Methods of heating (C21D1/06 takes precedence)

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General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering > Methods of heating (C21D1/06 takes precedence)

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• C21D 1/38 Heating by cathodic discharges
• C21D 1/40 Direct resistance heating
• C21D 1/42 Induction heating
• C21D 1/44 in heat-treatment baths
• C21D 1/52 with flames
• C21D 1/53 Heating in fluidised beds