HIGH-STRENGTH PEARLITE RAIL WITH EXCELLENT DELAYED-FRACTURE RESISTANCE

Title:

HIGH-STRENGTH PEARLITE RAIL WITH EXCELLENT DELAYED-FRACTURE RESISTANCE

Document Type and Number:

WIPO Patent Application WO/2007/111285

Kind Code:

A1

Abstract:

A high-strength pearlite rail which is inexpensive and, despite this, has a tensile strength of 1,200 MPa or higher and excellent delayed-fracture resisntance. The rail contains, in terms of mass%, 0.6-1.0% C, 0.1-1.5% Si, 0.4-2.0% Mn, up to 0.035% P, and 0.0005-0.010% S, the remainder being iron and unavoidable impurities. It has a tensile strength of 1,200 MPa or higher. In a lengthwise-direction section of at least the head part of the rail, A-type inclusions have a major-axis dimension of 250 µm or smaller and the number of A-type inclusions having a major-axis dimension of 1-250 µm is less than 25 per mm2 of the area examined.

Inventors:

HONJO MINORU (JP)
KIMURA TATSUMI (JP)
SUZUKI SHINICHI (JP)
SHIKANAI NOBUO (JP)

Application Number:

PCT/JP2007/056128

Publication Date:

October 04, 2007

Filing Date:

March 16, 2007

Export Citation:

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Assignee:

JFE STEEL CORP (JP)
HONJO MINORU (JP)
KIMURA TATSUMI (JP)
SUZUKI SHINICHI (JP)
SHIKANAI NOBUO (JP)

International Classes:

C22C38/00; C22C38/04; C22C38/58; C21D8/00

Foreign References:

JP2002069583A	2002-03-08
JP2001181737A	2001-07-03
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JPS61143555A	1986-07-01
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Other References: