CN113385537A - Method for directly cold rolling stainless steel without annealing - Google Patents

Method for directly cold rolling stainless steel without annealing Download PDF

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Publication number
CN113385537A
CN113385537A CN202110639562.0A CN202110639562A CN113385537A CN 113385537 A CN113385537 A CN 113385537A CN 202110639562 A CN202110639562 A CN 202110639562A CN 113385537 A CN113385537 A CN 113385537A
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China
Prior art keywords
rolling
annealing
stainless steel
cold rolling
cold
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Pending
Application number
CN202110639562.0A
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Chinese (zh)
Inventor
杨永超
白晋钢
杨东
赵子钧
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanxi Taigang Stainless Steel Co Ltd
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Shanxi Taigang Stainless Steel Co Ltd
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Publication date
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Priority to CN202110639562.0A priority Critical patent/CN113385537A/en
Publication of CN113385537A publication Critical patent/CN113385537A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02—Rolling special iron alloys, e.g. stainless steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/56—Elongation control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/26—Methods of annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0236—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel

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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)
  • Heat Treatment Of Sheet Steel (AREA)

Abstract

The invention belongs to the technical field of steel rolling, and particularly relates to a method for directly cold-rolling stainless steel without annealing, which sequentially comprises the following steps: hot rolling, cold rolling, annealing and pickling of cold-rolled coils and finishing. The method for directly cold rolling the stainless steel without annealing has the advantages of shortening the production flow, improving the production efficiency, reducing the production cost and realizing the low-cost and high-efficiency production of the strip steel by omitting the annealing (pickling) procedure of the hot-rolled coil on the premise of ensuring that the performance of the finished product meets the standard requirement.

