CN101724777B - Hot rolled wheel rim steel plate with tensile strength of 550MPa grade and manufacturing method thereof - Google Patents
Hot rolled wheel rim steel plate with tensile strength of 550MPa grade and manufacturing method thereof Download PDFInfo
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Abstract
The invention provides hot rolled wheel rim steel with tensile strength of 550MPa grade and a manufacturing method thereof. The wheel rim steel comprises the following chemical compositions in percentage by mass: 0.02 to 0.07 percent of C, 0 to 0.3 percent of Si, 0.8 to 1.2 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.005 percent of S, 0.025 to 0.060 percent of Al, less than or equal to 0.0060 percent of N, 0 to 0.10 percent of Nb, and the balance of Fe and inevitable impurities. In the manufacturing method, the billet heating temperature is between 1,150 and 1,250 DEG C, the rolling deformation is over 80 percent; and the finish rolling temperature is between 830 and 900 DEG C, and the steel plate after finish rolling is cooled to be between 560 and 660 DEG C at a speed of between 20 and 80 DEG C/second for reeling, and is air-cooled to room temperature. While losing weight, the steel can still maintain excellent welding performance; and the method is simple and convenient to operate, and saves production cost.
Description
Technical field
The present invention relates to a kind of wheel rim steel, be specifically related to a kind of wheel rim steel plate with good tensile strength.
Background technology
In recent years, human environment protection consciousness strengthens day by day, reduces the oil consumption of automobile and reduces CO
2Discharging become a global common cry.For to reach in the multiple measure of this target, the automobile loss of weight then is very effective means.And vehicle safety is had higher requirement when implementing the automobile loss of weight, increased the demand of the good new steel iron material of HS, processing characteristics to various advanced persons.
Passenger-car chassis, wheel, suspension and on every side parts mainly adopt the hot-rolled steel sheet manufacturing, its weight accounts for more than 25% of car body gross weight greatly.Because the many component on these positions are thicker relatively, heavier, have very large loss of weight potentiality.
The high-intensity rim steel has become an important automobile steel kind.As the used for automobile wheels material, the wheel rim steel must have enough intensity, for reducing the weight of steel, then requires the intensity of steel to increase to some extent, but the decline that the intensity of general ferrous materials can be brought welding and forming property after improving usually.This requirement that is difficult to satisfy car wheel to steel plate welding and forming property.
The patent documentation relevant with the present invention is following: Japanese documentation JP56130455A discloses the high-strength plate of a kind of hot rolling, contains Ca and Ce in its composition, and intensity reaches 560-580MPa, and unit elongation is 27%; Japanese documentation JP57035663A discloses high-strength plate of a kind of hot rolling and method of manufacture thereof, adopts the retarded cooling process of 10-20 ℃/s, in steel, has formed F+B two-phase microtexture; Japanese documentation JP57155347A provides a kind of hot rolling high-strength plate, and C content is 0.067～0.082% in its composition, and containing the Mn amount is 1.52～1.70%, but does not relate to hot rolling and process for cooling; The high-strength plate of the hot rolling that Japanese documentation JP57155348A provides has added the composition of rare earth in the composition of steel, and has adopted and be lower than 500 ℃ coiling temperature; The high-strength plate of hot rolling of another Japanese documentation JP59035653A adopts than the higher Mn amount (1.20-1.88%) that contains, and adopts very low coiling temperature (200-400 ℃).The common feature of these several kinds of high-strength plates of hot rolling is C content higher (seeing table 2), and welding property is not strong; Nb content is not high, the insufficient strength of steel.
The thickness of high-intensity rim steel generally is not more than 6mm at present, after carrying out flash welding, need carry out the shaping and the enlarging operation of multiple tracks; Common SAPH carbon-manganese be the intensity of steel plate etc. often lower (≤300MPa); If simple raising C, Si, Mn content improve the intensity of steel, then can make the carbon equivalent of steel raise, destroy its welding property; Cause weld cracking when shaping and enlarging, can not satisfy the processing requirement of automotive wheel.The working method of existing wheel rim steel generally needs to need complicated process for cooling after the hot rolling through thermal treatment, complex process, and cost is higher.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of higher-strength that both had, the automobile that has certain plasticity and good welding forming performance is again used wheel rim steel plate, and the method for a kind of technology production wheel rim steel plate simple, with low cost is provided simultaneously.
