CN115558848A - Ultralow temperature container steel plate and production method thereof - Google Patents
Ultralow temperature container steel plate and production method thereof Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 99
- 239000010959 steel Substances 0.000 title claims abstract description 99
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000005096 rolling process Methods 0.000 claims abstract description 45
- 238000010438 heat treatment Methods 0.000 claims abstract description 39
- 238000009749 continuous casting Methods 0.000 claims abstract description 22
- 238000003723 Smelting Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000012535 impurity Substances 0.000 claims abstract description 10
- 238000005452 bending Methods 0.000 claims abstract description 6
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 5
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 5
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 4
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 4
- 238000005266 casting Methods 0.000 claims description 15
- 230000009467 reduction Effects 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000010791 quenching Methods 0.000 claims description 10
- 230000000171 quenching effect Effects 0.000 claims description 10
- 238000005496 tempering Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 238000002791 soaking Methods 0.000 claims description 7
- 238000009489 vacuum treatment Methods 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 238000013461 design Methods 0.000 abstract description 2
- 239000000956 alloy Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000007246 mechanism Effects 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
- 238000007670 refining Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
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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
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and 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
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- 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
- C22C38/18—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
-
- 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
- C22C38/18—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
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
Abstract
The invention discloses an ultralow temperature container steel plate and a production method thereof, wherein the steel plate comprises the following components in percentage by weight: 0.05 to 0.09 percent of C, 0.15 to 0.20 percent of Si, 0.90 to 1.30 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.005 percent of B, 0.10 to 0.20 percent of Cr, 0.10 to 0.18 percent of Mo, 0.015 to 0.020 percent of Nb, 0.20 to 0.35 percent of Ni, 0.010 to 0.020 percent of Ti, less than 0.3 percent of Cu, less than or equal to 0.05 percent of Zr, and the balance of Fe and inevitable impurities. The production method comprises the working procedures of smelting, continuous casting, steel rolling and heat treatment. The steel plate provided by the invention has excellent normal-temperature stretching, high-temperature stretching and room-temperature bending properties, particularly has good low-temperature impact toughness, and completely meets the design and manufacture requirements of pressure-bearing equipment.
Description
Technical Field
The invention relates to an ultralow temperature container steel plate and a production method thereof, belonging to the technical field of ferrous metallurgy.
Background
The ultra-low temperature container series steel plate has the characteristics of excellent high pressure resistance, impact resistance, water-gas corrosion resistance and the like on the basis of good obdurability matching and good welding and cold bending performance, is suitable for working in a medium-temperature (below 350 ℃) high-pressure state for a long time, is commonly used for manufacturing various medium-low temperature pressure-bearing containers and important accessories such as reactors, heat exchangers, separators, spherical tanks, oil gas tanks, nuclear reactor pressure shells, boiler steam drums, high-pressure water pipes of hydropower stations, turbine volutes and the like, and is widely applied to the industries such as petrochemical industry, coal chemical industry, power stations, boilers and the like. However, in recent years, as the equipment in China has become larger and more complicated, the requirements for the specification and performance indexes, particularly low-temperature impact toughness and high-temperature tensile properties, of the steel sheet for pressure-bearing equipment have become more and more stringent. In order to meet the severe requirements of users, the research and development of a new generation of ultra-low temperature container series steel plate is imminent.
Disclosure of Invention
The invention aims to provide an ultralow temperature container steel plate with excellent internal and external comprehensive properties, and the provided steel plate has good toughness and can meet the use requirements of medium-low temperature and high-pressure environments.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
an ultralow temperature container steel plate comprises the following chemical components in percentage by weight: 0.05 to 0.09 percent of C, 0.15 to 0.20 percent of Si, 0.90 to 1.30 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.005 percent of B, 0.10 to 0.20 percent of Cr, 0.10 to 0.18 percent of Mo, 0.015 to 0.020 percent of Nb, 0.20 to 0.35 percent of Ni, 0.010 to 0.020 percent of Ti, less than 0.3 percent of Cu, less than or equal to 0.05 percent of Zr, and the balance of Fe and inevitable impurities.
The thickness of the steel plate of the ultralow temperature container is 8-100mm.
