CN102199731B - Composite microalloyed large-section non-quenched and tempered steel - Google Patents
Composite microalloyed large-section non-quenched and tempered steel Download PDFInfo
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- CN102199731B CN102199731B CN 201110128692 CN201110128692A CN102199731B CN 102199731 B CN102199731 B CN 102199731B CN 201110128692 CN201110128692 CN 201110128692 CN 201110128692 A CN201110128692 A CN 201110128692A CN 102199731 B CN102199731 B CN 102199731B
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Abstract
The invention discloses composite microalloyed large-section non-quenched and tempered steel, specifically relates to large-section rolled non-quenched and tempered steel used for a half shaft of an automobile and non-quenched and tempered steel used for a half shaft of an engineering machinery. On one hand, the strength of the large-section non-quenched and tempered steel is increased through increasing C content, and on the other hand, grains are further refined through adding microalloy elements such as Nb, V and Ti, thus maintaining certain toughness while improving strength; in addition, the fatigue strength of the half shaft is improved through employing an induction hardening method, and the hardenability of steel is improved through adding B. The invention effectively solves the use strength requirement of the large-section non-quenched and tempered steel half shaft, guarantees the fatigue life of the half shaft, improves the performance of the half shaft, lowers the cost of the half shafts, saves energy and reduces heat treatment deformation.
Description
Technical field
The present invention relates to the large section automobile axle shaft with rolling non-hardened and tempered steel and engineering machinery semiaxis non-hardened and tempered steel.
Background technology
Automobile is when bringing convenience to people's trip, oil consumption, safety and environmental protection three large problems have also been produced, how reducing the energy consumption in the automobile manufacturing process, improve the work-ing life of automobile, the manufacturing cost of reduction part, is the important technological problems that automotive industry is paid close attention to.
In the auto parts, a large amount of axial workpieces is arranged.Such as the automobile axle shaft per car 2-4 root is just arranged, every of Light-duty Vehicle semiaxis is heavy more than 10 kilograms, the heavy goods vehicles semiaxis weighs more than 20 kilograms, these axial workpieces, particularly semiaxis, multiplex quenched and tempered steel manufacturing, when auto output reaches 1,800 ten thousand, semiaxis on average calculates by kilogram, and every automobile-used two semiaxis calculate, and then year half axle-steel is above 540,000 tons.Every modified one kilogram steel part, consumption of calorie 686KJ, namely 163.3Kcal is equivalent to 0.19KWh, calculates by these data, and the current consumption of annual modified semiaxis is 1.03 hundred million degree.The every production 1 degree electricity of thermoelectricity will discharge 1.04 kilograms of CO2.Therefore, the CO2 of annual modified automobile axle shaft generation discharges approximately 110,000 tons; Simultaneously, modifier treatment also will consume quenching oil, and the oil smoke of generation is also wanted contaminate environment, cleans the waste water source, and quenching process also can make part produce distortion, oxidation and decarbonization, affects the quality of part.Therefore, use non-hardened and tempered steel and replace modified part, the elimination hardening and tempering process that quenched and tempered steel making automobile is widely applied, effectively energy-saving and emission-reduction, reduce environmental pollution, avoid the waste of quenching oil, promote and improve the Performance and quality of part, reducing production costs etc. all acquires a special sense.
Non-hardened and tempered steel results from early 1980s, and Thyssen company has at first developed non-hardened and tempered steel.Produce and supply automobile industry take 49MnVS3 as representative, published an article in 1981, thereby become classical works and the basic grade of steel of non-hardened and tempered steel, worldwide widespread use, replace a series of quenched and tempered steel such as 50Mn, 40Cr, made automobile axle shaft, improved the quality of forging, improved cutting ability and fatigue property, reduced production costs.The non-hardened and tempered steel characteristics are energy-conservation, shorten the production cycle, and the workpiece section hardness is evenly distributed, and is out of shape little.Early stage non-hardened and tempered steel mainly is that ferrite adds the perlite non-hardened and tempered steel, and this class steel mainly is that the C-Mn steel adds the V microalloying, by crystal grain thinning and tissue, guarantees the performance of part.The general cross section of using of this class non-hardened and tempered steel is less.
