CN113249638A - Manufacturing method of thick-wall high-strength ship plate steel for high heat input welding - Google Patents

Manufacturing method of thick-wall high-strength ship plate steel for high heat input welding Download PDF

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CN113249638A
CN113249638A CN202110457567.1A CN202110457567A CN113249638A CN 113249638 A CN113249638 A CN 113249638A CN 202110457567 A CN202110457567 A CN 202110457567A CN 113249638 A CN113249638 A CN 113249638A
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吴俊平
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
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    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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    • 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
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    • 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
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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    • 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
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    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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    • C22C—ALLOYS
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    • 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
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
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Abstract

The invention discloses a method for manufacturing thick-wall high-strength ship plate steel for large heat input welding, which relates to the technical field of steel production, wherein a converter and RH vacuum treatment are adopted through a magnesium metallurgy technology to obtain a high-cleanliness smelting blank, a high-pressure rolling deformation technology is carried out below a recrystallization temperature according to a metallurgy principle technology, the effective control of austenite grain growth by depending on magnesium metallurgy is realized, a thick-wall high-strength ship plate with fine grains and excellent performance is obtained by matching a rapid cooling process after rolling, the yield strength is 400-600 MPa, and the large heat input welding requirement is met.

Description

Manufacturing method of thick-wall high-strength ship plate steel for high heat input welding
Technical Field
The invention relates to the technical field of steel production, in particular to a method for manufacturing thick-wall high-strength ship plate steel for large heat input welding.
Background
With the economic development, the shipbuilding technology in China has been rapidly advanced, and has become the world shipbuilding big country, and the steel amount of the ship plate in China is stable in the world first. The shipbuilding level of a ship enterprise is rapidly developed, the requirement on the quality of shipbuilding steel is higher and higher, the rapid development of the ship plate manufacturing industry in China is promoted, the development of steel with high technical requirement and high added value is more prominent, and a thick-wall high-strength steel plate with excellent welding performance by adopting a TMCP rolling technology is developed at a high speed.
In the process of welding the steel plates, the thick-wall high-strength steel needs to be welded by large heat input to ensure the welding quality, the large heat input welding temperature is high, the heat value of a hot area is high, and the welding and heat affected areas can weaken the strength. At present, a calcium treatment process is generally adopted in steel mills, calcium aluminate inclusions are easily generated, and the inclusions are continuously expanded in the welding process, so that the strength of a welding area is reduced, and flaw detection is unqualified.
Disclosure of Invention
The invention aims at the technical problems, overcomes the defects of the prior art, and provides a method for manufacturing thick-wall high-strength ship plate steel for high heat input welding, which comprises the following steps:
s1, smelting molten steel by adopting a converter or an electric furnace, refining by LF and RH, feeding a magnesium-aluminum wire after vacuum deoxidation, wherein the magnesium content is 0.0020-0.0040%, and statically stirring for 15min after the magnesium treatment is finished;
s2, adopting a breathable water gap for continuous casting to ensure smooth casting, wherein the superheat degree meets 15-35 ℃, and adopting an electromagnetic stirring and dynamic soft reduction process;
s3, carrying out austenitizing heating after the surface of the blank is qualified, wherein the heating temperature is 1150 +/-30 ℃, and the soaking time is more than 40 min;
s4, adopting a TMCP rolling process, wherein the secondary opening temperature is 780-880 ℃, the final rolling temperature is 760-830 ℃, the water inlet temperature is 750-800 ℃, and the re-reddening temperature is 500-600 ℃;
and S5, after the steel plate is discharged from the ACC, stacking and cooling for 12h, marking after shearing, detecting defects, and warehousing for delivery processing.
