CN115558935A - Annealing and pickling method for hot-rolled austenitic stainless steel strip steel after surface overburning - Google Patents
Annealing and pickling method for hot-rolled austenitic stainless steel strip steel after surface overburning Download PDFInfo
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- CN115558935A CN115558935A CN202211270439.7A CN202211270439A CN115558935A CN 115558935 A CN115558935 A CN 115558935A CN 202211270439 A CN202211270439 A CN 202211270439A CN 115558935 A CN115558935 A CN 115558935A
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- 238000005554 pickling Methods 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000000137 annealing Methods 0.000 title claims abstract description 24
- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 title abstract description 35
- 239000010959 steel Substances 0.000 title abstract description 35
- 239000002253 acid Substances 0.000 claims abstract description 23
- 238000005422 blasting Methods 0.000 claims abstract description 15
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 30
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 13
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 10
- -1 iron ions Chemical class 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 229910017604 nitric acid Inorganic materials 0.000 claims description 10
- 239000000126 substance Substances 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 9
- 239000010935 stainless steel Substances 0.000 abstract description 9
- 238000010924 continuous production Methods 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 description 18
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 150000004965 peroxy acids Chemical class 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
-
- 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
- C23G1/081—Iron or steel solutions containing H2SO4
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/08—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for polishing surfaces, e.g. smoothing a surface by making use of liquid-borne abrasives
- B24C1/086—Descaling; Removing coating films
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
-
- 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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- 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)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention relates to the field of annealing and pickling of hot-rolled stainless steel strip steel. An annealing and pickling method for a hot-rolled austenitic stainless steel strip after steel surface overburning comprises the following steps: the method comprises the following steps: controlling the furnace temperature: the furnace temperature is controlled at 700-1000 ℃ and can be seriously secondarily oxidized when being higher than 1000 ℃; step two: the mechanical descaling capacity is increased during the acid cleaning rescue again, the current and the rotating speed of the shot blasting machine are increased, the rotating speed of the shot blasting machine is controlled to be 1900-2100 rpm, and the current is controlled to be 95-120A; step three: and (4) chemically descaling. The implementation of the invention can save the annealing and pickling method after the surface of the hot-rolled austenitic stainless steel strip is over-sintered, and the produced stainless steel surface can meet the requirements of customers. And special shutdown for cooling is not needed, so that the original production plan is not influenced, and continuous production operation can be realized.
Description
Technical Field
The invention relates to the field of annealing and pickling of hot-rolled stainless steel strip steel. In particular to an annealing and pickling method after the surface of hot-rolled austenitic stainless steel strip steel is over-sintered.
Background
After a stainless steel billet or a continuous casting billet is rolled to a target thickness through hot (continuous) rolling, work hardening can be generated in the process, and a layer of compact iron oxide scale can be formed on the surface of a steel plate. After the hot-rolled stainless steel strip is produced by the annealing and pickling production line, the work hardening is eliminated, and the iron scale on the surface of the strip is removed completely. The stainless steel strip steel treated by the annealing and pickling production line is generally produced continuously on line, and the main process flow comprises the following steps: the method comprises the steps of solution heat treatment of an online continuous annealing furnace, mechanical descaling of a descaling machine and a shot blasting machine, and chemical descaling and acid pickling of sulfuric acid and mixed acid (nitric acid and hydrofluoric acid).
When the strip steel is continuously produced by the annealing and pickling production line, the production line is decelerated and stopped due to unit faults or other reasons, and the surface of the strip steel in the continuous annealing furnace is locally blackened, namely, an overburning phenomenon is generated, so that the surface of the strip steel is unqualified. And the steel strip with over-burnt surface is produced and needs to be re-brought on line for acid pickling and saving. Conventionally, when the re-pickling is carried out, secondary oxidation is generated on the surface of the steel strip under the condition of high furnace temperature, so that the overburning defect is not easy to remove, and therefore, the re-pickling is usually carried out by adopting a method of raising the acid concentration without furnace temperature. In the actual production process, however, the method of raising the acid concentration without furnace temperature cannot rapidly remove the overburning defects on the surface of the steel strip, and needs to repeat the online pickling for many times to remove the overburning defects on the surface, and the secondary defects such as acid spots, scratches and the like are generated on the surface of the steel strip in the repeated online pickling for many times, which may finally result in the steel strip being rejected.
The invention provides an annealing and pickling method after the surface of hot-rolled austenitic stainless steel strip steel is overburnt, which can remove the overburning defect of the surface at one time and can not generate other secondary defects such as acid marks and the like when being used for carrying out pickling and rescue again.
Disclosure of Invention
The present invention has been made in view of the above problems, and an object of the present invention is to provide a method for annealing and pickling a surface of a hot-rolled austenitic stainless steel strip after overburning.
