CN101818240A - Thermal processing method for medium carbon silicon manganese low alloy steel railway wheel - Google Patents
Thermal processing method for medium carbon silicon manganese low alloy steel railway wheel Download PDFInfo
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- CN101818240A CN101818240A CN 201010132560 CN201010132560A CN101818240A CN 101818240 A CN101818240 A CN 101818240A CN 201010132560 CN201010132560 CN 201010132560 CN 201010132560 A CN201010132560 A CN 201010132560A CN 101818240 A CN101818240 A CN 101818240A
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Abstract
The invention discloses a thermal processing method for a medium carbon silicon manganese low alloy steel railway wheel. The thermal processing method sequentially comprises the steps of: high temperature normalizing, which is carried out at the temperature of between 890 and 910 DEG C after rolling; two-section quenching and heating, which is carried out at the temperatures of between 740 and 760 DEG C and between 890 and 910 DEG C; and water cooling, which is carried out at the temperature of 510+/-10 DEG C after tempering. The technical scheme aims to refine and uniformize the original structure and improve the toughness of the railway wheel; the two-section quenching and heating method is adopted to increase the heating speed of the two phase region at a high furnace gas temperature and limit the austenizing time in a short heating time; the rapid water cooling method after tempering is adopted to eliminate the temper brittleness; and the water cooling after the tempering is adopted to change the stress distribution and improve the fatigue performance. The method has good toughness ratio.
Description
Technical field
The invention belongs to the technical field that metallurgical industry is produced, relate to the manufacturing technology of railway wheel, more particularly, the present invention relates to a kind of heat treating method of middle carbon silicomanganese low alloy steel railway wheel.
Background technology
When railway wheel rolls on rail, interact between wheel and the rail, railway wheel bears vertical power, guiding force, brake block pressure and unrelieved stress etc.
Along with railway constantly raises speed, the especially fast development of high-speed railway, the working conditions of railway wheel further worsens, and improves the railway wheel use properties, particularly improves railway wheel opposing crack propagation performance and all the more seems important.
Fracture toughness property is one of important mechanical property of railway wheel steel, concerns the safety in utilization of railway wheel, and it is very important to improve its fracture toughness property.
With regard to high-speed railway wheel Material Selection, because the operational conditions difference is continued to use high carbon steel in Japanese Tokaido the Shinkansen always, their first-selection during the intensity of raising material; And in West Europe, as usefulness such as France, Germany, Italy be the UIC standard, the EN13262 standard that use in Europe; And Indian Standard IRSR-19/93 etc., when requiring to have higher-strength, the wheel rim fracture toughness property there has been clearly regulation, the fracture toughness property mean value that all requires to obtain according to test print quantity must be more than or equal to 80MPa.m1/2, single value can be less than this mean value, but must be more than or equal to 70MPa.m1/2.
In the buying technical specifications of " Harmony " CRH5 EMUs wheel that China now moves the wheel rim fracture toughness property has been made same requirement, still, the TB/T2708-1996H and the TB/T2817-1997 of the existing use of China all do not require fracture toughness property.
Fracture toughness property KIC is the tolerance that material is stoped macrocrack unstable propagation ability, and it has nothing to do with size of crackle own and shape, and is also irrelevant with the external stress size, and relevant with composition, thermal treatment and the complete processing of material.
For improving railway wheel use properties meeting the market requirement, on the basis of proof strength, improve toughness with reference to the Europe superscript wheel, carry out the composition adjustment of carbon drop, increase Si and Mn content, obtain certain achievement, more than 10 ten thousand of Ma Gangyi accumulative total exploitation outlet Europe superscript wheels, ER7, ER8 and ER9 kind all have, and wherein the exploitation amount since 2007 just reaches about 100,000, all have intensity and toughness preferably, but have fracture toughness property value problem on the low side always.
Summary of the invention
Problem to be solved by this invention provides a kind of heat treating method of middle carbon silicomanganese low alloy steel railway wheel, its objective is the fracture toughness property of carbon silicomanganese low alloy steel railway wheel in the raising.
To achieve these goals, the technical scheme taked of the present invention is:
The heat treating method of carbon silicomanganese low alloy steel railway wheel in provided by the present invention, described heat treating method comprise water-cooled operation after 890 ℃～910 ℃ high temperature normalizing operation after rolling, 740 ℃～760 ℃+890 ℃～910 ℃ two-part quenching heating processes, 510 ℃ ± 10 ℃ the tempering.