The technical effects are as follows: according to the invention, a converter and RH vacuum treatment are adopted by a magnesium metallurgy technology to obtain a high-cleanliness smelting blank, a rolling deformation technology is carried out under a high pressure below a recrystallization temperature according to a metallurgy principle technology, the growth of austenite grains is effectively controlled by a microalloy by depending on magnesium metallurgy, a thick-wall high-strength ship plate with fine grains and excellent performance is obtained by matching with a post-rolling rapid cooling process, the yield strength is between 400 and 600MPa, and the requirement of high-linear energy welding is met. Compared with the traditional production process, the method has the advantages of low production cost, low energy consumption, economic alloy demand, refined microstructure, high impact toughness, good surface quality, low carbon equivalent, good welding performance, no preheating before welding, no heat treatment after welding and the like during ship construction.
The technical scheme of the invention is further defined as follows:
the method for manufacturing the steel for the thick-wall high-strength ship plate for the high heat input welding comprises the following steps of:
s1, smelting molten steel by adopting a converter or an electric furnace, refining by LF and RH, feeding a magnesium-aluminum wire after vacuum deoxidation, wherein the magnesium content is 0.0020-0.0040%, and statically stirring for 15min after the magnesium treatment is finished;
s2, adopting a breathable water gap for continuous casting to ensure smooth casting, wherein the superheat degree meets 23-35 ℃, and adopting an electromagnetic stirring and dynamic soft reduction process;
s3, carrying out austenitizing heating after the surface of the blank is qualified, wherein the heating temperature is 1150 +/-30 ℃, and the soaking time is more than 40 min;
s4, adopting a TMCP rolling process, wherein the secondary opening temperature is 820-860 ℃, the final rolling temperature is 783-813 ℃, the water inlet temperature is 772-796 ℃, and the re-reddening temperature is 536-593 ℃;
and S5, after the steel plate is discharged from the ACC, stacking and cooling for 12h, marking after shearing, detecting defects, and warehousing for delivery processing.
The manufacturing method of the steel for the thick-wall high-strength ship plate for the high heat input welding comprises the following chemical components in percentage by mass:
c: 0.05% -0.09%, Si: 0.10-0.30%, Mn: 1.50-1.70%, P is less than or equal to 0.010%, S is less than or equal to 0.0030%, Nb: 0.020% -0.040%, V: 0.020-0.040%, Ti: 0.008-0.020%, Cr: 0.10% -0.30%, Ni: 0.30-0.45%, Mo is less than or equal to 0.10%, Cu: 0.20-0.30%, B is less than or equal to 0.00050%, Al: 0.020% -0.050%, Mg: 0.0010 to 0.0030 percent, less than or equal to 0.0050 percent of N, less than or equal to 0.00030 percent of H, less than or equal to 0.010 percent of As, less than or equal to 0.010 percent of Sn, less than or equal to 0.010 percent of Sb, less than or equal to 0.010 percent of Bi, less than or equal to 0.010 percent of Pb, no Ca and the balance of Fe and impurities.
The manufacturing method of the steel for the thick-wall high-strength ship plate for the high heat input welding comprises the following chemical components in percentage by mass:
c: 0.05 to 0.07 percent, Si: 0.10-0.20%, Mn: 1.50-1.60%, P is less than or equal to 0.010%, S is less than or equal to 0.0030%, Nb: 0.020% -0.030%, V: 0.020-0.030%, Ti: 0.008-0.018%, Cr: 0.10% -0.20%, Ni: 0.30-0.40%, Mo is less than or equal to 0.10%, Cu: 0.20-0.25%, B is less than or equal to 0.00050%, Al: 0.020-0.040%, Mg: 0.0010 to 0.0020 percent, less than or equal to 0.0050 percent of N, less than or equal to 0.00030 percent of H, less than or equal to 0.010 percent of As, less than or equal to 0.010 percent of Sn, less than or equal to 0.010 percent of Sb, less than or equal to 0.010 percent of Bi, less than or equal to 0.010 percent of Pb, no Ca and the balance of Fe and impurities.
