CN103572164A - Hot-rolled pickled plate and production method thereof - Google Patents
Hot-rolled pickled plate and production method thereof Download PDFInfo
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- CN103572164A CN103572164A CN201210268590.7A CN201210268590A CN103572164A CN 103572164 A CN103572164 A CN 103572164A CN 201210268590 A CN201210268590 A CN 201210268590A CN 103572164 A CN103572164 A CN 103572164A
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Abstract
The invention discloses a hot-rolled pickled plate and a production method thereof, and the production method of the hot-rolled pickled plate comprises the following steps: performing continuous casting of molten steel to obtain a plate blank, heating the plate blank, successively performing rough rolling and finish rolling to obtain a hot-rolled plate, cooling the hot-rolled plate and reeling to obtain a hot-rolled roll, and pickling the hot-rolled roll to obtain the finished-product hot-rolled pickled plate; the plate blank comprises the following chemical compositions by mass percentage: 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 balance of Fe and unavoidable impurities. The hot-rolled pickled plate has the advantages of excellent properties, high strength, low yield ratio, good welding performance, good forming performance, good surface quality and the like.
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 to take high-quality latten as 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, automobile industry sharply increases the demand of the good hot rolling acid-cleaning plate of impact briquetting, 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 has proposed 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 hot rolling acid-cleaning plate that yield tensile ratio is lower, utilize the method can obtain yield tensile ratio at the acid-cleaning plate below 0.76, but B element price is higher, increased 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 below 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 below 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 to slab, to after described heating of plate blank, pass through successively roughing and finish rolling to obtain hot-rolled sheet, after described hot-rolled sheet is cooling, batch acquisition hot rolled coil, described hot rolled coil is obtained to 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, 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, all the other are Fe.
Preferably, to described slab heat make the temperature of described slab reach 1200 ℃-1240 ℃ after successively through roughing and finish rolling to obtain hot-rolled sheet.
The finishing temperature of preferably, described slab being carried out to finish rolling is 840 ℃-880 ℃.
Preferably, the coiling temperature of described hot-rolled sheet is 640 ℃-680 ℃.
Preferably, the smooth power of pickling when described hot rolled coil is carried out to pickling is 50t-200t, and pickling speed is 50-70m/min.
The present invention also provides a kind of hot rolling acid-cleaning plate, and 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, tensile strength >=490MPa, and 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 obtaining by control continuous casting, especially, by adding appropriate Cr element, make the final tissue of the hot rolling acid-cleaning plate that makes suitably tiny and even, thereby obtain the hot rolling acid-cleaning plate that yield tensile ratio is lower.Hot rolling acid-cleaning plate yield tensile ratio according to the present invention is lower, stable mechanical property and ductility good, be suitable for impact briquetting.
Other features and advantages of the present invention partly in detail are described the embodiment subsequently.
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
According to the production method of hot rolling acid-cleaning plate of the present invention, comprise: continuous casting of molten steel is obtained to slab, to after described heating of plate blank, pass through successively roughing and finish rolling to obtain hot-rolled sheet, after described hot-rolled sheet is cooling, batch acquisition hot rolled coil, described hot rolled coil is obtained to 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, the molten aluminium of Cr:0.60-0.70, Als(acid)≤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 obtaining by control continuous casting, especially, by adding appropriate Cr element, make the final tissue of the hot rolling acid-cleaning plate that makes suitably tiny and even, thereby obtain the hot rolling acid-cleaning plate that yield tensile ratio is lower.
Particularly, in soft steel, add appropriate Cr element can make the Ar3 temperature (austenite starts to separate out ferritic temperature) of steel reduce, thereby avoid producing thick grain structure in steel plate, and, Cr element can make carbide assemble, the netted precipitate of crystal boundary is obviously reduced, thereby make the final tissue of steel plate suitably tiny and even, and avoid surface of steel plate to occur mixed crystal phenomenon, improved the ductility of steel plate, reduced steel plate anisotropy, yield tensile ratio and Cold Brittleness Transition Temperature, and, due to the price of the Cr element price lower than 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 to 0.64-0.66, the ductility of the hot rolling acid-cleaning plate making is better, and yield tensile ratio is also lower.
