In may 2023, after optimizing the chemical composition and heat treatment process parameters for many times, the technicians of jinyuan special steel finally completed the heat treatment process of low temperature resistant high-strength steel required by customers, meeting the stringent mechanical property requirements. The yield strength is more than 950mpa, the -20 ℃ v-notch impact energy is more than 42j, and the -45 ℃ v-notch impact energy is more than 27j. This material is mainly used for manufacturing key parts of oil rig lifting equipment in polar cold environment.