CN114525392A - Preparation method of titanium-carbon bistable carbon structural steel cold-rolled sheet - Google Patents
Preparation method of titanium-carbon bistable carbon structural steel cold-rolled sheet Download PDFInfo
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- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910000746 Structural steel Inorganic materials 0.000 title claims abstract description 14
- CYKMNKXPYXUVPR-UHFFFAOYSA-N [C].[Ti] Chemical compound [C].[Ti] CYKMNKXPYXUVPR-UHFFFAOYSA-N 0.000 title claims abstract description 9
- 238000002360 preparation method Methods 0.000 title claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 101
- 239000010959 steel Substances 0.000 claims abstract description 101
- 238000005096 rolling process Methods 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 31
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000009749 continuous casting Methods 0.000 claims abstract description 15
- 238000000137 annealing Methods 0.000 claims abstract description 14
- 238000005097 cold rolling Methods 0.000 claims abstract description 13
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 13
- 239000010936 titanium Substances 0.000 claims abstract description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910001562 pearlite Inorganic materials 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000001556 precipitation Methods 0.000 claims abstract description 7
- 150000004767 nitrides Chemical class 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 33
- 238000007670 refining Methods 0.000 claims description 33
- 229910052742 iron Inorganic materials 0.000 claims description 16
- 239000002893 slag Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 238000006477 desulfuration reaction Methods 0.000 claims description 12
- 230000023556 desulfurization Effects 0.000 claims description 12
- 229910000859 α-Fe Inorganic materials 0.000 claims description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 9
- 238000005554 pickling Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000003723 Smelting Methods 0.000 claims description 8
- 239000010960 cold rolled steel Substances 0.000 claims description 8
- 239000005997 Calcium carbide Substances 0.000 claims description 6
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 6
- 238000005275 alloying Methods 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 238000009792 diffusion process Methods 0.000 claims description 6
- 239000013072 incoming material Substances 0.000 claims description 6
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 claims description 6
- 239000011572 manganese Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000011575 calcium Substances 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 229910001200 Ferrotitanium Inorganic materials 0.000 claims description 3
- 229910000914 Mn alloy Inorganic materials 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 3
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 3
- 229910052681 coesite Inorganic materials 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 229910052906 cristobalite Inorganic materials 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 239000010436 fluorite Substances 0.000 claims description 3
- 239000004088 foaming agent Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 claims description 3
- 239000003607 modifier Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 238000011084 recovery Methods 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 229910052682 stishovite Inorganic materials 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 229910052905 tridymite Inorganic materials 0.000 claims description 3
- 230000007306 turnover Effects 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 8
- 238000005204 segregation Methods 0.000 abstract description 8
- 239000002245 particle Substances 0.000 abstract description 4
- 238000005728 strengthening Methods 0.000 abstract description 4
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 abstract description 2
- 238000005098 hot rolling Methods 0.000 abstract description 2
- 230000006911 nucleation Effects 0.000 abstract description 2
- 238000010899 nucleation Methods 0.000 abstract description 2
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 abstract description 2
- 230000001276 controlling effect Effects 0.000 description 10
- 238000003825 pressing Methods 0.000 description 5
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011257 shell material Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Classifications
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- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/003—Cementite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a method for preparing a titanium-carbon bistable carbon structural steel cold-rolled sheet, which takes titanium carbon and nitride as nucleation particles, reduces the center segregation of a sheet blank by continuous casting with low superheat degree and constant drawing speed, eliminates the center segregation of the sheet blank by hot charging and rolling, reduces the grade (less than or equal to 0.5 grade) of a hot-rolled steel strip, and completely eliminates the center segregation of the cold-rolled sheet by cold rolling and annealing. The precipitation strengthening of a small amount of titanium carbide formed by trace titanium, carbon and nitrogen, the precipitation strengthening of titanium nitride particles in the cooling process after hot rolling and after coiling, the strength of the material is improved, and the stress is eliminated through cold rolling and annealing, so that the high-strength, high-toughness and high-quality carbon structural steel cold-rolled plate is produced. The high-strength high-quality carbon structural cold-rolled sheet produced by the method has the tensile strength of 445MPa to 480 MPa; and the elongation after fracture is 29-36%. The steel structure is spherical pearlite, the grain size is 9-9.5 grade, the finished cold-rolled sheet metallographic structure is detected in batch, and the banded structure is completely eliminated.