The manufacturing method of the steel for the thick-wall high-strength ship plate for the high heat input welding comprises the following chemical components in percentage by mass:
c: 0.06% -0.08%, Si: 0.15-0.25%, Mn: 1.55 to 1.65 percent of the total weight of the alloy, less than or equal to 0.010 percent of P, less than or equal to 0.0030 percent of S, and Nb: 0.025-0.035%, V: 0.025-0.035%, Ti: 0.010-0.020%, Cr: 0.15% -0.25%, Ni: 0.35-0.45%, Mo is less than or equal to 0.10%, Cu: 0.22-0.28%, B is less than or equal to 0.00050%, Al: 0.025-0.050%, Mg: 0.0012 to 0.0030 percent, less than or equal to 0.0050 percent of N, less than or equal to 0.00030 percent of H, less than or equal to 0.010 percent of As, less than or equal to 0.010 percent of Sn, less than or equal to 0.010 percent of Sb, less than or equal to 0.010 percent of Bi, less than or equal to 0.010 percent of Pb, no Ca and the balance of Fe and impurities.
The manufacturing method of the steel for the thick-wall high-strength ship plate for the high heat input welding comprises the following chemical components in percentage by mass:
c: 0.07% -0.09%, Si: 0.20-0.30%, Mn: 1.60-1.70%, P is less than or equal to 0.008%, S is less than or equal to 0.0020%, Nb: 0.030-0.040%, V: 0.030-0.040%, Ti: 0.010-0.020%, Cr: 0.20-0.30%, Ni: 0.35-0.45%, Mo is less than or equal to 0.10%, Cu: 0.25-0.30%, B is less than or equal to 0.00050%, Al: 0.025% -0.045%, Mg: 0.0010 to 0.0030 percent, less than or equal to 0.0050 percent of N, less than or equal to 0.00030 percent of H, less than or equal to 0.010 percent of As, less than or equal to 0.010 percent of Sn, less than or equal to 0.010 percent of Sb, less than or equal to 0.010 percent of Bi, less than or equal to 0.010 percent of Pb, no Ca and the balance of Fe and impurities.
The steel plate has the specification of 60-120mm and the structure of ferrite and bainite.
The invention has the beneficial effects that:
(1) the invention adopts the low-carbon high-manganese design, and simultaneously adds niobium, vanadium and titanium alloy, thereby not only increasing the ferrite content of the product, but also effectively refining the structure grain size and improving the welding performance stability of the thick-wall high-strength product;
(2) according to the invention, through the component design of active elements such as magnesium, aluminum, calcium and the like, the modification effect of magnesium element on inclusions is effectively exerted, fine solid inclusions of magnesium oxide, magnesium sulfide and magnesia-alumina spinel are generated, the fine inclusions become austenitizing nucleation particles, the growth of crystal grains is prevented by the fine particles after welding and hot melting, and the strength loss caused by welding is avoided;
(3) according to the invention, the rolling deformation technology is carried out at a high reduction pressure below the recrystallization temperature, and magnesium inclusion particles are matched, so that the original austenitizing grain size is effectively reduced, the toughness and strength of the product are improved, and the weldability of the product with high linear energy is improved;
(4) the invention adopts a rolling cooling process, fully exerts the tissue phase transition energy, promotes the generation of a large amount of bainite through rapid cooling after rolling, weakens the adverse effect of the central banding of the steel plate, and has a positive effect on the welding of the steel plate;
(5) the invention adopts a short process to manufacture products with high added value, effectively reduces the manufacturing cost of the products and greatly improves the market competitiveness of the products.
Drawings
FIG. 1 is a metallographic structure diagram of example 1 of the present invention.
Detailed Description
Example 1
In the method for manufacturing the thick-walled high-strength ship plate steel for high heat input welding provided in the embodiment, the chemical components and mass percentages of the steel plate are as follows:
c: 0.065%, Si: 0.15%, Mn: 1.55%, P: 0.006%, S: 0.0013%, Nb: 0.023%, V: 0.026%, Ti: 0.013%, Cr: 0.12%, Ni: 0.33%, Mo: 0.03%, Cu: 0.23%, B: 0.00010%, Al: 0.029%, Mg: 0.0016%, N: 0.0031%, H: 0.00012%, As: 0.004%, Sn: 0.002%, Sb: 0.001%, Bi: 0.003%, Pb: 0.0001%, Ca is not added, and the balance is Fe and impurities.
