ESTIMATION OF IMPROVED PRODUCTIVITY BASED ON MATERIALS SUBSTITUTION IN HIGH TEMPERATURE APPLICATIONS. USE OF ALLOY ASTM A-335 P91

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Abstract

In Ecopetrol-ICP was carried out an evaluation of the mechanical and microstructural properties of modified 9G--1 Mo alloy, ASTM A-335 Gr. P91, finding higher strength mechanical properties, allowable stresses and creep rupture strenght, than the conventional 9Cr-1 Mo alloy, ASTM A-335 Gr. P9, recommending the alloy P91 as substitute tube material in the radiation zone of the Visbreaking heater of Cartagena's Refinery (furnace in revamping process). The results obtained permit a thickness reduction of radiation tubes of material P91 close to 25% and increase the internal volume tube over up 8%, which is a parameter to consider in improving productivity and efficiency process. Also would be obtained a significant savings cost in the material among 5 and 1 0%. Additionally, expectations of both design and remaining useful life would be seen extensively favored with this change of alloy.

Translated abstract

En Ecopetrol-ICP se realizó una evaluación de las propiedades mecánicas y microestructurales de la aleación 9Cr-1 Mo modificada, ASTM A-335 Gr. P91, encontrando propiedades de resistencia mecánica, esfuerzos admisibles y resistencia a la termofluencia, muy superiores a las de una aleación 9Cr-1 Mo convencional, ASTM A-335 Gr. P9, recomendando la aleación P91 como material de reemplazo de la tubería de radiación del Horno de Viscorreducción de la Refinería de Cartagena (horno en proceso de cambio). Los resultados obtenidos permiten una reducción de espesor para los tubos de radiación de material P91 del 25% y un aumento del volumen interno del tubo cercano al 8%, lo cual es un parámetro a considerar en el Incremento de productividad y eficiencia del proceso. También se obtendría una reducción significativa en los costos de material entre un 5 y 10%. Además, las expectativas de vida útil de diseño y vida útil remanente se verían ampliamente favorecidas con el cambio de aleación.

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High-Strength Structural and High-Strength Low-Alloy Steels

(1990)

This article considers four types of high-strength structural steels: heat-treated low-alloy steels, as-rolled carbon-manganese steels, heat-treated (normalized or quenched and tempered) carbon steels, and as-rolled high-strength low-alloy (HSLA) steels (which are also known as microalloyed steels). The article places emphasis on HSLA steels, which are an attractive alternative in structural applications because of their competitive price per-yield strength ratios. HSLA steels are primarily hot-rolled into the usual wrought product forms and are furnished in the as-hot-rolled condition. In addition to hot-rolled products, HSLA steels are also furnished as cold-rolled sheet and forgings. This article describes the different categories of HSLA steels and provides a summary of characteristics and intended uses of HSLA steels described in the American Society for Testing and Materials (ASTM) specifications. The article also presents some applications of HSLA steels.