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Title: Development of Electromagnetic Techniques for Hydrogen Content Assessment in Coated Linepipe Steel

Abstract

Through the use of electromagnetic analyses, a new non-contact sensor has been developed for in-situ determination of diffusible hydrogen content in coated linepipe steel. This electromagnetic technique allows for a rapid, non-destructive assessment of hydrogen accumulation in coated steel line pipe and thus an evaluation of the linepipe integrity. The use of induced current resistivity measurements for hydrogen content determination in X80 linepipe steel specimens is demonstrated and discussed.

Authors:
; ; ;  [1]
  1. Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO, 80401 (United States)
Publication Date:
OSTI Identifier:
21054930
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 894; Journal Issue: 1; Conference: Conference on review of progress in quantitative nondestructive evaluation, Portland, OR (United States), 30 Jul - 4 Aug 2006; Other Information: DOI: 10.1063/1.2718097; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BUILDUP; ELECTROMAGNETIC FIELDS; EVALUATION; HYDROGEN; NONDESTRUCTIVE TESTING; QUANTITATIVE CHEMICAL ANALYSIS; SENSORS; STEELS

Citation Formats

Lasseigne-Jackson, A. N., Jackson, J. E., Olson, D. L., and Mishra, B. Development of Electromagnetic Techniques for Hydrogen Content Assessment in Coated Linepipe Steel. United States: N. p., 2007. Web. doi:10.1063/1.2718097.
Lasseigne-Jackson, A. N., Jackson, J. E., Olson, D. L., & Mishra, B. Development of Electromagnetic Techniques for Hydrogen Content Assessment in Coated Linepipe Steel. United States. doi:10.1063/1.2718097.
Lasseigne-Jackson, A. N., Jackson, J. E., Olson, D. L., and Mishra, B. Wed . "Development of Electromagnetic Techniques for Hydrogen Content Assessment in Coated Linepipe Steel". United States. doi:10.1063/1.2718097.
@article{osti_21054930,
title = {Development of Electromagnetic Techniques for Hydrogen Content Assessment in Coated Linepipe Steel},
author = {Lasseigne-Jackson, A. N. and Jackson, J. E. and Olson, D. L. and Mishra, B.},
abstractNote = {Through the use of electromagnetic analyses, a new non-contact sensor has been developed for in-situ determination of diffusible hydrogen content in coated linepipe steel. This electromagnetic technique allows for a rapid, non-destructive assessment of hydrogen accumulation in coated steel line pipe and thus an evaluation of the linepipe integrity. The use of induced current resistivity measurements for hydrogen content determination in X80 linepipe steel specimens is demonstrated and discussed.},
doi = {10.1063/1.2718097},
journal = {AIP Conference Proceedings},
number = 1,
volume = 894,
place = {United States},
year = {Wed Mar 21 00:00:00 EDT 2007},
month = {Wed Mar 21 00:00:00 EDT 2007}
}
  • With the introduction of new higher strength steels operating at higher pressure, the need for characterization of hydrogen content in high strength steel pipelines is timely for the pipeline industry. The higher-strength steel pipelines have higher susceptibility to hydrogen damage. Through the use of low-frequency induced current impedance measurements, a new non-contact sensor has been developed for real-time determination of diffusible hydrogen content in coated pipeline steel. A measurement scheme to separate variables associated with pipelines is discussed. This electromagnetic technique allows for a rapid, non-destructive assessment of hydrogen accumulation in coated steel line pipe and thus an evaluation ofmore » the pipeline integrity.« less
  • Nondestructive hydrogen content assessment of coated linepipe steel weldments via low frequency impedance measurements has been realized both in the laboratory and the field. A fundamental analysis of the plausibility of localized hydrogen-induced lattice strain detection in linepipe steel through low frequency impedance measurements is presented. Theoretical explanations of low frequency impedance measurements include free electron theory, quantum mechanics, and RKKY theory.
  • Threshold hydrogen concentration (C[sub th][sup H]) and threshold pH (pH[sub th]) for hydrogen-induced cracking (HIC) were determined for commercial sour service linepipe steels exposed to H[sub 2]S-saturated buffer solutions. Metallographic examination of the steel samples by optical and electron microscopy showed that ultrasonic C-scan is an effective method for detecting HIC and for locating cracks in exposed steel coupons. A banded microstructure was found to be detrimental to the HIC resistance of clean steels. The obtained pH[sub th] values can be used to rank the steels with respect to HIC resistance.
  • Using NK CR22 duplex stainless steel of 22%Cr-5.5%Ni-3%Mo, extensive research has been conducted to analyze the influence of various thermal cycles on corrosion resistance. Special attention was paid to pitting corrosion resistance in the weld heat-affected zone (HAZ) through the complicated metallurgical aspect. The optimum range of welding heat input for the improvement of pitting corrosion resistance exists in the HAZ. Lower heat input reduces the resistance near the fusion line; higher input, on the contrary, degrades the HAZ apart from the fusion line. Both of these phenomena are closely related to the sensitization of grain boundaries caused by themore » precipitation of chromium nitrides. Solution annealing is effective in providing satisfactory pitting resistance in the HAZ. Annealing at temperatures above 1100 C, however, increases pitting corrosion susceptibility by the sensitization of ferrite boundaries. The characteristics of the HAZ in the case of multi-pass welding are also mentioned, reflecting the girth welding of linepipe.« less
  • An investigation was undertaken to develop a new economical molybdenum HSLA steel for X-70 linepipe. The steel composition and processing variables studied were for production on a plate mill. It was found that a steel containing 0.07-0.09% C, 1.40-1.60% Mn, 0.20-0.35% Si, 0.13-0.17% Mo, and 0.03-0.05% Nb can be utilized for X-70 pipe. The required strength and toughness are achieved by controlled rolling with finishing temperatures in the intercritical range.