CN115094216A - Method for eliminating TRIP high-strength steel color difference defect - Google Patents
Method for eliminating TRIP high-strength steel color difference defect Download PDFInfo
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- CN115094216A CN115094216A CN202210726599.1A CN202210726599A CN115094216A CN 115094216 A CN115094216 A CN 115094216A CN 202210726599 A CN202210726599 A CN 202210726599A CN 115094216 A CN115094216 A CN 115094216A
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- pickling
- hot rolling
- reducing
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 29
- 239000010959 steel Substances 0.000 title claims abstract description 29
- 230000007547 defect Effects 0.000 title claims abstract description 15
- 238000000137 annealing Methods 0.000 claims abstract description 36
- 238000005554 pickling Methods 0.000 claims abstract description 33
- 238000005098 hot rolling Methods 0.000 claims abstract description 27
- 230000008569 process Effects 0.000 claims abstract description 22
- 230000009467 reduction Effects 0.000 claims abstract description 21
- 239000002253 acid Substances 0.000 claims abstract description 20
- 238000005096 rolling process Methods 0.000 claims abstract description 16
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 10
- 239000001257 hydrogen Substances 0.000 claims abstract description 10
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 10
- 239000001301 oxygen Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 230000008859 change Effects 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 2
- 235000021110 pickles Nutrition 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- GDJWXDKMRWCHJH-UHFFFAOYSA-N [Si+4].[O-2].[Mn+2].[O-2].[O-2] Chemical compound [Si+4].[O-2].[Mn+2].[O-2].[O-2] GDJWXDKMRWCHJH-UHFFFAOYSA-N 0.000 abstract description 7
- 238000001556 precipitation Methods 0.000 abstract description 4
- 230000004075 alteration Effects 0.000 abstract description 2
- 238000004886 process control Methods 0.000 abstract description 2
- 230000006698 induction Effects 0.000 abstract 1
- 230000005764 inhibitory process Effects 0.000 abstract 1
- 230000009466 transformation Effects 0.000 description 5
- 229910000794 TRIP steel Inorganic materials 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 238000005097 cold rolling Methods 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 229910001563 bainite Inorganic materials 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- 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
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
-
- 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
-
- 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
Abstract
The invention discloses a method for eliminating the color difference defect of TRIP high-strength steel, which comprises the steps of hot rolling, acid pickling and continuous annealing. The method specifically comprises the steps of reducing the hot rolling coiling temperature, improving the straightening elongation, reducing the pickling speed, improving the temperature of a pickling tank, increasing the acid exchange and water exchange amount, improving the sealing property of a continuous annealing furnace, reducing the total rolling reduction rate, redistributing the five-pass reduction rate, reducing the oxygen content of each section in the continuous annealing furnace and improving the hydrogen content of each section in the furnace. From the analysis of the root cause of the defect generation, the inhibition or propulsion is carried out on the precipitation, removal, pressing-in and reduction nodes of the silicon-manganese oxide through the process control of the whole flow of hot rolling, acid rolling and continuous annealing, and the defect of chromatic aberration of the TRIP high-strength steel after annealing can be effectively inhibited. The method has the advantages of simple process, no equipment investment, good effect, low cost and wide application prospect.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for eliminating TRIP high-strength steel color difference defects.
Background
The TRIP steel is a high-strength steel with TRIP effect, and the structure of the TRIP steel mainly consists of three phases of ferrite, bainite and residual austenite. Ferrite is a matrix structure, has low hardness and good plasticity, and accounts for 50-60 percent; bainite is a hard phase in the TRIP steel, and accounts for 25-40 percent; the retained austenite is the source of TRIP effect, and accounts for 5-15%.
When the TRIP steel is subjected to plastic deformation, the retained austenite induces martensite phase transformation, the local hardness is improved due to the high hardness of the martensite, the continuous deformation is difficult, meanwhile, the deformation is further transferred to the surrounding tissues, the generation of necking is delayed, and the material obtains high plasticity along with the continuous development of the phase transformation. The volume of the residual austenite is increased during phase transformation, the surrounding matrix is pressed to be subjected to plastic deformation, the dislocation density is increased, dislocation strengthening is generated, simultaneously, the martensite generated by the phase transformation also enables the strength of the material to be improved, and the plasticity and the strength of the steel plate after the phase transformation are improved.
