CN113215487B - High-toughness quasi-sub-temperature quenched 09MnNiDR container steel and preparation method thereof - Google Patents
High-toughness quasi-sub-temperature quenched 09MnNiDR container steel and preparation method thereof Download PDFInfo
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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
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- 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
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- 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
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- 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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- 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
- C21D2211/002—Bainite
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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses high-toughness quasi-sub-temperature quenched 09MnNiDR container steel and a preparation method thereof, relating to the technical field of steel production, and comprising the following chemical components in percentage by mass: c is less than or equal to 0.10%, Si: 0.15-0.50%, Mn: 1.20-1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, Ni: 0.30-0.80%, Alt is more than or equal to 0.02%, Nb: less than or equal to 0.040%, V: less than or equal to 0.040%, Ti: less than or equal to 0.020%, Ca: 0.0010 to 0.0040 percent, and the balance of Fe and residual elements. Under the condition that the strength of the steel plate is not reduced, the core impact performance of the 09MnNiDR steel plate with the thickness of 40-80 mm is improved.
Description
Technical Field
The invention relates to the technical field of steel production, in particular to high-toughness quasi-sub-temperature quenching 09MnNiDR container steel and a preparation method thereof.
Background
09MnNiDR steel is steel for low-temperature pressure containers, and is mainly used for key parts of equipment used in industries such as petroleum, chemical engineering, power stations and the like. Therefore, the requirements on the low-temperature impact property and the internal quality of the 09MnNiDR steel plate are higher. In recent years, with the improvement of product quality, more and more production plants and customers have made higher demands on steel grades. For 09MnNiDR steel grade, the use of the steel grade is inevitably influenced by the core impact, and for 09MnNiDR steel for the thick-specification low-temperature pressure vessel, the requirement on the toughness uniformity of a through plate in the thickness direction is higher, so that the steel and equipment can be ensured to be suitable for various loads and low-temperature environments.
Patent CN 110029268A discloses a 09MnNiDR steel plate for a low-temperature pressure vessel with core-protecting low-temperature toughness and a manufacturing method thereof, wherein hot rolling and normalizing are mainly carried out to finally obtain a microstructure of ferrite and pearlite, and the steel plate has guaranteed-70 ℃ low-temperature impact toughness at 1/4 thickness and 1/2 thickness, but the elongation performance of the steel plate is not concerned; in addition, the normalizing heat treatment temperature is higher to 880 ℃.
The patent CN 104561783A discloses a low alloy steel 09MnNiDR steel plate for a container and a production method thereof, according to the method, the container steel with the impact energy of 250- & lt 70 & gt and 290J can be produced, but the normalizing temperature is higher and is 915 +/-15 ℃; meanwhile, it does not pay attention to the problem of the thickness impact toughness of the steel sheet 1/2.
Patent CN109440008A discloses a 09MnNiDR steel sheet for an ultra-low temperature pressure vessel, the thickness of the steel sheet is less than 121 mm. The steel is produced by adopting a conventional 'quenching and tempering' process, and the heat treatment process adopts longer tempering time to stabilize the performance of the steel.
Patent CN104451387A discloses a 09MnNiDR extra-thick low-temperature container plate and a production method thereof, wherein the thickness of the steel plate is 90-120mm, the normalizing and tempering heat treatment is adopted, and the finally obtained microstructure is ferrite and pearlite, and the overall mechanical property of the plate is general.
Therefore, the conventional 09MnNiDR steel plate for the low-temperature pressure vessel mostly adopts a normalizing process or a quenching and tempering process, and the problem of low impact performance at the thick part of 1/2 is rarely concerned. The impact performance of 1/2 thickness was individually noted, but the problems of the overall mechanical properties of the steel sheet (e.g. elongation) or the uniformity of the impact performance at different thicknesses of the steel sheet were not fully considered.
Disclosure of Invention
Aiming at the technical problems, the invention overcomes the defects of the prior art and provides the following chemical components in percentage by mass: c is less than or equal to 0.10%, Si: 0.15-0.50%, Mn: 1.20-1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, Ni: 0.30-0.80%, Alt is more than or equal to 0.02%, Nb: less than or equal to 0.040%, V: less than or equal to 0.040%, Ti: less than or equal to 0.020%, Ca: 0.0010 to 0.0040 percent, and the balance of Fe and residual elements;
the steel plate structure is granular bainite and a small amount of blocky ferrite.
The technical effects are as follows: the invention adopts a low-carbon design, reduces the content of brittle structure pearlite, ensures the strength of the steel plate by the granular bainite, and can improve the toughness of the steel plate by the block ferrite. Nickel is a pure solid solution element in steel, and has the function of obviously reducing the cold-brittleness transition temperature; the proper manganese content improves the strength of steel through solid solution strengthening, strictly limits the contents of sulfur and phosphorus, improves the toughness uniformity of the thickness of the through plate, and improves the impact performance of 1/2 thick parts. The steel plate has good overall mechanical property and relatively uniform impact property at-70 ℃ in the full thickness direction.
The technical scheme of the invention is further defined as follows:
the high-toughness quasi-sub-temperature quenched 09MnNiDR container steel has a steel plate thickness of 40-80 mm.
The high-toughness quasi-sub-temperature quenched 09MnNiDR container steel comprises the following chemical components in percentage by mass: c: 0.075-0.095%, Si: 0.15-0.30%, Mn: 1.25 to 1.40 percent of Ni, less than or equal to 0.013 percent of P, less than or equal to 0.008 percent of S, Ni: 0.49-0.79%, Alt: 0.025 to 0.040%, Nb: 0.015-0.035%, V: 0.015-0.035%, Ti: 0.008-0.018%, Ca: 0.0020 to 0.0035 percent, and the balance of Fe and residual elements.
The high-toughness quasi-sub-temperature quenched 09MnNiDR container steel comprises the following chemical components in percentage by mass: c: 0.065-0.085%, Si: 0.20-0.35%, Mn: 1.30-1.45%, P is less than or equal to 0.012%, S is less than or equal to 0.005%, Ni: 0.35-0.65%, Alt: 0.030 ~ 0.045%, Nb: 0.005-0.020%, V: 0.010-0.030%, Ti: 0.005-0.015%, Ca: 0.0018 to 0.0033 percent, and the balance of Fe and residual elements.
The high-toughness quasi-sub-temperature quenched 09MnNiDR container steel comprises the following chemical components in percentage by mass: c: 0.050-0.080%, Si: 0.28% -0.45%, Mn: 1.28-1.48%, P is less than or equal to 0.011%, S is less than or equal to 0.003%, Ni: 0.40% -0.70%, Alt: 0.028-0.048%, Nb: 0.020-0.040%, V: 0.002-0.020%, Ti: 0.002-0.012%, Ca: 0.0012 to 0.0025 percent, and the balance of Fe and residual elements. The chemical components and the mass percentage are as follows: c: 0.050-0.080%, Si: 0.28-0.45%, Mn: 1.28-1.48%, P is less than or equal to 0.011%, S is less than or equal to 0.003%, Ni: 0.40-0.70%, Alt: 0.028 to 0.048%, Nb: 0.020-0.040%, V: 0.002-0.020%, Ti: 0.002-0.012%, Ca: 0.0012 to 0.0025 percent, and the balance of Fe and residual elements.
The invention also aims to provide a preparation method of the high-toughness quasi-sub-temperature quenching 09MnNiDR container steel, which comprises the following steps:
a steel-making process: molten iron pretreatment desulfurization, converter deep dephosphorization and LF deep desulfurization, and ultralow As, Sb, Sn, Pb, Bi and B residual element control; obtaining 09MnNiDR steel casting blanks with center segregation of C0.5 and C1.0 grades by adopting a dynamic soft reduction and electromagnetic stirring technology;
a heating procedure: heating the casting blank in a heating furnace, wherein the heating coefficient is more than or equal to 10.0min/cm, the heating temperature is 1180-1220 ℃, and the heating uniformity of the casting blank is ensured;
a rolling procedure: adopting a 320mm large-section continuous casting billet and adopting a 2-stage controlled rolling process, wherein the rolling temperature of the first stage is 980-1150 ℃, and the initial rolling temperature of the second stage is less than or equal to 840 ℃;
a cooling process: naturally cooling the rolled steel plate in the air, and then stacking and slowly cooling the steel plate for more than 72 hours;
a heat treatment process: carrying out quasi-sub-temperature quenching and tempering treatment on the steel plate after the reactor cooling, wherein the quenching heating temperature is Ac 3 The quenching heating and heat preservation time is calculated by 1.8-2.5 min/mm at the temperature of 5-10 ℃; the tempering heating temperature is 550-650 ℃, and the tempering heating and heat preservation time is calculated by 2.5-3.5 min/mm.
According to the preparation method of the high-toughness quasi-sub-temperature quenching 09MnNiDR container steel, the post-fracture elongation of the steel plate is more than or equal to 30 percent, and the 1/4-70 ℃ impact absorption energy is more than or equal to 310J/cm at the thick part 2 The impact absorption energy at the 1/2 thick position at-70 ℃ is more than or equal to 290J/cm 2 The impact fracture is represented by a complex morphology of dimple and quasisplitting fracture.
The invention has the beneficial effects that:
(1) the invention adopts the design of low alloy cost, less Mn and Ni components, less Nb and low raw material cost;
(2) according to the invention, a 320mm large-section casting blank is adopted, and the compactness of the core of the steel plate is improved by a larger compression ratio, so that the low-temperature impact toughness of the core of the material is improved;
(3) the invention adopts the technology of 'control rolling + air cooling stacking after rolling', reasonably distributes rolling passes and pass reduction rate, improves the performance of a rolled steel plate as much as possible, and simultaneously ensures the uniformity of the steel plate in the thickness direction;
(4) the invention can reserve part of a small amount of ferrite tissues obtained before the sub-temperature quenching to achieve the purpose of improving the impact performance of the core, the impact absorption energy of the tempered 1/2 sample is basically equivalent to that of the 1/4 sample, and the impact fracture of the 1/2 sample has a composite appearance of a dimple and a quasi-cleavage fracture.
Drawings
FIG. 1 shows the microstructure at 1/4;
FIG. 2 shows the microstructure at 1/2 of the steel plate thickness.
Detailed Description
Example 1
The high-toughness quasi-sub-temperature quenched 09MnNiDR container steel provided by the embodiment has a thickness of 80mm, and comprises the following chemical components in percentage by mass: c: 0.095%, Si: 0.34%, Mn: 1.45%, P is less than or equal to 0.008%, S is less than or equal to 0.002%, Ni: 0.78%, Alt is more than or equal to 0.035%, Nb: 0.023%, V: 0.006%, Ti: 0.005%, Ca: 0.0016%, and the balance of Fe and residual elements.
The preparation method comprises the following steps:
a steel making process: s after the pretreatment of molten iron: 0.006%, deep dehydration in a converter: 0.006%, S after LF deep desulfurization: 0.001 percent and ultra-low As, Sb, Sn, Pb, Bi and B residual elements; molten iron with qualified components is used as a raw material for smelting, and alloy is added in the molten steel smelting process to avoid increase of residual elements; after RH is finished, the temperature of the molten steel is 1545 ℃, the superheat degree of the molten steel is controlled to be 12-19 ℃, the continuous casting adopts the dynamic soft reduction and electromagnetic stirring technology, and the center segregation of a casting blank with the thickness of 320mm is C0.5 level;
a heating procedure: heating the casting blank in a heating furnace, wherein the heating coefficient is more than or equal to 10.3min/cm, the heating temperature is 1195 ℃, and the temperature is kept for 62min in a soaking section, so that the heating uniformity of the casting blank is ensured;
a rolling procedure: a 2-stage controlled rolling process is adopted, the rolling finishing temperature of the first stage is 1008 ℃, and the final 2-pass rolling reduction of the first stage is 30mm and 28 mm; the second stage has the initial rolling temperature of 828 ℃ and the final rolling temperature of 805 ℃;
a cooling process: naturally cooling the rolled steel plate in the air, and then stacking and slowly cooling the steel plate at the stacking temperature of 550 ℃ for 76 hours;
a heat treatment process: carrying out quasi-sub-temperature quenching and tempering treatment on the steel plate after the reactor cooling, wherein the quenching heating temperature is 865 ℃, and the quenching heating and heat preservation time is 152 min; the tempering heating temperature is 620 ℃, and the tempering heating and heat preservation time is 208 min.
The mechanical properties of the steel plate are as follows: yield strength 382MPa, tensile strength 526MPa, and elongation after fracture 31%; impact toughness at each position in the thickness direction at-70 ℃: 1/4 the impact toughness of the thick part is 317J/cm 2 1/2 thick part with impact toughness of 294J/cm 2 。
Example 2
The high-toughness quasi-sub-temperature quenched 09MnNiDR container steel provided by the embodiment has a thickness of 65mm, and comprises the following chemical components in percentage by mass: c: 0.07%, Si: 0.24%, Mn: 1.35 percent, less than or equal to 0.012 percent of P, less than or equal to 0.002 percent of S, Ni: 0.56%, Alt: 0.032%, Nb: 0.015%, V: 0.005%, Ti: 0.008%, Ca: 0.0020% and the balance of Fe and residual elements.
The preparation method comprises the following steps:
a steel making process: after the pretreatment of molten iron S: 0.005%, deep de-P of the converter: 0.010%, S after LF deep desulfurization: 0.0015 percent of ultra-low As, Sb, Sn, Pb, Bi and B residual elements; molten iron with qualified components is used as a raw material for smelting, and alloy is added in the molten steel smelting process to avoid increase of residual elements; after RH is finished, the temperature of the molten steel is 1545 ℃, the superheat degree of the molten steel is controlled to be 12-19 ℃, the continuous casting adopts the dynamic soft reduction and electromagnetic stirring technology, and the center segregation of a casting blank with the thickness of 320mm is C1.0 level;
a heating procedure: heating the casting blank in a heating furnace, wherein the heating coefficient is more than or equal to 10.3min/cm, the heating temperature is 1205 ℃, and the heat preservation time of a soaking section is 60min, so that the heating uniformity of the casting blank is ensured;
a rolling procedure: a 2-stage controlled rolling process is adopted, the final rolling temperature of the first stage is 1015 ℃, and the final 2-pass rolling reduction of the stage is 32mm and 29 mm; the second stage is at initial rolling temperature of 832 ℃ and final rolling temperature of 810 ℃;
a cooling process: naturally cooling the rolled steel plate in the air, and then stacking and slowly cooling the steel plate at the stacking temperature of 527 ℃ for 73 hours;
a heat treatment process: carrying out quasi-sub-temperature quenching and tempering treatment on the steel plate after the stacking cooling, wherein the quenching heating temperature is 864 ℃, and the quenching heating and heat preservation time is 124 min; the tempering heating temperature is 630 ℃, and the tempering heating and heat preservation time is 185 min.
The mechanical properties of the steel plate are as follows: the yield strength is 375MPa, the tensile strength is 518MPa, and the elongation after fracture is 31 percent; impact toughness at each position in the thickness direction at-70 ℃: 1/4 thick part with impact toughness of 315J/cm 2 1/2 the thick part has an impact toughness of 286J/cm 2 。
Example 3
The high-toughness quasi-sub-temperature quenched 09MnNiDR container steel provided by the embodiment has a thickness of 40mm, and comprises the following chemical components in percentage by mass: c: 0.05%, Si: 0.18%, Mn: 1.28%, P is less than or equal to 0.014%, S is less than or equal to 0.005%, Ni: 0.48%, Alt: 0.025%, Nb: 0.004%, V: 0.025%, Ti: 0.003%, Ca: 0.0018 percent, and the balance of Fe and residual elements.
The preparation method comprises the following steps:
a steel-making process: after the pretreatment of molten iron S: 0.005%, converter deep dehydration P: 0.010%, S after LF deep desulfurization: 0.002%, and ultra-low As, Sb, Sn, Pb, Bi and B residual elements; qualified molten iron is used as a raw material for smelting, and alloy is added in the molten steel smelting process to avoid increase of residual elements; after RH is finished, the temperature of the molten steel is 1545 ℃, the superheat degree of the molten steel is controlled to be 12-19 ℃, the continuous casting adopts the dynamic soft reduction and electromagnetic stirring technology, and the center segregation of a casting blank with the thickness of 320mm is C1.0 level;
a heating procedure: heating the casting blank in a heating furnace, wherein the heating coefficient is more than or equal to 10.3min/cm, the heating temperature is 1217 ℃, and the temperature of a soaking section is kept for 62min, so that the heating uniformity of the casting blank is ensured;
a rolling procedure: a 2-stage controlled rolling process is adopted, the rolling finishing temperature of the first stage is 1007 ℃, and the final 2-pass rolling reduction of the stage is 31mm and 29 mm; the second stage has the initial rolling temperature of 838 ℃ and the final rolling temperature of 802 ℃;
a cooling process: naturally cooling the rolled steel plate in the air, and then stacking and slowly cooling the steel plate, wherein the stacking temperature is 485 ℃, and the stacking time is 74 hours;
a heat treatment process: carrying out quasi-sub-temperature quenching and tempering treatment on the steel plate after the reactor cooling, wherein the quenching heating temperature is 860 ℃, and the quenching heating and heat preservation time is 81 min; the tempering heating temperature is 637 ℃, and the tempering heating and heat preservation time is 118 min.
The mechanical properties of the steel plate are as follows: the yield strength is 395MPa, the tensile strength is 524MPa, and the elongation after fracture is 30.5 percent; -70 ℃ impact toughness at various positions in the thickness direction: 1/4 thick part with impact toughness 322J/cm 2 1/2 the thick part has an impact toughness of 304J/cm 2 。
The invention obtains the steel plate with the microstructure of ferrite and granular bainite by component design, controlled rolling technology, dump cooling after rolling and proper 'quasi-sub-temperature quenching and tempering' process, as shown in figures 1 and 2. Under the condition that the strength of the steel plate is not reduced, the core impact performance of a 09MnNiDR steel plate with the thickness of 40-80 mm is improved, and the impact absorption energy of the 1/4 thick part of the steel plate is more than or equal to 310J/cm 2 1/2 the thick impact absorption energy is not less than 294J/cm 2 And the elongation after fracture is more than or equal to 30 percent.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. A high-toughness quasi-sub-temperature quenching 09MnNiDR container steel is characterized in that: the chemical components and mass percentage are as follows: c is less than or equal to 0.10%, Si: 0.15-0.50%, Mn: 1.20-1.60%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, Ni: 0.30-0.80%, Alt is more than or equal to 0.02%, Nb: less than or equal to 0.040%, V: less than or equal to 0.040%, Ti: less than or equal to 0.020%, Ca: 0.0010 to 0.0040 percent, and the balance of Fe and residual elements;
the preparation method comprises the following steps:
a steel-making process: molten iron pretreatment desulfurization, converter deep dephosphorization, LF deep desulfurization, and ultralow As, Sb, Sn, Pb, Bi and B residual element control; obtaining a 09MnNiDR steel casting blank with the center segregation of C0.5 and C1.0 grades by adopting a dynamic soft reduction and electromagnetic stirring technology;
a heating procedure: heating the casting blank in a heating furnace, wherein the heating coefficient is more than or equal to 10.0min/cm, the heating temperature is 1180-1220 ℃, and the heating uniformity of the casting blank is ensured;
a rolling procedure: adopting a 320mm large-section continuous casting billet and adopting a 2-stage controlled rolling process, wherein the rolling temperature of the first stage is 980-1150 ℃, and the initial rolling temperature of the second stage is less than or equal to 840 ℃;
a cooling process: naturally cooling the rolled steel plate in the air, and then stacking and slowly cooling the steel plate for more than 72 hours;
a heat treatment process: carrying out quasi-sub-temperature quenching and tempering treatment on the steel plate after the stack cooling, wherein the quenching heating temperature is Ac 3 The quenching heating and heat preservation time is calculated by 1.8-2.5 min/mm at the temperature of 5-10 ℃; the tempering heating temperature is 550-650 ℃, and the tempering heating and heat preservation time is calculated by 2.5-3.5 min/mm;
the steel plate structure is granular bainite and a small amount of massive ferrite.
2. A high toughness quasi-sub-temperature quenched 09MnNiDR vessel steel as claimed in claim 1, wherein: the thickness of the steel plate is 40-80 mm.
3. A high toughness quasi-sub-temperature quenched 09MnNiDR vessel steel as claimed in claim 1, wherein: the chemical components and the mass percentage are as follows: c: 0.075-0.095%, Si: 0.15-0.30%, Mn: 1.25 to 1.40 percent of Ni, less than or equal to 0.013 percent of P, less than or equal to 0.008 percent of S, Ni: 0.49% -0.79%, Alt: 0.025 to 0.040%, Nb: 0.015-0.035%, V: 0.015-0.035%, Ti: 0.008-0.018%, Ca: 0.0020 to 0.0035 percent, and the balance of Fe and residual elements.
4. A high toughness quasi-sub-temperature quenched 09MnNiDR vessel steel as claimed in claim 1, wherein: the chemical components and the mass percentage are as follows: c: 0.065-0.085%, Si: 0.20-0.35%, Mn: 1.30-1.45%, P is less than or equal to 0.012%, S is less than or equal to 0.005%, Ni: 0.35-0.65%, Alt: 0.030-0.045%, Nb: 0.005-0.020%, V: 0.010-0.030%, Ti: 0.005-0.015%, Ca: 0.0018 to 0.0033 percent, and the balance of Fe and residual elements.
5. A high toughness quasi-sub-temperature quenched 09MnNiDR vessel steel as claimed in claim 1, wherein: the chemical components and the mass percentage are as follows: c: 0.050-0.080%, Si: 0.28% -0.45%, Mn: 1.28-1.48%, P is less than or equal to 0.011%, S is less than or equal to 0.003%, Ni: 0.40% -0.70%, Alt: 0.028-0.048%, Nb: 0.020 to 0.040%, V: 0.002-0.020%, Ti: 0.002-0.012%, Ca: 0.0012 to 0.0025 percent, and the balance of Fe and residual elements.
6. A high toughness quasi-sub-temperature quenched 09MnNiDR vessel steel as claimed in claim 1, wherein: the elongation of the steel plate after fracture is more than or equal to 30 percent, and the impact absorption energy of the steel plate at the 1/4 thick position at minus 70 ℃ is more than or equal to 310J/cm 2 The impact absorption energy at the 1/2 thick position at-70 ℃ is more than or equal to 290J/cm 2 The impact fracture is represented by a complex morphology of dimple and quasisplitting fracture.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110416155.3A CN113215487B (en) | 2021-04-19 | 2021-04-19 | High-toughness quasi-sub-temperature quenched 09MnNiDR container steel and preparation method thereof |
| PCT/CN2021/108094 WO2022222294A1 (en) | 2021-04-19 | 2021-07-23 | High-toughness quasi-sub-temperature quenched 09mnnidr container steel and preparation method therefor |
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| CN116145033B (en) * | 2022-12-30 | 2024-02-02 | 北京科技大学 | Ultrahigh-toughness low-temperature pressure vessel steel plate and preparation method thereof |
| CN116815074B (en) * | 2023-06-07 | 2024-02-09 | 北京科技大学 | High-strength and high-toughness Q690F super-thick weather-resistant steel plate with excellent thickness uniformity and preparation method thereof |
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| US5352304A (en) * | 1992-11-16 | 1994-10-04 | Allegheny Ludlum Corporation | High strength low alloy steel |
| CN101876001A (en) * | 2009-11-25 | 2010-11-03 | 首钢总公司 | Method for improving low-temperature impact toughness of high strength thick steel plate |
| KR101271885B1 (en) * | 2010-12-22 | 2013-06-05 | 주식회사 포스코 | High strength steel plate having excellent toughness and method for producing the same |
| CN102345066B (en) * | 2011-10-21 | 2013-06-19 | 莱芜钢铁集团有限公司 | Steel used for pressure container and preparation method thereof |
| CN103820610B (en) * | 2012-11-19 | 2016-04-06 | 上海重型机器厂有限公司 | Improve the property heat treatment method of nuclear power container heavy froging obdurability |
| CN104561783A (en) * | 2014-12-26 | 2015-04-29 | 南阳汉冶特钢有限公司 | Low alloy steel 09MnNiDR steel plate for vessel and production method thereof |
| CN104911319B (en) * | 2015-05-20 | 2017-11-10 | 舞阳钢铁有限责任公司 | Low temperature spherical tank steel plate for container and its production method |
| CN105886909B (en) * | 2016-04-19 | 2017-08-11 | 江阴兴澄特种钢铁有限公司 | A kind of resistance against hydrogen cracking steel plate of pressure vessel and its manufacture method |
| CN105925895B (en) * | 2016-06-23 | 2018-03-09 | 宝山钢铁股份有限公司 | Strain resistant initial aging stage is with eliminating the special thick 600MPa levels hardened and tempered steel plate of residual stress Annealing Embrittlement and its manufacture method |
| CN108085604A (en) * | 2017-11-29 | 2018-05-29 | 南京钢铁股份有限公司 | Ocean engineering low-temperature flexibility S355G10+M Wide and Heavy Plates and its production method |
| CN110184531A (en) * | 2018-07-20 | 2019-08-30 | 江阴兴澄特种钢铁有限公司 | The tank plate and its manufacturing method of a kind of thick easily welding center portion excellent in low temperature toughness of 40-60mm |
| CN109440008A (en) * | 2018-12-03 | 2019-03-08 | 南阳汉冶特钢有限公司 | A kind of ultralow temperature pressure vessel 09MnNiDR steel plate and its production method |
| CN111270149B (en) * | 2020-03-30 | 2021-11-19 | 南京钢铁股份有限公司 | Production method of ultralow-temperature high-center impact large-thickness 13MnNi6-3 container steel |
| CN111996437B (en) * | 2020-07-11 | 2022-05-31 | 江阴兴澄特种钢铁有限公司 | Production method of large-thickness high-toughness ultrahigh-strength steel plate with yield strength of 1100MPa |
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