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Steel plate for low-nickel type liquefied natural gas storage tank and preparation method thereof

A technology for liquefied natural gas and steel plates, which is applied in the field of alloy steel manufacturing, can solve problems such as high cost, long heat treatment process, and shortage of Ni resources, and achieve the effects of reducing alloy costs, increasing production efficiency, and improving impact toughness

Inactive Publication Date: 2019-01-29
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, the price of Ni has continued to rise, resulting in high construction costs of LNG storage tanks. At the same time, my country’s Ni resource reserves are scarce, which will cause a serious shortage of Ni resources in the long run. Therefore, it is necessary to develop low-nickel LNG storage tanks. Steel plate to replace 9% Ni steel, thus saving the usage of precious alloy Ni
[0003] Patent CN104674110 discloses a low-temperature steel plate for pressure vessels and its production method, which adds 6.8-8.0% Ni and 0.01-0.09% Nb in the composition design, and the cost is still relatively high; patent CN105543694 discloses a liquefied natural gas storage The preparation method of 7Ni steel plate for tanks, the cost is still high by adding 6.8-7.3% Ni in its composition design; the patent CN104278210 discloses a kind of high-nickel steel for ultra-low temperature pressure vessel and its manufacturing method, and its composition design adds 7.00-7.0% Ni 7.50% Ni, the cost is still high, and the preparation method adopts QLT process, the heat treatment process is long, which is not conducive to energy saving and consumption reduction

Method used

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  • Steel plate for low-nickel type liquefied natural gas storage tank and preparation method thereof
  • Steel plate for low-nickel type liquefied natural gas storage tank and preparation method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0030] A low-nickel steel plate for liquefied natural gas storage tanks in this embodiment, its chemical composition is: C: 0.06%, Si: 0.07%, Mn: 0.65%, Ni: 5.78%, P: 0.005%, S : 0.003%, Cr: 0.52%, Mo: 0.08%, and the balance is Fe and unavoidable impurities.

[0031] A method for preparing a low-nickel liquefied natural gas storage tank steel plate, comprising the following process steps:

[0032] (1) Vacuum induction furnace is used to smelt and cast into an ingot with a thickness of 130mm. The composition by mass percentage is: C: 0.06%, Si: 0.07%, Mn: 0.65%, Ni: 5.78%, P: 0.005% , S: 0.003%, Cr: 0.52%, Mo: 0.08%, the balance is Fe and unavoidable impurities;

[0033] (2) Heating the ingot to 1150°C, holding it for 2 hours, and then carrying out two-stage controlled rolling;

[0034] (3) 4 passes of rough rolling are carried out in the austenite recrystallization zone, the rolling start temperature is 1100°C, the reduction passes are distributed as 130mm→105mm→83mm→62mm→47...

Embodiment 2

[0041] A low-nickel steel plate for liquefied natural gas storage tanks in this embodiment, its chemical composition is: C: 0.05%, Si: 0.06%, Mn: 0.76%, Ni: 6.28%, P: 0.005%, S : 0.004%, Cr: 0.40%, Mo: 0.10%, and the balance is Fe and unavoidable impurities.

[0042] A method for preparing a low-nickel liquefied natural gas storage tank steel plate, comprising the following process steps:

[0043] (1) Melted in a vacuum induction furnace, cast into an ingot with a thickness of 130mm, its composition by mass percentage is: C: 0.05%, Si: 0.06%, Mn: 0.76%, Ni: 6.28%, P: 0.005% , S: 0.004%, Cr: 0.40%, Mo: 0.10%, the balance is Fe and unavoidable impurities;

[0044](2) Heating the ingot to 1150°C, holding it for 1.5h, and then carrying out two-stage controlled rolling;

[0045] (3) 4 passes of rough rolling are carried out in the austenite recrystallization zone, the rolling start temperature is 1085°C, the reduction passes are distributed as 130mm→105mm→84mm→64mm→50mm, and the ...

Embodiment 3

[0052] A low-nickel steel plate for liquefied natural gas storage tanks in this embodiment, its chemical composition is: C: 0.03%, Si: 0.02%, Mn: 1.03%, Ni: 5.02%, P: 0.004%, S : 0.003%, Cr: 0.64%, Mo: 0.12%, and the balance is Fe and unavoidable impurities.

[0053] A method for preparing a low-nickel liquefied natural gas storage tank steel plate, comprising the following process steps:

[0054] (1) Vacuum induction furnace is used to smelt and cast into an ingot with a thickness of 130mm, and its composition by mass percentage is: C: 0.03%, Si: 0.02%, Mn: 1.03%, Ni: 5.02%, P: 0.004% , S: 0.003%, Cr: 0.64%, Mo: 0.12%, the balance is Fe and unavoidable impurities;

[0055] (2) Heating the ingot to 1100°C, holding it for 2 hours, and then carrying out two-stage controlled rolling;

[0056] (3) 4 passes of rough rolling are carried out in the austenite recrystallization zone, the rolling start temperature is 1045°C, the reduction passes are distributed as 130mm→105mm→83mm→62m...

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Abstract

The invention discloses a steel plate for a low-nickel type liquefied natural gas storage tank and preparation method thereof. The steel plate comprises the following chemical components of, by mass,0.03-0.07% of C, 0.02-0.12% of Si, 0.40-1.03% of Mn, 5.02-6.63% of Ni, less than or equal to 0.006% of P, less than or equal to 0.004% of S, 0.25-0.64% of Cr, less than or equal to 0.12% of Mo and thebalance Fe and inevitable impurities. The preparation method comprises the processes (TMCP-UFC-LT) of controlled rolling, ultra-fast cooling, sub-temperature quenching and tempering and comprises thefollowing steps that raw materials are selected and proportioned so as to be smelted and casted into a cast ingot; the cast ingot is heated, and two-stage control rolling is carried out after heat preservation; then ultra-fast cooling (UFC) treatment and sub-temperature quenching (L) treatment are carried out; and finally, tempering (T) treatment is carried out to obtain the steel plate for the low-nickel type liquefied natural gas storage tank.

Description

technical field [0001] The invention belongs to the field of alloy steel manufacturing, and in particular relates to a steel plate for a low-nickel liquefied natural gas storage tank and a preparation method thereof. Background technique [0002] Clean energy is the guarantee for the sustainable development of today's society. By the end of the "13th Five-Year Plan", my country's sea imports of natural gas alone will reach 70 billion m 3 / year, it is planned to build more than 200 super large LNG storage tanks and about 60 transport ships, and the demand for steel for LNG storage tanks is as high as about 600,000 tons. For a long time, 9% Ni steel is the main steel plate for liquefied natural gas storage tanks. Meet the construction requirements of large land-based LNG storage tanks. However, in recent years, the price of Ni has continued to rise, resulting in high construction costs of LNG storage tanks. At the same time, my country’s Ni resource reserves are scarce, wh...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/44C21D8/02C22C33/04
CPCC21D8/0205C21D8/0226C21D8/0263C21D2211/005C21D2211/008C22C33/04C22C38/02C22C38/04C22C38/44
Inventor 刘振宇陈其源陈俊王增辉党玉珍王国栋
Owner NORTHEASTERN UNIV