CN107653361A - A kind of preparation technology of deep processing autobody sheet - Google Patents
A kind of preparation technology of deep processing autobody sheet Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 238000012545 processing Methods 0.000 title abstract description 8
- 238000005516 engineering process Methods 0.000 title abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 71
- 239000010959 steel Substances 0.000 claims abstract description 71
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000002245 particle Substances 0.000 claims abstract description 19
- 238000005098 hot rolling Methods 0.000 claims abstract description 18
- 238000000137 annealing Methods 0.000 claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 16
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 35
- 238000001816 cooling Methods 0.000 claims description 35
- 238000005096 rolling process Methods 0.000 claims description 19
- 238000010438 heat treatment Methods 0.000 claims description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 229910052742 iron Inorganic materials 0.000 claims description 15
- 238000003723 Smelting Methods 0.000 claims description 14
- 238000005246 galvanizing Methods 0.000 claims description 12
- 238000010583 slow cooling Methods 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 10
- 238000009489 vacuum treatment Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000007747 plating Methods 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 6
- 238000005261 decarburization Methods 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 5
- 238000005097 cold rolling Methods 0.000 claims description 5
- 238000009749 continuous casting Methods 0.000 claims description 5
- 238000006477 desulfuration reaction Methods 0.000 claims description 5
- 230000023556 desulfurization Effects 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 238000005554 pickling Methods 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 abstract description 6
- 239000000956 alloy Substances 0.000 abstract description 6
- 239000013078 crystal Substances 0.000 abstract description 3
- 238000005457 optimization Methods 0.000 abstract description 3
- 238000005275 alloying Methods 0.000 abstract description 2
- 230000008859 change Effects 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract description 2
- 238000001556 precipitation Methods 0.000 abstract description 2
- 238000002844 melting Methods 0.000 abstract 2
- 230000008018 melting Effects 0.000 abstract 2
- 239000000463 material Substances 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- GHOKWGTUZJEAQD-ZETCQYMHSA-N (D)-(+)-Pantothenic acid Chemical class OCC(C)(C)[C@@H](O)C(=O)NCCC(O)=O GHOKWGTUZJEAQD-ZETCQYMHSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- GHOKWGTUZJEAQD-UHFFFAOYSA-N Chick antidermatitis factor Natural products OCC(C)(C)C(O)C(=O)NCCC(O)=O GHOKWGTUZJEAQD-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 229910000937 TWIP steel Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 1
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000003562 lightweight material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 229940055726 pantothenic acid Drugs 0.000 description 1
- 235000019161 pantothenic acid Nutrition 0.000 description 1
- 239000011713 pantothenic acid Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D15/00—Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D3/00—Electroplating: Baths therefor
- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/22—Electroplating: Baths therefor from solutions of zinc
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The present invention relates to a kind of preparation technology of deep processing autobody sheet, pass through the optimization of the step such as the continuous annealing to deep processing autobody sheet preparation technology, zinc-plated, melting, hot rolling and the adjustment of steel plate alloying component, the crystal structure of alloy is set to change, strengthen the precipitation of texture and tiny carbide, so as to improve armor plate strength.Inclusion content and particle size after control melting in strand, and the parameter of each process section of continuous annealing is finely controlled, obtain good combination property.Also, nanometer reinforcing phase is added in zinc-plated step, optimizes solution composition, surface of steel plate performance is further improved.
Description
Technical Field
The invention relates to the field of steel plate processing, in particular to a preparation process for a deep-processed automobile steel plate.
Background
70-80% of the automobile materials are steel materials, and represent the steel industry level of a country to a certain extent. China is synchronized with developed countries in the aspect of automobile technology level. With the continuous development of the automobile industry, the requirements on high-quality automobile steel are higher and higher, and the requirements are also higher and higher. Therefore, following the latest development trend of the automobile industry, the research and development of a new generation of automobile steel must become an important development direction of the basic research of the application of the steel industry in China. In the worldwide automobile industry, ultrahigh-strength steel plate materials are the focus of attention of the automobile industry worldwide at present. For deep-processing automobile steel plates, martensite steel and hot stamping forming steel are widely applied in the automobile industry, the tensile strength of the martensite steel is as high as 1500MPa, and the highest strength of the hot stamping forming steel can reach 1800MPa, so that the two high-strength steel can better meet the light weight requirement of automobiles, but for the two high-strength steel, the problems of surface decarburization and oxidation peeling can easily occur in a heating state, and the occurrence of the problems can directly influence the strength of the high-strength steel. High strength steels such as QP steel, TG steel, TWIP steel and the like are under investigation in addition to martensitic steels and hot press forming steels.