However, in actual production, the silicon and manganese contents of some TRIP steels are high. In the hot rolling process of strip steel, easily-oxidized substances such as silicon, manganese and the like on the base layer of the surface of the strip steel are precipitated towards the surface in a high-temperature state after hot rolling and coiling, so that the oxidized substances close to the surface of the base layer of the strip steel are difficult to remove by a process under normal process conditions. After rolling by a rolling mill, the steel plate is pressed in or elongated in the rolling direction, and surface color difference with different oxidation degrees can be presented after annealing. For example, in the preparation process of the electro-galvanized substrate TRIP800 with high silicon and manganese contents, the phenomenon is particularly prominent, the coating of the electro-galvanized layer is seriously influenced, and the use requirement of users cannot be met. Therefore, there is a need for a treatment method with simple process, good effect and low cost to alleviate and eliminate the defect.
Disclosure of Invention
Aiming at the existing defects and shortcomings, the invention aims to provide a method for eliminating the color difference defect of TRIP high-strength steel. Although the silicon-manganese element is easy to oxidize, the oxide thereof is extremely easy to remove in an acid solution. Therefore, the method starts from the analysis of the root cause of the defect generation, and inhibits or advances the precipitation, removal, pressing and reduction nodes of the silicon-manganese oxide through the process control of the whole flow of hot rolling, acid rolling and continuous annealing, so that the color difference defect of the TRIP high-strength steel after annealing can be effectively inhibited.
The specific scheme is as follows:
a method for eliminating the color difference defect of TRIP high-strength steel comprises the steps of hot rolling, acid pickling and continuous annealing;
the hot rolling process is to reduce the hot rolling coiling temperature;
the pickling process comprises the steps of improving the withdrawal and straightening elongation, reducing the pickling speed, improving the temperature of a pickling tank, and increasing the acid exchange and water exchange amount;
the rolling process comprises the steps of reducing the total reduction rate and adjusting the distribution of the rolling force of each rack;
the continuous annealing process comprises the steps of improving the sealing performance of the continuous annealing furnace, reducing the oxygen content of each section in the continuous annealing furnace and improving the hydrogen content of each section in the furnace.
Preferably, the hot rolling coiling temperature is 560-580 ℃, and the precipitation of silicon-manganese oxide can be effectively reduced.
Preferably, the withdrawal and straightening elongation is 1.1-1.3.
Preferably, the pickling speed is 130-150 mpm.
Preferably, the temperature of the pickling tank is 80-90 ℃.
Preference is given toThe acid changing amount is 13-15 m 3 /h。
Preferably, the water exchange amount is 9-11 m 3 /h。
Preferably, the total reduction rate is 50.00-54.00%.
Preferably, the rolling reduction rates of the five passes are respectively 13.00-15.00%, 12.00-14.00%, 11.50-13.50%, 11.00-13.00% and 0.50-0.70%.
Preferably, the oxygen content is < 4 ppm.
Preferably, the hydrogen content is 5.5-6.5%.
The method for eliminating the TRIP high-strength steel color difference defect emphasizes the limitation of key technical parameters, and for other conventional steps, the process steps can be carried out in a manner disclosed by the prior art, so that the process requirements can be met.
The beneficial effects of the invention are as follows:
firstly, the invention can effectively reduce the precipitation of silicon-manganese oxide by reducing the hot rolling coiling temperature.
Secondly, the invention can effectively improve the effect of breaking phosphorus, improve the pickling effect and remove the silicon-manganese oxide by improving the elongation of straightening, reducing the pickling speed, improving the temperature of a pickling tank and increasing the amount of acid and water change.
Thirdly, the invention reduces the press-in and elongation of the silicon-manganese oxide by reducing the total reduction and redistributing the reduction of each pass;
the invention can improve the reduction effect of the silicon-manganese oxide by improving the sealing performance of the continuous annealing furnace, reducing the oxygen content of each section in the continuous annealing furnace, improving the hydrogen content of each section in the furnace.
The method can effectively inhibit the defect of chromatic aberration of the annealed TRIP high-strength steel, and has the advantages of simple process, no equipment investment, good effect, low cost and wide application prospect.
Detailed Description
The following non-limiting examples are presented to enable those of ordinary skill in the art to more fully understand the present invention and are not intended to limit the invention in any way.
The test methods described in the following examples are all conventional methods unless otherwise specified; the reagents and materials are commercially available, unless otherwise specified.
