Chromium-base coating for wear-resistant steel and method of pre

Details Chromium-base coating for wear-resistant steel and method of pre Chromium-base coating for wear-resistant steel and method of pre

1982-09-30

1984-09-04

Silverberg, Sam

Metal treatment

Compositions

Heat treating

148134, 148 6, 427253, 4273839, C23F 700

Patent

active

044695322

ABSTRACT:
The invention concerns an abrasion resistent coating for steel and a method which makes it possible to obtain such a coating.
The coating comprises two surface layers. The first surface layer, the outer layer, is formed of the phase (Cr, Fe).sub.2 B and possibly the phase M.sub.23 C.sub.6, while the second surface layer, the inner one, is formed of the phase (Fe, Cr).sub.2 B. In order to obtain this coating, a boriding is effected on steels at a temperature less than or equal to 950.degree. C. for a period of time greater than or equal to four hours, followed by a chromizing at a temperature less than or equal to 950.degree. C. for a period of time greater than or equal to 10 hours.
Application to all steels in order to increase their resistance to wear is possible.

REFERENCES:
patent: 3622402 (1971-11-01), Baranow
patent: 3712798 (1973-01-01), Thyme

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