Description
Technical Field
The invention relates to a preparation method of a titanium-carbon bistable carbon structural steel cold-rolled sheet, belonging to the fields of steel smelting and material processing.
Background
The high-toughness deep-drawing cold-rolled sheet is generally rolled by using low-carbon and low-silicon components, such as automobile panels, household electrical appliance plates and the like, and the content of [ C ] is less than or equal to 0.002 percent and the content of [ Si ] is less than or equal to 0.03 percent. The high-strength 25 # high-quality carbon structural steel cold-rolled sheet can be used as a high-quality bearing shell material, but the stamping forming performance is not as good as that of ultra-low carbon steel. The material has the main problems that cracking occurs in the forming process, the application field of the material is limited, and the material is difficult to use. And (3) document retrieval: (1) xinjiang iron & Steel, 2019, journal 2 issued "development of high-quality carbon structural steel cold-rolled steel sheet for steel caps" and the steel sheet comprises the following components: c: 0.25 to 28wt%, Si: 0.17-27 wt% wt%, Mn: 0.50-0.60 wt%, P: less than or equal to 0.015wt%, S: less than or equal to 0.0080 wt%, Al: 0.015 to 0.030wt%, Ca: 0.0008 to 0.0030 wt%. The cold-rolled steel strip with the thickness of 1.8-2.5 mm is produced, the tensile strength is 351-497MPa, the elongation after fracture is 24.5-31%, the steel structure is ferrite + spherical pearlite, and a 1.5-level banded structure exists. (2) production of 25-Steel Cold-rolled spheroidized annealed Steel strip published in 2002, 2 nd year, "spheroidized annealing test using a box-type electric furnace. The preheating treatment of the steel is added before the austenitizing heating, the flaky pearlite is cut off at the preheating temperature, and more fine carbide particles are formed. The preheating temperature is close to the A1 point (720 ℃), and the temperature of the steel strip is uniformly reached to the preheating temperature through longer preheating time. (3) Patent application number ZL 201810723750.X discloses a production method suitable for directly heating a high-quality carbon structural steel slab, and the method adopts a dynamic soft pressing device to eliminate center segregation of a 45 steel slab, so that the direct hot charging and rolling of the steel slab are realized.
Disclosure of Invention
The invention aims to provide a preparation method of a titanium-carbon bistable carbon structural steel cold-rolled plate, which can eliminate the phenomenon that the material has a banded structure due to carbon and manganese reinforcement, further influences the cold stamping forming performance of steel, is simple to produce, has strong applicability and operability, ensures the strength of the steel, and has excellent cold deep drawing performance.
A method for preparing a titanium-carbon bistable carbon structural steel cold-rolled sheet,
1) the cold-rolled sheet steel comprises the following components in percentage by mass: [C] the method comprises the following steps 0.27 to 0.29 wt%, Ti: 0.010-0.020 wt%, [ Mn ]: 0.55-0.65 wt%; si: 0.18-0.25 wt%, P: less than or equal to 0.015wt%, S: less than or equal to 0.004wt%, Al: 0.020-0.040 wt%, N: 0.0030-0.0045 wt%, Cu: less than or equal to 0.02wt%, Cr: less than or equal to 0.02wt%, Ni: less than or equal to 0.015wt%, and the balance of iron and inevitable impurities;
2) the production flow comprises the following steps: molten iron desulfurization pretreatment, smelting in a top-bottom combined blown converter, LF refining, slab continuous casting, strip steel hot continuous rolling, strip steel pickling, strip steel cold continuous rolling and strip steel heat treatment, wherein the thickness of the produced cold-rolled steel strip is 0.80-2.5 mm;
