CN113046649A - Steel for large heat input welding ship structure and manufacturing method thereof - Google Patents
Steel for large heat input welding ship structure and manufacturing method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 43
- 239000010959 steel Substances 0.000 title claims abstract description 43
- 238000003466 welding Methods 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 14
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 12
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 12
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 12
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 12
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 12
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 12
- 238000005096 rolling process Methods 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 12
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 21
- 238000005266 casting Methods 0.000 claims description 17
- 238000003723 Smelting Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000005496 tempering Methods 0.000 claims description 6
- 238000009489 vacuum treatment Methods 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 5
- 230000003009 desulfurizing effect Effects 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 3
- 238000005275 alloying Methods 0.000 abstract description 2
- 239000011777 magnesium Substances 0.000 description 9
- 239000011572 manganese Substances 0.000 description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- CADICXFYUNYKGD-UHFFFAOYSA-N sulfanylidenemanganese Chemical compound [Mn]=S CADICXFYUNYKGD-UHFFFAOYSA-N 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- 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
-
- 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
- C21D8/0247—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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
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Abstract
The invention discloses steel for a large heat input welding ship body structure and a manufacturing method thereof, relating to the technical field of steel production, wherein the steel comprises the following chemical components in percentage by mass: c: 0.05-0.08%, Si: 0.10-0.30%, Mn: 1.20-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.0030%, Nb: 0.010% -0.030%, V: 0.020-0.040%, Ti: 0.006-0.020%, Cr is less than or equal to 0.10%, Mo is less than or equal to 0.10%, Ni: 0.10-0.20%, Al: 0.005-0.015%, Mg: 0.0008 to 0.0015 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities. Pure molten steel of nano-scale oxides is obtained by adopting a micro-alloying process, and a steel plate mainly comprising acicular ferrite is obtained by a rolling cooling process, so that the requirement of large-line energy welding of products is met.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to steel for a large heat input welding ship body structure and a manufacturing method thereof.
Background
With the continuous development of economy, the export volume of China is increasing day by day, the ship transportation volume is larger and larger, the tonnage of shipbuilding is also larger and larger, the steel plate grade, thickness and quality requirements required by shipbuilding are higher and higher, wherein, the ship plate with high grade thick wall specification needs larger welding energy in the welding process to meet the welding requirement.
The thick-wall ship plate product needs thick-wall casting blank manufacturing, in the smelting process, the control difficulty of the inclusions in the thick-wall casting blank is high, the core segregation of the casting blank is serious, a large amount of aluminum oxide inclusions and manganese sulfide inclusions are easily generated, in the welding process, a heat affected zone and a welding zone can cause secondary aggregation of oxides, the performance of the heat affected zone and the welding zone is large in difference with the regional performance of a steel plate body, the regional performance difference of the ship plate can be caused, and the use performance of the ship body is influenced.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides steel for a large heat input welding ship structure, which comprises the following chemical components in percentage by mass: c: 0.05-0.08%, Si: 0.10-0.30%, Mn: 1.20-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.0030%, Nb: 0.010% -0.030%, V: 0.020-0.040%, Ti: 0.006-0.020%, Cr is less than or equal to 0.10%, Mo is less than or equal to 0.10%, Ni: 0.10-0.20%, Al: 0.005-0.015%, Mg: 0.0008 to 0.0015 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities.
The technical scheme of the invention is further defined as follows:
the steel for the large heat input welding ship structure comprises the following chemical components in percentage by mass: c: 0.05 to 0.07 percent, Si: 0.10-0.20%, Mn: 1.20-1.30%, P is less than or equal to 0.013%, S is less than or equal to 0.0020%, Nb: 0.010% -0.020%, V: 0.020-0.030%, Ti: 0.010-0.020%, Cr is less than or equal to 0.10%, Mo is less than or equal to 0.10%, Ni: 0.10-0.15%, Al: 0.006-0.015%, Mg: 0.0009 to 0.0015 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities.
The steel for the large heat input welding ship structure comprises the following chemical components in percentage by mass: c: 0.055% -0.075%, Si: 0.15-0.25%, Mn: 1.30-1.40%, P is less than or equal to 0.012%, S is less than or equal to 0.0020%, Nb: 0.015% -0.025%, V: 0.025-0.035%, Ti: 0.006-0.019%, Cr is less than or equal to 0.10%, Mo is less than or equal to 0.10%, and Ni: 0.13-0.18%, Al: 0.005-0.013%, Mg: 0.0008 to 0.0013 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities.
The steel for the large heat input welding ship structure comprises the following chemical components in percentage by mass: c: 0.06% -0.08%, Si: 0.20-0.30%, Mn: 1.40-1.50%, P is less than or equal to 0.010%, S is less than or equal to 0.0010%, Nb: 0.020% -0.030%, V: 0.030-0.040%, Ti: 0.010-0.020%, Cr is less than or equal to 0.10%, Mo is less than or equal to 0.10%, Ni: 0.12-0.20%, Al: 0.006-0.015%, Mg: 0.0009 to 0.0015 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities.
