CN114833197A - 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
- Publication number
- CN114833197A CN114833197A CN202210420913.3A CN202210420913A CN114833197A CN 114833197 A CN114833197 A CN 114833197A CN 202210420913 A CN202210420913 A CN 202210420913A CN 114833197 A CN114833197 A CN 114833197A
- Authority
- CN
- China
- Prior art keywords
- cold
- rolled
- rolling
- steel
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 65
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 64
- 239000010935 stainless steel Substances 0.000 title claims abstract description 63
- 239000010960 cold rolled steel Substances 0.000 title claims abstract description 42
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 98
- 239000010959 steel Substances 0.000 claims abstract description 98
- 238000000137 annealing Methods 0.000 claims abstract description 69
- 238000003466 welding Methods 0.000 claims abstract description 66
- 238000005096 rolling process Methods 0.000 claims abstract description 52
- 239000002253 acid Substances 0.000 claims abstract description 39
- 238000005097 cold rolling Methods 0.000 claims abstract description 28
- 238000011282 treatment Methods 0.000 claims abstract description 27
- 238000005098 hot rolling Methods 0.000 claims abstract description 14
- 238000005238 degreasing Methods 0.000 claims abstract description 11
- 238000005406 washing Methods 0.000 claims abstract description 8
- 238000004140 cleaning 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
- 238000005554 pickling Methods 0.000 claims description 36
- 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
- 239000000463 material Substances 0.000 claims description 20
- 230000003746 surface roughness Effects 0.000 claims description 19
- 238000004321 preservation Methods 0.000 claims description 10
- 238000000227 grinding Methods 0.000 claims description 8
- 238000005265 energy consumption Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 30
- 230000008569 process Effects 0.000 description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 238000001816 cooling Methods 0.000 description 10
- 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
- 239000011651 chromium Substances 0.000 description 6
- 229910052804 chromium Inorganic materials 0.000 description 5
- 238000005461 lubrication Methods 0.000 description 5
- 239000003921 oil Substances 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000002994 raw material Substances 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 229910052748 manganese Inorganic materials 0.000 description 4
- 239000003595 mist Substances 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 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
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000001680 brushing effect Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000011160 research Methods 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
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 241000316887 Saissetia oleae Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000002485 combustion reaction Methods 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
- 230000009977 dual effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009396 hybridization Methods 0.000 description 1
- 239000011261 inert gas 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
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Metal Rolling (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 in the front and back, and then carrying out degreasing treatment; (3) the degreased steel coil enters an annealing furnace for 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 acid cleaning 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 steels are mainly characterized by stainless and corrosion resistance, and have a chromium content of at least 10.5% and a carbon content of not more than 1.2% at the maximum, and are classified into austenitic steels, ferritic steels, martensitic steels, austenitic-ferritic dual-phase steels, precipitation hardening stainless steels, and the like, in terms of structure state.
The conventional production flow of the stainless steel cold-rolled steel strip comprises the following steps: the hot-rolled black skin material is annealed and pickled → cold rolling annealed and pickled → flattening, which is also the production flow of most of the conventional stainless steel cold-rolled strips, and the production equipment of the stainless steel production plant is basically matched with the conventional process. However, this production process has disadvantages of high production cost and long production time.
On the other hand, the production of stainless steel strip is an energy consumption process, the annealing requires combustion of coal gas to ensure the annealing temperature, the treatment of pickling waste also requires a complex flow, the operation of production equipment also consumes a large amount of electric energy, and the like.
Therefore, the problem to be solved is to find a method for producing a stainless steel cold-rolled strip with low cost and low energy consumption.
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 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 in the front and back, and then carrying out degreasing treatment;
(3) the degreased steel coil enters an annealing furnace to be annealed at a low temperature;
(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 acid cleaning 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 passes, 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 rough grinding roller with the roughness of 0.8-1.2 mu m is used as a rolling working roller in the first rolling pass, and the flat roller with the roughness of 0.3-0.5 mu m is used as a rolling working roller in the other rolling passes.
Optionally, the thickness of the stainless steel cold-rolled steel strip is 0.3-2.5 mm, and the cold-rolled steel strips adjacent to each other in the front and back are welded by roller resistance welding in the step (2), wherein the overlapping amount of the cold-rolled steel strips adjacent to each other in the 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), MIG welding is adopted to butt-joint the cold-rolled steel strips adjacent to each other in front and back for welding, wherein the gap between the cold-rolled steel strips adjacent to each other in front and back 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 ℃ 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.
Optionally, in the step (4), acid cleaning is performed by using a 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 4000-6000A, 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 the step (5), the roughness of the leveling roller of the leveling machine is 0.04-0.2 μm, the leveling pressure is 150-900 tons, and the elongation is 0.2-2.0%.
Optionally, the stainless steel cold rolled steel strip is a stainless steel with a designation 201, 304, 316, 410, 430, 409, 443 or Cr 13.
Optionally, the stainless steel cold-rolled steel 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, the stainless steel cold-rolled steel strip produced by the process adopts hot-rolled black skin materials to carry out cold rolling directly, the hot-rolling 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 stainless steel cold-rolled steel strip produced by the process has the thickness precision control level consistent with that of the stainless steel cold-rolled steel strip obtained by the conventional process, and the thickness fluctuation of the whole roll can be controlled within +/-5 mu m.
(3) The stainless steel cold-rolled strip produced by the process has qualified surface pickling and no iron scale residue, has the surface roughness Ra of 0.2-0.7 mu m (the roughness Ra can reach below 0.2 mu m after multiple flattening), and has the same roughness as the stainless steel cold-rolled strip obtained by the conventional process.
(4) The unevenness of the stainless steel cold-rolled steel strip produced by the process can reach within 6mm/m, and is consistent with the stainless steel cold-rolled steel strip obtained by the conventional process.
(5) The mechanical property of the stainless steel cold-rolled strip produced by the process meets the requirements of the standards of GB/T3280, JIS G4305, EN 10088 and the like.
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 stainless steel cold-rolled strip produced in example 1 of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to fully understand the objects, features and effects of the invention. The process of the present invention employs conventional methods or apparatus in the art, except as described below. The following noun terms have meanings commonly understood by those skilled in the art unless otherwise specified.
Aiming at the problems of high cost, high energy consumption, low production efficiency, long production period and the like of the current stainless steel cold-rolled steel strip production process, the inventor of the invention carries out deep research on the process and finds that:
the production process of the conventional stainless steel cold-rolled strip comprises the steps of firstly carrying out hot rolling, annealing and pickling to clean oxide scale on the surface, wherein a key device for eliminating the oxide scale in the hot rolling, annealing and pickling process is a scale breaker, and the working principle of the scale breaker is that the steel strip is stretched by 0.3-3% of elongation percentage to deform, so that the oxide scale is separated from a steel strip substrate, and the purpose of removing phosphorus is achieved. The cold rolling mill reduces the thickness of the steel strip through the dual functions of tension and pressure, and if the hot-rolled black skin material is directly subjected to cold rolling and matched with specific cold rolling process conditions, the effect of scale breaking can also be achieved. On the other hand, although the oxide skin on the surface of the black skin material subjected to cold rolling falls off, a large amount of oxide skin remains, the oxide skin on the surface is further increased after annealing, the black skin material cannot be cleaned by pickling with a conventional pickling process, and the surface roughness is also high, so that the annealing process, the pickling medium, the process and the leveling process need to be further adjusted.
Based on the 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 in the front and back, and then carrying out degreasing treatment; (3) the degreased steel coil enters an annealing furnace for 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 acid cleaning 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 and the like, and obtain the cold-rolled steel strip with the thickness range of 0.3-8.0 mm and the width range of 900-2000 mm, the surface roughness of the finished product is similar to that of the conventional process material, and the mechanical property meets the requirement of GB/T3280 standard.
As a preferred embodiment, the method for producing a cold-rolled stainless steel strip according to the invention comprises the following steps:
(1) and (3) directly cold rolling the stainless steel hot-rolled black strip coil in the non-annealed state.
In the present invention, the black strip coil or black strip is named after the surface of a coil obtained by hot rolling has a black scale layer before annealing, pickling, or the like.
In the present invention, the hot rolling process can refer to the related schemes in the prior art, and in the actual production, a person skilled in the art can select a suitable hot rolling process as required, which is not described herein.
In this step, the hot-rolled non-annealed stainless steel hot-rolled black coil was conveyed to a twenty-high cold rolling mill (for example, a sendzimir twenty-high cold rolling mill) and rolled. The head and the tail of the hot-rolled black skin coil are in a fish head shape, so that the black skin coil cannot be directly coiled on a winding drum after being threaded on a rolling mill, and a wrapper needs to be adopted for coiling.
