Rolled h-shaped steel and manufacturing method thereof

Inactive Publication Date: 2019-06-20
NIPPON STEEL & SUMITOMO METAL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0019]According to the present invention, it becomes possible to obtain H-shaped steel excellent in toughness of fillet portions through simple steps without performing special heat treatment such as preliminary heating, and reheating, temperature retention, or the like afte

Problems solved by technology

However, each countermeasure has a problem that the productivity is impa

Method used

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  • Rolled h-shaped steel and manufacturing method thereof
  • Rolled h-shaped steel and manufacturing method thereof
  • Rolled h-shaped steel and manufacturing method thereof

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Example

[0025]Hereinafter, an embodiment of the present invention will be described while referring to the drawings. Note that in the present specification and the drawings, components having substantially the same functional configurations are denoted by the same reference numerals to omit overlapped explanation.

[0026]The present inventors obtained a finding that, if splits are created when forming flange portions and the flange portions are bent to be manufactured, a segregation is dispersed in the whole of the flanges, resulting in that an aggregation of the segregation at fillet portions is improved. First, this finding will be briefly described.

[0027]Note that a manufacturing method of H-shaped steel according to the present embodiment in which flange portions are bent to perform rolling and shaping, is referred to as a “split method” in the present specification.

[0028]First, an outline of the aforementioned “split method” will be briefly described while referring to FIGS. 1. FIGS. 1 a...

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Abstract

Rolled H-shaped steel is characterized in that a top 5% average value of Mn concentrations in a most embrittled portion in a flange is 1.6 times or less an Mn concentration at a position of 1/6 in a flange width direction from an end face in the flange width direction and 1/4 in a flange thickness direction from a face of a flange positioned on a side opposite to that of a web, and a top 5% average value of Mn concentrations in a central segregation portion dispersed in a region 15 mm or more apart from a center of the flange width toward one end face or both end faces in the flange width direction and within 2 mm from a flange surface layer in the thickness direction is not less than 1.1 times nor more than 1.6 times the Mn concentration at the position of 1/6 in the flange width direction from the end face in the flange width direction and 1/4 in the flange thickness direction from the face of the flange positioned on the side opposite to that of the web.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No. 2016-166535, filed in Japan on Aug. 29, 2016, the entire contents of which are incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to rolled H-shaped steel manufactured by performing hot rolling on a steel billet, and a manufacturing method thereof.BACKGROUND ART[0003]Conventionally, H-shaped steel has been widely used as a material of a construction structure, a civil engineering structure, an offshore structure, and the like, and H-shaped steels having various cross sections have been used. In particular, H-shaped steel using a slab having a rectangular cross section and obtained through continuous casting with high productivity as a steel material and manufactured by hot rolling, requires a low manufacturing cost, and is used in various fields. Conventionally, H-shaped steel manufactured from a ...

Claims

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Application Information

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IPC IPC(8): B21B1/088C22C38/02C22C38/04C22C38/06C22C38/00C22C38/58C22C38/50C22C38/48C22C38/44C22C38/46C22C38/60
CPCB21B1/088C22C38/02C22C38/04C22C38/06C22C38/001C22C38/005C22C38/002C22C38/58C22C38/50C22C38/48C22C38/44C22C38/46C22C38/60C21D6/008C21D6/005C21D6/004C21D7/13C21D8/005B21B27/02C21D8/00C22C38/42C22C38/00B21B1/08
Inventor ITO, HIDETOSHIYAMASHITA, HIROSHI
Owner NIPPON STEEL & SUMITOMO METAL CORP
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