PROPERTIES AND MICROSTRUCTURE OF THIRDGENERATION X90 PIPELINE STEEL

XIA Dianxiu; WANG Xuelin; LI Xiucheng; YOU Yang; SHANG Chengjia

doi:10.3724/SP.J.1037.2012.00480

Acta Metall Sin >

2013 , Vol. 49 >Issue 3: 271 - 276

DOI: https://doi.org/10.3724/SP.J.1037.2012.00480

PROPERTIES AND MICROSTRUCTURE OF THIRDGENERATION X90 PIPELINE STEEL

XIA Dianxiu ,
WANG Xuelin ,
LI Xiucheng ,
YOU Yang ,
SHANG Chengjia

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1) School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083
2) Technology Center, Jinan Iron & Steel Group Company, Limited, Jinan 250101

3) Institute of Research of Iron and Steel, Shasteel, Zhangjiagang 215625

Online published: 2013-03-11

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Abstract

The mechanical properties and microstructure of the TG (third generation) X90 pipeline steelswhich have been industrially trial-produced were investigated. The results showed that the microstructure of the18.4 mm thick X90 pipeline steels consist of quasi-polygonal ferrite, lath bainite and M/A (martenite/austenite) island. The yield strength was between 615 and 660 MPa, and the tensile strength was above 720 MPa, and theyield ratio was below 0.9, the impact absorbed energy at --30 ℃ was over 200 J, and the shearing area ofdrop-weight tear test (DWTT) at -15 ℃ was more than 80%. The ratio of the soft phase (quasi-polygonal ferrite)and the hard phase (lath bainite) was about 3∶2, and the dislocation density in the lath bainite was higher, whilethat in the quasi-polygonal ferrite was lower. The EBSD results showed that the lath of the hard phase met theshear transformation characteristics, indicating that the effect of microstructure control on hard and soft phase has been achieved.

Key words： third generation pipeline steel; multi-phases; X90; mechanical property

Cite this article

XIA Dianxiu , WANG Xuelin , LI Xiucheng , YOU Yang , SHANG Chengjia . PROPERTIES AND MICROSTRUCTURE OF THIRDGENERATION X90 PIPELINE STEEL[J]. Acta Metall Sin, 2013 , 49(3) : 271 -276 . DOI: 10.3724/SP.J.1037.2012.00480

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