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Thick high tension steel plate for high heat energy input welding and production method thereof

A steel plate, deep technology, applied in the field of thick high-strength steel plate and its manufacturing, can solve the problems of inability to organize, refine, and stably ensure high toughness, and achieve the effect of excellent uniform low temperature toughness and excellent toughness

Inactive Publication Date: 2009-03-25
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the actual situation in this technology is that thick steel plates with a plate thickness of 60 mm or more are included. For such thick steel plates, although it is most effective to improve the toughness of the base material, the structure cannot be refined by rolling which is difficult to control. Therefore, the desired high toughness cannot be stably ensured, and the toughness level can only compensate for the toughness at -20°C.

Method used

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  • Thick high tension steel plate for high heat energy input welding and production method thereof
  • Thick high tension steel plate for high heat energy input welding and production method thereof
  • Thick high tension steel plate for high heat energy input welding and production method thereof

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Embodiment 1

[0064] Steels (steel grades A to U) having the chemical composition shown in Table 1 below were smelted in a converter, and hot-rolled under the conditions shown in Table 2 below to manufacture various steel sheets. In addition, the temperature of the t / 4 portion of the steel sheet is calculated by a process control computer using a difference method. The specific temperature management sequence is as follows. In addition, the Ar3 transformation point described in the following Table 1 adopts the value obtained by the following formula (2). Ar3 phase transition point (℃)=868—369·[C]+24.6·[Si]—68.1·[Mn]—36.1·[Ni]—20.7·[Cu]—24.8·[Cr]+29.6[Mo] ……(2)

[0065] Among them, [C], [Si], [Mn], [Ni], [Cu], [Cr], and [Mo] represent the content (mass %) of C, Si, Mn, Ni, Cu, Cr, and Mo, respectively. .

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Abstract

The invention relates to a thick steel plate with high strength comprising by mass percentage: 0.03-0.08% of C, less than 0.05% of Si, 1.4-1.7% of Mn, 0.01-0.06% of Al, less than 0.05% of P, less than 0.01% of S, 0.20-0.40% of Cu, 0.20-0.60% of Ni, 0.005-0.015% of Nb, 0.005-0.03% of Ti, 0.0005-0.0030% of B and 0.0030-0.0090% of N. The thick steel plate is composed of bainite phase as main body. The maximum crystalline grain diameter is below 20 mu m metered by equivalent circle diameter at a position t / 4 thick from the surface, when area surrounded by high angle grain boundary with adjacent crystallization azimuth difference of more than 15 degrees is used as crystalline grain.

Description

technical field [0001] The present invention relates to a thick, high-strength steel plate having excellent low-temperature toughness of a base material and excellent toughness of a weld heat-affected zone during high heat energy input welding, and a method for producing the same. Background technique [0002] When welding thick steel plates (thick objects) with a plate thickness in the range of 60 to 80 mm, high heat input welding is generally used from the viewpoint of improving welding work efficiency. However, in such high heat input welding, the welding heat input is 100 to 500KJ / cm, and the toughness of the heat-affected zone (hereinafter, abbreviated as "HAZ") of the base material (steel plate) is also likely to deteriorate. Resilience becomes an important condition. So far, there have been various proposals for techniques for improving such HAZ toughness. [0003] In addition, among the above-mentioned steel sheets, not only the toughness of the HAZ, but also the h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C22C38/18C21D8/02
CPCC21D8/0226C21D2211/002C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16
Inventor 泉学
Owner KOBE STEEL LTD