CN102605250B - Vehicle steel plate and production method thereof - Google Patents
Vehicle steel plate and production method thereof Download PDFInfo
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- CN102605250B CN102605250B CN201210084801.1A CN201210084801A CN102605250B CN 102605250 B CN102605250 B CN 102605250B CN 201210084801 A CN201210084801 A CN 201210084801A CN 102605250 B CN102605250 B CN 102605250B
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Abstract
The invention discloses a vehicle steel plate. The vehicle steel plate comprises the following chemical components in percentage by weight: less than or equal to 0.0015 percent of C, less than or equal to 0.03 percent of Si, less than or equal to 0.09 to 0.15 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.010 percent of S, 0.020 to 0.045 percent of Alt, 0.06 to 0.08 percent of Ti, less than or equal to 0.004 percent of N and the balance of Fe and trace elements. The invention also discloses a production method for the vehicle steel plate. By the method, the vehicle steel plate with low yield and high plasticity is successfully produced by adjusting the chemical components and optimizing hot-rolling, cold-rolling and annealing process parameters and leveling process parameters. The vehicle steel plate produced by the method has the characteristics of low yield ratio and high molding performance. The quality problems about wrinkling and cracking caused by stamping, and the like can be greatly solved. The using requirement of clients is better met, and considerable economic benefits can be created.
Description
Technical field
The invention belongs to metal material processing field, be specifically related to a kind of automotive sheet and production method thereof.
Background technology
DC06 is a kind of gapless atomic steel (IF steel), and this steel plate, mainly for the manufacture of super deep-draw auto parts (once in a while also for the complicated electrical accessory that is shaped), therefore requires very high to plasticity.Requirement by GB/T5213-2008 to similar steel grade, its composition is: C ,≤0.02%; Mn ,≤0.30%; P≤0.020%; S≤0.020%; Alt, >=0.015%; Ti ,≤0.30%; Surplus is Fe.GB is to its yield strength requirement≤170MPa, tensile strength 270～330MPa, elongation after fracture >=41%, r90 >=2.1, n90 >=0.22.Europe superscript EN1013-2006 requires its composition: C ,≤0.02%; Mn ,≤0.25%; P≤0.020%; S≤0.020%; Ti ,≤0.30%; Surplus is Fe.Europe superscript performance requriements is identical with GB.For this steel grade, conventionally adopt constituent contents such as controlling C, Mn to meet the requirement of tensile strength, often bring the rising of yield strength, yield tensile ratio improves, r value reduces, be unfavorable for the stamping of steel plate, when coin complex forming part or the very large part of drawing depth, be prone to shaping line, wrinkling, problems of crack.In order to address this problem, the material yield tensile ratio that needs a person with the qualifications of a general is controlled at suitable scope, need to control rational chemical composition, hot rolling technology, cold rolling draft, annealing process, smooth unit elongation etc. for this reason, thereby obtain suitable two-phase precipitation particles and be conducive to { the 111} texture of deep-draw.
Summary of the invention
The object of the invention is to, overcome existing autobody sheet yield strength higher, low cross-intensity, when coin complex part, easily there is shaping line, wrinkling, problems of crack, a kind of low yield strength ratio, high-mouldability energy feature are provided, can greatly reduce automotive sheet and the production method thereof of the quality problems such as punching press is wrinkling, cracking.
The production method that the invention provides a kind of automotive sheet, comprising:
By molten steel by refining after continuous casting obtain slab, the chemical composition mass percent of described slab is: C:0.0005%; Si≤0.03%; Mn:0.09%-0.15%; P≤0.001%; S≤0.001%; Alt:0.038%-0.045%; Ti:0.06%-0.08%; N≤0.0014%; Surplus is Fe and trace element;
Described slab is heated, and Heating temperature is 1260-1300 ℃, and be 2.8-3.5 hour heat-up time;
Described slab is obtained to needed width of plate slab, through two roller roughing, four roller roughing, obtains intermediate blank again through fixed-width pressure machine;
Described intermediate blank is obtained to hot-rolled sheet by finish rolling;
Between roughing and finish rolling, enable stay-warm case, guarantee the homogeneity of intermediate blank temperature;
Described hot-rolled sheet is coiled into hot rolled coil after laminar flow is cooling, and the cooling employing leading portion of described laminar flow is cooling mode fast;
By described hot rolled coil, by the chill volume of cold rolling acquisition, the finishing temperature of described hot-rolled sheet is that 930 ± 20 ℃, coiling temperature are 770 ℃;
Described chill volume is processed and obtained band steel through continuous annealing, and then through the smooth finished product that coils into, when described chill volume is annealed by vertical continuous annealing furnace, in continuous annealing furnace, the temperature of each section is as shown in the table:
| Heating zone/℃ | Soaking zone/℃ | Slow cooling outlet/℃ | Fast cold outlet/℃ | Overaging/℃ |
| 840±10 | 840±10 | 680 | 420～460 | 360±20 |
；
Described continuous annealing process speed is 180～250mpm.
