ボイラ用 2.25Cr-1Mo 鋼管の外径ひずみによるクリープ余命の推定(高温の組織と強度)(<特集>耐熱鋼・耐熱合金)

概要

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A remaining life estimation method for in-service boiler tubes (2.25Cr-1Mo steel) has been studied in terms of cumulative creep strains. With the life fraction rule presentation, values between 0.98 and 1.90 have been obtained by a number of creep rupture tests under variable temperature conditions. The materials pre-crept to a same strain level at various strain rates between 0.002 and 2%/h showed the remaining life within a range of ±0.2 of the value of the life fraction presentation. For a relatively conservative estimate, correlations between tangential strains on the outside diameter of tube and remaining life have been established for a number of stress levels corresponding to hoop stresses. The present method enables to determine the remaining life nondestructively without operational histories.
1979-06-01