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C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
C21D1/34—Methods of heating
C21D1/40—Direct resistance heating
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FR1054982D1951-03-091952-03-08Procédé et dispositif pour la trempe de durcissement superficiel des métaux
ExpiredFR1054982A
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