Another object of the present invention is to provide a method for manufacturing a steel for a high heat input welding ship hull structure, comprising the steps of:
s1, desulfurizing molten iron, blowing in a converter, LF smelting, RH vacuum treatment and CCM casting;
s2, heating the casting blank by a stepping heating furnace, and then rolling, wherein the second starting temperature is 800-900 ℃, the final rolling temperature is 750-850 ℃, the water inlet temperature is 750-800 ℃, and the re-reddening temperature is 550-650 ℃;
s3, tempering the steel plate for 20min at 200-300 ℃, and air-cooling to room temperature.
According to the manufacturing method of the steel for the large heat input welding ship body structure, the steel grade of the steel plate is DH36, the thickness is 30-100 mm, and large heat input welding is adopted.
The invention has the beneficial effects that:
(1) according to the invention, a magnesium microalloying technology is adopted, and the inclusions are effectively modified through vacuum treatment, so that most of nano-scale micro inclusions smaller than 10 mu m are formed in a casting blank, the nano-scale micro inclusions become nucleation quality for structure transformation again in the welding process, and a structure type mainly comprising acicular ferrite is formed in the cooling process, so that the purity of molten steel is effectively improved, and the product performance is effectively improved;
(2) the invention adopts the magnesium alloying technology, reduces the harm of sulfur in steel, effectively spheroidizes A-type inclusions, and improves the internal quality of the steel;
(3) the invention adopts tempering treatment, eliminates the internal stress of the steel plate and is more beneficial to the use of the steel of the ship plate structure.
Drawings
FIG. 1 is a metallographic structure diagram of example 1 of the present invention.
Detailed Description
Example 1
The steel for the large heat input welding ship structure provided by the embodiment has the thickness of 35mm, and comprises the following chemical components in percentage by mass: c: 0.063%, Si: 0.12%, Mn: 1.23%, P: 0.011%, S: 0.0015%, Nb: 0.018%, V: 0.023%, Ti: 0.016%, Cr: 0.05%, Mo: 0.009%, Ni: 0.13%, Al: 0.011%, Mg: 0.0013%, N: 0.0031% and no Ca, the balance being Fe and unavoidable impurities.
The manufacturing method comprises the following steps:
s1, desulfurizing molten iron, blowing in a converter, LF smelting, RH vacuum treatment and CCM casting, wherein the components of a smelting casting blank meet the requirements;
s2, heating the casting blank by a stepping heating furnace, and then rolling, wherein the secondary opening temperature is 886 ℃, the final rolling temperature is 819 ℃, the water inlet temperature is 785 ℃, and the re-reddening temperature is 631 ℃;
s3, tempering the steel plate for 20min at 283 ℃, and air-cooling to room temperature.
Example 2
The steel for the large heat input welding ship structure provided by the embodiment has the thickness of 56mm, and comprises the following chemical components in percentage by mass: c: 0.069%, Si: 0.17%, Mn: 1.36%, P: 0.010%, S: 0.0011%, Nb: 0.019%, V: 0.029%, Ti: 0.017%, Cr: 0.03%, Mo: 0.010%, Ni: 0.16%, Al: 0.010%, Mg: 0.0009%, N: 0.0040% and no Ca, the balance being Fe and unavoidable impurities.
The manufacturing method comprises the following steps:
s1, desulfurizing molten iron, blowing in a converter, LF smelting, RH vacuum treatment and CCM casting, wherein the components of a smelting casting blank meet the requirements;
s2, heating the casting blank by a stepping heating furnace, and then rolling, wherein the secondary opening temperature is 866 ℃, the final rolling temperature is 778 ℃, the water inlet temperature is 765 ℃, and the re-reddening temperature is 593 ℃;
s3, tempering the steel plate for 20min at 232 ℃, and air-cooling to room temperature.
Example 3
The steel for the large heat input welding ship structure provided by the embodiment has the thickness of 90mm, and comprises the following chemical components in percentage by mass: c: 0.078%, Si: 0.29%, Mn: 1.47%, P: 0.009%, S: 0.0008%, Nb: 0.027%, V: 0.033%, Ti: 0.019%, Cr: 0.03%, Mo: 0.008%, Ni: 0.19%, Al: 0.013%, Mg: 0.0014%, N: 0.0029% and no Ca, the balance being Fe and unavoidable impurities.
The manufacturing method comprises the following steps:
s1, desulfurizing molten iron, blowing in a converter, LF smelting, RH vacuum treatment and CCM casting, wherein the components of a smelting casting blank meet the requirements;
s2, heating the casting blank by a walking beam furnace, and then rolling, wherein the secondary opening temperature is 818 ℃, the final rolling temperature is 779 ℃, the water inlet temperature is 751 ℃, and the re-reddening temperature is 550 ℃;
s3, tempering the steel plate at 267 ℃ for 20min, and air-cooling to room temperature.
