Iron-chromium base brazing filler metals

Details Iron-chromium base brazing filler metals Iron-chromium base brazing filler metals

2005-04-26

2005-04-26

Edmondson, L. (Department: 1725)

Metal fusion bonding

Process

Plural joints

C029S890030, C029S890054, C148S024000, C420S050000, C428S680000, C428S681000

Reexamination Certificate

active

06883701

ABSTRACT:
A plurality of parts are brazed using an iron/chromium filler metal. The parts are preferably composed of stainless steel. The brazed assembly forms a heat exchanger characterized by good corrosion resistance and low rates of leaching of Ni, which are further improved by a post-brazing conditioning step in an oxygen-containing atmosphere at a temperature of about 150° to 600° C. The preferred brazing filler metal consists essentially of a composition having the formula FeaCrbCocNidMoeWfBgSihwherein the subscripts are in atom percent and total 100%, “b” is about 5 to 20, “c” ranges from 0 to about 30, “d” is 0 to about 20, “e” is 0 to about 5, “f” is 0 to about 5, “g” is about 8 to 15, “h” is about 8 to 15, the balance being incidental impurities of up to about 1 percent by weight of the total composition.

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