CN113817949B - Manufacturing method of 230MPa grade high-grade computer case board - Google Patents
Manufacturing method of 230MPa grade high-grade computer case board Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 230000008569 process Effects 0.000 claims abstract description 21
- 239000011248 coating agent Substances 0.000 claims abstract description 18
- 238000000576 coating method Methods 0.000 claims abstract description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
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- 238000005096 rolling process Methods 0.000 claims description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 238000005246 galvanizing Methods 0.000 claims description 12
- 239000002253 acid Substances 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 9
- 238000010079 rubber tapping Methods 0.000 claims description 8
- 239000002893 slag Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000000137 annealing Methods 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 238000009749 continuous casting Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 238000005261 decarburization Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000005098 hot rolling Methods 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 238000006477 desulfuration reaction Methods 0.000 claims description 5
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- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 238000009628 steelmaking Methods 0.000 claims description 4
- 238000009966 trimming Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 3
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- 239000000956 alloy Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 3
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- 230000007306 turnover Effects 0.000 claims description 3
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- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
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- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
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- 241001163841 Albugo ipomoeae-panduratae Species 0.000 description 1
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- 229910000655 Killed steel Inorganic materials 0.000 description 1
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- 238000004458 analytical method Methods 0.000 description 1
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Images
Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B1/026—Rolling
-
- 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
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- 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
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- 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
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B2001/028—Slabs
-
- 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)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Coating With Molten Metal (AREA)
Abstract
The invention discloses a manufacturing method of a 230 MPa-grade high-grade computer case plate, which comprises the steps of strictly controlling the content of C and N, formulating a reasonable process, carrying out chromium-free fingerprint-resistant passivation treatment on the surface of strip steel, ensuring that a computer case has certain strength (pit resistance and drop resistance), realizing that the yield strength of a finished product is 230-270 MPa, the tensile strength is controlled at 310-360 MPa, the elongation rate reaches 35-45%, and meanwhile, the product has good corrosion resistance (the corrosion resistance area in 72 hours is less than or equal to 5%), fingerprint resistance, humidity and heat resistance, high temperature resistance, low surface resistance (the surface resistance is less than or equal to 1m omega) and good coating performance, so that the product meets the processing requirements of the computer case.
Description
Technical Field
The invention relates to the field of research and development of special steel products, in particular to a manufacturing method of a 230 MPa-grade computer case plate.
Background
With the rapid upgrade of electronic products, hot-dip galvanized fingerprint-resistant steel sheets are favored by users due to their advantages of excellent fingerprint resistance, corrosion resistance, high temperature resistance, humidity resistance, good conductivity, good coating property, and the like. The high-grade computer case is required to have certain strength and simultaneously has the requirements of pit resistance, falling resistance and dust resistance. In order to achieve the indexes, the design idea of low-carbon aluminum killed steel is adopted, and the strip steel surface treatment agent in the galvanizing procedure adopts Shanghai Paka fingerprint-resistant agent. Reasonable process control is added to meet the requirements of high-grade computer cases, the steel is a product with stamping performance and certain formability, the steel accords with the development and design concept of steel for the high-grade computer cases, the steel has high technical content, and the production difficulty is higher.
The prior literature and patent studies are as follows:
the search literature, the development of the galvanized fingerprint-resistant steel plate made of Bao steel and the application of the galvanized fingerprint-resistant steel plate in the electronic industry, writes the development process of the galvanized fingerprint-resistant steel plate made of Bao steel and the application of the galvanized fingerprint-resistant steel plate in the aspect of computer cases.
The search patent 'development and development of color plates for computer cases' mainly explains the development and development of color-coated plates, and has high production cost.
The composition and physical properties of the surface treating agent in the galvanizing procedure, the performance of the chromium-free fingerprint-resistant film and the surface quality control technology of the strip steel are explained in the retrieval literature 'development of chromium-free fingerprint-resistant galvanized steel plates for household appliances'.
Disclosure of Invention
The invention aims to provide a manufacturing method of a 230 MPa-grade high-grade computer case board, which solves the problem.
In order to solve the technical problem, the invention adopts the following technical scheme:
the invention relates to a manufacturing method of a 230 MPa-grade computer case board, which comprises the following steps:
the steel-making process comprises the following steps: KR desulfurization → converter → RH refining → slab casting;
the hot rolling process comprises the following steps: heating furnace → rough rolling high pressure water descaler → fixed width press → E1R1 rough rolling mill → E2R2 rough rolling mill → heat preservation cover → flying shear → finish rolling high pressure water descaler → F1-F7 finishing mill → encrypted laminar cooling → coiler; the heating temperature of the plate blank is 1180-1220 ℃, the finish rolling temperature is 875-905 ℃ and the coiling temperature is 665-695 ℃;
acid rolling process: acid rolling uncoiling → welding → straightening → acid washing → rinsing → drying → trimming → rolling → coiler → acid rolling reduction rate is more than or equal to 70%;
a galvanizing process: hot dip galvanizing decoiling → welding → inlet loop → cleaning → annealing furnace → zinc pot → cooling after plating → water quenching → middle loop → finishing machine → straightening machine → roller coater → drying machine → air cooling device → outlet loop → trimming → surface inspection → oil coating → sampling → coiling; outlet temperature of a galvanizing annealing/soaking section is 750-780 ℃, outlet temperature of a slow cooling section is 670-690 ℃, elongation of a temper mill is 1.0-1.20%, elongation of a tension leveler is 0.15-0.25%, and production line speed is 90-130 m/min; the roller coater adopts reverse coating, the pressure of a coating roller is more than or equal to 100kgf, and the pressure of a dipping roller is more than or equal to 150kgf.
Furthermore, in order to achieve the expected mechanical property index, the chemical components are as follows: less than or equal to 0.05 percent of C, less than or equal to 0.02 percent of Si, less than or equal to 0.3 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.015 percent of S, more than or equal to 0.020 percent of Alt, and less than or equal to 0.0050 percent of N; the balance of Fe and inevitable impurities.
Furthermore, the KR desulfurization procedure requires that the sulfur content of the molten iron fed into the converter is less than 0.005 percent, and the slag removing area of the molten iron is more than 95 percent.
Further, the control of the end point of the converter requires that the tapping temperature is more than or equal to 1660 ℃, normal turnover ladles are used for tapping, and the tapping temperature drop is required to be less than 70 ℃; adding a top slag modifier according to the oxygen content and the slag amount of the molten steel.
Further, carrying out decarburization treatment according to the in-place components and the temperature of the RH molten steel supplied by the converter; after the decarburization is finished, adding aluminum particles for deoxidation according to the oxygen determination condition, and adding alloy such as ferromanganese and the like after the deoxidation is finished to adjust the components of the molten steel to a target value;
the casting machine in the continuous casting process is controlled by adopting a constant casting speed, and the casting speed range is 1.0-1.8 m/min; the nitrogen increasing amount in the continuous casting process is required to be less than 5ppm.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the chemical components, the hot rolling process, the acid rolling process and the galvanizing process, the steel strip which has good stability of mechanical performance, good corrosion resistance, fingerprint resistance, high temperature resistance and other indexes and meets the use requirements of high-grade computer cases and large-scale servers can be manufactured.
The invention relates to the development of hot galvanizing fingerprint resistant plate, which is designed and developed from the whole flow of chemical components, smelting, hot rolling, cold rolling and hot galvanizing processes, and the development process is elaborated by the perfection of a comparison system. Not only has low production cost, but also meets the environmental protection requirements of international ROSH and Reach. The yield strength is controlled to be 230-270 MPa, the tensile strength is controlled to be 310-360 MPa, the elongation rate reaches 35% -45%, and the phenomena of cracking and the like in the process of punching the computer case due to large performance fluctuation are effectively avoided.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a structural diagram of a high-grade computer case board manufactured by the present invention;
FIG. 2 is a photograph of a 72 hour salt spray etch;
FIG. 3 shows the results of the humidity and heat resistance and high temperature test, wherein the left side is a single sheet and the right side is a laminate;
FIG. 4 shows the results of coating performance tests, in which the left side is an amino alkyd coating, the middle is an Acksol polyester powder coating, and the right side is a chromium-free colored paint;
FIG. 5 is a test picture after being pressed with a finger;
Detailed Description
A manufacturing method of a 230 MPa-grade high-grade computer case plate comprises the following steps:
smelting process
KR desulfurization process: the sulfur content of the molten iron fed into the converter is required to be less than 0.005%, and the slag-removing area of the molten iron is required to be more than 95% (the surface of the molten iron after slag removal is cleaner).
A converter smelting process: the control requirements of the converter end point are as follows: the tapping temperature is more than or equal to 1660 ℃, steel is tapped from a normal turnover ladle, and the tapping temperature drop requirement is less than 70 ℃. Adding a top slag modifier according to the oxygen content and the slag amount of the molten steel.
RH process: and performing decarburization treatment according to the in-place components and the temperature of the RH molten steel supplied by the converter. After the decarburization is finished, aluminum particles are added for deoxidation according to the oxygen determination condition, and after the deoxidation is finished, alloy such as ferromanganese is added to adjust the molten steel components to a target value.
And (3) continuous casting process: the casting machine is controlled by adopting a constant drawing speed, and the drawing speed range is 1.0-1.8 m/min; the nitrogen increasing amount in the continuous casting process is required to be less than 5ppm.
Hot rolling process
A stepping heating furnace is adopted to heat the casting blank (the heating process is shown in table 1), the rough rolling adopts a 3+3 mode, the finish rolling temperature is 875 to 905 ℃, the coiling temperature is 665 to 695 ℃, and the specific hot rolling process is shown in table 2.
TABLE 1 heating System of casting blanks
TABLE 2 Rolling Process
The control conditions of the outlet temperature of each section of the galvanizing annealing furnace are shown in Table 3, and the elongation rates of the leveler and the tension leveler are set in Table 4.
TABLE 3 annealing Process
TABLE 4 temper mill, withdrawal and straightening machine process
Examples analysis
Steelmaking compositions
According to the above steel making process requirements, the actual slab chemical composition (mass%) is shown in table 5.
Table 5 example chemical composition wt. -%)
Mechanical properties
The room-temperature tensile mechanical properties of the finished product are shown in a table 6, the yield and tensile strength of the product are stable, the user allowable range is 50MPa, the fluctuation range of the product manufactured according to the invention is less than 40MPa, the metallographic structure is ferrite and a small amount of pearlite, and the structure morphology is shown in a figure 1.
TABLE 6 tensile Properties of the finished product
Salt spray performance
The neutral salt spray corrosion test results of the product are shown in the table 7 and the figure 2, the salt spray test can meet the corrosion area less than or equal to 5 percent in 72 hours, and the requirements of users and markets are met.
TABLE 7 neutral salt spray test results
Surface resistance
In order to ensure that the electronic and electric appliance shells have good antistatic performance, manufacturers generally require that the surface resistance of fingerprint-resistant products is less than 1m omega, the result of the surface resistance of fingerprint-resistant plates is shown in table 8, and test results show that the antistatic performance and the conductive performance of each fingerprint-resistant plate can meet the requirements.
TABLE 8 surface resistance at different positions
Resistance to humidity, heat and high temperature
And (3) placing the sample plate in a constant temperature and humidity box with the temperature of 150 ℃ and the humidity of 95% in a single-piece and laminated mode, taking out and drying after 120h, observing the surface condition of the sample plate, and measuring the color difference change before and after single-piece and laminated. The results of the humidity and heat resistance and high temperature resistance tests and the appearance are shown in table 9 and fig. 2, and after the single-piece/laminated plate is subjected to humidity and heat, the plate surface color difference of the passivated plate meets the requirements and is free of white rust.
TABLE 9 Damp and Heat test
Coating performance
Cleaning a sample by using a degreasing agent at normal temperature, washing and drying the sample, and then respectively using an amino alkyd resin coating, an akkersu polyester powder coating and a chromium-free color paint to perform a coating test, wherein the binding force between the fingerprint-resistant plate and the amino alkyd resin, the akkersu polyester powder and the chromium-free color paint is good, the coating does not fall off in a Baige test, 100% of the fingerprint-resistant plate is qualified, and the test result and the appearance are shown in Table 10 and figure 4.
TABLE 10 coating Properties
Fingerprint resistance
The sample was degreased at 50 ℃ and easily immersed for 1min, then immersed for 3min in a silane bath at 40 ℃, washed and dried with water, and then pressed with a finger, with no residual finger print on the surface, as shown in table 11 and fig. 5.
TABLE 11 fingerprint resistance
Situation of use
The product manufactured according to the invention has good stamping condition after being processed by users and parts thereof.
According to the invention, through strictly controlling the contents of C and N, formulating a reasonable process and carrying out chromium-free fingerprint-resistant passivation treatment on the surface of strip steel, the computer case is ensured to have certain strength (pit resistance and drop resistance), the yield strength of the finished product is controlled to be 230-270 MPa, the tensile strength is controlled to be 310-360 MPa, the elongation rate reaches 35% -45%, and meanwhile, the computer case has good corrosion resistance (the corrosion resistance area is less than or equal to 5% in 72 hours), fingerprint resistance, humidity and heat resistance, high temperature resistance, low surface resistance (the surface resistance is less than or equal to 1m omega) and good coating performance, so that the product meets the processing requirements of the computer case.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (4)
1. A manufacturing method of a 230 MPa-grade high-grade computer case board is characterized by comprising the following steps:
the steel-making process comprises the following steps: KR desulfurization → converter → RH refining → slab casting;
the hot rolling process comprises the following steps: heating furnace → rough rolling high pressure water descaler → fixed width press → E1R1 rough rolling mill → E2R2 rough rolling mill → heat preservation cover → flying shear → finish rolling high pressure water descaler → F1-F7 finishing mill → encrypted laminar cooling → coiler; the heating temperature of the plate blank is 1180-1220 ℃, the finish rolling temperature is 875-905 ℃, and the coiling temperature is 665-695 ℃;
acid rolling process: acid rolling and uncoiling → welding → straightening → acid washing → rinsing → drying → trimming → rolling → coiling → acid rolling reduction rate is more than or equal to 70%;
a galvanizing process: hot galvanizing decoiling → welding → inlet loop → cleaning → annealing furnace → zinc pot → cooling after plating → water quenching → middle loop → finishing machine → straightening machine → roller coater → drying machine → air cooling device → outlet loop → trimming → surface inspection → oil coating → sampling → coiling; outlet temperature of a galvanizing annealing/soaking section is 750-780 ℃, outlet temperature of a slow cooling section is 670-690 ℃, elongation of a temper mill is 1.0-1.20%, elongation of a tension leveler is 0.15-0.25%, and production line speed is 90-130 m/min; the roller coater adopts reverse coating, the pressure of a coating roller is more than or equal to 100kgf, and the pressure of a dipping roller is more than or equal to 150kgf;
in order to achieve the expected mechanical property index, the chemical components are as follows: less than or equal to 0.05 percent of C, less than or equal to 0.02 percent of Si, less than or equal to 0.3 percent of Mn, less than or equal to 0.02 percent of P, less than or equal to 0.015 percent of S, more than or equal to 0.020 percent of Alt, and less than or equal to 0.0050 percent of N; the balance of Fe and inevitable impurities.
2. The method for manufacturing a 230MPa grade high-grade computer case plate according to claim 1, wherein: the KR desulfurization procedure requires that the sulfur content of the molten iron fed into the converter is less than 0.005 percent, and the slag-off area of the molten iron is more than 95 percent.
3. The method for manufacturing a 230MPa grade high-grade computer case plate according to claim 1, wherein: the tapping temperature is required to be more than or equal to 1660 ℃ in the control of the converter terminal point, normal turnover ladles are used for tapping, and the tapping temperature drop requirement is less than 70 ℃; adding a top slag modifier according to the oxygen content and the slag amount of the molten steel.
4. The manufacturing method of 230MPa grade high-grade computer case plate according to claim 1, characterized in that: carrying out decarburization treatment according to the in-place components and the temperature of RH molten steel supplied by the converter; after the decarburization is finished, adding aluminum particles for deoxidation according to the oxygen determination condition, and adding ferromanganese alloy to adjust the components of the molten steel to a target value after the deoxidation is finished;
the casting machine in the continuous casting process is controlled by adopting a constant drawing speed, and the drawing speed range is 1.0-1.8 m/min; the nitrogen increasing amount in the continuous casting process is required to be less than 5ppm.
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