CN112176247A - Steel plate for low-temperature pressure container and production method thereof - Google Patents

Steel plate for low-temperature pressure container and production method thereof Download PDF

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Publication number
CN112176247A
CN112176247A CN202010892587.7A CN202010892587A CN112176247A CN 112176247 A CN112176247 A CN 112176247A CN 202010892587 A CN202010892587 A CN 202010892587A CN 112176247 A CN112176247 A CN 112176247A
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temperature
low
normalizing
pressure vessel
temperature pressure
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Inventor
张学峰
玄玉民
邹扬
张跃飞
王雪松
魏运飞
狄国标
刘金刚
李群
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Shougang Jingtang United Iron and Steel Co Ltd
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Shougang Jingtang United Iron and Steel Co Ltd
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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
    • 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
    • C21D1/28—Normalising
    • 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
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/001—Heat treatment of ferrous alloys containing Ni
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/04—Modifying the physical properties of iron or steel by deformation by cold working of the surface
    • C21D7/06—Modifying the physical properties of iron or steel by deformation by cold working of the surface by shot-peening or the like
    • 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
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • 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
    • C22C38/04—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
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention provides a steel plate for a low-temperature pressure vessel, belonging to the technical field of medium plate processes, wherein the steel plate comprises the following chemical components in parts by mass: c: 0.07% -0.09%, Si: 0.15% -0.35%, Mn: 1.15% -1.35%, P: less than or equal to 0.015 percent, S: less than or equal to 0.003 percent, Alt: 0.025% -0.035%, Ni: 0.12 to 0.18 percent, and the balance of iron and inevitable impurities. The steel plate can meet the requirements of tensile property and low-temperature impact property at the temperature of-51 ℃. The invention also provides a production method of the steel plate for the low-temperature pressure container.

Description

Steel plate for low-temperature pressure container and production method thereof
Technical Field
The invention belongs to the technical field of medium plate processes, and relates to a steel plate for a low-temperature pressure container and a production method thereof.
Background
The American standard steel A516Gr.60 for the pressure vessel is a product of a medium plate of the American standard common strength level pressure vessel, has an execution standard of 516/SA-516M, and is generally used for building pressure vessels, refining storage tanks, pipelines and the like. Part of users designed for low-temperature use put forward special requirements on low-temperature impact performance, wherein the average value of the impact energy is 80J, the minimum value is 60J and the common thickness specification is 8-30mm at the temperature of-51 ℃. This type of steel is the most difficult to produce. The low-temperature toughness of the existing American standard pressure vessel steel A516Gr.60 does not meet the requirement.
Disclosure of Invention
In order to solve the technical problem of poor low-temperature impact toughness of the existing American standard A516Gr.60 steel plate, the invention provides a steel plate for a low-temperature pressure container, which can meet the requirements of tensile property and low-temperature impact property of-51 ℃.
The invention also provides a production method of the steel plate for the low-temperature pressure container.
The invention is realized by the following technical scheme:
a steel sheet for a low-temperature pressure vessel, the steel sheet having a chemical composition comprising, in mass fraction:
c: 0.07% -0.09%, Si: 0.15% -0.35%, Mn: 1.15% -1.35%, P: less than or equal to 0.015 percent, S: less than or equal to 0.003 percent, Alt: 0.025% -0.035%, Ni: 0.12 to 0.18 percent, and the balance of iron and inevitable impurities.
Preferably, the chemical composition of the steel plate comprises the following components in percentage by mass:
c: 0.084%, Si: 0.22%, Mn: 1.31%, P: 0.011%, S: 0.0019%, Alt: 0.027%, Ni: 0.16%, and the balance of iron and inevitable impurities.
A method for producing a steel sheet for a low-temperature pressure vessel, comprising:
refining after molten iron desulfurization and smelting;
carrying out vacuum treatment after refining to obtain molten steel, and continuously casting the molten steel into a plate blank, wherein the chemical components of the molten steel are the same as those of the steel plate;
heating and descaling a plate blank, and then carrying out rough rolling, finish rolling and laminar cooling and then carrying out thermal straightening;
and (4) normalizing the hot rolled plate obtained by hot straightening.
Further, the heating temperature of the plate blank is 1160-1180 ℃, and the heating time is 1-1.3 min/mm.
Further, the rough rolling process adopts double-frame rough rolling, the finish rolling process adopts double-frame finish rolling, the rolling process adopts two-stage temperature-controlled rolling, the finish rolling is started according to the thickness of 2.0 to 3.0 times of the thickness of a finished product, and the finish rolling temperature is 800-830 ℃.
Furthermore, in the laminar cooling process, the start cooling temperature is 770-800 ℃, the end cooling temperature is 600-630 ℃, and the cooling speed is 10-12 ℃/min.
