CN111424213A - Low-carbon cold-rolled enamel steel and preparation method thereof - Google Patents
Low-carbon cold-rolled enamel steel and preparation method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 112
- 239000010959 steel Substances 0.000 title claims abstract description 112
- 210000003298 dental enamel Anatomy 0.000 title claims abstract description 63
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 58
- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- 238000005096 rolling process Methods 0.000 claims abstract description 45
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000000137 annealing Methods 0.000 claims abstract description 33
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 24
- 229910052742 iron Inorganic materials 0.000 claims abstract description 21
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- 238000010438 heat treatment Methods 0.000 claims abstract description 15
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- 238000005554 pickling Methods 0.000 claims abstract description 13
- 238000003723 Smelting Methods 0.000 claims abstract description 10
- 238000005266 casting Methods 0.000 claims abstract description 10
- 238000004321 preservation Methods 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 238000009749 continuous casting Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 238000006477 desulfuration reaction Methods 0.000 claims description 4
- 230000023556 desulfurization Effects 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 238000005097 cold rolling Methods 0.000 claims description 3
- 230000001914 calming effect Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims 4
- 239000012535 impurity Substances 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 18
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- 239000010936 titanium Substances 0.000 description 15
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- 229910001209 Low-carbon steel Inorganic materials 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 241000251468 Actinopterygii Species 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 229910052719 titanium Inorganic materials 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 239000011573 trace mineral Substances 0.000 description 3
- 235000013619 trace mineral Nutrition 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
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- 239000002893 slag Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
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- 239000011593 sulfur Substances 0.000 description 1
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- 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
- 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
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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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold 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
- C21D8/0273—Final recrystallisation annealing
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- 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
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- 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
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- 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
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- 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
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- 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
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- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention belongs to the technical field of steel process for enamel, and particularly relates to low-carbon cold-rolled enamel steel and a preparation method thereof. The preparation method comprises the following steps: providing molten iron, smelting in a converter, processing in an argon station, refining, continuously casting into a plate blank, heating the plate blank, hot continuous rolling, laminar cooling, coiling, acid pickling and cold continuous rolling, performing cover annealing and leveling; wherein, in the molten iron, P is less than or equal to 0.150 percent, and S is less than or equal to 0.06 percent; in the molten steel smelted by the converter, C is less than or equal to 0.050%, P is less than or equal to 0.012%, and S is less than or equal to 0.06%; the refined components comprise: c is more than or equal to 0.03 percent and less than or equal to 0.06 percent, Si is more than or equal to 0.05 percent, Mn is more than or equal to 0.1 percent and less than or equal to 0.5 percent, P is less than or equal to 0.02 percent, S is less than or equal to 0.015 percent, Al is more than or equal to 0.02 percent and less than or equal to 0.06 percent, Ti is more than or equal to 0.02 percent and less than or equal to 0.05 percent, and N is more than; in the hood annealing: the annealing temperature is 680-710 ℃, the heating rate is less than or equal to 60 ℃/h, the heat preservation time is more than or equal to 10h, the cooling rate is controlled to be less than or equal to 50 ℃/h, the cooling is controlled to be 450 ℃, and the tapping temperature is less than 100 ℃.
Description
Technical Field
The invention belongs to the technical field of steel process for enamel, and particularly relates to low-carbon cold-rolled enamel steel and a preparation method thereof.
Background
The common low-carbon cold-rolled enamel steel in the market at present usually adopts a method of adding B element to obtain a certain amount of BN precipitates to realize the fish scaling resistance of the steel plate, but the addition of B element can generate the following adverse effects on the quality of a product in the process: 1) a large amount of BN precipitates are formed at the continuous casting stage due to the addition of B element. When the conventional hot-rolling process is adopted for production, the steel plate blank is easy to have corner cracks, the steel plate blank can be normally produced only by grinding corners of the steel plate blank, the production cost is increased, the production efficiency of the steel plate is influenced, and meanwhile, the steel plate blank cannot adopt a hot-delivery hot-charging process due to the existence of the corner cracks, so that the reduction of energy consumption is also unfavorable; when the CSP continuous casting and rolling process is adopted, the defect of edge rotting of hot-rolled coils can also occur, the production needs to be carried out in a widening and cutting mode, and the yield and the product quality of steel are also influenced; 2) for the low-carbon steel added with B produced by adopting the bell-type furnace annealing process, because the addition of B changes the existing form and the existing state of C elements in the steel plate, the cold-rolled finished product with the specification of more than 1.5mm can also generate transverse fold defects (within 200 meters of the outer ring of each flat steel coil), thereby greatly reducing the product percent of pass and the order rate of cash and causing the production cost to be increased.
Therefore, the prior art is in need of improvement.
Disclosure of Invention
The invention aims to provide low-carbon cold-rolled enamel steel and a preparation method thereof, and aims to solve the technical problems that the existing low-carbon cold-rolled enamel steel is easy to produce corner cracks and edge decaying and is difficult to adapt to cover annealing.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a preparation method of low-carbon cold-rolled enamel steel on one hand, which comprises the following steps: providing molten iron, smelting in a converter, processing in an argon station, refining, continuously casting into a plate blank, heating the plate blank, hot continuous rolling, laminar cooling, coiling, acid pickling and cold continuous rolling, performing cover annealing and leveling; wherein,
in the molten iron, P is less than or equal to 0.150 percent, and S is less than or equal to 0.06 percent;
in the molten steel smelted by the converter, C is less than or equal to 0.050%, P is less than or equal to 0.012%, and S is less than or equal to 0.06%;
the refined components comprise: c is more than or equal to 0.03 percent and less than or equal to 0.06 percent, Si is more than or equal to 0.05 percent, Mn is more than or equal to 0.1 percent and less than or equal to 0.5 percent, P is less than or equal to 0.02 percent, S is less than or equal to 0.015 percent, Al is more than or equal to 0.02 percent and less than or equal to 0.06 percent, Ti is more than or equal to 0.02 percent and less than or equal to 0.05 percent, and N is more than;
in the hood annealing: the annealing temperature is 680-710 ℃, the heating rate is less than or equal to 60 ℃/h, the heat preservation time is more than or equal to 10h, the cooling rate is controlled to be less than or equal to 50 ℃/h, the cooling is controlled to be 450 ℃, and the tapping temperature is less than 100 ℃.
The preparation method of the low-carbon cold-rolled enamel steel provided by the invention has the advantages of low cost and short production period, the low-carbon cold-rolled enamel steel finally obtained through controlling the element content in the steps and a special cover-type annealing process has no edge rot and transverse crease, the mechanical property can meet the requirement of DC01EK delivery standard, the fish-scaling resistance can meet the use requirement of customers, the enamel adherence level is 1 or 2, and the preparation method has a good application prospect.
On the other hand, the invention provides low-carbon cold-rolled enamel steel which is obtained by the preparation method of the low-carbon cold-rolled enamel steel.
The low-carbon cold-rolled enamel steel provided by the invention is obtained by the preparation method of the low-carbon cold-rolled enamel steel, so that the low-carbon cold-rolled enamel steel has no broken edges and transverse wrinkles, the mechanical property can meet the requirement of DC01EK delivery standard, the fish scaling resistance can meet the use requirement of customers, the enamel adherence grade is 1 or 2, and the low-carbon cold-rolled enamel steel has a good application prospect.
Drawings
FIG. 1 is a CSP continuous casting and rolling flow chart in the preparation method of the low-carbon cold-rolled enamel steel of the invention;
FIG. 2 is a flow chart of acid pickling cold continuous rolling in the preparation method of the low-carbon cold-rolled enamel steel of the invention;
FIG. 3 is a flow chart of bell-type annealing and leveling in the preparation method of the low-carbon cold-rolled enamel steel of the invention;
FIG. 4 is a diagram of a water heater liner made of the low-carbon cold-rolled enamel steel.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a preparation method of low-carbon cold-rolled enamel steel on one hand, which comprises the following steps: providing molten iron, smelting in a converter, processing in an argon station, refining, continuously casting into a plate blank, heating the plate blank, hot continuous rolling, laminar cooling, coiling, acid pickling and cold continuous rolling, performing cover annealing and leveling; wherein,
in the molten iron, P is less than or equal to 0.150 percent, and S is less than or equal to 0.06 percent;
in the molten steel smelted by the converter, C is less than or equal to 0.050%, P is less than or equal to 0.012%, and S is less than or equal to 0.06%;
the refined components comprise: c is more than or equal to 0.03 percent and less than or equal to 0.06 percent, Si is more than or equal to 0.05 percent, Mn is more than or equal to 0.1 percent and less than or equal to 0.5 percent, P is less than or equal to 0.02 percent, S is less than or equal to 0.015 percent, Al is more than or equal to 0.02 percent and less than or equal to 0.06 percent, Ti is more than or equal to 0.02 percent and less than or equal to 0.05 percent, and N is more than;
in the hood annealing: the annealing temperature is 680-710 ℃, the heating rate is less than or equal to 60 ℃/h, the heat preservation time is more than or equal to 10h, the cooling rate is controlled to be less than or equal to 50 ℃/h, the cooling is controlled to be 450 ℃, and the tapping temperature is less than 100 ℃.
Specifically, in the low-carbon cold-rolled enamel steel obtained by the preparation method, the effective titanium [ Ti ] is less than or equal to 0.005%, and the calculation formula of the effective titanium is [ Ti ] ═ omega (Ti) -3.4 omega (N) -3 omega (S). If the effective titanium [ Ti ] is more than 0.005 percent or fluctuates greatly in the range of more than and less than 0.005 percent, the performance of the strip steel fluctuates greatly, so that the performance is unstable, therefore, the effective titanium [ Ti ] of the low-carbon cold-rolled enamel steel is less than or equal to 0.005 percent, the stability of the mechanical property can be well controlled, and the product requirements of customers are met.
After the low-carbon cold-rolled enamel steel is added with B, slab corner cracks or broken edges are easy to generate, and the low-carbon cold-rolled enamel steel is easy to cause wrinkle defects in the production of a bell-type furnace annealing process, namely has unsuitability for the bell-type annealing, so that the low-carbon enamel steel which is not easy to generate corner cracks and is suitable for the bell-type furnace production process is designed in the embodiment of the invention. Specifically, in the embodiment of the invention, by adopting the production method of adding the microalloy Ti element, controlling a certain amount of S, N content and controlling the cover annealing process, on the premise of ensuring that the mechanical property of the steel plate meets the DC01EK standard requirement, the hydrogen storage capacity of the steel plate is improved by forming TiN, TiS, Ti4C2S2 and TiC precipitates, so that the stamping forming property and the enamel fish scaling resistance of the steel plate can meet the use requirement; thereby avoiding the problems of increased production cost, prolonged production period and the like caused by slab cracks or broken edges and transverse fold defects of the steel plate.
The preparation method of the low-carbon cold-rolled enamel steel provided by the invention has the advantages of low cost and short production period, the low-carbon cold-rolled enamel steel finally obtained through controlling the element content in the steps and a special cover-type annealing process has no edge rot and transverse crease, the mechanical property can meet the requirement of DC01EK delivery standard, the fish-scaling resistance can meet the use requirement of customers, the enamel adherence level is 1 or 2, and the preparation method has a good application prospect.
Specifically, the preparation method of the low-carbon cold-rolled enamel steel provided by the embodiment of the invention sequentially comprises the following steps: providing molten iron → (KR desulfurization station) → converter smelting → argon station → refining → continuous casting of plate blank → plate blank heating → hot continuous rolling → laminar cooling → coiling → acid pickling and cold continuous rolling → cover annealing → leveling; finally, the materials are further rolled, inspected, packaged and put in storage.
In one embodiment, in order to reduce the difficulty of refining and desulfurization, shorten the processing time, ensure stable production rhythm and controlled quality, the phosphorus and sulfur content of the provided molten iron needs to be controlled, and specifically, the molten iron comprises the following components: p is less than or equal to 0.150 percent and S is less than or equal to 0.06 percent. If S in the molten iron is more than 0.060 percent, KR desulfurization can be carried out on the molten iron, and S is less than or equal to 003 percent when the molten iron is out of the station.
In one embodiment, the converter smelting is converter molten steel BOF smelting, the composition of the end point of the converter molten steel is controlled to be less than or equal to 0.050 percent of C, less than or equal to 0.012 percent of P and less than or equal to 0.06 percent of S, furthermore, the tapping temperature is controlled to be 1600-1680 ℃, the tapping time is greater than or equal to 2.5min, and the flow of bottom-blown argon is reduced to 600N L/min after 1min of converter tapping, so that the abnormal nitrogen increase of the molten steel can be reduced.
In one embodiment, in the argon station treatment, in order to ensure that the components are controlled, the bottom of the ladle does not chill steel, the self-opening rate of the ladle is improved, and the generation of quality defects is reduced, the following conditions are further controlled, wherein the carbon of the ① argon station is controlled to be less than or equal to 0.045%, and the temperature of the ② argon station is greater than or equal to 1550 ℃.
In one embodiment, the refining is L F molten steel refining treatment, and the refined components comprise 0.03-0.06% of C, 0.05% of Si, 0.1-0.5% of Mn, 0.02% of P, 0.015% of S, 0.02-0.06% of Al, 0.02-0.05% of Ti and 0.004-0.01% of N, and further L F molten steel refining treatment conditions are that the soft blowing time of ① L F furnace refining is more than or equal to 6min, the calming time is more than or equal to 12min, the continuous casting station temperature of ② is 1565-1590 ℃, the casting station temperature is 1575-1590 ℃, the Ca content of ③ is controlled to 0.0015-0.0035%, the refining components of ④ are 0.03-0.06% of C, 0.05% of Si, 0.1-0.5% of Mn, 0.02% of P, 0.015-0.06% of S, 0.02% of Al and 0.05-0.05% of N.
The CSP continuous casting and rolling process is shown in figure 1: after the molten steel is subjected to preliminary rough smelting (converter) and refining treatment, the width specification of the molten steel is fixed by a thin slab caster, a hot slab directly enters a tunnel furnace for heat preservation and heating, the hot slab is subjected to dephosphorization after being discharged from the furnace and then enters a finishing mill group, and laminar cooling is carried out after being discharged from the mill, and then the molten steel is coiled into a steel coil.
In one embodiment, in the continuous casting of the plate blank, the temperature of ① continuous casting tundish is 1545-1570 ℃, the casting blank drawing speed is ② which is not less than 3.6m/min, the variation is reduced after the casting starting is stabilized, and the defects of slag entrapment and the like caused by the change of high drawing speed are prevented.
In one embodiment, in slab heating, the slab entry temperature: not less than 950 ℃.
The main purpose of hot continuous rolling is to roll a thicker intermediate blank into a thinner coil of steel, thereby conforming to the required thickness of the cold rolled stock. Since the hot rolling reduction is very large and the rolling in a normal cold state cannot be realized, it is necessary to soften the intermediate slab at a certain temperature to reduce the rolling force to facilitate the rolling. The heating temperature setting is mainly determined by the temperature drop from the heating furnace to the finish rolling temperature point, and the finish rolling temperature is ensured to be rolled according to the set temperature; the setting of the finishing rolling temperature mainly ensures that the finishing rolling temperature cannot be lower than the austenite transformation temperature; the setting of the coiling temperature mainly depends on the advantages and disadvantages of the mechanical properties of the material. In one embodiment, in the hot continuous rolling, the temperature of the FET (finish rolling inlet temperature) is 1050-1150 ℃; the temperature of FDT (outlet temperature of finish rolling, namely finishing temperature) is 880-920 ℃; dephosphorization water pressure: the front section is more than or equal to 200bar, and the rear section is more than or equal to 300 bar.
In one embodiment, laminar flow cooling is preceded by concentrated cooling.
In one embodiment, the coiling temperature: 590 to 630 ℃.
The pickling cold continuous rolling process is shown in fig. 2, a hot rolled steel coil is uncoiled by an uncoiler, the uncoiled hot rolled steel coil enters a flash welding machine to be welded with a previous coil of steel to realize continuous rolling, the hot rolled steel coil enters a withdrawal and straightening unit to be descaled and break iron scales on the surface of hot rolled steel strips through a loop (different production rhythms before and after the action of the loop is connected), the descaled steel plates enter a pickling unit to remove the iron scales on the surface of the steel plates, then enter a disc shear to shear the edges of the steel plates and enter the loop, and the steel plates after being taken out of the loop enter a rolling mill to be rolled to the thickness of an order and. The main purpose of pickling cold continuous rolling is to remove the scale on the surface of the steel plate and simultaneously roll a thicker hot rolled plate into a thinner cold rolled plate. The rolling reduction rate is considered on the one hand, the rolling mill function is considered on the other hand, the rolling reduction rate is considered on the other hand, and the optimal rolling reduction rates of different steel types are different.
In one embodiment, the relative reduction of acid pickling cold continuous rolling to cold rolling is greater than or equal to 50%. For cold-rolled low-carbon steel plates, the formability is optimal when the cold rolling reduction is generally 75%. However, any unit has a limit to the thickness of the inlet substrate and cannot exceed the mill load.