The invention provides a kind of tensile strength is 550MPa level hot rolled wheel rim steel plate, and its chemical ingredients mass percent is C:0.02%～0.07%; Si:0～0.3%, Mn:0.8%～1.2%, P≤0.035%; S≤0.005%; Al:0.025%～0.060%, N≤0.0060%, Nb:0～0.10%; All the other are Fe and unavoidable impurities.
In a preferred embodiment, contain Ti≤0.05% in the chemical ingredients of the present invention.
The effect of each alloying element is following among the present invention:
C: be used to form enough carbide reinforced phase, to guarantee the intensity rank of steel, C content too low strength does not reach requirement, and C content is too high then unfavorable to welding property and forming property.
Si: in steel, play the solution strengthening effect, the too high surface of steel plate that makes easily of content produces surface imperfection such as red iron sheet, the infringement welding property.
Mn: be important solution strengthening element, cross the low undercapacity that can cause steel, too high meeting makes the decrease ductility of steel, also can cause material welding performance to descend.
P, S: be the impurity element in the steel, content should be low more good more.
Al: be the deoxidant element in the steel, can reduce oxide inclusion and pure steel in the steel, help improving the forming property of steel plate.
Nb, Ti: be effective crystal grain thinning, improve intensity and flexible element, be present in the steel with the form of carbide and carbonitride.The content range of Nb is 0-0.10% in the steel of the present invention, and is less if add-on is lower than 0.01% strengthening effect; The Ti that also can add 0-0.05%, less if add-on is lower than 0.01% strengthening effect.
It is the method for manufacture of 550MPa level hot rolled wheel rim steel plate that the present invention also provides a kind of above-mentioned tensile strength, and wherein, billet heating temperature is 1150～1250 ℃ in the hot-rolled process, and rolling reduction is greater than 80%; Finishing temperature is 830～900 ℃, and the steel plate after the finish to gauge is cooled to 560～660 ℃ and batches, and air cooling is to room temperature then.
Be preferably said rollingly carry out in the austenitic area.
Be preferably, said refrigerative speed is 20 ℃/s-80 ℃/s.
In the method for the invention, if Heating temperature is lower than 1150 ℃, then the microalloy element dissolving is insufficient, fails to make full use of microalloy element, and armor plate strength reduces.If Heating temperature is higher than 1250 ℃, the then easy alligatoring of crystal grain, unfavorable to improving steel plate toughness.
Slab carries out roughing in the crystal boundary area again at austenite; Through the recrystallize refine austenite crystal grain behind the rolling deformation, the deflection of steel plate is more than 80%, and finishing temperature is controlled at 830～900 ℃ in austenite non-recrystallization district; Rolling deformation through the austenite cold zone; The carbonitride deposition that makes the austenite crystal intragranular form deformation bands and bring out microalloy element in response to change, the phase-change product of refine austenite, the toughness of raising steel plate.
Steel plate is cooled to 560～660 ℃ and batches with 20 ℃/s-80 ℃/speed of cooling of s after the finish to gauge, batches to be lower than 560 ℃, and there is bainite structure in steel plate, is unfavorable for material welding performance.Batch the back air cooling to room temperature.
The invention has the beneficial effects as follows, adopt the hot-rolled high-strength wheel rim steel plate of composition of the present invention design, guaranteeing that the high-intensity while also can keep welding property preferably, and on the production technique without thermal treatment, so manufacturing cost is lower.Method of manufacture of the present invention need not complicated controlled cooling technology after hot rolling, just can realize with general laminar flow cooling technology, is easy to produce.
Embodiment
Embodiment 1
The chemical ingredients mass percent of wheel rim steel plate is in the present embodiment: C:0.067%, Si:0.20%, Mn:1.20%, P:0.008%, S:0.0031%, Al:0.038%, N:0.0035%, Nb:0.035%; All the other are Fe and unavoidable impurities.
