配管固有の材料特性を考慮したクリープ寿命評価手法

抄録

In the analytical life assessment of creep strength enhanced ferritic (CSEF) steels, average creep properties are generally assumed, although there is a large amount of scatter in the creep properties of welded joints of the steels. It is important to estimate the individual creep properties of welded joints of materials used at power stations if analytical life assessment is quantitatively applied to the components of power stations. Thus, author has developed a new method of assessing the individual creep properties of welded portions of actual piping using small samples. This paper describes the concept of the assessment method for modified 9Cr steel, which has been used worldwide as a CSEF steel.