The evolution of microtexture of pipeline steel from strip to bare pipe to coated pipe

During pipe making, mechanical properties of pipeline steel change from strip to bare pipe to coated pipe. In this paper, microtexture evolution at outer surface, outer quarter, centre, inner quarter and inner surface positions for hot rolled strip, bare pipe and coated pipe of X70 pipeline steel was investigated. The results showed that the textures at the inner quarter, centre and the outer quarter positions remained the same from strip to bare pipe to coated pipe. The surface textures changed from strip to bare pipe but remained the same from bare pipe to coated pipe. It can be concluded that there was texture change during the pipe forming process but not in the coating process.