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H-section steel and method of producing the same

a technology of h-section steel and h-section plate, which is applied in the direction of joists, building components, construction, etc., can solve the problems of insufficient rolling reduction ratio (the ratio of product thickness and cast slab thickness) and high cost of introducing a cooling facility after rolling, so as to achieve excellent low temperature toughness and reduce cost. , the effect of high strength

Inactive Publication Date: 2015-12-17
NIPPON STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for producing a high-strength H-section steel with excellent low-temperature toughness through rolling without accelerated cooling. This reduces construction costs and periods, while welding on the H-section steel provides minimal toughness reduction in the heated zones, and ensures excellent low-temperature toughness. This enhances the reliability of buildings used in cold regions without sacrificing economic efficiency. The invention thus makes a significant contribution to the industry.

Problems solved by technology

In a case where H-section steel is produced by performing hot rolling on a cast slab obtained by continuous casting, it is difficult to ensure toughness by refining grains.
This is because there is a limit to the maximum thickness of the cast slab that can be produced by a continuous casting facility and thus a rolling reduction ratio (the ratio of product thickness and cast slab thickness) cannot be sufficiently ensured.
However, high cost is required to introduce a cooling facility after rolling.

Method used

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  • H-section steel and method of producing the same

Examples

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examples

[0067]Hereinafter, the present invention will be described in detail on the basis of Examples.

[0068]Steels having the component compositions shown in Table 1 were melted and were subjected to continuous casting such that steel slabs having thicknesses of 240 mm to 300 mm were produced. The melting of the steel was performed in a converter, primary deoxidation was performed, and alloys were added to adjust the components. As necessary, vacuum degassing was performed. The obtained steel slabs were heated and were subjected to hot rolling, thereby producing H-section steels. The components shown in Table 1 were obtained by chemical analysis of samples collected from the produced H-section steels. In addition, the remainder in Table 1 contains Fe and an impurity.

TABLE 1STEELCOMPOSITION (mass %)No.CSiMnCuNiAlTiNaNOBA0.0140.201.820.010.010.0160.0200.0400.00420.00090.0004B0.0140.201.650.010.010.0070.0200.0400.00350.00240.0004C0.0140.201.650.010.010.0160.0200.0400.00400.00100.0004D0.0140.06...

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Abstract

An H-section steel has a predetermined chemical composition, an Nb content and a B content satisfy Nb+125×B≧0.075%, a thickness of a flange is 12 mm to 40 mm, and in a thickness center portion and ¼ flange width portion of the flange, a metallographic structure of a cross-section perpendicular to a rolling direction contains pearlite having a distribution density of 3.2×10−3 units / μm2 or lower and the remainder is formed of ferrite and bainite.

Description

TECHNICAL FIELD OF THE INVENTION[0001]The present invention relates to an H-section steel which is used in a structural member of a building used in a low temperature environment and a method of producing the same, and more particularly to an H-section steel for low temperature use having high strength and excellent toughness in a heat affected zone and a method of producing the same.[0002]Priority is claimed on Japanese Patent Application No. 2013-094589, filed on Apr. 26, 2013, the content or which is incorporated herein by reference.RELATED ART[0003]Recently, due to increasing worldwide energy demand, the demand for structures for use in energy-related facilities in cold regions has rapidly increased. As such a facility, for example, there is a Floating Production, Storage and Offloading System (FPSO), that is, a facility which produces offshore oil and gas, stores the oil and gas in a tank in the facility, and directly offloads the oil and gas onto a transport tanker. H-section ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E04C3/06C21D9/00C21D6/00C22C38/58C22C38/54C22C38/50C22C38/48C22C38/42C22C38/16C22C38/14C22C38/12C22C38/08C22C38/06C22C38/04C22C38/02C22C38/00B21B1/02C21D8/00
CPCE04C3/06E04C2003/0421C21D9/0068C21D6/001C21D6/004C21D6/005C21D6/008C22C38/58C22C38/54C22C38/50C22C38/48C22C38/42C22C38/16C22C38/14C22C38/12C22C38/08C22C38/06C22C38/04C22C38/02C22C38/005C22C38/002C22C38/001B21B1/026E04C2003/0452C21D8/005C22C38/00C21D8/1222C21D9/46C21D2211/002C21D2211/005C21D2211/009
Inventor ICHIKAWA, KAZUTOSHIITO, HIDETOSHIONODERA, NORIAKIMITSUYASU, KAZUAKIYAMAMOTO, KOHICHI
Owner NIPPON STEEL CORP
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