CN108425069B - Hot-dip plated steel plate with excellent heat resistance and high-temperature oxidation resistance and production method thereof - Google Patents
Hot-dip plated steel plate with excellent heat resistance and high-temperature oxidation resistance and production method thereof Download PDFInfo
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- 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
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- 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
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/12—Aluminium or alloys based thereon
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- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
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- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
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Abstract
The invention provides a hot dip coating steel plate with excellent heat resistance and high temperature oxidation resistance and a production method thereof, wherein a substrate comprises the following components in percentage by weight: less than or equal to 0.25 percent; si: less than or equal to 0.080 percent; mn is more than or equal to 0.10 percent and less than or equal to 1.20 percent; p: less than or equal to 0.020%; s: less than or equal to 0.015 percent; al: 0.020% -0.055%; n: less than or equal to 0.0050 percent; ti: less than or equal to 0.10 percent; nb: less than or equal to 0.10 percent, and the balance of Fe and inevitable impurities. The plating layer contains 3 to 5 percent of Si, 1.0 to 3.0 percent of Fe, 0.05 to 0.2 percent of La, 0.05 to 0.2 percent of Mg, and the balance of Al and a small amount of inevitable impurities. Compared with the prior art, the hot-dip aluminum-plated silicon steel plate with excellent heat resistance and high-temperature oxidation resistance is produced by controlling the substrate components, the annealing process, the plating solution components, the dip plating process and the like of the aluminum-plated silicon steel plate.
Description
Technical Field
The invention belongs to the technical field of steel plate hot dip coating processing, and relates to a steel plate with an excellent heat-resistant and high-temperature oxidation-resistant hot dip coating and a production method thereof.
Background
Because the service life of cold-rolled steel sheets and galvanized steel sheets is low in a high-temperature state, the surfaces of the steel sheets are oxidized after being used for years generally, which is not good for health, and the service limit working temperature of the galvanized steel sheets is 230 ℃. The aluminum-plated steel plate can resist the high temperature of 600 ℃, has strong oxidation resistance and corrosion resistance, prolongs the service life by 60 percent compared with galvanized steel, and is widely applied to the high-temperature resistant fields of gas parts, ovens and the like.
When the working temperature of the aluminum-plated steel plate is lower than 450 ℃, the steel plate can keep bright appearance, and oxidation and discoloration do not begin until the temperature is higher than 500 ℃. Therefore, the aluminum-plated steel sheet can be used in a high-temperature working environment, has heat resistance equivalent to 13Cr stainless steel, and begins to soften to 700 ℃. The high-temperature oxidation resistance of the aluminized carbon steel is equal to that of stainless steel, the heat resistance can be improved by nearly one hundred times, and the maximum use temperature of various steels before and after aluminizing is greatly improved.
The aluminum-plated steel plate has excellent heat resistance and high-temperature oxidation resistance, and is made of an iron-aluminum alloy formed by specific combination of a substrate and a plating structure, so that the steel plate has excellent high-temperature resistance.
Due to the excellent heat resistance and high-temperature oxidation resistance of the aluminum-plated steel sheet, the aluminum-plated steel sheet is widely applied to fields with high requirements on heat resistance: ovens, barbecue grills, deep fryers, toaster ovens, burner exhausts, insulation units, and the like.
A heat-resistant steel plate and a preparation process thereof are disclosed in Chinese patent No. 201410739819.X, wherein a precoated steel plate is coated and baked in sequence by adopting a base coating and a surface coating, wherein the base coating and the surface coating are prepared by taking organic silicon modified polyester resin as a base material of a coating composition and adding other auxiliary agents.
