Hydrogen Cracking Initiation of a High-Strength Steel Weldment

2009 ◽  
pp. 202-202-21 ◽  
Author(s):  
PA Klein ◽  
RA Hays ◽  
PJ Moran ◽  
JR Scully
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Hydrogen Cracking ◽  
Steel Weldment

Hydrogen Cracking During Service of High Strength Steel Cannon Components

2009 ◽  
pp. 897-897-16
Author(s):  
JH Underwood ◽  
E Troiano ◽  
GN Vigilante ◽  
AA Kapusta ◽  
S Tauscher
Keyword(s):  
High Strength Steel ◽  
High Strength ◽  
Hydrogen Cracking

scholarly journals Prediction Model for Weld Hydrogen Cracking in High Strength Steel Weld

2019 ◽  
Vol 22 (2) ◽  
pp. 138-138
Author(s):  
Nobuyuki Ishikawa ◽  
Yuya Sato ◽  
A. Toshimitsu Yokobori Jr. ◽  
Tadashi Kasuya ◽  
Satoshi Minamoto ◽  
...  
Keyword(s):  
Prediction Model ◽  
High Strength Steel ◽  
High Strength ◽  
Steel Weld ◽  
Hydrogen Cracking

Effect of Heat Treatment on Corrosion and Fracture Behavior of SPV50Q High Strength Steel Weldment in H2S-Containing Environment

2008 ◽  
Author(s):  
Jianqun Tang ◽  
Jian-Ming Gong ◽  
Luyang Geng ◽  
Jiang Yong
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Residual Stress ◽  
High Strength Steel ◽  
Fracture Behavior ◽  
High Strength ◽  
Optical Microscope ◽  
Welding Residual Stress ◽  
Liquefied Petroleum Gas ◽  
Steel Weldment

SPV50Q high strength steel is often used to fabricate liquefied petroleum gas (LPG) spherical tanks with larger capacity, and tanks are expected to free post weld heat treatment (PWHT) for avoiding the possible reduction in strength. Sulfide stress corrosion cracking (SSCC), however, has been found in weldment, especially the heat-affected zone (HAZ), in LPG environment contaminated by wet H2S. The failure analysis showed that the existence of welding residual stress in weldment is one of the major factors in the occurrence of cracking. Post welding heat treatment (PWHT) is a feasible method of reducing welding residual stress. Therefore, in order to investigate the effect of heat treatment on mechanical properties, corrosion and fracture behavior of SPV50Q steel weldment, the difference in mechanical properties of the weldment with and without heat treatment at 590°C for 160 min after welding was measured using tensile test and impact test. The corrosion behaviors of base metal (BM), weld metal (WM) and HAZ metal in the weldment were investigated by potentiodynamic polarization in H2S-containing solution. In the same solution, the susceptibility to environmental cracking was evaluated by slow strain rate testing (SSRT). The feature of fracture and the morphologies of cracks were observed by scanning electrode microscope (SEM) and optical microscope (OP). The results indicate that the execution of heat treatment does not greatly change the properties of SPV50Q steel weldment, which can provide technology support for the remanufacturing of the LPG tanks having suffered from SSCC by repair welding following local or integral heat treatment.

Evaluation of Cracking Behavior of SPV50Q High Strength Steel Weldment in Wet H2S Containing Environment

2005 ◽  
Vol 297-300 ◽  
pp. 951-957 ◽  
Author(s):  
Jian Ming Gong ◽  
Jian Qun Tang ◽  
Xian Chen Zhang ◽  
Shan Tung Tu
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
High Strength Steel ◽  
High Strength ◽  
Post Weld Heat Treatment ◽  
Welding Residual Stress ◽  
Cracking Behavior ◽  
Steel Weldment ◽  
Hydrogen Induced Cracking ◽  
Weld Heat

JIS-SPV50Q high strength steel is often employed in construction of liquid petroleum gas (LPG) spherical tanks due to its high strength and good ductility. In general, post weld heat treatment is not performed after welding of SPV50Q high strength steel and welding residual stress will be retained in weldment. Service experience and inspection indicate that higher H2S concentration and welding residual stress result in the environmental failure, such as blistering or hydrogen induced cracking (HIC), sulfide stress corrosion cracking (SSCC) and stress oriented hydrogen induced cracking (SOHIC). In the present paper, the cracking behavior of SPV50Q high strength steel weldment by manual electric arc welding has been investigated in various saturate solutions with different concentrations of H2S. The results of slow strain rate testing, performed at a strain of 1×10-6s-1, reveal the presence of SSCC and HIC in the base metal adjacent to HAZ. The ffects of the different temperatures of post weld heat treatment on cracking are discussed. The suitable post weld heat treatment could increase the resistance of SPV50Q weldment on SSCC or HIC and does not decrease the mechanical properties of SPV50Q weldment.

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