Further, describedly by hot rolled coil, by the chill volume of cold rolling acquisition, be:
By hot rolled coil through straightening scale breading;
Hot rolled coil after straightening scale breading is removed to its scale on surface by continuous turbulent pickling, then through tandem mills, carry out the cold rolling chill volume of making.
Further, described hot rolled coil carries out when cold rolling, and cold rolling draft is 60～85%.
Further, described by described chill volume process continuous annealing processing acquisition band steel, then the smooth finished product that coils into comprises:
Described chill volume is cleaned and removes its surface and oil contaminant through cleaning section;
Chill volume after described cleaning is carried out to anneal by vertical continuous annealing furnace and obtain band steel;
Described band steel is carried out smooth through levelling machine, then batch as finished product.
Further, the smooth unit elongation of described levelling machine is controlled at 0.8 ± 0.2% according to belt steel thickness specifications vary.The production method of a kind of automotive sheet provided by the invention, by adjusting chemical composition, optimize hot rolling, cold rolling and parameter and annealing, flattening technological parameter, successfully produce the automotive sheet of low surrender high-ductility, the steel plate that uses the method to produce has the feature of low yield strength ratio, high-mouldability energy, can greatly reduce the quality problems such as punching press is wrinkling, cracking, better meet client's service requirements, can bring considerable economic benefit.
Accompanying drawing explanation
The distribution situation schematic diagram of a kind of automotive sheet yield strength that Fig. 1 provides for the embodiment of the present invention;
The distribution situation schematic diagram of a kind of automotive sheet tensile strength that Fig. 2 provides for the embodiment of the present invention;
The microstructure schematic diagram of the automotive sheet that Fig. 3 produces for the method for using the embodiment of the present invention and providing.
Embodiment
The invention provides a kind of automotive sheet of embodiment and production method thereof, by the optimization design to automotive sheet composition, adjust and optimize hot rolling, cold rolling and parameter and annealing, flattening technological parameter, successfully produce the automotive sheet of low surrender high-ductility.This auto sheet by the chemical composition mass percent of steel is: C≤0.0015%; Si≤0.03%; Mn:0.09%-0.15%; P≤0.010%; S≤0.010%; Alt:0.020%-0.045%; Ti:0.06%-0.08%; N≤0.004%; Surplus is Fe and trace element.
The embodiment of the present invention also provides a kind of method of producing this automotive sheet to comprise:
Step S1, by molten steel by refining after continuous casting obtain slab.
Step S2, described slab is heated, then obtain hot-rolled sheet through roughing, finish rolling, then described hot-rolled sheet is carried out to laminar flow cooling, coil into hot rolled coil after cooling.
Step S3, by hot rolled coil by the chill volume of cold rolling acquisition.
Step S4, chill volume is processed and obtained band steel through continuous annealing, then through the smooth finished product that coils into.
Wherein, step S2 heats slab, then obtains hot-rolled sheet through roughing, finish rolling, then hot-rolled sheet is carried out to laminar flow cooling, coils into hot rolled coil after cooling to comprise the following steps:
Step S21, slab is heated, Heating temperature is 1260-1300 ℃, and be 2.8-3.5 hour heat-up time;
Step S22: slab is obtained to needed width of plate slab, obtains intermediate blank through two roller roughing, four roller roughing again through fixed-width pressure machine.
Step S23: enable stay-warm case between roughing and finish rolling, guarantee the homogeneity of intermediate blank temperature.
Step S24: intermediate blank is obtained to hot-rolled sheet through finishing train.Finishing temperature is 930 ± 20 ℃.
Step S25: hot-rolled sheet is coiled into hot rolled coil by reeling machine after laminar flow is cooling.Hot-rolled sheet is by the cooling rolling of batching of laminar flow, and the cooling employing leading portion of laminar flow is cooling mode fast.Coiling temperature is 750 ± 20 ℃.
Step S3, hot rolled coil is comprised the following steps by the chill volume of cold rolling acquisition:
Step S31: by hot rolled coil through straightening scale breading;
Step S32: the hot rolled coil after straightening scale breading is removed to its scale on surface by continuous turbulent pickling, then carry out the cold rolling chill volume of making through tandem mills.Hot rolled coil carries out when cold rolling, and cold rolling draft is 60-85%.
