CN111906142B - Process for controlling mechanical property of cold-rolled stainless steel strip - Google Patents
Process for controlling mechanical property of cold-rolled stainless steel strip Download PDFInfo
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- CN111906142B CN111906142B CN202010587790.3A CN202010587790A CN111906142B CN 111906142 B CN111906142 B CN 111906142B CN 202010587790 A CN202010587790 A CN 202010587790A CN 111906142 B CN111906142 B CN 111906142B
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 131
- 239000010935 stainless steel Substances 0.000 title claims abstract description 131
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000000137 annealing Methods 0.000 claims abstract description 53
- 238000005096 rolling process Methods 0.000 claims abstract description 51
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 238000005098 hot rolling Methods 0.000 claims abstract description 6
- 238000009966 trimming Methods 0.000 claims abstract description 6
- 230000001681 protective effect Effects 0.000 claims description 42
- 238000010041 electrostatic spinning Methods 0.000 claims description 34
- 238000003756 stirring Methods 0.000 claims description 28
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 24
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 24
- 239000007789 gas Substances 0.000 claims description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 230000005672 electromagnetic field Effects 0.000 claims description 18
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 15
- 238000009987 spinning Methods 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 14
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 11
- 239000004917 carbon fiber Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000001354 calcination Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 230000006698 induction Effects 0.000 claims description 10
- 239000012528 membrane Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 8
- 229910021529 ammonia Inorganic materials 0.000 claims description 8
- 238000000354 decomposition reaction Methods 0.000 claims description 8
- 239000001257 hydrogen Substances 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 8
- 238000001179 sorption measurement Methods 0.000 claims description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 238000005097 cold rolling Methods 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- 230000005686 electrostatic field Effects 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 230000008961 swelling Effects 0.000 claims description 5
- 239000002994 raw material Substances 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims description 2
- 238000001291 vacuum drying Methods 0.000 claims 1
- 238000001816 cooling Methods 0.000 description 9
- 239000003921 oil Substances 0.000 description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000002253 acid Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002121 nanofiber Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- GJPVPJBNBCITNZ-UHFFFAOYSA-N [N].[Mn].[Cr] Chemical compound [N].[Mn].[Cr] GJPVPJBNBCITNZ-UHFFFAOYSA-N 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Classifications
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- 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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/02—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material
-
- 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
- C21D1/04—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering with simultaneous application of supersonic waves, magnetic or electric fields
-
- 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
- C21D11/00—Process control or regulation for heat treatments
-
- 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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/40—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
- D04H1/42—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
- D04H1/4382—Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
- D04H1/00—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
- D04H1/70—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres
- D04H1/72—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged
- D04H1/728—Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres characterised by the method of forming fleeces or layers, e.g. reorientation of fibres the fibres being randomly arranged by electro-spinning
-
- 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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B2001/221—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 plates, strips, bands or sheets of indefinite length by cold-rolling
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- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Textile Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses a process for controlling mechanical properties of a cold-rolled stainless steel strip, and relates to the technical field of stainless steel strip processing. The invention relates to a process for controlling the mechanical property of a cold-rolled stainless steel strip, which comprises the following steps: carrying out initial rolling on the stainless steel blank subjected to hot rolling to obtain an initial rolled stainless steel band; annealing the primary rolled stainless steel band for the first time; placing the bloomed stainless steel strip processed in the step S2 on a first finishing mill, and performing primary finishing rolling; placing the bloomed stainless steel strip processed in the step S3 on a second finishing mill, and performing secondary finish rolling to obtain a finish-rolled stainless steel strip; and (4) after secondary annealing is carried out on the finish-rolled stainless steel band, cleaning, trimming and leveling to obtain a stainless steel band product. The invention discloses a process for controlling the mechanical property of a cold-rolled stainless steel strip, which can effectively eliminate the stress in the primary-rolled stainless steel strip and ensure the mechanical property of the cold-rolled stainless steel strip by carrying out primary annealing, primary finish rolling and secondary finish rolling treatment on the primary-rolled stainless steel strip.
Description
Technical Field
The invention relates to the technical field of stainless steel strip processing, in particular to a process for controlling the mechanical property of a cold-rolled stainless steel strip.
