CN117702005A - Steel plate for low-temperature pressure container and manufacturing method thereof - Google Patents
Steel plate for low-temperature pressure container and manufacturing method thereof Download PDFInfo
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- CN117702005A CN117702005A CN202311592055.1A CN202311592055A CN117702005A CN 117702005 A CN117702005 A CN 117702005A CN 202311592055 A CN202311592055 A CN 202311592055A CN 117702005 A CN117702005 A CN 117702005A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 90
- 239000010959 steel Substances 0.000 title claims abstract description 90
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052742 iron Inorganic materials 0.000 claims abstract description 15
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims description 26
- 238000005096 rolling process Methods 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 15
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- 238000007670 refining Methods 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 8
- 238000009749 continuous casting Methods 0.000 claims description 7
- 239000000835 fiber Substances 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 229910000859 α-Fe Inorganic materials 0.000 claims description 5
- 238000005266 casting Methods 0.000 claims description 4
- 229910001562 pearlite Inorganic materials 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 claims description 3
- 238000006356 dehydrogenation reaction Methods 0.000 claims description 3
- 230000003009 desulfurizing effect Effects 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 239000011572 manganese Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 14
- 230000008569 process Effects 0.000 description 12
- 229910052748 manganese Inorganic materials 0.000 description 8
- 239000010955 niobium Substances 0.000 description 7
- 229910052758 niobium Inorganic materials 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000004886 process control Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- 229910001257 Nb alloy Inorganic materials 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a steel plate for a low-temperature pressure container and a manufacturing method thereof: the steel plate comprises the following elements in percentage by mass: 0.11-0.14% of C, 0.15-0.25% of Si, 1.30-1.40% of Mn, 0.02-0.05% of Al, 0.015-0.025% of Nb, 0.01-0.02% of Ti, less than or equal to 0.02% of P, less than or equal to 0.005% of S, less than or equal to 0.005% of N, and the balance of iron and unavoidable impurity elements. The steel plate has the advantages of economical components and easiness in smelting and production.
Description
Technical Field
The invention relates to the field of metallurgy, in particular to a steel plate for a low-temperature pressure container and a manufacturing method thereof.
Background
With the increasing demands of energy and resources in the global scope, for the steel for low-temperature pressure containers, the reduction, the low cost and the serialization of the steel are realized, and the steel plate has specific performance through a special process, so that the safety performance of the steel plate under the service condition is improved, and the steel plate becomes an important development direction of the steel industry. The existing steel plate for the low-temperature pressure container needs to be added with a large amount of noble alloy elements such as Mn, nb/V, cu, cr and the like in order to ensure the strength and the toughness of the steel plate, and has poor economical efficiency.
Disclosure of Invention
The invention mainly aims to solve the technical problems of high alloy cost, poor uniformity of impact performance, poor stability and the like of the conventional steel plate for the normalizing low-temperature pressure vessel, and provides a steel plate for the normalizing low-temperature pressure vessel and a manufacturing method thereof, which have important effects on reducing the production and manufacturing cost of the steel plate for the normalizing low-temperature pressure vessel, improving the qualification rate and controlling the uniformity of performance. The composition design of the steel plate gives consideration to the strength, toughness and economy of the steel plate.
The invention provides a steel plate for a low-temperature pressure container, which comprises the following elements in percentage by mass: 0.11 to 0.14 percent of C, 0.15 to 0.25 percent of Si, 1.30 to 1.40 percent of Mn, 0.02 to 0.05 percent of Al, 0.015 to 0.025 percent of Nb, 0.01 to 0.02 percent of Ti, less than or equal to 0.02 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.005 percent of N, and the balance of iron and unavoidable impurity elements.
Further, the carbon equivalent Ceq of the steel plate is less than or equal to 0.38%.
Further, the yield strength of the steel plate is more than or equal to 320MPa, the tensile strength is more than or equal to 460MPa, the elongation is more than or equal to 40%, the Charpy impact energy at-20 ℃ is more than or equal to 250J, and the fiber section rate is more than or equal to 95%.
Further, the thickness of the steel plate is 8-30 mm.
Further, the steel sheet structure is ferrite and pearlite, and the grain size is not less than 9 grades.
