Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Assam, India
Online published on 20 July, 2015.
Centrifugally cast high Cr steels are widely used in petroleum and chemical industries as reformer tubes. In this paper, creep behavior of HP40Nb microalloyed tube steel has been examined at temperatures in the range of 1073 K – 1173 K at different stress levels. The creep deformation behavior follows the Dorn law equation. The constitutive creep equation was obtained using the data obtained from the accelerated creep tests. Following the Orr-Sherby-Dorn parametric technique, the creep life of the material at a service temperature of 1273 K was 10.7 years at a stress of 10 MPa.
HP40Nb steel, Creep, Activation energy, Orr-Sherby-Dorn parameter, Creep life
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