CN102154589A - Steel for rear axle shaft of heavy-load commercial vehicle - Google Patents
Steel for rear axle shaft of heavy-load commercial vehicle Download PDFInfo
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- CN102154589A CN102154589A CN2011100731249A CN201110073124A CN102154589A CN 102154589 A CN102154589 A CN 102154589A CN 2011100731249 A CN2011100731249 A CN 2011100731249A CN 201110073124 A CN201110073124 A CN 201110073124A CN 102154589 A CN102154589 A CN 102154589A
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Abstract
The invention relates to steel for a rear axle shaft of a heavy-load commercial vehicle, and the rear axle shaft provided by the invention is characterized by comprising the following chemical components in percentage by weight: 0.38-0.43% of C, 0.90-1.30% of Mn, 0.50-0.70% of Cr, 0.03-0.07% of Ti, 0.0010-0.030% of B, 0.20-0.40% of Si, 0-0.035% of P and 0-0.035% of S. The chemical components are smelted by an electric furnace or a revolving furnace, the heating temperature for forging a blank is 1200+/-20 DEG C, the temperature is controlled at 500 DEG C during cooling, and after cooling, induction hardening is carried out after machining forming; and the rolling ratio of a mould casting steel ingot is larger than 3:1, and the rolling ratio of a continuous casting steel ingot is larger than 5:1. The steel provided by the invention has the advantages of low cost and obvious economic and social benefits, ensures reduced energy consumption and cost for production due to the omission of a thermal refining process for axle shaft manufacturing, and has an induction hardening layer with the depth more than 13mm.
Description
Technical field
The present invention relates to a kind of heavily loaded commercial car rear axle shaft steel, belong to the technical field of automobile steel exploitation.
Background technology
At present, increase and the energy-saving and cost-reducing requirement that waits with engine horsepower, make heavily loaded commercial car with rear axle shaft design bar footpath and design stress all in increase gradually.Simultaneously because orthodox car rear axle shaft manufacturing process is that heat treatment quenching and tempering adds the induction quench treatment, mainly be the requirement that the 42CrMoH steel is difficult to satisfy aspects such as the hardening capacity of parts and use properties with steel thereby cause existing.
Semiaxis mainly is divided into three sections on structure, i.e. spline 1, bar portion 2 and 3 three parts of ring flange.Two ends are connected with wheel hub with axle shaft gear 4 respectively, as shown in Figure 1.Because its structure and mode of connection is different, each several part mainly is the effect of bearing moment of torsion in a different manner.Spline input torque wherein, bar portion transmits moment of torsion, ring flange output torque.Structural alloy steel is adopted in the manufacturing of tradition semiaxis, and through mechanical workout, manufacturings such as modified thermal treatment and induction quenching processing form.In recent years, the commercial car weight-carrying capacity constantly increases, and rear axle shaft bar portion diameter also constantly increases, and now can not reach the product technology requirement with modified semiaxis fatigue property and the use properties made after induction is quenched of adding of material 42CrMoH steel.
Summary of the invention
The purpose of this invention is to provide a kind of heavily loaded commercial car rear axle shaft steel, it has improved the fatigue property and the work-ing life of commercial car semiaxis, saves production energy consumption, reduces manufacturing cost; It is the heavily loaded commercial car steel of the high novel highly anti-fatigue performance of a kind of cost performance.
Technical scheme of the present invention is achieved in that a kind of heavily loaded commercial car rear axle shaft steel, and it is characterized in that being made up of following chemical ingredients by weight percentage: chemical ingredients is C0.38-0.43%, Mn0.90-1.30%, Cr0.50=0.70%, Ti0.03-0.07%, B0.0010-0.030%, Si0.20-0.40%, P0-0.035%, S0-0.035%; Electric furnace or converter smelting are adopted in its materials processing, and the blank forging Heating temperature is 1200 ℃ ± 20 ℃, controlled chilling to 500 ℃, induction quenching after the machining moulding of cooling back; The rolling ratio of static ingot is greater than three to one, and the rolling ratio of continuous casting steel ingot is greater than five to one.
Positively effect of the present invention is that its cost is low, and semiaxis manufacturing cancellation quenching-and-tempering process reduces production energy consumption and cost, and this material induction quenching layer depth can reach more than the 13mm; Economic and social benefit is remarkable.
Description of drawings
Fig. 1 is heavily loaded commercial car rear axle semi-axis structure synoptic diagram.
Fig. 2 be new half axle-steel and 42CrMoH steel hardenability curve ratio.
Fig. 3 is the continuous cooling transformation curve of new half axle-steel.
Fig. 4 is new steel grade semiaxis R portion surface 500
The metallographic structure synoptic diagram.
Fig. 5 is a heart portion of R portion 100
The metallographic structure synoptic diagram.
Fig. 6 is bar portion surface 500
The metallographic structure synoptic diagram.
Fig. 7 is a bar heart portion 100
The metallographic structure synoptic diagram.
Fig. 8 is a splined surfaces 500
The metallographic structure synoptic diagram.
