Method of baking treatment of steel product parts

Details Method of baking treatment of steel product parts Method of baking treatment of steel product parts

2005-02-15

2005-02-15

Yee, Deborah (Department: 1742)

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

C148S566000

Reexamination Certificate

active

06855217

ABSTRACT:
The present invention relates to a method of baking treatment of steel product parts using a high frequency or ultra-high frequency for preventing delayed fracture from occurring due to diffusive hydrogen occluded in steel parts, for example, screws, bolts and the like, or for heating surface layers of the steel parts to generate a difference in temperature between the surface layers and interiors of the steel parts, thereby causing distortion in lattices, wherein the surface layers of the steel parts are rapidly heated to 100 to 300° C. with a high frequency or ultra-high frequency at 10 KHz or higher to remove the diffusive hydrogen which is involved in hydrogen embrittlement, or to transfer an existing state to non-diffusive hydrogen which is not involved in the hydrogen embrittlement.

REFERENCES:
patent: 5906691 (1999-05-01), Burnett et al.
patent: 60-096715 (1985-03-01), None
patent: 05-140642 (1993-06-01), None
patent: 10-204536 (1998-08-01), None
patent: 11-124683 (1999-05-01), None

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