CN103667880B - High hole expansion steel plate with tensile strength of 440MPa and manufacturing method thereof - Google Patents
High hole expansion steel plate with tensile strength of 440MPa and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a high hole expansion steel plate with tensile strength of 440MPa and a manufacturing method thereof. The high hole expansion steel plate comprises the following chemical components by weight percent: 0.05-0.1% of C, 0.1-0.6% of Si, 0.9-1.8% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S, 0.015-0.060% of Al, less than 0.0050% of Ca, and the balance of Fe and inevitable impurities, wherein ([C]*[Mn]) is less than or equal to 0.1, ([P]+10[S]) is less than or equal to 0.04, the thickness of the obtained steel plate is 1.6-6.0 mm, the arithmetic product of the tensile strength TS and the hole expansion rate lambda of the steel plate is greater than or equal to 44000MPa%, and the requirement for steel used for a chassis or a complex stamping part in the automobile industry is met.
Description
Technical field
The present invention relates to high reaming steel, particularly to a kind of tensile strength 440mpa level high-chambering steel plate and its manufacturer
Method, product has good reaming and flanging forming characteristic.
Background technology
Hot rolling and hot rolling acid-cleaning plate are widely used in automobile chassis, wheel and body structure part, and they account for automobile steel
28% about.Intensity and the rigidity of part can be improved by auto parts flange and the design of local reaming shape, reach automobile steel
The thinning and light-weighted purpose of plate.The reaming performance of steel plate is relevant with the composition of steel plate, intensity and structural homogenity, tradition
440mpa steel plate has the hole expansibility of carbon manganese Solid Solution Strengthened Steel and low-alloy precipitation strength steel between 50～70%.Set with automobile
The requirement to chassis structure for the meter increasingly improves, and part forming is more complicated, and the flange to steel plate and reaming performance requirement have carried
Height, conventional carbon manganese Solid Solution Strengthened Steel and low-alloy precipitation strength steel plates of steel structure difficulty or ease meet automobile chassis, cantilever part forming
Require, high reaming steel has become one of important kind for autobody sheet.
Chinese patent cn101353757 adopts low-carbon (LC) composition to produce the reaming steel of tensile strength 440mpa, due to adopting 600
DEG C coiling temperature, for carbon manganese steel hot rolled plate, is commonly present banded structure, leads to steel plate hole expansibility to decline.Add a small amount of niobium titanium
Alloy is conducive to improving intensity, increases production cost simultaneously.
Patent wo200928515 adopts c, si, mn to add a small amount of nb, ti alloying element, can produce tensile strength and exist
More than 490mpa reaming steel, hot rolling must adopt two-part section cooling mode, can be cold compared with accurately simulating two-part in laboratory
But control, obtain good result of the test, but in hot rolling produces, in hot rolling, strip speed changes greatly, cannot measure again
The steel billet temperature of air cooling section, using two-stage cooling model cootrol section cooling, the fluctuation of steel plate actual temperature is big, is easily caused coil of strip
Head, middle and end performance inconsistency is very big.
Japan Patent jp2006063394 discloses a kind of hot rolling high-chambering steel, carbon content 0.20～0.48%, and its tension is strong
Degree is also >=440mpa, but its hole expansibility is also performed to 640 DEG C of annealing after being only >=70%, and hot rolling.
Content of the invention
It is an object of the invention to provide a kind of tensile strength 440mpa level hot rolling high-chambering steel plate and its manufacture method, obtain
The armor plate strength obtaining and hole expansibility product tsx λ >=44000mpa%, meet auto industry chassis and complicated stamping steel demand.
For reaching above-mentioned purpose, the technical scheme is that
A kind of tensile strength 440mpa level high-chambering steel plate, its chemical component weight percentage is: c:0.05～0.1%,
Si:0.1～0.6%, mn:0.9～1.8%, p≤0.02%, s≤0.005%, al:0.015～0.060%, ca ＜ 0.0050%, its
Remaining for fe with inevitable impurity；Wherein, ([c] × [mn])≤0.1, ([p]+10 [s])≤0.04, armor plate strength and reaming
Rate product tsx λ >=44000mpa%.
The high-chambering steel plate thickness of the present invention is 1.6～6.0mm.
In present component design:
C: for forming carbide reinforced enough phase, to ensure the intensity rank of steel, c too low-intensity does not reach requirement, c mistake
High carbide precipitate particle is unfavorable for greatly steel plate reaming performance.Additionally, for carbon manganese steel, the carbon in steel and manganese interact,
Pearlitic structrure is formed and distribution has certain impact, carbon manganese content is too high, and [c] * [mn] product is big, is also easy to produce pearly-lustre body phase
Thick and pearlite banded structure, the coupling of carbon manganese content is controlled the present invention it is desirable to ([c] * [mn])≤0.1.
