4Cr16MoN钢是一种新型钢种，它的平衡相图和CCT曲线可以为试验钢的大生产和热处理提供依据，为了和4Cr16Mo钢进行对比，通过JMatpro模拟软件计算4Cr16MoN和4Cr16Mo钢的平衡相图，再利用DIL805A热膨胀相变仪测定其CCT曲线，试验条件是1 050 ℃奥氏体化，保温5 min，按照10、3、12、1、05、01、008、005、003 ℃/S等不同冷速冷却。试验结果表明：在两种试验钢计算的平衡相图中，高温区很宽的温度范围内保持单相奥氏体，未出现δ铁素体相；两种试验钢CCT曲线都有独立的珠光体和贝氏体转变区域，4Cr16MoN钢的P临界冷速和B临界冷速分别是01 ℃/s和12 ℃/s，而4Cr16Mo钢的P临界冷速和B临界冷速分别小于003 ℃/s和3 ℃/s。
The largescale production and heat treatment of 4Cr16MoN steel are provided by the equilibrium phase diagram and CCT curve of steel. The equilibrium phase diagram of 4Cr16MoN and 4Cr16Mo steel are calculated By JMatpro simulation software. Then the CCT curves are measured by DIL805A phase change thermal expansion. Here are the test conditions:1 050 ℃/s austenite, holding 5 min,cooling based on 10、3、12、1、05、01、008、005、003 ℃/s. The results showed that: in calculated equilibrium phase diagram of the two test steels, over a wide high temperature range the steel was maintained to be singlephase austenite, not δ ferrite; Two experimental CCT curves of the steels have independent pearlite and bainite regions; The critical cooling rate of P and B of 4Cr16MoN steel is 01 ℃/s and 12 ℃/s respectively, while the critical cooling rate of P and B of 4Cr16Mo steel is less than 003 ℃/s and 3 ℃/s.
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