Billet heating temperature is 1150～1200 ℃, is rolled in the austenitic area, and rolling reduction is greater than 80%; Finishing temperature is 870 ℃, and the steel plate after the finish to gauge is cooled to 597 ℃ with the speed of cooling of 30～60 ℃/s and batches, and air cooling is to room temperature then.The technology and the mechanical property of gained steel plate are seen table 1.
Embodiment 2
The chemical ingredients mass percent of wheel rim steel plate is in the present embodiment: C:0.067%, Si:0.20%, Mn:1.20%, P:0.008%, S:0.0031%, Al:0.038%, N:0.0035%, Nb:0.035%; All the other are Fe and unavoidable impurities.
Billet heating temperature is 1150～1200 ℃, is rolled in the austenitic area, and rolling reduction is greater than 80%; Finishing temperature is 853 ℃, and the steel plate after the finish to gauge is cooled to 563 ℃ with the speed of cooling of 50～80 ℃/s and batches, and air cooling is to room temperature then.The technology and the mechanical property of gained steel plate are seen table 1.
Embodiment 3
The chemical ingredients mass percent of wheel rim steel plate is in the present embodiment: C:0.07%, Si:0.24%, Mn:1.15%, P:0.007%, S:0.003%, Al:0.057%, N:0.0032%, Ti:0.031%, Nb:0.031%; All the other are Fe and unavoidable impurities.
Billet heating temperature is 1150～1200 ℃, is rolled in the austenitic area, and rolling reduction is greater than 80%; Finishing temperature is 850 ℃, and the steel plate after the finish to gauge is cooled to 560 ℃ with the speed of cooling of 50～80 ℃/s and batches, and air cooling is to room temperature then.The technology and the mechanical property of gained steel plate are seen table 1.
Embodiment 4
The chemical ingredients mass percent of wheel rim steel plate is in the present embodiment: C:0.07%, Si:0.24%, Mn:1.15%, P:0.007%, S:0.003%, Al:0.057%, N:0.0032%, Ti:0.031%, Nb:0.031%; All the other are Fe and unavoidable impurities.
Billet heating temperature is 1150～1200 ℃, is rolled in the austenitic area, and rolling reduction is greater than 80%; Finishing temperature is 850 ℃, and the steel plate after the finish to gauge is cooled to 620 ℃ with the speed of cooling of 20～50 ℃/s and batches, and air cooling is to room temperature then.The technology and the mechanical property of gained steel plate are seen table 1.
Embodiment 5
The chemical ingredients mass percent of wheel rim steel plate is in the present embodiment: C:0.07%, Mn:1.20%, P:0.007%, S:0.003%, Al:0.053%, N:0.0034%, Ti:0.033%, Nb:0.034%; All the other are Fe and unavoidable impurities.
Billet heating temperature is 1200～1250 ℃, is rolled in the austenitic area, and rolling reduction is greater than 80%; Finishing temperature is 883 ℃, and the steel plate after the finish to gauge is cooled to 580 ℃ with the speed of cooling of 50～80 ℃/s and batches, and air cooling is to room temperature then.The technology and the mechanical property of gained steel plate are seen table 1.
Embodiment 6
The chemical ingredients mass percent of wheel rim steel plate is in the present embodiment: C:0.07%, Mn:1.20%, P:0.007%, S:0.003%, Al:0.053%, N:0.0034%, Ti:0.033%, Nb:0.034%; All the other are Fe and unavoidable impurities.
Billet heating temperature is 1200～1250 ℃, is rolled in the austenitic area, and rolling reduction is greater than 80%; Finishing temperature is 895 ℃, and the steel plate after the finish to gauge is cooled to 620 ℃ with the speed of cooling of 30～60 ℃/s and batches, and air cooling is to room temperature then.The technology and the mechanical property of gained steel plate are seen table 1.
Embodiment 7
The chemical ingredients mass percent of wheel rim steel plate is in the present embodiment: C:0.022%, Si:0.28%, Mn:1.18%, P:0.012%, S:0.0045%, Al:0.032%, N:0.0051%, Ti:0.045%, Nb:0.051%; All the other are Fe and unavoidable impurities.
Billet heating temperature is 1200～1250 ℃, is rolled in the austenitic area, and rolling reduction is greater than 80%; Finishing temperature is 832 ℃, and the steel plate after the finish to gauge is cooled to 658 ℃ with the speed of cooling of 20～40 ℃/s and batches, and air cooling is to room temperature then.The technology and the mechanical property of gained steel plate are seen table 1.
Embodiment 8
The chemical ingredients mass percent of wheel rim steel plate is in the present embodiment: C:0.056%, Si:0.19%, Mn:0.87%, P:0.018%, S:0.0041%, Al:0.027%, N:0.003%, Nb:0.091%; All the other are Fe and unavoidable impurities.
Billet heating temperature is 1200～1250 ℃, is rolled in the austenitic area, and rolling reduction is greater than 80%; Finishing temperature is 865 ℃, and the steel plate after the finish to gauge is cooled to 607 ℃ with the speed of cooling of 30～60 ℃/s and batches, and air cooling is to room temperature then.The technology and the mechanical property of gained steel plate are seen table 1.
Comparative example
With reference to the chemical ingredients of JP59035653A, the chemical ingredients mass percent of this comparative example light plate is: C:0.08%, Mn:1.78%, P:0.084%, S:0.001%, Al:0.042%, Ti:0.023%; All the other are Fe and unavoidable impurities.
With reference to the chemical ingredients of JP57155347A, the chemical ingredients mass percent of this comparative example light plate is: C:0.067%, Si:0.21%, Mn:1.53%, P:0.088%, S:0.006%, Al:0.046%, Nb:0.042%; All the other are Fe and unavoidable impurities.
With reference to the chemical ingredients of JP56130455A, the chemical ingredients mass percent of this comparative example light plate is: C:0.08%, Si:0.08%, Mn:1.80%, P:0.01%, S:0.002%, Nb:0.021%, Ca:0.002%; All the other are Fe and unavoidable impurities.
The intensity of resultant steel plate and welding property index are seen table 1.
Table 1 the present invention compares with hardness of steel, the welding property of external related patent U.S. Patent No. document
| Finishing temperature (℃) | Coiling temperature (℃) | Ys (MPa) | Tensile strength (MPa) | Unit elongation *(％) | The welding breaking position | |
| Embodiment 1 | 870 | 597 | 498 | 574 | 33 | Mother metal |
| Embodiment 2 | 853 | 563 | 518 | 582 | 34 | Mother metal |
| Embodiment 3 | 850 | 560 | 535 | 585 | 34 | Mother metal |
| Embodiment 4 | 850 | 620 | 502 | 570 | 35 | Mother metal |
| Embodiment 5 | 883 | 580 | 525 | 580 | 34 | Mother metal |
| Embodiment 6 | 895 | 620 | 515 | 570 | 36 | Mother metal |
| Embodiment 7 | 832 | 658 | 526 | 603 | 33 | Mother metal |
| Embodiment 8 | 865 | 607 | 528 | 612 | 32 | Mother metal |
| Comparative Example J P59035653A | 200-400 | 510 | 674 | 29 | Mother metal | |
| Comparative Example J P57155347A | 599 | 30 | Mother metal | |||
| Comparative Example J P56130455A | 448 | 574 | 27.6 | Mother metal |
*Embodiment and comparative example tension specimen gauge length are 50mm.
