CN115094216B - Method for eliminating color difference defect of TRIP high-strength steel - Google Patents
Method for eliminating color difference defect of TRIP high-strength steel Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 27
- 239000010959 steel Substances 0.000 title claims abstract description 27
- 230000007547 defect Effects 0.000 title claims abstract description 14
- 238000000137 annealing Methods 0.000 claims abstract description 40
- 238000005096 rolling process Methods 0.000 claims abstract description 29
- 238000005098 hot rolling Methods 0.000 claims abstract description 27
- 239000002253 acid Substances 0.000 claims abstract description 26
- 230000009467 reduction Effects 0.000 claims abstract description 21
- 238000005554 pickling Methods 0.000 claims abstract description 20
- 230000008569 process Effects 0.000 claims abstract description 20
- 238000005406 washing Methods 0.000 claims abstract description 11
- 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 3
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 2
- 238000009826 distribution Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 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 5
- 238000001556 precipitation Methods 0.000 abstract description 4
- 230000004075 alteration Effects 0.000 abstract description 3
- 238000004886 process control Methods 0.000 abstract description 2
- 230000006698 induction Effects 0.000 abstract 1
- 230000000452 restraining effect Effects 0.000 abstract 1
- 229910000794 TRIP steel Inorganic materials 0.000 description 5
- 238000005097 cold rolling Methods 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 229910000720 Silicomanganese Inorganic materials 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 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
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000003929 acidic solution Substances 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
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 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
- 230000002787 reinforcement Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 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 chromatic aberration defects of TRIP high-strength steel, which comprises the steps of hot rolling, acid washing and continuous annealing. The method specifically comprises the steps of reducing the hot rolling coiling temperature, improving the withdrawal elongation, reducing the pickling speed, improving the temperature of a pickling tank, increasing the acid and water exchange amount, improving the sealing performance of a continuous annealing furnace, reducing the total rolling reduction, redistributing the five-pass reduction, 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 root causes of defect generation, the color difference defect of TRIP high-strength steel after annealing can be effectively restrained by restraining or pushing 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. 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 chromatic aberration defects of TRIP high-strength steel.
Background
TRIP steel is a high-strength steel with TRIP effect, and the structure of TRIP steel mainly comprises ferrite, bainite and residual austenite. Ferrite is a matrix structure, has low hardness and good plasticity, and accounts for 50% -60%; bainite is a hard phase in TRIP steel, accounting for 25% -40%; the retained austenite is the source of TRIP effect and accounts for 5-15%.
When TRIP steel is subjected to plastic deformation, the retained austenite induces martensite transformation, the hardness of the martensite is high, so that the local hardness is improved, the deformation is more difficult to continue, the deformation is further transferred to surrounding tissues, the generation of necking is delayed, and the material obtains very high plasticity along with the continuous development of the transformation. The volume of the residual austenite is increased during transformation, the surrounding matrix is pressed to generate plastic deformation, the dislocation density is increased, dislocation reinforcement is generated, meanwhile, the strength of the material is also improved by martensite generated by transformation, and the plasticity and the strength of the steel plate after transformation are both improved.
However, in actual production, the content of silicon and manganese in part of TRIP steel is high. In the hot rolling process of the strip steel, because substances which are easy to oxidize, such as silicon-manganese and the like, on the surface of the base layer of the strip steel are separated out to the surface in a high-temperature state after hot rolling and coiling, the substances which are close to the surface of the base layer of the strip steel are difficult to remove through a process under normal process conditions. After rolling by a rolling mill, the material is pressed in or elongated in the rolling direction, and surface color differences with different oxidation degrees can be presented after annealing. For example, in the preparation process of the galvanized substrate TRIP800 with high silicon and manganese content, the phenomenon is particularly remarkable, the coating of the galvanized zinc layer is seriously affected, and the use of users cannot be satisfied. Therefore, there is a need for a simple, effective, and low cost treatment to alleviate and eliminate this drawback.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, 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 is very easy to remove under the acidic solution. Therefore, the method starts from the analysis of root causes of defect generation, and suppresses or advances the precipitation, removal, indentation 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 suppressed.
