Effect of Ultra Fast Cooling on the Alloy Cost Reduction of the X80 Pipeline Steel |
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| Authors: | Feng Zhou Kaiming M Wu Cong Zhang Oleg Isayev Peter D Hodgson |
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| Affiliation: | 1. The State Key Laboratory of Refractories and Metallurgy, Hubei Collaborative Innovation Center for Advanced Steels, International Research Institute for Steel Technology, Wuhan University of Science and Technology, Wuhan, 430081, China;2. Institute for Frontier Materials, Deakin University, Geelong, Victoria, Australia |
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| Abstract: | The microstructures and mechanical properties of X80 pipeline steels produced by both novel ultra fast cooling and conventional‐accelerated continuous cooling modes are investigated. Results showed that different levels of Mo addition had a remarkable effect on the microstructures and mechanical properties of the investigated pipeline steels. The proeutectoid ferrite and pearlite formation is inhibited in the high‐Mo steel and acicular ferrite is obtained over a wide range of cooling rates, whereas the dominant acicular ferrite microstructure can only be obtained when the cooling rates reach up to 5 C s?1. Very similar microstructures and mechanical properties are obtained in the low‐Mo steel produced with ultra fast cooling and in the high‐Mo steel produced by the conventional‐accelerated continuous cooling. It was proved by simulation and industrial trials that high‐strength low‐alloy steels such as pipeline steels, can be produced using the novel ultra fast cooling which also reduce alloy cost. |
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| Keywords: | mechanical properties microstructures Mo pipeline steels ultra fast cooling |
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