The heat treatment process comprises annealing, hardening and tempering.
热处理过程包括：退火、淬火与回火。
In the process known AS annealing, we heat the steel above the critical temperature and permit it to cool very slowly.
在通常所说的退火的热处理过程中，我们把钢加热到临界温度以上，再让它慢慢冷却。
A mathematical model for heat transfer process in HPH furnace was established and verified, then applied to analysis of the relationship between gas flow rate and annealing time.
通过建立全氢罩式退火炉炉内传热过程的数学模型，并经过实测验证后，分析了循环风量与退火时间的关系。
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