Microstructure of Nb-Bearing Pipeline Steel with Improved Property Applying Ultrafast Cooling Process
Article first published online: 16 APR 2013
© 2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
steel research international
Volume 85, Issue 1, pages 60–66, January 2014
How to Cite
Yao, S.-J., Du, L.-X. and Wang, G.-D. (2014), Microstructure of Nb-Bearing Pipeline Steel with Improved Property Applying Ultrafast Cooling Process. steel research int., 85: 60–66. doi: 10.1002/srin.201200125
- Issue published online: 9 JAN 2014
- Article first published online: 16 APR 2013
- Manuscript Received: 20 MAY 2012
- Natural Scientific Research Innovation Foundation in Harbin Institute of Technology. Grant Number: 2012DXGJ09
- Development of Science and Technology Plan of Weihai.
- pipeline steel;
- ultrafast cooling;
X70 pipe line steel with high mechanical strength and high ductility can be achieved through hot rolling and ultrafast cooling process at a low cost. A large amount of nano-sized precipitates and dislocations are identified near the surface layer of the steel applying ultrafast cooling, which contribute immeasurably to the improvement of mechanical properties. In addition, high cooling rate decreases the mean distance of pearlite laminae, and massive ferrite grains characterized by curved grain boundaries and high dislocation density are also transformed as one of the typical microstructures in the samples applying ultrafast cooling process.