Description

Method for directly cold rolling stainless steel without annealing
Technical Field
The invention belongs to the technical field of steel rolling, and particularly relates to a method for directly cold rolling stainless steel without annealing.
Background
In recent years, the steel industry faces a serious challenge, and the product upgrading, cost reduction and efficiency improvement become the development targets of various steel enterprises. The production process flow of the traditional cold-rolled coil comprises the following steps: hot rolling → annealing and pickling of hot rolled coil → cold rolling → annealing and pickling of cold rolled coil → finishing, which has more production processes and long production cycle.
Therefore, the technology for producing the cold-rolled coils needs to be simplified and upgraded in the field so as to meet the requirements of times and situations.
Disclosure of Invention
In order to improve the production efficiency, the invention starts from optimizing the production process and route, optimizes the hot rolling process and the annealing and pickling process flow of the hot-rolled coil, and provides a method for directly cold rolling the stainless steel without annealing through continuous production tests.
In one aspect, the invention relates to a method for directly cold rolling stainless steel without annealing, which sequentially comprises the following steps: hot rolling, cold rolling, annealing and pickling of cold-rolled coils and finishing.
According to the method for directly cold rolling the stainless steel without annealing, after the hot rolling is finished, the coiling temperature is more than or equal to 750 ℃.
The method for directly cold rolling the stainless steel without annealing has the coiling temperature of 750-850 ℃ after the hot rolling is finished.
According to the method for directly cold rolling the stainless steel without annealing, the total rolling deformation rate of the cold rolling is less than or equal to 60%, the first pass deformation rate is 20-30%, and the finished product pass deformation rate is less than or equal to 10%.
According to the method for directly cold rolling the stainless steel without annealing, the total rolling deformation rate of the cold rolling is 40-60%, the first pass deformation rate is 20-30%, and the finished product pass deformation rate is 5-10%.
According to the method for directly cold rolling the stainless steel without annealing, the nominal thickness of the cold-rolled coil is more than or equal to 1.0 mm.
The method for directly cold rolling the stainless steel without annealing has the rolling speed of 70-90 m/min.
The method for directly cold rolling the stainless steel without annealing further comprises a hot rolled coil pickling process between the hot rolling and the cold rolling.
The method for directly cold rolling the stainless steel without annealing has the rolling speed of 70-100 m/min.
The method for directly cold rolling the stainless steel without annealing is characterized in that the stainless steel is ferritic stainless steel or austenitic stainless steel.
The technical scheme of the invention has the following beneficial effects:
(1) according to the method for directly cold rolling the stainless steel without annealing, the process parameters are reasonably controlled, the bell-type furnace annealing process of the hot-rolled coil is omitted, the non-annealed hot-rolled coil is directly cold-rolled, and the smooth rolling of the ferritic stainless steel and the austenitic stainless steel is realized;
(2) the method for directly cold rolling the stainless steel without annealing has the advantages of shortening the production flow, improving the production efficiency, reducing the production cost and realizing the low-cost and high-efficiency production of the strip steel by omitting the annealing (pickling) procedure of the hot-rolled coil on the premise of ensuring that the performance of the finished product meets the standard requirement.
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.
Specifically, the method for directly cold rolling the stainless steel without annealing sequentially comprises the following steps: hot rolling, cold rolling, annealing and pickling of cold-rolled coils and finishing.
Compared with the conventional production process route, the method omits the annealing process of the hot-rolled coil, and the unannealed hot-rolled coil with the iron oxide scale can be directly cold-rolled, or can be cold-rolled after removing the surface iron oxide scale by acid cleaning.
The invention is based on the following principle: the purpose of continuous annealing is to adjust grain size, soften the strip, and remove the processing stresses for further cold working deformation. Researches find that after the hot rolling coiling temperature is increased, certain crystal grains of the hot rolled plate are recrystallized and grown up in the coiling process, and partial processing stress can be eliminated. The hot-rolled coil coiled at high temperature has certain plasticity, and the elongation of ferritic stainless steel is about 20 percent, and the elongation of austenitic stainless steel is about 28 percent. Therefore, under the condition of low total deformation rate of cold rolling, the annealing process can be omitted, and the cold plate is directly rolled to the target thickness.
In some preferred embodiments, the method for direct cold rolling of stainless steel of the present invention without annealing comprises, in order: the hot rolling, cold rolling coil annealing, pickling and finishing, namely the process route is as follows: hot rolling → cold rolling → annealing and pickling of cold-rolled coil → finishing. Compared with the conventional production process route, the invention omits the processes of bell-type furnace annealing of the hot-rolled coil and acid pickling of the hot-rolled coil, and the unannealed hot-rolled coil with the iron oxide scale is directly subjected to cold rolling.
In still other preferred embodiments, the method for direct cold rolling of stainless steel of the present invention without annealing comprises, in order: hot rolling, pickling of hot-rolled coils, cold rolling, annealing and pickling of cold-rolled coils and finishing. Namely, the process route is as follows: hot rolling → acid washing of hot rolled coil → cold rolling → annealing and acid washing of cold rolled coil → finishing. Compared with the conventional production process route, the invention omits the annealing process of the hot-rolled coil, and the hot-rolled coil subjected to acid washing to remove the iron oxide scale is subjected to cold rolling.
In the invention, the stainless steel is hot-rolled without using laminar cooling water to cool so as to keep the hot-rolling coiling temperature above 750 ℃ and further promote the recrystallization and growth of crystal grains. When the coiling temperature is less than 750 ℃, the strip structure of the strip steel is obvious, and the conditions of grain recovery and recrystallization are poor.
More preferably, the coiling temperature is 750-850 ℃, the implementation effect of the invention is better.
Preferably, the total rolling deformation rate of the cold rolling is less than or equal to 60 percent, the first pass deformation rate is 20 to 30 percent, and the finished product pass deformation rate is less than or equal to 10 percent. The invention can ensure the mechanical property of the product on one hand and reduce the rolling load of the rolling mill on the other hand by controlling the rolling deformation rate.
