采用X射线衍射、TEM、SEM等研究了时效温度对Fv520(B)钢组织、力学性能及抗H2S应力腐蚀性能的影响。结果表明：在470～620℃时效温度范围内，随温度升高，该钢的强度下降，残余奥氏体含量增加，抗H2S应力腐蚀能力增强。该钢抗H2S应力腐蚀性能与时效相形态、马氏体基体回火程度及残余数量有关。
The effects of aging temperature on microstructure,mechanical properties and stress corrosion resistance in H2S medium of Fv520(B) steel (0.05C,14.5Cr,5.5Ni,1.8Cu,1.70Mo,0.35Nb)have been studied by X-ray deffraction,TEM and SEM.The results show that the strength decreases with the increasing aging temperature in the rang of 470-620℃.The amount of austenite and the stress corrosion resistance increases with the increasing aging temperature,and reaches the highest level at 620℃.Aging phases begin to precipitate at 470℃,and grow with the increase of the aging temperature.The stress corrosion resistance is related to the shape of aging phases,tempering level of martensite and the amount of remaining austenite.The best mechanical properties and stress corrosion resistance can be obtained by aging at 560℃.
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