Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material

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General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering > Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material

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• C21D 1/76 Adjusting the composition of the atmosphere
• C21D 1/767 with forced gas circulation; Reheating thereof
• C21D 1/773 under reduced pressure or vacuum