The invention also provides a manufacturing method of the steel plate for the low-temperature pressure container, which comprises the following steps:
(1) Mechanically stirring and desulfurizing molten iron to ensure that the mass percentage of S in the molten iron is less than or equal to 0.010 percent;
(2) Adding corresponding metals into molten iron according to component design to perform converter smelting;
(3) Refining molten steel in a refining LF furnace to ensure that the mass percentage of molten steel S is less than or equal to 0.005%;
(3) Carrying out RH furnace vacuum dehydrogenation treatment on molten steel to ensure that the mass percentage of H in the molten steel is less than 2ppm;
(4) Feeding a silicon-calcium wire into the molten steel and carrying out soft stirring for not less than 10min;
(5) Performing continuous casting of the plate blank, performing non-oxidation protection casting in the continuous casting stage of the plate blank, controlling the superheat degree of a tundish at 25+/-5 ℃ and the pulling speed at 0.60-0.70 m/min;
(6) The slab is reheated, the temperature is controlled to 1150-1250 ℃, and the furnace time is not less than 1.0min/mm;
(7) Rough rolling, wherein the rough rolling temperature is 1000-1100 ℃;
(8) Finish rolling, wherein the finish rolling temperature is 820-860 ℃;
(9) The steel plate is cooled in an accelerated way, the cooling temperature is 710-750 ℃, and the cooling rate is controlled to be 10+/-5 ℃/s;
(10) Normalizing the steel plate at 880-900 ℃ for not less than 1.6min/mm;
(11) After the steel plate is taken out of the heat treatment furnace, normalizing and then cooling with weak water cooling acceleration, wherein the cooling temperature is 680-720 ℃.
Principle explanation: the normalizing heat treatment is a heat treatment process of heating steel to 30-50 ℃ above Ac3 temperature, preserving heat for a period of time and then cooling, and has the characteristics of uniform structure, grain refinement, elimination of rolling influence, obtaining of required structure and performance and the like. Carbon (C): carbon is a main element affecting strength, toughness, hardness and welding performance, and can form carbide with Nb, ti, cr, mo, fe to play roles of precipitation strengthening and grain refining toughening materials. The increase in carbon content has a remarkable effect on improving the strength and hardness of the steel, but the increase in carbon content has a negative effect on the ductility, toughness and weldability of the steel. Manganese (Mn): manganese is a solid solution strengthening element, and can improve the strength and hardness of steel and improve the toughness of steel. Moderately improves the hardenability of the steel and is helpful to obtain fine phase change products. In addition, manganese can also improve the solubility of the microalloy element niobium (Nb) in steel and inhibit the precipitation of niobium carbonitride. However, excessive Mn can cause Mn segregation in the center of a casting blank, and has great damage to the strength and toughness of a thick plate. The conventional normalized low-temperature pressure vessel steel adopts a low-carbon and high-manganese component design, and has poor economical efficiency. The composition design economy adopted by the invention is better, meanwhile, compared with the conventional air cooling process after normalizing heat treatment, the weak water cooling process after normalizing heat treatment adopted by the invention has the effects of specifically refining grains, improving strength and impact toughness, the conventional air cooling process after normalizing heat treatment can not meet the requirement of the fiber section rate of more than or equal to 95%, the weak water cooling process after normalizing heat treatment can improve the structure, and the obtained finer ferrite structure can meet the requirement of the high fiber section rate. Meanwhile, the cooling temperature is controlled within 680-720 ℃, the surface temperature of the steel plate is basically consistent with that of the weak water cooling and conventional air cooling process, no influence is caused on the plate shape of the steel plate, and corresponding internal stress cannot be generated due to higher cooling temperature. The invention has better economy and simultaneously combines the toughness and the plate shape control.
Compared with the prior art, the invention has the beneficial effects that:
(1) The applicable thickness of the steel plate for the low-temperature pressure container is 8-30 mm.
(2) The steel plate comprises the following components in percentage by weight: 0.11 to 0.14 percent of C, 0.15 to 0.25 percent of Si, 1.30 to 1.40 percent of Mn, 0.02 to 0.05 percent of Al, 0.015 to 0.025 percent of Nb, 0.01 to 0.02 percent of Ti, less than or equal to 0.02 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.005 percent of N, and the balance of iron and unavoidable impurity elements. The carbon equivalent Ceq [ =C+Mn/6+ (Cr+Mo+V)/5+ (Cu+Ni)/15 ] of the steel plate for the normalizing low-temperature pressure vessel is less than or equal to 0.38 percent. The content of Mn and Nb alloy elements is strictly controlled, noble alloy elements such as V, cu, cr and the like are not added, the component design gives consideration to the strength, toughness and economy of the steel plate, and the low-carbon high-alloy component system adopted by the component design of the traditional low-temperature pressure container steel is more economical.
(3) The method strictly controls the process, the S content and the H content of the finished product, adopts the pure Ca wire to carry out inclusion deformation treatment, ensures that the soft stirring time is not less than 10min, and ensures the purity and the cleanliness of the steel.
(4) The invention adopts the heat treatment normalizing and weak water cooling process, the obtained structure is ferrite and pearlite, the grain size is not lower than 9 grades, and the process and the structure type effectively ensure the low-temperature impact performance, the fiber section rate and the plate shape of the steel plate.
(5) The yield strength of the steel plate for the low-temperature pressure container is more than or equal to 320MPa, the tensile strength is more than or equal to 460MPa, the elongation (A50 mm) is more than or equal to 40%, the Charpy impact energy at-20 ℃ is more than or equal to 250J, and the fiber section rate is more than or equal to 95%.
In summary, the production and manufacturing method of the steel plate for the low-temperature pressure vessel has the advantages of good performance, low production cost, low service environment temperature, wide application range and the like, and has great popularization and application values.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 is a method for manufacturing a steel sheet for a low-temperature pressure vessel according to an embodiment of the present invention.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
The invention provides a steel plate for a low-temperature pressure container, which comprises the following elements in percentage by mass: 0.11 to 0.14 percent of C, 0.15 to 0.25 percent of Si, 1.30 to 1.40 percent of Mn, 0.02 to 0.05 percent of Al, 0.015 to 0.025 percent of Nb, 0.01 to 0.02 percent of Ti, less than or equal to 0.02 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.005 percent of N, and the balance of iron and unavoidable impurity elements. Low temperature means-20 ℃.
Further, the carbon equivalent Ceq [ =C+Mn/6+ (Cr+Mo+V)/5+ (Cu+Ni)/15 ]. Ltoreq.0.38% of the steel sheet.
Further, the yield strength of the steel plate is more than or equal to 320MPa, the tensile strength is more than or equal to 460MPa, the elongation is more than or equal to 40%, the Charpy impact energy at-20 ℃ is more than or equal to 250J, and the fiber section rate is more than or equal to 95%.
Further, the thickness of the steel plate is 8-30 mm.
Further, the steel sheet structure is ferrite and pearlite, and the grain size is not less than 9 grades.
The invention also provides a manufacturing method of the steel plate for the low-temperature pressure container, which comprises the following steps:
(1) Mechanically stirring and desulfurizing molten iron to ensure that the mass percentage of S in the molten iron is less than or equal to 0.010 percent;
(2) Adding corresponding metals into molten iron according to component design to perform converter smelting;
(3) Refining molten steel in a refining LF furnace to ensure that the mass percentage of molten steel S is less than or equal to 0.005%;
(3) Carrying out RH furnace vacuum dehydrogenation treatment on molten steel to ensure that the mass percentage of H in the molten steel is less than 2ppm;
(4) Feeding a silicon-calcium wire into the molten steel and carrying out soft stirring for not less than 10min;
(5) Performing continuous casting of the plate blank, performing non-oxidation protection casting in the continuous casting stage of the plate blank, controlling the superheat degree of a tundish at 25+/-5 ℃ and the pulling speed at 0.60-0.70 m/min;
(6) The slab is reheated, the temperature is controlled to 1150-1250 ℃, and the furnace time is not less than 1.0min/mm;
(7) Rough rolling, wherein the rough rolling temperature is 1000-1100 ℃;
(8) Finish rolling, wherein the finish rolling temperature is 820-860 ℃;
(9) The steel plate is cooled in an accelerated way, the cooling temperature is 710-750 ℃, and the cooling rate is controlled to be 10+/-5 ℃/s;
(10) Normalizing the steel plate at 880-900 ℃ for not less than 1.6min/mm;
(11) After the steel plate is taken out of the heat treatment furnace, normalizing and then cooling with weak water cooling acceleration, wherein the cooling temperature is 680-720 ℃.
The invention is illustrated below in some specific examples:
the process routes for the following examples 1, 2, 3 are: the process route is as follows: molten iron KR desulfurization, converter smelting, LF refining, RH vacuum treatment, slab continuous casting, slab reheating, rough rolling, finish rolling, rapid cooling of a steel plate, ultrasonic flaw detection, shot blasting and normalizing. The smelting furnace and rolling process control parameters of the embodiment are shown in table 1, smelting components of the smelting furnace are shown in table 2, the heat treatment process control parameters are shown in table 3, and the mechanical properties of the heat treated steel plate are shown in table 4.
Table 1: example smelting Heat and Rolling Process control parameters
Table 2: example smelting Heat smelting composition
Table 3: example heat treatment process control parameters for steel sheet:
table 4: mechanical properties of the steel sheet after heat treatment:
the above embodiments are merely examples of the present invention, but the present invention is not limited thereto, and any changes or modifications made by those skilled in the art are included in the scope of the present invention.
Claims (6)
1. A steel sheet for a low temperature pressure vessel, characterized in that: the steel plate comprises the following elements in percentage by mass: 0.11-0.14% of C, 0.15-0.25% of Si, 1.30-1.40% of Mn, 0.02-0.05% of Al, 0.015-0.025% of Nb, 0.01-0.02% of Ti, less than or equal to 0.02% of P, less than or equal to 0.005% of S, less than or equal to 0.005% of N, and the balance of iron and unavoidable impurity elements.
2. The steel sheet for a low-temperature pressure vessel according to claim 1, wherein: the carbon equivalent Ceq of the steel plate is less than or equal to 0.38 percent.
3. The steel sheet for a low-temperature pressure vessel according to claim 1, wherein: the yield strength of the steel plate is more than or equal to 320MPa, the tensile strength is more than or equal to 460MPa, the elongation is more than or equal to 40%, the Charpy impact energy at-20 ℃ is more than or equal to 250J, and the fiber section rate is more than or equal to 95%.
4. The steel sheet for a low-temperature pressure vessel according to claim 1, wherein: the thickness of the steel plate is 8-30 mm.
5. The steel sheet for a low-temperature pressure vessel according to claim 1, wherein: the steel plate structure is ferrite and pearlite, and the grain size is not less than grade 9.
6. A method of manufacturing the steel sheet for low-temperature pressure vessels as set forth in claim 1, comprising the steps of:
(1) Mechanically stirring and desulfurizing molten iron to ensure that the mass percentage of S in the molten iron is less than or equal to 0.010 percent;
(2) Adding corresponding metals into molten iron according to component design to perform converter smelting;
(3) Refining molten steel in a refining LF furnace to ensure that the mass percentage of molten steel S is less than or equal to 0.005%;
(4) Carrying out RH furnace vacuum dehydrogenation treatment on molten steel to ensure that the mass percentage of H in the molten steel is less than 2ppm;
(5) Feeding a silicon-calcium wire into the molten steel and carrying out soft stirring for not less than 10min;
(6) Performing continuous casting of the plate blank, performing non-oxidation protection casting in the continuous casting stage of the plate blank, controlling the superheat degree of a tundish at 25+/-5 ℃ and the pulling speed at 0.60-0.70 m/min;
(7) The slab is reheated, the temperature is controlled to 1150-1250 ℃, and the furnace time is not less than 1.0min/mm;
(8) Rough rolling, wherein the rough rolling temperature is 1000-1100 ℃;
(9) Finish rolling, wherein the finish rolling temperature is 820-860 ℃;
(10) The steel plate is cooled in an accelerated manner, the cooling temperature is 710-750 ℃, and the cooling rate is controlled to be 10+/-5 ℃/s;
(11) The normalizing temperature of the steel plate is 880-900 ℃, and the furnace time is not less than 1.6min/mm;
(12) And (3) carrying out weak water cooling acceleration cooling after normalizing after the steel plate is taken out of the heat treatment furnace, wherein the cooling temperature is 680-720 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311592055.1A CN117702005A (en) | 2023-11-27 | 2023-11-27 | Steel plate for low-temperature pressure container and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311592055.1A CN117702005A (en) | 2023-11-27 | 2023-11-27 | Steel plate for low-temperature pressure container and manufacturing method thereof |
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| Publication Number | Publication Date |
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| CN117702005A true CN117702005A (en) | 2024-03-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311592055.1A Pending CN117702005A (en) | 2023-11-27 | 2023-11-27 | Steel plate for low-temperature pressure container and manufacturing method thereof |
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| Country | Link |
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