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Welding joint steel plated with excellent low-temperature flexibility

A steel plate, ferrite technology, applied in the direction of welding medium, welding equipment, welding equipment, etc.

Active Publication Date: 2012-01-18
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The effect of fine precipitates on the prevention of embrittlement of the two-phase domain is also small

Method used

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  • Welding joint steel plated with excellent low-temperature flexibility
  • Welding joint steel plated with excellent low-temperature flexibility
  • Welding joint steel plated with excellent low-temperature flexibility

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] For steel billets containing C: 0.08%, Si: 0.15%, Mn: 1.50%, P: 0.009%, S: 0.002%, Al: 0.038%, Ti: 0.014%, N: 0.0046% (steel symbol: A; The remainder is Fe and unavoidable impurities), and rolled to a predetermined thickness under various conditions shown in Table 1 below.

[0059] The evaluation results of the obtained steel sheets are shown in Table 1 below.

[0060] Table 1

[0061]

[0062] It can be seen from Table 1 that in the case of No.7, because the concentration of C in the second phase is too high, the low-temperature joint toughness near the welding line is poor when welding with high heat input. On the other hand, in the examples of No. 1 to 6, since the C concentration in the second phase is appropriate, the low-temperature joint toughness in the vicinity of the welding line at the time of high heat input welding is excellent.

Embodiment 2

[0064] A steel material (steel type A) having the same composition as in Example 1 and a steel material having a composition shown in Table 2 below was melted, and rolled to a predetermined thickness under various conditions shown in Table 3 below.

[0065] The evaluation results of the obtained steel sheets are shown in Table 3 below.

[0066]

[0067]

[0068] It can be seen from Table 2 and Table 3 that in the examples of No.17-21, because the concentration of C in the second phase is too high, the low-temperature joint toughness near the welding line during high-heat input welding is poor, and the low-heat The low-temperature toughness of the heating part in the two-phase region at the time of input welding is also poor. On the other hand, in the examples of Nos.8 to 16, since the concentration of C in the second phase is appropriate, the low-temperature toughness of the heating portion in the two-phase region during welding with high heat input and the vicinity of t...

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Abstract

The invention discloses a steel board, which comprises the following parts: 0.005-0.10% C, less than 0.7% Si, 0.5-2% Mn, less than 0.1% Al, 0.005-0.03% Ti and 0.001-0.01% N, wherein the microscopic tissue is composed of ferrite and other tissues with even density as 4 times as carbon density in the steel board.

Description

technical field [0001] The present invention relates to a steel plate (especially a thick plate) having excellent low-temperature toughness at welded joints (the vicinity of the welding line during high heat input welding, the two-phase region heating portion during low heat input welding, etc.). Background technique [0002] Nowadays, steel sheets excellent in low-temperature toughness are widely demanded in various fields. For example, low-temperature containers for storing liquefied petroleum gas (LPG) and liquefied ammonium are used at low temperatures of about -60°C for liquefaction of gases, and good toughness is required even at such low temperatures. In particular, since welded joints tend to deteriorate in toughness due to microstructural changes caused by welding heat, steel sheets excellent in low-temperature toughness of welded joints are strongly demanded. [0003] For example, the low-temperature toughness of welded joints is improved by adjusting the chemical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K31/12B23K35/22C22C38/14
Inventor 冈野重雄
Owner KOBE STEEL LTD
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