The specific scheme is as follows:
a method for eliminating color difference defect of TRIP high-strength steel comprises hot rolling, acid washing and continuous annealing;
the hot rolling process is to reduce the hot rolling coiling temperature;
the acid washing process comprises the steps of improving the tensile elongation percentage, reducing the acid washing speed, improving the temperature of a pickling tank, and increasing the acid and water exchange quantity;
the rolling process comprises the steps of reducing the total rolling reduction and adjusting the rolling force distribution of each stand;
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 ℃, so that the precipitation of the silicomanganese oxide can be effectively reduced.
Preferably, the tensile elongation is 1.1-1.3.
Preferably, the pickling speed is 130-150 mpm.
Preferably, the temperature of the pickling tank is 80-90 ℃.
Preferably, the acid conversion amount is 13-15 m 3 /h。
Preferably, the water change amount is 9-11 m 3 /h。
Preferably, the total reduction is 50.00-54.00%.
Preferably, the five passes have a reduction of 13.00-15.00%, 12.00-14.00%, 11.50-13.50%, 11.00-13.00% and 0.50-0.70%, respectively.
Preferably, the oxygen content is 4ppm or less.
Preferably, the hydrogen content is 5.5 to 6.5%.
The description of the method for eliminating the color difference defect of the TRIP high-strength steel focuses on the limitation of key technical parameters, and for other conventional steps, the process steps can be carried out in a mode disclosed by the prior art, so that the process requirements are met.
The beneficial effects of the invention are as follows:
(1) the invention can effectively reduce the precipitation of the silicon manganese oxide by reducing the hot rolling coiling temperature.
(2) The invention can effectively improve the phosphorus breaking effect, improve the acid cleaning effect and remove the silicon-manganese oxide by improving the extension rate of the withdrawal and straightening, reducing the acid cleaning speed, improving the temperature of the acid cleaning tank and increasing the acid and water changing amount.
(3) The method reduces the pressing-in and elongation of the silicomanganese oxide by reducing the total rolling reduction and redistributing the rolling reduction of each pass;
(4) the invention can improve the reduction effect of the silicon-manganese oxide by improving the tightness 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.
(5) The invention can effectively restrain the color difference defect of the TRIP high-strength steel after annealing, has simple process, no equipment investment, good effect, low cost and wide application prospect.
Detailed Description
The following non-limiting examples will enable those of ordinary skill in the art to more fully understand the invention and are not intended to limit the invention in any way.
The test methods described in the following examples, unless otherwise specified, are all conventional; the reagents and materials, unless otherwise specified, are commercially available.
Example 1
The continuous annealing unit of the steel cold rolling mill 1630 is adopted to produce TRIP high-strength steel, and the continuous annealing unit comprises the process steps of hot rolling, acid washing and continuous annealing. Wherein the key process parameters are as follows:
(1) in the hot rolling process, the hot rolling coiling temperature is 570 ℃;
(2) in the pickling process, the tensile elongation is 1.2 percent,the pickling speed is 140mpm, the pickling tank temperature is 85 ℃, and the acid conversion amount is 14m 3 And/h, the water exchange amount is 10m 3 /h。
(3) In the rolling process, the total rolling reduction is 52.05 percent, and the rolling reduction of five passes is 14.27 percent, 12.91 percent, 12.52 percent, 11.78 percent and 0.57 percent respectively;
(4) 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%.
Example 2
The continuous annealing unit of the steel cold rolling mill 1630 is adopted to produce TRIP high-strength steel, and the continuous annealing unit comprises the process steps of hot rolling, acid washing and continuous annealing. Wherein the key process parameters are as follows:
(1) in the hot rolling process, the hot rolling coiling temperature is 560 ℃;
(2) in the pickling process, the tensile elongation is 1.1%, the pickling speed is 130mpm, the pickling tank temperature is 80 ℃, and the acid conversion amount is 14m 3 And/h, the water exchange amount is 10m 3 /h。
(3) In the rolling process, the total rolling reduction is 52.28%, and the rolling reduction of five passes is 13.89%,13.11%,12.63%,12.07% and 0.58% respectively.
