Test Method for Hydrogen Sulfide and Sulfur Dioxide Content (Qualitative) of Industrial Aromatic Hydrocarbons

2003 ◽  
Author(s):  
Keyword(s):  
Hydrogen Sulfide ◽  
Sulfur Dioxide ◽  
Aromatic Hydrocarbons ◽  
Test Method

Hydrogen Sulfide Stress Cracking in a Q345R Welded Joint

2021 ◽  
Vol 1035 ◽  
pp. 486-491
Author(s):  
Yan Han ◽  
Jing Bin Luo ◽  
An Qing Fu ◽  
Cheng Xian Yin
Keyword(s):  
Hydrogen Sulfide ◽  
Welded Joint ◽  
Chemical Properties ◽  
Test Method ◽  
Hydrogen Atoms ◽  
Stress Cracking ◽  
Micro Cracks ◽  
Sulfide Stress ◽  
Macroscopic Observation ◽  
Metal Microstructure

In this paper the failure reason of Q345R Welded Joint was studied through macroscopic observation, chemical properties, metallurgical analysis, scanning electron microscope (SEM) and EDS test method. The results showed that there were a large number of micro-cracks in the fracture surface. The reason of cracking is severe banded structure in base metal microstructure, which provided opportunity for hydrogen atoms to enter into the internal of steel when contact with wet hydrogen sulfide environment. The existence of tensile stress promotes the entry of hydrogen atoms and the propagation of cracks. The welding products of this procedure are not suitable for use under sour conditions.

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