Hydrogen induced cracking behaviors of X70 pipeline steel and its welds under electrochemical charging

Yingrui Zhang; Chaofang Dong; Xiaogang Li; Xiaolong Rui; Herong Zhou

Hydrogen induced cracking behaviors of X70 pipeline steel and its welds under electrochemical charging

Yingrui Zhang^*
, Chaofang Dong
, Xiaogang Li
, Xiaolong Rui
, Herong Zhou

^*Corresponding author for this work

University of Science and Technology Beijing
CAS - Institute of Metal Research

Research output: Contribution to journal › Article › peer-review

30 Scopus citations

Abstract

The hydrogen induced cracking (HIC) of X70 pipeline steel was studied in H₂SO₄ solutions with different concentrations by means of electrochemical charging. Larger current densities, longer charging time and lower pH values of solution would promote the hydrogen atoms to enter into X70 steel. Non-metallic inclusions such as nitrides and oxides play different roles in HIC of X70 steel. Microscopic observation showed that there is no dependent relation between cracks induced by hydrogen and the inclusions of nitrides. Otherwise, the oxides of magnesium, aluminum and calcium etc are more harmful as the sources of hydrogen induced cracks. According to the results of hydrogen permeation test, the effective diffusivity (D_eff) of hydrogen at room temperature is 3.34 × l0^-9 cm²/s. Tensile specimens of X70 steel and welds showed severe plasticity loss after hydrogen charging, while the welds have lower plasticity than that of X70 base metal.

Original language	English
Pages (from-to)	521-527
Number of pages	7
Journal	Jinshu Xuebao/Acta Metallurgica Sinica
Volume	42
Issue number	5
State	Published - May 2006
Externally published	Yes

Keywords

Hydrogen induced cracking
Hydrogen permeation
Weld
X70 pipeline steel

Cite this

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title = "Hydrogen induced cracking behaviors of X70 pipeline steel and its welds under electrochemical charging",

abstract = "The hydrogen induced cracking (HIC) of X70 pipeline steel was studied in H2SO4 solutions with different concentrations by means of electrochemical charging. Larger current densities, longer charging time and lower pH values of solution would promote the hydrogen atoms to enter into X70 steel. Non-metallic inclusions such as nitrides and oxides play different roles in HIC of X70 steel. Microscopic observation showed that there is no dependent relation between cracks induced by hydrogen and the inclusions of nitrides. Otherwise, the oxides of magnesium, aluminum and calcium etc are more harmful as the sources of hydrogen induced cracks. According to the results of hydrogen permeation test, the effective diffusivity (Deff) of hydrogen at room temperature is 3.34 × l0-9 cm2/s. Tensile specimens of X70 steel and welds showed severe plasticity loss after hydrogen charging, while the welds have lower plasticity than that of X70 base metal.",

keywords = "Hydrogen induced cracking, Hydrogen permeation, Weld, X70 pipeline steel",

author = "Yingrui Zhang and Chaofang Dong and Xiaogang Li and Xiaolong Rui and Herong Zhou",

year = "2006",

month = may,

language = "英语",

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journal = "Jinshu Xuebao/Acta Metallurgica Sinica",

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TY - JOUR

T1 - Hydrogen induced cracking behaviors of X70 pipeline steel and its welds under electrochemical charging

AU - Zhang, Yingrui

AU - Dong, Chaofang

AU - Li, Xiaogang

AU - Rui, Xiaolong

AU - Zhou, Herong

PY - 2006/5

Y1 - 2006/5

N2 - The hydrogen induced cracking (HIC) of X70 pipeline steel was studied in H2SO4 solutions with different concentrations by means of electrochemical charging. Larger current densities, longer charging time and lower pH values of solution would promote the hydrogen atoms to enter into X70 steel. Non-metallic inclusions such as nitrides and oxides play different roles in HIC of X70 steel. Microscopic observation showed that there is no dependent relation between cracks induced by hydrogen and the inclusions of nitrides. Otherwise, the oxides of magnesium, aluminum and calcium etc are more harmful as the sources of hydrogen induced cracks. According to the results of hydrogen permeation test, the effective diffusivity (Deff) of hydrogen at room temperature is 3.34 × l0-9 cm2/s. Tensile specimens of X70 steel and welds showed severe plasticity loss after hydrogen charging, while the welds have lower plasticity than that of X70 base metal.

AB - The hydrogen induced cracking (HIC) of X70 pipeline steel was studied in H2SO4 solutions with different concentrations by means of electrochemical charging. Larger current densities, longer charging time and lower pH values of solution would promote the hydrogen atoms to enter into X70 steel. Non-metallic inclusions such as nitrides and oxides play different roles in HIC of X70 steel. Microscopic observation showed that there is no dependent relation between cracks induced by hydrogen and the inclusions of nitrides. Otherwise, the oxides of magnesium, aluminum and calcium etc are more harmful as the sources of hydrogen induced cracks. According to the results of hydrogen permeation test, the effective diffusivity (Deff) of hydrogen at room temperature is 3.34 × l0-9 cm2/s. Tensile specimens of X70 steel and welds showed severe plasticity loss after hydrogen charging, while the welds have lower plasticity than that of X70 base metal.

KW - Hydrogen induced cracking

KW - Hydrogen permeation

KW - Weld

KW - X70 pipeline steel

UR - https://www.scopus.com/pages/publications/33746503284

M3 - 文章

AN - SCOPUS:33746503284

SN - 0412-1961

VL - 42

SP - 521

EP - 527

JO - Jinshu Xuebao/Acta Metallurgica Sinica

JF - Jinshu Xuebao/Acta Metallurgica Sinica

IS - 5

ER -

Hydrogen induced cracking behaviors of X70 pipeline steel and its welds under electrochemical charging

Abstract

Keywords

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