Fig. 9 is a splined mandrel portion 100
The metallographic structure synoptic diagram.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples:
1 material composition and mechanical property:
The automobile axle shaft in China at present big bar footpath has only a kind of material-42CrMoH steel with material.This steel has good through hardening performance, but tearing tendency is big, and processing performance and fatigue property are not good.Therefore we design and have developed new heavily loaded commercial car half axle-steel.New cars half axle-steel is mainly middle carbon MnCrB steel, and adds a certain amount of Ti element.The adding of these alloying elements has improved the through hardening performance of material, its hardening capacity and 42CrMoH steel quite or lower slightly, as shown in Figure 2.The chemical ingredients of material sees Table 1, and its mechanical property sees Table 2, and the steel continuous cooling transformation curve of mensuration is seen Fig. 3.
New steel grade is made and technological test:
80 tons of new half axle-steel have been made in industrialization.And made the car rear axle semi-axis of 60 diameters, manufacturing process is as follows:
Splined end adopts flat-die forging to be shaped electrical induction heating, infrared temperature control.1070-1080 ℃ of Forge Heating temperature forged back splined end hardness 237HBW, 6.0 grades of grain fineness numbers, and crystal grain is not seen obviously and is grown up.Flange is configured as the flat-die forging jumping-up and adds the shaping of pendulum stone roller.One fiery jumping-up: about 900 ℃ heating of Heating temperature; Two fire pendulum grind the flange moulding: Heating temperature 1060-1080 ℃.
Adopt the monoblock type induction quenching lathe of 430KW to carry out the processing of semiaxis induction quenching.Result sees Table 3.
Each the position metallographic structure of new steel grade semiaxis is shown in Fig. 4-9 behind the induction quenching.
Verification experimental verification:
The bench testing of new steel grade semiaxis is undertaken by " CAR13D498 large-tonnage highway with the bench testing of single-stage back axle " test program.Testing installation is an AB-51000 torsion machine, and test-results sees Table 4.The stand torsional fatigue test is undertaken by QC/T293 – 1999 " automobile axle shaft bench testing method ", presses QC/T294 – 1999 " automobile axle shaft technical qualification " and estimates.The semiaxis nominal torque is design set-point 27500Nm.Testing installation adopts ISTPD32F to reverse the hydraulic servo protracted test machine, and test frequency is 0.3HzM, and other test parameter and test-results see Table 4, table 5.
Test-results shows that the rig test result of novel material semiaxis satisfies the requirement of product design document and industry standard QC/T294 – 1999 " automobile axle shaft technical qualification " salable product.
Claims (1)
1. a heavily loaded commercial car rear axle shaft steel is characterized in that being made up of following chemical ingredients by weight percentage: C0.38-0.43%, Mn0.90-1.30%, Cr0.50=0.70%, Ti0.03-0.07%, B0.0010-0.030%, Si0.20-0.40%, P0-0.035%, S0-0.035%; Electric furnace or converter smelting are adopted in its materials processing, and the blank forging Heating temperature is 1200 ℃ ± 20 ℃, controlled chilling to 500 ℃, induction quenching after the machining moulding of cooling back; The rolling ratio of static ingot is greater than three to one, and the rolling ratio of continuous casting steel ingot is greater than five to one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100731249A CN102154589A (en) | 2011-03-25 | 2011-03-25 | Steel for rear axle shaft of heavy-load commercial vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100731249A CN102154589A (en) | 2011-03-25 | 2011-03-25 | Steel for rear axle shaft of heavy-load commercial vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102154589A true CN102154589A (en) | 2011-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011100731249A Pending CN102154589A (en) | 2011-03-25 | 2011-03-25 | Steel for rear axle shaft of heavy-load commercial vehicle |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104831201A (en) * | 2015-06-03 | 2015-08-12 | 山东珠峰车业有限公司 | Rear axle shaft of gas-electric hybrid four-wheel vehicle and production method thereof |
| CN109371322A (en) * | 2018-11-07 | 2019-02-22 | 邯郸钢铁集团有限责任公司 | Meet half axle-steel and its manufacturing method of immediate quenching technique |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10310823A (en) * | 1997-05-09 | 1998-11-24 | Daido Steel Co Ltd | Manufacture of shaft-shaped parts for machine structural use, excellent in fatigue characteristic |
-
2011
- 2011-03-25 CN CN2011100731249A patent/CN102154589A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10310823A (en) * | 1997-05-09 | 1998-11-24 | Daido Steel Co Ltd | Manufacture of shaft-shaped parts for machine structural use, excellent in fatigue characteristic |
Non-Patent Citations (1)
| Title |
|---|
| 应善强 等: "汽车后桥半轴用高性能非调质钢的开发及应用研究", 《汽车技术》, no. 5, 31 May 2009 (2009-05-31) * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104831201A (en) * | 2015-06-03 | 2015-08-12 | 山东珠峰车业有限公司 | Rear axle shaft of gas-electric hybrid four-wheel vehicle and production method thereof |
| CN109371322A (en) * | 2018-11-07 | 2019-02-22 | 邯郸钢铁集团有限责任公司 | Meet half axle-steel and its manufacturing method of immediate quenching technique |
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Application publication date: 20110817 |