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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, achieve the effect of reducing alloy costs and facilitating stable control

Active Publication Date: 2016-05-04
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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  • Preparation method of 7Ni steel plate for liquefied natural gas storage tank
  • Preparation method of 7Ni steel plate for liquefied natural gas storage tank
  • 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. The composition mass percentage of 7Ni steel plate for liquefied natural gas storage tank is C0.043%, Si0.07%, Mn0.87 %, S0.004%, P0.006%, Ni7.26%, Cr0.53%, Al0.023%, 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 ≥...

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. The composition mass percentage of 7Ni steel plate for liquefied natural gas storage tank is C0.052%, Si0.05%, Mn0.65 %, S0.003%, P0.006%, Ni7.02%, Cr0.67%, Al0.047%, 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 1...

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Abstract

The invention discloses a preparation method of a 7Ni steel plate for a liquefied natural gas storage tank and belongs to the field of alloy steel manufacturing. The preparation method comprises the following steps: (1), smelting according to components of the 7Ni steel plate; (2), after heat preservation knobbling, carrying out hot rolling: rough rolling and finish rolling; and (3), cooling the hot rolled plate to a temperature of 20 to 300 DEG C at a super fast speed, then rising the temperature and keeping the temperature, and carrying out water cooling or air cooling to reach a room temperature so as to obtained a finished product, or carrying out air cooling to the hot rolled plate to reach a temperature of 660 to 700 DEG C, then quenching after heat preservation, rising the temperature and keeping the temperature, and then carrying out water cooling or air cooling to reach a room temperature, so as to obtained the finished product. The preparation method of the 7Ni steel plate for the liquefied natural gas storage tank has the beneficial effects as follows: (1), except for four elements such as C, Si, Mn and Ni in the components, only a small quantity of Cr element is added, stable control to components is facilitated, and the alloy cost is lowered; and (2), the TMCP technology is adopted, the hot rolling process is reasonably designed, the organization is detailed, and the low-temperature toughness and intensity of steel are improved; (3), after finally rolling, carrying out on-line quenching and tempering or air cooling to two-phase region heat preservation quenching and tempering, the heat processing time is short, and the product rhythm is compact.

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 Applications(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
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