自主设计Cr-Ni-Cu-Ti-V-Nb合金成分体系，C0.23，Si 0.20，Mn0.68，P0.006，S0.003，Cr0.97，Ni0.38，Cu0.35，Mo0.53，V0.093，Ti0.048，Nb0.034，Al0.027.利用Ni-Cr-Cu元素协同匹配解决10.9级耐火耐候螺栓耐海洋大气腐蚀性能，优化Ti-V-Nb元素匹配析出强化，提高材料耐火（600℃高温）性能及解决与板材耐火性能匹配问题，获得较好的强韧性匹配。

Independent design of Cr-Ni-Cu-Ti-V-Nb alloy composition system,C0.23,Si 0.20, Mn0.68 P0.006, S0.003 Cr0.97, Ni0.38, Cu0.35, Mo0.53, V0.093, Ti0.048, Nb0.034, Al0.027. Ni-cr-cu element cooperative matching was used to solve the Marine atmospheric corrosion resistance of 10.9 grade fire resistance bolt, and Ti-V-Nb element matching precipitation strengthening was optimized to improve the fire resistance (600 high temperature) of the material and solve the fire resistance matching problem with the plate, so as to obtain a better match of strength and toughness.