Si: play solution strengthening effect in carbon manganese steel, improve the elongation percentage of steel plate while improving intensity, improve steel plate
Formability, suitable silicone content should be greater than 0.3%, plus the negative effect of silicon is that silicon height easily makes surface of steel plate produce red iron sheet
Etc. surface defect it is impossible to targeted customer's great surface quality requires.
Mn: it is solution strengthening element, not enough less than the intensity of 0.9% steel, crossing high Mn content will increase pearly-lustre phase fraction,
High Mn content leads to slab manganese component segregation, is the one of the main reasons of Banded Structure of Steel Plate, and banded structure can deteriorate steel plate
Reaming performance.In the present invention, the optimal manganese content of manganese should be below 1.5%.
P: phosphorus is the impurity element in steel, and content should be more low better, crosses high phosphorus amount and intensity can be caused higher, continuous casting mistake simultaneously
In journey, phosphorus can aggravate slab component segregation, leads to uneven microstructure, needs to control, application claims p≤0.02%.
S: sulphur is the impurity element in steel, and s easily forms mns in steel, and in steel, sulfide quantity and form directly affect steel
The hole expansibility of plate, s have to be lower than 0.005%, preferably lower than 0.003%.The tramp element quantity and form reaming performance to steel plate
Have a great impact, particularly strip sulphide inculsion is easily caused crackle in deformation and occurs it is desirable to phosphorus sulphur overall control exists
([p]+10[s])≤0.04.
Al: be the deoxidant element in steel, the oxide in minimizing steel is mingled with, pure steel, is conducive to improving the one-tenth of steel plate
Shape performance.Al:0.02～0.06%, unsuitable too low, but when too high, affect continuous casting.
Ca: the form of sulfide in steel can be changed, improve plasticity and the toughness of steel plate, to molten steel Calcium treatment of the present invention, and
Control ca ＜ 0.0050%.
The manufacture method of the tensile strength 440mpa level high-chambering steel plate of the present invention, comprises the following steps:
1) smelt, cast
Smelted, be casting continuously to form slab by following compositions, its chemical component weight percentage is: c0.05～0.1%, si:0.1～
0.6%th, mn:0.9～1.8%, p≤0.02%, s≤0.005%, al:0.015～0.060%, ca ＜ 0.0050%, remaining be fe and
Inevitably impurity；([c] × [mn])≤0.1, ([p]+10 [s])≤0.04；Wherein, using lf stove desulfurization process, molten steel
Sulfur content is less than 0.003%；
2) hot rolling
1180～1250 DEG C of continuous casting steel billet heating-up temperature, 840～880 DEG C of finishing temperature, 450～550 DEG C of coiling temperature；
3) cool down
After the completion of slab finish rolling, using one-part form routine laminar flow type of cooling cooling, cooling metal sheets are to after 450～550 DEG C
Batch, wherein, cooling velocity is more than 30 DEG C/s；
4) pickling
Naturally cool to 50 DEG C of hot rolling below coil of strips and pass through the iron oxide that pickling unit removes steel plate in hot hydrochloric acid solution
Skin, pickled plate applies oil processing after rinsing, extract, drying.
In manufacture method of the present invention, molten steel passes through converter smelting, and lf stove is processed it is ensured that s content is less than 0.003%, goes forward side by side
Row ca process improves oxide morphology, and in hot rolling technology, heating-up temperature is 1180～1250 DEG C, and finishing temperature is 820～880
DEG C, using the conventional one-part form type of cooling, with the cooling velocity cooling more than 30 DEG C/s, steel plate is in 450～550 DEG C of temperature last volumes
Take, coil of strip is air cooled to room temperature after batching.Coiler plate temperature is too high, leads to armor plate strength to decline, meanwhile, tissue odds also result in
Steel plate hole expansibility reduces.Coiling temperature is too low, causes armor plate strength to raise, elongation percentage declines.Preferably coiling temperature scope is 480
～540 DEG C.
Steel roll temperature before pickling is less than 60 DEG C, and preferably lower than 50 DEG C, steel roll temperature is too high, is easily caused surface of steel plate waist folding
Defect.Pass through after uncoiling of steel plate to heat the iron scale that hydrochloric acid solution (70～85 DEG C of Acidwash solution temperature) removes surface of steel plate,
After pickling, steel plate, through water rinsing, drying, batches after applying antirust oil.
