tempering temperature

例句：

1. 1. The steel was tempered at a temperature of 750°C for 3 hours to achieve the desired hardness.
   该钢在750°C的温度下退火3小时，以达到所需的硬度。
2. 2. During the manufacturing process, the material is often tempered to improve its strength and durability.
   在制造过程中，材料经常被退火以提高其强度和耐用性。
3. 3. The engineer carefully monitored the temperature during the tempering process to ensure it remained within the optimalrange.
   工程师在退火过程中仔细监控温度，以确保它保持在最佳范围内。