Step S4, chill volume is processed and obtained band steel through continuous annealing, then the smooth finished product that coils into comprises the following steps:
Step S41: chill volume is cleaned and removes its surface and oil contaminant through cleaning section.
Step S42: the chill volume after cleaning is carried out to anneal by vertical continuous annealing furnace and obtain band steel.Continuous annealing process speed is 180-250mpm, and in continuous annealing furnace, the temperature of each section is as shown in table 1 below:
Table 1
| Heating zone/℃ | Soaking zone/℃ | Slow cooling outlet/℃ | Fast cold outlet/℃ | Overaging/℃ |
| 840±10 | 840±10 | 660±20 | 410～460 | 360±20 |
Step S43: described band steel is carried out smooth through levelling machine, then batch as finished product.The smooth unit elongation of levelling machine is controlled at 0.8 ± 0.2% according to belt steel thickness specifications vary.
Fig. 1 is the distribution situation of 297 volume DC06 product yield strengths of the present invention, and yield strength is distributed in 120-148MPa, mean value 130MPa, standard deviation 6.06MPa.Fig. 2 is the distribution situation of 297 volume DC06 product tensile strength of the present invention, and tensile strength is distributed in 275-310MPa, mean value 290MPa, standard deviation 6.63MPa.Shown in Fig. 1, Fig. 2, the yield strength of the product that production method is produced of a kind of automotive sheet provided by the invention is on average in 130MPa left and right, and tensile strength is on average in 290MPa left and right, and yield tensile ratio is 0.448.Fig. 3 is the microstructure picture (adopting the etch of picric acid Sodium Metabisulfite solution) of steel plate of the present invention, and grey black is ferrite matrix; Brilliant white is martensite island.
It is to connect to move back the motivating force of operation continuous annealing recrystallize to implement certain cold rolling draft with steel that operation is rolled in acid, and determined Recrystallization nucleation point number.This invention, according to different DC06 belt steel thickness specifications, is roughly controlled at cold rolling draft in 60～85% scopes.
The relative reduction of chemical composition C content, has reduced Fe3C and pearlitic content in matrix, is conducive to obtain lower yield strength, and the finished product yield strength is reduced and has significant effect.
Higher annealing problem is to reduce the another effective ways of yield strength, the present invention adopts 840 ± 10 ℃ of high temperature annealings, make chill DC06 band steel that abundant recrystallize occur in stove, by control the soaking zone time better regulate that cementite is decentralized, the size of pearlitic spheroidization and grain-size, thereby better control yield strength level.
Yield strength and tensile strength are conflict to a certain extent, and yield strength can cause the reduction of tensile strength when reducing conventionally.In order to obtain higher tensile strength and suitable yield tensile ratio, the present invention regulates by controlling the fast cold section of temperature out of continuous annealing and slow cooling temperature out.Higher annealing temperature makes the Fe in steel matrix
3c decomposes, and rationally controls slow cooling temperature out, can control the dissolved carbon content level in matrix, adopt lower fast cold temperature out, can make the free carbon atom being solidly soluted in matrix fully be solidly soluted in steel matrix, thereby play the effect of solution strengthening, improve tensile strength.
In order further to improve automobile, with DC06, connect and move back product performance and eliminate some little defects, the present invention adopts 1.2 ± 0.3% smooth unit elongation to control.
The present invention is by adjusting chemical composition, optimize hot rolling, cold rolling and parameter and annealing, flattening technological parameter, the automobile of successfully producing low surrender high-ductility connects and moves back product with DC06, the steel plate that uses the method to produce has the feature of low yield strength ratio, high-mouldability energy, can greatly reduce the quality problems such as punching press is wrinkling, cracking, better meet client's service requirements, can bring considerable economic benefit.
Below in conjunction with specific embodiment, the present invention is further described.
Embodiment mono-:
A kind of automotive sheet chemical composition mass percent that the present embodiment provides is C:0.0015, Si:0.01, and Mn:0.11, P:0.006, S:0.006, Alt:0.038, N:0.0014, surplus is iron and other trace elements.