The invention also aims to provide a production method of the steel plate of the ultralow temperature container, which comprises the working procedures of smelting, continuous casting, steel rolling and heat treatment.
The casting blank smelting process comprises the following steps: a converter or an electric furnace is adopted for primary smelting, and then the steel is refined by an LF furnace and is transported to a continuous casting steel casting platform for casting after VD vacuum treatment; the continuous casting billet comprises the following chemical components in percentage by weight: 0.05 to 0.09 percent of C, 0.15 to 0.20 percent of Si, 0.90 to 1.30 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.005 percent of B, 0.10 to 0.20 percent of Cr, 0.10 to 0.18 percent of Mo, 0.015 to 0.020 percent of Nb, 0.20 to 0.35 percent of Ni, 0.010 to 0.020 percent of Ti, less than 0.3 percent of Cu, less than or equal to 0.05 percent of Zr, and the balance of Fe and inevitable impurities.
The steel rolling process of the invention comprises the following steps: heating the soaking pit furnace to 1250-1300 ℃ for 11.5-13min/mm, and then rolling; the rolling process adopts II type controlled rolling, the rolling temperature of one stage is 1150-1180 ℃, and the reduction rate of each pass is 10-12%; the initial rolling temperature of the two stages is 840-870 ℃, and the reduction rate of each pass is 8-10%.
The heat treatment of the invention: the quenching temperature of the steel plate is 880-910 ℃, the total heating time is 2.0-3.0min/mm, and the water amount of the high-pressure section is 3800-4200m 3 Cooling to 20-25 deg.C with water/h, tempering at 685-715 deg.C, and heating for 3.0-4.0min/mm to obtain the final product. The chemical composition of the steel plate sampling test is 0.05-0.09% of C, 0.15-0.20% of Si, 0.90-1.30% of Mn, less than or equal to 0.008% of P, less than or equal to 0.002% of S, less than or equal to 0.005% of B, 0.10-0.20% of Cr, 0.10-0.18% of Mo, 0.015-0.020% of Nb, 0.20-0.35% of Ni, 0.010-0.020% of Ti, less than 0.3% of Cu, less than or equal to 0.05% of Zr, and the balance of Fe and inevitable impurities.
The steel plate provided by the invention has the following characteristics: (1) the steel plate has excellent low-temperature impact toughness. Keeping the steel plate die welding temperature at 650 ℃ for 12h, and then keeping the KV2 impact energy single value at-60 ℃ to be more than 60 joules; (2) delivering cold bending d =2a,180 degrees and having no crack on the appearance, wherein d is the diameter of the bending core, and a is the thickness of the sample; (3) the tensile yield strength Rp0.2 at the high temperature of 350 ℃ is more than or equal to 230MPa after the mold welding temperature is 650 ℃ and the heat preservation is 12 hours.
The technical scheme provided by the invention has the following principle: the invention introduces a novel component design concept, optimizes the proportion of each element in the steel, adopts a low C, si, mn, mo, cr and Ni composite strengthening mechanism, is matched with and added with a small amount of microalloy Nb and Ti elements, and is added with a proper amount of B elements for enhancing the hardenability of the steel plate, fully exerts the maximum action of each element with less content and proportion of alloy elements, and ensures that the performance of the steel plate is stable and good. The C, si and Mn in the invention can directly influence the strength, plasticity and welding performance of steel, and the content thereof is reasonably controlled; cr, mo and Ni elements can enhance the hardenability of steel and improve the strength, toughness and heat resistance of the steel, but the alloy cost is increased easily due to excessive addition. The invention adopts relatively less content of noble alloy elements to obtain relatively better internal performance; solid solution formed by a small amount of microalloy element Nb and carbide formed by a small amount of Ti element in steel can play roles in solid solution strengthening and refining the structure and crystal grains of the steel, thereby improving the strength, toughness and matching of the steel; trace B element can obviously improve the hardenability of the steel and further improve the uniformity of the full-thickness performance of the steel plate. Compared with the conventional production process, the content of the noble alloy elements added into the steel plate is relatively low, the smelting cost and the subsequent production cost are controlled to be low, and the market potential and the competitiveness are great.
The beneficial effect that adopts above-mentioned technical scheme to produce lies in:
the invention adopts a converter or an electric furnace for smelting, has high molten steel cleanliness, low content of residual elements and harmful elements in the steel, various smelting modes and convenient operation. Meanwhile, the addition amount of alloy elements is relatively less, and the smelting cost is obviously reduced; the heat treatment can be carried out in various furnace types such as a quenching furnace, a normalizing furnace (with NAC function), a vehicle bottom furnace (with a quenching tank) and the like, and the production is easy to arrange.
The steel plate provided by the invention meets the requirements of normal-temperature stretching, high-temperature stretching and low-temperature impact performance under medium and low temperature environments required by pressure-bearing equipment in the industries of petrochemical industry, coal chemical industry, power stations, boilers and the like, and is completely suitable for manufacturing various pressure containers and important accessories such as reactors, heat exchangers, separators, spherical tanks, oil gas tanks, nuclear energy reactor pressure shells, boiler drums, hydropower station high-pressure water pipes, water turbine volutes and the like.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
The thickness of the steel plate of the ultralow temperature container in the embodiment is 8mm, and the steel plate consists of the following components in percentage by weight: 0.08% of C, 0.15% of Si, 0.90% of Mn, 0.008% of P, 0.002% of S, 0.0010% of B, 0.10% of Cr, 0.10% of Mo, 0.015% of Nb, 0.20% of Ni, 0.010% of Ti, 0.02% of Cu, 0.05% of Zr, and the balance of Fe and inevitable impurities.
The production steps of the steel plate of the ultra-low temperature container in the embodiment are as follows:
(1) Smelting and continuous casting: and a converter or an electric furnace is adopted for primary smelting, and then the steel is refined by an LF furnace and is transported to a continuous casting steel casting platform for casting after VD vacuum treatment to obtain a continuous casting billet.
(2) A rolling procedure: heating to 1250 ℃ in a soaking furnace, and rolling after the heating time is 11.5 min/mm. The rolling process adopts II type controlled rolling, the initial rolling temperature of one stage is 1150 ℃, and the reduction rate of each pass is 12 percent; the initial rolling temperature of the two stages is 840 ℃, and the reduction rate of each pass is 10%.
(3) A heat treatment process: the quenching temperature of the steel plate is 880 ℃, the total heating time is 2.0min/mm, and the water amount of the high-pressure section is 3800m 3 Cooling to 20 ℃ with water, tempering at 715 ℃, and performing heat treatment for 3.0min/mm to obtain the ultralow temperature container steel plate.
Example 2
The thickness of the steel plate of the ultralow temperature container in the embodiment is 22mm, and the steel plate comprises the following components in percentage by weight: 0.07% of C, 0.16% of Si, 0.95% of Mn, 0.007% of P, 0.002% of S, 0.002% of B, 0.12% of Cr, 0.11% of Mo, 0.016% of Nb, 0.24% of Ni, 0.012% of Ti, 0.03% of Cu, 0.04% of Zr, and the balance of Fe and inevitable impurities.
The production steps of the steel plate of the ultra-low temperature container in the embodiment are as follows:
(1) Smelting and continuous casting: and a converter or an electric furnace is adopted for primary smelting, and then the steel is refined in an LF furnace and subjected to VD vacuum treatment, and then the steel is transported to a continuous casting steel casting platform for casting to obtain a continuous casting billet.
(2) A rolling procedure: heating to 1255 deg.C in soaking pit furnace for 12min/mm, and rolling. The rolling process adopts II type controlled rolling, the initial rolling temperature of one stage is 1155 ℃, and the reduction rate of each pass is 11 percent; the initial rolling temperature of the two stages is 850 ℃, and the reduction rate of each pass is 9 percent.
(3) A heat treatment process: the quenching temperature of the steel plate is 890 ℃, the total heating time is 2.2min/mm, and the water quantity of a high-pressure section is 3900m 3 Cooling to 22 ℃ with water/h, tempering at 705 ℃, and carrying out heat treatment for 3.2min/mm to obtain the ultralow temperature container steel plate.
Example 3
The thickness of the steel plate of the ultralow temperature container in the embodiment is 45mm, and the steel plate consists of the following components in percentage by weight: 0.09% of C, 0.17% of Si, 1.00% of Mn, 0.006% of P, 0.001% of S, 0.003% of B, 0.14% of Cr, 0.13% of Mo, 0.017% of Nb, 0.26% of Ni, 0.014% of Ti, 0.06% of Cu, 0.03% of Zr, and the balance of Fe and inevitable impurities.
The production steps of the steel plate of the ultra-low temperature container in the embodiment are as follows:
(1) Smelting and continuous casting: and a converter or an electric furnace is adopted for primary smelting, and then the steel is refined in an LF furnace and subjected to VD vacuum treatment, and then the steel is transported to a continuous casting steel casting platform for casting to obtain a continuous casting billet.
(2) A rolling procedure: heating to 1260 ℃ in a soaking furnace, and rolling after the heating time is 12.5 min/mm. The rolling process adopts II type controlled rolling, the initial rolling temperature of one stage is 1160 ℃, and the reduction rate of each pass is 10.5 percent; the initial rolling temperature of the two stages is 860 ℃, and the reduction rate of each pass is 9.5%.
(3) A heat treatment process: the quenching temperature of the steel plate is 900 ℃, the total heating time is 2.5min/mm, and the water quantity of the high-pressure section is 4000m 3 Cooling water to 23 ℃, tempering at 700 ℃, and carrying out heat treatment for 3.3min/mm to obtain the ultralow temperature container steel plate.
Example 4
The thickness of the steel plate of the ultralow temperature container in the embodiment is 80mm, and the steel plate consists of the following components in percentage by weight: 0.05% of C, 0.19% of Si, 1.15% of Mn, 0.005% of P, 0.002% of S, 0.004% of B, 0.18% of Cr, 0.17% of Mo, 0.018% of Nb, 0.32% of Ni, 0.018% of Ti, 0.10% of Cu, 0.02% of Zr, and the balance of Fe and inevitable impurities.
The production steps of the steel plate of the ultra-low temperature container in the embodiment are as follows:
(1) Smelting and continuous casting: and a converter or an electric furnace is adopted for primary smelting, and then the steel is refined by an LF furnace and is transported to a continuous casting steel casting platform for casting after VD vacuum treatment to obtain a continuous casting billet.
(2) A rolling procedure: heating to 1280 ℃ in a soaking furnace, and rolling after the heating time is 13 min/mm. The rolling process adopts II type controlled rolling, the initial rolling temperature of one stage is 1170 ℃, and the reduction rate of each pass is 11 percent; the initial rolling temperature of the two stages is 865 ℃, and the reduction rate of each pass is 10%.
(3) A heat treatment process: the quenching temperature of the steel plate is 910 ℃, the total heating time is 2.8min/mm, and the water quantity of the high-pressure section is 4100m 3 Cooling water to 24.5 ℃, tempering at 690 ℃, and carrying out heat treatment for 3.7min/mm of total heating time to obtain the ultralow temperature container steel plate.
Example 5
The thickness of the steel plate of the ultralow temperature container in the embodiment is 100mm, and the steel plate consists of the following components in percentage by weight: 0.06% of C, 0.20% of Si, 1.30% of Mn, 0.004% of P, 0.001% of S, 0.005% of B, 0.20% of Cr, 0.18% of Mo, 0.020% of Nb, 0.35% of Ni, 0.020% of Ti, 0.15% of Cu, 0.01% of Zr, and the balance of Fe and inevitable impurities.
The production steps of the steel plate of the ultra-low temperature container in the embodiment are as follows:
(1) Smelting and continuous casting: and a converter or an electric furnace is adopted for primary smelting, and then the steel is refined in an LF furnace and subjected to VD vacuum treatment, and then the steel is transported to a continuous casting steel casting platform for casting to obtain a continuous casting billet.
(2) A rolling procedure: heating to 1300 ℃ in a soaking pit furnace, and rolling after the heating time is 13 min/mm. The rolling process adopts II type controlled rolling, the initial rolling temperature of one stage is 1180 ℃, and the reduction rate of each pass is 12 percent; the second-stage rolling temperature is 870 ℃, and the reduction rate of each pass is 10%.
(3) A heat treatment process: the quenching temperature of the steel plate is 910 ℃, the total heating time is 3.0min/mm, and the water amount of the high-pressure section is 4200m 3 Cooling water to 25 ℃ at a/h, tempering at 685 ℃, and carrying out heat treatment for 4.0min/mm to obtain the ultralow-temperature container steel plate.
The grain size, the results of the inclusion analysis (1/2 part of the plate thickness) and the results of the mechanical property test (1/2 part of the plate thickness) of the steel sheets of examples 1 to 5 are shown in tables 1 and 2, respectively.
TABLE 1 results of inclusions and grain sizes of steel sheets of examples (as delivered)
TABLE 2 mechanical properties of the steel sheets of the examples
Note: except that the cold bending test state is a delivery state, the other normal temperature stretching, high temperature stretching and impact are all the performances after the die welding temperature is 650 ℃ and the heat preservation is carried out for 12 hours.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (8)
1. An ultra-low temperature container steel plate, its characterized in that: the chemical components and the weight percentage content are as follows: 0.05 to 0.09 percent of C, 0.15 to 0.20 percent of Si, 0.90 to 1.30 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.005 percent of B, 0.10 to 0.20 percent of Cr, 0.10 to 0.18 percent of Mo, 0.015 to 0.020 percent of Nb, 0.20 to 0.35 percent of Ni, 0.010 to 0.020 percent of Ti, less than 0.3 percent of Cu, less than or equal to 0.05 percent of Zr, and the balance of Fe and inevitable impurities.
2. The ultra-low-temperature container steel plate as set forth in claim 1, wherein: the thickness of the steel plate is 8-100mm.
3. The ultra-low-temperature container steel plate as set forth in claim 1, wherein: the single value of KV2 impact energy at the temperature of 60 ℃ below zero is more than 60 joules after the steel plate die welding temperature is 650 ℃ and the heat preservation is 12 hours.
4. The ultra-low-temperature container steel plate as set forth in claim 1, wherein: and d =2a,180 DEG after the steel plate is quenched and tempered and is cold-bent, and the appearance has no cracks, wherein d is the diameter of the bending core, and a is the thickness of the sample.
5. The ultra-low-temperature container steel plate as set forth in claim 1, wherein: the tensile yield strength Rp0.2 at the high temperature of 350 ℃ is more than or equal to 230MPa after the steel plate is subjected to heat preservation at the die welding temperature of 650 ℃ for 12 hours.
6. The method for manufacturing a steel plate for an ultra-low-temperature container as set forth in claim 1, wherein: the method comprises the working procedures of smelting, continuous casting, steel rolling and heat treatment, and comprises the following specific steps:
(1) Smelting and continuous casting: a converter or an electric furnace is adopted for primary smelting, and then the steel is refined by an LF furnace and is transported to a continuous casting steel casting platform for casting after VD vacuum treatment;
(2) A steel rolling procedure: heating to 1250-1300 ℃ in a soaking pit furnace, and rolling after the heating time is 11.5-13 min/mm;
(3) A heat treatment process: and quenching and tempering the steel plate to obtain the ultralow temperature container steel plate.
7. The manufacturing method of an ultra-low temperature container steel plate as set forth in claim 6, wherein: the steel rolling process adopts II-type controlled rolling, the rolling temperature at one stage is 1150-1180 ℃, and the reduction rate of each pass is 10-12%; the initial rolling temperature of the two stages is 840-870 ℃, and the reduction rate of each pass is 8-10%.
8. The manufacturing method of an ultra-low temperature container steel plate as set forth in claim 6 or 7, wherein: the quenching parameters in the heat treatment are as follows: the temperature is 880-910 deg.C, the total heating time is 2.0-3.0min/mm, and the high-pressure section water amount is 3800-4200m 3 Water cooling to 20-25 deg.c; the tempering parameters are as follows: 685-715 deg.C, and total heating time of 3.0-4.0min/mm.
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