More effective thermomechanical treatment of microalloyed pipe steel

Abstract

Attention focuses on how the basic hot-deformation parameters in thermomechanical treatment affect the structure formation of hot-deformed austenite, the microstructure, and the mechanical properties of low-carbon microalloy steels used for the manufacture of large-diameter gas pipelines. In rough rolling, small uniformly recrystallized austenite structure is formed and largely retained on subsequent cooling, while the cold working of austenite increases in the final rolling and the annihilation of structural defects is prevented after deformation and before accelerated cooling.