Summary of the invention
The object of the present invention is to provide a kind of trace elements such as Nb, V, Ti, B that added, effectively the large section non-hardened and tempered steel of the combined microalloying of crystal grain thinning and raising hardening capacity.
The technical solution used in the present invention realizes: a kind of large section non-hardened and tempered steel of combined microalloying, its chemical composition is by weight percentage: C:0.36% ~ 0.45%, Mn:0.8% ~ 1.5%, Si:0.2% ~ 0.4%, Cr:0.3% ~ 0.6%, V:0.04% ~ 0.10%, Nb:0.02% ~ 0.04%, P≤0.035%, S≤0.035%, B:0.001% ~ 0.0035%, Ti:0.02% ~ 0.04%.
A kind of production stage of large section non-hardened and tempered steel semiaxis of combined microalloying is as follows:
Metallurgical and rolling Production Flow Chart: 100t EAF → 100tLF → 100t VD → CCM(340*300mm) → slow cooling or temperature send → heating rolling → control cooling → cut-out → aligning → chamfered edge → check, reconditioning → packing, warehouse-in; Then the continuously cast bloom that the steel of smelting gained are cast into forges with rolling, and 1180～1250 ℃ of Heating temperatures begin to roll 1100～1200 ℃ of temperature, 900～1000 ℃ of finishing temperatures, cooling control after rolling, 5～15 ℃/s of speed of cooling.
Work flow: blanking → aligning → machining → induction quenching → cleaning, the case depth＞10mm behind the induction quenching.
The present invention increases C content and improves large section non-hardened and tempered steel intensity, adds simultaneously the Nb-V combined microalloying and guarantees to obtain thin crystal grain and pearlitic thin sheet spacing, is carrying the high-intensity while, keeps certain toughness.
The present invention takes induction hardened method in order to improve the fatigue strength of semiaxis.For guaranteeing the degree of depth of induction quenching layer, improve the hardening capacity of steel by adding B.
But the adding of Ti is crystal grain thinning both, has guaranteed again the effect of effective B, reaches desirable depth of hardening zone when making the semiaxis surface induction hardening, thereby has guaranteed the fatigue lifetime of semiaxis.
The large section non-hardened and tempered steel that adopts above-mentioned materials and processing step to obtain, its quiet torsional test result＞35000 N-m; By standard GB/T 2975-1998, regulation cuts 3 mechanical property samples and impact specimen from rolling blank diameter two/Radius.The mean value of 3 samples is: yield strength Rp
0.2〉=550 MPa; Tensile strength Rm 〉=850MPa; Elongation after fracture A
5〉=14%; Relative reduction in area Z 〉=40%; Hardness 〉=260 HB; Shock test impact absorbing energy mean value Aku 〉=38.43 J.
One aspect of the present invention improves the intensity of large section non-hardened and tempered steel by improving C content, increase on the other hand other microalloy elements, and further crystal grain thinning keeps certain toughness; Take induction hardened method, improve the fatigue strength of semiaxis; For guaranteeing the degree of depth of induction quenching layer, add the hardening capacity that B improves steel.The present invention efficiently solves large section non-hardened and tempered steel semiaxis working strength requirement, has guaranteed the fatigue lifetime of semiaxis, has improved the semiaxis performance, has reduced the cost of semiaxis, and save energy reduces heat treatment deformation.
Description of drawings
Fig. 1 shock test curve and result.
Embodiment
Embodiment, a kind of large section non-hardened and tempered steel of combined microalloying, its chemical composition is by weight percentage: C 0.39, and Si 0.30, and Mn 1.20, P 0.014, and S 0.008, and Cr 0.50, and Al 0.016, Ti 0.028, and V 0.119, and Nb 0.018, and B 0.0012.