The purpose of the invention is realized by the following steps: the annealing and pickling method for the hot-rolled austenitic stainless steel strip after the surface is over-sintered comprises the following steps: the method comprises the following steps: controlling the furnace temperature: the furnace temperature is controlled at 700-1000 ℃ and can be seriously secondarily oxidized when being higher than 1000 ℃; step two: the mechanical descaling capacity is increased during the acid cleaning rescue again, the current and the rotating speed of the shot blasting machine are increased, the rotating speed of the shot blasting machine is controlled to be 1900-2100 rpm, and the current is controlled to be 95-120A; step three: and (4) chemically descaling.
In the chemical descaling process, the concentration of sulfuric acid is controlled to be 150-180g/l, the concentration of iron ions in sulfuric acid liquid is 0-60g/l, and the pickling time is 10-50s; the concentration of nitric acid is controlled to be 150-180g/l, the concentration of hydrofluoric acid is controlled to be 15-20g/l, the concentration of iron ions in the acid liquid is 0-60g/l, and the pickling time is 90-200s.
The invention has the beneficial effects that: the implementation of the invention can save the annealing and pickling method after the surface of the hot-rolled austenitic stainless steel strip is over-sintered, and the produced stainless steel surface can meet the requirements of customers. And special shutdown for cooling is not needed, so that the original production plan is not influenced, and continuous production operation can be realized.
Detailed Description
The annealing and pickling process of the hot-rolled austenitic stainless steel strip steel is generally on-line continuous production, and the main process flow comprises the following steps: the method comprises the steps of solution heat treatment of an online continuous annealing furnace, mechanical descaling of a descaling machine and a shot blasting machine, and chemical descaling and pickling of sulfuric acid and mixed acid (nitric acid and hydrofluoric acid).
When the hot-rolled austenitic stainless steel strip is produced by an annealing and pickling production line, the production line is decelerated and stopped due to unit faults or other reasons, the surface of the steel strip in a furnace is locally blackened, namely, an overburning phenomenon is generated, the surface of the steel strip is unqualified, and the steel strip needs to be put on line for pickling and saving again. The annealing and pickling method after the surface of the hot-rolled austenitic stainless steel strip is over-sintered is generally to select the pickling process of the original pickling process without furnace temperature or the pickling process of the original pickling process of Wen Yuan in a furnace. The first treatment method has the disadvantages that the overburning defect of the surface of the steel strip cannot be completely eliminated at one time, and particularly, when the overburning is serious, repeated pickling is needed; the second treatment method has the defects that the furnace temperature is too high, so that serious secondary oxidation is easily generated, the over-burning defect on the surface is more difficult to remove, and the steel strip can generate other irreparable defects after being treated for many times to judge the waste. The traditional non-furnace temperature pickling process has the defects that the defects of overburning on the surface of a steel strip cannot be completely eliminated once because the furnace temperature is not available, and particularly, the steel strip needs to be pickled again for many times when the overburning is serious; the disadvantage of the prior annealing and pickling process is that the furnace temperature is too high, so that serious secondary oxidation is easily generated, the surface over-burning defect is more difficult to remove, and the steel strip generates other irreparable defects after being treated for many times so as to judge the waste. The invention provides an annealing and pickling method for the surface of hot-rolled austenitic stainless steel strip after overburning, which starts with furnace temperature control, shot blasting process and pickling process control, so that the overburnt steel strip is qualified for one-time rescue when being subjected to pickling again for rescue. And special shutdown for cooling is not needed, so that the original production plan is not influenced, and continuous production operation can be realized.
1. Controlling the furnace temperature: the furnace temperature is required to be kept, serious secondary oxidation can occur when the furnace temperature is higher than 1000 ℃, and the furnace temperature is required to be controlled to be 700-1000 ℃.
2. And when the acid cleaning is carried out again for rescue, the mechanical descaling capability is improved, and the current and the rotating speed of the shot blasting machine are improved, wherein the rotating speed of the shot blasting machine is controlled to be 1900-2100 rpm, and the current is 95-120A.
3. In the chemical descaling process, the concentration of sulfuric acid is reduced and the concentration of nitric acid is increased, the concentration of sulfuric acid is controlled to be 150-180g/l, the concentration of iron ions in sulfuric acid liquid is 0-60g/l, and the pickling time is less than 50s; the concentration of nitric acid is controlled to be 150-180g/l, the concentration of hydrofluoric acid is controlled to be 15-20g/l, the concentration of iron ions in the acid liquid is 0-60g/l, and the pickling time is more than 90s.
The present invention will be further described with reference to the following examples. The following examples are illustrative of the present invention and the present invention is not limited to the following examples.
Example one
The embodiment provides an acid cleaning method for saving over-burnt 304 hot rolled stainless steel strip steel, wherein the thickness of the strip steel to be treated is 5.0 mm; the method comprises the following steps:
1. the furnace temperature was controlled at 850 ℃.
2. The current and the rotating speed of the shot blasting machine are improved on the basis of the original process, the rotating speed of the shot blasting machine 1950 r/min, and the current is 95A.
3. In the chemical descaling process, the concentration of sulfuric acid is reduced and the concentration of nitric acid is increased on the basis of an ortho-acid washing process, the concentration of sulfuric acid is 160g/l, the concentration of iron ions in sulfuric acid liquid is 35g/l, and the pickling time is 30s; the concentration of nitric acid is 165g/l, the concentration of hydrofluoric acid is 18g/l, the concentration of iron ions in the acid liquid is 25g/l, and the pickling time is 97s.
