Effects of the Finish Rolling Temperature on Mechanical Properties and Microstructure Evolution of Line Pipe Steel

Kee Hyun Kim; Nong Moon Hwang; Byeong Joo Lee; Jong Kyu Yoon

doi:10.4028/www.scientific.net/MSF.475-479.89

Paper Titles

Characterization of Kinetics of Deformation-Enhanced Transformation in a Low Carbon Steel
p.73

Study on Microstructures and Mechanical Properties of B510L Steel by TMCP
p.77

Microstructural Evolution and Mechanical Properties of Modified 9%Cr-1%Mo Steel upon Isothermal Heat-Treatment
p.81

Formation and Control of the Acicular Ferrite in Low Carbon Microalloying Steel
p.85

Effects of the Finish Rolling Temperature on Mechanical Properties and Microstructure Evolution of Line Pipe Steel
p.89

Microstructures and Properties of a Bainite and Martensite Dual-Phase Cast Steel Fabricated by Combination of Alloying and Controlled Cooling Heat Treatment
p.93

Strengthening and Toughening Mechanisms of the Microalloying Non-Quenching and Tempering Steel
p.97

TEM Observation on Nano-Precipitation of Plain Low Carbon Steel by CSP
p.101

Strain-Induced Precipitation of Nb(CN) during Deformation of Undercooled Austenite in Nb-Microalloyed HSLA Steels
p.105

HomeMaterials Science ForumMaterials Science Forum Vols. 475-479Effects of the Finish Rolling Temperature on...

Effects of the Finish Rolling Temperature on Mechanical Properties and Microstructure Evolution of Line Pipe Steel

Abstract:

Mechanical properties of line pipe steels used in the deep sea or in the severe cold climate depend on alloying elements and manufacturing processes and many efforts have been made to enhance the properties of the line pipe steels. In this study, for systematic approaches to the process design of line pipe steels, its phase diagram was calculated using a Thermo-CalcTM program. The calculations indicated that A3 is around 840oC. Setting the FRT(Finish Rolling Temperature) above A3 appears to be critical to the increase of strength and toughness of line pipe steels by increasing the amounts of acicular ferrite and at the same time by decreasing the precipitation of proeutectoid ferrite. In the case of the FRT below A3, relatively large amounts of proeutectoid ferrite are precipitated from the matrix with the carbon contents of the austenite phase around ferrite being enriched.

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Periodical:

Materials Science Forum (Volumes 475-479)

Pages:

89-92

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.475-479.89

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Online since:

January 2005

Authors:

Kee Hyun Kim, Nong Moon Hwang, Byeong Joo Lee, Jong Kyu Yoon

Keywords:

Finish Rolling Temperature, Line Pipe Steel, Thermo-Calc^TM

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