The rolling process adopts oil lubrication, the deformation rate of the rolling thickness is 50-80%, the rolling pass is 5-15, and the deformation rate of the single pass is 5-25%. The working roll of the cold rolling mill adopts the following settings: the rough grinding roller with the roughness of 0.8-1.2 mu m is used as a rolling working roller in the first rolling pass, and the flat roller with the roughness of 0.3-0.5 mu m is used as a rolling working roller in the other rolling passes.
The conventional stainless steel cold-rolled plate is characterized in that the black skin roll is firstly annealed and pickled and then cold-rolled, but in the invention, the stainless steel black skin roll is directly cold-rolled without being annealed and pickled, so that a novel cold-rolled steel strip production process route is developed, the whole hot-rolling annealing and pickling process in the production process of the conventional stainless steel cold-rolled plate is reduced, and the key of reducing the cost is realized.
(2) Welding and degreasing the cold-rolled steel coil.
Open the back with the coil of strip on the decoiler, cut clean head and the tail part of not rolling, carry out on-line welding with adjacent coil of strip around, according to the thickness of material, the welding mode divide into two kinds:
for a steel strip with the thickness of 0.3mm or more and 0.8mm or less, roller resistance welding is adopted, the front steel strip and the rear steel strip are in lap joint, oxide skin at a welding seam is required to be polished completely by a grinding machine before welding, the lap joint quantity of the welding seam is 1-3 mm, the welding speed is 5-11 m/min, and the welding current is 3000-25000A. For a 0.3-2.5 mm steel strip, roller resistance welding is adopted, but after the hot-rolled black sheet material is subjected to cold rolling, the surface still has a layer of oxide skin, and direct welding cannot be realized through resistance welding, so that the oxide skin at a welding seam is required to be polished by a special polishing machine, and one-time welding success can be realized after polishing.
For a steel strip with the thickness of 2.5mm or more and the thickness of 8.0mm or less, MIG (metal inert gas) welding is adopted, the front steel strip and the rear steel strip are butted, the gap is 0-2 mm, the welding speed is 0.8-1.5 m/min, the voltage is 27-31V, ER309L with the diameter of 1.2mm is adopted as a welding wire, and the wire feeding speed is 8-14 m/min.
The two welding methods are suitable for steel strips with the thickness of more than 0.8mm and less than 2.5 mm.
Degreasing the welded steel strip, and then entering an annealing and pickling production line. The degreasing treatment can be performed according to the scheme in the prior art, and is not described herein.
(3) And (5) low-temperature annealing treatment.
And (4) the degreased steel strip enters an annealing furnace for low-temperature annealing treatment.
In order to reduce the formation of oxide skin on the surface of the steel strip at high temperature and reduce the annealing temperature as much as possible on the premise of ensuring the qualified mechanical property. Compared with the white-skin coil obtained by the conventional process (namely the steel coil obtained by annealing, pickling, cold rolling and other treatments on the hot rolled steel coil), the annealing temperature adopted by the method is reduced by 10-80 ℃ compared with the annealing temperature of the white-skin coil, and the heat preservation time in an annealing furnace is 1.0-3.0 min/mm. For example, when the grade of the stainless steel is 410 or 430, the annealing temperature is 800-860 ℃; when the grade of the stainless steel is 304, the annealing temperature is 1030-1130 ℃; when the grade of the stainless steel is 409, the annealing temperature is 870-935 ℃; when the grade of the stainless steel is 443, the annealing temperature is 910-980 ℃.
After the high-temperature heat preservation is finished, the steel strip is rapidly cooled by adopting fog cooling and air cooling, and is output from the annealing furnace after being cooled to below 120 ℃.
In the step, the annealing temperature lower than that of the conventional white-skinned roll is generally adopted, but the production speed is not lower than that of the conventional white-skinned roll, so that the generation of oxide skin in the annealing process can be effectively reduced.
(4) And (5) acid pickling treatment.
And pickling the annealed steel coil by adopting a mixed acid of electrolytic sodium sulfate, electrolytic nitric acid, nitric acid and hydrofluoric acid, wherein specific parameters can be selected according to the grade of stainless steel.
For example, when the stainless steel is 410 or 430, 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 ℃. When the stainless steel grade is 304, the concentration of sodium sulfate in 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 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 a 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 ℃.
Brush rolls made of silicon carbide materials are respectively adopted at an outlet of the electrolytic sodium sulfate tank, an outlet of the electrolytic nitric acid tank and an outlet of the mixed acid tank to brush the surface of the steel strip.