At present, the technical problems to be solved by deep processing of automobile steel plates are that besides better performance, lower production cost, individuality and special purpose of steel grades, the key points of particular attention are to optimize the production process to further refine the steel plates into fine grains, control the structure into fine grains and reduce the cost, further improve the forming performance of plates, improve the strength, reduce weight and save energy, optimize surface treatment to eliminate defects, improve the corrosion resistance, the painting property, the appearance and the like, and obtain a more durable service life under the condition of ensuring unchanged performance and process level.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a manufacturing process of a deep-processed steel sheet for an automobile, which can obtain a steel sheet for an automobile having grain refinement and having high strength and excellent surface properties. The method comprises the following specific steps:
the preparation process of the deep-processed automobile steel plate is characterized by comprising the following steps of: molten iron pretreatment, converter smelting, RH vacuum treatment, continuous casting, hot rolling, cold rolling, continuous annealing and galvanizing; wherein,
during the continuous annealing, the control parameters of each process section comprise: the preheating section is at 400-550 ℃, and the heating speed is 5-10 ℃/s; the heating section is 750-850 ℃, and the heating speed is 10-15 ℃/s; the soaking section is 800-900 ℃, and the soaking time is 300-500 s; the outlet temperature of the slow cooling section is 575-675 ℃, and the cooling speed of the slow cooling section is 2.5-10 ℃/s; the outlet temperature of the rapid cooling section is 400-450 ℃, and the cooling speed of the rapid cooling section is 50-100 ℃/s; the aging period is 350-400 ℃; the outlet temperature of the final cooling section is room temperature, and the cooling speed of the final cooling section is 10-20 ℃/s;
during galvanizing, the cathode current density is 5-10A/dm, the temperature is 30-50 ℃, the stirring speed is 200-400 r/min, and the plating solution contains 10-15 g/L of ZnO, 100-120 g/L of NaOH and nano SiC particles as a reinforcing phase.
The automobile steel plate comprises, by weight, not more than 0.005% of C, 0.20-0.35% of Si, 0.20-0.35% of Mn, 1.40-1.60% of Al, 0.50-0.80% of Zr, 0.10-0.50% of V, 0.10-0.50% of La, not more than 0.010% of P, not more than 0.010% of S, not more than 0.25% of Nb and the balance of Fe and inevitable impurities.
The yield strength of the automobile steel plate is 1000-1100 MPa, and the tensile strength of the automobile steel plate is 1500-1600 MPa.
Preferably, in the hot rolling process, the billet is heated to 1200-1250 ℃ and is kept warm for 1h, the hot rolling start rolling temperature is 1150 ℃, the thickness is 5mm after 6-pass rolling, the finish rolling temperature is above 900 ℃, the billet is curled at above 700 ℃, and then acid pickling is carried out.
Preferably, the molten iron pretreatment is that molten iron is subjected to pre-desulfurization, pre-dephosphorization and pre-decarburization before being smelted in a converter; after the converter smelting is matched with RH vacuum treatment, the content of C is controlled within 0.005 percent, and the content of S, P is controlled within 0.010 percent.
Preferably, the average particle size of the nano-SiC particles is about 50 nm.
The invention has the advantages that: through optimization of steps of continuous annealing, galvanizing, smelting, hot rolling and the like of the deep processing automobile steel plate preparation process and adjustment of steel plate alloy components, the crystal structure of the alloy is changed, the texture is strengthened, and fine carbides are precipitated, so that the strength of the steel plate is improved. The content of inclusions and the particle size in the casting blank after smelting are controlled, and the parameters of each process section of continuous annealing are finely controlled, so that good comprehensive performance is obtained. And moreover, a nano reinforcing phase is added in the galvanizing step, so that the components of the plating solution are optimized, and the surface performance of the steel plate is further improved.
