Effect of residual air pressure on the long-time strength of low-carbon steel at elevated temperatures

The effect of vacuum in the range 10^–3-10^–6 torr on the long-time strength of steel 08kp for a test base of 500 hr was studied. It was shown that increasing the residual air pressure produces a considerable increase in the long-time strength of the steel studied of 400° C, the effect becoming less pronounced when the test temperature is raised to 800°C.