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The paper examines the dependence of creep failure modes of butt‐welded pipes upon: temperatures in the range 540–620 °C; the ratio of axial to pressure loadings (loading condition); and, load levels which result in failure times in the region 2000–250 000 h. Continuum damage mechanics (CDM) analyses have been used to analyse two extreme geometries: thin section pipes (4.52 mm) and thick section steam...