CN116590610A - Normalizing type pressure vessel steel plate with yield strength of 370MPa and preparation method thereof - Google Patents
Normalizing type pressure vessel steel plate with yield strength of 370MPa and preparation method thereof Download PDFInfo
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- CN116590610A CN116590610A CN202310408040.9A CN202310408040A CN116590610A CN 116590610 A CN116590610 A CN 116590610A CN 202310408040 A CN202310408040 A CN 202310408040A CN 116590610 A CN116590610 A CN 116590610A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 78
- 239000010959 steel Substances 0.000 title claims abstract description 78
- 238000002360 preparation method Methods 0.000 title description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 239000000126 substance Substances 0.000 claims abstract description 14
- 239000012535 impurity Substances 0.000 claims abstract description 12
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims description 35
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 12
- 238000003723 Smelting Methods 0.000 claims description 10
- 229910001566 austenite Inorganic materials 0.000 claims description 10
- 238000001953 recrystallisation Methods 0.000 claims description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims description 9
- 230000009467 reduction Effects 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 239000011574 phosphorus Substances 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 3
- 229910001562 pearlite Inorganic materials 0.000 description 6
- 229910000859 α-Fe Inorganic materials 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000990 Ni alloy Inorganic materials 0.000 description 1
- 229910004688 Ti-V Inorganic materials 0.000 description 1
- 229910010968 Ti—V Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000003949 liquefied natural gas Substances 0.000 description 1
- 239000003915 liquefied petroleum gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- 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
- 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
- C22C38/04—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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a normalized yield strength 370 MPa-level pressure vessel steel plate, which comprises the following chemical components in percentage by weight: c:0.16 to 0.18 percent, si: less than or equal to 0.030 percent, mn:1.60 to 1.70 percent, P: less than or equal to 0.016 percent, S less than or equal to 0.005 percent, nb: 0.040-0.045%, ti: 0.010-0.015%, V:0.035 to 0.045 percent, and the balance of Fe and unavoidable impurities. Its preparing process is also disclosed. The invention aims to provide a pressure vessel steel plate with yield strength larger than 370MPa, good plasticity, low-temperature impact toughness and high-temperature tensile property, low production cost and short production period and a manufacturing method thereof.
Description
Technical Field
The invention relates to the technical field of low-alloy pressure vessel steel, in particular to a pressure vessel steel plate with normalized yield strength of 370MPa and a preparation method thereof.
Background
The pressure vessel is widely applied to the departments of chemical industry, petroleum, machinery, power, metallurgy, nuclear energy, aviation, aerospace, ocean and the like. It is an essential core device in the industrial production process and is an important mark of the national equipment manufacturing level. The pressure vessel steel plate is a large class of special high-technical-content and high-added-value product in the medium plate. The steel for pressure vessels for storing and transporting low-temperature liquids such as liquefied petroleum gas, liquefied natural gas and the like is required to have excellent toughness and high-temperature mechanical properties as well as excellent low-temperature impact toughness. The common Ni-based steel for low-temperature containers is one of container steels, belongs to typical products with high added value and high technical content, and has great technical difficulty and production difficulty.
Chinese patent CN101082104a discloses a Ni-free microalloy low temperature pressure vessel steel and a method for manufacturing the same, the components in mass percent are: 0.04 to 0.08 percent of C, less than 0.6 percent of Si, 1.0 to 1.6 percent of Mn, 0.010 to 0.030 percent of Nb, 0.005 to 0.030 percent of Ti, less than 0.070 percent of V, 0.004 to 0.060 percent of Al, less than 0.008 percent of N, less than 0.015 percent of P, less than 0.010 percent of S, and the balance of Fe and unavoidable impurities. The yield strength of the steel plate reaches more than 360MPa by adopting a TMCP rolling method, the tensile strength exceeds 490MPa, the low-temperature impact toughness meets the requirement of minus 60 ℃ (namely meets the impact energy of minus 60 ℃ not less than 41J), and the steel plate has good plasticity and weldability. Because noble metals Ni and Mo are not added, and TMCP rolling is adopted to replace quenching and tempering, the production cost can be reduced and the manufacturing period can be shortened. The disadvantage is that the ultra-low carbon design is adopted, and the smelting cost is increased.
Chinese patent CN101871077a discloses a "normalized high strength pressure vessel steel and its manufacturing method", the chemical components in weight percentage are: c:0.12 to 0.18 percent of Si:0.15 to 0.40 percent of Mn:1.20 to 1.70 percent, P is less than or equal to 0.020 percent, S is less than or equal to 0.015 percent, ni:0.10 to 0.40 percent of Nb:0.01 to 0.05 percent of Ti:0.01 to 0.03 percent of Als:0.015 to 0.050 percent, and one or two of V less than or equal to 0.20 percent and Cu less than or equal to 0.70 percent, and the balance of Fe and unavoidable impurities. The specification of the steel plate is controlled by a single rolling process, and after controlled rolling, uniform ferrite and pearlite tissues are obtained by adopting a normalizing process with a normalizing temperature of 840-920 ℃ and a heat preservation time of 30-40 min+t multiplied by 1 min/mm. The steel plate has good strength, plasticity, toughness and welding performance. The disadvantage is that Ni alloy is added, which increases the cost.
Chinese patent CN101713044a discloses "a steel for Q370R pressure vessel and preparation method thereof", the chemical components in weight percentage are: c:0.14 to 0.18 percent, si:0.25 to 0.50 percent, mn:1.45 to 1.60 percent, P is less than or equal to 0.020 percent, S is less than or equal to 0.015 percent, and Nd:0.28 to 0.45 percent, and the balance of Fe and unavoidable impurities. The steel for the Q370R pressure vessel optimizes the component proportion and the heat treatment process, improves the low-temperature impact toughness on the basis that the tensile strength and the yield strength meet the standards GB713-2014, and has the impact energy of more than 100J, up to 180J and higher than the national standard at the temperature of minus 20 ℃.
Disclosure of Invention
The invention aims to provide a pressure vessel steel plate with yield strength larger than 370MPa, good plasticity, low-temperature impact toughness and high-temperature tensile property, low production cost and short production period and a manufacturing method thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses a pressure vessel steel plate with normalized yield strength of 370MPa, which comprises the following chemical components in percentage by weight: c:0.16 to 0.18 percent, si: less than or equal to 0.030 percent, mn:1.60 to 1.70 percent, P: less than or equal to 0.016 percent, S less than or equal to 0.005 percent, nb: 0.040-0.045%, ti: 0.010-0.015%, V:0.035 to 0.045 percent, and the balance of Fe and unavoidable impurities.
Further, the steel plate comprises the following chemical components in percentage by weight: c:0.18%, si:0.25%, mn:1.65%, P:0.015%, S0.005%, nb:0.045%, ti:0.013%, V:0.042%, the balance being Fe and unavoidable impurities.
Further, the steel plate comprises the following chemical components in percentage by weight: c:0.17%, si:0.26%, mn:1.60%, P:0.016%, S0.004%, nb:0.040%, ti:0.015%, V:0.040%, the balance being Fe and unavoidable impurities.
Further, the steel plate comprises the following chemical components in percentage by weight: c:0.16%, si:0.28%, mn:1.70%, P:0.015%, S0.005%, nb:0.042%, ti:0.012%, V:0.036% and the balance of Fe and unavoidable impurities.
A preparation method of a pressure vessel steel plate with normalized yield strength of 370MPa level comprises the following steps:
1) Smelting and casting
Adding prepared high-quality scrap steel with low phosphorus content (less than or equal to 0.010%), low sulfur content (less than or equal to 0.005%), low oxygen content (less than or equal to 0.0040%), low nitrogen content (less than or equal to 0.0060%) and other alloy prepared by calculation into a vacuum smelting furnace, vacuumizing, starting to perform smelting, casting into a rectangular steel mould after smelting, and casting into rectangular steel billets with the size of 220 multiplied by 250 multiplied by 300 mm;
2) Heating and rolling:
loading the steel billet into a high-temperature resistance furnace by using a mechanical arm, wherein the heating temperature is 1190-1210 ℃, the total furnace time is more than or equal to 240min, the steel billet temperature is ensured to be uniform, when the steel billet meets the heating requirement, the steel billet is conveyed to a rolling mill by using the mechanical arm, the rolling is divided into two stages, the first stage is rolled in an austenite recrystallization region, the reduction rate of the first pass of rough rolling is controlled to be more than 10%, the second stage is rolled in an austenite non-recrystallization region, the finish rolling start temperature is 920+/-10 ℃, the initial rolling thickness is 42mm, and the final rolling temperature is 840+/-10 ℃; then adopting controlled cooling, wherein the final cooling temperature is less than or equal to 700 ℃;
3) Normalizing heat treatment
Normalizing the rolled and cooled steel plate sample at 860, 880 and 900 ℃ for a furnace time t= (1.4t+10) min, wherein T is the thickness of the steel plate, and then air cooling.
Further, the mechanical properties and the technological properties of the prepared steel plate meet the following conditions: the yield strength is more than or equal to 370MPa, the tensile strength is 530-630 MPa, and the elongation A is more than or equal to 20.0%.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention has the advantages of no noble metal such as Ni, low alloy element content, low alloy cost, good plasticity, low-temperature impact toughness and high-temperature tensile property, simple preparation process flow, short production period and low production cost through reasonable component design.
The hot rolled steel strip adopts the component design of C-Si-Mn-Nb-Ti-V, has the microstructure of ferrite and pearlite, has the characteristics of proper high strength, good plasticity, low-temperature impact toughness, high-temperature tensile property and the like, and simultaneously has the characteristics of simple preparation process flow, short production period, low production cost and the like. The mechanical property and the technological property meet the requirements that the yield strength is more than or equal to 370MPa, the tensile strength is more than or equal to 530-630 MPa, the elongation A is more than or equal to 20 percent, and the impact value at minus 20 ℃ is good.
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 is a rolled metallographic structure of a steel sheet according to example 2 of the present invention;
FIG. 2 shows the metallurgical structure of the steel sheet according to example 2 of the present invention after normalizing.
Detailed Description
As shown in figure 1, a normalized pressure vessel steel plate with yield strength of 370MPa
The present invention will be described in more detail with reference to examples. These examples are merely illustrative of the best modes of carrying out the invention and do not limit the scope of the invention in any way.
Example 1
Smelting according to chemical compositions shown in Table 1, casting into steel ingots, heating the steel ingots to 1190 ℃, heating the steel ingots for 250 minutes in a furnace, performing first-stage rolling on an experimental rolling mill, namely austenite recrystallization zone rolling, wherein the reduction of the first pass is more than 10%, controlling the reduction of at least 1-2 passes to be more than 25%, when the thickness of a rolled piece is 42mm, heating the steel ingots to 910 ℃ on a roller table, and performing second-stage rolling, namely austenite non-recrystallization zone rolling. The finishing temperature is 830 ℃, and the thickness of the finished steel plate is 14mm. The rolled steel plate is cooled under control, the final cooling temperature is less than or equal to 700 ℃, and the ferrite and pearlite structure with fine and uniform grains is obtained. Normalizing experiment is carried out on the rolled and cooled steel plate sample, the normalizing temperature is 860 ℃, the furnace time T= (1.4t+10) min is carried out, wherein T is the thickness of the steel plate, and then air cooling is carried out.
Example 2
The embodiment is the same as that of example 1, the heating temperature is 1200 ℃, the total furnace time is 255 minutes, the first stage rolling, namely the austenite recrystallization zone rolling, is carried out on an experimental rolling mill, the reduction of the first pass is more than 10%, the reduction of the second pass is at least 1-2 passes is controlled to be more than 25%, when the thickness of a rolled piece is 42mm, the temperature is kept to 920 ℃ on a roller way, and the second stage rolling, namely the austenite non-recrystallization zone rolling, is carried out. The final rolling temperature is 840 ℃, and the thickness of the finished steel plate is 14mm. The rolled steel plate is cooled under control, the final cooling temperature is less than or equal to 700 ℃, and the ferrite and pearlite structure with fine and uniform grains is obtained. Normalizing experiment is carried out on the rolled and cooled steel plate sample, the normalizing temperature is 880 ℃, the furnace time T= (1.4t+10) min is carried out, wherein T is the thickness of the steel plate, and then air cooling is carried out.
Fig. 1 is a typical microstructure of the steel strip prepared in this example, from which it can be seen that the microstructure is ferrite + a small amount of pearlite.
Example 3
The embodiment is the same as example 1, wherein the heating temperature is 1210 ℃, the total furnace time is 260 minutes, the first stage rolling, namely the austenite recrystallization zone rolling, is carried out on an experimental rolling mill, the reduction of the first pass is more than 10%, the reduction of the second pass is at least 1-2 times and is controlled to be more than 25%, when the thickness of a rolled piece is 42mm, the temperature is kept to 930 ℃ on a roller way, and the second stage rolling, namely the austenite non-recrystallization zone rolling, is carried out. The final rolling temperature is 850 ℃, and the thickness of the finished steel plate is 14mm. The rolled steel plate is cooled under control, the final cooling temperature is less than or equal to 700 ℃, and the ferrite and pearlite structure with fine and uniform grains is obtained. Normalizing experiment is carried out on the rolled and cooled steel plate sample, the normalizing temperature is 900 ℃, and the furnace time T= (1.4t+10) min is carried out, wherein T is the thickness of the steel plate, and then air cooling is carried out.
TABLE 1 chemical Components (wt%) of examples 1 to 3 of the present invention
| Implementation of the embodiments | C | Si | Mn | P | S | Nb | V | Ti |
| 1 | 0.18 | 0.25 | 1.65 | 0.015 | 0.005 | 0.045 | 0.042 | 0.013 |
| 2 | 0.17 | 0.26 | 1.60 | 0.016 | 0.004 | 0.040 | 0.040 | 0.015 |
| 3 | 0.16 | 0.28 | 1.70 | 0.015 | 0.005 | 0.042 | 0.036 | 0.012 |
TABLE 2 mechanical Properties of the heat-treated Steel sheets of examples 1 to 3 of the present invention
As can be seen from the data in Table 2, the steel plate for the pressure vessel with the yield strength being more than 370MPa and the preparation method thereof are provided, the mechanical property and the technological property meet the requirements that the yield strength is more than or equal to 370MPa, the tensile strength is 530-630 MPa, the elongation A is more than or equal to 20.0%, and the steel plate has good longitudinal impact energy at-20 ℃.
From the results of the examples, it is apparent that the steel sheet for pressure vessels of the present invention has excellent mechanical properties, good plasticity and low-temperature impact toughness, and also has good high-temperature tensile properties.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (6)
1. The normalized type pressure vessel steel plate with the yield strength of 370MPa is characterized by comprising the following chemical components in percentage by weight: c:0.16 to 0.18 percent, si: less than or equal to 0.030 percent, mn:1.60 to 1.70 percent, P: less than or equal to 0.016 percent, S less than or equal to 0.005 percent, nb: 0.040-0.045%, ti: 0.010-0.015%, V:0.035 to 0.045 percent, and the balance of Fe and unavoidable impurities.
2. The normalized yield strength 370 MPa-level pressure vessel steel plate of claim 1, wherein the chemical components of the steel plate comprise in weight percent: c:0.18%, si:0.25%, mn:1.65%, P:0.015%, S0.005%, nb:0.045%, ti:0.013%, V:0.042%, the balance being Fe and unavoidable impurities.
3. The normalized yield strength 370 MPa-level pressure vessel steel plate of claim 1, wherein the chemical components of the steel plate comprise in weight percent: c:0.17%, si:0.26%, mn:1.60%, P:0.016%, S0.004%, nb:0.040%, ti:0.015%, V:0.040%, the balance being Fe and unavoidable impurities.
4. The normalized yield strength 370 MPa-level pressure vessel steel plate of claim 1, wherein the chemical components of the steel plate comprise in weight percent: c:0.16%, si:0.28%, mn:1.70%, P:0.015%, S0.005%, nb:0.042%, ti:0.012%, V:0.036% and the balance of Fe and unavoidable impurities.
5. The method for manufacturing a normalized type pressure vessel steel plate with yield strength of 370MPa level according to claim 1, comprising:
1) Smelting and casting
Adding prepared high-quality scrap steel with low phosphorus content (less than or equal to 0.010%), low sulfur content (less than or equal to 0.005%), low oxygen content (less than or equal to 0.0040%), low nitrogen content (less than or equal to 0.0060%) and other alloy prepared by calculation into a vacuum smelting furnace, vacuumizing, starting to perform smelting, casting into a rectangular steel mould after smelting, and casting into rectangular steel billets with the size of 220 multiplied by 250 multiplied by 300 mm;
2) Heating and rolling:
loading the steel billet into a high-temperature resistance furnace by using a mechanical arm, wherein the heating temperature is 1190-1210 ℃, the total furnace time is more than or equal to 240min, the steel billet temperature is ensured to be uniform, when the steel billet meets the heating requirement, the steel billet is conveyed to a rolling mill by using the mechanical arm, the rolling is divided into two stages, the first stage is rolled in an austenite recrystallization region, the reduction rate of the first pass of rough rolling is controlled to be more than 10%, the second stage is rolled in an austenite non-recrystallization region, the finish rolling start temperature is 920+/-10 ℃, the initial rolling thickness is 42mm, and the final rolling temperature is 840+/-10 ℃; then adopting controlled cooling, wherein the final cooling temperature is less than or equal to 700 ℃;
3) Normalizing heat treatment
Normalizing the rolled and cooled steel plate sample at 860, 880 and 900 ℃ for a furnace time t= (1.4t+10) min, wherein T is the thickness of the steel plate, and then air cooling.
6. The method for preparing a normalized yield strength 370 MPa-grade pressure vessel steel plate according to claim 5, wherein the prepared steel plate has mechanical properties and technological properties satisfying the following: the yield strength is more than or equal to 370MPa, the tensile strength is 530-630 MPa, and the elongation A is more than or equal to 20.0%.
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2023
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