CN114737127A - High-strength low-alloy steel hot-dip galvanized steel plate and production method thereof - Google Patents
High-strength low-alloy steel hot-dip galvanized steel plate and production method thereof Download PDFInfo
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- CN114737127A CN114737127A CN202210417210.5A CN202210417210A CN114737127A CN 114737127 A CN114737127 A CN 114737127A CN 202210417210 A CN202210417210 A CN 202210417210A CN 114737127 A CN114737127 A CN 114737127A
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- 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
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- 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
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- 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
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- 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
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- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
- C23C2/06—Zinc or cadmium or alloys based thereon
-
- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
Abstract
The invention belongs to the technical field of hot-dip galvanized steel sheet production, and particularly discloses a high-strength low-alloy steel hot-dip galvanized steel sheet with better mechanical property and a production method for preparing the hot-dip galvanized steel sheet. The high-strength low-alloy steel hot-dip galvanized steel sheet comprises the following chemical components: c, according to weight percentage: 0.09-0.12%, Si: 0.22-0.60%, Mn: 1.0-1.5%, P: 0.010-0.040%, S: less than or equal to 0.015 percent, Als: 0.020 to 0.080%, Nb: 0.055-0.080%, and the balance of Fe and inevitable impurities. The high-strength low-alloy steel hot-dip galvanized steel plate ensures the purity of steel by strictly controlling C, N and other interstitial atoms, particularly designs quantitative components of Si, Mn and Nb contents, finally ensures that the yield strength reaches 440-480 MPa, the tensile strength reaches 540-600 MPa and the elongation is more than or equal to 28.0 percent, has better mechanical property, ensures that the tensile strength and the elongation simultaneously meet the use requirements of automobile outer plates, and is particularly suitable for manufacturing structural members of automobiles.
Description
Technical Field
The invention belongs to the technical field of hot-dip galvanized steel plate production, and particularly relates to a high-strength low-alloy steel hot-dip galvanized steel plate and a production method thereof.
Background
The cold-rolled low-alloy high-strength steel for the automobile has lower cost and still has wide application in the internal structural parts of the automobile.
(1) For example: the Chinese patent application with publication number CN101956125A discloses a flexible manufacturing method of thin-gauge low-alloy high-strength series steel, which adopts simple C-Mn steel base components and realizes the graded control of 345 MPa-550 MPa-level steel with yield strength by controlled rolling and controlled cooling. However, the invention patent is based on a thin slab continuous casting and rolling process, and the final product is a hot rolled product, and a performance grading control method of a cold rolling and annealing process is not provided. Chinese patent application publication No. CN1288269C discloses a method for manufacturing a low-alloy high-strength steel, which comprises the following components (by mass%: 0.06-0.09, Mn: 1.30-1.40, Si: 0.195-0.305, P is less than or equal to 0.015, S is less than or equal to 0.006, V: 0.025-0.035, Nb: 0.015 to 0.025, Ti: 0.010 to 0.020, Al: 0.020-0.035, CaO: 0.0015-0.0045, which is mainly characterized in that the manufacturing method of the smelting process mainly solves the problems of edge corner cracks and steel purity.
(2) Another example is: the Chinese patent application with publication number CN102492823A discloses a continuous annealing process of a cold-rolled low-alloy high-strength steel plate with the yield strength of 420MPa, which mainly solves the problem of setting parameters of the continuous annealing process of the cold-rolled low-alloy high-strength steel with the yield strength of 420 MPa.
(3) For another example: the Chinese patent application with publication number CN103789625A discloses a method for producing microalloyed cold-rolled low-alloy high-strength steel by hood annealing, which comprises the following components: c: 0.05 to 0.10 wt%, Mn: 0.5-1.5 wt%, S is less than or equal to 0.020 wt%, Si is less than or equal to 0.5 wt%, and Nb: 0.01-0.05 wt%, Ti: 0.01 to 0.06wt percent, and combined with the cover annealing process, the comprehensive performance of 462MPa of yield strength, 579MPa of tensile strength and 24 percent of elongation A80 can be obtained. The above patent is limited to a manufacturing method of a strength grade cold rolling low alloy high strength steel, and no control method for solving low cost manufacturing and performance grading is mentioned.
Although the existing method can prepare the hot-dip galvanized steel sheet, the cost for producing the hot-dip galvanized steel sheet is high, the yield strength, the tensile strength and the elongation of the prepared hot-dip galvanized steel sheet are low, and the mechanical property is poor.
Disclosure of Invention
The invention aims to provide a high-strength low-alloy steel hot-dip galvanized steel plate with better mechanical property.
