HIGH STRENGTH RAIL EXCELLENT IN ROLLING FATIGUE DAMAGE RESISTANCE AND ITS PRODUCTION

Japanese Patent JP3368556

B2

PURPOSE: To produce components for producing a high strength rail excellent in rolling fatigue damage resistance in which alumina clusters causing fatigue damage are made small and capable of obtaining fine-grained pearlite and to provide the method for producing the same.
CONSTITUTION: A slab produce by subjecting molten metal having a compsn. contg., by weight, 0.55 to 0.90% C, 0.10 to 1.20% Si, 0.50 to l.50% Mn, 0.002 to 0.035% S, 0.0004 to 0.01%. Mg, ≤0.03% Al, 0.001 to 1.00$ V, 0.001 to 0.075% Ti and 0.0005 to 0.030% N or furthermore contg. the or ≥two kinds and 0.01 to 0.05% Nb, and the balance iron with inevitable impurities such as P by 0deoxidizing treatment by the addition of Mg to continuous casting or the like is subjected to hot rolling. After that, as it is, or after heating to a high temp. for the purpose of heat treatment, it is subjected to accelerated cooling. Thus, the high strength rail in which the total length of alumina clusters of >100μm is regulated to <2000μm per 200mm2 unit area can be obtd.

Shuichi Funaki
Hideaki Kageyama
Shinya Kitamura

JP24443894A

January 20, 2003

October 07, 1994

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Nippon Steel Corporation

C21D8/00; C21D9/04; C22C38/00; C22C38/14; C22C38/50; (IPC1-7): C22C38/00; C21D8/00; C21D9/04; C22C38/14; C22C38/50

JP8104946A
JP7238339A
JP726348A
JP7188875A
JP6279850A
JP6279928A
JP6279925A
JP6279918A
JP247240A

Hiroaki Tamura (1 outside)

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