CN104018082A - Medium-carbon low-alloy wheel steel for metro and manufacturing method of wheel steel - Google Patents
Medium-carbon low-alloy wheel steel for metro and manufacturing method of wheel steel Download PDFInfo
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- CN104018082A CN104018082A CN201410247587.6A CN201410247587A CN104018082A CN 104018082 A CN104018082 A CN 104018082A CN 201410247587 A CN201410247587 A CN 201410247587A CN 104018082 A CN104018082 A CN 104018082A
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Abstract
The invention relates to medium-carbon low-alloy wheel steel for metro and a manufacturing method of the wheel steel. The medium-carbon low-alloy wheel steel is composed of the following chemical components in percentage by weight: 0.50-0.60% of C, 0.80-1.20% of Si, 0.90-1.10% of Mn, 0.15-0.35% of Cr, 0.010-0.030% of Als, less than or equal to 0.015% of P, less than or equal to 0.015% of S and the balance of Fe and inevitable impurity elements. The manufacturing method comprises an electric furnace smelting step, an ingot slicing and rolling step and a thermal treatment step. A wheel manufactured by use of the wheel steel is obviously improved in strength and hardness while the tenacity of the rim of the wheel basically keeps unchanged; the wear-resisting property of the wheel is effectively improved, and the probability of stripping and abrasion of the wheel in the use process is reduced. Meanwhile, the wheel manufactured by use of the wheel steel is capable of keeping the ferrite-pearlite structure state of the previous wheel without increasing the wheel manufacturing difficult.
Description
Technical field
The present invention relates to metallurgical industry production field, be specifically related to a kind of middle carbon and low-alloy subway Wheel Steel and manufacture method thereof, relate in particular to high rigidity and require wheel and preparation method thereof for subway.
Background technology
Along with the continuous acceleration of Urbanization in China, subway is rapidly developed in each big city, the whole nation as the vehicles convenient, environmental protection.But the raising along with passenger capacity and travelling speed, for subway, common ER8, ER9 wheel are in use because strong hardness is on the low side, there is shelled tread, wear away the problems such as serious, this not only can increase car inspection and repair frequency and maintenance cost, affect ride quality, very person has influence on travel safety simultaneously.Visible, improve the use properties of wheel for subway, should not reduce its toughness index to guarantee on the basis of wheel safety in utilization, improve wheel strong hardness index, improve wheel use properties.Traditional method adopts increases C constituent content raising wheel strong hardness index, but can bring infringement to wheel plasticity, toughness, unfavorable to wheel safety in utilization.
When improving wheel strong hardness index, must guarantee its plasticity, toughness index, first to from Composition Design, be improved, in later stage heat treatment process, mate corresponding technique and guarantee that wheel obtains good obdurability matching relationship, improves the Integrated using performances such as the wear resistance of wheel, anti-contact fatigue, security with this simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of middle carbon and low-alloy subway Wheel Steel and manufacture method thereof, in Wheel Steel, C element is formulated with reference to ER8, ER9 wheel in EN13236 standard, pass through microalloying, do not affecting on wheel toughness basis, significantly improve wheel strength, hardness performance, obtain better over-all properties, thereby effectively strengthened wear resisting property and the contacting fatigue resistance of wheel, improved the safety in utilization of wheel.Concrete technical scheme is as follows:
A middle carbon and low-alloy subway Wheel Steel, its chemical component weight per-cent is: C0.50-0.60%, Si0.80-1.20%, Mn0.90-1.10%, Cr0.15-0.35%, Als0.010-0.030%, P≤0.015%, S≤0.015%, all the other are Fe and inevitable impurity element.
Further, its chemical component weight per-cent is: C0.57%, Si1.10%, Mn1.00%, Cr0.25%, Als0.023%, P0.01%, S0.01%, all the other are Fe and inevitable impurity element.
Further, its chemical component weight per-cent is: C0.52%, Si0.88%, Mn0.91%, Cr0.18%, Als0.013%, P0.01%, S0.012%, all the other are Fe and inevitable impurity element.
Above-mentioned middle carbon and low-alloy subway comprises the steps: electrosmelting operation by the manufacture method of Wheel Steel--cutting ingot rolling process--heat treatment step.
Further, electrosmelting operation and cut and also comprise the steps: LF stove refining procedure--RH vacuum-treat operation--round billet continuous casting operation between ingot rolling process.
Further, after heat treatment step, also comprise the steps: processing--finished product detection operation.
Further, described heat treatment step comprises:
Be heated to 840-860 ℃ of insulation 2.0-2.5 hour;
Wheel rim water spray is cooling;
At 500-520 ℃ of temper 4.0-5.0 hour.
Further, wheel rim is sprayed water when cooling and is cooled to below 550 ℃.
