Proceedings of the 5th International Conference on Metals & Hydrogen A03

Proceedings of the 5th International Conference on Metals & Hydrogen A03

Mechanical performance of subsea pipeline steels for hydrogen transport application

A. Alvaro (*) * (1)1 , A. O. Myhre (2)2 , A.B. Hagen (1)1 , D. Wang (2)2 , B. Nyhus (1)1 , E.A. Koren (2)2 , M. Lin (2)2 , H. Matsunaga (3)3 , R. Johnsen (2)2 , A. Vinogradov (2)2 , Z. Zhang (2)2 , V. Olden (1)1

  • (1) 1

    Department of Materials and Nanotechnology, SINTEF Industry, 7456 Trondheim, Norway

  • (2) 2

    Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology, Richard Birkelands vei 2B, 7491 Trondheim, Norway

  • (3) 3

    Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

  • (*) *

    (corresponding author)
    Antonio.Alvaro@sintef.no

Abstract

The mechanical performance in hydrogen environment of two pipeline steel base materials, a vintage and a modern X65, was investigated through in-situ electrochemically charged hydrogen testing. A series of tests was carried out to evaluate the hydrogen-induced degradations: (i) ductility loss in slow strain rate tensile testing, (ii) reduction in the crack-growth resistance under quasi-static loading conditions and (iii) acceleration of fatigue crack-growth under cyclic loading. The experimental results obtained in terms of Embrittlement Index (EI), CTOD values and fatigue crack-growth rate (FCGR) curves are compared with those available in standards and literature.

Introduction


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