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Steel plate having superior pitting corrosion resistance and manufacturing method thereof

A steel plate, high-quality technology, applied in the field of steel plate with excellent pitting corrosion resistance, can solve the problems of not being able to apply continuous heating furnaces with excellent productivity and economical efficiency, and achieve the effect of excellent pitting corrosion resistance and excellent pitting corrosion resistance

Inactive Publication Date: 2008-11-05
KOBE STEEL LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, in this technology, in order to form the above-mentioned internal oxide layer and enriched layer, it is necessary to make the temperature in the furnace at a high temperature (for example, 1300° C.), and it needs to be kept for a long time (for example, 4 to 5 hours). There is a problem that a batch heating furnace has to be used instead of a continuous heating furnace which is excellent in productivity and economy

Method used

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  • Steel plate having superior pitting corrosion resistance and manufacturing method thereof
  • Steel plate having superior pitting corrosion resistance and manufacturing method thereof
  • Steel plate having superior pitting corrosion resistance and manufacturing method thereof

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Embodiment Construction

[0021] Cu and Ni are known to be effective elements for improving corrosion resistance, but when added in a large amount, not only the weldability is deteriorated, Ni is particularly expensive, but also the production cost is increased as a result. Under such circumstances, the present inventors have conducted studies from various angles with the aim of realizing a steel sheet excellent in corrosion resistance (especially pitting corrosion resistance).

[0022] As a result, they found that it is not necessary to contain a large amount of Cu and Ni in the steel sheet, but only the surface layer of the steel sheet should be enriched. In addition, it was found that as a method of enriching Cu and Ni on the surface of the steel sheet, if the appropriate temperature range and oxygen concentration during heating of the steel sheet are specified, the secondary scale formed during rolling can be formed in a very short time. Therefore, a region enriched in Cu and Ni (hereinafter referr...

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Abstract

A steel plate of the invention contains C: 0.03-0.2%, Si: 0.05-0.5%, Mn: 0.4-1.8%, P: less than 0.04%, S: less than 0.040%, Al: 0.01-0.10%, N: 0.002-0.0080%, Cu: 0.1-0.5% and Ni:0.1-0.50%, at old austenite grain bound with depth 10 mu m away from the surface of the steel plate, an enrichment area having total content of Cu and Ni more than 1.2% is present, and the area rule of the enrichment area in the section of the plate thickness is more than 5%. According to the structure, even if painting dressing and electric protection are not implemented, practical pitting tolerance is excellent, which is exerted when applied in the crude oil storage tank.

Description

technical field [0001] The present invention relates to steel plates used as structural materials for storage tanks and storage containers for transporting crude oil, and in particular to a steel plate capable of effectively preventing the occurrence of localized corrosion (pitting corrosion or pitting) that occurs on bottom plates of storage tanks such as crude oil tankers , A steel plate with excellent pitting resistance that is useful as a raw material for crude oil storage tanks. Background technique [0002] Steel plates used as raw materials for the aforementioned crude oil storage tanks are often damaged by corrosion due to salt content from seawater and exposure to high and high temperatures. Since such corrosion may cause marine accidents such as flooding and sinking, it is necessary to implement some corrosion prevention measures for steel materials. Conventionally, (a) coating, (b) electric corrosion prevention, etc. are known as anticorrosion means performed so ...

Claims

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Application Information

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IPC IPC(8): C22C38/16C22C38/60C21D1/74
CPCC21D1/34C21D2211/001C22C38/002C22C38/008C22C38/02C22C38/04C22C38/06C22C38/08C22C38/16C22C38/60
Inventor 今村弘树
Owner KOBE STEEL LTD
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