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Thick steel plate for tank giving weld heat affected zone with excellent toughness

A technology of welding heat-affected and thick steel plates, which is applied in the field of welding heat-affected parts, can solve problems such as non-formation, and achieve the effects of good efficiency, excellent HAZ toughness, and excellent productivity

Inactive Publication Date: 2017-08-18
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the above-mentioned Patent Documents 1 to 4, the steel does not contain Zr or does not contain REM and Zr, so the above-mentioned composite oxides are not formed.

Method used

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  • Thick steel plate for tank giving weld heat affected zone with excellent toughness
  • Thick steel plate for tank giving weld heat affected zone with excellent toughness
  • Thick steel plate for tank giving weld heat affected zone with excellent toughness

Examples

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Embodiment

[0112] The following examples are given to illustrate the present invention more specifically, but the present invention is not limited by the following examples, and can also be modified and implemented within the scope of meeting the aforementioned and hereinafter-described gist, and these are all included in the technical scope of the present invention .

[0113] First, steel having the composition shown in Table 1 was melted in a vacuum melting furnace, and a 240-ton billet was obtained using the obtained molten steel. Specifically, during smelting, after controlling the amount of dissolved oxygen in molten steel to 0.002 to 0.01% by mass % by using deoxidation of Mn, Si, and Al, the order of Ti→(REM, Zr)→Ca Each element was added while controlling the time from Ti addition to Ca addition to 3 to 20 minutes, and the cooling time in the temperature range of 1500 to 1450° C. during casting was made within 300 seconds.

[0114] In this example, REM was added in the form of m...

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Abstract

A thick steel plate for tanks which contains given components and satisfies the relationship (Ti content [Ti])X(N content [N])is equal to or bigger than 0.000085 and in which the nonmetallic particles having a size of 1 [miu] or larger in terms of equivalent circular diameter have a specific average composition and the Ti-containing nitrides satisfy specific average number densities.

Description

technical field [0001] The present invention relates to a thick steel plate for cans having excellent toughness in a welded heat-affected zone (Heat Affected Zone, hereinafter sometimes abbreviated as HAZ). Background technique [0002] From the viewpoint of process saving, component saving, and low component reduction, hot processing of thick steel plates for tanks in the fields of energy storage equipment, chemical mechanical equipment, power generation equipment, nuclear reactor pressure vessels, etc., utilizing rolling and accelerated cooling equipment Control (thermo-mechanical control process, hereinafter sometimes abbreviated as TMCP.) The application is advancing. For example, for the heat treatment type ASTM (The American Society for Testing and Materials) SA-537 steel that undergoes heat treatments such as normalizing, quenching, and annealing, the TMCP type ASTM SA-841 that omits the above heat treatment has been standardized in recent years. [0003] On the othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/14C22C38/58C21C7/04C21D8/02
CPCC22C38/00C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/22C22C38/26C22C38/28C22C38/38C21C7/04C21D8/02C22C38/58
Inventor 伊庭野朗冈崎喜臣名古秀德川野晴弥金子雅人田代喜一郎出浦哲史岛本正树杉谷崇太田裕己佐藤进佑
Owner KOBE STEEL LTD
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