The main purpose of annealing is to eliminate work hardening generated in the pickling cold continuous rolling process and to fully recrystallize the steel sheet. The most critical parameters are annealing temperature and holding time, and the parameter setting is mainly based on whether the performance of the annealing material meets the requirement of delivery standard. And the tapping temperature mainly avoids the oxidation of the high-temperature tapping steel plate. In one embodiment, the cover annealing is carried out in a cover furnace, the annealing temperature is 680-710 ℃, the heating rate is less than or equal to 60 ℃/h, the heat preservation time is more than or equal to 10h, the cooling rate is controlled to be less than or equal to 50 ℃/h, the cooling is controlled to be 450 ℃, and the tapping temperature is less than 100 ℃. By the annealing process, the steel plate can be completely recrystallized, the performance meets delivery requirements, and the surface of the steel plate after being discharged from the furnace has no defect of poor oxidation color.
In one embodiment, the flat elongation is set to 1.2 to 1.6%. The main function of the flattening process is to eliminate the yield plateau (the steel plate with the yield plateau has the defect of tensile strain marks when stamping automobile parts). The setting of the technological parameters mainly takes the elimination of the yield platform as the reference, and the yield strength control range can be adjusted and decreased appropriately on the basis.
The annealing and leveling process is shown in fig. 3, the steel plate after acid rolling has high strength and low plasticity, and the steel coil after acid rolling is transferred into an annealing furnace for annealing, so that the work hardening of the steel plate after acid rolling is eliminated, the steel plate structure is recovered and recrystallized, and the steel plate has the processing and forming performance. The annealed steel plate needs to be subjected to flattening treatment, and the flattening treatment mainly aims to eliminate a yield platform of the steel plate and avoid the tensile strain mark defect of a customer in the stamping process. Then the steel coil enters a rewinding line to be oiled and split, and the large steel coil is split into small steel coils.
In conclusion, if the B-added low-carbon steel is adopted to produce the hot-rolled steel coil with the edge-rotting ratio reaching about 40% in the CSP continuous casting and rolling production line, the embodiment of the invention adopts the Ti-added cold-rolled low-carbon steel with the edge-rotting ratio of 0%; if the low-carbon steel added with B is produced by a cover annealing process, the proportion of the transverse fold lines generated by the product reaches more than 35% according to the statistics of a large coil, while the proportion of the transverse fold lines of the cold-rolled low-carbon steel added with Ti is 0%. The mechanical properties of the finally obtained low-carbon cold-rolled enamel steel are as follows: rp 0.2: 220-280 MPa, Rm: 350-400 MPa, A is more than or equal to 40 percent, and the requirement of DC01EK delivery standard can be met (the standard requirement is that Rp0.2 is less than or equal to 280MPa, Rm is 270-410 MPa, and A is more than or equal to 30 percent); the fish-scaling resistance can meet the use requirements of customers, and the enamel adherence grades are 1 and 2, so that the requirements are met.
On the other hand, the embodiment of the invention also provides the low-carbon cold-rolled enamel steel, and the low-carbon cold-rolled enamel steel is obtained by the preparation method of the low-carbon cold-rolled enamel steel.
The low-carbon cold-rolled enamel steel provided by the embodiment of the invention is obtained by the preparation method of the low-carbon cold-rolled enamel steel, so that the low-carbon cold-rolled enamel steel has no edge rot and transverse crease, the mechanical property can meet the requirement of DC01EK delivery standard, the fish scaling resistance can meet the use requirement of customers, the enamel adherence grade is 1 or 2, and the low-carbon cold-rolled enamel steel has a good application prospect.
Specifically, the low-carbon cold-rolled enamel steel comprises the following chemical components in percentage by weight, wherein the chemical components are calculated according to the mass percentage of 100 percent: 0.03-0.06 Wt%; si: 0-0.05 Wt%; 0.10-0.50 Wt% of Mn; 0-0.02 Wt% of P; s: 0.000-0.015 Wt%; 0.020-0.060 Wt% of Al; 0.02-0.05 Wt% of Ti; 0.004-0.010 Wt% of N; the balance of iron and inevitable trace elements.
The invention is described in further detail with reference to a part of the test results, which are described in detail below with reference to specific examples.
Example 1
The apparatus or device or component of this embodiment is shown in table 1:
TABLE 1
The codes of the low-carbon cold-rolled enamel steel products of the present example in each step are shown in table 2.
