normalized tempering

例句：

1. 1. The steel was subjected to normalized tempering to improve its strength and toughness.
   钢材经过正火处理以提高其强度和韧性。
2. 2. During the normalizing process, the temperature is gradually raised to a specific level.
   在正火过程中，温度逐渐升至特定水平。
3. 3. The engineers were tasked with optimizing the normalized tempering parameters for maximum efficiency.
   工程师们被指派优化正火处理参数以实现最大效率。