Background
Stainless Steel (Stainless Steel) is short for Stainless acid-resistant Steel, and Steel which is resistant to weak corrosive media such as air, steam and water or has Stainless property is called Stainless Steel; steel grades that are resistant to corrosion by chemical agents (chemical attacks such as acids, bases, salts, etc.) are referred to as acid-resistant steels. Because the corrosion resistance of the stainless steel is different due to the difference of the chemical components of the stainless steel and the stainless steel, the common stainless steel is generally not resistant to the corrosion of chemical media, the acid-resistant steel is generally stainless, and the stainless steel is generally divided into the following parts according to the structure states: martensitic steel, ferritic steel, austenitic-ferritic (duplex) stainless steel, precipitation hardening stainless steel, and the like, and further, can be divided into: chromium stainless steel, chromium nickel stainless steel, chromium manganese nitrogen stainless steel and the like.
The stainless steel band is an extension of the ultrathin stainless steel plate, is a narrow and long steel plate produced by meeting the requirements of different industrial departments for industrially producing various types of metal or mechanical products, is widely applied to high-technology industry, IT industry and aviation and aerospace industry, and has high added value. In the prior art, stainless steel strips are directly subjected to finish rolling after primary rolling during processing, but internal stress can be generated inside the stainless steel strips after primary rolling, so that the effect of finish rolling is influenced, the forming of finished products is greatly influenced, and the stainless steel strips are easy to deform during deep processing such as stamping, cold bending and the like, so that the yield is low, and the production efficiency is greatly influenced.
Disclosure of Invention
In view of the above problems, the present invention aims to disclose a process for controlling the mechanical properties of a cold-rolled stainless steel strip, which can effectively eliminate the stress in the primary-rolled stainless steel strip and ensure the mechanical properties of the cold-rolled stainless steel strip by performing primary annealing, primary finish rolling and secondary finish rolling on the primary-rolled stainless steel strip.
Specifically, the process for controlling the mechanical property of the cold-rolled stainless steel strip specifically comprises the following steps:
s1: performing primary rolling on the stainless steel blank subjected to hot rolling, and rolling by using a cold rolling mill to obtain a primary rolled stainless steel band;
s2: removing oil stains on the surface of the primary rolled stainless steel strip, drying the primary rolled stainless steel strip, placing the primary rolled stainless steel strip in an annealing furnace, and carrying out primary annealing under the condition of applying a first pulse electromagnetic field;
s3: placing the bloomed stainless steel strip processed in the step S2 on a first finishing mill, and performing primary finish rolling by a first finishing roller;
s4: placing the bloomed stainless steel strip processed in the step S3 on a second finishing mill, and performing secondary finish rolling by a second finishing roll to obtain a finish-rolled stainless steel strip;
s5: removing oil stains on the surface of the finish-rolled stainless steel band, drying, covering with a protective film, placing in an annealing furnace under the condition of applying a second pulse electromagnetic field, carrying out secondary annealing, removing the protective film by utilizing electrostatic adsorption, cleaning, trimming and flattening to obtain a stainless steel band product, wherein the protective film is prepared by taking polyvinyl alcohol, short carbon fiber and tetraethoxysilane as raw materials, forming a film by electrostatic spinning, and then firing at a high temperature.
Further, the preparation method of the protective film comprises the following steps:
a1: weighing polyvinyl alcohol powder, adding the polyvinyl alcohol powder into deionized water, standing for full swelling, magnetically stirring, heating to 70 ℃, preserving heat and stirring for 12 hours to prepare a polyvinyl alcohol solution with the mass fraction of 5-7%;
a2: respectively weighing ethyl orthosilicate, ethanol, water and anhydrous acetic acid according to the mass ratio of 10:7:0.6:0.06, stirring and mixing uniformly at the speed of 800-;
a3: mixing a polyvinyl alcohol solution and tetraethoxysilane according to a mass ratio of 1:1, continuously stirring for 5-10 hours at normal temperature, adding short carbon fibers, and continuously stirring and dispersing for 5-8 hours to obtain an electrostatic spinning solution;
a4: adding the electrostatic spinning solution into an electrostatic spinning machine, and carrying out electrostatic spinning under the conditions of spinning speed of 1ml/h, receiving distance of 20cm, spinning voltage of 25kV and spinning temperature of 25 ℃ to obtain an electrostatic spinning film;
a5: and (3) drying the prepared electrostatic spinning membrane in vacuum, heating to 800 ℃ at the speed of 5 ℃/min, calcining for 2 hours, and taking out along with the furnace after calcining to obtain the protective membrane.
Furthermore, the electrostatic field of the electrostatic adsorption is 15-25kV, and the vertical distance between the electrostatic generator and the protective film is 5-8 cm.
Further, the thickness of the stainless steel blank is 2-2.5mm, and the thickness of the stainless steel band is 0.4-0.6 mm.
Further, the annealing temperature of the primary annealing is 1050-.
Further, the protective gas is decomposition gas of ammonia, wherein the volume ratio of hydrogen to nitrogen is 3: 1.
Further, the magnetic induction intensity of the first pulse electromagnetic field is 0.2-0.23T, the pulse frequency is 20Hz, the unidirectional pulse duty ratio is 20%, the magnetic induction intensity of the second pulse electromagnetic field is 0.25-0.28T, the pulse frequency is 40Hz, and the unidirectional pulse duty ratio is 20%.
Further, the leveling step is carried out by adopting a withdrawal and straightening machine, the withdrawal and straightening speed is 40-60m/s, and the elongation of the steel strip is less than or equal to 1.5%.
The invention has the beneficial effects that:
1. the invention discloses a process for controlling the mechanical property of a cold-rolled stainless steel strip, which can effectively eliminate the stress in the rough-rolled stainless steel strip by carrying out primary annealing, primary finish rolling and secondary finish rolling on the rough-rolled stainless steel strip, ensure the mechanical property of the cold-rolled stainless steel strip, and simultaneously apply a pulse electromagnetic field in the processes of primary annealing and secondary annealing, induce the grain refinement of the stainless steel strip under the action of the pulse electromagnetic field, and form a gradient nanostructure on the surface of the stainless steel strip by parameter design of a first pulse electromagnetic field and a second pulse electromagnetic field, thereby further ensuring the mechanical property of the cold-rolled stainless steel strip.
2. According to the process for controlling the mechanical property of the cold-rolled stainless steel strip, the protective film is coated before secondary annealing, so that the stainless steel strip can be protected, the stainless steel strip can be prevented from being oxidized in the annealing process, impurities in an annealing furnace can be prevented from falling on the surface of the stainless steel strip in the annealing process to influence subsequent treatment, and the final quality of the stainless steel strip is ensured.
3. According to the protective film, after the nanofiber film is formed through electrostatic spinning, the nanofiber film is fired at high temperature and polyvinyl alcohol is decomposed to obtain the protective film made of the silicon dioxide/carbon fiber composite material, wherein the carbon fiber has good heat conducting performance, the surface of the stainless steel band can be uniformly heated in the secondary annealing process, and heat can be dissipated as soon as possible after the secondary annealing is completed; in addition, the silicon dioxide can also play a role of a soft template, can guide the grain shape and the grain size of the stainless steel band grains, and further ensures the quality of the stainless steel band.
4. According to the protective film disclosed by the invention, the carbon fiber and the silicon dioxide are used as main bodies and interact with each other, so that the protective film has light weight and good flexibility and can be repeatedly used.
Detailed Description
The present invention will be described in detail with reference to specific examples below:
according to the process for controlling the mechanical property of the cold-rolled stainless steel strip, the protective film is coated before secondary annealing, so that the stainless steel strip can be protected, wherein the protective film is formed by taking polyvinyl alcohol, short carbon fiber and tetraethoxysilane as raw materials through electrostatic spinning and then sintering at high temperature, and the process comprises the following specific steps:
example one
Preparation of protective film
A1: weighing polyvinyl alcohol powder, adding the polyvinyl alcohol powder into deionized water, standing for 5 hours for full swelling, magnetically stirring, heating to 70 ℃, preserving heat and stirring for 12 hours to prepare a polyvinyl alcohol solution with the mass fraction of 5%.
A2: respectively weighing ethyl orthosilicate, ethanol, water and anhydrous acetic acid according to the mass ratio of 10:7:0.6:0.06, stirring and mixing uniformly at the speed of 900r/min, and continuously stirring for 10 hours at normal temperature to obtain an ethyl orthosilicate solution.
