Investigation of cooling rate on continuous cooling transformation behavior of API X65 pipeline steel

,; Hashemi, Sayyed

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Tarbiat Modares University Press

Modares Mechanical Engineering

Volume 13, Issue 8 (11-2013) Modares Mechanical Engineering 2013, 13(8): 57-67 | Back to browse issues page

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Hashemi S. Investigation of cooling rate on continuous cooling transformation behavior of API X65 pipeline steel. Modares Mechanical Engineering 2013; 13 (8) :57-67
URL: http://mme.modares.ac.ir/article-15-5636-en.html

Investigation of cooling rate on continuous cooling transformation behavior of API X65 pipeline steel

Sayyed Hashemi ^*

1- The University of Birjand

Abstract: (5585 Views)

The transformation behavior and microstructural characteristics of API X65 pipeline steel were investigated by dilatometry and microstructural observation. Microhardness measurements were used to verify the observed microstructures. The test steel is imported from abroad and is used extensively in Iran natural gas transmission projects. The continuous cooling transformation curves of the test steel were constructed. The results showed that with increasing the cooling rate from 0.5 to 40°C/s, the microstructure changes from polygonal ferrite, quasi-polygonal ferrite-pearlite to acicular ferrite. The microstructure was dominated by acicular ferrite in cooling rates higher than 5°C/s. The results can be used to design the optimum thermo-mechanical control process (through the selection of proper cooling rate) in domestic manufacturing process of the test steel.

Keywords: API X65, Continuous Cooling Transformation, Microalloyed Steel, Acicular Ferrite, Gas Transportation Pipeline, API X65

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