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High-strength steel plate for nuclear reactor containment and manufacturing method thereof

A technology of high-strength steel plates and steel plates, applied in the field of high-strength steel plates, can solve problems such as increasing manufacturing costs

Inactive Publication Date: 2011-11-30
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method requires increased manufacturing cost and may cause other additional constraints

Method used

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  • High-strength steel plate for nuclear reactor containment and manufacturing method thereof
  • High-strength steel plate for nuclear reactor containment and manufacturing method thereof
  • High-strength steel plate for nuclear reactor containment and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0078] Hereinafter, the present invention will be described in more detail through examples.

Embodiment

[0080] Steel ingots formed of the inventive material and the comparative material containing the alloying elements shown in Table 1 below were produced.

[0081] Table 1

[0082]

[0083] Each ingot having the composition of the inventive material and the comparative material shown in Table 1 was heated and subjected to controlled rolling for the recrystallized region under the conditions shown in Table 2 below. After performing controlled rolling, heat treatment, etc. under the conditions shown in Table 2, the levels of strength and low-temperature toughness were evaluated. The results are shown in Table 2 below. Here, the low-temperature toughness shown in Table 2 was evaluated based on Charpy impact energy obtained by performing a Charpy impact test on a sample having a V-notch at -50°C.

[0084] Table 2

[0085]

[0086]

[0087] (In Table 2, T: temperature, CRR: cumulative rolling reduction)

[0088] In the above Table 2, the grain aspect ratio refers to the ...

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Abstract

There is provided a high strength steel plate including, by weight: 0.03% to 0.20% C, 0.15% to 0.55% Si, 0.9% to 1.5% Mn, 0.001% to 0.05% Al, 0.030% or less P, 0.030% or less S, 0.30% or less Cr, 0.2% or less Mo, 0.6% or less Ni, 0.07% or less V, 0.04% or less Nb, 5 ppm to 50 ppm Ca, 0.005% to 0.025% Ti, 0.0020% to 0.0060% N, 0.0005% to 0.0020% B, the balance of F and unavoidable impurities. The steel plate may be formed of tempered martensite, and conditions for cooling and recrystallization controlled rolling are optimized so as to control an average grain size of a microstructure and an aspect ratio of structure grains.; Accordingly, a superior high- strength steel plate that can be used for an atomic plant, for example, an atomic plant rated at IOOOMW or more by having a tensile strength of at least 650 MPa and an impact toughness of at least 200 J at -5O DEG C, and a method of manufacturing the same can be provided.

Description

technical field [0001] The present invention relates to a high-strength steel plate having high tensile strength and impact toughness, and more particularly, to a high-strength steel plate ensuring sufficient tensile strength and impact toughness for use in nuclear reactor containment vessels, and its manufacture method. Background technique [0002] Deposits of fossil fuels, such as coal and oil, are being depleted worldwide. Due to this global energy depletion, the importance of nuclear energy is currently gaining attention. In fact, the use of nuclear energy is increasing worldwide. [0003] In order to achieve stable energy production, nuclear power plants must be equipped with equipment and components that ensure the safety of nuclear power plants. If these measures are not done properly, catastrophic events may occur when accidents happen to nuclear power plants due to various reasons such as natural disasters. This could cause serious damage to the environment or ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D8/02
CPCC22C38/04C22C38/06C22C38/14C21D8/0263C22C38/001C21D2211/008C21D8/0226C22C38/02C22C38/002C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
Inventor 洪淳泽张成豪房基铉
Owner POHANG IRON & STEEL CO LTD
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