The concrete technical scheme of described heat treating method is:
Railway wheel after will be according to common process rolling is warming up to 890 ℃～910 ℃ with stove, come out of the stove air cooling to room temperature behind the insulation 120min, again railway wheel is warming up to 740 ℃～760 ℃ with stove, behind insulation 60min ± 5min, quickly heat up to 890 ℃～910 ℃, behind the insulation 30min, water spray cooling 300s comes out of the stove, put into 510 ℃ ± 10 ℃ stoves then, behind the insulation 4h, the immersion cooling; The immersion refrigerative time is 15min～20min.
Press mass percent, the composition of described railway wheel is:
C：0.50％；Si：1.05％；Mn：1.00％；P：0.008％；S：0.006％；Cr：0.016％；Ni：0.006％；Cu：0.007％。
The present invention adopts technique scheme, the carbon silicomanganese low alloy steel railway wheel increases the high temperature normalizing treatment process in the back to rolling, be intended to refinement and homogenizing original structure, to promote to handle eventually fragility element homogenizing such as P, N in refinement, homogenizing and the promotion steel of organizing the back, improve railway wheel toughness; Adopt two-part quenching type of heating, first section heating is controlled at the point near Ac1 to the railway wheel temperature, create conditions for improving wheel rim two-phase region rate of heating, second section is adopted high temperature, heating in short-term, improve the two-phase region rate of heating with high furnace gas temperature, to limit austenitizing time short heat-up time; The method of quick water-cooled can be eliminated temper brittleness after the employing tempering, and water-cooled also can change stress distribution after the tempering simultaneously, improves fatigue property.The railway wheel that the employing aforesaid method is heat-treated also has the better strength and toughness proportioning except having higher fracture toughness property.Increase pretreatment technology, under identical conventional heating condition, KQ is improved
About; Rapid heating quenching technology wheel rim fracture toughness property is higher than conventional quenching technology, and the KQ increment all reaches
About.
Description of drawings
Below the expressed content of each width of cloth accompanying drawing of this specification sheets is made brief description:
Fig. 1 is the conventional heating of two sections rapid heating of the present invention and prior art, the temperature variation comparison diagram at railway wheel tread 35mm place;
Fig. 2 is the conventional railway wheel wheel rim microstructure metallograph of prior art;
Fig. 3 is the conventional railway wheel disc microstructure metallograph of prior art;
Fig. 4 is a railway wheel wheel rim microstructure metallograph of the present invention;
Fig. 5 is a railway wheel disc microstructure metallograph of the present invention.
Embodiment
Contrast accompanying drawing below,,, be described in further detail, inventive concept of the present invention, technical scheme are had more complete, accurate and deep understanding to help those skilled in the art to the specific embodiment of the present invention by description to embodiment.
Because fracture toughness property is very responsive to the thermal treatment of metallic substance, by invent a kind of pointed heat treating method can effectively improve in the fracture toughness property of carbon silicomanganese low alloy steel railway wheel.
The heat treating method of carbon silicomanganese low alloy steel railway wheel in provided by the present invention, described heat treating method comprise water-cooled operation after 890 ℃～910 ℃ high temperature normalizing operation after rolling, 740 ℃～760 ℃+890 ℃～910 ℃ two-part quenching heating processes, 510 ℃ ± 10 ℃ the tempering.
The carbon silicomanganese low alloy steel railway wheel increases the high temperature normalizing treatment process in the back to rolling, and is intended to refinement and homogenizing original structure, with fragility element homogenizing such as P, N in the refinement, homogenizing and the promotion steel that promote whole processing back tissue, improves railway wheel toughness.
The concrete technical scheme of heat treating method of the present invention is:
Railway wheel after will be according to common process rolling is warming up to 890 ℃～910 ℃ with stove, come out of the stove air cooling to room temperature behind the insulation 120min, again railway wheel is warming up to 740 ℃～760 ℃ with stove, behind insulation 60min ± 5min, quickly heat up to 890 ℃～910 ℃, behind the insulation 30min, water spray cooling 300s comes out of the stove, put into 510 ℃ ± 10 ℃ stoves then, behind the insulation 4h, the immersion cooling; The immersion refrigerative time is 15min～20min, adopts the normal temperature tap water to get final product.
Referring to Fig. 1, the heating curve comparison diagram of the present invention and prior art, adopt two-part quenching type of heating, first section heating is controlled at the point near Ac1 to the railway wheel temperature, create conditions for improving wheel rim two-phase region rate of heating, second section is adopted high temperature, heating in short-term, improves the two-phase region rate of heating with high furnace gas temperature, to limit austenitizing time short heat-up time.
The method of quick water-cooled can be eliminated temper brittleness after the employing tempering, and water-cooled also can change stress distribution after the tempering simultaneously, improves fatigue property.Except having higher fracture toughness property, also has the better strength and toughness proportioning through railway wheel that this kind method is heat-treated.Increase pretreatment technology, under identical conventional heating condition, KQ is improved
About; Rapid heating quenching technology wheel rim fracture toughness property is higher than conventional quenching technology, and the KQ increment all reaches
About.
