CN104480389B - Hot rolled band for automotive axle housing and manufacturing method thereof - Google Patents
Hot rolled band for automotive axle housing and manufacturing method thereof Download PDFInfo
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- CN104480389B CN104480389B CN201510002812.4A CN201510002812A CN104480389B CN 104480389 B CN104480389 B CN 104480389B CN 201510002812 A CN201510002812 A CN 201510002812A CN 104480389 B CN104480389 B CN 104480389B
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Abstract
The invention relates to a hot rolled band for an automotive axle housing and a manufacturing method of the hot rolled band and belongs to the technical field of production of hot rolled bands. The hot rolled band for the automotive axle housing is composed of, by weight, 0.12 or less percent of C, 0.05-0.15 percent of Si, 1.10-1.50 percent of Mn, 0.015-0.035 percent of Nb, 0.010-0.060 percent of ALs, 0.025 or less percent of P and 0.010 or less percent of S, and the balance Fe and inevitable impurities. The manufacturing method of the hot rolled band comprises the following steps of pretreatment of hot metal, furnace revolving, external refining, slab casting, heating, high-pressure water descaling, rough rolling, coil box coiling, fine rolling, cooling and coiling. The method is easy to control and high in adaptability. The hot rolled band for the automotive axle housing is high in strength, stable in mechanical property and good in welding performance and forming performance.
Description
Technical field
The present invention relates to a kind of automobile axle housing hot rolled strip and preparation method thereof, belong to hot continuous rolling strip production technology neck
Domain.
Background technology
In recent years, increasingly tight to the negative effect of living environment with exhaust emissions with rising steadily of vehicle fuel expense
Again, how continuous improvement Crash Safety Design of Vehicles being required along with people, make vehicle body on the premise of guarantee is safe, comfortable
Loss of weight is the key solving this series of problems.Therefore promote automotive body structure and material therefor that very big change is just occurring
Change.
Axle housing is one of main member of running car system, for many years the heavy rear axle housing with medium truck vehicle bridge of China
Adopt casting technique to produce more, there is complex process, low production efficiency, pollute the problems such as environment, heaviness, high cost.For adapting to
Development need, each automobile factory is continuously increased to the high-strength steel band demand of cold stamping shaped punching-welding axle housing, but due to also
There is no axle housing special-purpose steel and corresponding standard, automobile factory have to select the substitution material such as 16mnl, 09sivl, q345b, by
Rushing of axle housing can not be met in these materials and be welded into shape needs, it is poor forming accuracy usually, percent defective is high, raw materials consumption is big
And punching weldering problems of crack, have a strong impact on product quality and service life.For this reason, each iron and steel enterprise continually develops new automobile
Axle housing hot rolled strip, has carried out the production of tensile strength 510mpa level automobile axle housing steel band one after another.
For example: number of patent application is cn200910063835, invention entitled " a kind of tensile strength 510mpa level automobile is used
Hot rolling stamping axle housing steel and preparation method thereof ", chemical component weight percentage ratio of hot rolling stamping axle housing steel of automobile disclosed in it
For: c0.12～0.20%, si 0.20～0.60%, mn 1.20～1.60%, p≤0.030%, s≤0.008%, als
0.01～0.06% and ti 0.005～0.030%, remaining is fe and inevitable impurity.Contain higher carbon and silicon, lead to
Cross microalloy titanium and carry out improving welding property, its stability is relatively poor.
And for example: number of patent application be cn201210319124, invention entitled " material of high-strength vehicle axle housing steel plate with
Axle housing manufacture method ", disclosed in it, the chemical composition of high-strength vehicle axle housing steel plate materialses is by weight percentage: c:0.10～
0.20%, si:0.20～0.60%, mn:1.00～1.70%, p≤0.025%, s≤0.010%, ti≤0.05%, v≤
0.20%, nb≤0.10%, cr≤0.30%, ni≤0.80%, cu≤0.55%, alt:0.020～0.065%, nb+v+ti
≤ 0.22%, balance of fe and inevitable impurity.After axle housing steel plate materialses hot forming, it is by adjusting welding procedure ginseng
Number, welding material and technological process, to solve axle case assy in the problem on deformation after overvoltage, welding, machining.