Detailed Description
In order to realize the light weight of the automobile, the application of the light material is important. In the automobile industry, although the proportion of aluminum and plastic in automobile manufacturing is increasing, steel is still the main material for automobile manufacturing, so that the lightweight material of steel can better meet the requirement of automobile for light weight. The addition of a small amount of trace alloying elements to the steel sheet can increase the crystallization temperature of the steel sheet, so that the rolling work of the steel sheet can be easily completed at high temperature. The carbon nitrogen compound particles in the steel plate can be precipitated by adding a small amount of alloy elements, and the plasticity and good formability of the steel plate can be ensured while the strength of the steel plate is ensured.
The origin of non-metallic inclusions in steel is mainly in the refining process and the solidification process after tapping of the converter. In general, non-metallic inclusions are compounds of non-metallic elements carbon, nitrogen, sulfur, , oxygen in steel, wherein oxygen and sulfur compounds are the main ones, and they continuously change their composition, size, position and form in various processes before casting solidification. Inclusions can be classified into brittle inclusions, plastic inclusions and semi-plastic deformation according to their deformability. Wherein the plastic inclusions are elongated in the direction of the emulsion during the emulsion production, such as MnS, FeS, SiO2D, iso-salts of pantothenic acid; the semi-plastic inclusions being distributed in the form of chains during rolling, e.g. clustered Al2O3Etc.; the brittle inclusions being irregularly distributed during rolling because they do not plastically deform, e.g. Al2O3TiN, Ti (CN), MgO, silicate, spherical lead acid, etc. They can be classified into globular-point, cluster, block, dendritic sulfide, etc. according to the form of inclusions in the cast slab.
The present invention will be described in further detail with reference to examples and comparative examples.
Example 1:
the preparation process of the deep-processed automobile steel plate is characterized by comprising the following steps of: the method comprises the following steps of molten iron pretreatment, converter smelting, RH vacuum treatment, continuous casting, hot rolling, cold rolling, continuous annealing and galvanizing. In the hot rolling process, a billet is heated to 120 ℃ and is kept warm for 1h, the hot rolling start rolling temperature is 1150 ℃, the thickness is 5mm after 6 times of rolling, the finish rolling temperature is 900 ℃, the billet is curled at 700 ℃, and then acid pickling is carried out. The molten iron pretreatment is that molten iron is subjected to pre-desulfurization, pre-dephosphorization and pre-decarburization before being smelted in a converter; after the converter smelting is matched with RH vacuum treatment, the content of C is controlled within 0.005 percent, and the content of S, P is controlled within 0.010 percent. During the continuous annealing, the control parameters of each process section comprise: the preheating section is 400 ℃, and the heating speed is 5 ℃/s; the heating section is 750 ℃, and the heating speed is 10 ℃/s; the soaking section is 800 ℃, and the soaking time is 500 s; the outlet temperature of the slow cooling section is 575 ℃, and the cooling speed of the slow cooling section is 10 ℃/s; the outlet temperature of the fast cooling section is 400 ℃, and the cooling speed of the fast cooling section is 100 ℃/s; the aging period is 350 ℃; the outlet temperature of the final cooling section is room temperature, and the cooling speed of the final cooling section is 10 ℃/s. During the galvanization, the cathode current density is 5A/dm, the temperature is 30 ℃, the stirring speed is 400r/min, and the plating solution contains 10g/L of ZnO, 100g/L of NaOH and nano SiC particles as a reinforcing phase. The average particle diameter of the nano SiC particles is about 50 nm. The automobile steel plate comprises, by weight, 0.005% of C, 0.20% of Si, 0.20% of Mn, 1.60% of Al, 0.80% of Zr, 0.10% of V, 0.10% of La, less than or equal to 0.010% of P, less than or equal to 0.010% of S, 0.25% of Nb, and the balance of Fe and inevitable impurities. The yield strength of the automobile steel plate is 1000MPa, and the tensile strength of the automobile steel plate is 1500 MPa.
Example 2:
the preparation process of the deep-processed automobile steel plate is characterized by comprising the following steps of: the method comprises the following steps of molten iron pretreatment, converter smelting, RH vacuum treatment, continuous casting, hot rolling, cold rolling, continuous annealing and galvanizing. In the hot rolling process, a billet is heated to 1250 ℃ and is kept warm for 1h, the hot rolling start rolling temperature is 1150 ℃, the thickness is 5mm after 6 times of rolling, the finish rolling temperature is 920 ℃, the billet is curled at 720 ℃, and then acid pickling is carried out. The molten iron pretreatment is that molten iron is subjected to pre-desulfurization, pre-dephosphorization and pre-decarburization before being smelted in a converter; after the converter smelting is matched with RH vacuum treatment, the content of C is controlled within 0.005 percent, and the content of S, P is controlled within 0.010 percent. During the continuous annealing, the control parameters of each process section comprise: the preheating section is 550 ℃, and the heating speed is 5 ℃/s; the heating section is 850 ℃, and the heating speed is 10 ℃/s; the soaking section is 900 ℃, and the soaking time is 300 s; the outlet temperature of the slow cooling section is 675 ℃, and the cooling speed of the slow cooling section is 2.5 ℃/s; the outlet temperature of the fast cooling section is 450 ℃, and the cooling speed of the fast cooling section is 50 ℃/s; the aging period is 400 ℃; the outlet temperature of the final cooling section is room temperature, and the cooling speed of the final cooling section is 20 ℃/s. During the galvanization, the cathode current density is 10A/dm, the temperature is 50 ℃, the stirring speed is 200r/min, and the plating solution contains 15g/L of ZnO, 120g/L of NaOH and nano SiC particles as a reinforcing phase. The average particle diameter of the nano SiC particles is about 50 nm. The automobile steel plate comprises, by weight, 0.003% of C, 0.35% of Si, 0.35% of Mn, 1.60% of Al, 0.80% of Zr, 0.50% of V, 0.50% of La, less than or equal to 0.010% of P, less than or equal to 0.010% of S, 0.15% of Nb, and the balance of Fe and inevitable impurities. The yield strength of the automobile steel plate is 1100MPa, and the tensile strength of the automobile steel plate is 1600 MPa.
Example 3:
the preparation process of the deep-processed automobile steel plate is characterized by comprising the following steps of: the method comprises the following steps of molten iron pretreatment, converter smelting, RH vacuum treatment, continuous casting, hot rolling, cold rolling, continuous annealing and galvanizing. In the hot rolling process, a billet is heated to 1200 ℃ and is kept warm for 1h, the hot rolling start rolling temperature is 1150 ℃, the thickness is 5mm after 6-pass rolling, the finish rolling temperature is 930 ℃, the billet is curled at 710 ℃, and then acid pickling is carried out. The molten iron pretreatment is that molten iron is subjected to pre-desulfurization, pre-dephosphorization and pre-decarburization before being smelted in a converter; after the converter smelting is matched with RH vacuum treatment, the content of C is controlled within 0.005 percent, and the content of S, P is controlled within 0.010 percent. During the continuous annealing, the control parameters of each process section comprise: the preheating section is 450 ℃, and the heating speed is 8 ℃/s; the heating section is 800 ℃, and the heating speed is 12 ℃/s; the soaking period is 850 ℃, and the soaking time is 400 s; the outlet temperature of the slow cooling section is 600 ℃, and the cooling speed of the slow cooling section is 5 ℃/s; the outlet temperature of the fast cooling section is 430 ℃, and the cooling speed of the fast cooling section is 80 ℃/s; the aging section is 380 ℃; the outlet temperature of the final cooling section is room temperature, and the cooling speed of the final cooling section is 15 ℃/s. During the galvanization, the cathode current density is 8A/dm, the temperature is 40 ℃, the stirring speed is 300r/min, and the plating solution contains 12g/L of ZnO, 110g/L of NaOH and nano SiC particles as a reinforcing phase. The average particle diameter of the nano SiC particles is about 50 nm. The automobile steel plate comprises, by weight, 0.004% of C, 0.30% of Si, 0.25% of Mn, 1.50% of Al, 0.60% of Zr, 0.40% of V, 0.30% of La, less than or equal to 0.010% of P, less than or equal to 0.010% of S, 0.20% of Nb and the balance of Fe and inevitable impurities. The yield strength of the automobile steel plate is 1100MPa, and the tensile strength of the automobile steel plate is 1500 MPa.
