Steel sheet and production method therefor

A manufacturing method and technology of steel plates, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of uneven structure and material, and achieve the effect of preventing large-scale collapse and excellent brittle crack propagation stop characteristics.

Pending Publication Date: 2021-07-23
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that uneven structure and material are likely to occur due to subtle changes in thermal history

Method used

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  • Steel sheet and production method therefor
  • Steel sheet and production method therefor
  • Steel sheet and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0134] Examples (including comparative examples departing from the scope of the invention) of steel sheets produced according to the present invention and having good brittle crack propagation stopping properties even after being subjected to plastic deformation are shown below.

[0135] Table 1 shows the chemical composition of the test steels. Hot rolling was performed to produce steel sheets with a thickness of 10 to 45 mm from steel slabs having these chemical components, and properties of the obtained steel sheets were evaluated. Table 2 shows the manufacturing conditions of the test steel sheets. Ac obtained by calculation is also shown in this table 3 point and Ar 3 point temperature.

[0136]

[0137]

[0138] The toughness, tensile strength, texture, ratio (area ratio) of ferrite grains with an aspect ratio of 2 or more and a minor axis diameter of 5 μm or less, and brittle crack propagation stop characteristics of the obtained steel sheets were evaluated by ...

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Abstract

Provided is a steel sheet that has excellent brittle crack propagation prevention properties even after having been subjected to plastic deformation. This steel sheet has a predetermined component composition and a structure formed mainly of ferrite, wherein at least 10% of crystal grains of a ferrite phase at the halfway point in the thickness direction of the steel sheet have an aspect ratio of at least 2 and have a minor axis length of at most 5 [mu]m, the halfway point in the sheet thickness direction has a {100}<011> orientation strength of at least 5.5, and, furthermore, the steel sheet having been subjected to a strain of 10% has a Kca (-10 DEG C) of at least 6000 N / mm1.5.

Description

technical field [0001] The present invention relates to a steel plate excellent in brittle crack propagation stopping properties used in large structures such as ships, marine structures, cryogenic storage tanks, pipelines, and building / civil structures, and a method of manufacturing the same. In particular, a steel plate capable of exhibiting excellent brittle crack propagation stopping properties even when the above-mentioned structure is subjected to unexpected large deformation due to collisions, large earthquakes, and the like, and a method for manufacturing the same. Here, the property of stopping the propagation of brittle cracks refers to the performance of stopping the propagation of brittle cracks. Background technique [0002] Accidents associated with brittle fractures of large structures such as ships, marine structures, cryogenic storage tanks, pipelines, and building / civil structures have a great impact on the economy and the environment. A high degree of saf...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/00C22C38/06C22C38/58
CPCC22C38/00C22C38/58C22C38/06C21D8/02C22C38/04C22C38/02C22C38/44C22C38/46C22C38/54C21D9/46C21D8/0205C21D1/18C21D2211/005
Inventor 竹内佳子须贺秀和诹访稔
Owner JFE STEEL CORP
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