peak hardness

例句：

1. 1.The material has a peak hardness of 800 HV at room temperature.
   该材料在室温下的硬度峰值为800 HV。
2. 2. The car's engine is designed to reach its peak hardness at high speeds.
   汽车的发动机设计成在高速时达到其硬度峰值。
3. 3.The researcher found that the material had a peak hardness of around 1500 HV.
   研究者发现，该材料的硬度峰值约为1500 HV。