A3: mixing a polyvinyl alcohol solution and tetraethoxysilane according to a mass ratio of 1:1, continuously stirring for 8 hours at normal temperature, adding short carbon fibers with the mass of 0.1 time of tetraethoxysilane, and continuously stirring and dispersing for 5 hours to obtain an electrostatic spinning solution.
A4: and adding the electrostatic spinning solution into an electrostatic spinning machine, and carrying out electrostatic spinning under the conditions of spinning speed of 1ml/h, receiving distance of 20cm, spinning voltage of 25kV and spinning temperature of 25 ℃ to obtain the electrostatic spinning film.
A5: and (3) drying the prepared electrostatic spinning membrane at 80 ℃ in vacuum, heating to 800 ℃ at the speed of 5 ℃/min, calcining for 2h, and taking out along with the furnace after calcining to obtain the protective membrane with the thickness of 80 mu m.
The production of the cold-rolled stainless steel strip by using the prepared protective film comprises the following specific operations:
s1: carrying out initial rolling on a stainless steel blank which is subjected to hot rolling and has the thickness of 2mm, rolling by a cold rolling mill at the rolling speed of 130m/min under the rolling force of 530t and the tension of 2.5t, and rolling by a roller with the roller convexity of 0.45mm in the front 1-2 passes; rolling the middle part for 2-4 times by using a roller with the roller convexity of 0.50 mm; rolling the rear part for 2-3 times by using a roller with the roller convexity of 0.35 to obtain a primary rolling stainless steel band;
s2: removing oil stains on the surface of a primary rolled stainless steel strip, drying the primary rolled stainless steel strip, placing the primary rolled stainless steel strip in an annealing furnace, carrying out primary annealing under the condition of applying a first pulse electromagnetic field with the magnetic induction intensity of 0.2T, the pulse frequency of 20Hz and the unidirectional pulse duty ratio of 20%, wherein the annealing temperature of the primary annealing is 1080 ℃, the speed of the steel strip is 15m/min, air cooling is adopted, the cooling speed is 26 ℃/min, and the protective gas is decomposition gas of ammonia, specifically mixed gas with the volume ratio of 3:1 of hydrogen and nitrogen;
s3: placing the bloomed stainless steel strip processed in the step S2 on a first finishing mill, and performing primary finish rolling by a first finishing roller;
s4: placing the bloomed stainless steel strip processed in the step S3 on a second finishing mill, and performing secondary finish rolling by a second finishing roll to obtain a finish-rolled stainless steel strip;
s5: removing oil stains on the surface of a finish-rolled stainless steel strip, drying the finish-rolled stainless steel strip, placing the finish-rolled stainless steel strip in an annealing furnace, carrying out secondary annealing under the conditions of applying a second pulse electromagnetic field with the magnetic induction intensity of 0.28T, the pulse frequency of 40Hz and the one-way pulse duty ratio of 20%, wherein the annealing temperature of the secondary annealing is 520 ℃, the steel strip speed is 18m/min, the cooling air speed is 700r/min, the protective gas is a decomposition gas of ammonia, specifically a mixed gas with the volume ratio of hydrogen to nitrogen being 3:1, after the annealing is finished, carrying out electrostatic adsorption and uncovering on the protective film under the conditions that the electrostatic field is 25kV and the vertical distance between an electrostatic generator and the protective film is 6cm, then cleaning and trimming, and carrying out leveling by adopting a tension leveler under the conditions that the tension leveling speed is 40m/s and the elongation of the steel strip is less than or equal to 1.5%, thus obtaining a stainless steel strip product with the thickness of 0.4 mm.
And (3) detecting the mechanical property of the prepared product, wherein the yield strength is 421Mpa, the tensile strength is 825Mpa, and the elongation after fracture is 62%.
Example two
Preparation of protective film
A1: weighing polyvinyl alcohol powder, adding the polyvinyl alcohol powder into deionized water, standing for 5 hours for full swelling, magnetically stirring, heating to 70 ℃, preserving heat and stirring for 12 hours to prepare a polyvinyl alcohol solution with the mass fraction of 6%.
A2: respectively weighing ethyl orthosilicate, ethanol, water and anhydrous acetic acid according to the mass ratio of 10:7:0.6:0.06, stirring and mixing uniformly at the speed of 1000r/min, and continuously stirring for 8 hours at normal temperature to obtain an ethyl orthosilicate solution.
A3: mixing a polyvinyl alcohol solution and tetraethoxysilane according to a mass ratio of 1:1, continuously stirring for 5 hours at normal temperature, adding short carbon fibers with the mass of 0.1 time of tetraethoxysilane, and continuously stirring and dispersing for 8 hours to obtain an electrostatic spinning solution.
A4: and adding the electrostatic spinning solution into an electrostatic spinning machine, and carrying out electrostatic spinning under the conditions of spinning speed of 1ml/h, receiving distance of 15cm, spinning voltage of 15kV and spinning temperature of 25 ℃ to obtain the electrostatic spinning film.
A5: and (3) drying the prepared electrostatic spinning membrane at 80 ℃ in vacuum, heating to 800 ℃ at the speed of 5 ℃/min, calcining for 2h, and taking out along with the furnace after calcining to obtain the protective membrane with the thickness of 100 mu m.
The production of the cold-rolled stainless steel strip by using the prepared protective film comprises the following specific operations:
s1: carrying out initial rolling on a stainless steel blank which is subjected to hot rolling and has the thickness of 2.5mm, rolling by a cold rolling mill at the rolling speed of 200m/min under the rolling force of 730t and the tension of 11t, and rolling by a roller with the roller convexity of 0.40mm in the front 1-2 passes; rolling the middle part for 2-4 times by using a roller with the roller convexity of 0.40 mm; rolling the rear part of the stainless steel strip by adopting a roller with the roller convexity of 0.35 for 2-3 times to obtain a primary rolling stainless steel strip;
s2: removing oil stains on the surface of a primary rolled stainless steel strip, drying the primary rolled stainless steel strip, placing the primary rolled stainless steel strip in an annealing furnace, carrying out primary annealing under the condition of applying a first pulse electromagnetic field with the magnetic induction intensity of 0.23T, the pulse frequency of 20Hz and the unidirectional pulse duty ratio of 20%, wherein the annealing temperature of the primary annealing is 1050 ℃, the speed of the steel strip is 12m/min, air cooling is adopted, the cooling speed is 25 ℃/min, and the protective gas is decomposition gas of ammonia, specifically mixed gas with the volume ratio of 3:1 of hydrogen and nitrogen;
s3: placing the bloomed stainless steel strip processed in the step S2 on a first finishing mill, and performing primary finish rolling by a first finishing roller;
s4: placing the bloomed stainless steel strip processed in the step S3 on a second finishing mill, and performing secondary finish rolling by a second finishing roll to obtain a finish-rolled stainless steel strip;
s5: removing oil stains on the surface of a finish-rolled stainless steel strip, drying the finish-rolled stainless steel strip, placing the finish-rolled stainless steel strip in an annealing furnace, carrying out secondary annealing under the conditions of applying a second pulse electromagnetic field with the magnetic induction intensity of 0.25T, the pulse frequency of 40Hz and the one-way pulse duty ratio of 20%, wherein the annealing temperature of the secondary annealing is 500 ℃, the steel strip speed is 3m/min, the cooling air speed is 900r/min, the protective gas is decomposition gas of ammonia, specifically mixed gas with the volume ratio of hydrogen to nitrogen being 3:1, after the annealing is finished, the protective film is removed by electrostatic adsorption under the conditions that the electrostatic field is 20kV and the vertical distance between an electrostatic generator and the protective film is 8cm, cleaning and trimming the finished stainless steel strip, and carrying out leveling by adopting a tension leveler under the conditions that the tension speed is 60m/s and the elongation of the steel strip is less than or equal to 1.5%, thus obtaining a stainless steel strip product with the thickness of 0.6 mm.
The mechanical property of the prepared product is detected, the yield strength is 445Mpa, the tensile strength is 831Mpa, and the elongation after fracture is 65%.
