Effect of tensile stress in elastic and plastic range on hydrogen permeation of high-strength steel in sour environment

2012 ◽  
Vol 78 ◽  
pp. 139-146 ◽  
Author(s):  
Sung Jin Kim ◽  
Hwan Gyo Jung ◽  
Kyoo Young Kim
Keyword(s):  
Tensile Stress ◽  
High Strength Steel ◽  
Hydrogen Permeation ◽  
High Strength ◽  
Plastic Range

scholarly journals Effects of Adding CO2 to Low Level H2S Containing Aqueous Environments on the Corrosion and Hydrogen Penetration Behaviors of High-Strength Steel

2021 ◽  
Vol 59 (8) ◽  
pp. 533-544
Author(s):  
Seung Min Ryu ◽  
Jin-seong Park ◽  
Hye Rin Bang ◽  
Sung Jin Kim
Keyword(s):  
Aqueous Solution ◽  
High Strength Steel ◽  
Hydrogen Permeation ◽  
High Strength ◽  
Steel Sample ◽  
Aqueous Environment ◽  
Hydrogen Atoms ◽  
Low Level ◽  
Low Concentrations ◽  
Hydrogen Penetration

The effects of adding CO2 to low level H2S containing aqueous environment on the corrosion and hydrogen penetration behaviors of high-strength steel were evaluated using a range of experimental and analytical methods. The corrosion rate of the steel sample exposed to a low level of H2S dissolved in an aqueous solution was comparatively higher than the one exposed to a mixture of low concentrations of H2S with CO2 dissolved in the aqueous solution. The higher corrosion resistance of the steel in the mixture of low concentrations of H2S and CO2 was attributed primarily to the three-layer structure of corrosion scale, comprised of an outer Fe-oxide, middle FeS1-X, and inner FeCO3, which formed on the steel sample. In particular, the formation of a thin FeCO3 layer with protective and non-conductive nature may serve as an effective barrier against the penetration of aggressive ionic species in solution, as well as hydrogen atoms formed by cathodic reduction or hydrolysis reactions. Consequently, the hydrogen permeation level, which was measured in a mixture of low-level H2S and CO2, was controlled to a comparatively lower value. Nevertheless, the higher level of hydrogen permeation in a mixture of low levels of H2S and CO2 at the early corrosion stage might increase the potential risk of pre-mature failure by hydrogen-assisted cracking.

Research of Hydrogen Atom Penetration during the Phosphorization Process of High-Strength Steel

2014 ◽  
Vol 540 ◽  
pp. 35-38
Author(s):  
Yu Su Song ◽  
Li Qing Zhou ◽  
Guang Zhe Chu
Keyword(s):  
Hydrogen Atom ◽  
Hydrogen Embrittlement ◽  
Metal Surface ◽  
High Strength Steel ◽  
Steel Surface ◽  
Hydrogen Permeation ◽  
High Strength ◽  
Hydrogen Gas ◽  
Hydrogen Atoms ◽  
Permeation Experiment

The hydrogen residued process of the High-strength steel surface during the phosphorization process was studied. By the hydrogen permeation experiment, that penetration speed of the hydrogen residued in the metal surface were measured. The result of shows:the more hydrogen gas generated in the process of phosphorization,the more hydrogen atom inside the metal. That means the hydrogen embrittlement criticality of the High-strength steel were more fearful。Dense phosphorizing film always block hydrogen atoms to penetrate into the metal,So that cuold to reduce the hydrogen embrittlement extend of the steel in phosphorization.

Cyclic Behavior of High Strength Steel H-Shaped Beam

2012 ◽  
Vol 174-177 ◽  
pp. 159-165 ◽  
Author(s):  
Takuma Shinohara ◽  
Ryota Suekuni ◽  
Kikuo Ikarashi
Keyword(s):  
Seismic Design ◽  
High Strength Steel ◽  
Slenderness Ratio ◽  
High Strength ◽  
Thickness Ratio ◽  
Cyclic Behavior ◽  
Plastic Range ◽  
Limit Value ◽  
Loading Tests ◽  
The Stability

This study is intended to show possibility of using high strength steel for H-shaped beams with large depth-thickness ratio in the elastic range by conducting loading tests. Test specimens are manufactured with high strength steel of over 700N/mm2 yield stress. Elastic behaviors of such beams under cyclic loading are mainly concerned. In addition, the redundancy and the stability of these beams in plastic range are investigated. It is shown that these beams are useful as seismic design beams although the depth-thickness ratio of H-shaped beams is larger than the limit of current standards in Japan. Also, by referring to a recent study, a new limit value of plate slenderness ratio (depth-thickness ratio of web plate and width-thickness ratio of flange plate) is proposed.

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