Chromized heat-resistant alloy members and a process for the pro

Details Chromized heat-resistant alloy members and a process for the pro Chromized heat-resistant alloy members and a process for the pro

1997-05-23

1999-09-28

Simmons, David A.

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148516, 148527, 148537, 148714, 427185, 427253, 427295, 4273837, 428667, 428941, C23C 800

Patent

active

059581522

ABSTRACT:
To provide heat-resistant alloy members that maintain the resistance to corrosion at high temperature of the chromized layer formed on Ni- or Co-base heat-resistant alloys and which yet are improved in various mechanical properties. The improved Ni- or Co-base heat-resistant alloy member having a chromized layer that is characterized by having a chromium concentration of 25-80% and a thickness of 10-100 .mu.m. This member is produced by controlling both the vapor pressure of a chromium halide being used in chromization and the temperature therefor in such a way that the chromized layer being formed is adjusted to have a chromium concentration and a thickness within the ranges specified above.

REFERENCES:
patent: 2816048 (1957-12-01), Galmiche
patent: 3664765 (1972-05-01), Ishimatsu
patent: 4485148 (1984-11-01), Rashid

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