Chinese patent No. 201510027633.6 entitled "Heat-resistant Steel plate for Power station boiler and manufacturing method thereof" describes a method for producing a heat-resistant stainless steel plate. The steel plate comprises the following components in percentage by mass: c:0.08 to 0.12, Si: 0.15 to 0.45, Mn: 0.35-0.55, P: less than or equal to 0.013, S: less than or equal to 0.005, Cr: 8.60-8.90, Mo: 0.31 to 0.50, V: 0.16-0.22, W: 1.55-1.85, Nb: 0.045-0.085, N: 0.045-0.065, B: 0.002-0.004, Ni: 0.20-0.35, Al is more than 0 and less than or equal to 0.01, and O is more than 0 and less than or equal to 20 ppm. The manufacturing method comprises the following steps in sequence; preparing a blank: casting a continuous casting blank; annealing: the annealing temperature is 740 +/-10 ℃; carrying out hot grinding; heating a steel billet: the heating temperature is 1230 +/-10 ℃; v, rolling: the initial rolling temperature of rough rolling is 1160-1200 ℃, and the final rolling temperature of finish rolling is 860-900 ℃; VI, hot straightening; VII, normalizing: normalizing at 1050 +/-10 ℃; VIII tempering: the tempering temperature is 780 +/-10 ℃, and the steel plate is discharged from the furnace and cooled in air after heat preservation.
The steel plate with excellent heat resistance and high temperature oxidation resistance, which is widely applied at present, is mainly coated with high temperature resistant paint on the surface of the steel plate and is made of high temperature resistant stainless steel.
China patent No. 201110179923.4 entitled "aluminum-plated silicon steel sheet for Hot Press Molding and method for manufacturing the same" describes that a hot-formed steel sheet is subjected to a pre-oxidation treatment in an NOF furnace and then passed through a high-Hydrogen atmosphere (H) in a reduction furnace220 to 50 percent of N and the balance of N2) And reducing at low dew point (the dew point in the furnace is controlled between minus 20 ℃ and minus 60 ℃) to produce the aluminum-plated silicon steel plate for hot-press forming. The chemical component requirements are (by mass): 0.08 to 0.3 percent of C, 0.10 to 1.5 percent of Si, 0.2 to 3.0 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.004 percent of S, 0.016 to 0.040 percent of Al, 0.1 to 0.9 percent of Cr, 0.01 to 0.2 percent of Ti, 0.0001 to 0.005 percent of B, less than or equal to 0.005 percent of N, and the balance of Fe and inevitable impurities. The patent substrate is made of hot forming steel, the hydrogen content of the reduction section of the annealing furnace is high, and great potential safety hazards exist in industrial production. In addition, the steel plate is rapidly cooled at a temperature of more than or equal to 120 ℃/s between the leading-out of the aluminum pot and the solidifying point of the aluminum-silicon alloy so as to control the growth of an alloy layer, the cooling rate is high, and the feasibility is not realized in the actual production.
In the production method of a continuous hot-dip aluminum silicon titanium boron alloy plated steel plate with the Chinese patent number of 201110399806.9 and the production method of a continuous hot-dip aluminum silicon copper magnesium alloy plated steel plate with the Chinese patent number of 200910231746.2, by adding a small amount of Ti, B, Cu and Mg to an aluminum silicon plating solution, the cost is increased compared with the addition of rare earth, and the addition of the Cu content causes the corrosion resistance to be reduced.
Disclosure of Invention
The invention aims to provide a hot-dip aluminum plated steel plate with excellent heat resistance and high-temperature oxidation resistance and a production method thereof.
The specific technical scheme of the invention is as follows:
the invention provides a hot-dip coated steel plate with excellent heat resistance and high-temperature oxidation resistance, which comprises a substrate and a coating, wherein the substrate comprises the following chemical components in percentage by mass: c: less than or equal to 0.25 percent; si: less than or equal to 0.080 percent; mn is more than or equal to 0.10 percent and less than or equal to 1.20 percent; p: less than or equal to 0.020%; s: less than or equal to 0.015 percent; al: 0.020% -0.055%; n: less than or equal to 0.0050 percent; ti: less than or equal to 0.10 percent; nb: less than or equal to 0.10 percent, and the balance of Fe and inevitable impurities.
The plating layer comprises the following chemical components in percentage by mass: 3 to 5 percent of Si, 1.0 to 3.0 percent of Fe, 0.05 to 0.2 percent of La0.05 to 0.2 percent of Mg, and the balance of Al and a small amount of inevitable impurities.
The invention provides a production method of the steel plate with the excellent heat-resistant and high-temperature oxidation-resistant hot dip coating, which comprises the following steps:
1) pretreating molten iron;
2) smelting in a converter;
3) an alloy fine tuning station;
4) refining in an RH furnace;
5) continuous casting;
6) discharging a casting blank;
7) hot rolling;
8) finish rolling;
9) coiling;
10) cold rolling and cleaning;
11) continuous annealing;
12) hot dip coating aluminum silicon, and then cooling;
13) and (4) finishing and pulling and straightening.
Further, step 1) molten iron pretreatment: pre-skimming and post-skimming are required.
Step 2) converter smelting: no pig iron or slag steel is added; self-circulation steel scrap tapping is adopted, converter dephosphorization is enhanced, and slag blocking operation is enhanced; lime is added in the tapping process, and deoxidation is not carried out.
Step 3) an alloy fine-tuning station: and modifying the ladle top slag.
Step 4) RH furnace refining: RH adopts light treatment process, if oxygen is required to be blown, oxygen is blown in the early and middle stages according to temperature and oxygen level; and ensuring that the net circulation time is not less than 6min before breaking.
Step 5) continuous casting: the target temperature of the tundish is controlled to be 20-40 ℃ above the liquidus temperature.
And 6) controlling the discharging temperature of the casting blank to be 1160-1260 ℃.
Step 7) hot rolling: and (4) continuously rolling by using six frames, and carrying out high-pressure descaling at a primary inlet and a secondary outlet.
And step 8), controlling the finishing temperature to be 850-950 ℃.
Step 9), the coiling temperature is controlled to be 680-760 ℃.
And step 10), the total rolling reduction of the cold rolling is controlled to be 50-80%, and the surface roughness Ra value of the hard rolling coil is controlled to be 0.4-1.6 mu m. In order to effectively remove impurities such as rolling oil, iron powder and the like on the surface of the cold-rolled steel plate strip steel so as to enable the strip steel to enter a vertical annealing furnace from a clean surface, the cleaning specifically comprises the following steps: the degreasing solution concentration in the alkaline washing tank is as follows: 1-2% at 70-90 deg.C; the concentration of the degreasing solution in the electrolytic cleaning tank is as follows: 3-8% and the temperature is 70-90 ℃.
Step 11) continuous annealing: the atmosphere in the reducing furnace comprises the following components in percentage by volume: h2: 5 to 10 percent of N, and the balance of N2(ii) a The dew point in the furnace is controlled to be-20 to-50 ℃, and the soaking temperature is controlled to be 720 to 850 ℃.
Step (ii) of12) Hot dip aluminum silicon plating: the temperature of the plating solution is 640-720 ℃, the pot-entering temperature of the steel plate is 640-720 ℃, and the immersion plating time is 2-5 s. Cooling the aluminum-plated silicon steel plate by a fan at a cooling rate of 20-80 ℃/s. Controlling the weight of one side of the coating to be 30g/m by an air knife, a dip plating process and the like2-100g/m2。
Step 13) finishing and withdrawal and straightening: the finishing elongation is controlled to be 0.5-2.0%, and the withdrawal and straightening elongation is controlled to be 0.2-1.0%.
The cold-rolled substrate of the aluminum-coated steel sheet is mainly based on the following principle:
carbon (C): c is the most economical and effective solid solution strengthening element for improving strength, and the content of C increases, and the strength increases, but the plasticity and formability of the steel decrease. The increase of the C content in the carbon steel can prevent the growth of the alloy layer from decreasing the thickness of the alloy layer. The percentage content control range of C in the invention is that C is less than or equal to 0.25 percent.
Manganese (Mn) belongs to an alloy element capable of expanding the range of a gamma phase region, a continuous solid solution is not formed in an Fe-Mn system in a solid state, the diffusion of manganese in α iron and gamma iron is far more difficult than the diffusion of carbon, the thickness and the hardness of an alloy layer after aluminizing are reduced along with the increase of the manganese content in a steel matrix, and the percentage content of Mn in the invention is controlled to be more than or equal to 0.10% and less than or equal to 1.20%.
