Shaped steel excellent in fire resistance and producing method therefore

A type of steel and cast steel technology, applied in the field of preparation of the type steel, can solve the problems of increasing strength and yield ratio

Active Publication Date: 2007-07-18
NIPPON STEEL CORP
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  • Claims
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Problems solved by technology

[0015] Therefore, if the C content is high and the mole fraction of deposits of alloy carbides and alloy carbonitrides is excessively increased, the strength and yield ratio at room temperature will be excessively increased even under the same thermal conditions such as the same temperature decrease

Method used

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  • Shaped steel excellent in fire resistance and producing method therefore
  • Shaped steel excellent in fire resistance and producing method therefore
  • Shaped steel excellent in fire resistance and producing method therefore

Examples

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Embodiment

[0102] Embodiments of the present invention are described below. However, the conditions described in these examples are merely descriptive, and the present invention is not limited to these conditions. The present invention can be carried out under other various conditions without departing from the gist of the present invention in order to achieve the object of the present invention.

[0103] The steel ingots and billets used in these examples, having the components / compositions shown in Table 1 and having predetermined mole fractions of deposits by "Thermo-Calc" equilibrium calculations at 600°C and 300°C, were used in the smelting process. Melting in a steel furnace and pouring ingots and billets with a thickness of about 240-300mm in a continuous casting process. In Table 1, "tr" means "undetectable" or "inevitable impurity".

[0104] The conditions of Examples "a-g" of the comparative steel are not within the scope of the present invention. The conditions of the composi...

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Abstract

A shaped steel, such as H-shaped steel, excellent in fire resistance, where a flange portion has 50% or more of a ratio of strength, 80 % or less of yield ratio, and 100 J or more of impact strength of Charpy impact test at 0 DEG C, wherein the ratio of strength = (proof stress of 0.2% at 600 DEG C) / (yield strength at room temperature), and a producing method thereof are provided. The shaped steel comprises in mass percent (%): C: 0.03-0.15; Mo: 0.1- 0.6; V <= 0.35; and N: 0.002-0.012, and the balance being iron and residual impurities, wherein (x) a mol fraction of precipitate of alloy carbides and alloy carbonitrides at 600 DEG C is 0.3 % or more, and (y) the ratio of the mol fraction of precipitate of alloy carbides and alloy carbonitrides at 300 DEG C to the mol fraction of precipitate of alloy carbides and alloy carbonitrides at 600 DEG C is 2.0 or less.

Description

[0001] This application claims Japanese Patent Application No.2004-220337 filed in Japan on July 28, 2004, Japanese Patent Application No.2004-220454 filed in Japan on July 28, 2004, and Japanese Patent Application No. 2004-220454 filed in Japan on July 28, 2005 The priority of Japanese Patent Application No. 2005-207185, the entire contents of which are incorporated herein by reference. technical field [0002] The present invention relates to a new type of steel, such as H-shaped steel, I-shaped steel, angle steel, channel steel, etc., which is used as a building material, has a low yield ratio and has excellent toughness and fire resistance, and also relates to the preparation of the shaped steel method. Background technique [0003] In March 1987, Japan enacted legislation on "New Regulations for Designing Fire-Resistant Buildings". Since then, refractory steels have been realized, which guarantee high strength at high temperatures, which have no or only minimal refract...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/12C22C38/26
Inventor 吉田卓江田和彦北裕史
Owner NIPPON STEEL CORP
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