PEARLITE STEEL RAIL OF HIGH INTERNAL HARDNESS TYPE EXCELLENT IN WEAR RESISTANCE, FATIGUE FAILURE RESISTANCE AND DELAYED FRACTURE RESISTANCE AND PROCESS FOR PRODUCTION OF THE SAME

Title:

PEARLITE STEEL RAIL OF HIGH INTERNAL HARDNESS TYPE EXCELLENT IN WEAR RESISTANCE, FATIGUE FAILURE RESISTANCE AND DELAYED FRACTURE RESISTANCE AND PROCESS FOR PRODUCTION OF THE SAME

Document Type and Number:

WIPO Patent Application WO/2009/047926

Kind Code:

A1

Abstract:

The invention provides a pearlite steel rail of high internal hardness type which is excellent in wear resistance, fatigue failure resistance, and delayed fracture resistance; and a process suitable for the production of the rail. Specifically, a pearlite steel rail which has a composition containing by mass C: 0.73 to 0.85%, Si: 0.5 to 0.75%, Mn: 0.3 to 1.0%, P: 0.035% or below, S: 0.0005 to 0.012%, Cr: 0.2 to 1.3%, V: 0.005 to 0.12%, and N: 0.0015 to 0.0060% with the balance consisting of Fe and unavoidable impurities and having a [%Mn]/[%Cr] ratio of 0.3 or above and below 1.0 (wherein [%Mn] is Mn content and [%Cr] is Cr content) and a [%V]/[%N] ratio of 8.0 to 30.0 (wherein [%V] is V content and [%N] is N content) and whose railhead exhibits an internal hardness of Hv380 or above and below Hv480 in terms of Vickers hardness (Hv) in a depth range of at least 25mm from the railhead surface.

Inventors:

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

Application Number:

PCT/JP2008/056273

Publication Date:

April 16, 2009

Filing Date:

March 25, 2008

Export Citation:

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Assignee:

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

International Classes:

C22C38/00; B21B1/085; B21B3/00; C21D8/00; C21D9/04; C22C38/24; C22C38/48

Foreign References:

JPH10195601A	1998-07-28
JPH09241747A	1997-09-16
JPS5818966B2	1983-04-15
JPS5047808A	1975-04-28

Other References: