CN101928881A - Hot rolling high-chambering steel plate with tensile strength of 590 MPa and manufacturing process thereof - Google Patents
Hot rolling high-chambering steel plate with tensile strength of 590 MPa and manufacturing process thereof Download PDFInfo
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- CN101928881A CN101928881A CN200910053943XA CN200910053943A CN101928881A CN 101928881 A CN101928881 A CN 101928881A CN 200910053943X A CN200910053943X A CN 200910053943XA CN 200910053943 A CN200910053943 A CN 200910053943A CN 101928881 A CN101928881 A CN 101928881A
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Abstract
The invention discloses a hot rolling high-chambering steel plate with the tensile strength of 590 MPa. The steel plate comprises the following chemical compositions in percentage by weight: 0.02-0.10 percent of C, 0-1.6 percent of Si, 0.8-2.0 percent of Mn, smaller than or equal to 0.035 percent of P, smaller than or equal to 0.010 percent of S, 0.025-0.060 percent of Al, smaller than or equal to 0.0060 percent of N, 0-0.10 percent of Nb, 0-0.04 percent of Ti, 0-0.0050 percent of Ca and the balance of Fe and unavoidable impurities. The manufacturing process of the hot rolling high-chambering steel plate comprises the following steps of: heating a steel billet at 1,150-1,250 DEG C, and then rolling in an austenitic area, wherein the rolling deformation is larger than 80 percent, and the finish rolling temperature is 830-900 DEG C; cooling the steel plate after finish rolling to 600-750 DEG C at a cooling speed of 50-100 DEG C/s; cooling for 3-10 seconds in the air at a cooling speed of 5-15 DEG C/s; then cooling the steel plate to 350-500 DEG C at a cooling speed of 70 DEG C/s and reeling; and then cooling in the air to room temperature. The steel plate is particularly suitable for manufacturing a chassis component of a car.
Description
Technical field
The invention belongs to metal material field, relate in particular to the ferrous alloy that contains C, Si, Mn, Nb, Ti etc., be a kind of 590MPa above hot rolling high-chambering steel plate and manufacturing process thereof of need not heat treated tensile strength reaching, this steel plate is particularly suitable for making the vehicle chassis component of car.
Background technology
In recent years, because human environment protection consciousness strengthens day by day, reduce the oil consumption of automobile and reduce CO
2Discharging become a global common cry, in for the multiple measure that reaches this target, the automobile loss of weight then is very effective means.The trend that this is global and to the attention of vehicle safety has been brought the demand of the good novel ferrous materials of high strength, processing characteristics to various advanced persons.
Hot-rolled steel sheet is mainly used in passenger-car chassis, wheel, suspension and parts on every side thereof, and its weight accounts for more than 25% of car body gross weight greatly.Because the many component on these positions have very complicated shape, require steel plate to have good press formability, and higher reaming (or flange) performance promptly are one of them very important index requests.
For satisfying the working conditions of steel plate on passenger-car chassis, generally there are two kinds of selections in past, a kind of be to use the steel plate that intensity reduces (≤300MPa), to obtain higher reaming performance; Another kind is to reduce the flange amount in detail design, to reduce steel plate reaming performance demands.Along with improving constantly of automobile steel intensity, orthodox car decreases with the hole expansibility of steel, has been difficult to satisfy the requirement of passenger-car chassis to the steel plate hole expansibility.And along with the requirement of Automobile Design to chassis structure improves day by day, its part shape is increasingly sophisticated, and requirement of strength improves constantly, and the steel plate hole expansibility is also increased to some extent, and high reaming steel has become an important automobile steel kind.
The thickness of high reaming steel generally is not more than 6mm, and common SAPH carbon/manganese is the reaming performance often lower (≤70%) of steel plate etc., can not satisfy the forming property requirement of some complex-shaped component of automobile chassis.
For the technology of high reaming steel, U.S. Pat 2006096678 disclosed hot-rolled steel sheet intensity are more than the 780MPa, and unit elongation is more than 22%, and hole expansibility is more than 60%.
U.S. Pat 4415376 disclosed hot-rolled steel sheet yield strengths are more than the 80ksi (550MPa), and hole expansibility is more than 58%, and adopt Nb, V to strengthen.
The disclosed hot-rolling high-strength steel plate of Japanese Patent JP2006305700 adopts the composition design of C-Si-Mn+Ti, obtains more than the tensile strength 780MPa, and hole expansibility is more than 68%.
The disclosed hot rolling high-chambering steel of Japanese Patent JP2003/016614, carbon content 0.02～0.10%, Si≤0.5%, its tensile strength also is 〉=590MPa, but it has added alloying elements such as many Nb, Ti, V, Cr, RE, but is major objective with the surface of good coating.
Japanese Patent JP 2006063394 disclosed hot rolling high-chambering steel, carbon content 0.20～0.48%, Si is 0～1.0%, its tensile strength 〉=440MPa, it has added the Cr alloying element, and hole expansibility is more than 70%.
