Method for modifying and thereby improving the corrosion resista

Details Method for modifying and thereby improving the corrosion resista Method for modifying and thereby improving the corrosion resista

1992-01-27

1993-03-23

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Producing or treating layered, bonded, welded, or...

148518, 148529, C21D 900

Patent

active

051960753

ABSTRACT:
The invention relates to a method for making workpieces of ferritic steel, such as drilling screws wherein the workpiece is made of a transformable chrome steel having a chrome percentage of at least 13%, whereupon a workpiece receives a coating from nickel or a nickel or cobald alloy having a thickness of at least 5 .mu.m, and subsequently the workpiece is heat treated under oxygen free environment at at least 850.degree. C. so as to obtain a desired hardness and corrosion resistance.

REFERENCES:
patent: 3067072 (1962-12-01), Leffingwell et al.
patent: 4013488 (1977-03-01), Ramqvist et al.
patent: 4411934 (1983-10-01), Steinhagen

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