CN114833197B - Production method of low-cost stainless steel cold-rolled steel strip - Google Patents
Production method of low-cost stainless steel cold-rolled steel strip Download PDFInfo
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- CN114833197B CN114833197B CN202210420913.3A CN202210420913A CN114833197B CN 114833197 B CN114833197 B CN 114833197B CN 202210420913 A CN202210420913 A CN 202210420913A CN 114833197 B CN114833197 B CN 114833197B
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- 239000010935 stainless steel Substances 0.000 title claims abstract description 66
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 66
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 59
- 239000010960 cold rolled steel Substances 0.000 title claims abstract description 50
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 102
- 239000010959 steel Substances 0.000 claims abstract description 102
- 238000000137 annealing Methods 0.000 claims abstract description 71
- 238000003466 welding Methods 0.000 claims abstract description 60
- 238000005096 rolling process Methods 0.000 claims abstract description 51
- 238000005554 pickling Methods 0.000 claims abstract description 43
- 239000002253 acid Substances 0.000 claims abstract description 30
- 238000011282 treatment Methods 0.000 claims abstract description 28
- 238000005097 cold rolling Methods 0.000 claims abstract description 25
- 238000005238 degreasing Methods 0.000 claims abstract description 15
- 238000005098 hot rolling Methods 0.000 claims abstract description 15
- 238000005406 washing Methods 0.000 claims abstract description 5
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 57
- 229910017604 nitric acid Inorganic materials 0.000 claims description 57
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 50
- 238000000034 method Methods 0.000 claims description 29
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 28
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 28
- 235000011152 sodium sulphate Nutrition 0.000 claims description 28
- 230000003746 surface roughness Effects 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 18
- 238000004321 preservation Methods 0.000 claims description 12
- 238000000227 grinding Methods 0.000 claims description 9
- 210000001503 joint Anatomy 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 description 25
- 238000001816 cooling Methods 0.000 description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 230000001680 brushing effect Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 5
- 238000005461 lubrication Methods 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 4
- 229910010271 silicon carbide Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 241000251468 Actinopterygii Species 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
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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
- B21B1/24—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 in a continuous or semi-continuous process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/02—Winding-up or coiling
- B21C47/04—Winding-up or coiling on or in reels or drums, without using a moving guide
-
- 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
- C21D8/0221—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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
-
- 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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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Metal Rolling (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a production method of a stainless steel cold-rolled steel strip, which comprises the following steps: (1) Conveying the stainless steel black skin steel coil obtained by hot rolling to a cold rolling mill for rolling to obtain a cold rolled steel coil; (2) Welding the cold-rolled steel coils adjacent to each other before and after each other, and degreasing; (3) The steel coil subjected to degreasing treatment enters an annealing furnace to be subjected to low-temperature annealing treatment; (4) carrying out acid washing treatment on the steel coil subjected to the low-temperature annealing treatment; (5) And conveying the steel coil subjected to the pickling treatment to a leveling machine for online leveling. The production method can reduce the production cost of the stainless steel cold-rolled steel strip, reduce the energy consumption in the production process and improve the production efficiency.
Description
Technical Field
The invention relates to the technical field of stainless steel production, in particular to a production method of a low-cost stainless steel cold-rolled steel strip.
Background
Stainless steel is characterized by being mainly stainless and corrosion resistant, and has a chromium content of at least 10.5% and a carbon content of at most 1.2%, and is classified into austenitic steel, ferritic steel, martensitic steel, austenitic-ferritic duplex steel, precipitation hardening stainless steel, and the like in terms of a structure state.
The conventional production flow of the stainless steel cold-rolled steel strip is as follows: the hot-rolled black skin material is annealed and pickled, cold-rolled, annealed and pickled, flattened, and is the production flow of most conventional stainless steel cold-rolled steel strips, and the production equipment of a stainless steel production plant is basically matched with the conventional process. However, the production process has the defects of high production cost and long production time.
On the other hand, the production of the stainless steel strip is an energy consumption process, the annealing needs to burn gas to ensure the annealing temperature, the treatment of pickling waste also needs a complex flow, and the operation of production equipment consumes a large amount of electric energy and the like.
Therefore, the production method for the stainless steel cold-rolled steel strip with low cost and low energy consumption is an urgent problem to be solved at present.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a production method of a stainless steel cold-rolled steel strip, which can reduce the production cost, reduce the energy consumption in the production process and improve the production efficiency.
Specifically, the invention is realized by the following technical scheme:
a production method of a stainless steel cold-rolled steel strip comprises the following steps:
(1) Conveying the stainless steel black skin steel coil obtained by hot rolling to a cold rolling mill for rolling to obtain a cold rolled steel coil;
(2) Welding the cold-rolled steel coils adjacent to each other before and after each other, and degreasing;
(3) The steel coil subjected to degreasing treatment enters an annealing furnace to be subjected to low-temperature annealing treatment;
(4) Carrying out pickling treatment on the steel coil subjected to the low-temperature annealing treatment;
(5) And conveying the steel coil subjected to the pickling treatment to a leveling machine for online leveling.
Optionally, in the step (1), the rolling thickness deformation rate is 50% -80%, the rolling pass is 5-15, and the single pass deformation rate is 5-25%.
