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High-tension steel plate with excellent toughness for high heat energy welding heat influence part

A technology of steel plate and heat input, applied in welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problem of difficulty in miniaturization, and achieve the effect of high safety

Active Publication Date: 2009-08-05
KOBE STEEL LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this technology, it is difficult to say that the miniaturization of the block size is sufficient under high heat energy welding conditions.

Method used

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  • High-tension steel plate with excellent toughness for high heat energy welding heat influence part
  • High-tension steel plate with excellent toughness for high heat energy welding heat influence part
  • High-tension steel plate with excellent toughness for high heat energy welding heat influence part

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Embodiment Construction

[0025] The inventors of the present invention have intensively studied to obtain a high-tensile steel sheet excellent in HAZ toughness (hereinafter simply referred to as "HAZ" toughness) when welding with high heat energy exceeding 500 kJ / cm. As a result, it was found as follows, thereby conceiving the present invention:

[0026] (i) In order to stabilize and ensure the high toughness of the heat-affected zone, it can be realized according to the following points:

[0027] Not only use extremely low C to inhibit MA, but also control the form of MA (specifically, inhibit the formation of needle-like MA);

[0028] Coarse structure that inhibits growth at γ grain boundaries [grain boundary ferrite (GBF) + side lath ferrite (FSP)];

[0029] · It is necessary to realize the miniaturization of the block size of the transformation structure in the γ grain. In the present invention, Mn, Ni, and Cr, which are hardenability improving elements, are appropriately contained,

[0030] (ii...

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Abstract

PROBLEM TO BE SOLVED: To provide a high tensile strength steel plate in which excellent HAZ toughness can be secured when being subjected to high heat input welding. SOLUTION: The high tensile strength steel plate having excellent toughness in the high heat input weld heat-affected zone has a composition comprising, by mass, 0.02 to 0.05% C, 0.05 to 0.20% Si, 1.0 to 2.5% Mn, ≤0.02% (exclusive of 0%) P, ≤0.005% (exclusive of 0%) S, 0.01 to 0.05% Al, 0.2 to 2.0% Ni, 0.5 to 2.0% Cr, 0.005 to 0.025% Ti and 0.004 to 0.010% N, and further satisfying the inequality of 2.3≤(Mn+0.7×Ni+Cr)≤3.7 and the inequality of [Cr / (Mn+0.7×Ni)]≥0.3, and the balance iron with inevitable impurities; wherein, Mn, Ni and Cr denote the contents (mass%) of the respective elements. COPYRIGHT: (C)2007,JPO&INPIT

Description

technical field [0001] The present invention relates to a high-tensile steel sheet having excellent toughness in the heat-affected zone of high-heat-energy welding, and particularly to a high-tensile steel sheet having a tensile strength of 590 MPa or more having excellent toughness in the welded heat-affected zone even when high-heat-energy welding exceeding 500 kJ / cm is performed . Background technique [0002] For example, in submerged arc welding and electroslag welding, which are applied to the assembly of box columns of building structures, in order to achieve further high efficiency of construction, there is a high The case of thermal welding. However, in general, when the welding heat input is increased, the structure of the welding heat-affected zone (HAZ) is known to be coarsened, and the toughness is likely to decrease. So far, from the viewpoint of further improving the safety of building structures, etc., it has been proposed to Various methods of improving th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/50C22C38/58B23K35/22
CPCC22C38/001C22C38/002C22C38/42C22C38/44C22C38/50C22C38/58
Inventor 太田诚
Owner KOBE STEEL LTD
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