Content of the invention
First technical problem to be solved by this invention is: provides the automobile axle housing heat that a kind of welding performance is more preferable
Strip rolling.
Automobile axle housing hot rolled strip of the present invention, by weight percentage its chemical composition are: c≤0.12%, si 0.05%
～0.15%, mn 1.10%～1.50%, nb 0.015%～0.035%, als 0.010%～0.060%, p≤
0.025%, s≤0.010%, remaining is fe and inevitable impurity.
The yield strength of above-mentioned automobile axle housing hot rolled strip is 410～510mpa, and tensile strength is 510～610mpa,
Elongation percentage is more than 25%.
Second technical problem to be solved by this invention is: offer is a kind of to prepare above-mentioned automobile axle housing hot rolled strip
Method.
The method that the present invention prepares above-mentioned automobile axle housing hot rolled strip, it comprises the following steps: molten iron pretreatment → turn
Stove → external refining → casting slab → heating → high-pressure water descaling → roughing → Coil Box batches → and finish rolling → section cooling →
Batch.
In the above-mentioned method preparing automobile axle housing hot rolled strip, in heating stepses slab be preferably heated to 1200 DEG C～
Come out of the stove for 1260 DEG C, the start rolling temperature in finish rolling step is 950 DEG C～1050 DEG C, finishing temperature is 850 DEG C～890 DEG C.
In the above-mentioned method preparing automobile axle housing hot rolled strip, the steel band after finish to gauge is after air cooling plus back segment section cooling
Curling.Wherein, laminar flow cooling rate is preferably 3～50 DEG C/s, and laminar flow cooling rate is more preferably 20～30 DEG C/s.
In the above-mentioned method preparing automobile axle housing hot rolled strip, preferably section cooling to 530～600 DEG C when rolled up
Bent.
Based on the present invention adopts with carbon and manganese as solution strengthening, by adding refined crystalline strengthening and precipitating reinforcing effect in steel
Preferably Nb-microalloying element, in addition, by the content controlling each chemical composition, and hot rolling is passed through to formulate controlled rolling and controlled cooling work
Skill system, produces the steel band that finished product is organized as ferrite+pearlite, and its product grains degree is 10.5～12.5 grades, and mechanics
Stable performance, and there is excellent welding performance and forming property, tensile strength is more than 510mpa.
The inventive method controls simple, strong adaptability, and automobile axle housing of the present invention is high with hot rolled strip intensity, and mechanical property is steady
Determine, welding performance and forming property are good.
Specific embodiment
Automobile axle housing hot rolled strip of the present invention is that its chemical composition is by weight percentage: c≤0.12%, si
0.05%～0.15%, mn 1.10%～1.50%, nb 0.015%～0.035%, als 0.010%～0.060%, p≤
0.025%, s≤0.010%, remaining is fe and inevitable impurity.
Inventor with carbon and manganese as solution strengthening based on, add trace niobium as refined crystalline strengthening element, it is to avoid
Add the inconstant elements such as ti, preferable crystal grain refinement and precipitating reinforcing effect are played by controlled rolling and control cooling, raw
Output welding performance more preferable automobile hot rolled strip so that the yield strength of this hot rolled strip is 410～510mpa, tension
Intensity is
510～610mpa, elongation percentage is more than 25%.
The method that the present invention prepares above-mentioned automobile axle housing hot rolled strip, its technical process is: molten iron pretreatment → converter
→ external refining → casting slab → heating → high-pressure water descaling → roughing → Coil Box batches → finish rolling → section cooling → volume
Take.Wherein from be heated to batch step be hot continuous rolling process step.
In said method, in heating stepses, slab is preferably heated to 1200 DEG C～1260 DEG C and comes out of the stove, opening in finish rolling step
Roll temperature and be 950 DEG C～1050 DEG C, finishing temperature is 850 DEG C～890 DEG C.Steel band after finish to gauge is through air cooling plus back segment section cooling
After crimp.Wherein, laminar flow cooling rate is preferably 3～50 DEG C/s, and laminar flow cooling rate is more preferably 20～30 DEG C/s.
In said method, it is preferably cooled to after section cooling be batched when 530～600 DEG C.
