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Thick steel plate with little change in toughness before and after strain aging

A strain aging, thick steel plate technology, applied in the field of thick steel plates, can solve the problems of toughness influence, difficulty in obtaining toughness, and difficulty in reducing toughness changes, and achieve the effect of small toughness changes

Inactive Publication Date: 2015-12-23
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cooling stop temperature after rolling, which is an important requirement for controlling the amount of solid solution C, is as low as 280°C, and it is considered difficult to obtain sufficient toughness or reduce the change in toughness due to strain aging.
In addition, Ca, which is important for ensuring the toughness of the thick steel plate, is not added in most of the examples, and it is considered that the inclusions have a negative influence on the toughness.

Method used

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  • Thick steel plate with little change in toughness before and after strain aging
  • Thick steel plate with little change in toughness before and after strain aging
  • Thick steel plate with little change in toughness before and after strain aging

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Embodiment

[0101] Hereinafter, the present invention will be described in more detail by citing examples, but the present invention is of course not limited to the following examples, and can also be appropriately modified and implemented within the range that can adapt to the gist of the present invention. included in the technical scope of the present invention.

[0102] Steels with the composition shown in Table 1 and Table 2 are refined by the usual refining method, and after being formed into slabs, they are heated, hot rolled (rough rolling, finish rolling), and cooled. process, thus obtaining a thick steel plate with a processed plate thickness of 100mm. Slab heating temperature, reduction rate during rough rolling, total reduction rate from slab to finished product, rolling finish temperature (FRT), time from rolling to cooling start, cooling start temperature, rolling The subsequent cooling rate, the cooling stop temperature, and the cooling rate after the stop were set to the ...

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Abstract

The subject of the invention is to provide a thick steel plate with little change in toughness before and after strain ageing, wherein the thick steel plate meets prescript chemical composition, and meets Delta G / [Si])0.4 and [Ti]*[N]>=4.0*10-5, and has a mixed composition with ferrite section ratio of 40-90 area% and Bainite section ration of 5-60 area%, also, the sum of ferrite section ratio+ Bainite section ration is more than 90 area%; the thick steel plate also has hard phase of more than 1 area%, and the effective grain diameter is 3-25 mu m. Besides, the quantity of solute C included by the total composition is below 0.035 quality%.

Description

technical field [0001] The present invention relates to a thick steel plate suitable for marine structures and the like, and in particular to a thick steel plate with little change in toughness before and after strain aging. Background technique [0002] It is known that the yield strength (YS) of steel materials increases due to strain aging. On the other hand, it is also known that toughness decreases due to increase in yield strength (YS). That is, there is a possibility that toughness may decrease due to strain aging. The phenomenon occurring during this strain aging can be said to be due to dislocations contained in the structure fixed by solid solution C / N in the as-rolled state, and dislocations introduced by strain application. In view of the above, in order to reduce the change in characteristics due to strain aging, it is considered effective to control the state of dislocations or reduce the amount of solid-solution C / N. [0003] Conventionally, attention has b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C22C38/58C22C38/50
CPCC21D2211/002C21D2211/005C22C38/001C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16
Inventor 伊庭野朗田村荣一三大寺悠介
Owner KOBE STEEL LTD