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Rolled h-beam steel and production method therefor

A manufacturing method, H-shaped steel technology, applied in the direction of manufacturing tools, metal rolling, metal rolling, etc., can solve problems such as bad influence of toughness, and achieve significant contribution

Active Publication Date: 2019-04-16
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When rolled by the edge rolling method, the central segregation part may gather at the part where the web and the flange intersect, that is, the part called the "fillet part", which adversely affects the toughness

Method used

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  • Rolled h-beam steel and production method therefor
  • Rolled h-beam steel and production method therefor
  • Rolled h-beam steel and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0129] As an example of the present invention, a sample was cut out from a rolled H-section steel manufactured to satisfy the composition and manufacturing conditions described in the above embodiments, and the sample was subjected to chemical analysis. On the other hand, as a comparative example, a sample was cut out from a rolled H-section steel that did not satisfy any of the composition and manufacturing conditions described in the above embodiment, and the same chemical analysis was performed. Hereinafter, comparison of detailed examples and comparative examples will be described.

[0130] (Example)

[0131] First, as Examples Nos. 1 to 13 and 28, steels having the composition (unit: mass %) shown in Table 1 were melted, and steel slabs with a thickness of 250 to 300 mm were produced by continuous casting. Steel is smelted in a converter, deoxidized once, alloys are added to adjust the composition, and vacuum degassing is performed as needed. Then, the obtained slabs we...

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Abstract

This rolled H-beam is characterized in that: the average of the top 5% of the Mn concentrations in the most brittle zone of a flange is not more than 1.6 times the Mn concentration at a position thatis located 1 / 6 in the width direction of the flange from a widthwise end face of the flange and 1 / 4 in the thickness direction of the flange from a face of the flange on the reverse side from a web; and the average of the top 5% of the Mn concentration in a center segregation zone that is distributed in a region extending 15 mm or more from the center of the flange width to one or both widthwise end faces of the flange and extending 2 mm or less in a surface layer of the flange in the thickness direction is 1.1 to 1.6 times the Mn concentration at the position that is located 1 / 6 in the widthdirection of the flange from the widthwise end face of the flange and 1 / 4 in the thickness direction of the flange from the face of the flange on the reverse side from the web.

Description

technical field [0001] (Cross-reference of related application) [0002] This application claims priority based on Japanese Patent Application No. 2016-166535 for which it applied to Japan on August 29, 2016, and uses the content here. [0003] The present invention relates to a rolled H-shaped steel produced by hot rolling a billet and a production method thereof. Background technique [0004] H-beams have been widely used as blanks for construction / civil / marine structures, etc., and are used in various cross-sections. In particular, H-shaped steel produced by hot rolling using a slab with a rectangular cross section obtained by continuous casting with high productivity as a steel billet is low in production cost and is used in many fields. In the past, H-beams manufactured from slabs were figure 1 Manufactured by the edge rolling method shown in (a). The edging method is a rolling method in which first, a groove for guiding the steel material to the center of the pass ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B21B1/08B21B1/088C21D8/00C22C38/60
CPCC22C38/60B21B1/088C21D6/004C21D6/005C21D6/008C22C38/001C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58C21D7/13C21D8/005B21B27/02C21D8/00C22C38/42C22C38/00B21B1/08
Inventor 伊藤荣利山下浩
Owner NIPPON STEEL CORP
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