Comparative example 1:
when the steel plate which is the same as the steel plate in the technical scheme of the invention is subjected to heat treatment which is different from the continuous annealing and galvanizing process of the invention, the automobile steel plate obtained by the heat treatment mode in the prior art cannot obtain the mechanical property and the surface property which are improved by the invention, the defects of thick microstructure, insufficient cleanliness, high production cost and the like exist, and the maximum yield strength and the tensile strength of the automobile steel plate cannot achieve the effect of the invention.
Comparative example 2:
the ingredients different from the preparation process of the invention are used as raw materials, especially when no rare earth element is added or the content ratio of Al, V and Nb elements is changed, larger Al is caused2O3And the inclusions can form inclusion belts in the rolling process, and the yield strength and the tensile strength of the obtained finished automobile steel plate are only 900MPa and 1000 MPa.
As can be seen from the examples 1-3 and the comparative examples 1-2, the invention changes the crystal structure of the alloy through the optimization of the steps of continuous annealing, galvanizing, smelting, hot rolling and the like of the preparation process of the deep-processing automobile steel plate and the adjustment of the alloy components of the steel plate, strengthens the texture and the precipitation of fine carbides, and further improves the strength of the steel plate. The content of inclusions and the particle size in the casting blank after smelting are controlled, and the parameters of each process section of continuous annealing are finely controlled, so that good comprehensive performance is obtained. And moreover, a nano reinforcing phase is added in the galvanizing step, so that the components of the plating solution are optimized, and the surface performance of the steel plate is further improved.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. The preparation process of the deep-processed automobile steel plate is characterized by comprising the following steps of: molten iron pretreatment, converter smelting, RH vacuum treatment, continuous casting, hot rolling, cold rolling, continuous annealing and galvanizing; wherein,
during the continuous annealing, the control parameters of each process section comprise: the preheating section is at 400-550 ℃, and the heating speed is 5-10 ℃/s; the heating section is 750-850 ℃, and the heating speed is 10-15 ℃/s; the soaking section is 800-900 ℃, and the soaking time is 300-500 s; the outlet temperature of the slow cooling section is 575-675 ℃, and the cooling speed of the slow cooling section is 2.5-10 ℃/s; the outlet temperature of the rapid cooling section is 400-450 ℃, and the cooling speed of the rapid cooling section is 50-100 ℃/s; the aging period is 350-400 ℃; the outlet temperature of the final cooling section is room temperature, and the cooling speed of the final cooling section is 10-20 ℃/s;
during galvanizing, the cathode current density is 5-10A/dm, the temperature is 30-50 ℃, the stirring speed is 200-400 r/min, and the plating solution contains 10-15 g/L of ZnO, 100-120 g/L of NaOH and nano SiC particles as a reinforcing phase.
2. The process according to claim 1, characterized in that: the automobile steel plate comprises, by weight, not more than 0.005% of C, 0.20-0.35% of Si, 0.20-0.35% of Mn, 1.40-1.60% of Al, 0.50-0.80% of Zr, 0.10-0.50% of V, 0.10-0.50% of La, not more than 0.010% of P, not more than 0.010% of S, not more than 0.25% of Nb and the balance of Fe and inevitable impurities.
3. The process according to claims 1-2, characterized in that: the yield strength of the automobile steel plate is 1000-1100 MPa, and the tensile strength of the automobile steel plate is 1500-1600 MPa.
4. The process according to claims 1 to 3, characterized in that: in the hot rolling process, a billet is heated to 1200-1250 ℃ and is kept warm for 1h, the hot rolling initial rolling temperature is 1150 ℃, the thickness is 5mm after 6 times of rolling, the final rolling temperature is above 900 ℃, the billet is curled at above 700 ℃, and then acid pickling is carried out.
5. The production process according to claims 1 to 5, characterized in that: the molten iron pretreatment is that molten iron is subjected to pre-desulfurization, pre-dephosphorization and pre-decarburization before being smelted in a converter; after the converter smelting is matched with RH vacuum treatment, the content of C is controlled within 0.005 percent, and the content of S, P is controlled within 0.010 percent.
6. The production process according to claims 1 to 5, characterized in that: the average particle diameter of the nano SiC particles is about 50 nm.
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