Compare with currently available technology, under the prerequisite that wheel prepared by the present invention remains unchanged substantially in rim toughness, strong hardness significantly increases, and has effectively improved the wear resisting property of wheel, reduces wheel and in use peels off, wears away odds.Meanwhile, the wheel that the present invention makes can keep the ferrite-pearlite structural state of original wheel, does not increase difficulty prepared by wheel.
Accompanying drawing explanation
Fig. 1 (a) is that embodiment 1 wheel rim metallographic structure is perlite+a small amount of ferrite;
Fig. 1 (b) is that embodiment 2 wheel rim metallographic structures are perlite+a small amount of ferrite;
Fig. 2 (a) is ER8 wheel hardness;
Fig. 2 (b) is the wheel hardness of embodiment 1;
Fig. 2 (c) is the wheel hardness of embodiment 2;
Fig. 3 is that (compared with ER8, ER9 wheel, in embodiment, wheel yield strength, close to elasticity Anding District, can reduce contact stress and the viscous deformation of tread surface regional metal to the stable figure of different yield strength wheels, slows down that wheel tread is peeled off, the appearance of crackle.)
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 middle wheel alloys method of design for carbon and low-alloy subway, its chemical component weight per-cent is: C0.50-0.60%, Si0.80-1.20%, Mn0.90-1.10%, Cr0.15-0.35%, Als0.010-0.030%, P≤0.015%, S≤0.015%, all the other are Fe and inevitable impurity element.The preparation method of middle carbon and low-alloy subway with wheel is also provided, comprise electrosmelting operation, cut ingot rolling process, heat treatment step, further: described heat treatment step is: be heated to 840-860 ℃ of insulation 2.0-2.5 hour, wheel rim water spray cooling (below being cooled to 550 ℃), then at 500-520 ℃ of temper 4.5-5.0 hour.
Illustrate the content of technical solution of the present invention below:
So far, subway is mainly ER8 in EN13262 standard, ER9 material with wheel both at home and abroad, and it is organized as ferrite-pearlite, and wheel rim toughness explicitly calls for simultaneously, to guarantee wheel safety in utilization.Therefore, wheel-use steel material of the present invention should guarantee that wheel is ferrite-pearlite structural state, and rim toughness index is not less than ER8, ER9 material.
ER8 in EN13262 standard, ER9 material wheel C upper content limit are respectively 0.56wt%, 0.60wt%, consider that the raising of C content can reduce toughness index, the present invention controls and requires at 0.50-0.60wt% wheel C, can guarantee not damage toughness index in ferrite+pearlitic structure.
The rule that affects from alloying element on performance, adopts microalloying for obtaining high intensity hardness performance.Therefore, emphasis of the present invention designs the Si in Wheel Steel, Mn, Cr, Als content.
Carry high Si content and make wheel be heated, be difficult for when cooling austenite phase transformation, martensitic transformation occur, contribute to improve wheel material heat resistanceheat resistant damage performance, but too high Si can increase heat sensitivity and the fragility of material.Therefore the present invention is defined as the scope of Si between 0.80-1.20wt%.
Mn is strengthening element important in the present invention, can effectively improve wheel strength hardness performance, thereby improve the wear resisting property of wheel, but too high Mn there is detrimentally affect to the comprehensive mechanical performance of wheel and processing characteristics, therefore Mn content is controlled between 0.90-1.10wt%.
Cr is less important solution strengthening element, can effectively improve workpiece strong hardness performance, thereby improve the wear resisting property of workpiece, but the rule that affects from Cr element on complete pearlite critical cooling rate, for making ferrite-pearlite tissue be easy to obtain, Cr content should be controlled at 0.15-0.35wt%.
Als can be by crystal grain thinning so that wheel obtains good plasticity and toughness, therefore Als content is controlled between 0.010-0.030wt%.
P and S are impurity elements, therefore its content should be controlled at, are no more than 0.015wt%.
In order to realize the goal of the invention identical with technique scheme, another problem to be solved by this invention has been to provide the method that adopts above-mentioned Wheel Steel to prepare wheel, comprise 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, further: described heat treatment step is: be heated to 840-860 ℃ of insulation 2.0-2.5 hour, wheel rim water spray cooling (below being cooled to 550 ℃), then at 500-520 ℃ of temper 4.0-5.0 hour.
1-3 and embodiment 1-2 are described in detail the present invention by reference to the accompanying drawings.
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, and after cutting ingot, heating rolling, thermal treatment, precision work, forming diameter is the subway wheel of 860mm.
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 form.Described heat treatment step is: be heated to 845 ℃ of insulations 2 hours, wheel rim water spray cooling (be cooled to 550 ℃ following), then 510 ℃ of temper 5 hours.