The composition of table 2 the present invention and related patent U.S. Patent No. document and technology contrast
| JP59035653A | JP57155347A | JP56130455A | JP57155348A | JP57035663A | The present invention | |
| C | 0.05～0.10 | 0.067～0.082 | 0.07～0.08 | 0.09～0.10 | 0.03～0.07 | 0.02～0.07 |
| Si | 0.27～0.81 | 0.15～0.21 | 0.15～0.37 | 0～0.93 | 0～0.3 | |
| Mn | 1.21～1.88 | 1.52～1.7 | 1.28～1.31 | 1.25～1.36 | 1.33～1.68 | 0.8～1.20 |
| Nb | 0～0.088 | 0～0.04 | 0.02 | 0～0.05 | 0.015～0.036 | 0-0.10 |
| Ti | 0～0.048 | 0～0.035 | 0～0.04 | 0～0.06 | 0～0.05 | |
| V | 0～0.045 | |||||
| Rare earth | 0～0.008 | 0.006～0.01 | ||||
| Ca | 0～0.002 | |||||
| Ce | 0～0.0075 | |||||
| Tissue | F+P | F+P | F+P | F+P | F+B | F+P |
| Coiling temperature | 200～400℃ | <500℃ | 10-20 ℃/s slow cooling | 560～660 |
Result by table 1 and table 2 can know that steel of the present invention is compared with above patent documentation, and C content is relatively low, and welding property is better, and test Nb content simultaneously is higher, can increase the intensity of steel.Method of manufacture of the present invention need not complicated controlled cooling technology after hot rolling, just can realize with general laminar flow cooling technology, is easy to produce.
Claims (4)
1. a tensile strength is 550MPa level hot rolled wheel rim steel plate, it is characterized in that, its chemical ingredients mass percent does; C:0.02%～0.07%, Si:0～0.3%, Mn:0.8%～1.2%; P≤0.035%, S≤0.005%, Al:0.025%～0.060%; N:0.003%-0.0060%, Nb:0.031%～0.10%; All the other are Fe and unavoidable impurities; Billet heating temperature is 1150～1250 ℃ in the hot-rolled process of said steel plate production, and rolling reduction is greater than 80%; Speed of cooling after the finish to gauge is 20 ℃/s-80 ℃/s.
2. tensile strength according to claim 1 is 550MPa level hot rolled wheel rim steel plate, and its characteristic also is, contains Ti≤0.05% in the said chemical ingredients.
One kind according to claim 1 or claim 2 tensile strength be the method for manufacture of 550MPa level hot rolled wheel rim steel plate, it is characterized in that billet heating temperature is 1150～1250 ℃ in the hot-rolled process, rolling reduction is greater than 80%; Finishing temperature is 830～900 ℃, and the steel plate after the finish to gauge is cooled to 560～660 ℃ and batches, and air cooling is to room temperature then; Said refrigerative speed is 20 ℃/s-80 ℃/s.
4. be the method for manufacture of 550MPa level hot rolled wheel rim steel plate according to the said tensile strength of claim 3, it is characterized in that, said rollingly carry out in the austenitic area.
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| CN101724777B true CN101724777B (en) | 2012-04-25 |
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| CN107587054A (en) * | 2017-09-06 | 2018-01-16 | 河钢股份有限公司承德分公司 | A kind of low-carbon-equivalent easily welds 380CL wheel rims steel and its production method |
| CN107675088B (en) * | 2017-11-17 | 2019-10-01 | 武汉钢铁有限公司 | Tensile strength is >=590MPa think gauge wheel rim steel and production method |
| CN107904501A (en) * | 2017-11-20 | 2018-04-13 | 武汉钢铁有限公司 | A kind of good high intensity Thin Specs wheel of anti-fatigue performance is used and production method |
| CN111363978B (en) * | 2018-12-26 | 2021-11-16 | 宝山钢铁股份有限公司 | Welding softening resistant ferrite martensite hot-rolled dual-phase steel and manufacturing method thereof |
| CN109628839B (en) * | 2019-01-17 | 2020-05-05 | 武汉钢铁有限公司 | Wheel steel with excellent welding performance and production method thereof |
| CN113584405A (en) * | 2020-12-31 | 2021-11-02 | 马鞍山钢铁股份有限公司 | Al-containing hot-rolled high-strength low-alloy steel with tensile strength of 550MPa and manufacturing method thereof |
| CN115572902B (en) * | 2022-09-30 | 2023-08-22 | 吉林建龙钢铁有限责任公司 | Integrated steel for wheel hub and preparation method thereof |
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