STRESS-RELIEF HEAT TREATMENT APPARATUS

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United States of America Patent

SERIAL NO

14421707

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A stress-relief heat treatment apparatus according to the present invention for stress-relief heat-treating a rail which is welded includes an induction heating coil, and the induction heating coil is arranged at a lateral lace of a web of the rail while being separated from a welding center of the rail by 20 mm to 300 mm in a longitudinal direction of the rail. The stress-relief heat treatment apparatus may include a plurality of the induction heating coils, and the induction heating coils may be arranged at both sides of the welding center. The stress-relief heat treatment apparatus may include a plurality of the induction heating coils, an axial direction of the induction heating coil may be vertical to a lateral surface of the rail and a plurality of the induction heating coils, of which distances from the welding center along the longitudinal direction of the rail are the same, may be arranged to cover a whole circumference of the rail while being separated from each other.

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Patent Owner(s)

Patent OwnerAddress
NIPPON STEEL & SUMITOMO METAL CORPORATIONTOKYO

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Karimine, Kenichi Tokyo, JP 7 48
Ueda, Masaharu Tokyo, JP 38 206

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