CN115044912B - Manufacturing method of high-roughness high-strength stainless steel for building - Google Patents
Manufacturing method of high-roughness high-strength stainless steel for building Download PDFInfo
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- 239000010935 stainless steel Substances 0.000 title claims abstract description 28
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 32
- 239000010959 steel Substances 0.000 claims abstract description 32
- 239000002253 acid Substances 0.000 claims abstract description 19
- 238000005406 washing Methods 0.000 claims abstract description 18
- 238000000137 annealing Methods 0.000 claims abstract description 17
- 238000005554 pickling Methods 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000004140 cleaning Methods 0.000 claims abstract description 12
- 239000010960 cold rolled steel Substances 0.000 claims abstract description 6
- 238000005097 cold rolling Methods 0.000 claims abstract description 6
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 16
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 16
- 229910017604 nitric acid Inorganic materials 0.000 claims description 16
- 238000005096 rolling process Methods 0.000 claims description 10
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 8
- 238000005422 blasting Methods 0.000 claims description 8
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 8
- 235000011152 sodium sulphate Nutrition 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000001680 brushing effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 16
- 230000003746 surface roughness Effects 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 9
- 238000011033 desalting Methods 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000010410 layer Substances 0.000 description 5
- 229910000975 Carbon steel Inorganic materials 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid group Chemical group S(O)(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000002344 surface layer Substances 0.000 description 3
- 229910001208 Crucible steel Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000002161 passivation Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/24—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- 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
- C21D8/0252—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment with application of tension
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/085—Iron or steel solutions containing HNO3
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/086—Iron or steel solutions containing HF
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention provides a manufacturing method of high-roughness high-strength stainless steel for buildings, which comprises the following steps: annealing and descaling the black skin coil, and cleaning by desalted water to obtain a matte steel coil; cold rolling the matte steel coil to obtain a cold-rolled steel coil; and (3) sequentially carrying out annealing and acid washing and pure tension straightening on the cold rolled steel coil, wherein the tension of the pure tension straightening is 140-170N/mm 2. The manufacturing method of the high-roughness high-strength stainless steel for the building has the advantages of simple process flow and convenient operation, replaces the black skin coil annealed by pickling treatment in the prior art by desalting water, improves the surface roughness of the product, can improve the grain size grade of a microscopic metallographic structure by carrying out withdrawal straightening in a pure tension mode, and has wide application prospect.
Description
Technical Field
The invention belongs to the field of stainless steel processing technology, and particularly relates to a manufacturing method of high-roughness high-strength stainless steel for buildings.
Background
Along with the implementation of the national 'double carbon' policy, materials in the building decoration industry gradually change and develop towards the energy environment-friendly direction. The original large-scale production enterprises process and manufacture the factory building and are all built by taking common carbon steel materials as base materials, the outer wall and the roof tiles are all made of common carbon steel color-coated galvanized plates, the overall corrosion resistance effect is poor, the replacement period is generally 1-2 years, and the maintenance cost is high. Through technological reform and new material updating, stainless steel becomes the first choice material in the current social building industry due to its good corrosion resistance and oxidation resistance. Currently, plain carbon steel is rapidly transformed into stainless steel substrates. However, in the research and development process, the surface roughness of the stainless steel material 2B is between 0.05 mu m and 0.15 mu m, and the overall roughness is lower than that of the original plain carbon steel. In the processing process of the color-coated plate product, the uneven condition of the paint surface is caused due to poor surface adhesiveness, and the production efficiency of the product is affected.
In the conventional technical field of stainless steel production, the surface roughness is improved by rolling roughness during cold rolling, leveling roller surface roughness during leveling of finished products and adding rough grinding process procedures. However, from the viewpoint of economic cost, the above measures increase the production cost of the working procedure. Therefore, developing a method for improving the surface roughness of stainless steel products is a technical problem to be solved in the field.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for manufacturing high-roughness high-strength stainless steel for construction, which simplifies the production process, improves the production efficiency, and improves the surface roughness, the mechanical properties and the grain size grade of the stainless steel.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a manufacturing method of high-roughness high-strength stainless steel for buildings comprises the following steps:
Step S1: after annealing and descaling, the black skin coil is cleaned by desalted water to obtain a matte steel coil, and acid washing is adopted after annealing and descaling in the prior art, the method creatively uses the desalted water for cleaning, so that the damage of an acid medium to an oxide layer on the surface layer can be reduced, a passivation layer structure is not formed, and the acid consumption cost is reduced;
step S2: cold rolling the matte steel coil to obtain a cold-rolled steel coil;
Step S3: the cold-rolled steel coil is sequentially subjected to annealing and acid washing and pure tension straightening, the tension of the pure tension straightening is 140-170N/mm 2, the pure tension straightening is used for improving the flatness of the plate type, and in the implementation process, the grain size index in the microscopic metallographic structure of the stainless steel product is obviously improved, and then the unit tension is increased, and the grain size grade is higher.
Further, the step S1 of descaling comprises the treatment of a descaling machine and the treatment of a shot blasting machine, wherein the elongation of the descaling machine is 2.5% -3.5%, the working current of the shot blasting machine is 125-135A, the rotating speed is 2150rpm, and the blasting speed of the steel shot is 60-80m/S.
Further, in the annealing in the step S1, the temperature of a heating section of the annealing furnace is 1160-1180 ℃, and the temperature of the annealed matte steel coil is less than or equal to 80 ℃.
Further, the black skin coil is brushed by a brush roller before the desalted water is cleaned in the step S1.
Further, the temperature of the desalted water washing in the step S1 is 70-80 ℃.
Further, in step S1, the desalted water is cleaned and simultaneously brushed by a brushing machine.
Further, the deformation amount of the cold rolling in the step S2 is 70% -80%, and the rolling speed is less than or equal to 300mpm.
Further, the acid washing in the step S3 comprises electrolytic sodium sulfate washing, electrolytic nitric acid washing and mixed acid washing, wherein the concentration of sodium sulfate in the electrolytic sodium sulfate washing is 100-200g/L, the temperature is 70-80 ℃, the concentration of nitric acid in the electrolytic nitric acid is 125-135g/L, the mixed acid washing uses mixed acid of nitric acid and hydrofluoric acid, the concentration of nitric acid is 110-130g/L, and the concentration of hydrofluoric acid is 10-20g/L.
Further, the annealing and pickling speed in the step S3 is 100-120mpm.
Compared with the prior art, the manufacturing method of the high-roughness high-strength stainless steel for the building has the following advantages:
the manufacturing method of the high-roughness high-strength stainless steel for the building has the advantages of simple process flow and convenient operation, replaces the black skin coil annealed by pickling treatment in the prior art by desalting water, improves the surface roughness of the product, can improve the grain size grade of a microscopic metallographic structure by carrying out withdrawal straightening in a pure tension mode, and has wide application prospect.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention pertains. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to examples.
Taking a hot-rolled black steel coil with the thickness of 2.5-6.0 as a raw material, and annealing at the speed of TV90-105 in a hot wire unit; the heating section is set according to the furnace temperature of 1160-1180 ℃, and then the temperature of the strip steel passing through the cooling section is reduced to below 80 ℃. Then extruding and descaling according to the elongation of 2.5-3.5% by a descaling machine to enable the iron scales on the surface layer of the strip steel to crack and loosen, then striking the cast steel shot on the surface of the strip steel at the speed of 2150pm by a shot blasting machine under the current of 125-135A, removing the iron scales on the surface of the strip steel by a larger impact force, rolling, loosening and polishing the oxidized layer of the hot rolled coil and the secondary compact oxidized layer formed during annealing, and mixing the cast steel shot with the model S110 (the steel shot diameter is mainly 0.3 mm) and the model S170 (the steel shot diameter is mainly 0.425 mm) according to the proportion of 1:1, so as to obtain a finer and more uniform surface, and peeling the iron scales on the surface layer of the strip steel and obtaining a fine surface. At this time, the stainless steel surface state is a matte state and has a dark color, but the surface scale oxide is completely peeled off from the substrate.
Cleaning example 1
And (3) running the shot-blasted steel coil at the speed of TV100, sequentially passing through three pickling tanks, wherein electrolyte in the three pickling tanks is desalted water, the water temperature is 70-80 ℃, and the steel coil with the specification of 2.5 x 124mm is obtained, and the steel coil has the surface roughness of 4.52 mu m and the oxide residue grade of 5.
Cleaning example 2
The difference from the cleaning example 1 is that an AB brush machine is arranged between the first pickling tank and the second pickling tank, a BU brush machine is arranged behind the third pickling tank, the current of the AB brush machine is set to 125-128A, the current of the BU brush machine is set to 25-28A, the current of the BU brush machine is used for removing residual attached oxides, and the surface roughness of the steel coil is 4.48 mu m and the oxide residual grade is 3 through detection.
Cleaning example 3
The difference from the cleaning example 2 is that two groups of brush rolls are arranged in front of the first pickling tank, steel coils after shot blasting are brushed between the steel coils entering the pickling tank, brush sleeves are made of SiC silicon carbide materials, 10 brush sleeves are used for each brush roll, the outer diameter size of each brush sleeve is phi 400mm, and the steel coils are detected to have the surface roughness of 4.45 mu m and the oxide residue grade of 1.
Cleaning comparative example
The difference from the cleaning example 2 is that the electrolyte in the first pickling tank is sulfuric acid, the concentration of sulfuric acid is 220-280g/L, the electrolyte in the second pickling tank and the third pickling tank is mixed acid, the mixed acid is composed of nitric acid and hydrofluoric acid, the concentration of hydrofluoric acid is 25-35g/L, the concentration of nitric acid is 130-170g/L, and the surface roughness of the steel coil is 2.35 mu m and the oxide residue grade is 1.
Example 1
The steel coil obtained in the cleaning example 3 is sent into a rolling unit for rolling, the total deformation is controlled to be 70% -80%, and in the rolling process, the middle and rear supports are used for adjusting all the applied plate types automatically. In the process, manual fine adjustment can be performed according to the fit degree of the plate-type target curve. The rolling speed of the finished product is less than or equal to 300mpm. Quality control point, plate shape are smooth, and the surface strictly controls the defects of rolling mill roll marks, vibration marks, spiral lines and oil spots and oil marks. And after finishing finish rolling, flowing to a finished product annealing and pickling unit.
When the finished product is annealed and pickled, the process speed is 100-120 mpm. When the furnace area is produced, ceramic rollers are used for all the rollers in the furnace, so that the surface is free from quality defects such as bulges, water ripple marks and the like. Then the mixture enters an acid washing unit, and passes through an electrolytic sodium sulfate section, an electrolytic nitric acid section and an acid mixing section in sequence, wherein the concentration of the electrolytic sodium sulfate is controlled to be 100-200g/L, and the temperature is 75+/-5 ℃; the concentration of the electrolytic nitric acid is controlled to be 130+/-5 g/L; the mixed acid section adopts nitric acid and hydrofluoric acid mixed solution, the concentration of nitric acid is 120+/-10 g/L, and the concentration of hydrofluoric acid is 15+/-5 g/L. And (3) removing oxide scales on the surface of the stainless steel and forming a passivation layer.
And after annealing and pickling, the finished product is subjected to leveling production without a leveling machine and directly flows to a leveling machine set for operation. The drawing and leveling machine set in the embodiment does not use a drawing and leveling roller for operation, uses 10 tension roller devices, forms pure tension mode drawing and leveling according to 4 inlet and 6 outlet combinations, sets the technological parameters of 170N/mm 2 of unit tension, and further ensures the flatness of the plate shape to be 1mm/2m by using the principle that the finished strip steel is repeatedly bent on the surface of the tension roller in the tension mode, wherein the surface roughness of the stainless steel obtained through detection is 0.17 mu m, the tensile strength is 730Mpa, the yield strength is 310Mpa, and the grain size grade is 8.5.
Example 2
The difference from example 1 is that the unit tension of the drawing and leveling machine set is 130N/mm 2, the flatness of the plate type is 2mm/2m, the tensile strength of the detected stainless steel is 710Mpa, the yield strength is 295Mpa, and the grain size grade is 8.
Example 3
The difference from example 1 is that the unit tension of the drawing and leveling machine set is 90N/mm 2, the flatness of the plate type is 3mm/2m, the tensile strength of the stainless steel obtained by detection is 695Mpa, the yield strength is 285Mpa, and the grain size grade is 7.5.
Comparative example 1
The difference with example 1 is that the drawing and leveling machine set in comparative example 1 is composed of upper three lower two drawing and leveling rollers, the pressing amount of the drawing and leveling rollers is 15/12/5%, the control range of the elongation is 0.3% -0.55%, the flatness of the plate shape is 1mm/2mm, the surface roughness of the detected stainless steel is 0.15 mu m, the tensile strength is 700Mpa, the yield strength is 290Mpa, and the grain size grade is 7.
Comparative example 2
The difference from example 1 is that the steel coil used in comparative example 2 was a steel coil obtained by cleaning the comparative example, and the stainless steel obtained by detection had a surface roughness of 0.06 μm, a tensile strength of 710Mpa, a yield strength of 310Mpa and a grain size grade of 8.5.