This hot-rolled high-strength high-chambering steel plate that the present invention provides, tensile strength reaches 440mpa, and hole expansibility is more than
100%.Composition does not contain nb, ti, need not be heat-treated, reduces cost；Without complex control cooling technology after hot rolling, use general laminar flow
Cooling technique achieves that it is easy to produce.This steel plate has good reaming performance, forming property, cold-forming property, main use
In automobile chassis Irregular Shaped Parts forming.
Hole expansibility evaluation method, calculates hole expansibility (λ: unit is %) in the steps below.Take hot rolling or the acid of 150 × 150mm
Wash on steel plate, as initial stage aperture (d [1]), open the punching of diameter 10mm, expand this punching using 60 ° of circular cone drift of drift angle.
Aperture (d [2]) during the crackle insertion thickness of slab that mensure Punches produce, calculates hole expansibility by following formula.In the present invention, λ
It is qualified for more than 85%.
Hole expansibility (λ)=[(d [2]-d [1])/d [1]] × 100%
The metallographic structure of the high reaming steel of tensile strength 440mpa level of the present invention is mainly ferrite, and bayesian body burden is micro.
That realizes high hole expandability mainly relies on following several respects:
1st, adopt lf stove desulfurization process, reduction molten steel s content, and then reduction steel plate is mingled with quantity, and by ca process,
So that the mns of strip is mingled with and is converted into spherical cas and is mingled with, reduce the nonmetal inclusion that mns is representative no successional to matrix
Destroy.
2nd, rational hot rolling technology controls, and adopts suitable c, mn content and ratio, can make materials microstructure uniformly,
Prevent banded structure and center segregation, slow down the sensitiveness that steel plate ftractures during local deformation.
Brief description
Fig. 1 is the typical metallographic structure photo of the embodiment of the present invention 1 steel plate.Even tissue, segregation-free band and banded structure.
Specific embodiment
With reference to embodiment and accompanying drawing the present invention will be further described book.
Table 1 is the chemical composition of embodiment of the present invention steel, and table 2 show the mechanical property of embodiment of the present invention steel.
Embodiment of the present invention sample passes through converter smelting, lf stove desulfurization process, and continuous casting, continuous casting steel billet heating-up temperature 1180～
1250 DEG C, finishing temperature is 820～880 DEG C, 450～550 DEG C of coiling temperature, and hot rolled plate is with cold more than the cooling velocity of 30 DEG C/s
But, steel plate batches at a temperature of 450～550 DEG C, and coil of strip is air cooled to room temperature after batching.Comparative example 1, comparative example 2 steel are same level
Commercial material.
The typical metallographic structure of steel plate is as shown in figure 1, be organized as uniform ferrite.
Table 1 unit: percentage by weight
| c | si | mn | p | s | al | nb | ti | ca | |
| Embodiment 1 | 0.05 | 0.20 | 1.70 | 0.018 | 0.0010 | 0.055 | 0.003 | ||
| Embodiment 2 | 0.06 | 0.60 | 1.25 | 0.010 | 0.0030 | 0.021 | 0.0015 | ||
| Embodiment 3 | 0.07 | 0.50 | 1.40 | 0.015 | 0.0012 | 0.030 | 0.002 | ||
| Embodiment 4 | 0.09 | 0.15 | 1.00 | 0.007 | 0.0032 | 0.045 | 0.003 | ||
| Comparative example 1 | 0.06 | 0.03 | 0.66 | 0.011 | 0.0040 | 0.040 | 0.017 | 0.001 | |
| Comparative example 2 | 0.08 | 0.10 | 1.20 | 0.014 | 0.0040 | 0.022 | 0.006 | 0.003 | 0.003 |
Table 2
| Slab heating temperature DEG C | Finishing temperature DEG C | Coiling temperature DEG C | |
| Embodiment 1 | 1210 | 850 | 480 |
| Embodiment 2 | 1195 | 865 | 540 |
| Embodiment 3 | 1240 | 880 | 520 |
| Embodiment 4 | 1220 | 845 | 505 |
Table 3
In sum, steel of the present invention carries out match control, the coiling technique of cooperation low temperature to carbon manganese content, can obtain carbonization
Thing is tiny, the single ferritic structure of even tissue.Controlled and Calcium treatment by sulphur phosphorus total inclusion content, to the amount of inclusions and shape
State is managed, and improves the reaming performance of steel plate.