Optionally, in step (1), the cold rolling mill is a twenty-high cold rolling mill;
the first pass of rolling adopts a rough grinding roller with the roughness of 0.8-1.2 mu m as a rolling working roller, and the other passes adopt flat rollers with the roughness of 0.3-0.5 mu m as rolling working rollers.
Optionally, the thickness of the stainless steel cold-rolled steel strip is 0.3-2.5 mm, and in the step (2), the cold-rolled steel coils adjacent to each other in front and back are welded by adopting roller resistance welding, wherein the lap joint amount of the cold-rolled steel coils adjacent to each other in front and back is 1-3 mm, the welding speed is 5-11 m/min, and the welding current is 3000-25000A.
Optionally, the thickness of the stainless steel cold-rolled steel strip is 0.8-8.0 mm, and in the step (2), adjacent cold-rolled steel coils are welded in a butt joint mode by adopting MIG welding, wherein the gap between the adjacent cold-rolled steel coils is not more than 2mm, the welding speed is 0.8-1.5 m/min, the voltage is 27-31V, the adopted welding wire is ER309L with the diameter of 1.2mm, and the wire feeding speed of the welding wire is 8-14 m/min.
Optionally, in the step (3), the temperature of the low-temperature annealing treatment is reduced by 10-80 ℃ based on the annealing temperature of the stainless steel white skin coil cold-rolled material, and the heat preservation time in the annealing furnace is 1.0-3.0 min/mm.
Optionally, in the step (4), acid washing is performed by adopting electrolytic sodium sulfate, electrolytic nitric acid and mixed acid of nitric acid and hydrofluoric acid;
Wherein, the concentration of sodium sulfate in the electrolytic sodium sulfate is 1.12-1.20 g/L, the electrolytic current is 4000-6000A, the temperature is 65-85 ℃, the concentration of nitric acid in the electrolytic nitric acid is 90-150 g/L, the electrolytic current is 4000-6000A, the temperature is 30-60 ℃, the concentration of nitric acid in the mixed acid of nitric acid and hydrofluoric acid is 120-180 g/L, the concentration of hydrofluoric acid is 15-25 g/L, and the temperature is 30-50 ℃; or the concentration of sodium sulfate in the electrolytic sodium sulfate is 1.12-1.20 g/L, the electrolytic current is 4000-6000A, the temperature is 65-85 ℃, the concentration of nitric acid in the electrolytic nitric acid is 120-180 g/L, the electrolytic current is 4000-6000A, the temperature is 30-60 ℃, the concentration of nitric acid in the mixed acid of nitric acid and hydrofluoric acid is 120-220 g/L, the concentration of hydrofluoric acid is 15-30 g/L, and the temperature is 30-55 ℃.
Optionally, in step (5), the leveling roll of the leveling machine has a roughness of 0.04-0.2 μm, a leveling pressure of 150-900 tons, and an elongation of 0.2-2.0%.
Alternatively, the stainless steel cold-rolled strip is a stainless steel having the designations 201, 304, 316, 410, 430, 409, 443, or Cr 13.
Alternatively, the stainless steel cold-rolled strip has a thickness of 0.3 to 8.0mm, a width of 900 to 2000mm, and a surface roughness of 0.7 μm or less and preferably 0.2 μm or less.
Compared with the prior art, the production method of the stainless steel cold-rolled steel strip has at least the following beneficial effects:
(1) The invention develops a novel production process of the stainless steel cold-rolled steel strip by utilizing the existing stainless steel strip production equipment, and the stainless steel cold-rolled steel strip produced by adopting the process is directly cold-rolled by adopting the hot-rolled black skin material, so that one hot-rolled annealing and pickling process can be reduced, the energy consumption is reduced, the total production time is shortened by 20-30% compared with the conventional stainless steel cold-rolled plate, and the total production cost is reduced by 500-1500 yuan/ton compared with the conventional stainless steel cold-rolled plate.
(2) The thickness precision control level of the stainless steel cold-rolled steel strip produced by the process is consistent with that of the stainless steel cold-rolled steel strip obtained by the conventional process, and the thickness fluctuation of the whole coil can be controlled within +/-5 mu m.
(3) The stainless steel cold-rolled steel strip produced by the process has qualified surface pickling, no iron scale residue, and the surface roughness Ra of 0.2-0.7 mu m (the roughness Ra after multiple flattening can reach below 0.2 mu m), and is the same as the roughness of the stainless steel cold-rolled steel strip obtained by the conventional process.
(4) The stainless steel cold-rolled steel strip produced by the process has the unevenness within 6mm/m, and is consistent with the stainless steel cold-rolled steel strip obtained by the conventional process.
(5) The mechanical properties of the stainless steel cold-rolled steel strip produced by the process of the invention meet the requirements of GB/T3280, JIS G4305, EN 10088 and other standards.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. In the drawings:
FIG. 1 shows the surface morphology of a cold rolled stainless steel strip prepared in example 1 of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments for a full understanding of the objects, features, and effects of the present invention. The process of the present invention is carried out by methods or apparatus conventional in the art, except as described below. The following terms have the meanings commonly understood by those skilled in the art unless otherwise indicated.