The results of the mechanical property tests of the products of example 1, example 2 and example 3 are shown in the following table:
in conclusion, the steel plate of the invention adopts the microalloying process to obtain pure molten steel of nano-scale oxides, and the steel plate mainly comprising acicular ferrite is obtained through the rolling and cooling process, thereby meeting the requirements of large-line energy welding of products and customers.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. A steel for a large heat input welding ship structure is characterized in that: the chemical components and the mass percentage are as follows: c: 0.05-0.08%, Si: 0.10-0.30%, Mn: 1.20-1.50%, P is less than or equal to 0.015%, S is less than or equal to 0.0030%, Nb: 0.010% -0.030%, V: 0.020-0.040%, Ti: 0.006-0.020%, Cr is less than or equal to 0.10%, Mo is less than or equal to 0.10%, Ni: 0.10-0.20%, Al: 0.005-0.015%, Mg: 0.0008 to 0.0015 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities.
2. The steel for high heat input welding ship hull structure according to claim 1, characterized in that: the chemical components and the mass percentage are as follows: c: 0.05 to 0.07 percent, Si: 0.10-0.20%, Mn: 1.20-1.30%, P is less than or equal to 0.013%, S is less than or equal to 0.0020%, Nb: 0.010% -0.020%, V: 0.020-0.030%, Ti: 0.010-0.020%, Cr is less than or equal to 0.10%, Mo is less than or equal to 0.10%, Ni: 0.10-0.15%, Al: 0.006-0.015%, Mg: 0.0009 to 0.0015 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities.
3. The steel for high heat input welding ship hull structure according to claim 1, characterized in that: the chemical components and the mass percentage are as follows: c: 0.055% -0.075%, Si: 0.15-0.25%, Mn: 1.30-1.40%, P is less than or equal to 0.012%, S is less than or equal to 0.0020%, Nb: 0.015% -0.025%, V: 0.025-0.035%, Ti: 0.006-0.019%, Cr is less than or equal to 0.10%, Mo is less than or equal to 0.10%, and Ni: 0.13-0.18%, Al: 0.005-0.013%, Mg: 0.0008 to 0.0013 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities.
4. The steel for high heat input welding ship hull structure according to claim 1, characterized in that: the chemical components and the mass percentage are as follows: c: 0.06% -0.08%, Si: 0.20-0.30%, Mn: 1.40-1.50%, P is less than or equal to 0.010%, S is less than or equal to 0.0010%, Nb: 0.020% -0.030%, V: 0.030-0.040%, Ti: 0.010-0.020%, Cr is less than or equal to 0.10%, Mo is less than or equal to 0.10%, Ni: 0.12-0.20%, Al: 0.006-0.015%, Mg: 0.0009 to 0.0015 percent, less than or equal to 0.0050 percent of N, no Ca, and the balance of Fe and inevitable impurities.
5. A method for manufacturing steel for a large heat input welding ship structure is characterized in that: application to any of claims 1-4, comprising the steps of:
s1, desulfurizing molten iron, blowing in a converter, LF smelting, RH vacuum treatment and CCM casting;
s2, heating the casting blank by a stepping heating furnace, and then rolling, wherein the second starting temperature is 800-900 ℃, the final rolling temperature is 750-850 ℃, the water inlet temperature is 750-800 ℃, and the re-reddening temperature is 550-650 ℃;
s3, tempering the steel plate for 20min at 200-300 ℃, and air-cooling to room temperature.
6. The method for manufacturing a steel for high heat input welding ship hull structures according to claim 5, characterized in that: the steel grade of the steel plate is DH36, the thickness is 30-100 mm, and high heat input welding is adopted.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114411044A (en) * | 2022-01-19 | 2022-04-29 | 南京钢铁股份有限公司 | Method for manufacturing steel for pressure vessel with low welding crack sensitivity |
| WO2024221702A1 (en) * | 2023-04-26 | 2024-10-31 | 南京钢铁股份有限公司 | Ship plate for luxury cruise ship, and production method for ship plate |
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-
2021
- 2021-03-10 CN CN202110259689.XA patent/CN113046649A/en active Pending
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|---|---|---|---|---|
| JPH11193438A (en) * | 1997-12-26 | 1999-07-21 | Nippon Steel Corp | Steel plate for hull with excellent shock absorption capacity |
| JP2007177299A (en) * | 2005-12-28 | 2007-07-12 | Kobe Steel Ltd | Steel material superior in corrosion resistance and brittle fracture initiation property for ship |
| CN102482751A (en) * | 2009-11-20 | 2012-05-30 | 新日本制铁株式会社 | Thick steel plate for ship hull and process for production thereof |
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| CN111440986A (en) * | 2020-04-22 | 2020-07-24 | 河钢股份有限公司 | High heat input welding EH460 grade ship plate steel and preparation method thereof |
| CN111926259A (en) * | 2020-08-20 | 2020-11-13 | 钢铁研究总院 | Low alloy steel for high heat input welding and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114411044A (en) * | 2022-01-19 | 2022-04-29 | 南京钢铁股份有限公司 | Method for manufacturing steel for pressure vessel with low welding crack sensitivity |
| WO2024221702A1 (en) * | 2023-04-26 | 2024-10-31 | 南京钢铁股份有限公司 | Ship plate for luxury cruise ship, and production method for ship plate |
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