Example 1
The continuous annealing unit 1630 of the steel cold rolling mill is used for producing TRIP high-strength steel and comprises the steps of hot rolling, acid pickling and continuous annealing. The key process parameters are as follows:
firstly, in the hot rolling process, the hot rolling coiling temperature is 570 ℃;
② in the pickling process, the straightening elongation is 1.2%, the pickling speed is 140mpm, the temperature of the pickling tank is 85 ℃, and the acid change amount is 14m 3 H, water exchange amount is 10m 3 /h。
③ in the rolling process, the total reduction rate is 52.05 percent, and the reduction rates of five passes are 14.27 percent, 12.91 percent, 12.52 percent, 11.78 percent and 0.57 percent respectively;
in the continuous annealing process, the oxygen content of each section in the continuous annealing furnace is less than or equal to 4ppm, and the hydrogen content is 6.0 percent.
Example 2
The continuous annealing unit 1630 of the steel cold rolling mill is used for producing TRIP high-strength steel and comprises the steps of hot rolling, acid pickling and continuous annealing. The key process parameters are as follows:
in the hot rolling process, the hot rolling coiling temperature is 560 ℃;
② in the pickling process, the straightening elongation is 1.1%, the pickling speed is 130mpm, the temperature of the pickling tank is 80 ℃, and the acid change amount is 14m 3 H, water exchange amount is 10m 3 /h。
③ in the rolling process, the total reduction rate is 52.28 percent, and the reduction rates of five passes are respectively 13.89 percent, 13.11 percent, 12.63 percent, 12.07 percent and 0.58 percent.
In the continuous annealing process, the oxygen content of each section in the continuous annealing furnace is less than or equal to 4ppm, and the hydrogen content is 5.5 percent.
Example 3
The method for producing TRIP high-strength steel by adopting the continuous annealing unit of the cold steel mill 1630 comprises the steps of hot rolling, acid pickling and continuous annealing. The key process parameters are as follows:
firstly, in the hot rolling process, the hot rolling coiling temperature is 580 ℃;
② in the pickling process, the straightening elongation is 1.3 percent, the pickling speed is 150mpm, the temperature of the pickling tank is 90 ℃, and the acid change amount is 14m 3 H, water exchange amount is 10m 3 /h。
③ in the rolling process, the total reduction rate is 52.15 percent, and the reduction rates of five passes are 14.08 percent, 13.38 percent, 12.33 percent, 11.81 percent and 0.55 percent respectively.
In the continuous annealing process, the oxygen content of each section in the continuous annealing furnace is less than or equal to 4ppm, and the hydrogen content is 6.5 percent.
Comparative example 1
The continuous annealing unit 1630 of the steel cold rolling mill is used for producing TRIP high-strength steel and comprises the steps of hot rolling, acid pickling and continuous annealing. The key process parameters are as follows:
firstly, in the hot rolling process, the hot rolling coiling temperature is 600 ℃;
② in the pickling process, the straightening elongation is 0.6%, the pickling speed is 200mpm, the temperature of the pickling tank is 75 ℃, and the acid change amount is 8m 3 H, water exchange amount is 5m 3 /h。
In the rolling process, the total reduction rate is 62.36%, and the reduction rates of five passes are respectively 16.72%, 18.63%, 16.06%, 10.32% and 0.63%.
In the continuous annealing process, the oxygen content of each section in the continuous annealing furnace is less than or equal to 10ppm, and the hydrogen content is 4.5 percent.
The result of the detection
From table 1, it can be seen that the surface color difference degradation rate of the TRIP high-strength steel produced by the continuous annealing unit of the steel cold rolling mill 1630 according to the method (prior art) of the comparative example 1 is 50-60%. The TRIP high-strength steel produced by the methods of examples 1 to 3 (patent) had a surface color difference degradation rate of 0.
TABLE 1 comparison of the results of the inventive and comparative examples 1 to 3
Claims (10)
1. A method for eliminating the color difference defect of TRIP high-strength steel is characterized by comprising the process steps of hot rolling, acid pickling, rolling and continuous annealing;
the hot rolling process is to reduce the hot rolling coiling temperature;
the pickling process comprises the steps of improving the withdrawal and straightening elongation, reducing the pickling speed, improving the temperature of a pickling tank, and increasing the acid exchange and water exchange amount;
the rolling process comprises the steps of reducing the total reduction rate and adjusting the distribution of the rolling force of each rack;
the continuous annealing process comprises the steps of improving the sealing performance of the continuous annealing furnace, reducing the oxygen content of each section in the continuous annealing furnace and improving the hydrogen content of each section in the continuous annealing furnace.
