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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
C21D1/68—Temporary coatings or embedding materials applied before or during heat treatment
C21D1/70—Temporary coatings or embedding materials applied before or during heat treatment while heating or quenching
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FR651807D1927-04-231928-03-27Procédé pour la trempe de l'acier rapide
ExpiredFR651807A
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