12-18 | 2015-04-08 | 马钢(集团)控股有限公司 | Rolled steel solid wheel for railway wagons and wheel steel and production method thereof |
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2015
- 2015-05-07 CN CN201510230963.5A patent/CN104762552A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101818236A (en) * | 2010-03-22 | 2010-09-01 | 马鞍山钢铁股份有限公司 | Method for manufacturing high carbon steel wheel |
| CN104004968A (en) * | 2014-05-29 | 2014-08-27 | 马钢(集团)控股有限公司 | Wheel steel and wheel heat treatment method |
| CN104498828A (en) * | 2014-12-18 | 2015-04-08 | 马钢(集团)控股有限公司 | Rolled steel solid wheel for railway wagons and wheel steel and production method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111996444A (en) * | 2020-07-28 | 2020-11-27 | 马鞍山钢铁股份有限公司 | Medium-carbon and medium-silicon niobium microalloyed high-speed wheel steel and wheel preparation method |
| CN112251667A (en) * | 2020-09-28 | 2021-01-22 | 宝武集团马钢轨交材料科技有限公司 | Medium carbon wheel steel for urban rail for improving hardness uniformity and reducing abnormal structure depth |
| CN112251667B (en) * | 2020-09-28 | 2022-05-24 | 宝武集团马钢轨交材料科技有限公司 | Medium carbon wheel steel for urban rail for improving hardness uniformity and reducing abnormal structure depth |
| CN113088667A (en) * | 2021-04-16 | 2021-07-09 | 宝武集团马钢轨交材料科技有限公司 | Heat treatment method for improving residual stress of wheel and wheel |
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Application publication date: 20150708 |