Evaluating Hydrogen Stress Cracking of Line Pipe Steels under Cathodic Protection Using Crack Tip Opening Displacement Tests

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概要

• 論文の詳細を見る

• Crack tip opening displacement (CTOD, δ) tests were carried out for line pipe steels in buffer solutions, sand, and clay to evaluate initiation of hydrogen stress cracking (HSC) at surface defects in buried pipelines under cathodic protection. Four series of line pipe steels and two series of seam welds showed a similar tendency in cathodic current density (i) versus the critical CTOD (δ_C) curves, irrespective of types, pH and water content of the soils; δ_C showed a minimum (δ_<HSC>) when i>i_<th> (i_<th>=1mA/(cm)^2) in all the testing conditions. δ_<HSC> increased with the increasing fracture toughness of the steel. Fluctuation of cathodic current density influenced δ_C when the maximum value of cathodic current density (i_<max>) was larger than i_<th>. HSC could be initiated at surface defects in pipelines only when i_<max>>i_<th> and δ≩δ_<HSC>.

• 一般社団法人日本機械学会の論文
• 2001-04-15

著者

• Hagiwara Naoto

  Fundamental Technology Laboratory Tokyo Gas Co. Ltd.

• Meyer Michel

  Dilection De La Recherche Depatrment Reseaux Pole Techniques De Transport

関連論文

• Fatigue Behavior of Steel Pipes Containing Idealized Flaws under Fluctuating Pressure
• Evaluating Hydrogen Stress Cracking of Line Pipe Steels under Cathodic Protection Using Crack Tip Opening Displacement Tests

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