(4) 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 continuous annealing unit of the steel cold rolling mill 1630 is adopted to produce TRIP high-strength steel, and the continuous annealing unit comprises the process steps of hot rolling, acid washing and continuous annealing. Wherein the key process parameters are as follows:
(1) in the hot rolling process, the hot rolling coiling temperature is 580 ℃;
(2) in the pickling process, the tensile elongation is 1.3%, the pickling speed is 150mpm, the pickling tank temperature is 90 ℃, and the acid conversion amount is 14m 3 And/h, the water exchange amount is 10m 3 /h。
(3) In the rolling process, the total rolling reduction is 52.15 percent, and the rolling reduction of five passes is 14.08 percent, 13.38 percent, 12.33 percent, 11.81 percent and 0.55 percent respectively.
(4) 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 of the steel cold rolling mill 1630 is adopted to produce TRIP high-strength steel, and the continuous annealing unit comprises the process steps of hot rolling, acid washing and continuous annealing. Wherein the key process parameters are as follows:
(1) in the hot rolling process, the hot rolling coiling temperature is 600 ℃;
(2) in the pickling process, the tensile elongation is 0.6%, the pickling speed is 200mpm, the pickling tank temperature is 75 ℃, and the acid conversion amount is 8m 3 And/h, the water exchange amount is 5m 3 /h。
(3) In the rolling process, the total rolling reduction is 62.36 percent, and the rolling reduction of five passes is 16.72 percent, 18.63 percent, 16.06 percent, 10.32 percent and 0.63 percent respectively.
(4) 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.
Detection result
As can be seen from Table 1, the degradation rate of the surface color difference of TRIP high-strength steel produced by adopting the 1630 continuous annealing unit of the steel cold rolling mill according to the method of comparative example 1 (prior art) is 50-60%. And the degradation rate of the surface chromatic aberration of TRIP high-strength steel produced by the methods of examples 1-3 (the patent) is 0.
Table 1 comparison of the results of the treatment of the invention using the methods of examples 1 to 3 and comparative example 1
Claims (2)
1. The method for eliminating the color difference defect of the TRIP high-strength steel is characterized by comprising the steps of a hot rolling process, an acid washing process, a rolling process and a continuous annealing process;
the hot rolling process is to reduce the hot rolling coiling temperature;
the acid washing process comprises the steps of improving the tensile elongation, reducing the acid washing speed, improving the temperature of a pickling tank, and increasing the acid exchange amount and the water exchange amount;
the rolling process comprises the steps of reducing the total rolling reduction and adjusting the rolling force distribution of each stand;
the continuous annealing process comprises the steps of improving the sealing performance of a 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;
the elongation of the withdrawal and straightening is 1.1-1.3;
the acid conversion amount is 13-15 m 3 /h；
The water change amount is 9-11 m 3 /h；
The total rolling reduction is 50.00-54.00%;
the reduction ratios of five passes in the rolling process are respectively 13.00-15.00%, 12.00-14.00%, 11.50-13.50%, 11.00-13.00% and 0.50-0.70%;
the oxygen content is less than or equal to 4ppm, and the hydrogen content is 5.5-6.5%;
the pickling speed is 130-150 mpm;
the temperature of the pickling tank is 80-90 ℃.
2. The method of claim 1, wherein the hot rolling coiling temperature is 560-580 ℃.
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| 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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| 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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| CN115094216B true CN115094216B (en) | 2023-11-17 |
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|---|---|---|---|---|
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101808431B1 (en) * | 2016-06-21 | 2017-12-13 | 현대제철 주식회사 | High strength cold- rolled steel sheet having improved workablity and method of manufacturing the same |
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- 2022-06-23 CN CN202210726599.1A patent/CN115094216B/en active Active
Patent Citations (6)
| 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 |
| 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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