The iron scale which is difficult to remove at the over-burnt blackening defect is cleaned, the surface of the steel strip presents metal color, the surface of the steel strip does not have peracid defects such as acid marks and the like, and the surface color is uniform.
Example two
The embodiment provides an acid cleaning method for saving over-burnt 316L hot rolled stainless steel hot rolled strip steel, wherein the thickness of the strip steel to be treated is 6.0 mm; the method comprises the following steps:
1. the furnace temperature was controlled at 950 ℃.
2. The current and the rotating speed of the shot blasting machine are improved on the basis of the original process, the rotating speed of the shot blasting machine is 2000 rpm, and the current is 100A.
3. In the chemical descaling process, the concentration of sulfuric acid is reduced and the concentration of nitric acid is increased on the basis of an ortho-acid washing process, wherein the concentration of sulfuric acid is 155g/l, the concentration of iron ions in sulfuric acid liquid is 40g/l, and the pickling time is 40s; the concentration of nitric acid is more than 165g/l, the concentration of hydrofluoric acid is controlled to be 18g/l, the concentration of iron ions in the acid liquid is 25g/l, and the pickling time is 125s.
The iron scale which is difficult to remove at the over-burnt blackening defect is cleaned, the surface of the steel strip presents metal color, the surface of the steel strip does not have peracid defects such as acid marks and the like, and the surface color is uniform.
The above description is only an embodiment of the present invention, but the structural features of the present invention are not limited thereto, and any changes or modifications within the scope of the present invention by those skilled in the art are covered by the present invention.
Claims (2)
1. The annealing and pickling method after the surface of the hot-rolled austenitic stainless steel strip is overburnt is characterized by comprising the following steps of: the method comprises the following steps:
the method comprises the following steps: controlling the furnace temperature: the furnace temperature is controlled at 700-1000 ℃ and can be seriously secondarily oxidized when being higher than 1000 ℃;
step two: the mechanical descaling capacity is increased during the acid cleaning rescue again, the current and the rotating speed of the shot blasting machine are increased, the rotating speed of the shot blasting machine is controlled to be 1900-2100 rpm, and the current is controlled to be 95-120A;
step three: and (4) chemically descaling.
2. The method for annealing and pickling after the surface overburning of a hot-rolled austenitic stainless steel strip according to claim 1, wherein: in the chemical descaling process, the concentration of sulfuric acid is controlled to be 150-180g/l, the concentration of iron ions in sulfuric acid liquid is 0-60g/l, and the pickling time is 10-50s; the concentration of nitric acid is controlled to be 150-180g/l, the concentration of hydrofluoric acid is controlled to be 15-20g/l, the concentration of iron ions in the acid liquid is 0-60g/l, and the pickling time is 90-200s.
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|---|---|---|---|
| CN202211270439.7A CN115558935B (en) | 2022-10-18 | 2022-10-18 | Annealing and pickling method for surface overburning of hot rolled austenitic stainless steel strip steel |
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| CN202211270439.7A CN115558935B (en) | 2022-10-18 | 2022-10-18 | Annealing and pickling method for surface overburning of hot rolled austenitic stainless steel strip steel |
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| CN115558935B CN115558935B (en) | 2024-05-03 |
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2022
- 2022-10-18 CN CN202211270439.7A patent/CN115558935B/en active Active
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| KR101696103B1 (en) * | 2015-11-11 | 2017-01-13 | 주식회사 포스코 | Method for heat-treatment and removing scale of austenitic stainless steel |
| CN109321836A (en) * | 2018-12-06 | 2019-02-12 | 江苏合众不锈钢有限公司 | A kind of section nickel novel low-carbon austenic stainless steel belt and preparation method thereof |
| CN109628708A (en) * | 2018-12-29 | 2019-04-16 | 佛山市诚德新材料有限公司 | A kind of stainless steel band annealing and pickling method of environmental protection and energy saving |
| CN112501422A (en) * | 2020-11-27 | 2021-03-16 | 山西太钢不锈钢股份有限公司 | Surface treatment method for 304 series high-grade panel stainless steel raw material |
| CN113477708A (en) * | 2021-06-17 | 2021-10-08 | 天津太钢天管不锈钢有限公司 | Manufacturing method of austenitic stainless steel suitable for surface embossing |
| CN114058797A (en) * | 2021-11-18 | 2022-02-18 | 山西太钢不锈钢股份有限公司 | Continuous line annealing and pickling production method of nickel-saving austenitic stainless steel |
| CN114733910A (en) * | 2022-03-31 | 2022-07-12 | 天津太钢天管不锈钢有限公司 | Manufacturing method of austenitic stainless steel suitable for surface sand blasting processing |
| CN115110084A (en) * | 2022-06-15 | 2022-09-27 | 山西太钢不锈钢股份有限公司 | Pickling method of duplex stainless steel cold-rolled strip steel |
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