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The possible causes are studied which produce the defectology that, incidentally, is usually present at high-performing pipe rolling processes. The steel qualities included in Specification 5CT (1) for grade C75-1 (C-Mn-Mo-alloyed steel) and grade J55 (C-Mn steel) as well as those qualities regarding Specification 5L (2) for grade A of Standard API (American Petroleum Institute) are studied herein. Both chemical and metallurgical characterizations of the pipe are provided. Defects are diagnosed and conclusions are set.

Diagnosis de la defectología que de forma accidental suele presentar la laminación de tubería de altas prestaciones