Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Estimation of Remaining Creep Life by Use of Tangential Strain on Outside Diameter of Boiler Tubes (2.25Cr-1Mo Steel)
Kohichi ASAKAWAAkira OHTOMOYoshinori SAIGA
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1979 Volume 65 Issue 7 Pages 869-875


A remaining life estimation method fbr 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 numben of creep rupture tests under variable temperature conditions.
The materials pre-crept to a same strain level at vanious 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 nelatively conservative estimate, correlations between tangential strains on the outside diameter of tube and remaining life have been established for a number of stress levels orresponding to hoop stresses.
The present method enables to determine the remaining life nondestructively without operational histories.

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© The Iron and Steel Institute of Japan
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