The manufacturing method of the steel plate comprises the following steps:
s1, smelting molten steel by adopting a converter or an electric furnace, refining by LF and RH, feeding a magnesium-aluminum wire after vacuum deoxidation, wherein the magnesium content is 0.0031 percent, and standing and stirring for 15min after the magnesium treatment is finished;
s2, adopting a ventilating water gap for continuous casting to ensure smooth casting, wherein the superheat degree meets 23 ℃, and adopting an electromagnetic stirring and dynamic soft reduction process;
s3, carrying out austenitizing heating after the surface of the blank is qualified, wherein the heating temperature is 1153 ℃, and the soaking time is more than 40 min;
s4, adopting a TMCP rolling process, wherein the second opening temperature is 860 ℃, the final rolling temperature is 813 ℃, the water inlet temperature is 796 ℃, and the red returning temperature is 593 ℃;
and S5, after the steel plate is discharged from the ACC, stacking and cooling for 12h, marking after shearing, detecting defects, and warehousing for delivery processing.
Example 2
The method for manufacturing the thick-walled high-strength ship plate steel for the high heat input welding, which is provided by the embodiment, is different from the embodiment 1 in that the chemical components and the mass percentages of the steel plate are as follows:
c: 0.066%, Si: 0.19%, Mn: 1.59%, P: 0.007%, S: 0.0012%, Nb: 0.029%, V: 0.027%, Ti: 0.016%, Cr: 0.19%, Ni: 0.37%, Mo: 0.03%, Cu: 0.23%, B: 0.00020%, Al: 0.029%, Mg: 0.0016%, N: 0.0041%, H: 0.00011%, As: 0.002%, Sn: 0.0016%, Sb: 0.0012%, Bi: 0.0001%, Pb: 0.00005%, no Ca, and the balance of Fe and impurities.
Example 3
The method for manufacturing the thick-walled high-strength ship plate steel for the high heat input welding, which is provided by the embodiment, is different from the embodiment 1 in that the chemical components and the mass percentages of the steel plate are as follows:
c: 0.079%, Si: 0.28%, Mn: 1.69%, P: 0.005%, S: 0.0011%, Nb: 0.039%, V: 0.039%, Ti: 0.016%, Cr: 0.26%, Ni: 0.38%, Mo: 0.03%, Cu: 0.29%, B: 0.00030%, Al: 0.037%, Mg: 0.0027%, N: 0.0043%, H: 0.00021%, As: 0.0055%, Sn: 0.0022%, Sb: 0.002%, Bi: 0.0001%, Pb: 0.00009%, no Ca, and the balance of Fe and impurities.
The physical and chemical detection of the materials is carried out according to the requirements of classification society standards such as ABS, BV, DNV, KR, NK, RS, CCS, India and the like, and the mechanical property test results of the steel plates of example 1, example 2 and example 3 are as follows:
Figure BDA0003041082710000041
Figure BDA0003041082710000051
according to the invention, through a metallurgical technology or cleaner molten steel and the addition of magnesium, the form of oxide inclusions is changed, finer and uniform particle inclusions are obtained, nucleation particles of austenite are improved, and a steel plate structure of ferrite and bainite is obtained, as shown in figure 1. The crystal grains are finer after welding and thermalization, the welding performance of the product is improved, the large heat input welding requirement of a thick-wall high-strength ship plate is met, and the market competitiveness of an enterprise is improved. The invention is not only suitable for the requirements of thick-wall high-strength steel, but also suitable for the field of manufacturing of other B-F grade thin-specification 30-50mm series ship plate steel.
