Mechanical properties of normal strength mild steel and high strength steel S690 in low temperature relevant to Arctic environment |
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Affiliation: | 1. School of Civil Engineering, Tianjin University, Tianjin 300072, China;2. Key Laboratory of Coastal Civil Engineering Structure and Safety of China Ministry of Education, Tianjin University, Tianjin 300072, China;3. School of Civil Engineering and Built Environment, Queensland University of Technology, Brisbane 4001, Australia;4. Department of Civil and Environmental Engineering, National University of Singapore, E1A-07-03, 1 Engineering Drive 2, Singapore 117576, Singapore;1. School of Civil Engineering, Tianjin University, Tianjin 300350, China;2. Key Laboratory of Coast Civil Structure Safety of Ministry of Education, Tianjin University, Ministry of Education, Tianjin 300350, China |
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Abstract: | The development of Arctic oil and gas fields requires low temperature high strength steel materials that can resist critical loads in extreme environments. This paper investigates the mechanical properties such as stress–strain curves, elastic modulus, yield strength, ultimate tensile strength, and fracture strain of normal mild steel and high strength S690 steel to be used in low temperatures relevant to arctic environment. Tensile tests are carried out on steel coupons at different temperatures ranging from −80 °C to +30 °C in a cooling chamber. The influences of the low temperatures on the mechanical properties of mild steel and high strength steel are compared and their differences are discussed. Regression analyses are also carried out on the test data to develop empirical formulae to predict the elastic modulus, yield strength, and ultimate strength of the steels at ambient low temperatures. Finally, design formulae are recommended and their accuracies are further confirmed by the test data including those from the literature. |
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Keywords: | Arctic environment High strength steel Mild steel Low temperature Mechanical properties |
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