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Linde Air Products Co
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Linde Air Products Co
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Publication of FR789132ApublicationCriticalpatent/FR789132A/en
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
C21D1/06—Surface hardening
C21D1/08—Surface hardening with flames
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FR789132D1933-05-041934-05-04
Method and device for tempering iron objects
ExpiredFR789132A
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