When the total rolling deformation rate of the cold rolling is more than 60%, the risks of damage to a rolling mill, cracking of strip steel and the like due to excessive deformation resistance can be caused. When the first-pass deformation rate of cold rolling is less than 20%, the subsequent-pass deformation resistance is increased, and the problem of overlarge load of a rolling mill is also caused; when the first-pass deformation rate of the cold rolling is more than 30%, the first-pass rolling deformation is too large and exceeds the capacity range of the rolling mill, so that the rolling mill is damaged. When the pass deformation rate of the finished product is more than 10%, the surface mechanical defects such as scratches and the like are easily generated on the surface of the strip steel.
Further preferably, the total rolling deformation rate of the cold rolling is 45-60%, the first pass deformation rate is 20-30%, and the finished product pass deformation rate is 6-10%.
Wherein the nominal thickness of the cold-rolled coil is more than or equal to 1.0 mm.
The surface roughness of the raw material is influenced by whether acid washing is carried out or not: when the steel is not pickled, the surface of the raw material is covered with ferric oxide scale, the surface roughness is low, and the rolling speed needs to be reduced in order to prevent the phenomenon of slipping in the cold rolling process; otherwise, the rolling speed can be increased appropriately.
Preferably, the rolling speed of the cold rolling is 70-90m/min when the hot rolled coil is not pickled, and the rolling speed of the cold rolling is 70-100m/min when the hot rolled coil is pickled.
Wherein the stainless steel is ferritic stainless steel or austenitic stainless steel.
According to the method for directly cold-rolling the stainless steel without annealing, the performance of the stainless steel after cold-rolling, cold-plate annealing and pickling meets the relevant standard requirements. After the annealing (+ pickling) process is omitted, the production efficiency is greatly improved, the production efficiency of the conventional ferritic stainless steel can be improved by more than 60%, and the production efficiency of the conventional austenitic stainless steel can be improved by more than 15%.
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 carried out according to conventional methods and conditions.
Example 1
(1) A ferritic stainless steel, composition C: 0.039%, Si: 0.38%, Mn: 0.42%, P: 0.025%, S: 0.005%, Cr: 16.32%, the balance being Fe and unavoidable impurities.
(2) Process route
Hot rolling → cold rolling → annealing and pickling of cold-rolled coil → finishing.
(3) Hot rolling process
After hot rolling, no laminar cooling water was used, and the coiling temperature was 756 ℃.
(4) Cold rolling process
The total rolling deformation rate of cold rolling is 50%, the first pass deformation rate of rolling is 25%, and the pass deformation rate of finished products is 8.5%; the thickness of the finished cold-rolled coil is 1.5 mm; the actual range of the rolling speed is 70-86 m/min.
The rolling process is stable, the rolling pressure is slightly greater than that of the conventional process, no obvious fluctuation occurs, and the elongation after fracture of the finished product is 26 percent, thereby meeting the standard requirement.
Example 2
(1) An austenitic stainless steel, composition Si: 0.52%, Mn: 0.89%, P: 0.020%, S: 0.003%, Cr: 18.71%, Ni: 8.11%, the balance being Fe and unavoidable impurities.
(2) Process route
Hot rolling → acid washing of hot rolled coil → cold rolling → annealing and acid washing of cold rolled coil → finishing;
(3) hot rolling process
Laminar cooling water is not used after hot rolling, and the coiling temperature is 776 ℃.
(4) Cold rolling process
The total rolling deformation rate of cold rolling is 50%, the first pass deformation rate of rolling is 28%, and the pass deformation rate of finished products is 8.1%; the thickness of the finished cold-rolled coil is 2.0 mm; the actual range of the rolling speed is 74-98 m/min.
The rolling process is stable, the rolling pressure does not fluctuate obviously, and the elongation after fracture of the finished product is 55 percent and meets the standard requirement.
Comparative example 1
(1) A ferritic stainless steel, composition C: 0.035%, Si: 0.37%, Mn: 0.39%, P: 0.026%, S: 0.002%, Cr: 16.22%, the balance being Fe and unavoidable impurities.
(2) Process route
Hot rolling → cold rolling → annealing and pickling of cold-rolled coil → finishing; compared with the conventional production process route, the invention omits the bell-type furnace annealing of the hot-rolled coil and the acid pickling process of the hot-rolled coil, and the unannealed hot-rolled coil with the iron oxide scale is directly subjected to cold rolling.
(3) Hot rolling process
After hot rolling, laminar cooling water was used at a coiling temperature of 625 ℃.
(4) Cold rolling process
The total rolling deformation rate of cold rolling is 50%, the first pass deformation rate of rolling is 26%, and the pass deformation rate of finished products is 8.2%; the thickness of the finished cold-rolled coil is 1.5 mm; the actual range of the rolling speed is 70-86 m/min.
The rolling process has fluctuation, the rolling pressure is higher than that of the invention, the load of the rolling mill is increased, the elongation of the finished product after fracture is 22.5 percent and is close to the national lower limit (22 percent), and the product can crack in the using process.
Comparative example 2
(1) A ferritic stainless steel, composition C: 0.040%, Si: 0.32%, Mn: 0.45%, P: 0.028%, S: 0.003%, Cr: 16.17%, the balance being Fe and unavoidable impurities.
(2) Process route
Hot rolling → cold rolling → annealing and pickling of cold-rolled coil → finishing.
(3) Hot rolling process
After hot rolling, laminar cooling water is not used, and the coiling temperature is 758 ℃.
(4) Cold rolling process
The total rolling deformation rate of cold rolling is 71 percent, the first pass deformation rate of rolling is 26 percent, and the pass deformation rate of finished products is 6.4 percent; the target thickness of the finished cold-rolled coil is 1.0 mm; the actual range of the rolling speed is 70-88 m/min.
The rolling process has fluctuation, the rolling pressure is obviously increased, the load of the rolling mill is increased, and after the rolling process reaches the 7 th pass, the rolling pressure is close to the upper limit of the rolling mill; the elongation after fracture of the finished product is 22.5 percent and is close to the lower limit of the national standard (22 percent), and the product can have cracking risk during use.
The present invention has been disclosed in the foregoing in terms of preferred embodiments, but it will be understood by those skilled in the art that these embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of the present invention. It should be noted that all changes and substitutions that are equivalent to these embodiments are deemed to be within the scope of the claims of the present invention. Therefore, the protection scope of the present invention should be subject to the scope defined in the claims.

