Estudo da resistência à trinca induzida por hidrogênio em aço utilizado para fabricação de tubos pelo processo de soldagem SAW

• Autor(a) principal: Silva, Guilherme Souza [UNESP]
• Data de Publicação: 2016
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/155400; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-05-02/000882706.pdf
• topic: Aço - Fragilidade; Tubos; Aço - Fratura; Steel Brittleness

This work aims to show the HIC (Hydrogen Induced Cracking) phenomena on steels used for sour applications, which normally occurs due to the action of Hydrogen Sulfide (H2S) in the presence of water. Several steel projects were tested, applying the methods specified on NACE TM0284-2003. Additionally to NACE specification, one ultrasonic technique, for sample analysis, was also developed in this paper. According to the results, it was concluded that to get HIC resistant steels, for pipe manufacturing, it is necessary to reduce and to control the shape of non-metallic inclusions, as far as to eliminate the banded microstructures transformed at low temperatures, and combined with a suitable chemical composition and controlled rolling followed by accelerated cooling is one of the most appropriated method to obtain a high performance steel for sour applications