CTOAC of typical X70, X80 and X90 pipeline steels plates were evaluated by using energy based regression method upon their single specimen. Clear difference in the material resistance to ductile cracking could be distinguished by the values of CTOAC and their characteristic fracture surface. The region of stable cracking on the fracture surface could be identified from the dynamic crack extensi...

Hydrogen uptake in steel structures can cause a degradation mechanical properties such as toughness, and induce cracks. This phenomenon is widely known hydrogen embrittlement. For structural steels subjected to cathodic protection or pipelines transporting high-pressure gas, embrittlement represents an important challenge. Charpy V-notch testing provides fast inexpensive method for quantifying ...

Welding costs associated with the laying of pipes for deepwater oil and gas extraction can be reduced using high interpass temperatures (ITs). However, a IT decrease mechanical properties heat-affected zone (HAZ) welded joints. With use strength-toughness steels, this may an acceptable trade-off. Therefore, it is necessary to evaluate influence ITs on HAZ. The coarse-grain HAZ (CGHAZ) intercrit...