Prediction of Survivability Time for Express Assessment of Long-Term Performance of Steam Line Metal Parts Made of Steel 10Kh9MFB-Sh
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An assessment of the survivability time was performed for the following two parts made of 10Kh9MFB-Sh steel at 600°C and maximum allowable metal stresses: a pipe measuring 630 mm in diameter and having a wall thickness of 25 mm, and a pipe billet produced by electroslag remelting (ESR) technique. The specific feature of the proposed procedure consists in testing samples containing an extra deep and sharp notch. To determine the time to breaking, the notch opening rate was registered at an increased frequency of 0.003 h. It is shown that metal of the billet produced by the ESR technique has an advantage of longer service life in comparison with the hot-worked pipe. A simplified version of the procedure featuring fixed parameters of the breaking conditions is proposed for the base and weld metal.
Keywordsmetal pipe pipe billet sample notch long-term strength survivability continuity break
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