Process of heat-treatment of articles of cast-iron containing nickel and chromium

摘要

Articles, particularly wear-proof parts, of cast-iron alloyed with nickel and more than 2% chromium is heat- treated in two phases, in order to improve wear-resistance. In the first place the article is maintained at a temperature of 550 ± 75'C for two to six hours, after reaching that temperature throughout, and in the second place is maintained at a temperature of 775 ± 75°C for two to twelve hours, after reaching that temperature throughout. Thereafter the article is left to cool. As a result of this treatment, the chromium carbides are finely dispersed in the matrix.