EXAMPLE III
Preparation of protective film
A1: weighing polyvinyl alcohol powder, adding the polyvinyl alcohol powder into deionized water, standing for 5 hours for full swelling, magnetically stirring, heating to 70 ℃, preserving heat and stirring for 12 hours to prepare a polyvinyl alcohol solution with the mass fraction of 7%;
a2: respectively weighing ethyl orthosilicate, ethanol, water and anhydrous acetic acid according to the mass ratio of 10:7:0.6:0.06, stirring and mixing uniformly at the speed of 800r/min, and continuously stirring for 9 hours at normal temperature to obtain an ethyl orthosilicate solution;
a3: mixing a polyvinyl alcohol solution and tetraethoxysilane according to a mass ratio of 1:1, continuously stirring for 10 hours at normal temperature, adding short carbon fibers with the mass being 0.1 time that of tetraethoxysilane, and continuously stirring and dispersing for 5 hours to obtain an electrostatic spinning solution;
a4: adding the electrostatic spinning solution into an electrostatic spinning machine, and carrying out electrostatic spinning under the conditions of spinning speed of 1ml/h, receiving distance of 15cm, spinning voltage of 15kV and spinning temperature of 25 ℃ to obtain an electrostatic spinning film;
a5: and (3) drying the prepared electrostatic spinning membrane at 80 ℃ in vacuum, heating to 800 ℃ at the speed of 5 ℃/min, calcining for 2h, and taking out along with the furnace after calcining is finished to obtain the protective membrane.
The production of the cold-rolled stainless steel strip by using the prepared protective film comprises the following specific operations:
s1: carrying out initial rolling on a stainless steel blank which is subjected to hot rolling and has the thickness of 2.3mm, rolling by a cold rolling mill at the rolling speed of 300m/min under the rolling force of 600t and the tension of 8t, and rolling by a roller with the roller convexity of 0.40mm in the front 1-2 passes; rolling the middle part for 2-4 times by using a roller with the roller convexity of 0.50 mm; rolling the rear part for 2-3 times by using a roller with the roller convexity of 0.35mm to obtain a primary rolling stainless steel band;
s2: removing oil stains on the surface of a primary rolled stainless steel strip, drying the primary rolled stainless steel strip, placing the primary rolled stainless steel strip in an annealing furnace, carrying out primary annealing under the condition of applying a first pulse electromagnetic field with the magnetic induction intensity of 0.22T, the pulse frequency of 20Hz and the unidirectional pulse duty ratio of 20%, wherein the annealing temperature of the primary annealing is 1100 ℃, the speed of the steel strip is 14m/min, air cooling is adopted, the cooling speed is 28 ℃/min, and the protective gas is decomposition gas of ammonia, specifically mixed gas with the volume ratio of 3:1 of hydrogen and nitrogen;
s3: placing the bloomed stainless steel strip processed in the step S2 on a first finishing mill, and performing primary finish rolling by a first finishing roller;
s4: placing the bloomed stainless steel strip processed in the step S3 on a second finishing mill, and performing secondary finish rolling by a second finishing roll to obtain a finish-rolled stainless steel strip;
s5: removing oil stains on the surface of a finish-rolled stainless steel strip, drying the finish-rolled stainless steel strip, placing the finish-rolled stainless steel strip in an annealing furnace, carrying out secondary annealing under the conditions of applying a second pulse electromagnetic field with the magnetic induction intensity of 0.26T, the pulse frequency of 40Hz and the one-way pulse duty ratio of 20%, wherein the annealing temperature of the secondary annealing is 530 ℃, the steel strip speed is 15m/min, the cooling air speed is 600r/min, the protective gas is decomposition gas of ammonia, specifically mixed gas with the volume ratio of hydrogen to nitrogen being 3:1, after the annealing is finished, carrying out electrostatic adsorption and uncovering on the protective film under the conditions that the electrostatic field is 15kV and the vertical distance between an electrostatic generator and the protective film is 5cm, then cleaning and trimming, and carrying out leveling by adopting a tension leveler under the conditions that the tension leveling speed is 50m/s and the elongation of the steel strip is less than or equal to 1.5% to obtain a stainless steel strip product with the thickness of 0.5 mm.
