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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
C21D1/44—Methods of heating in heat-treatment baths
C21D1/46—Salt baths
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FR487497D1917-06-261917-11-09Four perfectionné pour la trempe de l'acier, etc
ExpiredFR487497A
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