Definition - What does Creep Strength mean?
Creep strength is defined as the maximum stress in a material that will result in a specified amount of creep in a given time at a constant temperature. It is essentially used to measure the material’s ability to withstand sustained loading without significant continuous deformation. In steels, creep strength is only a significant factor at significantly elevated temperatures.
Creep strength is also known as creep limit or creep resistance.
Corrosionpedia explains Creep Strength
Creep strength tells us how resistant a component is to dislocation movement within the material, i.e., how easily the grain boundaries slide relative to each other. The composition of the microstructure is one of the most critical factors in determining the creep strength of a material.
Finer grain sizes are typically associated with stronger material properties. Therefore, the smaller the grain size, the higher the expected creep strength. Conversely, larger grains sizes will produce weaker materials with lower creep resistance.