Steel plate for cryogenic container and production method thereof

A production method and low-temperature container technology, applied in the field of steel plates for low-temperature containers, can solve problems such as high cost and poor Z-direction performance, and achieve the effects of high low-temperature impact energy, excellent comprehensive performance, and high tensile area reduction rate

Inactive Publication Date: 2016-01-20
WUYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The mechanical properties of domestic large-thickness, large-weight steel, such as negative temperature impact energy at 1 / 2 of the plate thickness, especially the Z-direction performance is not good, and the production cost is high, resulting in domestic large-thickness, large single-weight steel plates for low-temperature pressure vessels Can not meet market demand

Method used

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  • Steel plate for cryogenic container and production method thereof
  • Steel plate for cryogenic container and production method thereof
  • Steel plate for cryogenic container and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] This example is: 10mm thick steel plate for low-temperature pressure vessel and its production method. The steel plate is smelted from the following components by weight percentage: C: 0.10%, Si: 0.30%, Mn: 1.47%, Ni: 0.38%, P: 0.008%, S: 0.001%, Al: 0.040%, Nb: 0.019%, and the balance is iron and unavoidable impurities.

[0052] The steps of the steel plate production method of the present embodiment are as follows:

[0053] 1) Smelting: The molten steel containing the above weight percentage components is first smelted in an electric furnace, sent to an LF refining furnace for refining, and 17kg / t of lime is added to the steel, fed to an Al line of 700 meters to remove oxygen in the molten steel, and the white slag is kept for 35 minutes. When the temperature of the molten steel reaches 1640°C, it is transferred to the VD furnace for vacuum degassing treatment. The vacuum degree is not greater than 66.6Pa, and the vacuum holding time is 22 minutes. Before vacuuming, 1...

Embodiment 2

[0061] This example is: 32mm thick steel plate for low temperature pressure vessel and its production method. The steel plate is smelted from the following components by weight percentage: C: 0.11%, Si: 0.28%, Mn: 1.43%, Ni: 0.33%, P: 0.003%, S: 0.001%, Al: 0.035%, Nb: 0.017%, and the balance is iron and unavoidable impurities.

[0062] The steps of the steel plate production method of the present embodiment are as follows:

[0063] 1) Smelting: The molten steel containing the above weight percentage components is first smelted in an electric furnace, sent to an LF refining furnace for refining, and 19kg / t of lime is added to the steel, fed to an Al line of 750 meters to remove oxygen in the molten steel, and the white slag is kept for 45 minutes. When the temperature of the molten steel reaches 1635°C, it is transferred to the VD furnace for vacuum degassing treatment. The vacuum degree is not greater than 66.6Pa, and the vacuum holding time is 21 minutes. Before vacuuming, 1...

Embodiment 3

[0071] This example is: 64mm thick steel plate for low-temperature pressure vessel and its production method. The steel plate is smelted from the following components by weight percentage: C: 0.08%, Si: 0.33%, Mn: 1.46%, Ni: 0.67%, P: 0.009%, S: 0.002%, Al: 0.035%, Nb: 0.03%, and the balance is iron and unavoidable impurities.

[0072] The steps of the steel plate production method of the present embodiment are as follows:

[0073] 1) Smelting: The molten steel containing the above weight percentage components is smelted in an electric furnace first, sent to an LF refining furnace for refining, fed with lime 21kg / t steel, and the Al line is 720 meters to remove oxygen in the molten steel, and the white slag is kept for 40 minutes. When the temperature reaches 1645°C, it is transferred to a VD furnace for vacuum degassing treatment. The vacuum degree is not greater than 66.6Pa, and the vacuum holding time is 22 minutes. Before vacuuming, 165kg of CaSi block is added;

[0074] ...

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Abstract

The invention discloses a steel plate for cryogenic containers and a production method, belonging to the technical field of special steel plates and steel plate production methods. This steel plate for cryogenic vessels is smelted from the following components by weight percentage: C≤0.12%, Si0.15-0.50%, Mn1.2-1.6%, Ni0.3-0.8%, P≤0.010%, S≤ 0.005%, Al0.020~0.045%, Nb≤0.040%, the balance is Fe and unavoidable impurities. The invention creates a new steel plate for low-temperature containers and its production method, which can ensure good mechanical properties of the steel plate under the condition of less precious alloy usage, make the steel plate have good structure, comprehensive performance and welding performance, and improve the delivery state of the steel plate The low-temperature impact toughness in the die-welded state meets the market's demand for high-quality low-temperature container steel, and makes a positive contribution to the localization of large-scale engineering low-temperature equipment, with significant economic benefits.

Description

technical field [0001] The invention relates to a steel plate for cryogenic containers and a production method of the steel plate, and belongs to the technical field of special steel plates and steel plate production methods. Background technique [0002] In recent years, with the in-depth development of petrochemical and coal chemical industries, the steel for cryogenic pressure vessels used in the manufacture of various condensation tower equipment in coal chemical, petrochemical and other equipment has developed rapidly. The demand for steel is increasing, and customers have more and more stringent requirements on the impact toughness of the 1 / 2 thickness of the steel plate, and put forward long-term (more than 10 hours) mold welding performance requirements, which have never been done before. The mechanical properties of domestic large-thickness, large-weight steel, such as negative temperature impact energy at 1 / 2 of the plate thickness, especially the Z-direction perfo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/12C22C33/04C21D8/02
Inventor 刘丹刘生张海军高雅张志军王晓书
Owner WUYANG IRON & STEEL
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