Further, the normalizing treatment process comprises the following steps:
performing shot blasting treatment on the hot rolled plate, then performing normalizing treatment under the protection of nitrogen, and air-cooling after normalizing.
Wherein the normalizing temperature of the normalizing treatment is 880-920 ℃, the heating time is 1.8-2.0 min/mm, and the air cooling is carried out to the room temperature after the normalizing treatment.
Further, the normalizing treatment is performed in a continuous normalizing furnace.
Furthermore, KR method desulfurization is adopted in molten iron desulfurization, LF refining is adopted in refining, and vacuum treatment is carried out in a VD furnace.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
1. according to the steel plate for the low-temperature pressure container, the low-temperature toughness is improved on the basis of not reducing the strength of the steel plate by reducing carbon and extracting manganese, simultaneously adding nickel element and combining the improvement of the preparation process, the yield strength of the steel plate is 340-376MPa, the tensile strength is 464-495MPa, the elongation after fracture is not less than 43 percent, and the longitudinal impact energy KV at the temperature of-51 ℃ is2At 336-.
2. According to the steel plate for the low-temperature pressure container and the production method thereof, the steel rolling process and the normalizing process are improved, and the chemical components of molten steel are adjusted, so that the pearlite proportion and the ferrite proportion of the microstructure of the steel plate are reduced, and the low-temperature impact property is improved; meanwhile, the infinite solid solution of nickel and iron is added, ferrite grains are refined, the critical transition temperature is reduced, and the low-temperature toughness is improved.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the embodiment of the invention provides the following general ideas:
for the steel A516Gr.60 for the American standard pressure container for low-temperature application, the smelting components and the mechanical property of the steel have the following requirements:
(1) smelting component requirements are as follows: less than or equal to 0.21 percent of C, less than or equal to 0.40 percent of Si, less than or equal to 0.9 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.035 percent of S, less than or equal to 0.02 percent of Nb, less than or equal to 0.05 percent of Nb; the reduction of C and the extraction of Mn are allowed, the ratio upper limit of C is reduced by 0.01 percent, the Mn can be improved by 0.06 percent, and the maximum Mn is not more than 1.5 percent.
(2) And (6) normalizing for delivery.
(3) The mechanical property requirement is as follows: the yield strength is more than or equal to 220MPa, Rm is more than or equal to 415MPa and less than or equal to 550MPa, and A50 is more than or equal to 25 percent; longitudinal impact energy KV at-51 deg.C2The average value is more than or equal to 80J, and the minimum value is 60J.
The prior art steel A516Gr.60 for American standard pressure vessels does not meet the requirement of (3) longitudinal impact energy KV at-51 DEG C2The average value is more than or equal to 80J, and the minimum value is 60J.
The invention combines the improvement of rolling and heat treatment processes through reasonable alloy design, and the produced normalized delivery steel plate has-51 ℃ longitudinal impact energy KV2Not less than 336J, and excellent low-temperature impact performance.
Specifically, the invention provides a steel sheet for a low-temperature pressure vessel, which comprises the following chemical components in percentage by mass:
c: 0.07% -0.09%, Si: 0.15% -0.35%, Mn: 1.15% -1.35%, P: less than or equal to 0.015 percent, S: less than or equal to 0.003 percent, Alt: 0.025% -0.035%, Ni: 0.12 to 0.18 percent, and the balance of iron and inevitable impurities.
The carbon of the optimized components is reduced to 0.07-0.09% on the basis of common components, the ferrite structure proportion after normalizing is improved, and the impact toughness is improved; properly increasing the manganese element, controlling the target value to be 1.15-1.35%, refining the interlayer spacing of pearlite by playing the solid solution strengthening effect of the manganese element, obtaining a pearlite structure with higher strength, and making up the strength loss after carbon reduction; 0.12 to 0.18 percent of nickel is added; the A3 temperature is reduced to refine ferrite grains, the critical transformation temperature is reduced, and the low-temperature toughness is improved. According to the invention, the carbon is reduced and the manganese is extracted, so that on the basis of not reducing the strength, the pearlite proportion and the ferrite proportion of the microstructure after normalizing are reduced, and the low-temperature impact property is improved.
The invention relates to a production method of a steel plate for a low-temperature pressure container, which comprises the following steps:
(1) desulfurizing and smelting molten iron by a KR method, then carrying out LF refining, and carrying out vacuum treatment in a VD furnace after LF refining to obtain molten steel, wherein the chemical composition of the molten steel is the same as that of the steel plate;
(2) heating the plate blank at 1160-1180 ℃ for 1-1.3min/mm, then descaling, carrying out double-stand rough rolling and double-stand finish rolling, wherein the rolling process adopts two-stage temperature control rolling, the temperature is controlled by 2.0-3.0 times, and the finish rolling temperature is 800-830 ℃;
(3) carrying out ACC laminar cooling after finish rolling, wherein in the laminar cooling process, the start cooling temperature is 770-800 ℃, the final cooling temperature is 600-630 ℃, the cooling speed is 10-12 ℃/min, and finally carrying out thermal straightening;
(4) normalizing the hot rolled plate obtained by hot straightening: performing shot blasting treatment on the hot rolled plate, then performing continuous normalizing treatment in a normalizing furnace under the protection of nitrogen, wherein the normalizing temperature is 880-920 ℃, the heating time is 1.8-2.0 min/mm, and air cooling to room temperature after normalizing.
The process of the invention determines the phase transition temperature A3 point according to the component design, the industrial normalizing temperature is selected to be 880-920 ℃, the heating time is 1.8min/mm-2.0min/mm, the steel plate is air-cooled to the room temperature after normalizing, so that the steel plate obtains uniform austenite in the normalizing process, and uniform and fine ferrite and pearlite tissues are obtained after phase transition; excessive normalizing temperature or excessive normalizing time is avoided, so that coarse grains are easily caused, and the strength and toughness of the steel plate are reduced.
The steel plate prepared by the chemical components and the production process has the advantages that the normalizing performance meets the requirement, and the low-temperature toughness is excellent. The actual mechanical properties are as follows:
yield strength: the standard requirement is more than or equal to 220 MPa; actual 340-;
tensile strength: the standard requirement is that Rm is more than or equal to 415MPa and less than or equal to 550 MPa; actual 464-492MPa, average 470.5 MPa;
elongation (a 50): the standard requirement is more than or equal to 25 percent; actual 43-52%, average 47.5%;
longitudinal impact energy KV at-51 deg.C2: the standard requires that the average value is more than or equal to 80J, and the minimum value is 60J; actual 336-.
Hereinafter, a steel sheet for a low temperature pressure vessel and a method for manufacturing the same according to the present invention will be described in detail with reference to examples, comparative examples and experimental data.
Examples
The invention provides a steel plate for a low-temperature pressure vessel, which comprises the following chemical components in percentage by mass:
c: 0.07% -0.09%, Si: 0.15% -0.35%, Mn: 1.15% -1.35%, P: less than or equal to 0.015 percent, S: less than or equal to 0.003 percent, Alt: 0.025% -0.035%, Ni: 0.12 to 0.18 percent, and the balance of iron and inevitable impurities.
The chemical compositions of the steel sheets of examples 1 to 4 and comparative examples 1 to 4 are shown in table 1:
TABLE 1 chemical composition (wt%) of steel sheets of examples and comparative examples
C Si Mn P S Alt Ni Ceq
Example 1 0.084 0.22 1.31 0.011 0.0019 0.027 0.160 0.33
Example 2 0.075 0.23 1.32 0.010 0.0012 0.028 0.172 0.32
Example 3 0.081 0.27 1.33 0.012 0.0016 0.030 0.176 0.33
Example 4 0.072 0.23 1.33 0.010 0.0015 0.026 0.175 0.32
Comparative example 1 0.155 0.23 0.92 0.012 0.0019 0.030 - 0.31
Comparative example 2 0.152 0.25 0.91 0.011 0.0012 0.025 - 0.30
Comparative example 3 0.158 0.25 0.94 0.015 0.0012 0.025 - 0.32
Comparative example 4 0.16 0.31 0.94 0.013 0.0020 0.028 - 0.32
Of these, comparative examples 1 to 4 are 12.7mm ordinary normalized A516Gr.60 steels, and the steel sheets of examples have the same thickness as comparative examples.
The invention relates to a preparation method of a steel plate for a low-temperature pressure container, which comprises the following steps:
(1) desulfurizing and smelting molten iron by a KR method, then carrying out LF refining, and carrying out vacuum treatment in a VD furnace after LF refining to obtain molten steel, wherein the chemical composition of the molten steel is the same as that of the steel plate;
(2) heating the plate blank at 1160-1180 ℃ for 1-1.3min/mm, then descaling, carrying out double-stand rough rolling and double-stand finish rolling, wherein the rolling process adopts two-stage temperature control rolling, the temperature is controlled by 2.0-3.0 times, and the finish rolling temperature is 800-830 ℃;
(3) carrying out ACC laminar cooling after finish rolling, wherein in the laminar cooling process, the start cooling temperature is 770-800 ℃, the final cooling temperature is 600-630 ℃, the cooling speed is 10-12 ℃/min, and finally carrying out thermal straightening;
(4) normalizing the hot rolled plate obtained by hot straightening: performing shot blasting treatment on the hot rolled plate, then performing continuous normalizing treatment in a normalizing furnace under the protection of nitrogen, wherein the normalizing temperature is 880-920 ℃, the heating time is 1.8-2.0 min/mm, and air cooling to room temperature after normalizing.
The process parameters involved in the production of the steel sheets of examples 1-4 and comparative examples 1-4 are shown in table 2:
TABLE 2 Steel Rolling Process and normalizing Process parameters for the Steel sheets of the examples and comparative examples
Figure BDA0002657362750000051
In table 2, heating time: heating time of the billet in the heating furnace before the billet is rolled (the heating time is data in the actual production process);
after normalizing, the mechanical properties of the obtained steel sheet are shown in table 3:
TABLE 3 mechanical Properties of Steel sheets for examples and comparative examples
Figure BDA0002657362750000052
Figure BDA0002657362750000061
As can be seen from tables 1-3: the steel plates prepared in the examples 1 to 4 have the yield strength of 376MPa, the tensile strength of 464 MPa, the elongation percentage after fracture of 43 percent and the longitudinal impact energy KV of 51 ℃ below zero2At 336-. Has excellent low-temperature impact performance.
Steel sheets prepared in comparative examples 1 to 4, which had chemical compositions different from those of the present invention, were produced at-51 ℃ longitudinal impact energy KV2At 26-79, below the average value of 80J, the low temperature impact properties are poor.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. A steel sheet for a low-temperature pressure vessel, characterized in that the chemical composition of the steel sheet comprises, in mass fraction:
c: 0.07% -0.09%, Si: 0.15% -0.35%, Mn: 1.15% -1.35%, P: less than or equal to 0.015 percent, S: less than or equal to 0.003 percent, Alt: 0.025% -0.035%, Ni: 0.12 to 0.18 percent, and the balance of iron and inevitable impurities.
2. The steel sheet for a low-temperature pressure vessel according to claim 1, wherein the chemical composition of the steel sheet comprises, in mass percent:
c: 0.084%, Si: 0.22%, Mn: 1.31%, P: 0.011%, S: 0.0019%, Alt: 0.027%, Ni: 0.16%, and the balance of iron and inevitable impurities.
3. A method for producing a steel sheet for a low-temperature pressure vessel as set forth in claim 1 or 2, comprising:
refining after molten iron desulfurization and smelting;
carrying out vacuum treatment after refining to obtain molten steel, and continuously casting the molten steel into a plate blank, wherein the chemical composition of the molten steel is the same as that of the steel plate in claim 1 or 2;
heating and descaling a plate blank, and then carrying out rough rolling, finish rolling and laminar cooling and then carrying out thermal straightening;
and (4) normalizing the hot rolled plate obtained by hot straightening.
4. The method for producing the steel plate for the low-temperature pressure vessel as claimed in claim 3, wherein the slab is heated at 1160-1180 ℃ for 1-1.3 min/mm.
5. The method for producing a steel plate for a low-temperature pressure vessel according to claim 3, wherein the rough rolling process adopts double-stand rough rolling, the finish rolling process adopts double-stand finish rolling, the rolling process adopts two-stage temperature-controlled rolling, the finish rolling is started according to the thickness of 2.0 to 3.0 times of the thickness of a finished product, and the finish rolling temperature is 800 ℃ to 830 ℃.
6. The method for producing the steel plate for the low-temperature pressure vessel according to claim 3, wherein in the laminar cooling process, the start cooling temperature is 770-800 ℃, the end cooling temperature is 600-630 ℃, and the cooling speed is 10-12 ℃/min.
7. The method for producing a steel sheet for a low-temperature pressure vessel as set forth in claim 3, wherein the normalizing process is:
performing shot blasting treatment on the hot rolled plate, then performing normalizing treatment under the protection of nitrogen, and air-cooling after normalizing.
8. The method for producing a steel plate for a low-temperature pressure vessel according to claim 7, wherein the normalizing temperature is 880 ℃ to 920 ℃, the heating time is 1.8min/mm to 2.0min/mm, and the steel plate is air-cooled to room temperature after normalizing.
9. The method for producing a steel sheet for a low-temperature pressure vessel as set forth in claim 7, wherein the normalizing treatment is performed in a continuous normalizing furnace.
10. The method for producing a steel sheet for a low-temperature pressure vessel as set forth in claim 3, wherein the molten iron desulfurization is performed by KR method, the refining is performed by LF, and the vacuum treatment is performed in VD furnace.
CN202010892587.7A 2020-08-31 2020-08-31 Steel plate for low-temperature pressure container and production method thereof Pending CN112176247A (en)

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Application publication date: 20210105