(1) carrying out deep desulfurization treatment on molten iron, carrying out KR desulfurization treatment, adding 5kg/t of desulfurizer, wherein the desulfurizer mainly comprises 80% of active lime and 20% of fluorite, adding the desulfurizer, stirring for 15min, and removing top slag of the molten iron tank, wherein [ S ] of the molten iron after desulfurization treatment is less than or equal to 0.002%;
(2) smelting in a converter, wherein [ S ] in waste steel is less than or equal to 0.015 percent, [ Cu ] is less than or equal to 0.05 percent, [ Cr ] is less than or equal to 0.05 percent, [ Ni ] is less than or equal to 0.05 percent, 0.03 percent, the content of [ C ] at the end point of the converter is 0.08-0.10 percent, the content of [ P ] is less than or equal to 0.010 percent, the temperature of molten steel tapped from the converter is controlled at 1630-1650 ℃, deoxidizing and alloying silicon-manganese alloy and aluminum-iron are adopted in the tapping process, 0.5 kg of aluminum is added into each ton of steel to semi-deoxidize the molten steel, the [ S ] in the molten steel in the ladle is less than or equal to 0.008 percent, the [ N ] is less than or equal to 0.0025 percent, slag in a furnace is tapped, and the amount of oxide slag in the ladle is less than or equal to 80 kg;
(3) the LF refining is performed by using ferrosilicon and calcium carbide for deoxidation and diffusion deoxidation, the addition amount of the calcium carbide is 1.5 kg/t steel, the addition amount of the ferrosilicon is 0.8-1.0 kg/t steel, the initial temperature of the LF refining is higher than 1530 ℃, the power transmission time of the LF refining of each furnace steel is not longer than 20min, the total time of LF refining treatment is controlled at 40-42 min, the nitrogen increase amount of molten steel in the LF refining process is less than 0.0010%, and the molten steel is stirred by argon bottom-blowing argon, wherein the flow rate is 15-20 NL/min; after LF treatment, feeding molten steel into a calcium-silicon wire for treatment, and after LF refining treatment, finishing the nitrogen content [ N ] of the molten steel]≤0.0035%、[S]≤0.0040%，[Ca]The content is controlled at0.0015-0.0035 percent, the other elements meet the control requirements of molten steel of a smelted finished product, and the final slag components of LF refining are as follows: CaO content of 50-53%, SiO2The content is about 12-15%, FeO is less than or equal to 1.0%, and Al2O328-32% of MgO, 8% of CaF2The content is not more than 5 percent, aluminum is forbidden to be used for precipitation deoxidation in the later stage of LF treatment, aluminum-containing diffusion deoxidizer or top slag modifier, accelerant and foaming agent are used for submerged arc refining, ferrotitanium is added in the last stage of LF refining for alloying, the recovery rate of titanium is more than 70 percent, and oxide inclusion and nitride inclusion of titanium are prevented from being generated;
(4) continuously casting a plate blank, wherein the thickness of the plate blank is 250mm, the width of the plate blank is 1250mm and 1500mm, and the length of the plate blank is 9.8 m; controlling the steel temperature at the LF refining end point according to the continuous casting superheat degree of 20 ℃, controlling the baking temperature of an empty ladle to be more than 1200 ℃, controlling the baking time to be more than 2.5h, controlling the temperature of the baked ladle to be more than 800 ℃, controlling the number of turnover ladle ladles to be not more than 4, and adding a high-alkalinity covering agent into a tundish to preserve the heat of molten steel, wherein the superheat degree of the continuous casting molten steel is 15 +/-5 ℃. For example, the slab width is 1250mm, the continuous casting slab drawing speed is 1.1m/min, and the slab width specification is set. Putting the plate blank into a plate blank pressing device in the continuous casting process, wherein the plate blank pressing amount is 5-6 mm, the center segregation level of the low-power plate blank is less than or equal to 1 level (Mannesmann standard), and the plate blank is subjected to hot conveying and hot charging rolling after being cut;
