以27CrMo低合金高强度钢为对象,研究了不同加热温度下该钢种平衡组织的成分变化。通过用差热分析方法(DTA)测定了其相变点。分别选择700、730、760、790、820、850、880、910、940℃作为实验的加热对比温度。结果表明:加热到不同温度并冷却后的平衡组织全部为珠光体和铁素体的混合组织。随着加热温度的升高,珠光体含量从700℃时的44.40%逐渐增大到940℃时的68.01%。 With 27CrMo low alloy high strength steel as the object, the composition changes of the equilibrium structure of the steel under different heating temperatures were studied. The phase transition point was measured by differential thermal analysis (DTA). 700, 730, 760, 790, 820, 850, 880, 910, 940 [deg.] C respectively were selected as the experimental heating contrast temperature. The results show that the equilibrium structure after heating to different temperatures and cooling is all the mixed structure of pearlite and ferrite. With the increase of heating temperature, the content of pearlite gradually increased from 44.40% at 700 ℃ to 68.01% at 940 ℃.