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随着高M数飞机的发展,在气动力热和发动机散热的作用下,后机身尾部的主承力加强框的工作温度常达300℃以上,有的还超过400℃。显然,象30CrMnSiNi2A这样的钢已不能胜任这里的工作。不久前通过鉴定的38Cr2Mo2VA钢是一种可在500℃以下工作的中温超高强度钢,其主要力学性能指标包括:室温σ_b≥170kgf/mm~2,σ_(0.2)≥150kgf/mm~2,σ_5≥9％,ψ≥40％,a_k≥5kgf·m/cm~2,σ_b~(300℃)≥150kgf/mm~2,σ_b~(500℃)≥125kgf/mm~2等。
With the development of high-M aircraft, under the action of aerodynamic heat and engine cooling, the working temperature of the main strengthening frame at the rear of the rear fuselage often reaches above 300 ° C, and some more than 400 ° C. Obviously, such as 30CrMnSiNi2A steel has not qualified for the work here. Not long ago passed the identification of 38Cr2Mo2VA steel is a work in 500 ℃ below the temperature ultra-high strength steel, the main mechanical properties include: σ_b ≥ 170kgf / mm ~ 2, σ 0.2 (0.2) ≥ 150kgf / mm ~ 2, σ_5 ≥ 9%, ψ ≥ 40%, a_k ≥ 5 kgf · m / cm 2, σ_b ~ (300 ° C) ≥ 150 kgf / mm ~ 2, σ_b ~ (500 ° C) ≥ 125 kgf / mm ~ 2,