Aiming at the problems of high cost, high energy consumption, low production efficiency, long production period and the like in the conventional stainless steel cold-rolled steel strip production process, the inventor of the invention has conducted intensive study on the process and found that:
In the conventional production process of the stainless steel cold-rolled steel strip, hot rolling annealing pickling is firstly carried out to clean oxide skin on the surface, a key device for eliminating the oxide skin in the hot rolling annealing pickling process is a scale breaker, and the working principle of the scale breaker is to stretch the steel strip to deform with the elongation of 0.3-3%, so that the oxide skin is separated from a steel strip substrate, and the aim of dephosphorization is achieved. The cold rolling mill reduces the thickness of the steel strip through the double functions of tension and pressure, and if the hot rolling black skin material is directly subjected to cold rolling, the effect of scale breaking can be achieved by matching with specific cold rolling process conditions. On the other hand, although the surface scale of the black skin material part subjected to cold rolling falls off, a large amount of scale remains, the surface scale is further increased after annealing, the surface scale cannot be cleaned by pickling by adopting a conventional pickling process, and the surface roughness is also higher, so that the annealing process, the pickling medium, the process and the flattening process need to be further adjusted.
Based on the above conception, the invention provides a production method of a stainless steel cold-rolled steel strip, which comprises the following steps: (1) Conveying the stainless steel black skin steel coil obtained by hot rolling to a cold rolling mill for rolling to obtain a cold rolled steel coil; (2) Welding the cold-rolled steel coils adjacent to each other before and after each other, and degreasing; (3) The steel coil subjected to degreasing treatment enters an annealing furnace to be subjected to low-temperature annealing treatment; (4) carrying out acid washing treatment on the steel coil subjected to the low-temperature annealing treatment; (5) And conveying the steel coil subjected to the pickling treatment to a leveling machine for online leveling.
The production method of the stainless steel cold-rolled steel strip can produce stainless steel with the grades of 201, 304, 316, 410, 430, 409, 443, cr13 system and the like, obtain a cold-rolled steel coil with the thickness range of 0.3-8.0 mm and the width range of 900-2000 mm, has the surface roughness similar to that of the conventional process materials, and has the mechanical property meeting the requirement of GB/T3280 standard.
As a preferred embodiment, the method for producing a stainless steel cold-rolled steel strip of the present invention comprises the steps of:
(1) And directly cold-rolling the stainless steel hot-rolled black steel coil in a hot-rolled unannealed state.
In the invention, the black skin steel coil or black skin material refers to a steel coil obtained by hot rolling, and the name is obtained by the existence of a layer of black oxide skin on the surface of the steel coil before the steel coil is subjected to annealing, pickling and other treatments.
In the present invention, the hot rolling process can refer to related schemes of the prior art, and in actual production, a person skilled in the art can select an appropriate hot rolling process according to needs, which will not be described herein.
In this step, the hot rolled, unannealed stainless steel roll is transported to a twenty-high cold rolling mill (e.g., a sendzimir twenty-high cold rolling mill) for rolling. Because the head and the tail of the hot-rolled black skin coil are in a fish head shape, the hot-rolled black skin coil cannot be directly coiled on a winding drum after being worn on a rolling mill, and a coil assisting machine is needed to be adopted for coiling.
In the rolling process, oil lubrication is adopted, the rolling thickness deformation rate is 50% -80%, the rolling passes are 5-15, and the single pass deformation rate is 5-25%. The working rolls of the cold rolling mill are set as follows: the first pass of rolling adopts a rough grinding roller with the roughness of 0.8-1.2 mu m as a rolling working roller, and the other passes adopt flat rollers with the roughness of 0.3-0.5 mu m as rolling working rollers.
The conventional stainless steel cold-rolled sheet is characterized in that a black skin coil is firstly annealed and pickled and then cold-rolled, but in the invention, the stainless steel black skin coil is directly cold-rolled without being annealed and pickled, so that a novel cold-rolled steel strip production process route is developed, and the whole hot-rolled annealing and pickling procedures in the conventional stainless steel cold-rolled sheet production process are reduced, which is the key for reducing the cost.
(2) And (5) welding and degreasing the cold-rolled steel coil.
After a steel coil is opened on an uncoiler, the front and rear non-rolled parts are cut clean, the front and rear adjacent steel coils are welded on line, and the welding modes are divided into two modes according to the thickness of materials:
For the steel strip with the thickness of less than or equal to 0.3mm and less than or equal to 0.8mm, roller resistance welding is adopted, the front steel strip and the rear steel strip are lapped, the oxide skin at the welding seam is required to be polished by a polisher before welding, the lap joint amount of the welding seam is 1-3 mm, the welding speed is 5-11 m/min, and the welding current is 3000-25000A. For the steel strip with the thickness of 0.3-2.5 mm, roller resistance welding is adopted, but after cold rolling, a layer of oxide skin exists on the surface of the hot-rolled black skin material, and the surface cannot be directly welded through resistance welding, so that a special grinding machine is required to grind the oxide skin at the welding seam, and one-time welding success can be realized after grinding.
For the steel strip with the thickness less than or equal to 2.5mm and less than or equal to 8.0mm, MIG welding (namely consumable electrode inert gas shielded welding) is adopted, the front steel strip and the rear steel strip are in butt joint, the gap is 0-2 mm, the welding speed is 0.8-1.5 m/min, the voltage is 27-31V, the welding wire adopts ER309L with the diameter of 1.2mm, and the wire feeding speed is 8-14 m/min.
