Flame Hardening of Nodular Cast Irons

摘要

A flame-hardening procedure consisting of multiple flame passes followed by water quenching is described for surface hardening ferritic nodular irons, MIL-I-17166, to a surface hardness of Rockwell C 50-58, with 0.03 to 0. 07 inch case depths. A preliminary literature survey on flame hardening cast irons and laboratory tests used for establishing the flame-hardening pro¬cedure are reported.