TABLE 2
Process parameters
(1) Smelting molten steel in a converter: tapping C is controlled to be 0.047%/0.0359%, and carbon in an argon station is controlled to be 0.0388%/0.0352%; controlling the tapping temperature at 1624/1634 ℃;
(2) l F refining treatment, wherein the outlet temperature is 1575/1578 ℃, the soft blowing time is 10min, and the nitrogen content is 0.0052%/0.0047% respectively;
(3) slab continuous casting: the tundish temperature is 1550/1560 ℃, the drawing speed is 3.8m/min, and low-carbon steel casting powder is adopted;
(4) conventional hot continuous rolling: see table 3:
TABLE 3
| Scroll number | FDT | CT |
| 9490091300 | 903 | 611 |
| 9490091000 | 902 | 610 |
| 9490091200 | 904 | 610 |
| 9490090900 | 904 | 609 |
| 9490091500 | 903 | 612 |
| 9490091400 | 903 | 612 |
| 9490091600 | 902 | 610 |
| 9490091800 | 905 | 612 |
(5) Acid pickling and cold continuous rolling: see table 4:
TABLE 4
| Number rolled by acid | Reduction rate of acid rolling |
| A902577900 | 61.16％ |
| A902577600 | 61.18％ |
| A902577800 | 61.17％ |
| A902577500 | 61.18％ |
| A902578100 | 61.16％ |
| A902578000 | 61.16％ |
| A902578200 | 61.16％ |
| A902746900 | 61.18％ |
(6) Annealing in a bell-type furnace: see table 5:
TABLE 5
| Rate of heating | Annealing temperature | Time of heat preservation | Rate of cooling | Controlling the cooling temperature | Tapping temperature |
| 40℃/h | 700 | 12h | 50℃/h | 450℃ | 70℃ |
(7) Leveling: the elongation is 1.6%.
The low-carbon cold-rolled enamel steel finally obtained by the process parameters comprises the following chemical components:
furnace number 9114375: c: 0.0523 Wt%; si: 0.0225 Wt%; mn: 0.244 Wt%; p: 0.0106 Wt%; s: 0.0043 Wt%; al: 0.0313 Wt%; ti: 0.0295 Wt%; n: 0.0045 Wt%; the balance of iron and inevitable trace elements.
Furnace number 9114376: c: 0.0425 Wt%; si: 0.0304 Wt%; mn: 0.230 Wt%; p: 0.0098 Wt%; s: 0.0042 Wt%; al: 0.0265 Wt%; ti: 0.0345 Wt%; n: 0.0047 Wt%; the balance of iron and inevitable trace elements.
Example 2
The low-carbon cold-rolled enamel steel with the thickness of more than 1.5mm is applied to the industry of water heater liners and is mainly applied to barrel bodies and end enclosure parts of the water heater liners.
The application mode is as follows: the manufacturing of the barrel body of the water heater inner container is mainly finished through plate shearing, punching and welding processes; the air head of the water heater inner container is manufactured mainly by blanking, punch forming and technology; and then welding the barrel body part and the end enclosure part, and then carrying out sand blasting and enamel processing, thereby finishing the manufacture of the liner of the water heater.
The following table 6 shows an application example of the product on the inner container of the water heater, and a stamping process flow: blanking → drawing (rolling) → welding → sandblasting → enameling. The resulting water heater liner is shown in fig. 4.
TABLE 6
| Material brand | Name of part | Size of material |
| DC01EK | End socket | 1.8X 408 (round piece) |
| DC01EK | Barrel body | 1.8*1062*521 |
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The preparation method of the low-carbon cold-rolled enamel steel is characterized by comprising the following steps: providing molten iron, smelting in a converter, processing in an argon station, refining, continuously casting into a plate blank, heating the plate blank, hot continuous rolling, laminar cooling, coiling, acid pickling and cold continuous rolling, performing cover annealing and leveling; wherein,
in the molten iron, P is less than or equal to 0.150 percent, and S is less than or equal to 0.06 percent;
in the molten steel smelted by the converter, C is less than or equal to 0.050%, P is less than or equal to 0.012%, and S is less than or equal to 0.06%;
the refined components comprise: c is more than or equal to 0.03 percent and less than or equal to 0.06 percent, Si is more than or equal to 0.05 percent, Mn is more than or equal to 0.1 percent and less than or equal to 0.5 percent, P is less than or equal to 0.02 percent, S is less than or equal to 0.015 percent, Al is more than or equal to 0.02 percent and less than or equal to 0.06 percent, Ti is more than or equal to 0.02 percent and less than or equal to 0.05 percent, and N is more than;
in the hood annealing: the annealing temperature is 680-710 ℃, the heating rate is less than or equal to 60 ℃/h, the heat preservation time is more than or equal to 10h, the cooling rate is controlled to be less than or equal to 50 ℃/h, the cooling is controlled to be 450 ℃, and the tapping temperature is less than 100 ℃.
