MODELS TO PREDICT CREEP BEHAVIOR OF HK-40 STEEL

Abstract

An analysis was conducted on the creep behavior of HK.40 steel. This steel is high heat resistant, aged during service, under the conditions of a petrochemical furnace. The different models that describe its creep behavior are discussed. The tests were carried out under a constant load intending to simulate the operating conditions of a catalytic reforming furnace. Among the models proposed in the literature, the models of Degui, Jaske-Simonen, Larson-Miller, Manson-Haferd and Snedden were applied. Another model is proposed to account for the three stages of creep. The samples of the material have had from 74 to 88 thousand hours of service and are tested at a constant load until rupturing.Se efectuó un análisis del comportamiento en termofluencia del acero HK.40, resistente a altas temperaturas, envejecido en servicio, a las condiciones de un horno de petroquímica. Se discuten los distintos modelos que describen su comportamiento en termofluencia. Las pruebas fueron realizadas a carga constante tratando de simular las condiciones de operación de un horno de reforma catalítica. Entre los modelos propuestos por la literatura, se aplicaron el de Degui, Jaske-Simonen, Larson-Miller, Manson-Haferd y Snedden. Se propone otro modelo para explicar las tres etapas del fenómeno de la termofluencia. Las muestras del material tiene entre 74 y 88 mil horas de servicio y se ensayan a carga constante, hasta rotura.

Keywords

• termofluencia
• resistencia a la tracción
• deformación
• creep
• tensile stress
• deformation