The brush roller made of silicon carbide is adopted to brush the surface of the steel belt at the same time by adopting specific concentration and temperature, so that the steel belt can be cleaned by acid washing without iron scale residue.
(5) And (4) leveling on line.
Carrying out high-pressure online leveling on the annealed and pickled steel coil in a cold rolling and pickling line to improve the surface roughness and the plate shape of the steel coil, leveling by adopting a 2-roller leveling machine, wherein the roughness of a 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 hybridization.
In order to improve the surface roughness and the plate shape of the annealed steel strip, the step adopts large-pressure flattening, the plate shape is flat and straight, the surface roughness is Ra0.2-0.7 mu m, and the roughness Ra can reach below 0.2 mu m after multiple flattening.
The invention is mainly based on the following findings or research results of the inventor:
the rough grinding roller is adopted for the first time, so that the surface roughness of the rough grinding roller is relatively high, and oxide skin on the surface of a steel strip can be damaged to a certain degree, so that the effect of falling of the oxide skin in the rolling process is improved.
And flat rolls with the roughness of Ra0.3-0.5 mu m are adopted in other passes, and the surface roughness of the rolled product is mainly ensured not to be too high.
The total rolling deformation rate is about 10% lower than that of the conventional material, mainly considering that the annealing temperature is lower than that of the conventional material in order to reduce the generation of surface oxide skin during the next annealing, and the proper reduction of the deformation rate can ensure the recovery of the structure after the annealing.
The roughness of the leveling roller is smaller than that of the conventional 2B material; the flattening pressure and the elongation are higher than those of the conventional 2B material, and the flattening pressure and the elongation are mainly used for reducing the surface roughness of a finished product and improving the brightness and the surface quality.
Examples
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention. Experimental procedures without specifying specific conditions in the following examples were selected in accordance with conventional procedures and conditions, or in accordance with commercial instructions.
Example 1:
the non-annealed 06Cr13 black skin hot-rolled coil with the thickness of 4.0mm and the width of 1258mm is taken as a raw material, and the chemical components of the hot-rolled coil are as follows by mass percent: c: 0.0334%, Cr: 13.3306%, Si: 0.7168%, Mn: 0.3544%, Ni: 0.1109%, P: 0.0317%, S: 0.001%, N: 0.0151 percent, and the balance of Fe and other inevitable impurities.
The production method comprises the following steps:
(1) the 06Cr13 black skin steel coil in the non-annealed state is hot-rolled, and is directly cold-rolled on a Sendzimir twenty-high roll mill, and because the head and the tail of the hot-rolled black skin steel coil are in a fish head shape, the hot-rolled black skin steel coil cannot be directly coiled on a winding drum after being threaded on the mill, and a wrapper needs to be adopted for coiling; the rolling process adopts oil lubrication, the rolling thickness deformation rate is 50 percent, namely the thickness after rolling is 2.0mm, the rolling is carried out for 7 times in total, the single-pass deformation rate is 8-18 percent, 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 for the first pass of a rolling working roller, flat rollers with the roughness Ra of 0.3-0.5 mu m are adopted for the other passes (specifically, 4 flat rollers are adopted in the embodiment, the roughness Ra is 0.366 mu m, 0.372 mu m, 0.375 mu m and 0.366 mu m respectively), and other rolling parameters are the same as that of a rolling annealed 06Cr13 acid-washed white coil.
(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 parts of the head and the tail which are not rolled are cut off completely, the front and the rear steel coils are welded on line, the welding mode is roller resistance lap welding, oxide skin at a welding seam is required to be polished completely by a special polisher before welding, the lap joint quantity of the welding seam is 2mm, the welding speed is 7.8m/min, and the welding current is 16000A.
(3) And (4) after degreasing, annealing in an annealing furnace, and reducing the annealing temperature as much as possible on the premise of ensuring the qualified mechanical property in order to reduce the formation of oxide skin on the surface of the steel strip at high temperature. The furnace temperature is controlled at 815 ℃, and the holding time in the furnace is 1.8 min/mm; after the high-temperature heat preservation is finished, the steel strip is rapidly cooled by mist cooling and air cooling, and the steel strip is discharged after being cooled to below 120 ℃.
