The propensity of two C–Mn steels (BS3602-490Nb and BS3602-HFS35) to creep crack growth has been investigated, mainly in terms of the notch rupture lifetime. The study was carried out at a typical pipe operating temperature of 360°C. Three casts of each steel were compared and a cast to cast variation was revealed which has been attributed to the variations in hardness level and chemical composition. Uniaxial creep rupture characteristics were also determined and it has been shown that an indication of the notch rupture lifetimes of these steels can be obtained from the short-term uniaxial creep rupture characteristics of the material.
MST/534
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