This article reports the flow stress behaviour of ASTM A335 P92 steel. Uniaxial isothermal compression experiments were conducted to examine hot deformation steel in a Gleeble® 3500 thermal–mechanical simulator. The test conditions 0.01–10 s−1 strain rate and 850–1000 ℃ temperature. Constitutive equations processing maps developed used describe process. results showed that stress–strain curves ...