(5) the hot charging temperature of the plate blank is 680-740 ℃, the extraction temperature of the plate blank heating furnace is 1200 +/-15 ℃, water is sprayed to the upper surface and the lower surface of the plate blank discharged from the furnace by using a high-pressure water column with the pressure of 20MPa for descaling, the included angle between the water column and the surface of the plate blank is 15 ℃, the rough rolling starting temperature is 1160-1190 ℃, the rolling speed is 3.0-4.5 m/s, 7-pass rough rolling is carried out, and the thickness of a rough rolling middle steel plate is 40-43 mm; the finish rolling temperature is 880 +/-10 ℃, the hot rolled steel strip after finish rolling is subjected to structural transformation through laminar flow front-section weak cooling, the finish rolled steel strip after laminar cooling is coiled in a coiling machine at 675 +/-10 ℃, the steel coil is naturally air-cooled to room temperature, the metallographic structure of the steel plate is ferrite and pearlite, the grain size is 8.5 grade, and the maximum banded structure of the steel is 0.5 grade;
(6) the cold rolling method comprises the steps of pickling, cold continuous rolling and heat treatment, wherein firstly, pickling is carried out on an incoming hot rolled coil, then cold chain rolling is carried out, the cold rolling compression ratio is 50-55%, ferrite of the incoming hot rolled plate is elongated along the rolling direction through the cold chain rolling and plastically deforms, so that high-density dislocation is gathered in the ferrite, part of carbide body sheets are bent and broken, the interval between the pearlite sheets is reduced, the deformation instability of the carbide body sheets in the cold rolling process is increased, conditions are provided for the evolution of the carbide body in the annealing process, the incoming material thickness is 3.5mm, the incoming material is rolled into a cold rolled plate with the thickness of 1.6mm, then bright annealing is carried out on the cold rolled coil, the annealing temperature is +/-5 ℃, the heating time is 9.645 hours, the heat preservation time is 15 hours, and the covering time is 55 minutes.
The solution of banded structure of cold rolled steel sheet is to adopt bistable component design method of carbon and titanium, to use carbon and nitride of titanium as nucleation mass point, to reduce the central segregation of the sheet blank by continuous casting with low superheat degree and constant drawing speed, to eliminate the sheet blank by hot-charging rolling, to reduce the grade of hot rolled steel strip (less than or equal to 0.5 grade), and to eliminate the central segregation of cold rolled steel sheet by cold rolling annealing. The precipitation strengthening of a small amount of titanium carbide formed by trace titanium, carbon and nitrogen, the precipitation strengthening of titanium nitride particles in the cooling process after hot rolling and after coiling, the strength of the material is improved, and the stress is eliminated through cold rolling and annealing, so that the high-strength, high-toughness and high-quality carbon structural steel cold-rolled plate is produced. The high-strength high-quality carbon structural cold-rolled sheet produced by the method has the tensile strength of 445MPa to 480 MPa; and the elongation after fracture is 29-36%. The steel structure is spherical pearlite, the grain size is 9-9.5 grade, the finished cold-rolled sheet metallographic structure is detected in batch, and the banded structure is completely eliminated. The composition of the steel and the corresponding properties are shown in Table 1.
Remarking: the gauge length of the tensile property test sample is 50 mm.
The high-strength high-quality carbon structural steel cold-rolled steel produced by the method meets the user requirements on various properties, the thickness of the steel plate is 0.8-2.0 mm, the requirement is mainly that the thickness is 1.6mm, the problem of poor stamping forming performance caused by a steel plate material strip-shaped structure is completely solved, and batch supply is realized.
Detailed Description
A method for preparing a titanium-carbon bistable carbon structural steel cold-rolled sheet,
1) the cold-rolled sheet steel comprises the following components in percentage by mass: [C] the method comprises the following steps 0.27 to 0.29 wt%, Ti: 0.010-0.020 wt%, [ Mn ]: 0.55-0.65 wt%; si: 0.18-0.25 wt%, P: less than or equal to 0.015wt%, S: less than or equal to 0.004wt%, Al: 0.020-0.040 wt%, N: 0.0030-0.0045 wt%, Cu: less than or equal to 0.02wt%, Cr: less than or equal to 0.02wt%, Ni: less than or equal to 0.015wt%, and the balance of iron and inevitable impurities;
2) the production flow comprises the following steps: molten iron desulfurization pretreatment, smelting in a top-bottom combined blown converter, LF refining, slab continuous casting, strip steel hot continuous rolling, strip steel pickling, strip steel cold continuous rolling and strip steel heat treatment, wherein the thickness of the produced cold-rolled steel strip is 0.80-2.5 mm;
(1) carrying out deep desulfurization treatment on molten iron, carrying out KR desulfurization treatment, adding 5kg/t of desulfurizer, wherein the desulfurizer mainly comprises 80% of active lime and 20% of fluorite, adding the desulfurizer, stirring for 15min, and removing top slag of the molten iron tank, wherein [ S ] of the molten iron after desulfurization treatment is less than or equal to 0.002%;
(2) smelting in a converter, wherein [ S ] in waste steel is less than or equal to 0.015 percent, [ Cu ] is less than or equal to 0.05 percent, [ Cr ] is less than or equal to 0.05 percent, [ Ni ] is less than or equal to 0.05 percent, 0.03 percent, the content of [ C ] at the end point of the converter is 0.08-0.10 percent, the content of [ P ] is less than or equal to 0.010 percent, the temperature of molten steel tapped from the converter is controlled at 1630-1650 ℃, deoxidizing and alloying silicon-manganese alloy and aluminum-iron are adopted in the tapping process, 0.5 kg of aluminum is added into each ton of steel to semi-deoxidize the molten steel, the [ S ] in the molten steel in the ladle is less than or equal to 0.008 percent, the [ N ] is less than or equal to 0.0025 percent, slag in a furnace is tapped, and the amount of oxide slag in the ladle is less than or equal to 80 kg;
(3) the LF refining is performed by using ferrosilicon and calcium carbide for deoxidation and diffusion deoxidation, the addition amount of the calcium carbide is 1.5 kg/t steel, the addition amount of the ferrosilicon is 0.8-1.0 kg/t steel, the initial temperature of the LF refining is higher than 1530 ℃, the power transmission time of the LF refining of each furnace steel is not longer than 20min, the total time of LF refining treatment is controlled at 40-42 min, the nitrogen increase amount of molten steel in the LF refining process is less than 0.0010%, and the molten steel is stirred by argon bottom-blowing argon, wherein the flow rate is 15-20 NL/min; after LF treatment, feeding molten steel into a calcium-silicon line for treatment, and after LF refining treatment, finishing the nitrogen content [ N ] of the molten steel]≤0.0035%、[S]≤0.0040%，[Ca]The content is controlled at0.0015-0.0035 percent, the other elements meet the control requirements of molten steel of a smelted finished product, and the final slag components of LF refining are as follows: CaO content of 50-53%, SiO2The content of the Fe is about 12 to 15 percent, the FeO is less than or equal to 1.0 percent, and the Al2O328-32% of MgO, 8% of CaF2The content is not more than 5 percent, aluminum is forbidden to be used for precipitation deoxidation in the later stage of LF treatment, aluminum-containing diffusion deoxidizer or top slag modifier, accelerant and foaming agent are used for submerged arc refining, ferrotitanium is added in the last stage of LF refining for alloying, the recovery rate of titanium is more than 70 percent, and oxide inclusion and nitride inclusion of titanium are prevented from being generated;
(4) continuously casting a plate blank, wherein the thickness of the plate blank is 250mm, the width of the plate blank is 1250mm and 1500mm, and the length of the plate blank is 9.8 m; controlling the steel temperature at the LF refining end point according to the continuous casting superheat degree of 20 ℃, controlling the baking temperature of an empty ladle to be more than 1200 ℃, controlling the baking time to be more than 2.5h, controlling the temperature of the baked ladle to be more than 800 ℃, controlling the number of turnover ladle ladles to be not more than 4, and adding a high-alkalinity covering agent into a tundish to preserve the heat of molten steel, wherein the superheat degree of the continuous casting molten steel is 15 +/-5 ℃. For example, the slab width is 1250mm, the continuous casting slab drawing speed is 1.1m/min, and the slab width specification is set. Putting the plate blank into a plate blank pressing device in the continuous casting process, wherein the plate blank pressing amount is 5-6 mm, the center segregation level of the low-power plate blank is less than or equal to 1 level (Mannesmann standard), and the plate blank is subjected to hot conveying and hot charging rolling after being cut;
