Burst pressure of super duplex stainless steel pipes subject to combined axial tension, internal pressure and elevated temperature

• The burst pressure of super duplex steel is measured under combined loading.
• Effect of elevated temperature on burst pressure is determined.
• Burst pressure decreases with increasing temperature.
• Existing models are reliable at room temperature.
• Burst strength at elevated temperature is lower than predictions.

The burst pressure of super duplex stainless steel pipe is measured under combined internal pressure, external axial tension and elevated temperature up to 160 °C. The experimental results are compared with existing burst pressure prediction models. Existing models are found to provide reasonable estimate of the burst pressure at room temperature but significantly over estimate the burst pressure at elevated temperature. Increasing externally applied axial stress and elevated temperature reduces the pressure capacity.