CN103572164B - A kind of hot rolling acid-cleaning plate and production method thereof - Google Patents
A kind of hot rolling acid-cleaning plate and production method thereof Download PDFInfo
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Abstract
A kind of hot rolling acid-cleaning plate and production method thereof, the production method of this hot rolling acid-cleaning plate comprises: continuous casting of molten steel is obtained slab, by after described heating of plate blank successively through roughing and finish rolling to obtain hot-rolled sheet, acquisition hot rolled coil is batched by after described hot-rolled sheet cooling, described hot rolled coil is obtained finished product hot rolling acid-cleaning plate after overpickling, wherein, the chemical composition mass percent of described slab is: C:0.08-0.12, Si≤0.15, Mn:1.20-1.40, P≤0.02, S≤0.015, Cr:0.60-0.70, Als≤0.015, and all the other are Fe and inevitable impurity.This hot rolling acid-cleaning plate excellent property, has that intensity is high, yield tensile ratio is low, good welding performance, processability are good and the advantage such as surface quality is good.
Description
Technical field
The present invention relates to steel rolling field, particularly, relate to a kind of hot rolling acid-cleaning plate and production method thereof.
Background technology
Hot rolling acid-cleaning plate is with high-quality latten for raw material, remove that zone of oxidation, trimming, finishing etc. make through pickling unit, and its surface quality and service requirements, between hot-rolled sheet and cold-reduced sheet, are the desirable substitute products of part hot-rolled sheet and cold-reduced sheet.Along with the development of automotive industry, the demand of automobile industry to the good hot rolling acid-cleaning plate of impact briquetting sharply increases, and these hot rolling acid-cleaning plates are mainly used in processing automobile structural part.The yield tensile ratio of product made from steel is the key index of exosyndrome material impact briquetting performance, and for improving the utilising efficiency of hot rolling acid-cleaning plate, automobile manufacture industry proposes the demand parameter of the hot rolling acid-cleaning plate of low yield strength ratio.Exist in the prior art and add appropriate B element to obtain the method for the lower hot rolling acid-cleaning plate of yield tensile ratio, utilize the method can obtain the acid-cleaning plate of yield tensile ratio below 0.76, but B element price is higher, add the cost of hot rolling acid-cleaning plate, even if the more important thing is that adding B element also cannot make the yield tensile ratio of hot rolling acid-cleaning plate reach less than 0.7.
Summary of the invention
The object of this invention is to provide a kind of hot rolling acid-cleaning plate and production method thereof, the yield tensile ratio of this hot rolling acid-cleaning plate is lower, can reach less than 0.7, and manufacture craft is simple and cost is low.
To achieve these goals, the invention provides a kind of production method of hot rolling acid-cleaning plate, the method comprises: continuous casting of molten steel is obtained slab, by after described heating of plate blank successively through roughing and finish rolling to obtain hot-rolled sheet, acquisition hot rolled coil is batched by after described hot-rolled sheet cooling, described hot rolled coil is obtained finished product hot rolling acid-cleaning plate after overpickling, wherein, the chemical composition mass percent of described slab is: C:0.08-0.12, Si≤0.15, Mn:1.20-1.40, P≤0.02, S≤0.015, Cr:0.60-0.70, Als≤0.015, and all the other are Fe.
Preferably, the chemical composition mass percent of described slab is: C:0.08-0.12, Si≤0.15, Mn:1.20-1.40, P≤0.02, S≤0.015, Cr:0.64-0.66, Als≤0.015, and all the other are Fe.
Preferably, to described slab heat make the temperature of described slab reach 1200 DEG C-1240 DEG C after successively through roughing and finish rolling to obtain hot-rolled sheet.
Preferably, the finishing temperature of carrying out finish rolling to described slab is 840 DEG C-880 DEG C.
Preferably, the coiling temperature of described hot-rolled sheet is 640 DEG C-680 DEG C.
Preferably, the smooth power of pickling when carrying out pickling to described hot rolled coil is 50t-200t, and pickling speed is 50-70m/min.
Present invention also offers a kind of hot rolling acid-cleaning plate, wherein, this hot rolling acid-cleaning plate adopts the production method of above-mentioned hot rolling acid-cleaning plate to make.
Preferably, the thickness of this hot rolling acid-cleaning plate is 1.8mm-6.0mm.
Preferably, the metallographic structure of this hot rolling acid-cleaning plate is ferrite and pearlite tissue.
Preferably, the yield strength of this hot rolling acid-cleaning plate is 330MPa-380MPa, and tensile strength >=490MPa, unit elongation >=30%, yield tensile ratio is below 0.7.
In the production method of hot rolling acid-cleaning plate of the present invention, the mass percent of each chemical element in the slab obtained by control continuous casting, especially, by adding appropriate Cr element, make the final tissue of the hot rolling acid-cleaning plate obtained suitably tiny and even, thus obtain the lower hot rolling acid-cleaning plate of yield tensile ratio.Hot rolling acid-cleaning plate yield tensile ratio according to the present invention is lower, stable mechanical property and ductility is good, is suitable for impact briquetting.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Embodiment
Below the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
Production method according to hot rolling acid-cleaning plate of the present invention comprises: continuous casting of molten steel is obtained slab, by after described heating of plate blank successively through roughing and finish rolling to obtain hot-rolled sheet, acquisition hot rolled coil is batched by after described hot-rolled sheet cooling, described hot rolled coil is obtained finished product hot rolling acid-cleaning plate after overpickling, wherein, the chemical composition mass percent of described slab is: C:0.08-0.12, Si≤0.15, Mn:1.20-1.40, P≤0.02, S≤0.015, Cr:0.60-0.70, Als(dissolved aluminum)≤0.015, all the other are Fe and some inevitable impurity.
In the production method of this hot rolling acid-cleaning plate, the mass percent of each chemical element in the slab obtained by control continuous casting, especially, by adding appropriate Cr element, make the final tissue of the hot rolling acid-cleaning plate obtained suitably tiny and even, thus obtain the lower hot rolling acid-cleaning plate of yield tensile ratio.
Particularly, in soft steel, add appropriate Cr element can make the Ar3 temperature of steel (austenite starts to separate out ferritic temperature) reduce, thus avoid in steel plate, produce thick grain structure, and, Cr element can make carbide assemble, the netted precipitate of crystal boundary is obviously reduced, thus make the final tissue of steel plate suitably tiny and evenly, and avoid surface of steel plate to occur mixed crystal phenomenon, improve the ductility of steel plate, reduce steel plate anisotropy, yield tensile ratio and Cold Brittleness Transition Temperature, and, because the price of Cr element is lower than the price of B element, the method also makes the production cost of hot rolling acid-cleaning plate reduce.
Preferably, the chemical composition mass percent of described slab is: C:0.08-0.12, Si≤0.15, Mn:1.20-1.40, P≤0.02, S≤0.015, Cr:0.64-0.66, Als≤0.015, all the other are Fe and inevitable impurity, when the mass percent of Cr element is controlled at 0.64-0.66, the ductility of obtained hot rolling acid-cleaning plate is better, and yield tensile ratio is also lower.
The continuous casting process that continuous casting can adopt this area conventional is carried out to molten steel, such as, the ladle filling molten steel is winched to continuous caster top, molten steel flows in tundish by the mouth of a river of ladle bottom, molten steel is cooled and solidified progressively, when molten steel starts to enter crystallizer, clogs at crystallizer hypomere dummy bar, strand adopts conventional pulling rate to pull out, and the slab thickness that continuous casting obtains can be 200mm-250mm.
In addition, in the preferred case, heating slab makes the temperature of slab reach 1200 DEG C-1240 DEG C, namely slab is carried out to the thermal treatment of long period at 1200 DEG C-1240 DEG C, with the Heating temperature making slab reach 1200 DEG C-1240 DEG C, thus ensure alloying element (>=140min) all solid solutions within a certain period of time.
The slab of coming out of the stove from process furnace enters roughing mill after dephosphorize by high pressure water, the thickness of the intermediate blank after roughing can be 35mm-38mm, then entering finishing mill, the thickness of the hot-rolled sheet obtained after finish rolling can be 1.8mm-6.0mm, to the temperature that the temperature out of slab rough rolling and the start rolling temperature of finish rolling can adopt this area conventional, the finishing temperature of slab being carried out to finish rolling is preferably 840 DEG C-880 DEG C, to ensure to carry out austenitic area rolling (namely rolling temperature is at more than Ar3) to slab, mixed grain structure is avoided to produce, the weave construction of the hot-rolled sheet that impact is obtained.
The conventional hot continuous rolling laminar cooling system in this area can be adopted to cool hot-rolled sheet, and, it is the important factor of the physicals of the hot rolling acid-cleaning plate that impact obtains due to coiling temperature, therefore, by controlled cooling model speed, ensure that the coiling temperature of hot-rolled sheet is preferably 640 DEG C-680 DEG C, austenite can be made so to be fully converted into ferrite.
Hot-rolled sheet is batched after acquisition hot rolled coil through reeling machine, pickling is carried out to hot rolled coil, to remove the oxide skin on surface, preferably, the smooth power of pickling when carrying out pickling to hot rolled coil is 50-200t, and pickling speed is 50-70m/min, and the size of the smooth power of pickling is determined by the surfacing situation of hot rolled coil, oxide skin is removed clean to select suitable pickling speed then can ensure, and ensures that pickle solution does not react with the iron-based body in oxide skin and produces overpickling phenomenon.Further, preferably, pickling terminates rear to hot rolled coil painting oil treatment, gets rusty to prevent hot rolled coil.
On the other hand, present invention also offers a kind of hot rolling acid-cleaning plate obtained by aforesaid method.Preferably, the thickness of this hot rolling acid-cleaning plate is 1.8mm-6.0mm, and this hot rolling acid-cleaning plate be organized as ferrite and pearlite tissue, the yield strength of this hot rolling acid-cleaning plate is 330MPa-380MPa, tensile strength >=490MPa, unit elongation >=30%, yield tensile ratio is below 0.7.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, within the scope of technical conceive of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.Each concrete technical characteristic in addition described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode.In addition, also can carry out arbitrary combination between various different embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Embodiment
The present invention is further illustrated for following embodiment, but therefore do not limit the present invention.
In following embodiment and comparative example:
The measuring method of yield strength: GB/T 228-2002 metallic substance tensile testing at ambient temperature.
The measuring method of tensile strength: GB/T 228-2002 metallic substance tensile testing at ambient temperature.
The measuring method of unit elongation: GB/T 228-2002 metallic substance tensile testing at ambient temperature.
Embodiment 1-5
Respectively by continuous casting of molten steel to obtain slab N1-N5, slab N1-N5 comprises C, Si, Mn, P, S, Cr, Als and Fe and inevitable impurity, in slab N1-N5, the mass percent of principal element is as shown in table 1, and the width of slab is 1160mm, and the thickness of slab is 200mm; Heat slab N1-N5 respectively, the temperature that slab N1-N5 can reach after heating is respectively as shown in the Ta in table 2; Then slab N1-N5 is rolled into intermediate blank through the roughing of two reversing rougher 6 passages, the width of intermediate blank is 1160mm, the thickness of intermediate blank is 35mm, this intermediate blank enters in six frame finishing train that finish rolling is to obtain hot-rolled sheet after Coil Box insulation, and the finishing temperature of finish rolling is respectively as shown in the Tb in table 2; Batch acquisition hot rolled coil after hot-rolled sheet cooling finish rolling obtained respectively again, the temperature of batching hot-rolled sheet is respectively as shown in the Tc in table 2; Finally, carry out pickling respectively to hot rolled coil, the smooth power of pickling during pickling is respectively as shown in the F in table 2, and pickling speed is respectively as shown in the v in table 2; And the thickness of final obtained hot rolling acid-cleaning plate is as shown in the H in table 2.