(5) the hot charging temperature of the plate blank is 680-740 ℃, the extraction temperature of the plate blank heating furnace is 1200 +/-15 ℃, water is sprayed to the upper surface and the lower surface of the plate blank discharged from the furnace by using a high-pressure water column with the pressure of 20MPa for descaling, the included angle between the water column and the surface of the plate blank is 15 ℃, the rough rolling starting temperature is 1160-1190 ℃, the rolling speed is 3.0-4.5 m/s, 7-pass rough rolling is carried out, and the thickness of a rough rolling middle steel plate is 40-43 mm; the finish rolling temperature is 880 +/-10 ℃, the hot rolled steel strip after finish rolling is subjected to structural transformation through laminar flow front-section weak cooling, the finish rolled steel strip after laminar cooling is coiled in a coiling machine at 675 +/-10 ℃, the steel coil is naturally air-cooled to room temperature, the metallographic structure of the steel plate is ferrite and pearlite, the grain size is 8.5 grade, and the maximum banded structure of the steel is 0.5 grade;
(6) the cold rolling method comprises the steps of pickling, cold continuous rolling and heat treatment, wherein firstly, pickling is carried out on an incoming hot rolled coil, then cold chain rolling is carried out, the cold rolling compression ratio is 50-55%, ferrite of the incoming hot rolled plate is elongated along the rolling direction through the cold chain rolling and plastically deforms, so that high-density dislocation is gathered in the ferrite, part of carbide body sheets are bent and broken, the interval between the pearlite sheets is reduced, the deformation instability of the carbide body sheets in the cold rolling process is increased, conditions are provided for the evolution of the carbide body in the annealing process, the incoming material thickness is 3.5mm, the incoming material is rolled into a cold rolled plate with the thickness of 1.6mm, then bright annealing is carried out on the cold rolled coil, the annealing temperature is +/-5 ℃, the heating time is 9.645 hours, the heat preservation time is 15 hours, and the covering time is 55 minutes.
Claims (1)
1. A preparation method of a titanium-carbon bistable carbon structural steel cold-rolled sheet is characterized by comprising the following steps:
1) the cold-rolled sheet steel comprises the following components in percentage by mass: [C] the method comprises the following steps 0.27 to 0.29 wt%, Ti: 0.010-0.020 wt%, [ Mn ]: 0.55-0.65 wt%; si: 0.18-0.25 wt%, P: less than or equal to 0.015wt%, S: less than or equal to 0.004wt%, Al: 0.020 to 0.040wt%, N: 0.0030-0.0045 wt%, Cu: less than or equal to 0.02wt%, Cr: less than or equal to 0.02wt%, Ni: less than or equal to 0.015wt%, and the balance of iron and inevitable impurities;
2) the production flow comprises the following steps: molten iron desulfurization pretreatment, smelting in a top-bottom combined blown converter, LF refining, slab continuous casting, strip steel hot continuous rolling, strip steel pickling, strip steel cold continuous rolling and strip steel heat treatment, wherein the thickness of the produced cold-rolled steel strip is 0.80-2.5 mm;
(1) carrying out deep desulfurization treatment on molten iron, carrying out KR desulfurization treatment, adding 5kg/t of desulfurizer, wherein the desulfurizer mainly comprises 80% of active lime and 20% of fluorite, adding the desulfurizer, stirring for 15min, and removing top slag of the molten iron tank, wherein [ S ] of the molten iron after desulfurization treatment is less than or equal to 0.002%;
(2) smelting in a converter, wherein [ S ] in waste steel is less than or equal to 0.015 percent, [ Cu ] is less than or equal to 0.05 percent, [ Cr ] is less than or equal to 0.05 percent, [ Ni ] is less than or equal to 0.05 percent, 0.03 percent, the content of [ C ] at the end point of the converter is 0.08-0.10 percent, the content of [ P ] is less than or equal to 0.010 percent, the temperature of molten steel tapped from the converter is controlled at 1630-1650 ℃, deoxidizing and alloying silicon-manganese alloy and aluminum-iron are adopted in the tapping process, 0.5 kg of aluminum is added into each ton of steel to semi-deoxidize the molten steel, the [ S ] in the molten steel in the ladle is less than or equal to 0.008 percent, the [ N ] is less than or equal to 0.0025 percent, slag in a furnace is tapped, and the amount of oxide slag in the ladle is less than or equal to 80 kg;