Referring to Fig. 2: the conventional railway wheel wheel rim microstructure metallograph of prior art; Fig. 3: the conventional railway wheel disc microstructure metallograph of prior art; Fig. 4: railway wheel wheel rim microstructure metallograph of the present invention and Fig. 5: be railway wheel disc microstructure metallograph of the present invention.
Below by two embodiment technical scheme of the present invention is described in detail.
Wherein, the parameter of embodiment refers to that all the parameter that adopts the technology of the present invention to obtain, the parameter of Comparative Examples all refer to be used for and the parameter that obtains corresponding embodiment contrast, that adopt prior art.
Embodiment one:
The railway wheel steel chemical composition sees Table 1.
Table 1, embodiment and Comparative Examples railway wheel workpiece chemical ingredients (mass percent, wt-%):
| ??C | ??Si | ??Mn | ??P | ??S | ??Cr | ??Ni | ??Cu |
| ??0.50 | ??1.05 | ??1.00 | ??0.008 | ??0.006 | ??0.016 | ??0.006 | ??0.007 |
With the middle carbon silicomanganese low alloy steel railway wheel steel billet of composition shown in the table 1 according to common process 1270 ℃～1290 ℃ heating;
Be rolled into the railway wheel workpiece by the conventional high temperature forging and pressing of prior art subsequently, will roll the back railway wheel and respectively Comparative Examples be carried out conventional thermal treatment, embodiment one is heat-treated by method provided by the invention.
Mechanical property sees Table 2, table 3.
The mechanical property of embodiment one and Comparative Examples is roughly the same as can be seen from Table 2, has only the KQ difference, and embodiment one is higher than Comparative Examples
And the known average KQ value of testing print according to the rules and obtaining must more than or equal to
Single value can be less than this mean value, but must more than or equal to
By table 2 and table 3 data as can be known embodiment one meet the requirements fully.
The railway wheel wheel rim mechanical property result of table 2, embodiment one and Comparative Examples
The KQ result of table 3, embodiment 1
Embodiment two:
The railway wheel steel chemical composition sees Table 4.
Table 4, example and Comparative Examples railway wheel workpiece chemical ingredients (mass percent, wt-%):
| ??C | ??Si | ??Mn | ??P | ??S | ??Cr | ??Ni | ??Cu |
| ??0.54 | ??1.05 | ??1.00 | ??0.008 | ??0.006 | ??0.016 | ??0.005 | ??0.007 |
With the middle carbon silicomanganese low alloy steel railway wheel steel billet of composition shown in the table 5 according to common process 1270 ℃～1290 ℃ heating; Be rolled into the railway wheel workpiece by the forging and pressing of conventional high temperature subsequently, will roll the back railway wheel and carry out conventional thermal treatment respectively and heat-treat as Comparative Examples with by the present invention.
Mechanical property sees Table 5, table 6.
Table 5, embodiment 2 and contrast railway wheel wheel rim mechanical property result:
The KQ result of table 6, embodiment two:
By the data of table 5 and table 6 as can be known embodiment two meet the requirements fully.
In conjunction with the accompanying drawings the present invention has been carried out exemplary description above; obviously specific implementation of the present invention is not subjected to the restriction of aforesaid way; as long as adopted the improvement of the various unsubstantialities that method of the present invention design and technical scheme carry out; or design of the present invention and technical scheme are directly applied to other occasion without improving, all within protection scope of the present invention.
Claims (3)
1. the heat treating method of carbon silicomanganese low alloy steel railway wheel in a kind, it is characterized in that: according to process sequence, described heat treating method comprises water-cooled operation after 890 ℃～910 ℃ high temperature normalizing operation after rolling, 740 ℃～760 ℃+890 ℃～910 ℃ two-part quenching heating processes, 510 ℃ ± 10 ℃ the tempering.
According to claim 1 described in the heat treating method of carbon silicomanganese low alloy steel railway wheel, it is characterized in that: the railway wheel after described heat treating method is will be according to common process rolling is warming up to 890 ℃～910 ℃ with stove, come out of the stove air cooling to room temperature behind the insulation 120min, again railway wheel is warming up to 740 ℃～760 ℃ with stove, behind insulation 60min ± 5min, quickly heat up to 890 ℃～910 ℃, behind the insulation 30min, water spray cooling 300s comes out of the stove, put into 510 ℃ ± 10 ℃ stoves then, behind the insulation 4h, the immersion cooling, the immersion refrigerative time is 15min～20min.