2. The method for preparing low carbon cold rolled enamel steel as claimed in claim 1, wherein if S is more than 0.060% in the molten iron provided, S is made to be 003% or less by KR desulfurization treatment.
3. The preparation method of the low-carbon cold-rolled enamel steel as claimed in claim 1, wherein in the converter smelting, the tapping temperature is 1600-1680 ℃, the tapping time is more than or equal to 2.5min, and the flow of bottom-blown argon is reduced to 600N L/min after tapping for 1 min.
4. The method for preparing the low-carbon cold-rolled enamel steel as claimed in claim 1, wherein in the argon station treatment, the carbon is controlled to be less than or equal to 0.045%, and the argon station temperature is greater than or equal to 1550 ℃.
5. The method for preparing the low-carbon cold-rolled enamel steel as claimed in claim 1, wherein in the refining, the soft blowing time is more than or equal to 6min, and the calming time is more than or equal to 12 min; the continuous casting outlet temperature is 1565-1590 ℃, and the casting starting outlet temperature is 1575-1590 ℃; and/or the presence of a gas in the gas,
the content of Ca is controlled between 0.0015 percent and 0.0035 percent.
6. The preparation method of the low-carbon cold-rolled enamel steel as claimed in claim 1, wherein the temperature of a continuous casting tundish in the continuous casting of the continuous casting plate blank is 1545-1570 ℃; the casting blank drawing speed is more than or equal to 3.6m/min, and the drawing speed fluctuation range is +/-0.1 m/min.
7. The preparation method of the low-carbon cold-rolled enamel steel as claimed in claim 1, wherein in the hot continuous rolling, the FET temperature is 1050-1150 ℃; the temperature of the FDT is 880-920 ℃; and/or the presence of a gas in the gas,
dephosphorization water pressure: the front section is more than or equal to 200bar, and the rear section is more than or equal to 300 bar.
8. The method for preparing the low-carbon cold-rolled enamel steel as claimed in claim 1, wherein the cold rolling relative reduction rate in the pickling cold continuous rolling is not less than 50%.
9. A low carbon cold rolled enamel steel, characterized in that it is obtained by the method for the preparation of a low carbon cold rolled enamel steel according to any one of claims 1 to 8.
10. The low-carbon cold-rolled enamel steel as claimed in claim 9, wherein said low-carbon cold-rolled enamel steel comprises, in 100% by mass of chemical composition of said low-carbon cold-rolled enamel steel: c: 0.03-0.06 Wt%; si: 0-0.05 Wt%; mn: 0.10-0.50 Wt%; p: 0-0.02 Wt%; s: 0.000-0.015 Wt%; al: 0.020-0.060 Wt%; ti: 0.02-0.05 Wt%; n: 0.004-0.010 Wt%; the balance of iron and inevitable impurities.
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| CN114657348A (en) * | 2021-11-26 | 2022-06-24 | 安阳钢铁股份有限公司 | Production method of low-carbon cold-rolled enamel steel with high fishscale resistance |
| CN116254463A (en) * | 2022-08-17 | 2023-06-13 | 湖南华菱涟源钢铁有限公司 | Low-carbon boron-added enamel steel and production method thereof |
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| CN109943779A (en) * | 2019-04-30 | 2019-06-28 | 马鞍山钢铁股份有限公司 | A kind of enamel low-carbon cold rolling steel plate and its production method |
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| KR20140055468A (en) * | 2012-10-31 | 2014-05-09 | 현대제철 주식회사 | Cold-rolled steel sheet for enamel and method of manufacturing the same |
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| CN114657348B (en) * | 2021-11-26 | 2023-12-29 | 安阳钢铁股份有限公司 | Production method of low-carbon cold-rolled enamel steel with high anti-scaling performance |
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