Molten steel is carried out to continuous casting and can adopt the conventional continuous casting process in this area, for example, the ladle that fills 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, at crystallizer hypomere, with dummy bar, clogs, 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, slab is heated and makes the temperature of slab reach 1200 ℃-1240 ℃, at 1200 ℃-1240 ℃, slab is carried out to the thermal treatment of long period, so that slab reaches the Heating temperature of 1200 ℃-1240 ℃, thereby guarantee 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 obtaining after finish rolling can be 1.8mm-6.0mm, to the start rolling temperature of the temperature out of slab rough rolling and finish rolling, can adopt the conventional temperature in this area, the finishing temperature of slab being carried out to finish rolling is preferably 840 ℃-880 ℃, to guarantee that slab is carried out to austenitic area rolling (being that rolling temperature is more than Ar3), avoid mixed grain structure to produce, the weave construction of the hot-rolled sheet that impact makes.
Can adopt the conventional hot continuous rolling laminar cooling system in this area to carry out cooling to hot-rolled sheet, and, because coiling temperature is the important factor that affects the physicals of the hot rolling acid-cleaning plate making, therefore, by controlling speed of cooling, the coiling temperature that guarantees hot-rolled sheet is preferably 640 ℃-680 ℃, can make like this austenite fully be converted into ferrite.
Hot-rolled sheet is batched and obtained after hot rolled coil through reeling machine, hot rolled coil is carried out to pickling, to remove surperficial oxide skin, preferably, the smooth power of pickling when hot rolled coil is carried out to pickling 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, select suitable pickling speed can guarantee oxide skin remove clean, and guarantee pickle solution not with oxide skin in iron-based body react and produce overpickling phenomenon.And preferably, pickling finishes rear to hot rolled coil painting oil treatment, to prevent that hot rolled coil from getting rusty.
On the other hand, the present invention also provides a kind of hot rolling acid-cleaning plate being made 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 characterictic described in above-mentioned embodiment, in reconcilable situation, can combine by any suitable mode in addition.In addition, between various embodiment of the present invention, also can carry out arbitrary combination, 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 test at room temperature method.
The measuring method of tensile strength: GB/T 228-2002 metallic substance tensile test at room temperature method.
The measuring method of unit elongation: GB/T 228-2002 metallic substance tensile test at room temperature method.
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; Respectively slab N1-N5 is heated, the temperature that slab N1-N5 can reach after heating is respectively as shown in the Ta in table 2; Then through two reversing roughers, 6 passage roughing are rolled into intermediate blank to slab N1-N5, the width of intermediate blank is 1160mm, the thickness of intermediate blank is 35mm, this intermediate blank enters after Coil Box insulation that in six frame finishing train, finish rolling is to obtain hot-rolled sheet, and the finishing temperature of finish rolling is respectively as shown in the Tb in table 2; After the hot-rolled sheet that again finish rolling obtained is respectively cooling, batch acquisition hot rolled coil, the temperature that hot-rolled sheet is batched is respectively as shown in the Tc in table 2; Finally, respectively hot rolled coil is carried out to pickling, 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 the hot rolling acid-cleaning plate finally making 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; Respectively slab N6-N8 is heated, the temperature that slab N6-N8 can reach after heating is respectively as shown in the Ta in table 4; Then through two reversing roughers, 6 passage roughing are rolled into intermediate blank to slab N6-N8, the width of intermediate blank is 1160mm, the thickness of intermediate blank is 35mm, this intermediate blank enters after Coil Box insulation that in six frame finishing train, finish rolling is to obtain hot-rolled sheet, and the finishing temperature of finish rolling is respectively as shown in the Tb in table 4; After the hot-rolled sheet that again finish rolling obtained is respectively cooling, batch acquisition hot rolled coil, the temperature that hot-rolled sheet is batched is respectively as shown in the Tc in table 4; Finally, respectively hot rolled coil is carried out to pickling, 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 the hot rolling acid-cleaning plate finally making 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 |
According to national standard, respectively the hot rolling acid-cleaning plate in embodiment 1-5 and comparative example 1-3 is carried out to performance test, 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 below 0.7, impact briquetting performance is good.Embodiment 1-5 and comparative example 3 are compared and can be found out, the interpolation of Cr element greatly improves the unit elongation of hot rolling acid-cleaning plate and makes yield tensile ratio greatly lower, and, by comparative example 1-5, can find out, when the mass percent of Cr element is 0.64-0.66, the raising best results to 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 reduced to below 0.7, improved the impact briquetting performance of this hot rolling acid-cleaning plate, because Cr price is lower, make to produce the cost of the hot rolling acid-cleaning plate of low yield strength ratio, and the method technique controlling difficulty is less and workable.The weave construction of using the hot rolling acid-cleaning plate that the method makes is tiny cutting evenly suitably, the less mixed crystal phenomenon that occurs, and ductility is better, and the mechanical property of steel plate produced is stable and anisotropy is little.
Claims (10)
1. the production method of a hot rolling acid-cleaning plate, the method comprises: continuous casting of molten steel is obtained to slab, to after described heating of plate blank, pass through successively roughing and finish rolling to obtain hot-rolled sheet, after described hot-rolled sheet is cooling, batch acquisition hot rolled coil, described hot rolled coil is obtained to 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:0.60-0.70, Als≤0.015, all the other are Fe.
2. the production method of hot rolling acid-cleaning plate according to claim 1, 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:0.64-0.66, Als≤0.015, all the other are Fe.
3. the production method of hot rolling acid-cleaning plate according to claim 1, wherein, to described slab heat make the temperature of described slab reach 1200 ℃-1240 ℃ after successively through roughing and finish rolling to obtain hot-rolled sheet.
4. the production method of hot rolling acid-cleaning plate according to claim 1, wherein, the finishing temperature of described slab being carried out to finish rolling is 840 ℃-880 ℃.
5. the production method of hot rolling acid-cleaning plate according to claim 1, wherein, the coiling temperature of described hot-rolled sheet is 640 ℃-680 ℃.
6. the production method of hot rolling acid-cleaning plate according to claim 1, wherein, the smooth power of pickling when described hot rolled coil is carried out to pickling is 50-200t, pickling speed is 50-70m/min.
7. 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.
8. hot rolling acid-cleaning plate according to claim 7, wherein, the thickness of this hot rolling acid-cleaning plate is 1.8mm-6.0mm.
9. hot rolling acid-cleaning plate according to claim 8, wherein, the metallographic structure of this hot rolling acid-cleaning plate is ferrite and pearlite tissue.
10. according to the hot rolling acid-cleaning plate described in any one in claim 7-9, wherein, the yield strength of this hot rolling acid-cleaning plate is 330MPa-380MPa, tensile strength >=490MPa, and unit elongation >=30%, yield tensile ratio is below 0.7.
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Cited By (5)
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| CN107472314A (en) * | 2017-08-21 | 2017-12-15 | 太仓森楚源机械设备有限公司 | new dust car |
| 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 |
| 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 |
| CN110479774A (en) * | 2019-08-13 | 2019-11-22 | 武汉钢铁有限公司 | The method for eliminating thin gauge hot rolling acid-cleaning steel surface pit defect |
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| CN110479774A (en) * | 2019-08-13 | 2019-11-22 | 武汉钢铁有限公司 | The method for eliminating thin gauge hot rolling acid-cleaning steel surface pit defect |
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