Effects of wet H 2 S containing environment on mechanical properties of NACE grade C–Mn steel pipeline girth welds

The nanostructured Fe-V-Nb master alloy was prepared in vacuum rapid quenching furnace and then was added in the steel melts as modificators before casting. Next, the effects of the nanostructured Fe-V-Nb modificators on the microstructure and mechanical properties of the steel were studied. The results show that the grain size of the steel has been effectively refined, which is mainly because the dispersed nanoscale particles can produce more nucleation sites during the solidification of the liquid steel. Tensile properties and fracture morphology reveal that the yield strength and toughness of the steel modified by nanostructured Fe-V-Nb modificators are better than that of the microalloyed steel. TEM analysis shows that vanadium and niobium in the modificators exist in the form of (V, Nb) C which effectively increases the nucleation rate and leads to better mechanical properties of the steel.

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Mechanism of Microstructural Control and Mechanical Properties in Hot Rolled Plain C–Mn Steel during Controlled Cooling

ISIJ International ◽

10.2355/isijinternational.isijint-2015-040 ◽

2015 ◽

Vol 55 (8) ◽

pp. 1721-1729 ◽

Cited By ~ 7

Author(s):

Chengning Li ◽

Guo Yuan ◽

Fengqin Ji ◽

Jian Kang ◽

Devesh Misra ◽

...

Keyword(s):

Mechanical Properties ◽

Controlled Cooling ◽

Hot Rolled ◽

Mn Steel ◽

Microstructural Control

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Microstructure and mechanical properties of a novel medium Mn steel with Cr and Mo microalloying

Materials Science and Engineering A ◽

10.1016/j.msea.2021.141926 ◽

2021 ◽

Vol 825 ◽

pp. 141926

Author(s):

Chao Wang ◽

Liming Yu ◽

Ran Ding ◽

Yongchang Liu ◽

Huijun Li ◽

...

Keyword(s):

Mechanical Properties ◽

Microstructure And Mechanical Properties ◽

Medium Mn Steel ◽

Mn Steel

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A novel test method for mechanical properties of characteristic zones of girth welds

International Journal of Pressure Vessels and Piping ◽

10.1016/j.ijpvp.2021.104533 ◽

2021 ◽

pp. 104533

Author(s):

Hailiang Nie ◽

Weifeng Ma ◽

Kai Xue ◽

Junjie Ren ◽

Wei Dang ◽

...

Keyword(s):

Mechanical Properties ◽

Test Method ◽

Girth Welds

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Mechanical Properties of Main Steel Pipeline P92 Steel in Ultra-Supercritical Unit after 50,000 h Service

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/680/1/012061 ◽

2021 ◽

Vol 680 (1) ◽

pp. 012061

Author(s):

Xinmei Li ◽

Zhongwen Zhang ◽

Baoshuai Du ◽

Yong Zou ◽

Shuai Suo ◽

...

Keyword(s):

Mechanical Properties ◽

P92 Steel ◽

Steel Pipeline

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Reel Installation of 15” Clad Steel Pipeline With Direct Electrical Heating and In-Line T

Volume 4: Terry Jones Pipeline Technology; Ocean Space Utilization; CFD and VIV Symposium ◽

10.1115/omae2006-92525 ◽

2006 ◽

Author(s):

Geir Endal ◽

Oddbjo̸rn Nupen ◽

Masahiro Sakuraba ◽

Katsuji Kondo

Keyword(s):

Steel Production ◽

Electrical Heating ◽

Steel Pipeline ◽

Norwegian Sea ◽

Production Pipeline ◽

Clad Steel ◽

Girth Welds

The Norne Satellite project in the Norwegian Sea involved installation of a 9 km long 15” thermally insulated clad steel production pipeline. The pipeline is equipped with Direct Electrical Heating for hydrate control and an in-line T for connection of a mid-line reservoir. The installation was performed in 2005 with the reel ship “CSO Apache” after completion of comprehensive qualification programs. The Norne Satellite project represents a step forward in sub-sea pipeline technology, with the following main firsts: • Reeling of clad steel pipeline. • Direct Electrical Heating of clad steel pipeline. • Direct Electrical Heating of pipeline with in-line T. • AUT of clad steel girth welds. This paper presents experiences from the qualification and installation works.

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