(3) the LF refining is performed by using ferrosilicon and calcium carbide for deoxidation and diffusion deoxidation, the addition amount of the calcium carbide is 1.5 kg/t steel, the addition amount of the ferrosilicon is 0.8-1.0 kg/t steel, the initial temperature of the LF refining is higher than 1530 ℃, the power transmission time of the LF refining of each furnace steel is not longer than 20min, the total time of LF refining treatment is controlled at 40-42 min, the nitrogen increase amount of molten steel in the LF refining process is less than 0.0010%, and the molten steel is stirred by argon bottom-blowing argon, wherein the flow rate is 15-20 NL/min; after LF treatment, feeding molten steel into a calcium-silicon wire for treatment, and after LF refining treatment, finishing the nitrogen content [ N ] of the molten steel]≤0.0035%、[S]≤0.0040%，[Ca]The content is controlled to be 0.0015-0.0035 percent, other elements all meet the control requirement of molten steel of a smelting finished product, and the final slag components of LF refining are as follows: CaO content of 50-53%, SiO2The content is about 12-15%, FeO is less than or equal to 1.0%, and Al2O328-32% of MgO, 8% of CaF2The content is not more than 5 percent, aluminum is forbidden to be used for precipitation deoxidation in the later stage of LF treatment, aluminum-containing diffusion deoxidizer or top slag modifier, accelerant and foaming agent are used for submerged arc refining, ferrotitanium is added in the last stage of LF refining for alloying, the recovery rate of titanium is more than 70 percent, and oxide inclusion and nitride inclusion of titanium are prevented from being generated;
(4) continuously casting a plate blank, wherein the thickness of the plate blank is 250mm, the width of the plate blank is 1250mm and 1500mm, and the length of the plate blank is 9.8 m; controlling the steel temperature at the LF refining end point according to the continuous casting superheat degree of 20 ℃, controlling the baking temperature of an empty ladle to be more than 1200 ℃, controlling the baking time to be more than 2.5h, controlling the temperature of the baked ladle to be more than 800 ℃, controlling the number of turnover ladle ladles to be not more than 4, and adding a high-alkalinity covering agent into a tundish to preserve the heat of molten steel, wherein the superheat degree of the continuous casting molten steel is 15 +/-5 ℃;
(5) the hot charging temperature of the plate blank is 680-740 ℃, the extraction temperature of the plate blank heating furnace is 1200 +/-15 ℃, water is sprayed to the upper surface and the lower surface of the plate blank discharged from the furnace by using a high-pressure water column with the pressure of 20MPa for descaling, the included angle between the water column and the surface of the plate blank is 15 ℃, the rough rolling starting temperature is 1160-1190 ℃, the rolling speed is 3.0-4.5 m/s, 7-pass rough rolling is carried out, and the thickness of a rough rolling middle steel plate is 40-43 mm; the finish rolling temperature is 880 +/-10 ℃, the hot rolled steel strip after finish rolling is subjected to structural transformation through laminar flow front-section weak cooling, the finish rolled steel strip after laminar cooling is coiled in a coiling machine at 675 +/-10 ℃, the steel coil is naturally air-cooled to room temperature, the metallographic structure of the steel plate is ferrite and pearlite, the grain size is 8.5 grade, and the maximum banded structure of the steel is 0.5 grade;
(6) the cold rolling method comprises the steps of pickling, cold continuous rolling and heat treatment, wherein firstly, pickling is carried out on an incoming hot rolled coil, then cold chain rolling is carried out, the cold rolling compression ratio is 50-55%, ferrite of the incoming hot rolled plate is elongated along the rolling direction through the cold chain rolling and plastically deforms, so that high-density dislocation is gathered in the ferrite, part of carbide body sheets are bent and broken, the interval between the pearlite sheets is reduced, the deformation instability of the carbide body sheets in the cold rolling process is increased, conditions are provided for the evolution of the carbide body in the annealing process, the incoming material thickness is 3.5mm, the incoming material is rolled into a cold rolled plate with the thickness of 1.6mm, then bright annealing is carried out on the cold rolled coil, the annealing temperature is +/-5 ℃, the heating time is 9.645 hours, the heat preservation time is 15 hours, and the covering time is 55 minutes.
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