The data of above-mentioned prior art can be referring to table 1.
The composition of table 1 aforementioned patent and technology
Summary of the invention
The object of the present invention is to provide a kind of tensile strength is 590MPa level hot rolling high-chambering steel plate and manufacturing process thereof, this high-chambering steel plate is that a kind of need not need not can make the tensile strength of steel plate reach the above hot rolling high-chambering steel plate of 590MPa by complicated process for cooling after modifier treatment, the hot rolling, this steel plate has good reaming performance, processability, is mainly used in automobile chassis complicated shape component shaping processing.
The present invention is achieved in that
A kind of tensile strength is 590MPa level hot rolling high-chambering steel plate, its chemical ingredients is by weight percentage: C 0.02～0.10, Si 0～1.6, Mn 0.8～2.0, P≤0.035, S≤0.010, Al 0.025～0.060, N≤0.0060, Nb 0～0.10, Ti 0～0.04, Ca 0～0.0050, all the other are Fe and unavoidable impurities.
A kind of tensile strength is that 590MPa level hot rolling high-chambering steel plate manufacturing process is, steel billet is rolled in the austenitic area after 1150～1250 ℃ of heating, and rolling reduction is greater than 80%, 830～900 ℃ of finishing temperatures; Steel plate after the finish to gauge is cooled to 600～750 ℃ with the speed of cooling of 50 ℃/s～100 ℃/s, in air, cooled off for 3～10 seconds with the speed of cooling of 5 ℃/s～15 ℃/s subsequently, steel plate is cooled to 350～500 ℃ and batch with the speed of cooling of 70 ℃/s～150 ℃/s once more subsequently, and air cooling is to room temperature then.
Tensile strength of the present invention be 590MPa level hot rolling high-chambering steel plate as the automobile chassis material, enough intensity must be arranged, but the decline that the intensity of general ferrous materials can be brought forming property after improving usually, as plasticity reduce, hole expansibility reduces.If steel plate has certain plasticity and good hole expansibility when having sufficient intensity, when the shaping processing (particularly minor diameter curved surface flange) of complicated shape component, just can avoid the generation of cracking phenomena.High-chambering steel plate of the present invention is that a kind of need not need not can make the tensile strength of steel plate reach the above hot rolling high-chambering steel plate of 590MPa by complicated process for cooling after modifier treatment, the hot rolling, this steel plate has good reaming performance, forming property, is mainly used in automobile chassis complicated shape component shaping processing.
The effect of each alloying element among the present invention:
C: be used to form enough carbide reinforced phase, to guarantee the intensity rank of steel, C too low strength does not reach requirement, and C is too high unfavorable to welding property and forming property.
The effect of Si:Si in steel has following three:
1) plays the solution strengthening effect, improve the intensity of steel;
2) can play acceleration to ferritic transformation to austenite, austenite is accelerated to ferritic velocity of transformation.
3) stop separating out of Cization thing, avoid the appearance of perlite phase.
But too high Si content makes surface of steel plate produce surface imperfection such as red iron sheet easily.
Mn: be the solution strengthening element, be lower than the undercapacity of 0.8% steel, be higher than 2.0% plasticity of steel is descended.
P, S: be the impurity element in the steel, content should be low more good more.
N: be a kind of strengthening element, can form carbonitride, improve the intensity of steel with Nb, V etc.
Al: be the deoxidant element in the steel, reduce oxide inclusion, 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, it is little that add-on is lower than 0.01% strengthening effect.
Ca: can change the form of sulfide in the steel, improve the plasticity and the toughness of steel plate, help to improve the hole expansibility of steel plate.
The explanation of processing condition among the present invention:
Heating temperature is lower than 1150 ℃, and the microalloy element dissolving is insufficient, fails to make full use of the effect of microalloy element, and intensity reduces.Be higher than 1250 ℃ of easy alligatoring of crystal grain, unfavorable to improving steel plate toughness.
Slab carries out roughing in the crystal boundary area again at austenite, by the recrystallize refine austenite crystal grain behind the rolling deformation, the deflection of steel plate is more than 80%, finishing temperature is controlled at 830～900 ℃ in austenite non-recrystallization district, rolling deformation by the austenite cold zone, the carbonitride precipitation 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 600～750 ℃ with the speed of cooling of 50 ℃/s～100 ℃/s after the finish to gauge, and with the speed of cooling cooling of 5 ℃/s～15 ℃/s 3～10 seconds, steel plate was cooled to 350～500 ℃ and batches with 70 ℃/s～150 ℃/speed of cooling of s subsequently in air.If coiling temperature is lower than 350 ℃, martensite appears in the steel plate microtexture easily, be unfavorable for improving reaming.Batch the back air cooling to room temperature.
Beneficial effect of the present invention:
Hot-rolled high-strength high-chambering steel plate of the present invention has adopted fairly simple composition design, does not use comparatively expensive elements such as Mo, Cr, and cost of alloy is lower; In process of production, adopted simple relatively production technique, on conventional laminar flow cooling preface, increased a segmentation cooling mode after the hot rolling, need not to be easy to produce through as the complicated thermal treatment process that JP2006063394 or JP2006305700 introduced.
High-chambering steel plate according to chemical ingredients of the present invention and fabrication process, have the coupling of high strength and good hole expansibility, especially have very high hole expansibility, make the excellent cold-workability exhibiting of steel plate of the present invention, when making complex-shaped automobile chassis parts, has original advantage.
Embodiment
Embodiment
Table 2 is chemical ingredientss of test steel, and A～G steel is the composition of steel embodiment of the present invention, and the H steel is the comparative steel of JP2006063394.
The chemical ingredients of table 2 embodiment of the invention and comparative example
The test steel is through smelting, forging, rolling, technology controlling and process and gained thickness were the mechanical property of the steel plate of 3mm when table 3 was rolling, the test of mechanical property is undertaken by the GB6397-86 standard, the test of reaming performance is undertaken by JFS T1001-1996 standard, and comparative example is the high-chambering steel plate of JP 2006063394 patents.
The technology and the mechanical property of table 3 test steel
Annotate: embodiment and comparative example tension specimen gauge length are 50mm.
Can obtain from table 3, the tensile strength that the high-chambering steel plate in the embodiment of the invention obtains is more than the 590MPa, and hole expansibility is more than 75%.This steel plate had both had higher intensity, also had good forming property, was specially adapted to the manufacturing of the complicated present situation component of automobile chassis.Technology of the present invention is simple, does not need to pass through the complicated back modifier treatment of rolling, and is easy to implement on production line.
Claims (2)
1. a tensile strength is 590MPa level hot rolling high-chambering steel plate, its chemical ingredients is by weight percentage: C 0.02～0.10, Si 0～1.6, Mn 0.8～2.0, P≤0.035, S≤0.010, Al 0.025～0.060, N≤0.0060, Nb 0～0.10, Ti 0～0.04, Ca 0～0.0050, all the other are Fe and unavoidable impurities.
2. a tensile strength is 590MPa level hot rolling high-chambering steel plate manufacturing process, and it is characterized in that: steel billet is rolled in the austenitic area after 1150～1250 ℃ of heating, and rolling reduction is greater than 80%, 830～900 ℃ of finishing temperatures; Steel plate after the finish to gauge is cooled to 600～750 ℃ with the speed of cooling of 50 ℃/s～100 ℃/s, in air, cooled off for 3～10 seconds with the speed of cooling of 5 ℃/s～15 ℃/s subsequently, steel plate is cooled to 350～500 ℃ and batch with the speed of cooling of 70 ℃/s～150 ℃/s once more subsequently, and air cooling is to room temperature then.
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| CN102534408A (en) * | 2012-02-01 | 2012-07-04 | 河北钢铁股份有限公司邯郸分公司 | X80 pipeline steel coil with low cost and high toughness and production method thereof |
| CN102650017A (en) * | 2012-05-25 | 2012-08-29 | 宝山钢铁股份有限公司 | Hot-rolled steel plate and manufacturing method thereof |
| CN103602890A (en) * | 2013-11-29 | 2014-02-26 | 宝山钢铁股份有限公司 | High-hole-expansion-ratio steel plate with tensile strength of 540 MPa and manufacturing process thereof |
| CN104060163A (en) * | 2013-09-12 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolled sheet steel for cold forming and making method thereof |
| CN104220619A (en) * | 2012-04-12 | 2014-12-17 | 杰富意钢铁株式会社 | Hot-rolled steel plate for square steel tube for use as building structural member and process for producing same |
| CN104988386A (en) * | 2015-06-19 | 2015-10-21 | 唐山钢铁集团有限责任公司 | Method for producing high-hole-expansion-rate steel 420L for automotive frame |
| CN105220065A (en) * | 2015-10-16 | 2016-01-06 | 宝山钢铁股份有限公司 | A kind of high hole expansibility low yield strength ratio hot-rolled high-strength steel plate and manufacture method thereof |
| CN105821301A (en) * | 2016-04-21 | 2016-08-03 | 河北钢铁股份有限公司邯郸分公司 | 800MPa-level hot-rolled high strength chambering steel and production method thereof |
| CN106399830A (en) * | 2016-10-14 | 2017-02-15 | 武汉钢铁股份有限公司 | High hole expanding steel with stable hole expanding performance and production method thereof |
| CN107099739A (en) * | 2017-06-14 | 2017-08-29 | 唐山钢铁集团有限责任公司 | The inexpensive high-chambering steel plate of 600MPa grades of tensile strength and its production method |
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| CN103602890B (en) * | 2013-11-29 | 2016-08-24 | 宝山钢铁股份有限公司 | A kind of tensile strength 540MPa level high-chambering steel plate and manufacture method thereof |
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Application publication date: 20101229 |