For steel strips with a thickness of 0.8mm < 2.5mm, both welding methods are applicable.
Degreasing the welded steel strip, and then entering an annealing and pickling production line. The degreasing treatment may be performed with reference to a scheme in the prior art, and will not be described here.
(3) And (5) low-temperature annealing treatment.
And (5) the degreased steel strip enters an annealing furnace to be subjected to low-temperature annealing treatment.
In order to reduce the formation of oxide skin on the surface of the steel belt at high temperature, the annealing temperature is reduced as much as possible on the premise of ensuring the qualified mechanical property. Compared with the white skin coil (namely, the coil obtained by annealing, pickling, cold rolling and the like of the hot rolled coil) obtained by the conventional process, the annealing temperature adopted by the invention is reduced by 10-80 ℃ compared with the annealing temperature of the white skin coil, and the heat preservation time in the annealing furnace is 1.0-3.0 min/mm. For example, when the stainless steel grade is 410 or 430, the annealing temperature is 800-860 ℃; when the stainless steel brand is 304, the annealing temperature is 1030-1130 ℃; when the stainless steel mark is 409, the annealing temperature is 870-935 ℃; when the stainless steel brand is 443, the annealing temperature is 910-980 ℃.
After the high-temperature heat preservation is finished, rapidly cooling by adopting fog cooling and air cooling, and outputting the steel strip from the annealing furnace after cooling to below 120 ℃.
In the step, the annealing temperature is lower than that of the conventional white skin roll, but the production speed is not lower than that of the conventional white skin roll, so that the generation of oxide skin in the annealing process can be effectively reduced.
(4) And (5) acid washing treatment.
The annealed steel coil is pickled, and the mixed acid of electrolytic sodium sulfate, electrolytic nitric acid, nitric acid and hydrofluoric acid is adopted for pickling, and specific parameters can be selected according to the brand of stainless steel.
For example, when the stainless steel grade is 410 or 430, the concentration of sodium sulfate in the electrolytic sodium sulfate is 1.12 to 1.20g/L, the electrolytic current is 4000 to 6000A, the temperature is 65 to 85 ℃, the concentration of nitric acid in the electrolytic nitric acid is 90 to 150g/L, the electrolytic current is 4000 to 6000A, the temperature is 30 to 60 ℃, the concentration of nitric acid in the mixed acid of nitric acid and hydrofluoric acid is 120 to 180g/L, the concentration of hydrofluoric acid is 15 to 25g/L, and the temperature is 30 to 50 ℃. When the stainless steel brand is 304, the concentration of sodium sulfate in the electrolytic sodium sulfate is 1.12-1.20 g/L, the electrolytic current is 4000-6000A, the temperature is 65-85 ℃, the concentration of nitric acid in the electrolytic nitric acid is 120-180 g/L, the electrolytic current is 4000-6000A, the temperature is 30-60 ℃, the concentration of nitric acid in the mixed acid of nitric acid and hydrofluoric acid is 120-220 g/L, the concentration of hydrofluoric acid is 15-30 g/L, and the temperature is 30-55 ℃.
Brushing the surfaces of the steel strips by brush rolls made of silicon carbide at the outlet of the electrolytic sodium sulfate tank, the outlet of the electrolytic nitric acid tank and the outlet of the mixed acid tank respectively.
The surface of the steel belt is brushed by adopting a brush roll made of silicon carbide materials at specific concentration and temperature, so that the steel belt is pickled cleanly and no iron scale remains.
(5) And (5) leveling on line.
And (3) carrying out large-pressure online leveling on the annealed and pickled steel coil in a cold rolling and pickling line so as to improve the surface roughness and the shape of the steel belt, leveling by adopting a 2-roller leveling machine, wherein the roughness of the leveling roller is Ra0.04-0.2 mu m, the leveling pressure is 150-900 tons, the elongation is 0.2-2.0%, and the leveled steel coil is directly subjected to online intersection.
In order to improve the surface roughness and the plate shape of the annealed steel strip, the step adopts large-pressure leveling, the plate shape is flat, the surface roughness is Ra0.2-0.7 mu m, and the roughness Ra can be below 0.2 mu m after multiple leveling.
The invention is mainly based on the following findings or research results of the inventor:
The first pass adopts the rough grinding roller, so that the surface roughness of the rough grinding roller is relatively high, and the oxide skin on the surface of the steel belt can be damaged to a certain extent, thereby increasing the effect of falling the oxide skin in the rolling process.
Other passes adopt flat rollers with roughness of Ra0.3-0.5 mu m, and mainly ensure that the surface roughness of the finished product after rolling cannot be too high.
The total rolling deformation rate is about 10% lower than that of the conventional material, mainly considering that the generation of surface oxide skin is reduced in the next annealing step, the annealing temperature is lower than that of the conventional material, and the proper reduction of the deformation rate can ensure the recovery of the annealed structure.
The roughness of the leveling roller is smaller than that of the conventional 2B material; the flattening pressure and the extensibility are larger than those of the conventional 2B material, and the flattening pressure and the extensibility are mainly used for reducing the surface roughness of the finished product and improving the brightness and the surface quality.
Examples
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention. The experimental methods, in which specific conditions are not noted in the following examples, were selected according to conventional methods and conditions, or according to the commercial specifications.
Example 1:
The unannealed 06Cr13 black skin hot rolled coil with the thickness of 4.0mm and the width of 1258mm is used as a raw material, and the chemical components of the hot rolled coil are as follows in percentage by mass: c:0.0334%, cr:13.3306%, si:0.7168%, mn:0.3544%, ni:0.1109%, P:0.0317%, S:0.001%, N:0.0151%, and the balance of Fe and other unavoidable impurities.
The production method comprises the following steps:
(1) Hot rolling the 06Cr13 black skin steel coil in an unannealed state, directly carrying out cold rolling on a Send-Mier twenty-high roll mill, wherein the head and the tail of the hot rolled black skin steel coil are fish head-shaped, and cannot be directly coiled on a winding drum after passing through the rolling mill, so that a coil assisting machine is needed to be adopted for coiling; in the rolling process, oil lubrication is adopted, the rolling thickness deformation rate is 50%, namely the thickness after rolling is 2.0mm, the single-pass deformation rate is 8-18%, the deformation rate of each pass can be the same as that of a conventional material, two rough grinding rollers with the roughness Ra of 1.02 mu m and 1.005 mu m are adopted in the first pass of a rolling working roller, flat rollers with the roughness Ra=0.3-0.5 mu m are adopted in other passes (specifically, 4 flat rollers are adopted in the embodiment, the roughness Ra of 0.366 mu m, 0.372 mu m, 0.375 mu m and 0.366 mu m are adopted in the embodiment), and other rolling parameters are the same as those of the 06Cr13 pickling white skin coil in a rolling annealed state.
(2) And (3) carrying out annealing and pickling operation on the rolled 06Cr13 steel coil in a cold rolling annealing and pickling production line. After the steel coil is opened on the uncoiler, the head and tail non-rolled parts are cut clean, the front steel coil and the rear steel coil are welded on line in a roller resistance lap welding mode, the oxide skin at the welding seam is required to be polished clean by a special polisher before welding, the lap joint amount of the welding seam is 2mm, the welding speed is 7.8m/min, and the welding current is 16000A.
(3) And (3) after degreasing, annealing in an annealing furnace, wherein the annealing temperature is reduced as much as possible on the premise of ensuring the qualified mechanical properties in order to reduce the formation of oxide skin on the surface of the steel strip at high temperature. The furnace temperature is controlled to be 815 ℃, and the heat preservation time in the furnace is 1.8min/mm; and after the high-temperature heat preservation is finished, rapidly cooling by adopting fog cooling and air cooling, and discharging the steel belt after cooling to below 120 ℃.
(4) The annealed steel coil is pickled, and mixed acid of electrolytic sodium sulfate, electrolytic nitric acid, nitric acid and hydrofluoric acid is adopted for pickling, wherein the concentration of sodium sulfate is 1.12g/L, the electrolytic current is 5000A, and the temperature is 70 ℃; the concentration of nitric acid in the electrolytic nitric acid is 170g/L, the electrolytic current is 5000A, and the temperature is 50 ℃; the concentration of nitric acid in the mixed acid is 170g/L, the concentration of hydrofluoric acid is 18g/L, and the temperature is 35 ℃. Brushing the surfaces of the steel strips by brush rolls made of silicon carbide at the outlet of the electrolytic sodium sulfate tank, the outlet of the electrolytic nitric acid tank and the outlet of the mixed acid tank respectively.
(5) And (3) carrying out high-pressure leveling on the annealed and pickled steel coil to improve the surface roughness and the plate shape of the steel belt, leveling by adopting a 2-roller leveling machine, wherein the roughness of the leveling roller is Ra0.05 mu m, the leveling pressure is 650 tons, and the elongation is 0.8%.
(6) And cutting the part with defects at the head and the tail of the flattened steel coil on a slitting unit, and packaging and intersecting.
FIG. 1 shows the surface morphology of the cold-rolled stainless steel strip produced in example 1. As can be seen from FIG. 1, the steel strip has high surface quality and no scale residue.
The surface roughness of the finished product of the embodiment is Ra 0.5-0.6 mu m, the elongation A50 = 32%, the yield strength Rp0.2 = 275MPa, the tensile strength Rm = 502MPa, and the mechanical property meets the requirements of GB/T3280.
Comparative example 1
Comparative example 1 is similar to the overall process of example 1, except that:
The unannealed 06Cr13 black skin hot rolled coil with the thickness of 5.0mm and the width of 1260mm is used as a raw material, and the chemical components of the hot rolled coil are as follows in percentage by mass: c:0.0289%, cr:13.1511%, si:0.7889%, mn:0.3445%, ni:0.1368%, P:0.0126%, S:0.0016%, N:0.0297%, the balance being Fe and other unavoidable impurities.
