General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering

Child Classifications

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• C21D 1/02 Hardening articles or materials formed by forging or rolling, with no further heating beyond that required for the formation
• C21D 1/04 with simultaneous application of supersonic waves, magnetic or electric fields
• C21D 1/06 Surface hardening
• C21D 1/18 Hardening (C21D1/02 takes precedence); Quenching with or without subsequent tempering (quenching devices C21D1/62)
• C21D 1/26 Methods of annealing
• C21D 1/34 Methods of heating (C21D1/06 takes precedence)
• C21D 1/54 Determining when the hardening temperature has been reached by measurement of magnetic or electrical properties
• C21D 1/55 Hardenability tests, e.g. end-quench tests
• C21D 1/56 characterised by the quenching agents
• C21D 1/62 Quenching devices
• C21D 1/68 Temporary coatings or embedding materials applied before or during heat treatment
• C21D 1/74 Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
• C21D 1/78 Combined heat-treatments not provided for above
• C21D 1/82 Descaling by thermal stresses (mechanically B21, B23; chemically C23; electrolytically C25F1/00)
• C21D 1/84 Controlled slow cooling (cooling-beds for metal rolling B21B43/00)