Claims (2)
1. a kind of tensile strength 440mpa level high-chambering steel plate, its chemical component weight percentage is: c:0.05～0.1%, si:
0.1～0.6%, mn:0.9～1.8%, p≤0.02%, s≤0.005%, al:0.015～0.060%, ca ＜ 0.0050%,
Remaining is fe and inevitable impurity；Wherein, ([c] × [mn])≤0.1；([p]+10[s])≤0.04；The steel plate obtaining is strong
Degree and hole expansibility product tsx λ >=44000mpa%；The metallographic structure of this steel plate is mainly ferrite, containing micro bainite；
The manufacture method of described high-chambering steel plate, comprises the following steps:
1) smelt, cast
Smelted, be casting continuously to form slab by described chemical composition；Wherein, using lf stove desulfurization process, molten steel sulfur content is less than
0.003%；
2) hot rolling
1180～1250 DEG C of continuous casting steel billet heating-up temperature, 840～880 DEG C of finishing temperature, 505～550 DEG C of coiling temperature；
3) cool down
After the completion of slab finish rolling, using the cooling of the conventional laminar flow type of cooling, cooling metal sheets batch to after 505～550 DEG C, wherein,
Cooling velocity is more than 30 DEG C/s；
4) pickling
Naturally cool to 50 DEG C of hot rolling below coil of strips and pass through the iron scale that pickling unit removes steel plate in hot hydrochloric acid solution, acid
Wash steel plate and apply oil processing after rinsing, extract, drying.
2. tensile strength 440mpa level high-chambering steel plate as claimed in claim 1, is characterized in that, described high-chambering steel plate thickness
For 1.6～6.0mm.
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| 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 |
| CN108624818A (en) * | 2017-03-24 | 2018-10-09 | 宝山钢铁股份有限公司 | 400-500MPa grades high uniform elongation hot continuous-milling steel plate and its manufacturing method |
| CN109487153B (en) * | 2017-09-11 | 2021-01-08 | 上海梅山钢铁股份有限公司 | High-reaming hot-rolled pickled steel plate with tensile strength of 440MPa |
| CN107829028A (en) * | 2017-11-06 | 2018-03-23 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of high reaming steel of the economical great surface quality of 450MPa levels and preparation method thereof |
| CN107747042A (en) * | 2017-11-06 | 2018-03-02 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of high reaming steel of the economical great surface quality of 690MPa levels and preparation method thereof |
| CN107868909A (en) * | 2017-11-06 | 2018-04-03 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of high reaming steel of the economical great surface quality of 580MPa levels and preparation method thereof |
| CN112522574A (en) * | 2019-09-19 | 2021-03-19 | 宝山钢铁股份有限公司 | Thin-strip continuous casting high-reaming steel and production 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 |
| CN116716541A (en) * | 2023-05-31 | 2023-09-08 | 武汉钢铁有限公司 | 400 MPa-grade thin-specification high-reaming acid-washing automobile steel with good surface quality and production method |
| CN116640995A (en) * | 2023-05-31 | 2023-08-25 | 武汉钢铁有限公司 | Thin-specification high-precision 440 MPa-grade high-reaming acid-washing automobile steel and production method thereof |
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| CN101353757A (en) * | 2007-07-23 | 2009-01-28 | 宝山钢铁股份有限公司 | Hot rolling high reaming steel plate having 440MPa grade of tensile strength and manufacturing method thereof |
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| JP3219510B2 (en) * | 1992-12-02 | 2001-10-15 | 株式会社神戸製鋼所 | High strength hot rolled steel sheet with excellent stretch flangeability |
| JP4116901B2 (en) * | 2003-02-20 | 2008-07-09 | 新日本製鐵株式会社 | Burring high strength thin steel sheet and method for producing the same |
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| CN101906567A (en) * | 2005-03-28 | 2010-12-08 | 株式会社神户制钢所 | The high tensile hot rolled steel sheet of excellent in bore expanding workability and manufacture method thereof |
| CN101353757A (en) * | 2007-07-23 | 2009-01-28 | 宝山钢铁股份有限公司 | Hot rolling high reaming steel plate having 440MPa grade of tensile strength and manufacturing method thereof |
| CN101643880A (en) * | 2009-08-31 | 2010-02-10 | 江苏省沙钢钢铁研究院有限公司 | High tensile strength hot rolled ferrite bainite dual phase steel and preparation method thereof |
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Effective date of registration: 20180914 Address after: 524072 building 12-15, building 46, Renmin Road, Zhanjiang, Guangdong Co-patentee after: Baoshan Iron & Steel Co., Ltd. Patentee after: Baosteel Zhanjiang Iron & Steel Co., Ltd. Address before: 201900 Fujin Road, Baoshan District, Shanghai 885 Patentee before: Baoshan Iron & Steel Co., Ltd. |