Microstructural Control and DWTT Toughness in Thick-Walled Nb-Ti-V Microalloyed Linepipe Steels

K.M. Banks

doi:10.4028/www.scientific.net/MSF.500-501.303

Paper Titles

The Development of Vanadium Containing Steels Suitable for Thin Slab Casting
p.269

Effect of Nb and V in the Development of Texture and Plastic Strain Ratio in Low Carbon Microalloyed Steels Produced by A.S.T. Technology
p.279

Development of CSP^® Processed High Strength Pipe Steels
p.287

Austenite Grain Size of Thin Slab and Its Influence on Direct Hot Strip Rolling of Nb Microalloyed Steel
p.295

Microstructural Control and DWTT Toughness in Thick-Walled Nb-Ti-V Microalloyed Linepipe Steels
p.303

Cr Influence on Steel Microstructure and Kinetics of Austenite Decomposition at Near-Bay Temperatures
p.311

Influence of Boron on Dynamic Recrystallization and Continuous Cooling Transformation of High Strength Interstitial Free Steels
p.321

Kinetics and Microstructural Aspects of the Coupling between Deformation at the Austenitic State and Ferrite Transformation in Carbon Steels
p.329

Contribution to the Understanding of Austenite Stability in a 12Cr-9Ni-4Mo Maraging Steel
p.339

HomeMaterials Science ForumMaterials Science Forum Vols. 500-501Microstructural Control and DWTT Toughness in...

Microstructural Control and DWTT Toughness in Thick-Walled Nb-Ti-V Microalloyed Linepipe Steels

Abstract:

Production of thick-walled low C Nb-Ti-V microalloyed linepipe steel has recently commenced in South Africa. Generally, the DWTT failures occurred when the average ferrite grain size was larger than 5µm and the pearlite colonies were coarse. This work examined the hot strip rolling behaviour of Nb-Ti-V microalloyed steel and quantified the most important parameters influencing final grain size and, hence, toughness. A Gleeble 1500 was used to both simulate hot rolling of relatively thick strip and also determine the no-recrystallisation temperature. For a fixed composition, final grain size was mainly controlled by the amount of strain applied below the norecrystallisation temperature, which was determined by the roughing mill exit temperature.

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Materials Science Forum (Volumes 500-501)

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303-310

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https://doi.org/10.4028/www.scientific.net/MSF.500-501.303

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Online since:

November 2005

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K.M. Banks

Keywords:

Grain Size, Line Pipe Steel, Microstructure, Recrystallization, Toughness

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