H section and method for manufacturing same

Inactive Publication Date: 2019-07-04
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0027]According to the aspect of the present invention, it is possible to provide a thick H section,

Problems solved by technology

However, generally, in ferrous materials, as the thickness of a product increases, it becomes difficult to ensure the strength, and it is also difficult to ensure the toughness.
However, when a thick steel plate is manufactured, if accelerated cooling is applied after hot rolling, the cooling rate becomes slow inside the steel plate compared to its surface, so that a significant difference is caused between the surface and the inside in the temperature history during cooling, and a diff

Method used

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  • H section and method for manufacturing same
  • H section and method for manufacturing same

Examples

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Example

EXAMPLE 1

[0129]Next, the effects of the aspect of the present invention will be specifically described in more detail using Examples. However, the conditions in Examples are merely examples of conditions employed to check the feasibility and the effects of the present invention, and the present invention is not limited to these examples of conditions. The present invention can employ various conditions as long as the conditions do not depart from the gist of the present invention and the object of the present invention is achieved.

[0130]Steels respectively having the chemical compositions shown in Table 1 to Table 3 were smelted, and steel pieces having a thickness of 240 mm to 300 mm were manufactured through continuous casting. The steels were smelted by using a converter, and their compositions were adjusted by performing primary deoxidation and adding an alloying element. As necessary, vacuum degassing was performed. H sections were manufactured by heating the obtained steel pie...

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Abstract

This H section includes, as a chemical composition, C, Si, Mn, Nb, V, Ti, and N; in which the H section includes, as a metallographic structure, ferrite of 60 area % to less than 100 area %, an average grain size of this ferrite is 1 μm to 30 μm, a thickness of a flange is 20 mm to 140 mm, tensile yield stress is 385 MPa to 530 MPa, and Charpy absorbed energy at −20° C. is 100 J or more.

Description

TECHNICAL FIELD OF THE INVENTION[0001]The present invention relates to a thick H section, which has excellent strength and low temperature toughness, and a method for manufacturing the same. Priority is claimed on Japanese Patent Application No. 2016-248181, filed on Dec. 21, 2016, the content of which is incorporated herein by reference.RELATED ART[0002]Recently, buildings such as high-rise buildings are becoming large and high, and thick steels have been utilized as strength members required for the structure. However, generally, in ferrous materials, as the thickness of a product increases, it becomes difficult to ensure the strength, and it is also difficult to ensure the toughness.[0003]In regard to such a problem, in Patent Document 1, a technology of ensuring the toughness by utilizing an effect of refining prior austenite grains due to a Ca—Al-based oxide and obtaining a steel, in which high strength is ensured by applying accelerated cooling, is proposed.[0004]In addition, ...

Claims

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Application Information

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IPC IPC(8): C21D8/00C22C38/02C22C38/04C22C38/00C22C38/06C22C38/14C22C38/12C22C38/08C22C38/16C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
CPCC21D8/005C22C38/02C22C38/04C22C38/001C22C38/002C22C38/06C22C38/14C22C38/12C22C38/08C22C38/16C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C21D2211/005C21D8/0226C21D2211/001C21D2211/008C22C38/00C22C38/24C22C38/26C22C38/28C22C38/58B21B1/088
Inventor MIZOGUCHI, MASAKIICHIKAWA, KAZUTOSHISUGIYAMA, HIROKAZUSEIKE, TETSUYA
Owner NIPPON STEEL CORP
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