Claims (10)

1. A method for directly cold rolling stainless steel without annealing is characterized by sequentially comprising the following steps: hot rolling, cold rolling, annealing and pickling of cold-rolled coils and finishing.
2. The method for direct cold rolling of stainless steel without annealing according to claim 1, wherein the coiling temperature is not less than 750 ℃ after the hot rolling is finished.
3. The method for cold rolling stainless steel without annealing as claimed in claim 2, wherein the coiling temperature is 750-850 ℃ after the hot rolling is finished.
4. The method for the non-annealing direct cold rolling of stainless steel according to claim 1, wherein the total rolling deformation rate of the cold rolling is less than or equal to 60%, the first pass deformation rate is 20% -30%, and the finished pass deformation rate is less than or equal to 10%.
5. The method of claim 1, wherein the total rolling deformation rate of the cold rolling is 40-60%, the first pass deformation rate is 20-30%, and the final pass deformation rate is 5-10%.
6. The non-annealing direct cold rolling method of stainless steel according to claim 1, wherein the nominal thickness of the cold rolled sheet is greater than or equal to 1.0 mm.
7. The method for direct cold rolling of stainless steel without annealing according to claim 1, wherein the rolling speed of the cold rolling is 70-90 m/min.
8. The method for non-annealing direct cold rolling of stainless steel according to claim 1, further comprising a hot rolled coil pickling process between the hot rolling and the cold rolling.
9. The method for direct cold rolling of stainless steel without annealing according to claim 8, wherein the rolling speed of the cold rolling is 70-100 m/min.
10. The method of non-annealed direct cold rolling of stainless steel according to claim 1, wherein the stainless steel is a ferritic stainless steel or an austenitic stainless steel.
CN202110639562.0A 2021-06-08 2021-06-08 Method for directly cold rolling stainless steel without annealing Pending CN113385537A (en)

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Application Number Priority Date Filing Date Title
CN202110639562.0A CN113385537A (en) 2021-06-08 2021-06-08 Method for directly cold rolling stainless steel without annealing

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Application Number Priority Date Filing Date Title
CN202110639562.0A CN113385537A (en) 2021-06-08 2021-06-08 Method for directly cold rolling stainless steel without annealing

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112941399A (en) * 2021-01-27 2021-06-11 浦项(张家港)不锈钢股份有限公司 409L stainless steel and preparation method thereof
CN114833197A (en) * 2022-04-21 2022-08-02 山西太钢不锈钢股份有限公司 Production method of low-cost stainless steel cold-rolled steel strip

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102989771A (en) * 2011-09-19 2013-03-27 宝山钢铁股份有限公司 Low-chromium ferritic stainless steel cold continuous rolling manufacturing method
CN103191928A (en) * 2013-04-10 2013-07-10 张家港浦项不锈钢有限公司 304 stainless steel strip and production method thereof
CN103506381A (en) * 2012-06-28 2014-01-15 宝钢不锈钢有限公司 Rolling method for solving surface wrinkling problem of ferritic stainless steel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102989771A (en) * 2011-09-19 2013-03-27 宝山钢铁股份有限公司 Low-chromium ferritic stainless steel cold continuous rolling manufacturing method
CN103506381A (en) * 2012-06-28 2014-01-15 宝钢不锈钢有限公司 Rolling method for solving surface wrinkling problem of ferritic stainless steel
CN103191928A (en) * 2013-04-10 2013-07-10 张家港浦项不锈钢有限公司 304 stainless steel strip and production method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112941399A (en) * 2021-01-27 2021-06-11 浦项(张家港)不锈钢股份有限公司 409L stainless steel and preparation method thereof
CN114833197A (en) * 2022-04-21 2022-08-02 山西太钢不锈钢股份有限公司 Production method of low-cost stainless steel cold-rolled steel strip

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Application publication date: 20210914