Method of surface-treating reactor member and method of...

Details Method of surface-treating reactor member and method of... Method of surface-treating reactor member and method of...

2005-03-22

2005-03-22

Wilson, Lee D (Department: 3723)

Abrading

Abrading process

With critical nonabrading work treating

C451S028000

Reexamination Certificate

active

06869338

ABSTRACT:
A method of surface-treating a reactor member for effectively removing a Cr-deficient layer and a work-hardened layer considered to be a cause of stress-corrosion cracking (SCC) under low-stress conditions. The method of surface-treating a reactor member which is worked by bending (step1) and then processed by a heat treatment (step2), in which a work-hardened layer is formed by the bending, and in which a Cr-deficient layer is formed due to an oxide film attached by the heat treatment, uses at least one of: acid wash; grinding; electrolytic polishing; electro-discharge machining; surface cutting; surface deoxidation and softening; wet blasting; laser machining; or surface plating (step3) to remove the work-hardened layer and the Cr-deficient layer from the reactor member or to prevent contact of the work-hardened layer and the Cr-deficient layer of the reactor member with a primary coolant.

REFERENCES:
patent: 5577949 (1996-11-01), Matsumoto
patent: 6110823 (2000-08-01), Eldridge et al.
patent: 20030129929 (2003-07-01), Monaka et al.

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