The technical scheme adopted by the invention for solving the technical problems is as follows: the high-strength low-alloy steel hot-dip galvanized steel sheet comprises the following chemical components: c, according to weight percentage: 0.09-0.12%, Si: 0.22-0.60%, Mn: 1.0-1.5%, P: 0.010-0.040%, S: less than or equal to 0.015 percent, Als: 0.020-0.080%, Nb: 0.055-0.080%, and the balance of Fe and inevitable impurities.
Furthermore, the yield strength of the high-strength low-alloy steel hot-dip galvanized steel plate is 440-480 MPa, the tensile strength is 540-600 MPa, and the elongation is more than or equal to 28.0%.
The invention also provides a production method of the high-strength low-alloy steel hot-dip galvanized steel sheet, which is used for preparing the high-strength low-alloy steel hot-dip galvanized steel sheet, and the method has lower production cost and better mechanical property of the prepared hot-dip galvanized steel sheet.
Furthermore, the production method of the high-strength low-alloy steel hot-dip galvanized steel sheet comprises a smelting process, a hot rolling process, an acid rolling process and a hot-dip galvanizing annealing process which are sequentially carried out.
Further, the hot rolling process is to sequentially perform heating, dephosphorization, rough rolling, finish rolling, laminar cooling and coiling on the steel plate blank prepared in the smelting process to obtain a hot rolled coil.
Furthermore, the start rolling temperature of finish rolling in the hot rolling procedure is 1050-1100 ℃, and the finish rolling temperature is 830-860 ℃.
Further, the coiling temperature in the hot rolling process is 655-700 ℃.
Further, the cold rolling reduction rate in the acid rolling process is 50-80%.
Further, the hot galvanizing annealing process comprises the steps of cooling the steel plate blank subjected to laminar cooling from the annealing temperature of 770-800 ℃ to 440-460 ℃ at the speed of 10-50 ℃/s, galvanizing for 7-30 s, and finally cooling to the room temperature at the speed of 5-10 ℃/s.
Furthermore, the finishing elongation in the hot galvanizing annealing procedure is controlled to be 1.0-1.5%.
The invention has the beneficial effects that: according to the high-strength low-alloy steel hot-dip galvanized steel plate, the purity of steel is ensured by strictly controlling C, N and other interstitial atoms, particularly, quantitative component design of Si, Mn and Nb contents is carried out, so that the yield strength of the high-strength low-alloy steel hot-dip galvanized steel plate reaches 440-480 MPa, the tensile strength of the high-strength low-alloy steel hot-dip galvanized steel plate reaches 540-600 MPa, the elongation of the high-strength low-alloy steel hot-dip galvanized steel plate is more than or equal to 28.0%, the high-strength low-alloy steel hot-dip galvanized steel plate has better mechanical properties, the tensile strength and the elongation of the high-strength low-alloy steel hot-dip galvanized steel plate are ensured to meet the use requirements of an automobile outer plate at the same time, and the high-strength low-alloy steel hot-dip galvanized steel plate is particularly suitable for manufacturing structural members of automobiles. According to the production method of the high-strength low-alloy steel hot-dip galvanized steel plate, the technological parameters of all the working procedures are effectively controlled, the hot-dip galvanized steel plate can be produced with lower energy consumption and higher efficiency on the premise of ensuring the mechanical property of the hot-dip galvanized steel plate, and the production cost is reduced.
Detailed Description
The present invention will be further described with reference to the following examples.
The high-strength low-alloy steel hot-dip galvanized steel sheet comprises the following chemical components: c: 0.09-0.12%, Si: 0.22-0.60%, Mn: 1.0-1.5%, P: 0.010-0.040%, S: less than or equal to 0.015 percent, Als: 0.020-0.080%, Nb: 0.055-0.080%, and the balance of Fe and inevitable impurities.
The high-strength low-alloy steel hot-dip galvanized steel plate provided by the invention has the carbon content design mainly considering the matching of strength, formability and welding performance, and if the carbon content is lower than 0.09%, the strength of the steel plate is low, and the high-strength requirement can be met only by adding more other strengthening alloy elements, so that the production is increased. If the carbon content is more than 0.12%, formability and weldability of the steel sheet are deteriorated, and low-strength-level performance control is not facilitated. Therefore, the carbon content is determined to be 0.09 to 0.12%.
Meanwhile, in order to improve the solid solution strengthening effect, purify recrystallized ferrite, promote pearlite transformation and improve the anti-aging performance of test steel, the high-strength low-alloy steel hot-dip galvanized steel plate provided by the invention also contains a small amount of silicon and phosphorus, and the Si content is determined to be 0.22-0.60%, and the P content is determined to be 0.010-0.040%.
Mn can improve the strength in a solid solution strengthening mode in a steel plate and is combined with sulfur to form MnS, so that hot cracks caused by FeS can be prevented, but the welding performance of the steel can be influenced due to the excessively high Mn content; therefore, the manganese content is determined to be 1.0 to 1.5%.
S is used as a residual element, the content of the aluminum is controlled to be below 0.015 percent, the aluminum is mainly added as a deoxidizing element, the content of the aluminum is required to be above 0.010 percent to realize complete deoxidation, but the overhigh aluminum influences the welding performance of steel and the control of casting blank inclusions; therefore, the content of Als is determined to be 0.020 to 0.080%.
In particular, the high-strength low-alloy steel hot-dip galvanized steel sheet provided by the invention also contains microalloy Nb, which can effectively form fine grains by increasing the austenite recrystallization temperature and can be combined with C, N elements to form a Nb (C, N) reinforced ferrite matrix so as to achieve the aim of high strength. According to the strength of the hot-dip galvanized steel sheet prepared by the invention, the added Nb is determined to be 0.055-0.080%.
In conclusion, through the accurate control of various components, the high-strength low-alloy steel hot-dip galvanized steel plate with excellent strength and formability is prepared, the yield strength reaches 440-480 MPa, the tensile strength reaches 540-600 MPa, and the elongation is more than or equal to 28.0%.
The invention also provides a production method of the high-strength low-alloy steel hot-dip galvanized steel sheet, which is used for preparing the high-strength low-alloy steel hot-dip galvanized steel sheet.
The production method of the high-strength low-alloy steel hot-dip galvanized steel plate comprises a smelting process, a hot rolling process, an acid rolling process and a hot-dip galvanizing annealing process which are sequentially carried out.
The hot rolling process is to obtain a hot rolled coil after the steel plate blank prepared in the smelting process is sequentially subjected to heating, dephosphorization, rough rolling, finish rolling, laminar cooling and coiling.
In order to prevent the steel plate blank from generating a skin-warping defect in the hot rolling process and ensure the high-temperature coiling temperature, the finish rolling start temperature in the hot rolling process is controlled to be 1050-1100 ℃, and the finish rolling temperature is controlled to be 830-860 ℃.
In order to obtain a suitable ferrite and pearlite structure, the coiling temperature in the hot rolling step is controlled to be 655 to 700 ℃.
Specifically, the cold rolling reduction rate in the acid rolling process is 50-80%.
In order to ensure the galvanizing quality and improve the efficiency, the hot galvanizing annealing process comprises the steps of cooling the steel plate blank subjected to laminar cooling from the annealing temperature of 770-800 ℃ to 440-460 ℃ at the speed of 10-50 ℃/s, galvanizing for 7-30 s, and finally cooling to the room temperature at the speed of 5-10 ℃/s. The room temperature is 20-25 ℃.
Preferably, the finishing elongation in the hot galvanizing annealing process is controlled to be 1.0-1.5%.
The following examples and comparative examples further illustrate specific embodiments of the present invention, but are not intended to limit the scope of the present invention to the examples.
Examples and comparative examples
Examples 1 and 2 are high strength low alloy steel hot-dip galvanized steel sheets prepared by the method of the present invention, and comparative examples 1 and 2 are hot-dip galvanized steel sheets prepared by the conventional method.
The specific operation steps are as follows:
(1) through the smelting process, steel slabs with chemical compositions shown in the following table 1 are prepared:
table 1: chemical composition of Steel slab (wt.%)
| Numbering | C | Si | Mn | P | S | Als | Nb |
| Example 1 | 0.09 | 0.39 | 1.3 | 0.02 | 0.012 | 0.057 | 0.058 |
| Example 2 | 0.11 | 0.35 | 1.2 | 0.02 | 0.013 | 0.056 | 0.055 |
| Comparative example 1 | 0.08 | 0.32 | 1.06 | 0.016 | 0.004 | 0.048 | 0.045 |
| Comparative example 2 | 0.06 | 0.46 | 1.25 | 0.025 | 0.008 | 0.059 | 0.065 |
；
(2) A hot rolling procedure: sequentially carrying out heating, dephosphorization, rough rolling, finish rolling, laminar cooling and coiling on a steel plate blank prepared in the smelting process to obtain a hot rolled coil; the process parameters in the hot rolling process are set as shown in the following table 2:
table 2: main process parameters of hot rolling
(3) Acid rolling process: pickling the hot rolled coil, and cold rolling the hot rolled coil into thin strip steel; wherein, the cold rolling reduction of the example 1 and the comparative example 1 is 55.6%, and the cold rolling reduction of the example 2 and the comparative example 2 is 62.5%;
(4) hot galvanizing annealing: hot galvanizing and annealing are carried out on the thin strip steel obtained in the acid rolling process, and the parameters of the hot galvanizing annealing process are shown in the table 3:
table 3: main technological parameters of hot galvanizing annealing
(5) The mechanical properties of the hot-dip galvanized steel sheet prepared by the process are shown in the following table 4:
table 4: mechanical properties of hot-dip galvanized steel sheet
From the results of examples 1 and 2 and comparative examples 1 and 2, it can be seen that: the hot-dip galvanized steel sheet prepared by the method has good mechanical properties, and has the yield strength of 440-480 MPa, the tensile strength of 540-600 MPa and the elongation rate of more than or equal to 28.0%. Therefore, the invention realizes the whole-flow production process technology of the hot-dip galvanized steel sheet through reasonable components, process design and stable process control; the finished product has excellent surface quality and performance and can meet the use requirements of the outer plate of the passenger car. The production method can be popularized and applied in a continuous annealing production line.
Claims (10)
1. The high-strength low-alloy steel hot-dip galvanized steel sheet is characterized by comprising the following chemical components: c, according to weight percentage: 0.09-0.12%, Si: 0.22-0.60%, Mn: 1.0-1.5%, P: 0.010-0.040%, S: less than or equal to 0.015 percent, Als: 0.020 to 0.080%, Nb: 0.055-0.080%, and the balance of Fe and unavoidable impurities.
2. The high-strength low-alloy steel hot-dip galvanized steel sheet according to claim 1, characterized in that: the yield strength of the high-strength low-alloy steel hot-dip galvanized steel plate is 440-480 MPa, the tensile strength is 540-600 MPa, and the elongation is more than or equal to 28.0%.
3. The production method of the high-strength low-alloy steel hot-dip galvanized steel plate is characterized by comprising the following steps of: used for manufacturing the high-strength low-alloy steel hot-dip galvanized steel sheet according to claim 1 or 2.
4. The method for producing a high-strength low-alloy steel hot-dip galvanized steel sheet according to claim 3, characterized by comprising: comprises a smelting process, a hot rolling process, an acid rolling process and a hot galvanizing annealing process which are sequentially carried out.
5. The method for producing a high-strength low-alloy steel hot-dip galvanized steel sheet according to claim 4, characterized by comprising: the hot rolling process is to obtain a hot rolled coil after the steel plate blank prepared in the smelting process is sequentially subjected to heating, dephosphorization, rough rolling, finish rolling, laminar cooling and coiling.
6. The method for producing a high-strength low-alloy steel hot-dip galvanized steel sheet according to claim 5, characterized by comprising: in the hot rolling procedure, the initial rolling temperature of finish rolling is 1050-1100 ℃, and the final rolling temperature is 830-860 ℃.
7. The method for producing a high-strength low-alloy steel hot-dip galvanized steel sheet according to claim 5, characterized by comprising: and the coiling temperature in the hot rolling procedure is 655-700 ℃.
8. The method for producing a high-strength low-alloy steel hot-dip galvanized steel sheet according to claim 4, characterized by comprising: the cold rolling reduction rate in the acid rolling process is 50-80%.
9. The method for producing a high-strength low-alloy steel hot-dip galvanized steel sheet according to any one of claims 4 to 8, characterized by comprising: the hot galvanizing annealing process is to cool the steel plate blank after laminar cooling from the annealing temperature of 770-800 ℃ to 440-460 ℃ at the speed of 10-50 ℃/s, galvanize for 7-30 s, and finally cool the steel plate blank to the room temperature at the speed of 5-10 ℃/s.
10. The method for producing a high-strength low-alloy steel hot-dip galvanized steel sheet according to claim 9, characterized by comprising: the finishing elongation in the hot galvanizing annealing procedure is controlled to be 1.0-1.5%.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090071157A (en) * | 2007-12-27 | 2009-07-01 | 주식회사 포스코 | High strength high and high yield ratio cold rolled steel sheet and galvanized steel sheet having excellent weldability and manufacturing method thereof |
| CN107739979A (en) * | 2017-10-23 | 2018-02-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-cost high-strength hot-dip galvanizing sheet steel and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20090071157A (en) * | 2007-12-27 | 2009-07-01 | 주식회사 포스코 | High strength high and high yield ratio cold rolled steel sheet and galvanized steel sheet having excellent weldability and manufacturing method thereof |
| CN107739979A (en) * | 2017-10-23 | 2018-02-27 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-cost high-strength hot-dip galvanizing sheet steel and preparation method thereof |
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