CN101096034A - Production method of ultra-low-carbon steel for sedan car cortical plate - Google Patents
Production method of ultra-low-carbon steel for sedan car cortical plate Download PDFInfo
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Abstract
The invention provides a producing method for ultra low steel carbon used in car outer plate, characterized in that liquid steel is cast into plate slab in the pulling speed of 1.5-4m/min; the thickness of plate slab is 100-170mm; casting machine adopts dynamic light pressure and crystallizer electromagnetic braking technology and tundish superheat is 20-45deg.C; the plate slab is installed in heat directly and the charging temperature is more than 800deg.C; the plate slab is heated to 1150-1250deg.C in heating furnace; after the temperature is maintained for 30-90min rough rolling cogging is carried out. By adopting continuous rolling and casting short-flow process of medium-thin plate slab and collocating casting machine and heating furnace compactly quick charging is realized; charging material temperature is improved; problems of large investment and high energy consumption in conventional process are solved; inner limitation generated in continuous casting process of thin plate is eliminated; it is guaranteed that product is provided with good surface quality and stable mechanical property.
Description
Technical field
The present invention relates to a kind of manufacture method of automobile steel, especially a kind of method of utilizing the medium thin slab continuous casting and rolling production line to produce ultra-low-carbon steel for sedan car cortical plate belongs to metallurgical stress metal processing technique field.
Background technology
At present, adopt traditional production technology to produce the automobile ultra-low-carbon steel, through pneumatic steelmaking, sheet billet continuous casting, heating furnace heat, roughing mill is rolling, mm finishing mill unit is rolling, laminar flow cools off, batch, pickling, cold rolling, bell-type annealing or continuous annealing.This mature production technology, good product quality.On traditional conticaster with low casting speed continuous casting, slab thickness 〉=200mm, pulling rate is at 0.8～1.3m/min.Adopt traditional hot rolling technology to produce automobile steel, the casting machine weight of equipment is big, hot rolling line long, it is big to take up an area of, equipment investment is big, energy consumption is high.
CSP is near net shape continuous casting and the married short flow process technology of succeeding in developing the end of the eighties in last century of tandem rolling, thin plate slab continuous casting rolling process exploitation success back development is very fast, the whole world adopts the steel plate total output of CSP production technology production above 9,000 ten thousand tons/year at present, steel grade mainly comprises straight carbon steel, Hi-Stren steel and part micro alloyed steel, carbon aluminium-killed steel etc., its technological process is for being cast out the slab of thick 50～70mm by vertical with bending type continuous casting machine, shear the back in the tunnel heating heating, through de-scaling, mm finishing mill unit is rolling, the laminar flow cooling, batch rolling at last.When producing thickness and be 50～70mm strand in the CSP mode, pulling rate is very fast, be 3～6m/min, this production technology has that investment is little, production cost is low, strand charging temperature height, reduce the heating energy consumption, simplify the roughing operation, strengthen the advantage of mm finishing mill unit, can be suitable for the production of thin slab product, and straight carbon steel, Hi-Stren steel plate property are suitable with the traditional handicraft properties of product.But when adopting this technology, production capacity is lower, and slab quality can not get guaranteeing that (when producing automobile steel with the thin plate strand, intensity is very high, does not reach requirement; In addition, because teeming speed is very fast, strand is mingled with many), can't produce the kind of high surface grade requirement, as the car outside plate etc.
Summary of the invention
The object of the present invention is to provide a kind of production method of ultra-low-carbon steel for sedan car cortical plate, guaranteeing under the product quality premise, reduce to invest, reduce cost to reach.By rational slab thickness, pulling rate are set, P and all kinds of segregation that is mingled with have been reduced.The direct hot charging of slab makes reduce heat time heating time again simultaneously, has reduced significantly and has heated energy consumption again.
The object of the present invention is achieved like this, and the feature of this production method of ultra-low-carbon steel for sedan car cortical plate is:
A) sheet billet continuous casting, molten steel becomes slab with the casting speed continuous casting of 1.5～4m/min, and slab thickness is 100～170mm, and casting machine adopts and dynamically gently depresses and the crystallizer electromagnetic brake technology, and the tundish degree of superheat is 20～45 ℃;
B) slab direct hot charging, charging temperature 〉=800 ℃ are heated to 1150～1250 ℃ in heating furnace, behind insulation 30～90min, carry out the roughing cogging.
