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This work was conducted as a small part of BRITE-EURAM Project BE 7463. In order to relate results from laboratory sized specimens to those on actual tubular components, test pieces from straight and cold bent carbon manganese steel tubing were tested under internal pressurisation at 360°C. Project work had previously indicated significant residual stress relaxation in cold bent material at 360°C, hence this was also investigated, it being anticipated that such stresses would play a role in the crack growth. Increased time at 360°C before pressurisation increased failure times on both bends and straight tubing. The latter was found also to contain high residual stresses. Such effects must be taken into consideration both during testing and when applying results to plant situations. Preliminary data analysis indicates that crack growth in tubular materials is faster than crack growth rates in both compact tension and three point bend specimens for equivalent K or C* values. Therefore both geometry and size effects have a significant influence on creep crack growth behaviour.

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