CN109136769B - QT process-based low-nickel steel plate for LNG storage tank and preparation method thereof - Google Patents
QT process-based low-nickel steel plate for LNG storage tank 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
- 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
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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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- 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
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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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C21D2211/008—Martensite
Abstract
The low-nickel type steel plate for the LNG storage tank based on the QT process comprises the following chemical components in percentage by mass: c: 0.03-0.06%, Si: 0.02 to 0.12%, Mn: 0.52-0.98%, Ni: 5.72-6.64%, P is less than or equal to 0.006%, S is less than or equal to 0.005%, Mo: 0.13-0.32%, and the balance of Fe and inevitable impurities. The preparation method comprises the following steps: selecting raw materials according to the components, smelting, and casting into an ingot; heating the cast ingot, and performing two-stage controlled rolling after heat preservation; air cooling to below 200 ℃ after rolling; and then carrying out quenching (Q) treatment and tempering (T) treatment, and carrying out water cooling or air cooling to room temperature after discharging to obtain the low-nickel type steel plate for the LNG storage tank, wherein the thickness of the steel plate is 12-20 mm.
Description
Technical Field
The invention belongs to the field of alloy steel manufacturing, and particularly relates to a low-nickel type steel plate for an LNG storage tank based on a QT process and a preparation method thereof.
background
With the rapid increase of global energy consumption, the excessive dependence on coal causes serious air pollution, and the large-scale use of clean energy natural gas becomes a necessary development trend. The natural gas is liquefied at the temperature of 163 ℃ below zero and normal pressure to form liquefied natural gas, the volume of the liquefied natural gas is about 1/625 of the volume of the same amount of gaseous natural gas, and the liquefied natural gas is convenient to store and transport economically and safely. The steel plate for the LNG (liquefied natural gas) storage tank is required to have high strength and good ultralow temperature (-196 ℃) toughness.
for a long time, the steel plate for the liquefied natural gas storage tank is mainly 9% Ni steel, the Ni content is 8.5-10%, the yield strength is not less than 590MPa, the tensile strength is 680-820 MPa, the transverse impact energy at-196 ℃ is not less than 80J, and the performance completely meets the construction requirement of the large land-based liquefied natural gas storage tank. However, in recent years, the price of Ni has been increasing, and it is necessary to develop a steel sheet for a low-nickel type lng tank instead of 9% Ni steel, thereby saving the amount of expensive alloy Ni and reducing the construction cost of the lng tank.
Patent CN104674110 discloses a low-temperature steel plate for pressure vessels and a production method thereof, wherein 6.8-8.0% of Ni and 0.01-0.09% of Nb are added during component design, so that the cost is still high; patent CN105543694 discloses a preparation method of a 7Ni steel plate for a liquefied natural gas storage tank, wherein 6.8-7.3% of Ni and 0.30-0.70% of Cr are added in the component design, and the cost is still high; the patent CN104988404 discloses a low-nickel steel plate for a pressure vessel under the low temperature condition of-196 ℃ and a production method thereof, wherein 1.60-2.50% of Mn, 0.35-0.50% of Cu and 0.55-1.00% of Cr are added in the component design, and the cost is still high.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a low-nickel type steel plate for an LNG storage tank based on a QT process and a preparation method thereof.
The low-nickel steel plate for the LNG storage tank comprises the following chemical components in percentage by mass: c: 0.03-0.06%, Si: 0.02 to 0.12%, Mn: 0.52-0.98%, Ni: 5.72-6.64%, P is less than or equal to 0.006%, S is less than or equal to 0.005%, Mo: 0.13-0.32%, and the balance of Fe and inevitable impurities.
the structure of the low-nickel steel plate for the LNG storage tank is tempered martensite and 5.3-9.2% of reversed austenite.
the thickness of the steel plate for the low-nickel LNG storage tank is 12-20 mm, the tensile strength is 698-762 MPa, the yield strength is 622-715 MPa, the elongation after fracture is 22.6-27.3%, and the transverse impact energy at the temperature of-196 ℃ is 184-257J.
The preparation method of the low-nickel LNG storage tank steel plate based on the QT process comprises the following process steps:
(1) Smelting by adopting a vacuum induction furnace, and casting into an ingot, wherein the ingot comprises the following components in percentage by mass: c: 0.03-0.06%, Si: 0.02 to 0.12%, Mn: 0.52-0.98%, Ni: 5.72-6.64%, P is less than or equal to 0.006%, S is less than or equal to 0.005%, Mo: 0.13-0.32%, and the balance of Fe and inevitable impurities;
(2) Heating the cast ingot to 1100-1200 ℃, and performing two-stage controlled rolling after heat preservation for 1-2 hours;
(3) carrying out 3-4 times of rough rolling in an austenite recrystallization zone, wherein the initial rolling temperature is 1050-1130 ℃, and the total accumulated reduction rate is 53.8-63.8%, so as to obtain an intermediate blank;
(4) carrying out 4-5 times of finish rolling in an austenite non-recrystallization region, wherein the initial rolling temperature is 800-870 ℃, the total accumulated reduction rate is 66.7-74.5%, and the final rolling temperature is 760-820 ℃ to obtain a hot rolled plate with the thickness of 12-20 mm;
(5) After rolling, the hot rolled plate is cooled to below 200 ℃ in air;
(6) Quenching (Q) treatment: heating the hot rolled plate to 760-880 ℃, preserving heat for 25-70 min, and then quenching to below 200 ℃ to obtain a quenched steel plate;
(7) tempering (T): and heating the quenched steel plate to 590-640 ℃, tempering for 40-120 min, and cooling with water or air to room temperature after discharging to obtain the low-nickel type steel plate for the LNG storage tank with the thickness of 12-20 mm.
The preparation method of the low-nickel type steel plate for the LNG storage tank based on the QT process comprises the following steps:
in the steps (1) and (2), the thickness of the cast ingot is 130 mm.
In the step (3), the single-pass reduction rate of the rough rolling is 19.2-25.3%.
in the step (3), the thickness of the intermediate blank is 47-60 mm.
in the step (4), the single-pass reduction rate of the finish rolling is 20.0-27.7%.
Compared with the prior art, the invention has the advantages that:
(1) In the components, besides four additive elements of C, Si, Mn and Ni, only a small amount of Mo element is added, so that the alloy cost is further reduced;
(2) an air cooling mode is adopted after rolling, an accelerated cooling device after rolling is not needed, the process is simple and convenient, and the realization is easy;
(3) Adopting a QT heat treatment mode to obtain 5.3-9.2% of reversed austenite, so that the-196 ℃ impact toughness of the low-nickel steel plate is ensured;
(4) The tensile strength of the prepared low-nickel LNG storage tank steel plate is 698-762 MPa, the yield strength is 622-715 MPa, the elongation after fracture is 22.6-27.3%, the transverse impact energy at minus 196 ℃ is 184-257J, and the level of 9% Ni steel is achieved.
drawings
Fig. 1 is a photograph showing the structure of a steel sheet for a low-nickel type LNG storage tank, prepared in example 1 of the present invention;
Fig. 2 is a tensile curve of a steel sheet for a low-nickel type LNG storage tank, prepared in example 1 of the present invention.
Detailed Description
the present invention is further illustrated by the following examples, but the scope of the present invention is not limited to the following examples.
Example 1
the low-nickel type LNG steel sheet for storage tank based on QT technology of this embodiment, its chemical composition is according to mass percent: c: 0.05%, Si: 0.05%, Mn: 0.81%, Ni: 6.25%, P: 0.005%, S: 0.004%, Mo: 0.22%, and the balance of Fe and inevitable impurities.
a preparation method of a low-nickel type steel plate for an LNG storage tank based on a QT process comprises the following process steps:
(1) Smelting by using a vacuum induction furnace, and casting into an ingot with the thickness of 130mm, wherein the ingot comprises the following components in percentage by mass: c: 0.05%, Si: 0.05%, Mn: 0.81%, Ni: 6.25%, P: 0.005%, S: 0.004%, Mo: 0.22%, the balance being Fe and unavoidable impurities;
(2) heating the cast ingot to 1150 ℃, and performing two-stage controlled rolling after heat preservation for 1.5 h;
(3) carrying out 4-pass rough rolling in an austenite recrystallization zone, wherein the initial rolling temperature is 1090 ℃, the reduction pass distribution is 130mm → 105mm → 83mm → 62mm → 47mm, and the total cumulative reduction rate is 63.8%, so as to obtain an intermediate blank with the thickness of 47 mm;
(4) performing 4-pass finish rolling in an austenite non-recrystallization zone, wherein the initial rolling temperature is 820 ℃, the reduction pass distribution is 47mm → 34mm → 25mm → 19mm → 15mm, the total cumulative reduction rate is 68.1%, and the final rolling temperature is 780 ℃ to obtain a hot rolled plate with the thickness of 15 mm;
(5) after rolling, the hot rolled plate is cooled to below 200 ℃ in air;
(6) quenching (Q) treatment: heating the hot rolled plate to 800 ℃, preserving heat for 50min, and then quenching to below 200 ℃ to obtain a quenched steel plate;
(7) Tempering (T): and heating the quenched steel plate to 630 ℃ for tempering, wherein the tempering time is 60min, and cooling the steel plate to room temperature by water after discharging to obtain the low-nickel type steel plate for the LNG storage tank, wherein the thickness of the steel plate is 15 mm.
The structure of the low-nickel LNG storage tank steel plate with the thickness of 15mm is tempered martensite and 7.8% of reversed austenite; the tensile strength is 705MPa, the yield strength is 651MPa, the elongation after fracture is 25.8 percent, and the transverse impact energy at the temperature of minus 196 ℃ is 239J. A photograph of the structure of the low nickel type steel sheet for LNG storage tanks prepared in example 1 is shown in fig. 1; the tensile curve of the low nickel type steel sheet for LNG storage tanks prepared in example 1 is shown in fig. 2.
Example 2
the low-nickel type LNG steel sheet for storage tank based on QT technology of this embodiment, its chemical composition is according to mass percent: c: 0.06%, Si: 0.12%, Mn: 0.98%, Ni: 6.64%, P: 0.006%, S: 0.003%, Mo: 0.13%, and the balance of Fe and inevitable impurities.
A preparation method of a low-nickel type steel plate for an LNG storage tank based on a QT process comprises the following process steps:
(1) smelting by using a vacuum induction furnace, and casting into an ingot with the thickness of 130mm, wherein the ingot comprises the following components in percentage by mass: c: 0.06%, Si: 0.12%, Mn: 0.98%, Ni: 6.64%, P: 0.006%, S: 0.003%, Mo: 0.13%, the balance being Fe and unavoidable impurities;
(2) Heating the cast ingot to 1200 ℃, and performing two-stage controlled rolling after heat preservation for 1 h;
(3) Carrying out 3-pass rough rolling in an austenite recrystallization zone, wherein the initial rolling temperature is 1130 ℃, the reduction pass distribution is 130mm → 105mm → 80mm → 60mm, and the total cumulative reduction rate is 53.8% to obtain an intermediate blank with the thickness of 60 mm;
(4) Performing 4-pass finish rolling in an austenite non-recrystallization zone, wherein the initial rolling temperature is 870 ℃, the reduction pass distribution is 60mm → 44mm → 32mm → 25mm → 20mm, the total cumulative reduction rate is 66.7%, and the final rolling temperature is 820 ℃ to obtain a hot rolled plate with the thickness of 20 mm;
(5) After rolling, the hot rolled plate is cooled to below 200 ℃ in air;
(6) Quenching (Q) treatment: heating the hot rolled plate to 760 ℃, preserving heat for 70min, and then quenching to below 200 ℃ to obtain a quenched steel plate;
(7) tempering (T): and heating the quenched steel plate to 640 ℃ for tempering, wherein the tempering time is 40min, and cooling the steel plate to room temperature by water after discharging to obtain the low-nickel type steel plate for the LNG storage tank, wherein the thickness of the steel plate is 20 mm.
The structure of the low-nickel LNG storage tank steel plate with the thickness of 20mm is tempered martensite and 9.2% of reversed austenite; the tensile strength is 698MPa, the yield strength is 622MPa, the elongation after fracture is 27.3 percent, and the transverse impact energy at minus 196 ℃ is 257J.
example 3
the low-nickel type LNG steel sheet for storage tank based on QT technology of this embodiment, its chemical composition is according to mass percent: c: 0.03%, Si: 0.02%, Mn: 0.52%, Ni: 5.72%, P: 0.004%, S: 0.005%, Mo: 0.32%, and the balance of Fe and inevitable impurities.
a preparation method of a low-nickel type steel plate for an LNG storage tank based on a QT process comprises the following process steps:
(1) Smelting by using a vacuum induction furnace, and casting into an ingot with the thickness of 130mm, wherein the ingot comprises the following components in percentage by mass: c: 0.03%, Si: 0.02%, Mn: 0.52%, Ni: 5.72%, P: 0.004%, S: 0.005%, Mo: 0.32%, the balance being Fe and unavoidable impurities;
(2) Heating the cast ingot to 1100 ℃, and performing two-stage controlled rolling after heat preservation for 2 hours;
(3) Carrying out 4-pass rough rolling in an austenite recrystallization zone, wherein the initial rolling temperature is 1050 ℃, the reduction pass distribution is 130mm → 105mm → 83mm → 62mm → 47mm, and the total cumulative reduction rate is 63.8%, so as to obtain an intermediate blank with the thickness of 47 mm;
(4) Carrying out 5-pass finish rolling in an austenite non-recrystallization area, wherein the initial rolling temperature is 800 ℃, the reduction pass distribution is 47mm → 34mm → 25mm → 19mm → 15mm → 12mm, the total cumulative reduction rate is 74.5%, and the final rolling temperature is 760 ℃, so as to obtain a hot rolled plate with the thickness of 12 mm;
(5) after rolling, the hot rolled plate is cooled to below 200 ℃ in air;
(6) quenching (Q) treatment: heating the hot rolled plate to 880 ℃, preserving heat for 25min, and then quenching to below 200 ℃ to obtain a quenched steel plate;
(7) Tempering (T): and heating the quenched steel plate to 590 ℃ for tempering, wherein the tempering time is 120min, and after discharging, air-cooling to room temperature to obtain the low-nickel type steel plate for the LNG storage tank, wherein the thickness of the low-nickel type steel plate is 12 mm.
the structure of the low-nickel LNG storage tank steel plate with the thickness of 12mm is tempered martensite and 5.3 percent of reversed austenite; the tensile strength is 762MPa, the yield strength is 715MPa, the elongation after fracture is 22.6 percent, and the transverse impact energy at the temperature of minus 196 ℃ is 184J.
example 4
The low-nickel type LNG steel sheet for storage tank based on QT technology of this embodiment, its chemical composition is according to mass percent: c: 0.04%, Si: 0.07%, Mn: 0.73%, Ni: 6.01%, P: 0.006%, S: 0.005%, Mo: 0.25%, and the balance of Fe and inevitable impurities.
a preparation method of a low-nickel type steel plate for an LNG storage tank based on a QT process comprises the following process steps:
(1) Smelting by using a vacuum induction furnace, and casting into an ingot with the thickness of 130mm, wherein the ingot comprises the following components in percentage by mass: c: 0.04%, Si: 0.07%, Mn: 0.73%, Ni: 6.01%, P: 0.006%, S: 0.005%, Mo: 0.25%, the balance being Fe and unavoidable impurities;
(2) heating the cast ingot to 1130 ℃, and performing two-stage controlled rolling after heat preservation for 2 hours;
(3) Carrying out 4-pass rough rolling in an austenite recrystallization zone, wherein the initial rolling temperature is 1070 ℃, the reduction pass distribution is 130mm → 105mm → 83mm → 62mm → 47mm, and the total cumulative reduction rate is 63.8 percent, so as to obtain an intermediate blank with the thickness of 47 mm;
(4) Performing 5-pass finish rolling in an austenite non-recrystallization area, wherein the initial rolling temperature is 840 ℃, the reduction pass distribution is 47mm → 34mm → 25mm → 19mm → 15mm → 12mm, the total cumulative reduction rate is 74.5%, and the final rolling temperature is 790 ℃, so as to obtain a hot rolled plate with the thickness of 12 mm;
(5) After rolling, the hot rolled plate is cooled to below 200 ℃ in air;
(6) Quenching (Q) treatment: heating the hot rolled plate to 820 ℃, preserving heat for 40min, and then quenching to below 200 ℃ to obtain a quenched steel plate;
(7) Tempering (T): and heating the quenched steel plate to 610 ℃ for tempering, wherein the tempering time is 100min, and after discharging, air-cooling to room temperature to obtain the low-nickel type steel plate for the LNG storage tank, wherein the thickness of the low-nickel type steel plate is 12 mm.
the structure of the low-nickel LNG storage tank steel plate with the thickness of 12mm is tempered martensite and 7.4% of reversed austenite; the tensile strength is 732MPa, the yield strength is 685MPa, the elongation after fracture is 23.9 percent, and the transverse impact energy at minus 196 ℃ is 218J.
Claims (3)
1. the low-nickel LNG storage tank steel plate based on the QT process is characterized by comprising the following chemical components in percentage by mass: c: 0.04-0.06%, Si: 0.05-0.12%, Mn: 0.73-0.98%, Ni: 6.01-6.64%, P is less than or equal to 0.006%, S is less than or equal to 0.005%, Mo: 0.13-0.25%, and the balance of Fe and inevitable impurities; the structure is tempered martensite and 7.4-9.2% of reversed austenite; the thickness is 12-20 mm, the tensile strength is 698-732 MPa, the yield strength is 622-685 MPa, the elongation after fracture is 23.9-27.3%, and the transverse impact energy at the temperature of minus 196 ℃ is 218-257J.
2. The method for preparing the low-nickel type steel plate for the LNG storage tank based on the QT process of claim 1, characterized by comprising the following process steps:
(1) smelting by adopting a vacuum induction furnace, and casting into an ingot, wherein the ingot comprises the following components in percentage by mass: c: 0.04-0.06%, Si: 0.05-0.12%, Mn: 0.73-0.98%, Ni: 6.01-6.64%, P is less than or equal to 0.006%, S is less than or equal to 0.005%, Mo: 0.13-0.25%, and the balance of Fe and inevitable impurities;
(2) Heating the cast ingot to 1130-1200 ℃, and performing two-stage controlled rolling after heat preservation for 1-2 hours;
(3) carrying out 3-4 times of rough rolling in an austenite recrystallization zone, wherein the initial rolling temperature is 1070-1130 ℃, the single-pass reduction rate is 19.2-25.3%, and the total cumulative reduction rate is 53.8-63.8%, so as to obtain an intermediate blank with the thickness of 47-60 mm;
(4) Carrying out 4-5-pass finish rolling in an austenite non-recrystallization region, wherein the initial rolling temperature is 820-870 ℃, the single-pass reduction rate is 20.0-27.7%, the total cumulative reduction rate is 66.7-74.5%, and the final rolling temperature is 780-820 ℃ to obtain a hot rolled plate with the thickness of 12-20 mm;
(5) after rolling, the hot rolled plate is cooled to below 200 ℃ in air;
(6) quenching (Q) treatment: heating the hot rolled plate to 760-820 ℃, preserving heat for 40-70 min, and then quenching to below 200 ℃ to obtain a quenched steel plate;
(7) tempering (T): and heating the quenched steel plate to 610-640 ℃, tempering for 40-100 min, and cooling with water or air to room temperature after discharging to obtain the low-nickel type steel plate for the LNG storage tank with the thickness of 12-20 mm.
3. the method for manufacturing a steel sheet for a low-nickel type LNG storage tank based on the QT process as claimed in claim 2, wherein the thickness of the ingot in the steps (1), (2) is 130 mm.
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| CN100462466C (en) * | 2007-05-26 | 2009-02-18 | 山西太钢不锈钢股份有限公司 | Method of producing low-temperature high-toughness steel and steel plate |
| CN103374681B (en) * | 2012-04-13 | 2015-07-29 | 株式会社神户制钢所 | The Plate Steel of pole excellent in low temperature toughness |
| CN104278210A (en) * | 2013-07-08 | 2015-01-14 | 鞍钢股份有限公司 | High nickel steel for ultralow-temperature pressure vessel and manufacturing method thereof |
| CN104988404A (en) * | 2015-07-13 | 2015-10-21 | 武汉钢铁(集团)公司 | Low-nickel steel plate for pressure vessel at low temperature of -196 DEG C and production method thereof |
| CN105543694B (en) * | 2015-12-29 | 2017-12-29 | 东北大学 | A kind of preparation method of LNG tank 7Ni steel plates |
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Application publication date: 20190104 Assignee: Xiangtan Iron & Steel Co.,Ltd. Of Hunan Hualing Valin Assignor: Northeastern University Contract record no.: X2022210000001 Denomination of invention: Steel plate for low nickel LNG storage tank based on QT process and its preparation method Granted publication date: 20191210 License type: Common License Record date: 20220106 |