2. The method according to claim 1, wherein the hot rolling coiling temperature is 560 to 580 ℃.
3. The method according to claim 1, wherein the withdrawal elongation is 1.1 to 1.3.
4. The method according to claim 1, wherein the pickling speed is 130 to 150 mpm.
5. The method of claim 1, wherein the pickle tank temperature is 80 to 90 ℃.
6. The method of claim 1, wherein the amount of the acid change is 13-15 m 3 /h。
7. The method as claimed in claim 1, wherein the water exchange amount is 9-11 m 3 /h。
8. The method according to claim 1, wherein the total reduction rate is 50.00 to 54.00%.
9. The method as claimed in claim 1, wherein the reduction ratios of the five passes are 13.00 to 15.00%, 12.00 to 14.00%, 11.50 to 13.50%, 11.00 to 13.00% and 0.50 to 0.70%, respectively.
10. The method according to claim 1, wherein the oxygen content is 4ppm or less and the hydrogen content is 5.5 to 6.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210726599.1A CN115094216B (en) | 2022-06-23 | 2022-06-23 | Method for eliminating color difference defect of TRIP high-strength steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210726599.1A CN115094216B (en) | 2022-06-23 | 2022-06-23 | Method for eliminating color difference defect of TRIP high-strength steel |
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| CN115094216A true CN115094216A (en) | 2022-09-23 |
| CN115094216B CN115094216B (en) | 2023-11-17 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012064129A2 (en) * | 2010-11-10 | 2012-05-18 | (주)포스코 | Method for manufacturing high-strength cold-rolled/hot-rolled trip steel having a tensile strength of 590 mpa grade, superior workability, and low mechanical-property deviation |
| CN106623420A (en) * | 2016-12-26 | 2017-05-10 | 江苏省沙钢钢铁研究院有限公司 | Production method capable of controlling surface dense-stripe defects of continuous annealing DC01 strip steel |
| CN107893155A (en) * | 2017-10-31 | 2018-04-10 | 首钢集团有限公司 | A kind of method for eliminating phosphorous high-strength IF steel surface chromatic aberration defect |
| CN109929982A (en) * | 2019-03-19 | 2019-06-25 | 首钢集团有限公司 | A kind of production method of high-strength steel |
| US20190203310A1 (en) * | 2016-06-21 | 2019-07-04 | Hyundai Steel Company | High-strength cold-rolled steel sheet with excellent workability and manufacturing method therefor |
| CN111020129A (en) * | 2019-10-25 | 2020-04-17 | 本钢板材股份有限公司 | 700 MPa-grade cold-rolled TRIP steel plate and production method thereof |
| CN113560340A (en) * | 2021-07-14 | 2021-10-29 | 鞍钢股份有限公司 | Method for improving surface color difference of Gipa-grade high-strength steel |
-
2022
- 2022-06-23 CN CN202210726599.1A patent/CN115094216B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012064129A2 (en) * | 2010-11-10 | 2012-05-18 | (주)포스코 | Method for manufacturing high-strength cold-rolled/hot-rolled trip steel having a tensile strength of 590 mpa grade, superior workability, and low mechanical-property deviation |
| US20190203310A1 (en) * | 2016-06-21 | 2019-07-04 | Hyundai Steel Company | High-strength cold-rolled steel sheet with excellent workability and manufacturing method therefor |
| CN106623420A (en) * | 2016-12-26 | 2017-05-10 | 江苏省沙钢钢铁研究院有限公司 | Production method capable of controlling surface dense-stripe defects of continuous annealing DC01 strip steel |
| CN107893155A (en) * | 2017-10-31 | 2018-04-10 | 首钢集团有限公司 | A kind of method for eliminating phosphorous high-strength IF steel surface chromatic aberration defect |
| CN109929982A (en) * | 2019-03-19 | 2019-06-25 | 首钢集团有限公司 | A kind of production method of high-strength steel |
| CN111020129A (en) * | 2019-10-25 | 2020-04-17 | 本钢板材股份有限公司 | 700 MPa-grade cold-rolled TRIP steel plate and production method thereof |
| CN113560340A (en) * | 2021-07-14 | 2021-10-29 | 鞍钢股份有限公司 | Method for improving surface color difference of Gipa-grade high-strength steel |
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Effective date of registration: 20230905 Address after: 117000 No. 16 Renmin Road, Pingshan District, Liaoning, Benxi Applicant after: BENGANG STEEL PLATES Co.,Ltd. Applicant after: Benxi Steel Puxiang Cold-Rolled Sheet Co.,Ltd. Address before: 117000 No. 16 Renmin Road, Pingshan District, Liaoning, Benxi Applicant before: BENGANG STEEL PLATES Co.,Ltd. |
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