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High-strength steel sheet excellent in resistance to stress-relief annealing and low-temperature toughness

A high-strength steel plate, high-quality technology, applied in furnace types, furnaces, heat treatment furnaces, etc., can solve problems such as toughness reduction, achieve excellent low-temperature toughness, and inhibit the effect of strength reduction

Inactive Publication Date: 2011-01-26
KOBE STEEL LTD
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Problems solved by technology

Therefore, in the ductile-brittle fracture transition temperature vTrs (hereinafter simply abbreviated as "fracture transition temperature vTrs") after the usual SR treatment, although a relatively good value may be obtained, it is fully conceivable that it is required in recent years. After severe SR treatment at high temperature for a long time, the toughness will decrease

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  • High-strength steel sheet excellent in resistance to stress-relief annealing and low-temperature toughness
  • High-strength steel sheet excellent in resistance to stress-relief annealing and low-temperature toughness
  • High-strength steel sheet excellent in resistance to stress-relief annealing and low-temperature toughness

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Embodiment Construction

[0032] The inventors of the present invention have studied components that can maintain good weldability without causing a decrease in strength even after long-term SR treatment from various angles. As a result, it was found that as long as the chemical composition is properly controlled, and the content of Cr, Mn and V satisfies the relational expression of the above formula (1), it is possible to try to miniaturize the cementite and suppress the decline in strength. It can be seen that the technical significance. It should be noted that the present applicant has previously filed an application for the present invention (Japanese Patent Application No. 2006-338933). First, the reason for deriving the above expression (1) is as follows.

[0033] As precipitation strengthening, there is known a strengthening method in which a large amount of fine precipitates are dispersed in the matrix, and the magnetic flux pinning effect (Japanese: Pinzhime effect) of the dislocations gener...

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Abstract

A high-strength steel sheet is provided which, even when subjected to long-term stress-relief annealing after welding, decreases little in strength (that is, has satisfactory resistance to stress-relief annealing) and which is excellent also in the low-temperature toughness of the base material and HAZ after the SR treatment. The high-strength steel sheet contains 0.05-0.18% carbon (in terms of mass%; the same applies hereinafter), 0.10-0.50% silicon, 1.2-2.0% manganese, 0.01-0.10% aluminum, 0.05-0.30% chromium, 0.008-0.025% titanium, and 0.01-0.05% vanadium, with the remainder being iron and incidental impurities. The content of phosphorus among the incidental impurities has been reduced to 0.008% or lower. The steel sheet satisfies a given relationship.

Description

technical field [0001] The present invention relates to the fact that the base metal or the heat-affected zone (Heat Affected Zone: sometimes referred to as SR treatment) has little decrease in strength even after welding for a long time. A high-strength steel sheet that is also excellent in low-temperature toughness called "HAZ"). Background technique [0002] In recent years, manufacturers of large steel pressure vessels (tanks) have developed on-site assembly (on-site construction) for overseas tanks for the purpose of cost reduction. Conventionally, the entire tank has been transported to the site after shearing or bending of steel members, assembly (assembly by welding), SR treatment (local heat treatment) of some members, and final assembly have been carried out at our factory. . [0003] However, due to on-site construction in consideration of efficiency, steel members are only cut or bent at our factory, and the materials are transported in unit units, and tanks ar...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C38/38C22C38/58C21D8/02
CPCC21D1/30C22C38/06C21D9/50C21D8/0273C22C38/02C21D8/0226C22C38/28C21D2211/005C21D2211/004C22C38/04C22C38/24
Inventor 下山哲史
Owner KOBE STEEL LTD
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