Abstract
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.
Highlights
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
M. Failure Analysis: The British Engine Technical Reports
Summary
En la fabricación de tubería para altas prestaciones (3) se suelen producir de forma accidental unos tipos de defectos que, en todos los casos, deben ser estudiados, diagnosticados y evaluados. Estos defectos tienen su origen, unas veces, en el lingote. (c) Consejo Superior de Investigaciones Científicas Licencia Creative Commons 3.0 España (by-nc) de partida, otras, se producen en los trenes de laminación y, las menos, en el tratamiento térmico final (4). Bien es cierto que a veces no es un único proceso el causante del defecto sino que es la actuación sinérgica de los tres procesos comentados. Normalmente los defectos, una vez diagnosticados, se evalúan con respecto a las normas, códigos y especificaciones técnicas al efecto. Los menos, la singularidad del defecto implica reconsideración en el cálculo y, en otros, se considera fundamental y determinante el criterio del metalurgista (5). Gutiérrez de Sáiz-Solabarría I Diagnosis de la defectología que deforma
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