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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

AI Technical Summary

Benefits of technology

The present invention allows for the H-shaped steel to have excellent toughness in the fillet portions without needing special heat treatment after rolling. This improves the reliability of the steel structure and ensures economic efficiency.

Problems solved by technology

However, each countermeasure has a problem that the productivity is impaired with respect to the edging method being the conventional technique.

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

Examples

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[0104]First, as Nos. 1 to 13, and 28 of examples, steels having chemical compositions (unit: mass %) shown in Table 1 were smelted, and steel billets each having a thickness of 250 to 300 mm were manufactured through continuous casting. The steels were smelted in a converter, subjected to primary deoxidation, components were adjusted by adding an alloy thereto, and according to need, vacuum degassing treatment was conducted. Further, the obtained steel billets were subjected to hot rolling under manufacturing conditions shown in Table 2. In the hot rolling, rough rolling was performed, and subsequently, by using an intermediate universal rolling mill and water coolers provided in front of and behind the intermediate universal rolling mill, spray cooling of flange lateral surfaces, reverse rolling, and water cooling after the rolling were conducted according to need.

TABLE 1EXAMPLENo.CSiMnPSCuNiCrVMoNbTiAlREMCaN10.010.340.600.0450.0090.010.000.000.000.0000.000.010.020.0000.00000.00432...

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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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