Corrosion behavior study on heat treated API X70 pipeline steel exposed in different aggressive environments-Reference-Cited by-同舟云学术

Corrosion behavior study on heat treated API X70 pipeline steel exposed in different aggressive environments

Published:2024-05-25 Issue:6 Volume:61 Page:378-397
ISSN:2195-8599
Container-title:Practical Metallography
language:en
Short-container-title:

Author:

Sharma L.¹,Kumar N.²,Jakhar A.³,Mshra S.⁴,Chhibber R.⁵

Affiliation:

1. Faculty of University Centre of Research & Development, Chandigarh University , Mohali - , Punjab , India

2. Research Scholar Mechanical Engineering Department, Chandigarh University Punjab - , India

3. Faculty of Mechanical Engineering Department, Chandigarh University , Mohali - , Punjab , India

4. Research Scholar Mechanical Engineering Department, IIT Jodhpur , Rajasthan - India

5. Faculty of Mechanical Engineering Department, IIT Jodhpur , Rajasthan - , India

Abstract

Abstract API pipeline steels are designed to withstand elevated temperatures and pressures in a variety of environmental conditions. The microstructure of API X70 pipeline steel is characterised by a very fine grain, which contributes to its exceptional strength and ductility. This paper investigates the corrosion behavior of API X70 steel when subjected to appropriate heat treatment processes. The study involves a comprehensive weight loss analysis over 50 days to evaluate the susceptibility of the material to corrosion in various corrosive environments. The specimens were exposed to three different corrosive environments (fresh water pH 7, seawater pH 8 and sodium thiosulfate solution pH 5) for 50 days. Macroscopic analysis was carried out at 4 day intervals. The microstructure of the heat treated samples shows the existence of different phases formed during the heat treatment process. A corrosion rate of 9.056 mils per year (mpy, 1 mil equals 0.001 inch) in the base metal as against 8.131 mpy in the heat treated specimen was observed for the specimen immersed in fresh water medium. In seawater medium, the corrosion rate of 11.685 mpy was observed for the base metal while 10.580 mpy was observed for the heat treated specimen.

Publisher

Walter de Gruyter GmbH

Link

https://www.degruyter.com/document/doi/10.1515/pm-2023-1069/pdf

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