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Toughness excellent steel plate of welding heat influence part in ultra-high heat input welding

A welding heat-affected and ultra-high heat technology, applied in the field of steel plates, can solve the problems of insufficient synergistic effect and insufficient HAZ toughness improvement effect.

Inactive Publication Date: 2009-06-03
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

In addition, in this technology, although TiN is considered to be used in combination, the synergistic effect of TiN and ferrite formation ability cannot be fully utilized, and the HAZ toughness improvement effect in high heat energy welding is still insufficient. The problem

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  • Toughness excellent steel plate of welding heat influence part in ultra-high heat input welding
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  • Toughness excellent steel plate of welding heat influence part in ultra-high heat input welding

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Embodiment Construction

[0033] In order to achieve the above-mentioned problems, the inventors of the present invention have repeatedly studied factors affecting HAZ toughness during ultra-high heat input welding from various angles. As a result, it was concluded that the HAZ toughness of the steel plate is largely affected by the formation of embrittlement structures, and that the formation of embrittlement structures can be achieved by suppressing the coarsening of austenite in the high-temperature heating region and during cooling. It is prevented by finely dispersing the transformation nuclei that promote ferrite transformation. Previously, it was considered that the HAZ toughness could not be stabilized well because these factors were insufficient.

[0034] Therefore, the inventors of the present invention have made further studies on the assumption that CaS and TiN in the solidification stage during casting and MnS produced as nuclei are effectively utilized in order to finely disperse ferrite ...

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Abstract

Provided is a steel plate capable of full playing excellent HAZ toughness when implementing superrelevation hot input soldering with above 60 kJ / mm of welding heat energy, moreover even though implementing soldering with larger heat energy such as above 15kJ / mm of welding heat energy. The steel plate of the present invention controls chemical constituent composition suitably and meets the relations as follows: 1.0 <= [Ti] / [N] <= 2.5......(1) wherein [Ti] and [N] represent content of Ti and N (by weight) separately; 2.0 <= 1000 * ([Ca] + 2 * [S] + 3 * [O]) <= 10.0...... (2) wherein [Ca], [S] and [O] represent the content of Ca, S and O (by weight) separately, 0.1 <= [1000 * ([Ca] + 2 * [S] + 3 * [O]) / (solidification cooling speed) <= 100.0...... (3), wherein the solidification cooling speed represents average cooling speed (DEG C / s) when the steel plate solidifying.

Description

technical field [0001] The present invention relates to a steel plate suitable for welded structures such as ships, buildings, and marine structures, and more particularly to a steel plate excellent in toughness at a portion (hereinafter referred to as "HAZ") affected by heat during ultra-high heat input welding. Background technique [0002] Structures in various fields such as ships, buildings, and marine structures are generally constructed by joining steel materials by welding, but the steel materials used in such structures naturally have lower strength from the viewpoint of ensuring safety. In other words, weldability and toughness are also required to be good. [0003] In recent years, with the increase in size of welded structures, improvement in welding work efficiency has been demanded from the standpoint of improvement in work efficiency of structures and reduction in construction costs, which leads to an increase in welding heat energy. In particular, there is a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14B22D25/06B22D27/04
CPCC22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/18
Inventor 高冈宏行冈崎喜臣武田裕之
Owner KOBE STEEL LTD
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