DEVELOPMENT OF GRADE X70 AND X80 FOR SOUR SERVICE LINE PIPE APPLICATIONS

摘要

The paper describes the results of elaborated development work and the application of the very latest technology on steel, plate and pipe making, the recent demand on grade API-5L X70 or even API-5L X80 for specific sour service applications can be met. Furthermore the paper will point out the overall production concept which provides the fundament for the production of such steels with consistent and reliable resistance to hydrogen induced cracking (HIC). The essential parameters will be explained. This includes the utilization of an appropriate quality assurance system. Recent achievements in terms of strength level, thickness and sour service conditions will be explained.