Based on two creep constraint parameters (R* and A_c), the constraint-dependent creep crack initiation (CCI) time equations of a Cr–Mo–V steel at 566 °C have been established over a wide range of C* region. The equations are independent on the choice of the reference specimen. Based on the two-parameter (C*-R* and C*-A_c) and the constraint-dependent CCI time equations, the CCI time for the specimens with different geometries and dimensions (with a wide range of constraint levels) has been predicted over a wide range of C* region. The predicted CCI time agrees well with experimental data available and CCI time of finite element simulations based on the creep ductility exhaustion model. The specimen geometry with high constraint strengthens the effect of out-of-plane constraint on the CCI time. The two constraint parameters R* and A_c can give similar CCI time prediction results. The two-parameter approaches with considering constraint effect may be applied in the CCI life assessment of high-temperature components (such as pressure pipes and vessels) under static loads in operating plants.

基于两个蠕变约束参数（R *和A _c），在宽C *区域内建立了Cr-Mo-V钢在566°C时的约束相关的蠕变裂纹萌生（CCI）时间方程。这些方程式与参考样品的选择无关。基于两个参数（C * -R *和C * -A _c）和约束相关的CCI时间方程，具有不同几何形状和尺寸（约束水平范围很广）的标本的CCI时间为在广泛的C范围内预测* 地区。预测的CCI时间与可用的实验数据和基于蠕变延展性耗尽模型的有限元模拟的CCI时间非常吻合。高约束的样品几何形状增强了面外约束对CCI时间的影响。两个约束参数R *和A _c可以给出相似的CCI时间预测结果。考虑约束效应的两参数方法可用于运营工厂中静态载荷下高温组件（例如压力管和容器）的CCI寿命评估。