自主设计Cr-Ni-Cu-Ti-V-Nb合金成分体系，通过用户网带炉淬火+回火热处理工艺，实现强韧性匹配。热处理工艺制度：奥氏体化温度900℃保温1小时，在620-630℃下保温2小时，控制10.9级耐火耐候螺栓钢在25℃下拉伸性能满足，控制10.9级耐火耐候螺母（M20）室温下力学性能满足，施加22500N，保持15s，能自由旋下，性能合格。维氏硬度H30，硬度在267-273HV。

The composition system of Cr-Ni-Cu-Ti-V-Nb alloy was designed independently, and the matching of strength and toughness was realized through the user mesh belt furnace quenching and tempering heat treatment process. Heat treatment process: austenitizing temperature 900℃ for 1 hour, in 620-630℃ for 2 hours, control 10.9 grade refractory weather resistance bolt steel at 25℃ to meet the tensile properties, control 10.9 grade refractory weather resistance nut (M20) at room temperature to meet the mechanical properties, applied 22500N, keep 15s, can free rotation, qualified performance. Vickers hardness H30, hardness in 267-273HV.