3. according to the heat treating method of claim 1 or 2 described middle carbon silicomanganese low alloy steel railway wheels, it is characterized in that: press mass percent, the material composition of described railway wheel comprises:
C：0.50％；Si：1.05％；Mn：1.00％；P：0.008％；S：0.006％；Cr：0.016％；Ni：0.006％；Cu：0.007％。
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021301A (en) * | 2010-12-30 | 2011-04-20 | 马鞍山钢铁股份有限公司 | Thermal treatment method of high-carbon steel railway wheels |
| CN102134686A (en) * | 2011-02-25 | 2011-07-27 | 马鞍山钢铁股份有限公司 | Low-alloy wheel steel for railway wagons and wheel preparation method thereof |
| CN102230069A (en) * | 2011-06-24 | 2011-11-02 | 北京科技大学 | Heat treatment process for toughening wheel steel |
| CN103436676A (en) * | 2013-08-22 | 2013-12-11 | 马钢(集团)控股有限公司 | Heat treatment method for improving structural homogenity of rolled steel integral wheel for large-size railway vehicle |
| CN105821308A (en) * | 2016-06-07 | 2016-08-03 | 马鞍山钢铁股份有限公司 | Heat processing technology for vanadium and niobium-containing steel for motor train unit axle |
| CN114654169A (en) * | 2022-03-14 | 2022-06-24 | 宝武集团马钢轨交材料科技有限公司 | Manufacturing method of heavy-duty wheel for railway wagon |
| CN117265240A (en) * | 2023-09-27 | 2023-12-22 | 山东波鸿轨道交通装备科技有限公司 | Heat treatment method for improving fracture toughness of train wheel rim |
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| US20020074065A1 (en) * | 2000-06-01 | 2002-06-20 | Sumitomo Metal Industries, Inc. | Steel alloy for railway wheels |
| CN101314833A (en) * | 2008-02-29 | 2008-12-03 | 马鞍山钢铁股份有限公司 | Wheel steel for heavy duty goods train and manufacture method thereof |
| CN101597681A (en) * | 2009-07-09 | 2009-12-09 | 贵州大学 | A kind of process for heat-treatment on spring steel product for high-speed heavy-load trains |
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2010
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20020074065A1 (en) * | 2000-06-01 | 2002-06-20 | Sumitomo Metal Industries, Inc. | Steel alloy for railway wheels |
| CN101314833A (en) * | 2008-02-29 | 2008-12-03 | 马鞍山钢铁股份有限公司 | Wheel steel for heavy duty goods train and manufacture method thereof |
| CN101597681A (en) * | 2009-07-09 | 2009-12-09 | 贵州大学 | A kind of process for heat-treatment on spring steel product for high-speed heavy-load trains |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021301A (en) * | 2010-12-30 | 2011-04-20 | 马鞍山钢铁股份有限公司 | Thermal treatment method of high-carbon steel railway wheels |
| CN102021301B (en) * | 2010-12-30 | 2012-09-05 | 马鞍山钢铁股份有限公司 | Thermal treatment method of high-carbon steel railway wheels |
| CN102134686A (en) * | 2011-02-25 | 2011-07-27 | 马鞍山钢铁股份有限公司 | Low-alloy wheel steel for railway wagons and wheel preparation method thereof |
| CN102134686B (en) * | 2011-02-25 | 2012-12-05 | 马鞍山钢铁股份有限公司 | Low-alloy wheel steel for railway wagons and wheel preparation method thereof |
| CN102230069A (en) * | 2011-06-24 | 2011-11-02 | 北京科技大学 | Heat treatment process for toughening wheel steel |
| CN103436676A (en) * | 2013-08-22 | 2013-12-11 | 马钢(集团)控股有限公司 | Heat treatment method for improving structural homogenity of rolled steel integral wheel for large-size railway vehicle |
| CN103436676B (en) * | 2013-08-22 | 2015-09-09 | 马钢(集团)控股有限公司 | A kind of heat treating method improving large-size railway vehicle rolling steel solid wheel homogeneity of structure |
| CN105821308A (en) * | 2016-06-07 | 2016-08-03 | 马鞍山钢铁股份有限公司 | Heat processing technology for vanadium and niobium-containing steel for motor train unit axle |
| CN114654169A (en) * | 2022-03-14 | 2022-06-24 | 宝武集团马钢轨交材料科技有限公司 | Manufacturing method of heavy-duty wheel for railway wagon |
| CN117265240A (en) * | 2023-09-27 | 2023-12-22 | 山东波鸿轨道交通装备科技有限公司 | Heat treatment method for improving fracture toughness of train wheel rim |
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