(4) Pickling the annealed steel coil, and pickling by adopting mixed acid of electrolytic sodium sulfate, electrolytic nitric acid, nitric acid and hydrofluoric acid, 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 ℃. Brush rolls made of silicon carbide materials are respectively adopted at an outlet of the electrolytic sodium sulfate tank, an outlet of the electrolytic nitric acid tank and an outlet of the mixed acid tank to brush the surface of the steel strip.
(5) And (3) flattening the annealed and acid-washed steel coil under high pressure to improve the surface roughness and the plate shape of the steel strip, wherein a 2-roller flattening machine is adopted for flattening, the roughness of a flattening roller is Ra0.05 mu m, the flattening pressure is 650 tons, and the elongation is 0.8%.
(6) And cutting the flattened steel coil on a slitting machine set to clean the parts with defects at the head and the tail, and packaging to obtain the finished product.
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 iron scale remains.
The surface roughness of the finished product of the embodiment is Ra 0.5-0.6 μm, the elongation A50 is 32%, the yield strength Rp0.2 is 275MPa, the tensile strength Rm is 502MPa, and the mechanical property meets the requirement of GB/T3280.
Comparative example 1
Comparative example 1 the overall process is similar to example 1, except that:
the non-annealed 06Cr13 black skin hot-rolled coil with the thickness of 5.0mm and the width of 1260mm is taken as a raw material, and the chemical components by mass percent are as follows: c: 0.0289%, Cr: 13.1511%, Si: 0.7889%, Mn: 0.3445%, Ni: 0.1368%, P: 0.0126%, S: 0.0016%, N: 0.0297%, and the balance of Fe and other unavoidable impurities.
The process is as follows:
(1) annealing and pickling the 06Cr13 black steel coil:
the 06Cr13 black strip steel coil in the unannealed state is hot-rolled, the annealing and pickling are carried out on a hot-rolling annealing and pickling production line, the front and the rear steel strips are welded by MIG welding, the length of an annealing furnace is 80m, the furnace temperature is controlled according to 850 ℃, the production speed is 40m/min, the pickling adopts sulfuric acid and mixed acid (nitric acid and hydrofluoric acid), wherein the sulfuric acid concentration is 231g/L, the temperature is 80 ℃, the nitric acid concentration is 82g/L, the hydrofluoric acid concentration is 2.1g/L, and the mixed acid temperature is 25 ℃.
(2) After annealing and acid washing, cold rolling is carried out on a Sendzimir twenty-high roll mill, oil lubrication is adopted in the rolling process, the deformation rate of the rolling thickness is 60 percent, namely the thickness after rolling is 2.0mm, flat rolls with the roughness Ra of 0.3-0.5 mu m are adopted in the rolling process, 6 flat rolls are used in 9 passes of the rolling, and the roughness Ra of 0.355/0.363/0.366/0.372/0.354/0.371 mu m are 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 head and the tail of the steel coil are cut clean, the front and the rear steel coils are welded on line, the welding mode is roller resistance lap welding and direct welding, the lap joint quantity of a welding line is 2mm, the welding speed is 8.0m/min, and the welding current is 16000A.
(4) And (5) annealing in an annealing furnace after degreasing. The furnace temperature is controlled to be 860 ℃, and the heat preservation time in the furnace is 1.8 min/mm; after the high-temperature heat preservation is finished, the steel strip is rapidly cooled by mist cooling and air cooling, and the steel strip is discharged after being cooled to below 120 ℃.
(5) Pickling the annealed steel coil, and pickling by adopting mixed acid of electrolytic sodium sulfate, electrolytic nitric acid, nitric acid and hydrofluoric 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 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 ℃. And brushing the surfaces of the steel strips 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 acid mixing tank respectively.
(6) And (3) flattening the annealed and pickled steel coil by adopting a 2-roller flattening machine, wherein the roughness of a flattening roller is Ra0.05 mu m, the flattening pressure is 450 tons, and the elongation is 0.4%.
(7) And cutting the flattened steel coil on a slitting machine set to clean the parts with defects at the head and the tail, and packaging to obtain the finished product.
