Waermebehandlung von Stahl und Gusseisen in Gasatmosphaere

摘要

1351162 Carbonitriding iron and steel FABRICA DE UTILAJE SI PIESE DE SCHIMB METALOTHEHNICA 9 July 1971 [9 July 1970] 32428/71 Heading C7U Iron or steel is carbonitrided for 1 to 10 hours at 570 Œ 10‹C. in a mixture of methane, ammonia and oxygen in which the ratio CH 4 ; NH 3 is 1, the ratio (CH 4 + NH 3 ): O 2 is 25 to 30, and the ammonia dissociation rate is 35 to 40%.