The dozer semiaxis technique made from above-described embodiment material is as follows:
100t EAF → 100tLF → 100t VD → CCM(340*300mm) → slow cooling or temperature send → heating rolling → control cooling → cut-out → aligning → chamfered edge → check, reconditioning → packing, warehouse-in.The steel of smelting gained are cast into the continuously cast bloom of 340 * 300 mm, then forge with rolling, and 1180 ± 20 ℃ of Heating temperatures begin to roll 1100 ℃ of temperature, 900 ℃ of finishing temperatures, and cooling control after rolling, stocking is of a size of 60mm, 10 ℃/s of speed of cooling;
Round steel blanking → aligning → machining---rolling or milling spline → induction quenching → cleaning, the case depth behind the induction quenching are 11mm.
Semiaxis is carried out quiet torsional test, breakaway torque is 38500Nm, and the modified semiaxis of 40Cr is 34600Nm, satisfy the service requirements of large section semiaxis, the safety factor proof of distance surface 0～8.5mm shows, the safety coefficient of every one deck all is higher than 0.5～1 unit of 40Cr, has guaranteed the security that semiaxis uses.
The SEM structure observation shows: perlite sheet spacing is reduced into non-hardened and tempered steel without Nb, and (perlite sheet spacing is 0.33～0.35
μ m) 25% ~ 30%(be 0.08～0.10
μ m), the ductility width that plays split plot and eventual failure district of impact fracture is average out to 370 respectively
μ mWith 170
μ m, and the ductility part that plays split plot and eventual failure district of the impact fracture of the non-hardened and tempered steel that does not contain Nb of intensity rank roughly the same is respectively 45
μ mWith 100
μ m(above impact specimen is the U-shaped breach standard test specimen of 10*10*55); Its tensile property is Rp
0.2650MPa, Rm 920MPa, A
516.7%, Z 47%, and HB 260, Aku 40J.
Claims (1)
1. the large section non-hardened and tempered steel of a combined microalloying, its chemical composition is by weight percentage: C:0.36% ~ 0.45%, Mn:0.8% ~ 1.5%, Si:0.2% ~ 0.4%, Cr:0.3% ~ 0.6%, V:0.04% ~ 0.10%, Nb:0.02% ~ 0.04%, P≤0.035%, S≤0.035%, B:0.001% ~ 0.0035%, Ti:0.02% ~ 0.04%; The metallurgical technology rules are smelted routinely, and the material of smelting gained pours into continuously cast bloom and is rolled, and the compression ratio that stocking final size and continuously cast bloom size determine is greater than 6; 1180 ± 20 ℃ of rolling Heating temperatures, start rolling temperature＞1100 ℃, finishing temperature 〉=900 ℃, cooling control after rolling, 5～15 ℃/s of speed of cooling; Through blanking → aligning → machining → induction quenching → cleaning, it is characterized in that: the case depth＞10mm behind the induction quenching; Quiet moment of torsion＞35000 N-m; The SEM structure observation: perlite sheet spacing is 0.08～0.10um, from rolling blank diameter two/Radius, by standard GB/T 2975-1998, regulation cuts 3 mechanical property samples, and the mean value of test-results is: yield strength Rp0.2 〉=550 MPa; Tensile strength Rm 〉=850MPa; Elongation after fracture A
5〉=14%; Relative reduction in area Z 〉=40%; Hardness 〉=260 HB; Shock test impact absorbing energy mean value Aku 〉=38.4J.
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103526117A (en) * | 2012-07-03 | 2014-01-22 | 广西柳工机械股份有限公司 | Non-quenched and tempered steel, engineering mechanical semiaxle manufactured by using same and manufacturing method of semiaxle |
| CN103572030A (en) * | 2012-07-24 | 2014-02-12 | 洪泽县汽车半轴制造有限公司 | Novel auto semi-axle quenching process |
| CN103789660B (en) * | 2014-01-21 | 2016-07-13 | 广西柳工机械股份有限公司 | Micro Alloying hinging pin shaft and manufacture method thereof |
| CN104313287A (en) * | 2014-11-04 | 2015-01-28 | 重庆大江工业有限责任公司 | Intermediate frequency quenching process for half shaft of heavy truck |
| CN106521336B (en) * | 2016-11-09 | 2017-12-26 | 江苏沙钢集团淮钢特钢股份有限公司 | Instead of the knuckle non-hardened and tempered steel and its production method of 40Cr quenched and tempered steel |
| CN109554618A (en) * | 2017-09-26 | 2019-04-02 | 陕西汽车集团有限责任公司 | Non-hardened and tempered steel and the method that automobile axle shaft is manufactured using non-hardened and tempered steel |
| CN108103395B (en) * | 2017-11-17 | 2019-08-27 | 徐工集团工程机械有限公司 | A kind of non-hardened and tempered steel thrust wheel and preparation method thereof |
| CN108193136B (en) * | 2018-02-09 | 2019-11-01 | 天津荣程联合钢铁集团有限公司 | A kind of 40Cr hot rolled circular steel and its production method |
| CN109234606A (en) * | 2018-09-25 | 2019-01-18 | 湖南华菱湘潭钢铁有限公司 | A kind of production method of track link rail hot rolled circular steel |
| CN109837461A (en) * | 2019-02-15 | 2019-06-04 | 江苏利淮钢铁有限公司 | A kind of the water jacket non-hardened and tempered steel and its manufacturing method of new-energy automobile |
| CN115213646A (en) * | 2022-07-26 | 2022-10-21 | 陕西法士特齿轮有限责任公司 | Non-quenched and tempered steel power takeoff connecting shaft and machining method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1330166A (en) * | 2001-06-26 | 2002-01-09 | 宝山钢铁股份有限公司 | Microalloyed low-carbon bainite ferrite steel and its preparing process |
| CN101526046A (en) * | 2008-03-04 | 2009-09-09 | 日产自动车株式会社 | Piston ring |
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2011
- 2011-05-18 CN CN 201110128692 patent/CN102199731B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1330166A (en) * | 2001-06-26 | 2002-01-09 | 宝山钢铁股份有限公司 | Microalloyed low-carbon bainite ferrite steel and its preparing process |
| CN101526046A (en) * | 2008-03-04 | 2009-09-09 | 日产自动车株式会社 | Piston ring |
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Inventor after: Ma Mingtu Inventor after: Deng Yingzhang Inventor after: Hou Huoran Inventor after: Zhang Wei Inventor after: Meng Qiuhong Inventor after: Tian Qingliang Inventor after: Yang Hongya Inventor after: Wang Guoan Inventor after: Zhao Guogang Inventor after: Lu Nanfa Inventor after: Zhang Wei Inventor after: Mei Huasheng Inventor before: Ma Mingtu Inventor before: Tian Qingliang Inventor before: Yang Hongya Inventor before: Zhao Guogang Inventor before: Lu Nanfa Inventor before: Zhang Wei Inventor before: Mei Huasheng Inventor before: Hou Huoran Inventor before: Zhang Wei |
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Free format text: CORRECT: INVENTOR; FROM: MA MINGTU TIAN QINGLIANG YANG HONGYA ZHAO GUOGANG LU NANFA ZHANG WEI MEI HUASHENG HOU HUORAN ZHANG WEI TO: MA MINGTU MENG QIUHONG TIAN QINGLIANG YANG HONGYA WANG GUOAN ZHAO GUOGANG LU NANFA ZHANG WEI MEI HUASHENG DENG YINGZHANG HOU HUORAN ZHANG WEI |
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Effective date of registration: 20161009 Address after: 472000 Eastern District of Sanmenxia Economic Development Zone, Henan province (front and rear mountain village) Patentee after: Henan Suda Electric Automobile Technology Co. Ltd. Address before: 400039 Chongqing Jiulongpo chenjiaping Automobile Institute Jiashuyuan Patentee before: Ma Mingtu |