And (3) detecting the mechanical property of the prepared product, wherein the yield strength is 438Mpa, the tensile strength is 819Mpa, and the elongation after fracture is 63%.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (7)
1. A process for controlling the mechanical properties of a cold-rolled stainless steel strip is characterized by comprising the following steps:
s1: carrying out primary rolling on the stainless steel blank subjected to hot rolling, and rolling by using a cold rolling mill to obtain a primary rolled stainless steel band;
s2: removing oil stains on the surface of the primary rolled stainless steel strip, drying the primary rolled stainless steel strip, placing the primary rolled stainless steel strip in an annealing furnace, and carrying out primary annealing under the condition of applying a first pulse electromagnetic field;
s3: placing the bloomed stainless steel strip processed in the step S2 on a first finishing mill, and performing primary finish rolling by a first finishing roller;
s4: placing the bloomed stainless steel strip processed in the step S3 on a second finishing mill, and performing secondary finish rolling by a second finishing roll to obtain a finish-rolled stainless steel strip;
s5: removing oil stains on the surface of a finish-rolled stainless steel strip, drying, covering with a protective film, placing in an annealing furnace under the condition of applying a second pulse electromagnetic field, carrying out secondary annealing, removing the protective film by utilizing electrostatic adsorption, cleaning, trimming and flattening to obtain a stainless steel strip product, wherein the protective film is prepared by taking polyvinyl alcohol, short carbon fiber and tetraethoxysilane as raw materials, forming a film by electrostatic spinning, and then firing at a high temperature;
the preparation method of the protective film comprises the following steps:
a1: weighing polyvinyl alcohol powder, adding the polyvinyl alcohol powder into deionized water, standing for full swelling, magnetically stirring, heating to 70 ℃, preserving heat and stirring for 12 hours to prepare a polyvinyl alcohol solution with the mass fraction of 5-7%;
a2: respectively weighing ethyl orthosilicate, ethanol, water and anhydrous acetic acid according to the mass ratio of 10:7:0.6:0.06, stirring and mixing uniformly at the speed of 800-;
a3: mixing a polyvinyl alcohol solution and tetraethoxysilane according to a mass ratio of 1:1, continuously stirring for 5-10 hours at normal temperature, adding short carbon fibers, and continuously stirring and dispersing for 5-8 hours to obtain an electrostatic spinning solution;
a4: adding the electrostatic spinning solution into an electrostatic spinning machine, and carrying out electrostatic spinning under the conditions of spinning speed of 1ml/h, receiving distance of 20cm, spinning voltage of 25kV and spinning temperature of 25 ℃ to obtain an electrostatic spinning film;
a5: and (3) after vacuum drying the prepared electrostatic spinning membrane, heating to 800 ℃ at the speed of 5 ℃/min, calcining for 2h, and taking out along with the furnace after calcining to obtain the protective membrane.
2. The process for controlling the mechanical properties of the cold-rolled stainless steel strip as claimed in claim 1, wherein the electrostatic field of the electrostatic adsorption is 15-25kV, and the vertical distance between the electrostatic generator and the protective film is 5-8 cm.
3. A process for controlling the mechanical properties of a cold-rolled stainless steel strip according to any one of claims 1 to 2, wherein the thickness of the stainless steel blank is 2 to 2.5mm and the thickness of the stainless steel strip is 0.4 to 0.6 mm.
4. The process for controlling the mechanical property of the cold-rolled stainless steel strip as claimed in claim 3, wherein the annealing temperature of the primary annealing is 1050-.
5. The process for controlling the mechanical properties of a cold-rolled stainless steel strip according to claim 4, wherein the protective gas is a decomposition gas of ammonia, and the volume ratio of hydrogen to nitrogen is 3: 1.
6. The process for controlling the mechanical properties of the cold-rolled stainless steel strip as claimed in claim 5, wherein the magnetic induction intensity of the first pulsed electromagnetic field is 0.2-0.23T, the pulse frequency is 20Hz, the unidirectional pulse duty ratio is 20%, the magnetic induction intensity of the second pulsed electromagnetic field is 0.25-0.28T, the pulse frequency is 40Hz, and the unidirectional pulse duty ratio is 20%.
7. The process for controlling the mechanical properties of the cold-rolled stainless steel strip as claimed in claim 6, wherein the leveling step is performed by using a tension leveler, the tension leveling speed is 40-60m/s, and the elongation of the steel strip is less than or equal to 1.5%.
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