Processing maps for hot working of HSLA pipeline steel

Abstract

The hot deformation features of HSLA pipeline steel are researched in the temperature from 800 °C-1100 °C and strain rate from 0.001-10 s-1 using isothermal compression tests. According to the variation of power dissipation efficiency with the temperature and strain rate, the hot working process map of HSLA pipeline steel was obtained. The power dissipation map of the HSLA pipeline steel exhibits three domains. The first area exists in the temperature from 885 °C-1100 °C and strain rate from 0.01-1 s-1. The second domain occurs in the temperature from 800 °C-860 °C and strain rate from 0.012-1 s-1. The third area occurs in the temperature from 800 °C-825 °C and strain rate from 0.001-0.008 s-1. When the specimen was deformed at higher temperature and lower strain rate, the efficiency of the power dissipation is more than 0.3, which is considered suitable for DRX to occur and may be considered a feasible condition for hot working.