By the molten iron of said ratio composition by refining after continuous casting obtain slab, slab is heated, Heating temperature is 1270 ℃, be 2.8 hours heat-up time; Slab after heating is obtained to hot-rolled sheet by hot rolling, batch acquisition hot rolled coil after hot-rolled sheet laminar flow is cooling, hot rolling finishing temperature is 920 ℃; Hot rolling reeling temperature is 730 ℃.Hot-rolled sheet thickness 4.0mm.Hot rolled coil is obtained after cold rolling to chill volume, Cold Rolled Plate Thickness 0.7mm, draft is 82.5%.After chill volume continuous annealing is processed, obtain band steel, continuous annealing process parameter is controlled as shown in table 2.
The continuous annealing temperature parameter that table 2 the present invention adopts
| Preheating | Heating | Soaking | Slow cooling | Cold soon | Overaging |
| 250℃ | 840℃ | 840℃ | 650℃ | 420℃ | 340℃ |
Finally belt steel flating is coiled into finished product, smooth elongation control is 0.8%.
According to the DC06 auto sheet results of property after above-mentioned art breading, as table 3, can find out that the indices of trial-production steel is all up to standard, and yield strength is considerably beyond standard-required.The present invention adopts low C, high Si, low Mn Composition Design, and the crowding-out of Si improves C, the Mn utilising efficiency in martensite, and therefore the DC06 steel plate of invention has good intensity and plasticity coupling.
Table 3 the present invention manufacture experimently DC06 auto sheet mechanical property and with the contrast of relevant criterion
| ? | R p0.2,N/mm 2 | R m,N/mm 2 | A 80,% | r 90 | n 90 |
| GB | ≤170 | 270～330 | ≥41 | ≥2.1 | ≥0.22 |
| Europe superscript | ≤170 | 270～330 | ≥41 | ≥2.1 | ≥0.22 |
| The present invention | 129 | 295 | 43.5 | 3.25 | 0.24 |
Embodiment bis-:
It is C:0.001 that a kind of automotive sheet that the present embodiment provides changes into composition quality per-cent, Si:0.03, and Mn:0.15, P:0.010, S:0.010, Alt:0.045, N:0.004, Ti:0.08, surplus is iron and other trace elements.
By the molten iron of said ratio composition by refining after continuous casting obtain slab, slab is heated, Heating temperature is 1300 ℃, be 3.5 hours heat-up time; Slab after heating is obtained to hot-rolled sheet by hot rolling, batch acquisition hot rolled coil after hot-rolled sheet laminar flow is cooling, hot rolling finishing temperature is 950 ℃; Hot rolling reeling temperature is 770 ℃.Hot-rolled sheet thickness 4.0mm.Hot rolled coil is obtained after cold rolling to chill volume, Cold Rolled Plate Thickness 0.7mm, draft is 85%.After chill volume continuous annealing is processed, obtain band steel, continuous annealing process parameter is controlled as shown in table 4.
The continuous annealing temperature parameter that table 4 the present invention adopts
| Preheating | Heating | Soaking | Slow cooling | Cold soon | Overaging |
| 250℃ | 850℃ | 850℃ | 680℃ | 460℃ | 380℃ |
Finally belt steel flating is coiled into finished product, smooth elongation control is 1.0%.
According to the DC06 auto sheet results of property after above-mentioned art breading, as table 5, can find out that the indices of trial-production steel is all up to standard, and yield strength is considerably beyond standard-required.The present invention adopts low C, high Si, low Mn Composition Design, and the crowding-out of Si improves C, the Mn utilising efficiency in martensite, and therefore the DC06 steel plate of invention has good intensity and plasticity coupling.
Table 5 the present invention manufacture experimently DC06 auto sheet mechanical property and with the contrast of relevant criterion
| ? | R p0.2,N/mm 2 | R m,N/mm 2 | A 80,% | r 90 | n 90 |
| GB | ≤170 | 270～330 | ≥41 | ≥2.1 | ≥0.22 |
| Europe superscript | ≤170 | 270～330 | ≥41 | ≥2.1 | ≥0.22 |
| The present invention | 118 | 310 | 42.9 | 3.11 | 0.24 |
Embodiment tri-:
It is C:0.0005 that a kind of automotive sheet that the present embodiment provides changes into composition quality per-cent, Si:0.001, and Mn:0.09, P:0.001, S:0.001, Alt:0.020, N:0.0005, Ti:0.06, surplus is iron and other trace elements.
By the molten iron of said ratio composition by refining after continuous casting obtain slab, slab is heated, Heating temperature is 1260 ℃, be 3 hours heat-up time; Slab after heating is obtained to hot-rolled sheet by hot rolling, batch acquisition hot rolled coil after hot-rolled sheet laminar flow is cooling, hot rolling finishing temperature is 910 ℃; Hot rolling reeling temperature is 730 ℃.Hot-rolled sheet thickness 4.0mm.Hot rolled coil is obtained after cold rolling to chill volume, Cold Rolled Plate Thickness 0.7mm, draft is 60%.After chill volume continuous annealing is processed, obtain band steel, continuous annealing process parameter is controlled as shown in table 6.