Comparative example 3
The difference with comparative example 2 is that the system ratio of the pull leveler set in comparative example 3 is composed of upper three pull leveler rolls and lower two pull leveler rolls, the pull leveler roll pressing amount is 15/12/5%, the elongation control range is 0.3% -0.55%, the surface roughness of the detected stainless steel is 0.05 μm, the tensile strength is 700Mpa, the yield strength is 290Mpa, and the grain size grade is 7.5.
The stainless steel product produced by the manufacturing method is applied to the color-coated plate industry for buildings, the roughness and strength index are obviously improved, and the quality requirements of terminal clients can be met. Other parameter indexes are successfully applied to the market through related technical requirements.
In 2021, 4300 tons of color-coated plate stainless steel products for buildings are produced by adopting the method, the overflow price of ton steel is 200 yuan/ton, the economic additional value is 86 ten thousand yuan, business income is realized, and the method has good economic value and wide popularization in industry.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (1)
1. The manufacturing method of the high-roughness high-strength stainless steel for the building is characterized by comprising the following steps of:
Step S1: annealing and descaling the black skin coil, and cleaning by desalted water to obtain a matte steel coil;
step S2: cold rolling the matte steel coil to obtain a cold-rolled steel coil;
Step S3: sequentially carrying out annealing and acid washing and pure tension straightening on the cold rolled steel coil, wherein the tension of the pure tension straightening is 170N/mm 2;
The step S1 of descaling comprises the treatment of a descaling machine and the treatment of a shot blasting machine, wherein the elongation of the descaling machine is 2.5% -3.5%, the working current of the shot blasting machine is 125-135A, the rotating speed is 2150rpm, and the blasting speed of the steel shot is 60-80m/S;
In the step S1, the temperature of a heating section of the annealing furnace is 1160-1180 ℃, and the temperature of the annealed matte steel coil is less than or equal to 80 ℃;
In the step S1, the black skin coil is brushed by a brush roller before the desalted water is cleaned;
The temperature of the desalted water in the step S1 is 70-80 ℃;
In the step S1, the desalted water is cleaned and simultaneously brushed by a brushing machine;
the deformation of the cold rolling in the step S2 is 70% -80%, and the rolling speed is less than or equal to 300mpm;
The step S3 of acid washing comprises electrolytic sodium sulfate washing, electrolytic nitric acid washing and mixed acid washing, wherein the concentration of sodium sulfate in the electrolytic sodium sulfate washing is 100-200g/L, the temperature is 70-80 ℃, the concentration of nitric acid in the electrolytic nitric acid is 125-135g/L, the mixed acid washing uses mixed acid of nitric acid and hydrofluoric acid, the concentration of nitric acid is 110-130g/L, and the concentration of hydrofluoric acid is 10-20g/L;
the annealing and pickling speed in the step S3 is 100-120mpm; and after annealing and pickling, the steel is subjected to leveling production without a leveling machine, and directly flows to a leveling machine set for operation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210536235.7A CN115044912B (en) | 2022-05-17 | 2022-05-17 | Manufacturing method of high-roughness high-strength stainless steel for building |
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| CN202210536235.7A CN115044912B (en) | 2022-05-17 | 2022-05-17 | Manufacturing method of high-roughness high-strength stainless steel for building |
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| CN115044912A CN115044912A (en) | 2022-09-13 |
| CN115044912B true CN115044912B (en) | 2024-07-05 |
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| CN1122264A (en) * | 1994-07-07 | 1996-05-15 | 矿山机械和轧钢机械制造有限公司 | A process for the preparation of cold rolled stain less steel strips and metal strips, more particularly of titanium alloys |
| CN1291922A (en) * | 1998-02-25 | 2001-04-18 | 尤吉纳股份有限公司 | Installation for making cold-rolled stainless steel bands |
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| FR2740061B1 (en) * | 1995-10-19 | 1997-11-28 | Ugine Sa | PROCESS FOR THE CONTINUOUS DEVELOPMENT OF A STRIP OF LAMINATED SHEET OF STAINLESS STEEL HAVING AN IMPROVED SURFACE CONDITION |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1122264A (en) * | 1994-07-07 | 1996-05-15 | 矿山机械和轧钢机械制造有限公司 | A process for the preparation of cold rolled stain less steel strips and metal strips, more particularly of titanium alloys |
| CN1291922A (en) * | 1998-02-25 | 2001-04-18 | 尤吉纳股份有限公司 | Installation for making cold-rolled stainless steel bands |
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