The further feature of production method of ultra-low-carbon steel for sedan car cortical plate of the present invention is: the finish rolling start rolling temperature is 1000～1100 ℃, and the finish rolling outlet temperature is 890～950 ℃, and steel plate adopts the laminar flow cooling after going out finishing mill immediately, and coiling temperature is 700～750 ℃; Hot-strip is the ferrite of the even small grains of solid solution atom very close to each other, the microscopic structure of the sparse thick second phase particle that distributing on the matrix; Hot-strip is rolling through overpickling, tandem mills, and continous way annealing or bell-type annealing, forms to have stronger { the final tissue of 111} texture, r value 〉=1.8, n value 〉=0.2; The width of slab and hot-strip is controlled at 1000～2000mm, and the THICKNESS CONTROL of hot-strip is at 2.0～6.0mm.
Production method of ultra-low-carbon steel for sedan car cortical plate of the present invention, can also be by following technological means, for cold rolling process provides quality raw materials: 1) behind heating furnace, roughing mill and finishing mill three places that enter the mouth carry out high-pressure water descaling, the de-scaling water pressure is 22～25MPa, guarantees strip surface quality; 2) finishing mill F1～F4 frame adopts the high-speed steel working roll, is used roll gap cooling technology, technological lubrication technology, guarantees the work roll surface state; 3) by adopt variable contact support roller technology (ASPB), linear convexity Working roll technique (LVC) and the plate shape automatic control system (ASC) of becoming in finish rolling, guarantee strip profile and flatness and convexity.
The smelting component of ultra-low-carbon steel for sedan car cortical plate of the present invention (Wt%) is: C :≤0.006%, and Si :≤0.15%, Mn :≤0.50%, P :≤0.015%, S :≤0.015%, Ti≤0.10%, Als≤0.06%, N≤0.003%.Surplus is Fe and unavoidable impurities.
When needs increase the intensity (high-strength IF steel) of steel or baking hardenability, in the composition of above-mentioned steel, add P:0.03%～0.10%; Or add P:0.03%～0.10%, B:0.001%～0.005% simultaneously.
Because the present invention has mainly adopted the medium thin slab continuous casting and rolling productive technology of short flow, continuous casting adopts thin plate strand among 100 moderate～170mm of pulling rate, and the configuration of casting machine and heating furnace close-coupled (casting machine go out blank roller way be exactly heating furnace go into the furnace roller road), superfast loading, improve and go into the stove blank temperature, overcome conventional production process and CSP production technology and produced the deficiency of ultra-low-carbon steel, had following beneficial effect:
1. casting machine and heating furnace adopt close-coupled to arrange that strand charging temperature height with the traditional handicraft ratio, helps reducing the automobile steel production cost.
2. because rolling line length is short, finish rolling start rolling temperature and the assurance ability height of finishing temperature than traditional handicraft, so, can adopt lower slab heating temperature and heat time heating time, reduce the dissolving of AlN, Ti (C, N) the grade in an imperial examination two-phase particle in the slab, and make the second phase particle separate out thicker, recrystallization temperature is lower, can greatly improve r value and the n value of automobile with the IF steel, the deep drawability that acquisition is got well.
3. the slab pulling rate is slower than CSP, and the precipitate size of the AlN in the strand, Ti (C, N) grade in an imperial examination two-phase particle is bigger, and inclusion floating is abundant, is beneficial to the deep drawability that improves product and improves surface quality.
4. slab is thicker than CSP, and pulling rate is also reasonable, can produce the automobile IF steel of high-mouldability, high surface grade, and production capacity is higher than CSP.
The specific embodiment
1. production process route is: the dark desulfurization → converter smelting of molten iron → external refining → medium thin slab casting machine continuous casting → direct hot charging → heating → roughing → finish rolling → laminar flow cools off → batches → pickling → cold rolling → continous way annealing or bell-type annealing.
2. Composition Control (wt%)
| Embodiment | C | Si | Mn | P | S | Als | N | Nb | Ti | B |
| Example 1 | 0.002 | 0.012 | 0.15 | 0.003 | 0.006 | 0.053 | 0.0015 | 0.066 | ||
| Example 2 | 0.003 | 0.023 | 0.17 | 0.008 | 0.0052 | 0.043 | 0.0019 | 0.017 | 0.045 | |
| Example 3 | 0.004 | 0.022 | 0.21 | 0.009 | 0.0082 | 0.036 | 0.0023 | 0.011 | 0.032 | |
| Example 4 | 0.003 | 0.02 | 0.25 | 0.056 | 0.0054 | 0.050 | 0.0024 | 0.028 | 0.035 | |
| Example 5 | 0.004 | 0.022 | 0.21 | 0.059 | 0.0064 | 0.052 | 0.0027 | 0.021 | 0.040 | 0.002 |
3. slab continuous casting rolling technology
| Embodiment | Slab pulling rate (m/min) | Slab thickness (mm) | Width of plate slab (mm) | The slab charging temperature (℃) | Slab heating temperature (℃) | Temperature retention time (min) |
| Embodiment 1 | 2.5 | 135 | 1500 | 880 | 1240 | 40 |
| Embodiment 2 | 2.2 | 135 | 2000 | 860 | 1240 | 50 |
| Embodiment 3 | 1.9 | 170 | 1250 | 840 | 1240 | 70 |
| Embodiment 4 | 1.7 | 170 | 1500 | 830 | 1240 | 80 |
| Embodiment 5 | 1.5 | 170 | 2000 | 810 | 1240 | 90 |
1150～1250 ℃ of slab heating temperatures, 1050 ± 30 ℃ of finish rolling start rolling temperatures, 930 ± 30 ℃ of finishing temperature scopes, 730 ± 30 ℃ of controls of coiling temperature.Go out to drop into laminar flow immediately behind the finishing mill and be cooled to coiling temperature.Behind heating furnace, roughing mill and finishing mill three places that enter the mouth carry out high-pressure water descaling, the de-scaling water pressure is 22～25MPa, finishing mill F1～F4 frame employing high-speed steel working roll and roll gap cooling technology, technological lubrication technology, mm finishing mill unit adopt variable contact support roller technology (ASPB), linear change convexity Working roll technique (LVC) and plate shape to control (ASC) automatically.
