Hardening (C21D1/02 takes precedence); Quenching with or without subsequent tempering (quenching devices C21D1/62)

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General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering > Hardening (C21D1/02 takes precedence); Quenching with or without subsequent tempering (quenching devices C21D1/62)

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• C21D 1/185
• C21D 1/19 by interrupted quenching
• C21D 1/25 Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")