The surface roughness of the finished product is Ra 0.49-0.55 μm, the elongation A50 29%, the yield strength Rp0.2 301MPa, and the tensile strength Rm 524MPa
Comparing example 1 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 method is characterized in that an 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 raw material comprises the following chemical components in percentage by mass: 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 an unannealed SUS430 black skin steel coil, and directly cold-rolling the SUS430 black skin steel coil on a Sendzimir twenty-high roll mill, wherein the head and the tail of the hot-rolled black skin steel coil are in a fish head shape, so that the hot-rolled black skin steel coil cannot be directly coiled on a winding drum after being threaded on the roll mill, and a wrapper needs to be adopted for coiling; the rolling process adopts oil lubrication, the rolling thickness deformation rate is 60 percent, namely the thickness after rolling is 1.2mm, the rolling is carried out for 7 passes in total, the single-pass deformation rate is 10-22 percent, two rough grinding rollers with the roughness Ra of 1.03 mu m and 1.022 mu m are adopted for the first pass of the rolling working roller, flat rollers with the roughness Ra0.3-0.5 mu m are adopted for the other passes (specifically, 4 flat rollers are adopted in the embodiment, the roughness Ra is 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 acid-washed white skin roll in the conventional annealing state.
(2) The rolled SUS430 steel coil is annealed and pickled in a cold rolling annealing and pickling line. Open the back with the coil of strip on decoiler, cut clean head and the tail part of not rolling, carry out on-line welding with fore-and-after coil of strip, welding mode is gyro wheel resistance overlap welding, needs adopt dedicated polisher to polish totally with the cinder of welding seam department before the welding, welding seam overlap joint volume 2.0mm, welding speed 7.8m/min, welding current 15000A.
(3) And after degreasing, annealing in an annealing furnace, and reducing the annealing temperature as much as possible on the premise of ensuring the qualified mechanical property for reducing the formation of oxide skin on the surface of the steel strip at high temperature. The furnace temperature is controlled to be 825 ℃, and the heat preservation time in the furnace is 1.3 min/mm; after the high-temperature heat preservation is finished, the steel strip is rapidly cooled by mist cooling and air cooling, and the steel strip is discharged after being cooled to below 120 ℃.
(4) Pickling the annealed steel coil, and pickling by adopting mixed acid of electrolytic sodium sulfate, electrolytic nitric acid, nitric acid and hydrofluoric acid, 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 ℃. Brush rolls made of silicon carbide materials are respectively adopted at an outlet of the electrolytic sodium sulfate tank, an outlet of the electrolytic nitric acid tank and an outlet of the mixed acid tank to brush the surface of the steel strip.
(5) And (3) flattening the annealed and acid-washed steel coil under high pressure to improve the surface roughness and the plate shape of the steel strip, wherein a 2-roller flattening machine is adopted for flattening, the roughness of a flattening roller is Ra0.05 mu m, the flattening pressure is 650 tons, and the elongation is 0.8%.
(6) And cutting the flattened steel coil on a slitting machine set to clean the parts with defects at the head and the tail, and packaging to obtain the finished product.
The surface roughness Ra of the finished product of this example was 0.45 to 0.52 μm, the elongation a50 was 31.5%, the yield strength rp0.2 was 337MPa, the tensile strength Rm was 485MPa, and the mechanical properties satisfied 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 used as a raw material, and the chemical components of the annealed 430 black skin hot-rolled coil are as follows by mass percent: c: 0.0372%, Cr: 16.2660%, Si: 0.2792%, Mn: 0.3088%, Ni: 0.1357%, P: 0.0226%, S: 0.0032%, N: 0.0356%, the balance being Fe and other unavoidable impurities.
The process is as follows:
(1) pickling the 430 black steel coil:
the 430 black strip coil in the annealed state is hot-rolled and pickled on a hot-rolling annealing pickling production line, the front and rear steel strips are welded by MIG welding at the production speed of 38m/min, and the pickling is carried out by adopting sulfuric acid and mixed acid (nitric acid and hydrofluoric acid), wherein the sulfuric acid concentration is 262g/L, the temperature is 82 ℃, the nitric acid concentration is 107g/L, the hydrofluoric acid concentration is 4.3g/L, and the mixed acid temperature is 44 ℃.
(2) And (3) cold rolling the annealed and acid-washed twenty-high-speed steel on a Sendzimir-top rolling mill, wherein oil lubrication is adopted in the rolling process, the rolling thickness deformation rate is 70 percent, namely the thickness after rolling is 1.2mm, flat rolls with the roughness Ra of 0.3-0.5 mu m are adopted in the rolling process, 6 flat rolls are used in the 9 passes of the rolling, and the roughness is respectively Ra of 0.381/0.344/0.362/0.355/0.364/0.368 mu m.