Table 1
Table 2
| Ta（℃） | Tb（℃） | Tc（℃） | F（t） | v（m/min） | H（mm） | |
| Embodiment 1 | 1240 | 880 | 680 | 200 | 70 | 6.0 |
| Embodiment 2 | 1220 | 860 | 660 | 150 | 60 | 4.0 |
| Embodiment 3 | 1200 | 840 | 640 | 100 | 50 | 1.8 |
| Embodiment 4 | 1240 | 880 | 680 | 200 | 70 | 4.0 |
| Embodiment 5 | 1200 | 840 | 640 | 50 | 50 | 1.8 |
Comparative example 1-3
Respectively by continuous casting of molten steel to obtain slab N6-N8, slab N6-N7 comprises C, Si, Mn, P, S, Cr, Als and Fe and inevitable impurity, slab N8 comprises C, Si, Mn, P, S, Als and Fe and inevitable impurity, in slab N6-N8, the mass percent of principal element is as shown in table 3, the width of slab is 1160mm, and the thickness of slab is 200mm; Heat slab N6-N8 respectively, the temperature that slab N6-N8 can reach after heating is respectively as shown in the Ta in table 4; Then slab N6-N8 is rolled into intermediate blank through the roughing of two reversing rougher 6 passages, the width of intermediate blank is 1160mm, the thickness of intermediate blank is 35mm, this intermediate blank enters in six frame finishing train that finish rolling is to obtain hot-rolled sheet after Coil Box insulation, and the finishing temperature of finish rolling is respectively as shown in the Tb in table 4; Batch acquisition hot rolled coil after hot-rolled sheet cooling finish rolling obtained respectively again, the temperature of batching hot-rolled sheet is respectively as shown in the Tc in table 4; Finally, carry out pickling respectively to hot rolled coil, the smooth power of pickling during pickling is respectively as shown in the F in table 4, and pickling speed is respectively as shown in the v in table 4; And the thickness of final obtained hot rolling acid-cleaning plate is as shown in the H in table 4.
Table 3
Table 4
| Ta（℃） | Tb（℃） | Tc（℃） | F（t） | v（m/min） | H（mm） | |
| Comparative example 1 | 1230 | 900 | 720 | 250 | 80 | 6.0 |
| Comparative example 2 | 1220 | 840 | 680 | 50 | 40 | 4.0 |
| Comparative example 3 | 1220 | 860 | 660 | 150 | 60 | 4.0 |
Carry out performance test to the hot rolling acid-cleaning plate in embodiment 1-5 and comparative example 1-3 respectively according to national standard, test result is as shown in table 5.
Table 5
| Yield strength (MPa) | Tensile strength (Mpa) | Unit elongation (%) | Take intensity (ratio) | |
| Embodiment 1 | 360 | 530 | 36 | 0.679 |
| Embodiment 2 | 335 | 515 | 37 | 0.650 |
| Embodiment 3 | 350 | 520 | 34.5 | 0.673 |
| Embodiment 4 | 335 | 520 | 36.5 | 0.644 |
| Embodiment 5 | 330 | 510 | 35.5 | 0.647 |
| Comparative example 1 | 375 | 530 | 33.5 | 0.707 |
| Comparative example 2 | 345 | 490 | 32.5 | 0.704 |
| Comparative example 3 | 390 | 470 | 29.5 | 0.830 |
As can be seen from Table 5, use the hot rolling acid-cleaning plate plate of the production method manufacture of hot rolling acid-cleaning plate of the present invention to have higher tensile strength and unit elongation, and yield strength all can reach less than 0.7, impact briquetting performance is good.Embodiment 1-5 and comparative example 3 are compared and can find out, the interpolation of Cr element makes the unit elongation of hot rolling acid-cleaning plate greatly improve and makes yield tensile ratio greatly lower, and, can be found out by comparative example 1-5, when the mass percent of Cr element is 0.64-0.66, to the raising best results of hot rolling acid-cleaning plate performance.