The process is as follows:
(1) Annealing and pickling the 06Cr13 black steel coil:
Hot rolling a 06Cr13 black steel coil in an unannealed state, carrying out annealing pickling on a hot rolling annealing pickling production line, welding front and rear steel belts by adopting MIG welding, controlling the length of an annealing furnace to be 80m, controlling the furnace temperature according to 850 ℃, and the production speed to be 40m/min, wherein sulfuric acid and mixed acid (nitric acid and hydrofluoric acid) are adopted for pickling, wherein the concentration of sulfuric acid is 231g/L, the temperature is 80 ℃, the concentration of nitric acid is 82g/L, the concentration of hydrofluoric acid is 2.1g/L, and the mixed acid temperature is 25 ℃.
(2) The annealing and pickling are carried out on a Send-Mier twenty-high roll mill, oil lubrication is adopted in the rolling process, the rolling thickness deformation rate is 60%, namely the thickness after rolling is 2.0mm, a flat roll with the roughness Ra=0.3-0.5 mu m is adopted in the rolling process, 6 flat rolls are used for 9 times of rolling, and the roughness Ra=0.355/0.363/0.366/0.372/0.354/0.371 mu m is respectively adopted.
(3) And (3) carrying out annealing and pickling operation on the rolled 06Cr13 steel coil in a cold rolling annealing and pickling production line. After the steel coil is opened on an uncoiler, the rolling parts at the head and the tail are cut off, the front steel coil and the rear steel coil are welded on line in a roller resistance lap welding mode, direct welding is performed, the lap joint amount of the welding line is 2mm, the welding speed is 8.0m/min, and the welding current is 16000A.
(4) And (5) degreasing, and then, annealing in an annealing furnace. The furnace temperature is controlled to 860 ℃, and the heat preservation time in the furnace is 1.8min/mm; and after the high-temperature heat preservation is finished, rapidly cooling by adopting fog cooling and air cooling, and discharging the steel belt after cooling to below 120 ℃.
(5) The annealed steel coil is pickled, and mixed acid of electrolytic sodium sulfate, electrolytic nitric acid, nitric acid and hydrofluoric acid is adopted for pickling, wherein the concentration of sodium sulfate is 1.12g/L, the electrolytic current is 4000A, and the temperature is 70 ℃; the concentration of nitric acid in the electrolytic nitric acid is 166g/L, the electrolytic current is 4000A, and the temperature is 50 ℃; the concentration of nitric acid in the mixed acid is 110g/L, the concentration of hydrofluoric acid is 4g/L, and the temperature is 28 ℃. Brushing the surface of the steel belt by brush rolls made of common PP materials at the outlet of the electrolytic sodium sulfate tank, the outlet of the electrolytic nitric acid tank and the outlet of the mixed acid tank respectively.
(6) And flattening the annealed and pickled steel coil, wherein the flattening is performed by adopting a 2-roller flattening machine, the roughness of the flattening roller is Ra0.05mu m, the flattening pressure is 450 tons, and the elongation is 0.4%.
(7) And cutting the part with defects at the head and the tail of the flattened steel coil on a slitting unit, and packaging and intersecting.
The surface roughness of the surface finished product is Ra=0.49-0.55 mu m, the elongation A50=29%, the yield strength Rp0.2=301 MPa, the tensile strength Rm=524 MPa
Compared with comparative example 1, the total production time is shortened by 25% compared with the conventional 06Cr13 cold-rolled sheet, the total production cost is reduced by 700 yuan/ton compared with the conventional 06Cr13 cold-rolled sheet, and the surface roughness, the elongation, the yield strength, the tensile strength and the like of the product are similar to or better than those of comparative example 1.
Example 2:
The unannealed SUS430 black skin hot rolled coil with the thickness of 3.0mm and the width of 1262mm is used as a raw material, and the chemical components in percentage by mass are as follows: c:0.0316%, cr:16.2731%, si:0.3189%, mn:0.2783%, ni:0.0940%, P:0.0285%, S:0.0035%, N:0.0394% and the balance of Fe and other unavoidable impurities.
The production method comprises the following steps:
(1) Hot rolling the SUS430 black skin steel coil in an unannealed state, directly carrying out cold rolling on a Send Mier twenty-high roll mill, wherein the head and the tail of the hot rolled black skin steel coil are shaped like fish heads, and cannot be directly coiled on a winding drum after passing through the rolling mill, so that a coil assisting machine is needed to be adopted for coiling; in the rolling process, oil lubrication is adopted, the rolling thickness deformation rate is 60%, namely the thickness after rolling is 1.2mm, the total rolling is 7 times, the single-pass deformation rate is 10-22%, the first pass of the rolling working roll adopts two rough grinding rolls with the roughness Ra of 1.03 mu m and 1.022 mu m respectively, the other passes adopt flat rolls with the roughness Ra of 0.3-0.5 mu m (specifically, the embodiment adopts 4 flat rolls with the roughness Ra of 0.371 mu m, 0.377 mu m, 0.384 mu m and 0.36 mu m respectively), and other rolling parameters are the same as those of the SUS430 pickled white skin roll in a rolling conventional annealing state.
(2) And (3) carrying out annealing and pickling operation on the rolled SUS430 steel coil in a cold rolling annealing and pickling production line. After the steel coil is opened on an uncoiler, the head and tail non-rolled parts are cut clean, the front and rear steel coils are welded on line in a roller resistance lap welding mode, the oxide skin at the welding seam is required to be polished clean by a special polisher before welding, the lap joint amount of the welding seam is 2.0mm, the welding speed is 7.8m/min, and the welding current is 15000A.