The continuous annealing temperature parameter that table 6 the present invention adopts
| Preheating | Heating | Soaking | Slow cooling | Cold soon | Overaging |
| 250℃ | 830℃ | 830℃ | 640℃ | 410℃ | 340℃ |
Finally belt steel flating is coiled into finished product, smooth elongation control is 1.0%.
According to the DC06 auto sheet results of property after above-mentioned art breading, as table 7, can find out that the indices of trial-production steel is all up to standard, and yield strength is considerably beyond standard-required.The present invention adopts low C, high Si, low Mn Composition Design, and the crowding-out of Si improves C, the Mn utilising efficiency in martensite, and therefore the DC06 steel plate of invention has good intensity and plasticity coupling.
Table 7 the present invention manufacture experimently DC06 auto sheet mechanical property and with the contrast of relevant criterion
| ? | R p0.2,N/mm 2 | R m,N/mm 2 | A 80,% | r 90 | n 90 |
| GB | ≤170 | 270～330 | ≥41 | ≥2.1 | ≥0.22 |
| Europe superscript | ≤170 | 270～330 | ≥41 | ≥2.1 | ≥0.22 |
| The present invention | 123 | 315 | 42.7 | 3.10 | 0.24 |
Above-described embodiment is preferably embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (5)
1. a production method for automotive sheet, is characterized in that, comprising:
By molten steel by refining after continuous casting obtain slab, the chemical composition mass percent of described slab is: C:0.0005%; Si≤0.03%; Mn:0.09%-0.15%; P≤0.001%; S≤0.001%; Alt:0.038%-0.045%; Ti:0.06%-0.08%; N≤0.0014%; Surplus is Fe and trace element;
Described slab is heated, and Heating temperature is 1260-1300 ℃, and be 2.8-3.5 hour heat-up time;
Described slab is obtained to needed width of plate slab, through two roller roughing, four roller roughing, obtains intermediate blank again through fixed-width pressure machine;
Described intermediate blank is obtained to hot-rolled sheet by finish rolling;
Between roughing and finish rolling, enable stay-warm case, guarantee the homogeneity of intermediate blank temperature;
Described hot-rolled sheet is coiled into hot rolled coil after laminar flow is cooling, and the cooling employing leading portion of described laminar flow is cooling mode fast;
By described hot rolled coil, by the chill volume of cold rolling acquisition, the finishing temperature of described hot-rolled sheet is that 930 ± 20 ℃, coiling temperature are 770 ℃;
Described chill volume is processed and obtained band steel through continuous annealing, and then through the smooth finished product that coils into, when described chill volume is annealed by vertical continuous annealing furnace, in continuous annealing furnace, the temperature of each section is as shown in the table:
；
Described continuous annealing process speed is 180～250mpm.
2. the production method of automotive sheet as claimed in claim 1, is characterized in that, describedly by hot rolled coil, by the chill volume of cold rolling acquisition, is:
By hot rolled coil through straightening scale breading;
Hot rolled coil after straightening scale breading is removed to its scale on surface by continuous turbulent pickling, then through tandem mills, carry out the cold rolling chill volume of making.
3. the production method of automotive sheet as claimed in claim 2, is characterized in that:
Described hot rolled coil carries out when cold rolling, and cold rolling draft is 60～85%.
4. the production method of automotive sheet as claimed in claim 1, is characterized in that, described by chill volume process continuous annealing processing acquisition band steel, then the smooth finished product that coils into comprises:
Described chill volume is cleaned and removes its surface and oil contaminant through cleaning section;
Chill volume after described cleaning is carried out to anneal by vertical continuous annealing furnace and obtain band steel;
Described band steel is carried out smooth through levelling machine, then batch as finished product.
5. the production method of a kind of automotive sheet as claimed in claim 4, is characterized in that:
The smooth unit elongation of described levelling machine is controlled at 0.8 ± 0.2% according to belt steel thickness specifications vary.
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Application publication date: 20120725 Assignee: BEIJING SHOUGANG COLD ROLLING THIN PLATE CO., LTD. Assignor: Capital Iron & Steel General Company Contract record no.: 2015990001019 Denomination of invention: Steel plate for automobile and production method thereof Granted publication date: 20140115 License type: Common License Record date: 20151209 |
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