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 (7)

1. A method for manufacturing thick-wall high-strength ship plate steel for high heat input welding is characterized by comprising the following steps: the method comprises the following steps:
s1, smelting molten steel by adopting a converter or an electric furnace, refining by LF and RH, feeding a magnesium-aluminum wire after vacuum deoxidation, wherein the magnesium content is 0.0020-0.0040%, and statically stirring for 15min after the magnesium treatment is finished;
s2, adopting a breathable water gap for continuous casting to ensure smooth casting, wherein the superheat degree meets 15-35 ℃, and adopting an electromagnetic stirring and dynamic soft reduction process;
s3, carrying out austenitizing heating after the surface of the blank is qualified, wherein the heating temperature is 1150 +/-30 ℃, and the soaking time is more than 40 min;
s4, adopting a TMCP rolling process, wherein the secondary opening temperature is 780-880 ℃, the final rolling temperature is 760-830 ℃, the water inlet temperature is 750-800 ℃, and the re-reddening temperature is 500-600 ℃;
and S5, after the steel plate is discharged from the ACC, stacking and cooling for 12h, marking after shearing, detecting defects, and warehousing for delivery processing.
2. The method for manufacturing a thick-walled high-strength ship plate steel for high heat input welding according to claim 1, wherein: the method comprises the following steps:
s1, smelting molten steel by adopting a converter or an electric furnace, refining by LF and RH, feeding a magnesium-aluminum wire after vacuum deoxidation, wherein the magnesium content is 0.0020-0.0040%, and statically stirring for 15min after the magnesium treatment is finished;
s2, adopting a breathable water gap for continuous casting to ensure smooth casting, wherein the superheat degree meets 23-35 ℃, and adopting an electromagnetic stirring and dynamic soft reduction process;
s3, carrying out austenitizing heating after the surface of the blank is qualified, wherein the heating temperature is 1150 +/-30 ℃, and the soaking time is more than 40 min;
s4, adopting a TMCP rolling process, wherein the secondary opening temperature is 820-860 ℃, the final rolling temperature is 783-813 ℃, the water inlet temperature is 772-796 ℃, and the re-reddening temperature is 536-593 ℃;
and S5, after the steel plate is discharged from the ACC, stacking and cooling for 12h, marking after shearing, detecting defects, and warehousing for delivery processing.
3. The method for manufacturing a thick-walled high-strength ship plate steel for high heat input welding according to claim 1, wherein: the steel plate comprises the following chemical components in percentage by mass:
c: 0.05% -0.09%, Si: 0.10-0.30%, Mn: 1.50-1.70%, P is less than or equal to 0.010%, S is less than or equal to 0.0030%, Nb: 0.020% -0.040%, V: 0.020-0.040%, Ti: 0.008-0.020%, Cr: 0.10% -0.30%, Ni: 0.30-0.45%, Mo is less than or equal to 0.10%, Cu: 0.20-0.30%, B is less than or equal to 0.00050%, Al: 0.020% -0.050%, Mg: 0.0010 to 0.0030 percent, less than or equal to 0.0050 percent of N, less than or equal to 0.00030 percent of H, less than or equal to 0.010 percent of As, less than or equal to 0.010 percent of Sn, less than or equal to 0.010 percent of Sb, less than or equal to 0.010 percent of Bi, less than or equal to 0.010 percent of Pb, no Ca and the balance of Fe and impurities.
4. The method for manufacturing a thick-walled high-strength ship plate steel for high heat input welding according to claim 3, wherein: the steel plate comprises the following chemical components in percentage by mass:
c: 0.05 to 0.07 percent, Si: 0.10-0.20%, Mn: 1.50-1.60%, P is less than or equal to 0.010%, S is less than or equal to 0.0030%, Nb: 0.020% -0.030%, V: 0.020-0.030%, Ti: 0.008-0.018%, Cr: 0.10% -0.20%, Ni: 0.30-0.40%, Mo is less than or equal to 0.10%, Cu: 0.20-0.25%, B is less than or equal to 0.00050%, Al: 0.020-0.040%, Mg: 0.0010 to 0.0020 percent, less than or equal to 0.0050 percent of N, less than or equal to 0.00030 percent of H, less than or equal to 0.010 percent of As, less than or equal to 0.010 percent of Sn, less than or equal to 0.010 percent of Sb, less than or equal to 0.010 percent of Bi, less than or equal to 0.010 percent of Pb, no Ca and the balance of Fe and impurities.
5. The method for manufacturing a thick-walled high-strength ship plate steel for high heat input welding according to claim 3, wherein: the steel plate comprises the following chemical components in percentage by mass:
c: 0.06% -0.08%, Si: 0.15-0.25%, Mn: 1.55 to 1.65 percent of the total weight of the alloy, less than or equal to 0.010 percent of P, less than or equal to 0.0030 percent of S, and Nb: 0.025-0.035%, V: 0.025-0.035%, Ti: 0.010-0.020%, Cr: 0.15% -0.25%, Ni: 0.35-0.45%, Mo is less than or equal to 0.10%, Cu: 0.22-0.28%, B is less than or equal to 0.00050%, Al: 0.025-0.050%, Mg: 0.0012 to 0.0030 percent, less than or equal to 0.0050 percent of N, less than or equal to 0.00030 percent of H, less than or equal to 0.010 percent of As, less than or equal to 0.010 percent of Sn, less than or equal to 0.010 percent of Sb, less than or equal to 0.010 percent of Bi, less than or equal to 0.010 percent of Pb, no Ca and the balance of Fe and impurities.
6. The method for manufacturing a thick-walled high-strength ship plate steel for high heat input welding according to claim 3, wherein: the steel plate comprises the following chemical components in percentage by mass:
c: 0.07% -0.09%, Si: 0.20-0.30%, Mn: 1.60-1.70%, P is less than or equal to 0.008%, S is less than or equal to 0.0020%, Nb: 0.030-0.040%, V: 0.030-0.040%, Ti: 0.010-0.020%, Cr: 0.20-0.30%, Ni: 0.35-0.45%, Mo is less than or equal to 0.10%, Cu: 0.25-0.30%, B is less than or equal to 0.00050%, Al: 0.025% -0.045%, Mg: 0.0010 to 0.0030 percent, less than or equal to 0.0050 percent of N, less than or equal to 0.00030 percent of H, less than or equal to 0.010 percent of As, less than or equal to 0.010 percent of Sn, less than or equal to 0.010 percent of Sb, less than or equal to 0.010 percent of Bi, less than or equal to 0.010 percent of Pb, no Ca and the balance of Fe and impurities.
7. The method for manufacturing a thick-walled high-strength ship plate steel for high heat input welding according to claim 1, wherein: the steel plate has a specification of 60-120mm and a structure of ferrite and bainite.
CN202110457567.1A 2021-04-27 2021-04-27 Manufacturing method of thick-wall high-strength ship plate steel for high heat input welding Pending CN113249638A (en)

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CN113637917A (en) * 2021-08-19 2021-11-12 宝武集团鄂城钢铁有限公司 690 MPa-level ultrahigh-strength extra-thick ship plate steel with excellent low-temperature impact performance and production method thereof
CN114855085A (en) * 2022-05-19 2022-08-05 南京钢铁股份有限公司 Marine low-temperature L-shaped steel and welding process thereof
CN114934234A (en) * 2022-06-20 2022-08-23 广东韶钢松山股份有限公司 Method for controlling fracture of ship plate steel tensile sample not to be layered
CN116426822A (en) * 2023-03-30 2023-07-14 南京钢铁股份有限公司 TMCP low-cost high-heat input welding low-temperature structural steel and manufacturing method thereof
CN116426831A (en) * 2023-05-31 2023-07-14 南京钢铁股份有限公司 Steel for thick-wall low-temperature deep sea pipeline and production method thereof

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CN102080193A (en) * 2011-01-10 2011-06-01 东北大学 Structural steel for welding with ultra-great heat input and manufacturing method thereof
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CN113637917A (en) * 2021-08-19 2021-11-12 宝武集团鄂城钢铁有限公司 690 MPa-level ultrahigh-strength extra-thick ship plate steel with excellent low-temperature impact performance and production method thereof
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CN116426831A (en) * 2023-05-31 2023-07-14 南京钢铁股份有限公司 Steel for thick-wall low-temperature deep sea pipeline and production method thereof

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