(3) And (3) after degreasing, annealing in an annealing furnace, wherein the annealing temperature is reduced as much as possible on the premise of ensuring the qualified mechanical properties in order to reduce the formation of oxide skin on the surface of the steel strip at high temperature. The furnace temperature is controlled to 825 ℃, and the heat preservation time in the furnace is 1.3min/mm; and after the high-temperature heat preservation is finished, rapidly cooling by adopting fog cooling and air cooling, and discharging the steel belt after cooling to below 120 ℃.
(4) The annealed steel coil is pickled, and mixed acid of electrolytic sodium sulfate, electrolytic nitric acid, nitric acid and hydrofluoric acid is adopted for pickling, wherein the concentration of sodium sulfate is 1.12g/L, the electrolytic current is 5000A, and the temperature is 70 ℃; the concentration of nitric acid in the electrolytic nitric acid is 180g/L, the electrolytic current is 5000A, and the temperature is 50 ℃; the concentration of nitric acid in the mixed acid is 180g/L, the concentration of hydrofluoric acid is 18g/L, and the temperature is 35 ℃. Brushing the surfaces of the steel strips by brush rolls made of silicon carbide at the outlet of the electrolytic sodium sulfate tank, the outlet of the electrolytic nitric acid tank and the outlet of the mixed acid tank respectively.
(5) And (3) carrying out high-pressure leveling on the annealed and pickled steel coil to improve the surface roughness and the plate shape of the steel belt, leveling by adopting a 2-roller leveling machine, wherein the roughness of the leveling roller is Ra0.05 mu m, the leveling pressure is 650 tons, and the elongation is 0.8%.
(6) And cutting the part with defects at the head and the tail of the flattened steel coil on a slitting unit, and packaging and intersecting.
The surface roughness ra=0.45-0.52 μm, the elongation a50=31.5%, the yield strength rp0.2=337 MPa, the tensile strength rm=485 MPa, and the mechanical properties of the finished product of the embodiment satisfy the requirements of JIS G4305.
Comparative example 2:
The annealed 430 black skin hot rolled coil with the thickness of 4.0mm and the width of 1262mm is taken as a raw material, and comprises the following chemical components in percentage by mass: c:0.0372%, cr:16.2660%, si:0.2792%, mn:0.3088%, ni:0.1357%, P:0.0226%, S:0.0032%, N:0.0356%, and the balance of Fe and other unavoidable impurities.
The process is as follows:
(1) Pickling the 430 black steel coil:
and (3) pickling the 430 black skin steel coil in an annealed state on a hot rolling annealing pickling production line, welding the front and rear steel strips by adopting MIG welding at a production speed of 38m/min, and pickling by adopting sulfuric acid and mixed acid (nitric acid and hydrofluoric acid), wherein the concentration of sulfuric acid is 262g/L, the temperature is 82 ℃, the concentration of nitric acid is 107g/L, the concentration of hydrofluoric acid is 4.3g/L, and the mixed acid temperature is 44 ℃.
(2) The annealing and pickling are carried out on a Shangsen-Mier twenty-high roll mill, oil lubrication is adopted in the rolling process, the rolling thickness deformation rate is 70%, namely, the thickness after rolling is 1.2mm, a flat roll with the roughness Ra=0.3-0.5 mu m is adopted in the rolling process, 6 flat rolls are used for 9 times of rolling, and the roughness is Ra=0.381/0.344/0.362/0.355/0.364/0.368 mu m respectively.
(3) And (5) carrying out annealing and pickling operation on the rolled 430 steel coil in a cold rolling annealing and pickling production line. After the steel coil is opened on an uncoiler, the head and tail non-rolled parts are cut off, the front and rear steel coils are welded on line in a roller resistance lap welding mode, the steel coil is directly welded, the lap joint amount of the welding line is 2mm, the welding speed is 8.0m/min, and the welding current is 15000A.
(4) And (5) degreasing, and then, annealing in an annealing furnace. The furnace temperature is controlled to 860 ℃, and the heat preservation time in the furnace is 1min/mm; and after the high-temperature heat preservation is finished, rapidly cooling by adopting fog cooling and air cooling, and discharging the steel belt after cooling to below 120 ℃.
(5) Pickling the annealed steel coil, namely pickling the steel coil by adopting mixed acid of electrolytic sodium sulfate and electrolytic nitric acid, wherein the concentration of sodium sulfate is 1.12g/L, the electrolytic current is 4000A, and the temperature is 70 ℃; the concentration of nitric acid in the electrolytic nitric acid is 172g/L, the electrolytic current is 4000A, and the temperature is 50 ℃. Brushing the surface of the steel belt by brush rolls made of common PP materials at the outlet of the electrolytic sodium sulfate tank, the outlet of the electrolytic nitric acid tank and the outlet of the mixed acid tank respectively.
(6) And flattening the annealed and pickled steel coil, wherein the flattening is performed by adopting a 2-roller flattening machine, the roughness of the flattening roller is Ra0.05mu m, the flattening pressure is 400 tons, and the elongation is 0.5%.
(7) And cutting the part with defects at the head and the tail of the flattened steel coil on a slitting unit, and packaging and intersecting.
The surface finished product of this comparative example has a surface roughness ra=0.36 to 0.40 μm, an elongation a50=28%, a yield strength rp 0.2=280 MPa, and a tensile strength rm=496 MPa
Comparing example 2 with comparative example 2, the total production time is shortened by 25% compared with the conventional SUS430 cold-rolled sheet, the total production cost is reduced by 700 yuan/ton compared with the conventional SUS430 cold-rolled sheet, and the surface roughness, elongation, yield strength, tensile strength and the like of the finished product are similar to or better than those of comparative example 2.
The foregoing examples are illustrative of the present invention and are not intended to be limiting, and any other substitutions, modifications, combinations, alterations, simplifications, etc. which do not depart from the spirit and principles of the present invention are intended to be within the scope of the present invention.
Claims (5)
1. The production method of the stainless steel cold-rolled steel strip is characterized by comprising the following steps of:
(1) Conveying the stainless steel black skin steel coil obtained by hot rolling to a cold rolling mill for rolling to obtain a cold rolled steel coil;
Wherein the rolling thickness deformation rate is 50% -80%, the rolling passes are 5-15, and the single pass deformation rate is 5-25%; the cold rolling mill is a twenty-roller cold rolling mill, a rough grinding roller with the roughness of 0.8-1.2 mu m is adopted as a rolling working roller in the first pass of rolling, and a flat roller with the roughness of 0.3-0.5 mu m is adopted as the rolling working roller in the other passes;
(2) Welding the cold-rolled steel coils adjacent to each other before and after each other, and degreasing;
(3) The steel coil subjected to degreasing treatment enters an annealing furnace to be subjected to low-temperature annealing treatment;
the temperature of the low-temperature annealing treatment is reduced by 10-80 ℃ on the basis of the annealing temperature of the stainless steel white skin coil cold-rolled material, and the heat preservation time in the annealing furnace is 1.0-3.0 min/mm;
(4) Acid washing treatment is carried out on the steel coil subjected to the low-temperature annealing treatment by adopting mixed acid of electrolytic sodium sulfate, electrolytic nitric acid, nitric acid and hydrofluoric acid;
Wherein the concentration of sodium sulfate in the electrolytic sodium sulfate is 1.12-1.20 g/L, the electrolytic current is 4000-6000A, the temperature is 65-85 ℃, the concentration of nitric acid in the electrolytic nitric acid is 90-150 g/L, the electrolytic current is 4000-600A, the temperature is 30-60 ℃, the concentration of nitric acid in the mixed acid of nitric acid and hydrofluoric acid is 120-180 g/L, the concentration of hydrofluoric acid is 15-25 g/L, and the temperature is 30-50 ℃; or the concentration of sodium sulfate in the electrolytic sodium sulfate is 1.12-1.20 g/L, the electrolytic current is 4000-6000A, the temperature is 65-85 ℃, the concentration of nitric acid in the electrolytic nitric acid is 120-180 g/L, the electrolytic current is 4000-600A, the temperature is 30-60 ℃, the concentration of nitric acid in the mixed acid of nitric acid and hydrofluoric acid is 120-220 g/L, the concentration of hydrofluoric acid is 15-30 g/L, and the temperature is 30-55 ℃;
(5) Conveying the steel coil subjected to the pickling treatment to a leveling machine for online leveling;
Wherein the roughness of a leveling roller of the leveling machine is 0.04-0.2 mu m, the leveling pressure is 150-900 tons, and the elongation is 0.2-2.0%;
Wherein the stainless steel cold-rolled steel strip is stainless steel with the marks of 201, 304, 316, 410, 430, 409, 443 or Cr 13.
2. The production method of claim 1, wherein the thickness of the stainless steel cold-rolled steel strip is 0.3-2.5 mm, and in the step (2), the cold-rolled steel coils adjacent to each other in front and back are welded by adopting roller resistance welding, wherein the overlap of the cold-rolled steel coils adjacent to each other in front and back is 1-3 mm, the welding speed is 5-11 m/min, and the welding current is 3000-25000A.
3. The production method of claim 1, wherein the thickness of the stainless steel cold-rolled steel strip is 0.8-8.0 mm, and in the step (2), adjacent cold-rolled steel coils are welded in a butt joint manner by adopting MIG welding, wherein the gap between the adjacent cold-rolled steel coils is not more than 2mm, the welding speed is 0.8-1.5 m/min, the voltage is 27-31V, the diameter of a welding wire is 1.2mm, and the wire feeding speed of the welding wire is 8-14 m/min.
4. The method according to claim 1, wherein the stainless steel cold-rolled strip has a thickness of 0.3 to 8.0mm, a width of 900 to 2000mm, and a surface roughness of 0.7 μm or less.
5. The production method according to claim 1, wherein the stainless steel cold-rolled strip has a surface roughness of 0.2 μm or less.
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| CN113234898A (en) * | 2021-05-19 | 2021-08-10 | 山西太钢不锈钢股份有限公司 | Continuous line annealing and pickling production method for wide iron-chromium-aluminum cold-rolled coil |
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| CN113234898A (en) * | 2021-05-19 | 2021-08-10 | 山西太钢不锈钢股份有限公司 | Continuous line annealing and pickling production method for wide iron-chromium-aluminum cold-rolled coil |
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