As shown in Figure 1, the wheel rim metallographic structure that prepared by the present embodiment is nodular troostite+a small amount of ferrite.The present embodiment wheel rim mechanical property is as shown in table 2 and Fig. 2, and rim toughness remains unchanged substantially compared with ER8, ER9 wheel, and intensity and hardness obviously improve compared with ER8, ER9 wheel.
Meanwhile, vehicle system dynamics model trial shows, with the raising (550N/mm of wheel material yield strength
2to 700N/mm
2in scope), the trend that move the oriented elasticity of wheel Anding District, thus change Wheel Rail Contact state, reduce contact stress and the viscous deformation of tread surface regional metal, slow down that wheel tread is peeled off, the appearance of crackle.
Example 1 material wheel, ER8 wheel, ER9 wheel are processed into wear test sample, and carry out wear test with rail sample respectively.Test parameter is respectively: rail sample rotating speed 200rpm, and wheel sample rotating speed 180rpm, rotates slip 10%; It is 1000N/mm that stress is touched in test
2, test period is 20h, rail sample cycle number of times is 2.4 * 10
5.Example 1 wheel wear face quality is better than ER8, ER9 wheel.
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 form.Described heat treatment step is: be heated to 850 ℃ of insulations 2.5 hours, and wheel rim water spray cooling (be cooled to 550 ℃ following), then 515 ℃ of temper 4.5 hours.
As shown in Figure 1, the wheel rim metallographic structure that prepared by the present embodiment is nodular troostite+a small amount of ferrite.The present embodiment wheel mechanical property is as shown in table 2 and Fig. 2, and rim toughness remains unchanged substantially compared with ER8, ER9 wheel, and intensity and hardness obviously improve compared with ER8, ER9 wheel.
Meanwhile, vehicle system dynamics model trial shows, with the raising (550N/mm of wheel material yield strength
2to 700N/mm
2in scope), the trend that move the oriented elasticity of wheel Anding District, thus change Wheel Rail Contact state, reduce contact stress and the viscous deformation of tread surface regional metal, slow down that wheel tread is peeled off, the appearance of crackle.
Example 2 material wheels, ER8 wheel, ER9 wheel are processed into wear test sample, and carry out wear test with rail sample respectively.Test parameter is respectively: rail sample rotating speed 200rpm, and wheel sample rotating speed 180rpm, rotates slip 10%; It is 1000N/mm that stress is touched in test
2, test period is 20h, rail sample cycle number of times is 2.4 * 10
5.Example 2 wheel wear face quality are better than ER8, ER9 wheel.
Table 1 embodiment 1-2 and the chemical composition (wt%) of ER8, ER9 wheel for subway
| Embodiment | C | Si | Mn | P | S | Cr | Als |
| Embodiment 1 | 0.57 | 1.10 | 1.00 | 0.010 | 0.010 | 0.25 | 0.023 |
| Embodiment 2 | 0.52 | 0.88 | 0.91 | 0.010 | 0.012 | 0.18 | 0.013 |
| ER8 wheel | 0.53 | 0.27 | 0.74 | 0.008 | 0.001 | 0.20 | 0.040 |
| ER9 wheel | 0.56 | 0.27 | 0.72 | 0.007 | 0.002 | 0.24 | 0.035 |
Table 2 embodiment 1-2 and ER8, ER9 wheel rim mechanical property for subway
By reference to the accompanying drawings the present invention is exemplarily described above; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as the various improvement that adopted method design of the present invention and technical scheme to carry out; or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (9)
1. carbon and low-alloy subway Wheel Steel in a kind, it is characterized in that, its chemical component weight per-cent is: C0.50-0.60%, Si0.80-1.20%, Mn0.90-1.10%, Cr0.15-0.35%, Als0.010-0.030%, P≤0.015%, S≤0.015%, all the other are Fe and inevitable impurity element.
2. middle carbon and low-alloy subway Wheel Steel as claimed in claim 1, it is characterized in that, its chemical component weight per-cent is: C0.57%, Si1.10%, Mn1.00%, Cr0.25%, Als0.023%, P0.01%, S0.01%, all the other are Fe and inevitable impurity element.
3. middle carbon and low-alloy subway Wheel Steel as claimed in claim 1, it is characterized in that, its chemical component weight per-cent is: C0.52%, Si0.88%, Mn0.91%, Cr0.18%, Als0.013%, P0.01%, S0.012%, all the other are Fe and inevitable impurity element.
4. the manufacture method of Wheel Steel for the middle carbon and low-alloy subway as described in claim 1-3, is characterized in that,--cutting ingot rolling process--heat treatment step that comprises the steps: electrosmelting operation.