(3) And (3) carrying out annealing and pickling operation on the rolled 430 steel coil on a cold rolling annealing and pickling production line. After the steel coil is opened on the uncoiler, the parts which are not rolled at the head and the tail are cut off, the front and the rear steel coils are welded on line, the welding mode is roller resistance lap welding and direct welding, the lap joint quantity of a welding line is 2mm, the welding speed is 8.0m/min, and the welding current is 15000A.
(4) And (5) annealing in an annealing furnace after degreasing. Controlling the furnace temperature to 860 ℃, and keeping the temperature in the furnace for 1 min/mm; after the high-temperature heat preservation is finished, the steel strip is rapidly cooled by mist cooling and air cooling, and the steel strip is discharged after being cooled to below 120 ℃.
(5) Carrying out acid washing on the annealed steel coil, and carrying out acid washing 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 ℃. And brushing the surfaces of the steel strips 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 acid mixing tank respectively.
(6) And (3) flattening the annealed and pickled steel coil by adopting a 2-roller flattening machine, wherein the roughness of a flattening roller is Ra0.05 mu m, the flattening pressure is 400 tons, and the elongation is 0.5%.
(7) And cutting the flattened steel coil on a slitting machine set to clean the parts with defects at the head and the tail, and packaging to obtain the finished product.
The surface roughness of the finished product of this comparative example was Ra 0.36 to 0.40. mu.m, elongation A50 28%, yield strength Rp0.2 280MPa, and tensile strength Rm 496MPa
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, the elongation, the yield strength, the tensile strength and the like of the product are similar to or better than those of comparative example 2.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other substitutions, modifications, combinations, changes, simplifications, etc., which are made without departing from the spirit and principle of the present invention, should be construed as equivalents and included in the protection scope of the present invention.
Claims (10)
1. The production method of the stainless steel cold-rolled strip is characterized by comprising 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 in the front and back, and then carrying out degreasing treatment;
(3) the degreased steel coil enters an annealing furnace for 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 acid cleaning treatment to a leveling machine for online leveling.
2. The production method according to claim 1, wherein in the step (1), the rolling thickness deformation rate is 50% to 80%, the rolling pass is 5 to 15 passes, and the single-pass deformation rate is 5 to 25%.
3. The production method according to claim 1, wherein in step (1), the cold rolling mill is a twenty-high cold rolling mill;
the rough grinding roller with the roughness of 0.8-1.2 mu m is used as a rolling working roller in the first rolling pass, and the flat roller with the roughness of 0.3-0.5 mu m is used as a rolling working roller in the other rolling passes.
4. The production method according to claim 1, wherein the thickness of the stainless steel cold-rolled steel strip is 0.3 to 2.5mm, and the cold-rolled steel strips adjacent to each other in the front and back are welded by roller resistance welding in the step (2), wherein the overlapping amount of the cold-rolled steel strips adjacent to each other in the front and back is 1 to 3mm, the welding speed is 5 to 11m/min, and the welding current is 3000 to 25000A.
5. The production method according to claim 1, wherein the thickness of the stainless steel cold-rolled steel strip is 0.8-8.0 mm, and the cold-rolled steel strips adjacent to each other in the front and back are welded by the MIG welding in the step (2), wherein the gap between the cold-rolled steel strips adjacent to each other in the front and back is not more than 2mm, the welding speed is 0.8-1.5 m/min, the voltage is 27-31V, the diameter of the welding wire is 1.2mm, and the wire feeding speed of the welding wire is 8-14 m/min.
6. The production method according to claim 1, wherein in the step (3), the temperature of the low-temperature annealing treatment is reduced by 10-80 ℃ on the basis of the annealing temperature of the stainless steel blank coil cold-rolled material, and the heat preservation time in the annealing furnace is 1.0-3.0 min/mm.
7. The production method according to claim 1, wherein in the step (4), pickling is performed with a 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 4000-6000A, 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 ℃.
8. The production method as claimed in claim 1, wherein in the step (5), the temper mill has a temper roll roughness of 0.04 to 0.2 μm, a temper pressure of 150 to 900 tons, and an elongation of 0.2 to 2.0%.
9. The production method according to claim 1, characterized in that the cold-rolled strip of stainless steel is a stainless steel with a designation 201, 304, 316, 410, 430, 409, 443 or Cr 13.