The production method of hot rolling acid-cleaning plate of the present invention by adding the addition of C r element in soft steel, the yield tensile ratio of the hot rolling acid-cleaning plate produced is made to be reduced to less than 0.7, improve the impact briquetting performance of this hot rolling acid-cleaning plate, because Cr price is lower, the cost of the hot rolling acid-cleaning plate producing low yield strength ratio is reduced, further, the method technique controlling difficulty is less and workable.The weave construction of hot rolling acid-cleaning plate using the method to obtain is suitably tiny cuts evenly, lessly occurs mixed crystal phenomenon, and ductility is better, and the mechanical property of steel plate produced is stable and anisotropy is little.
Claims (6)
1. the production method of a hot rolling acid-cleaning plate, the method comprises: continuous casting of molten steel is obtained slab, by after described heating of plate blank successively through roughing, Coil Box and finish rolling are to obtain hot-rolled sheet, acquisition hot rolled coil is batched by after described hot-rolled sheet cooling, described hot rolled coil is obtained finished product hot rolling acid-cleaning plate after overpickling, it is characterized in that, the chemical composition mass percent of described slab is: C:0.08-0.12, Si≤0.15, Mn:1.20-1.40, P≤0.02, S≤0.015, Cr:0.64-0.66, Als≤0.015, all the other are Fe, to described slab heat make the temperature of described slab reach 1200 DEG C-1240 DEG C after successively through roughing, Coil Box and finish rolling are to obtain hot-rolled sheet, and be 840 DEG C-880 DEG C to the finishing temperature that described slab carries out finish rolling, the coiling temperature of described hot-rolled sheet is 640 DEG C-680 DEG C.
2. the production method of hot rolling acid-cleaning plate according to claim 1, wherein, the smooth power of pickling when carrying out pickling to described hot rolled coil is 50-200t, and pickling speed is 50-70m/min.
3. a hot rolling acid-cleaning plate, is characterized in that, this hot rolling acid-cleaning plate adopts the production method of the hot rolling acid-cleaning plate described in above-mentioned any one to make.
4. hot rolling acid-cleaning plate according to claim 3, wherein, the thickness of this hot rolling acid-cleaning plate is 1.8mm-6.0mm.
5. hot rolling acid-cleaning plate according to claim 4, wherein, the metallographic structure of this hot rolling acid-cleaning plate is ferrite and pearlite tissue.
6. according to the hot rolling acid-cleaning plate in claim 3-5 described in any one, wherein, the yield strength of this hot rolling acid-cleaning plate is 330MPa-380MPa, and tensile strength >=490MPa, unit elongation >=30%, yield tensile ratio is below 0.70.
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| CN108817080A (en) * | 2018-04-03 | 2018-11-16 | 宁波钢铁有限公司 | A kind of method that hot rolling acid-cleaning is controlled with steel surface quality |
| CN108517460A (en) * | 2018-04-04 | 2018-09-11 | 本钢板材股份有限公司 | A kind of boracic low-carbon hot-rolling acid-cleaning plate and its production method |
| CN108517459A (en) * | 2018-04-04 | 2018-09-11 | 本钢板材股份有限公司 | A kind of boracic low-carbon hot-rolling acid-cleaning plate and its production method |
| CN110479774B (en) * | 2019-08-13 | 2021-01-08 | 武汉钢铁有限公司 | Method for eliminating pit defect on surface of thin hot-rolled pickled steel |
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