5. the manufacture method of Wheel Steel for middle carbon and low-alloy subway as claimed in claim 4, is characterized in that, electrosmelting operation and cut and also comprise the steps: LF stove refining procedure--RH vacuum-treat operation--round billet continuous casting operation between ingot rolling process.
6. the manufacture method of Wheel Steel for the middle carbon and low-alloy subway as described in claim 4 or 5, is characterized in that, also comprises the steps: processing--finished product detection operation after heat treatment step.
7. the manufacture method of Wheel Steel for the middle carbon and low-alloy subway as described in any one in claim 4-6, is characterized in that, described heat treatment step comprises:
Be heated to 840-860 ℃ of insulation 2.0-2.5 hour;
Wheel rim water spray is cooling;
At 500-520 ℃ of temper 4.0-5.0 hour.
8. the manufacture method of Wheel Steel for middle carbon and low-alloy subway as claimed in claim 7, is characterized in that, wheel rim is sprayed water when cooling and is cooled to below 550 ℃.
9. a subway wheel, is characterized in that, adopts the middle carbon and low-alloy subway Wheel Steel manufacturing as described in claim 1-3.
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| CN201410247587.6A CN104018082B (en) | 2014-06-05 | 2014-06-05 | Carbon and low-alloy subway wheel steel and manufacture method thereof in one |
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| CN201410247587.6A CN104018082B (en) | 2014-06-05 | 2014-06-05 | Carbon and low-alloy subway wheel steel and manufacture method thereof in one |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104325838A (en) * | 2014-10-22 | 2015-02-04 | 雷帮荣 | High-speed rail wheel and hot-extrusion integrated forming method thereof |
| CN104451401A (en) * | 2014-12-18 | 2015-03-25 | 马钢(集团)控股有限公司 | Wheel steel for wheel and preparation method thereof |
| CN106435365A (en) * | 2016-11-15 | 2017-02-22 | 马鞍山钢铁股份有限公司 | High-hardness wear-resistant wheel steel and wheel preparation method |
| CN107586938A (en) * | 2017-09-08 | 2018-01-16 | 马钢(集团)控股有限公司 | A kind of heat treatment method of medium carbon low alloy steel railway wheel |
| CN108342648A (en) * | 2018-03-09 | 2018-07-31 | 马钢(集团)控股有限公司 | A kind of high tenacity heavy duty goods train high-carbon wheel steel and preparation method thereof |
| CN110616374A (en) * | 2019-10-17 | 2019-12-27 | 马鞍山钢铁股份有限公司 | High-carbon wheel steel, heat treatment method thereof and method for preparing wheel by using high-carbon wheel steel |
| CN111560562A (en) * | 2020-05-25 | 2020-08-21 | 宝武集团马钢轨交材料科技有限公司 | Medium carbon steel wheel containing Cr and Mo and heat treatment method thereof |
| CN111961964A (en) * | 2020-07-28 | 2020-11-20 | 马鞍山钢铁股份有限公司 | Medium-carbon aluminum-controlled nitrogen-controlled vanadium-controlled microalloyed high-speed wheel steel and wheel preparation method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104325838A (en) * | 2014-10-22 | 2015-02-04 | 雷帮荣 | High-speed rail wheel and hot-extrusion integrated forming method thereof |
| CN104325838B (en) * | 2014-10-22 | 2016-08-24 | 雷帮荣 | A kind of high ferro wheel and hot extrusion integral forming method thereof |
| CN104451401A (en) * | 2014-12-18 | 2015-03-25 | 马钢(集团)控股有限公司 | Wheel steel for wheel and preparation method thereof |
| CN106435365A (en) * | 2016-11-15 | 2017-02-22 | 马鞍山钢铁股份有限公司 | High-hardness wear-resistant wheel steel and wheel preparation method |
| CN107586938A (en) * | 2017-09-08 | 2018-01-16 | 马钢(集团)控股有限公司 | A kind of heat treatment method of medium carbon low alloy steel railway wheel |
| CN108342648A (en) * | 2018-03-09 | 2018-07-31 | 马钢(集团)控股有限公司 | A kind of high tenacity heavy duty goods train high-carbon wheel steel and preparation method thereof |
| CN110616374A (en) * | 2019-10-17 | 2019-12-27 | 马鞍山钢铁股份有限公司 | High-carbon wheel steel, heat treatment method thereof and method for preparing wheel by using high-carbon wheel steel |
| CN111560562A (en) * | 2020-05-25 | 2020-08-21 | 宝武集团马钢轨交材料科技有限公司 | Medium carbon steel wheel containing Cr and Mo and heat treatment method thereof |
| CN111961964A (en) * | 2020-07-28 | 2020-11-20 | 马鞍山钢铁股份有限公司 | Medium-carbon aluminum-controlled nitrogen-controlled vanadium-controlled microalloyed high-speed wheel steel and wheel preparation method |
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