10. The production method according to claim 1, characterized in that 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 below 0.7 μm and preferably below 0.2 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210420913.3A CN114833197A (en) | 2022-04-21 | 2022-04-21 | Production method of low-cost stainless steel cold-rolled steel strip |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210420913.3A CN114833197A (en) | 2022-04-21 | 2022-04-21 | Production method of low-cost stainless steel cold-rolled steel strip |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114833197A true CN114833197A (en) | 2022-08-02 |
Family
ID=82565191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210420913.3A Pending CN114833197A (en) | 2022-04-21 | 2022-04-21 | Production method of low-cost stainless steel cold-rolled steel strip |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114833197A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10158784A (en) * | 1996-11-27 | 1998-06-16 | Kawasaki Steel Corp | High strength hot rolled steel sheet |
| CN203170699U (en) * | 2013-02-19 | 2013-09-04 | 中冶东方工程技术有限公司秦皇岛研究设计院 | Stainless steel black roll online rolling annealing pickling production line |
| CN103966409A (en) * | 2013-01-31 | 2014-08-06 | 宝钢不锈钢有限公司 | Manufacturing method for medium chrome ferrite stainless steel |
| 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 |
| CN113385537A (en) * | 2021-06-08 | 2021-09-14 | 山西太钢不锈钢股份有限公司 | Method for directly cold rolling stainless steel without annealing |
-
2022
- 2022-04-21 CN CN202210420913.3A patent/CN114833197A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10158784A (en) * | 1996-11-27 | 1998-06-16 | Kawasaki Steel Corp | High strength hot rolled steel sheet |
| CN103966409A (en) * | 2013-01-31 | 2014-08-06 | 宝钢不锈钢有限公司 | Manufacturing method for medium chrome ferrite stainless steel |
| CN203170699U (en) * | 2013-02-19 | 2013-09-04 | 中冶东方工程技术有限公司秦皇岛研究设计院 | Stainless steel black roll online rolling annealing pickling production line |
| 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 |
| CN113385537A (en) * | 2021-06-08 | 2021-09-14 | 山西太钢不锈钢股份有限公司 | Method for directly cold rolling stainless steel without annealing |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102416404B (en) | Method for producing cold-rolled steel strips | |
| CN100500914C (en) | Method for rolling thick specification low-alloy structure steel plate by using middle and thin plate blank | |
| EP0120976B1 (en) | Process for manufacturing cold-rolled steel for deep drawing | |
| CN109440007B (en) | Thin-gauge high-performance ultrahigh-strength semi-hard steel strip and production method thereof | |
| WO2022242514A1 (en) | Continuous line annealing and pickling production method for wide iron-chromium-aluminum cold-rolled coil | |
| CN111519082A (en) | Preparation method of ultrathin cold-rolled weather-resistant steel plate | |
| EP1637243A2 (en) | Method for manufacturing of stainless steel strips and rolling mill line | |
| CN113957336A (en) | Production method of low-cost high-toughness Q460qNHD steel plate | |
| JP3546605B2 (en) | Manufacturing method of steel sheet for cans | |
| CN112522576B (en) | Thin-gauge high-corrosion-resistance steel and production method thereof | |
| CN112126855A (en) | Production method of cold-rolled weather-resistant steel with yield strength of more than 310MPa | |
| CN112522641B (en) | High-strength thin-specification high-corrosion-resistance steel and manufacturing method thereof | |
| CN112077165B (en) | Rolling method of 50Mn thin high-carbon cold-rolled steel sheet | |
| CN112522573B (en) | B-containing martensite steel strip and manufacturing method thereof | |
| JPH034607B2 (en) | ||
| CN114833197A (en) | Production method of low-cost stainless steel cold-rolled steel strip | |
| CN110358976A (en) | A kind of high-carbon steel strip and its production method | |
| CN112522599A (en) | Hot-rolled steel plate/strip for resisting sulfuric acid dew point corrosion and manufacturing method thereof | |
| CN112522633B (en) | Thin-gauge martensitic steel strip and manufacturing method thereof | |
| CN113528765A (en) | Method for improving surface wrinkling defect of titanium-containing ferrite stainless steel | |
| JPH0860243A (en) | Production of ferritic stainless steel sheet for automobile exhaust system apparatus excellent in corrosion resistance | |
| CN112522585A (en) | Production method of thin hot rolled steel plate/strip for resisting sulfuric acid dew point corrosion | |
| JPH0557332B2 (en) | ||
| JPS5931829A (en) | Production of al killd high strength cold rolled steel sheet having excellent deep drawability | |
| CN109487279B (en) | Continuous pickling process for high-aluminum chilled steel strip |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |