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A kind of preparation method of 7ni steel plate for liquefied natural gas storage tank

A technology for liquefied natural gas and storage tanks, which is applied in the field of alloy steel manufacturing, can solve problems such as complex production processes, and achieve the effects of short heat treatment time, refinement of structure, and reduction of alloy costs.

Active Publication Date: 2017-12-29
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing patents use the heat treatment process of twice quenching + tempering or normalizing + quenching + tempering, and the production process is complicated

Method used

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  • A kind of preparation method of 7ni steel plate for liquefied natural gas storage tank
  • A kind of preparation method of 7ni steel plate for liquefied natural gas storage tank
  • A kind of preparation method of 7ni steel plate for liquefied natural gas storage tank

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation method of 7Ni steel plate for liquefied natural gas storage tank comprises the steps:

[0042] Step 1, smelting:

[0043] According to the ratio of 7Ni steel plate for liquefied natural gas storage tank, it is smelted in a 50Kg vacuum induction furnace and cast into a billet. %, S: 0.003%, P: 0.006%, Ni: 6.93%, Cr: 0.40%, Al: 0.035%, the balance is Fe and unavoidable impurities

[0044] Step 2, hot rolling:

[0045] (1) Ingot casting of 7Ni steel plate for LNG storage tank, after heat preservation at 1200°C for 1 hour, the billet is opened into a billet with a thickness of 100mm, and the billet is held at 1200°C for 1 hour;

[0046](2) Rough rolling: Rolling is carried out in the austenite recrystallization zone, the total number of passes is 4 times, the reduction rate of each pass is ≥10%, the cumulative reduction rate is ≥50%, the starting rolling temperature is 1160°C, and the final rolling Rolling temperature 1050℃;

[0047] (3) Finish rolling: ...

Embodiment 2

[0055] The preparation method of 7Ni steel plate for liquefied natural gas storage tank comprises the steps:

[0056] Step 1, smelting:

[0057] According to the ratio of 7Ni steel plate for liquefied natural gas storage tank, it is smelted in a 50Kg vacuum induction furnace and cast into a billet. .004%, P 0.006%, Ni 7.26%, Cr 0.53%, Al 0.023%, the balance is Fe and unavoidable impurities

[0058] Step 2, hot rolling:

[0059] (1) Ingot casting of 7Ni steel plate for liquefied natural gas storage tank, after heat preservation at 1170°C for 2 hours, the billet is opened into a billet with a thickness of 100mm, and the billet is held at 1160°C for 2 hours;

[0060] (2) Rough rolling: Rolling is carried out in the austenite recrystallization zone, the total number of passes is 4 times, the reduction rate of each pass is ≥10%, the cumulative reduction rate is ≥50%, the starting rolling temperature is 1140°C, and the final Rolling temperature 1030°C;

[0061] (3) Finish rollin...

Embodiment 3

[0069] The preparation method of 7Ni steel plate for liquefied natural gas storage tank comprises the steps:

[0070] Step 1, smelting:

[0071] According to the ratio of 7Ni steel plate for liquefied natural gas storage tank, it is smelted in a 50Kg vacuum induction furnace and cast into a billet. .003%, P 0.006%, Ni 7.02%, Cr 0.67%, Al 0.047%, the balance is Fe and unavoidable impurities

[0072] Step 2, hot rolling:

[0073] (1) Cast an ingot of 7Ni steel plate for LNG storage tank, heat it at 1150°C for 2 hours, open the billet into a billet with a thickness of 100mm, and keep the billet at 1150°C for 2 hours;

[0074] (2) Rough rolling: Rolling is carried out in the austenite recrystallization zone, the total number of passes is 4 times, the reduction rate of each pass is ≥10%, the cumulative reduction rate is ≥50%, the starting rolling temperature is 1120°C, and the final Rolling temperature 1020°C;

[0075] (3) Finish rolling: Rolling is carried out in the austenite...

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Abstract

A method for preparing 7Ni steel plates for liquefied natural gas storage tanks, belonging to the field of alloy steel manufacturing. The preparation method is: (1) Melting according to the composition of 7Ni steel plate; (2) After heat preservation and blanking, hot rolling: rough rolling and finish rolling; (3) Ultra-quick cooling of the hot-rolled plate to 20-300°C and raising the temperature After being insulated, water-cool or air-cool to room temperature to get the finished product, or the hot-rolled plate is air-cooled to 660-700°C and then insulated and quenched. After being heated and insulated, water-cooled or air-cooled to room temperature to get the finished product. The beneficial effects of the preparation method of 7Ni steel plates for liquefied natural gas storage tanks of the present invention are: (1) In addition to the four added elements of C, Si, Mn, and Ni, only a small amount of Cr element is added to the components, which is beneficial to the stable control of the components; Reduce alloy costs; (2) Use TMCP technology to rationally design the hot rolling process, refine the structure, and improve the low-temperature toughness and strength of steel; (3) After final rolling, online quenching and tempering or air cooling to the two-phase zone, holding quenching and back Fire, short heat treatment time, tight production rhythm.

Description

technical field [0001] The invention belongs to the field of alloy steel manufacture, and in particular relates to a preparation method of 7Ni steel plates for liquefied natural gas storage tanks. Background technique [0002] With the rapid development of economy, my country has become one of the largest energy consumption countries in the world. A large amount of energy consumption has brought great pressure to the environment. Therefore, natural gas, as a clean and efficient energy that can replace coal and oil, has attracted more and more attention. In the past ten years, my country's natural gas consumption has maintained a steady and rapid growth. Due to the long distance between natural gas production areas and major consumption areas, in order to facilitate maritime transportation and storage, natural gas is generally liquefied into liquefied natural gas (LNG) at a low temperature of -162°C by using advanced refrigeration technology. Its size is reduced by about 6...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/08C22C38/04C22C38/02C22C38/18C22C38/06C21D8/02
CPCC21D8/0226C21D8/0247C21D2211/001C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/08C22C38/18
Inventor 刘振宇王猛李成刚王国栋
Owner NORTHEASTERN UNIV LIAONING