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In this article, the material and physical parameters for the creep constitutive equations of cold-drawn 304L stainless steel have been determined using experimental data. Austenitic stainless steel 304L is used mostly in power generation and petrochemical industries because of its high-temperature creep resistance even at above yield stresses. Test samples have been obtained from cold-drawn bars, and the material conforms to ASTM A276-05a specifications. The creep behaviour and properties have been examined for this material by conducting uni-axial creep tests. Constant temperature and constant load uni-axial creep tests have been carried out at three temperatures of 680,700 and 720°C, subjected to constant loads which produce below and above yield initial stresses of 200, 250, 320, 340 and 360 MPa. The experimental data have been used to obtain the creep constitutive parameters using numerical optimisation techniques. In addition, the temperature and stress dependency of the creep properties for this alloy have been investigated using Larson-Miller and Monkman-Grant parameters.

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