Silicon (Si): the silicon in the steel can block the growth of the alloy layer, the thickness of the alloy layer can be greatly reduced, the silicon content in the steel is improved, and the hardness of the alloy layer can be reduced. However, if the content of Si is too high, oxides are easily generated on the surface of the steel sheet, and the oxides of silicon affect the coating performance of the steel sheet, thereby causing poor coating defects. The percentage content control range of Si in the invention is less than or equal to 0.080%.
Phosphorus (P): phosphorus is an element effective for strengthening steel, but when the amount of phosphorus added exceeds 0.050%, the surface oxide layer (scale) formed by hot rolling is excessively peeled off, and the surface properties after plating are deteriorated. The percentage content control range of P in the invention is less than or equal to 0.020%.
Sulfur (S): s is a harmful element under normal conditions, causes hot brittleness of steel, reduces ductility and toughness of the steel, causes cracks during forging and rolling, influences the quality of a phosphating film on the surface of a cold-rolled sheet, and requires the content of S to be as low as possible, so the S percentage content of the steel grade is controlled to be below 0.015 percent.
Aluminum (Al): al is used as a main deoxidizer, and meanwhile, aluminum also has a certain effect on grain refinement. Aluminum has the disadvantage of affecting the hot workability, weldability and machinability of the steel. The percentage content of Al is controlled to be 0.020-0.055%.
Nitrogen (N): n can improve the strength, low-temperature toughness and weldability of steel and increase aging sensitivity. The invention controls the N percentage content of the steel grade below 0.0050%.
Titanium (Ti) and niobium (Nb): titanium and niobium are strong C, N compound forming elements, and the purpose of adding titanium and niobium into steel is to fix interstitial atoms C and N in the steel and purify a ferrite matrix, so that the steel grade has good deep drawing performance. Meanwhile, the niobium and the titanium can play roles in precipitation strengthening and grain refinement, and the composite addition of the niobium and the titanium is beneficial to hot galvanizing on the surface of the steel plate. Therefore, the content thereof is limited to titanium: less than or equal to 0.10 percent, niobium: less than or equal to 0.10 percent.
The alloy layer is thick and embedded on an iron substrate in a tongue shape when the dip plating solution is pure aluminum, and the plating layer is hard and brittle and can hardly be processed secondarily, by adding silicon element in the plating solution, the formation of a tongue-shaped structure can be inhibited, and the alloy layer thickness is reduced, while the thickness of a diffusion layer in an aluminum-silicon plating layer is an important factor influencing the high-temperature oxidation resistance of the aluminum-plated steel, under the same oxidation condition, the higher the silicon content is, the poorer the oxidation resistance is, because the thinner the diffusion layer of the aluminum-plated steel is, the lower the oxidation resistance is, the less silicon is contained in the plating layer, the alloy phase is mainly composed of Fe2Al5, Fe2Al5 is an orthogonal crystal structure, the C axis is completely occupied by aluminum atoms, and has about 30% of vacancies, which also indicates that η -Fe2Al5 grows in a specific direction when the plating layer contains less silicon, the alloy layer has been thickened with the increase of pores of the alloy layer, particularly the Fe2Al5 layer grows so that the number of pores formed by growth of the original growth of the pores is reduced, the small pores grow into Si-containing silicon, the Si-phase grows in a large Si-Si phase, and the Si-C-Si-phase grows to a large Si-C-Si.
The presence of iron in aluminium generally has a detrimental effect on the appearance of the aluminium-silicon coating and when the iron content is greater than 5% a matt and uneven thickness and porosity coating will result. The Fe content in the plating solution of the patent is 1.0-3.0%.
The rare earth is a surface active substance, and can reduce the surface tension of the aluminum liquid and improve the fluidity of the aluminum liquid, thereby improving the wettability of the aluminum liquid to a steel matrix and obtaining a coating with good surface quality. The rare earth content is 0.05-0.2%; the aluminum liquid is added with a trace amount of magnesium, so that the thickness of an alloy layer can be reduced, the content of Mg is 0.05-0.2 percent, and the balance is Al and a small amount of inevitable impurities.
The steel strip enters an aluminum pot after coming out of the furnace nose, the higher the temperature of the plating solution is, the stronger the atomic diffusion capacity is, and the atomic diffusion thickness is increased; the longer the immersion plating time, the greater the atomic diffusion number, the longer the diffusion distance, and the greater the plating thickness. If the temperature of the aluminum liquid is higher, the aluminum can accelerate the reaction with the iron of the substrate to form a thicker alloy layer, which causes adverse effect on the bonding force of the plating layer. If the temperature of the aluminum liquid is too low, the fluidity of the aluminum liquid is poor, and the thickness of the aluminum layer is difficult to control and is rough.
Compared with the prior art, the hot-dip aluminum-plated silicon steel plate with excellent heat resistance and high-temperature oxidation resistance is produced by controlling the substrate components, the annealing process, the plating solution components, the dip plating process and the like of the aluminum-plated silicon steel plate.
Drawings
FIG. 1 is a sectional view of an Al-Si plating layer of a hot-dip plated steel sheet having excellent heat resistance and high-temperature oxidation resistance according to the present invention;
FIG. 2 is a view showing the surface condition of the Al-Si plated layer of the hot-dip coated steel sheet having excellent heat resistance and high-temperature oxidation resistance produced according to the present invention after heating at 500 ℃.
Detailed Description
Examples 1 to 4
A hot dip coating steel plate with excellent heat resistance and high temperature oxidation resistance comprises a substrate and a coating, wherein the substrate comprises the following chemical components in percentage by mass: see table 1 below, with the balance being Fe and unavoidable impurities.
The plating layer comprises the following chemical components in percentage by mass: see table 2 below, with the balance Al and small amounts of unavoidable impurities.
Table 1 examples 1-4 substrate chemistries, wt%
| C | Si | Mn | P | S | Als | N | Nb | Ti | |
| Example 1 | 0.090 | 0.020 | 0.30 | 0.013 | 0.008 | 0.048 | 0.0034 | 0.008 | 0.008 |
| Example 2 | 0.050 | 0.015 | 0.45 | 0.007 | 0.006 | 0.040 | 0.0019 | 0.015 | 0.010 |
| Example 3 | 0.020 | 0.070 | 0.25 | 0.010 | 0.002 | 0.035 | 0.0027 | 0.040 | 0.020 |
| Example 4 | 0.015 | 0.060 | 0.10 | 0.010 | 0.003 | 0.036 | 0.0009 | 0.005 | 0.060 |
Table 2 examples 1-4 coating chemistries, wt%
| Si | Fe | La | Mg | |
| Example 1 | 4.0％ | 1.1％ | 0.15％ | 0.15％ |
| Example 2 | 3.8％ | 1.3％ | 0.05％ | 0.10％ |
| Example 3 | 3.5％ | 1.4％ | 0.15％ | 0.10％ |
| Example 4 | 3.4％ | 1.3％ | 0.10％ | 0.06％ |
The method for producing the hot-dip coated steel sheet having excellent heat resistance and high temperature oxidation resistance as described above comprises the steps of:
1) pretreating molten iron: pre-skimming and post-skimming are required.
2) Smelting in a converter: no pig iron or slag steel is added; self-circulation steel scrap tapping is adopted, converter dephosphorization is enhanced, and slag blocking operation is enhanced; lime is added in the tapping process, and deoxidation is not carried out.
3) Alloy fine adjustment station: and modifying the ladle top slag.
4) And (3) refining in an RH furnace: RH adopts light treatment process, if oxygen is required to be blown, oxygen is blown in the early and middle stages according to temperature and oxygen level; and ensuring that the net circulation time is not less than 6min before breaking.
5) Continuous casting: the target temperature of the tundish is controlled to be 20-40 ℃ above the liquidus temperature.
6) The discharging temperature of the casting blank is controlled at 1230 ℃.
7) Hot rolling: and (4) continuously rolling by using six frames, and carrying out high-pressure descaling at a primary inlet and a secondary outlet.
8) The finishing temperature control is shown in Table 3 below.
9) The coiling temperature was controlled as shown in Table 3 below.
10) And (3) cold rolling by a five-frame full six-roller cold continuous rolling mill, wherein the total cold rolling reduction rate is controlled to be 80%, and the surface roughness Ra value of a hard roll is controlled to be 0.4-1.6 mu m. In order to effectively remove impurities such as rolling oil, iron powder and the like on the surface of the cold-rolled steel plate strip steel so as to enable the strip steel to enter a vertical annealing furnace from a clean surface, the cleaning specifically comprises the following steps: the degreasing solution concentration in the alkaline washing tank is as follows: 1.4 percent and the temperature is 80 ℃; the concentration of the degreasing solution in the electrolytic cleaning tank is as follows: 5% and a temperature of 80 ℃.
11) And (3) continuous annealing: the atmosphere in the reducing furnace comprises the following components in percentage by volume: h2: 5% and the balance being N2(ii) a The dew point in the furnace is controlled at-50 ℃ and the soaking temperature is controlled as shown in the following table 3.
12) Hot dip aluminum silicon plating: the temperature of the plating solution is 700 ℃, the pot-in temperature of the steel plate is 700 ℃, and the dip plating time is 4 s. Controlling the weight of one side of the coating to be 40g/m by an air knife, a dip plating process and the like2. The aluminum-plated silicon steel plate is cooled by a fan at a cooling rate of 50 ℃/s so as to control the thickness of the alloy layer and the size of spangles on the surface. And (3) performing finishing, pulling and straightening on the aluminum-plated silicon steel plate subjected to cooling treatment under a finishing machine.
13) Finishing and straightening: the finishing elongation is controlled to be 0.5-1.2 percent, and the withdrawal and straightening elongation is controlled to be 0.2-0.8 percent.
The aluminum-plated silicon steel plate produced by the production process has excellent heat resistance and high-temperature oxidation resistance, and the surface color difference condition is that delta L is 0.44, delta b is-1.69 and delta E is 1.77 after heating and heat preservation are carried out for 24 hours at 500 ℃. The oxidation weight gain is only 0.6mg/m after heating and heat preservation for 1h at 900 DEG C2。
TABLE 3 production Process and mechanical Properties of the products
The above description is only for specific exemplary description of the present invention, and it should be noted that the specific implementation of the present invention is not limited by the above manner, and it is within the protection scope of the present invention as long as various insubstantial modifications are made by using the technical idea and technical solution of the present invention, or the technical idea and technical solution of the present invention are directly applied to other occasions without modifications.
Claims (7)
1. A method for producing a hot-dip coated steel sheet having excellent heat resistance and high-temperature oxidation resistance, comprising the steps of:
1) pretreating molten iron;
2) smelting in a converter;
3) an alloy fine tuning station;
4) refining in an RH furnace;
5) continuous casting;
6) discharging a casting blank;
7) hot rolling;
8) finish rolling;
9) coiling;
10) cold rolling and cleaning;
11) continuous annealing;
12) hot dip coating aluminum silicon, and then cooling;
13) finishing and pulling and straightening;
step 12) hot dip aluminum silicon plating: the temperature of the plating solution is 640-720 ℃, the pot-entering temperature of the steel plate is 640-720 ℃, and the immersion plating time is 2-5 s;
cooling the aluminum-plated silicon steel plate subjected to hot dip plating in the step 12) by a fan at a cooling rate of 20-80 ℃/s;
the hot-dip coated steel plate with excellent heat resistance and high-temperature oxidation resistance comprises a substrate and a coating, wherein the substrate comprises the following chemical components in percentage by mass: c: 0.020% or 0.015%; si: 0.070% or 0.060%; mn is more than or equal to 0.10 percent and less than or equal to 0.45 percent; p: less than or equal to 0.020%; s: less than or equal to 0.015 percent; al: 0.020% -0.055%; n: less than or equal to 0.0050 percent and N content of not 0; ti: less than or equal to 0.10 percent and the content of Ti is not 0; nb: not more than 0.10 percent, the Nb content is not 0, and the balance is Fe and inevitable impurities; the plating layer comprises the following chemical components in percentage by mass: 3 to 5 percent of Si, 1.1 to 3.0 percent of Fe, 0.05 to 0.2 percent of La, 0.05 to 0.2 percent of Mg, and the balance of Al and a small amount of inevitable impurities.
2. The production method according to claim 1, characterized in that step 5) continuous casting: the target temperature of the tundish is controlled to be 20-40 ℃ above the liquidus temperature, and the discharge temperature of the casting blank in the step 6) is controlled to be 1160-1260 ℃.
3. The production method according to claim 1, characterized by step 7) hot rolling: continuous rolling is carried out by six stand frames, high-pressure descaling is carried out at the primary and secondary inlets and outlets, and the finishing temperature in step 8) is controlled at 850-950 ℃.
4. The production method according to claim 1, wherein the coiling temperature in the step 9) is controlled to be 680-760 ℃.
5. The production method according to claim 1, wherein the total reduction rate of the cold rolling in the step 10) is controlled to be 50-80%, and the surface roughness Ra value of the hard rolled coil is controlled to be 0.4-1.6 μm.
6. The production method according to claim 1 or 5, wherein the cleaning of step 10) is in particular: the degreasing solution concentration in the alkaline washing tank is as follows: 1-2% at 70-90 deg.C; the concentration of the degreasing solution in the electrolytic cleaning tank is as follows: 3-8% and the temperature is 70-90 ℃.
7. The production method according to claim 1, characterized in that step 11) is a continuous annealing: the atmosphere in the reducing furnace comprises the following components in percentage by volume: h2: 5 to 10 percent of N, and the balance of N2(ii) a The dew point in the furnace is controlled to be-20 to-50 ℃, and the soaking temperature is controlled to be 720 to 850 ℃.
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| EP4092142A1 (en) * | 2019-06-03 | 2022-11-23 | ThyssenKrupp Steel Europe AG | Method for manufacturing a sheet component from a flat steel product with an anti-corrosion coating |
| CN110777319B (en) * | 2019-11-22 | 2021-12-14 | 马鞍山钢铁股份有限公司 | Plating solution for highly corrosion-resistant highly formable hot-formed steel, hot-formed steel sheet, hot-dip plating production process, hot-stamped part, and application |
| CN112877607B (en) * | 2019-11-29 | 2022-06-24 | 宝山钢铁股份有限公司 | High-strength low-alloy hot-dip aluminum alloy steel strip and manufacturing method thereof |
| CN110747400A (en) * | 2019-12-10 | 2020-02-04 | 马鞍山钢铁股份有限公司 | 275 MPa-level boron-containing high-strength and high-toughness hot-dip galvanized structural steel and production method thereof |
| CN111020296B (en) * | 2019-12-31 | 2021-05-14 | 马鞍山钢铁股份有限公司 | Ni-Al-Si alloy system coated steel plate with wide hot forming heating process window and preparation and hot stamping forming process thereof |
| CN111424212B (en) * | 2020-05-11 | 2021-11-23 | 马鞍山钢铁股份有限公司 | Aluminum-plated steel plate with tensile strength of 1800MPa, manufacturing method thereof and hot-formed part |
| CN115725906B (en) * | 2021-08-30 | 2024-02-13 | 宝山钢铁股份有限公司 | Non-magnetized annealed electromagnetic pure iron steel plate for plating zinc, aluminum and magnesium for high-voltage direct-current relay and manufacturing method thereof |
| CN114150252B (en) * | 2021-11-30 | 2023-08-29 | 马鞍山钢铁股份有限公司 | Plated hot-formed steel plate, hot-stamped part with excellent adhesive property, manufacturing method and application |
| WO2023248922A1 (en) * | 2022-06-21 | 2023-12-28 | 株式会社アイシン | Steel material processing method and electromagnetic steel sheet |
| DE102022132918A1 (en) * | 2022-12-12 | 2024-06-13 | Thyssenkrupp Steel Europe Ag | Sheet metal part with improved hardness profile |
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| CN102851629B (en) * | 2011-06-28 | 2015-09-02 | 鞍钢股份有限公司 | Aluminum-plated silicon steel plate for hot press molding and manufacturing method thereof |
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