4.1 Characteristics of residual creep strength

• goe < gact min, the component can be allowed for further service.

the test component to be operated for such a shorter time tep.

steel after 200,000 h service.

Creep Characteristics of Engineering Materials

Figure 12.

62

material after service under creep conditions.

• goe ≥ gact min, the component cannot be allowed to continue the operation at the required parameters of further service for the adopted time tep.

If goe ≥ gact min and the component cannot be allowed for further service, a shorter time of service should be adopted and the proposed procedure repeated. It may turn out that with a shorter time of further service tep, for the adopted parameters of further service, the condition of goe < gact min will be met. This will allow

The proposed procedure in the form of an algorithm consisting of consecutive steps is shown in Figure 12. Its application is presented on the example of the primary steam pipeline elbow and circumferential welded joint made of 13 HMF

Procedure for determination of the minimum wall thickness of a component after long-term service under creep conditions necessary to transfer the required service loads based on the residual life characteristics of the assessed

The temporary creep strength curve for the material of elbow after 200,000 h service under creep conditions plotted based on results of the tests discussed in Chapter 2 is shown in Figure 13 in the form of lg σ = f(tre) for the temperature of further service Tep = 540°C.