The present invention adopts based on carbon and manganese solution strengthening, by interpolation refined crystalline strengthening and precipitating reinforcing effect in steel relatively
Good Nb-microalloying element, in addition, by the content controlling each chemical composition, and hot rolling is passed through to formulate cooling controlling and rolling controlling process
System, produces the steel band that finished product is organized as ferrite+pearlite, and its product grains degree is 10.5～12.5 grades, mechanical property
Stable, there is excellent welding performance and forming property, tensile strength is more than 510mpa.
With reference to embodiment, the specific embodiment of the present invention is further described, therefore the present invention is not limited
System is among described scope of embodiments.
Embodiment 1
The chemical component weight percentage ratio of automobile axle housing hot rolled strip of the present invention and preparation method thereof is: 0.08%c,
0.12%si, 1.35%mn, 0.015%nb, 0.031%als, 0.017%p, 0.006%s, balance of fe and unavoidably miscellaneous
Prime element forms；It is cast into the thick continuous casting steel billet of 230mm with conventional continuous cast method；It is heated to 1250 DEG C and carry out roughing, slightly
Rolling rear workpiece thickness is 50mm；Finish rolling start rolling temperature is 1020 DEG C, and finish rolling finishing temperature is 870 DEG C；Cooling rate with 20 DEG C/s
It is cooled to 560 DEG C to carry out batching rolling.Finished product mechanical property is yield strength 490mpa, tensile strength 580mpa, and elongation percentage is
30%.
Embodiment 2
The chemical component weight percentage ratio of automobile axle housing hot rolled strip of the present invention and preparation method thereof is: 0.06%c,
0.10%si, 1.20%mn, 0.025%nb, 0.035%als, 0.017%p, 0.008%s, balance of fe and unavoidably miscellaneous
Prime element forms；It is cast into the thick continuous casting steel billet of 230mm with conventional continuous cast method；It is heated to 1230 DEG C and carry out roughing, slightly
Roll rear intermediate slab thickness in 40mm；Finish rolling start rolling temperature is 980 DEG C, and finish rolling finishing temperature is 850 DEG C；With 25 DEG C/s after finish rolling
Cooling rate be cooled to 580 DEG C and carry out batching rolling.Finished product mechanical property is yield strength 455mpa, and tensile strength 545mpa is prolonged
Stretch rate 33%.
Embodiment 3
The chemical component weight percentage ratio of automobile axle housing hot rolled strip of the present invention and preparation method thereof is: 0.10%c,
0.08%si, 1.35%mn, 0.015%nb, 0.047%als, 0.014%p, 0.005%s, balance of fe and unavoidably miscellaneous
Prime element forms；It is cast into the thick continuous casting steel billet of 230mm with conventional continuous cast method；It is heated to 1240 DEG C and carry out roughing, slightly
Roll rear intermediate slab thickness in 44mm；Finish rolling start rolling temperature is 985 DEG C, and finish rolling finishing temperature is 860 DEG C；With 20 DEG C/s after finish rolling
Cooling rate be cooled to 540 DEG C and carry out batching rolling.Finished product mechanical property is yield strength 500mpa, and tensile strength 580mpa is prolonged
Stretch rate 28%.
Embodiment 4
The chemical component weight percentage ratio of automobile axle housing hot rolled strip of the present invention and preparation method thereof is: 0.07%c,
0.10%si, 1.30%mn, 0.03%nb, 0.053%als, 0.013%p, 0.003%s, balance of fe and unavoidably miscellaneous
Prime element forms；It is cast into the thick continuous casting steel billet of 230mm with conventional continuous cast method；It is heated to 1220 DEG C and carry out roughing, slightly
Roll rear intermediate slab thickness in 55mm；Finish rolling start rolling temperature is 1010 DEG C, and finish rolling finishing temperature is 850 DEG C；After finish rolling with 25 DEG C/
The cooling rate of s is cooled to 550 DEG C and carries out batching rolling.Finished product mechanical property is yield strength 485mpa, and tensile strength 570mpa is prolonged
Stretch rate 33%.
Embodiment 5
The chemical component weight percentage ratio of automobile axle housing hot rolled strip of the present invention and preparation method thereof is: 0.07%c,
0.13%si, 1.40%mn, 0.018%nb, 0.026%als, 0.011%p, 0.006%s, balance of fe and unavoidably miscellaneous
Prime element forms；It is cast into the thick continuous casting steel billet of 230mm with conventional continuous cast method；It is heated to 1245 DEG C and carry out roughing, slightly
Roll rear intermediate slab thickness in 50mm；Finish rolling start rolling temperature is 980 DEG C, and finish rolling finishing temperature is 885 DEG C；With 30 DEG C/s after finish rolling
Cooling rate be cooled to 555 DEG C and carry out batching rolling.Finished product mechanical property is yield strength 450mpa, and tensile strength 555mpa is prolonged
Stretch rate 32%.
Claims (1)
1. a kind of automobile axle housing hot rolled strip it is characterised in that: its chemical composition is by weight percentage: c 0.06%, si
0.10%, mn 1.20%, nb 0.025%, als 0.035%, p 0.017%, s 0.008%, balance of fe and can not keep away
Exempt from impurity element composition；
Its preparation method is: is cast into the thick continuous casting steel billet of 230mm with conventional continuous cast method；It is heated to 1230 DEG C to carry out slightly
Roll, after roughing, intermediate slab thickness is in 40mm；Finish rolling start rolling temperature is 980 DEG C, and finish rolling finishing temperature is 850 DEG C；After finish rolling with
The cooling rate of 25 DEG C/s is cooled to 580 DEG C and carries out batching rolling；
Finished product mechanical property is yield strength 455mpa, tensile strength 545mpa, elongation percentage 33%.
Priority Applications (1)
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| CN201510002812.4A CN104480389B (en) | 2015-01-05 | 2015-01-05 | Hot rolled band for automotive axle housing and manufacturing method thereof |
Applications Claiming Priority (1)
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| CN201510002812.4A CN104480389B (en) | 2015-01-05 | 2015-01-05 | Hot rolled band for automotive axle housing and manufacturing method thereof |
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| CN104480389B true CN104480389B (en) | 2017-01-25 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106480367A (en) * | 2015-08-28 | 2017-03-08 | 宝钢集团新疆八钢铁有限公司 | A kind of production method of high-strength cold-formed automobile axle housing steel |
| CN105220070A (en) * | 2015-11-12 | 2016-01-06 | 攀钢集团攀枝花钢铁研究院有限公司 | The minimizing technology of a kind of hot-rolled steel sheet and scale on surface thereof |
| CN105349881A (en) * | 2015-11-13 | 2016-02-24 | 浙江荣鑫带钢有限公司 | Preparing method of strip steel for volute spiral spring |
| CN108588550A (en) * | 2018-01-19 | 2018-09-28 | 河钢股份有限公司承德分公司 | A kind of hot rolling press axle housing steel plate and its production method |
| CN112517638B (en) * | 2020-10-20 | 2022-07-22 | 江苏省沙钢钢铁研究院有限公司 | Control method of hot-rolled high-strength steel strip-shaped structure for cold roll forming |
| CN114134415A (en) * | 2021-11-15 | 2022-03-04 | 山东钢铁集团日照有限公司 | Low-temperature high-toughness low-alloy medium-thickness steel plate and preparation method thereof |
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| CN101280390B (en) * | 2008-04-19 | 2011-12-21 | 马鞍山钢铁股份有限公司 | High-strength hot rolled steel plate and manufacturing method thereof |
| JP2009280870A (en) * | 2008-05-23 | 2009-12-03 | Sumitomo Metal Ind Ltd | Steel plate for axle housing |
| CN101824525B (en) * | 2010-05-07 | 2012-01-11 | 攀钢集团钢铁钒钛股份有限公司 | Production method of hot milling steel plate |
| CN101899611A (en) * | 2010-08-27 | 2010-12-01 | 攀钢集团钢铁钒钛股份有限公司 | Structural hot rolled steel plate and production method thereof |
| CN102383032B (en) * | 2011-11-07 | 2013-07-03 | 武汉钢铁(集团)公司 | Production method of steel for 12-ton axle shell |
| CN103805862B (en) * | 2014-02-19 | 2016-02-03 | 山东交通职业学院 | Axle shell steel and preparation method thereof |
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