4. final finished mechanical property
| Embodiment | Yield strength (MPa) | Tensile strength (MPa) | Percentage elongation (%) | The n value | The r value |
| Example 1 | 160 | 285 | 47 | 0.23 | 2.33 |
| Example 2 | 147 | 300 | 49 | 0.22 | 2.21 |
| Example 3 | 151 | 305 | 47 | 0.24 | 2.10 |
| Example 4 | 236 | 365 | 40 | 0.22 | 1.98 |
| Example 5 | 242 | 351 | 42 | 0.21 | 2.11 |
Claims (9)
1. a production method of ultra-low-carbon steel for sedan car cortical plate comprises pneumatic steelmaking, sheet billet continuous casting, hot rolling, pickling, cold rolling, annealing, it is characterized in that:
A) sheet billet continuous casting, molten steel becomes slab with the casting speed continuous casting of 1.5～4m/min, and slab thickness is 100～170mm, and casting machine adopts and dynamically gently depresses and the crystallizer electromagnetic brake technology, and the tundish degree of superheat is 20～45 ℃;
B) slab direct hot charging, charging temperature 〉=800 ℃ are heated to 1150～1250 ℃ in heating furnace, behind insulation 30～90min, carry out the roughing cogging.
2. production method of ultra-low-carbon steel for sedan car cortical plate according to claim 1, it is characterized in that the finish rolling start rolling temperature is 1000～1100 ℃, the finish rolling outlet temperature is 890～950 ℃, and steel plate adopts the laminar flow cooling after going out finishing mill immediately, and coiling temperature is 700～750 ℃; Hot-strip is the ferrite of the even small grains of solid solution atom very close to each other, the microscopic structure of the sparse thick second phase particle that distributing on the matrix; Hot-strip is rolling through overpickling, tandem mills, and continous way annealing or bell-type annealing, forms to have stronger { the final tissue of 111} texture, r value 〉=1.8, n value 〉=0.2.
3. production method of ultra-low-carbon steel for sedan car cortical plate according to claim 1 is characterized in that the width of slab and hot-strip is controlled at 1000～2000mm; The THICKNESS CONTROL of hot-strip is at 2.0～6.0mm.
4. production method of ultra-low-carbon steel for sedan car cortical plate according to claim 1 is characterized in that behind heating furnace, roughing mill and finishing mill three places that enter the mouth carry out high-pressure water descaling, and the de-scaling water pressure is 22～25MPa.
5. production method of ultra-low-carbon steel for sedan car cortical plate according to claim 1 is characterized in that finishing mill F1～F4 frame adopts the high-speed steel working roll, and is used roll gap cooling technology, technological lubrication technology.
6. production method of ultra-low-carbon steel for sedan car cortical plate according to claim 1 is characterized in that finish rolling employing variable contact support roller technology (ASPB), linear convexity Working roll technique (LVC) and the plate shape automatic control system (ASC) of becoming.
7. production method of ultra-low-carbon steel for sedan car cortical plate according to claim 1, the percentage by weight that it is characterized in that the molten steel chemical composition is: C :≤0.006%, Si :≤0.15%, Mn :≤0.50%, P :≤0.015%, S :≤0.015%, Ti≤0.10%, Als≤0.06%, N≤0.003%, surplus is Fe and unavoidable impurities.
8. production method of ultra-low-carbon steel for sedan car cortical plate according to claim 7 is characterized in that adding in the molten steel Nb≤0.05%.
9. according to claim 7 or 8 described production method of ultra-low-carbon steel for sedan car cortical plate, it is characterized in that adding P:0.03%～0.10% in the molten steel again, or add P:0.03%～0.10%, B:0.001%～0.005% simultaneously.
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