To verify the safety application and use of Cr-Mo steel for the high-pressure hydrogen equipment, tensile, fatigue, and crack growth tests of JIS-G4105-1979 SCM435 and 440 steel under 45MPa high-pressure hydrogen at room temperature were conducted.…
This paper summarizes the main mechanism and influencing factors for Hydrogen Induced Cracking. The evolution of HIC test requirements over nearly 30 years for linepipe intended for sour service is reviewed. Some typical examples of the requirements…
The susceptibility of heat-treated, high-strength line pipe steels to hydrogen stress cracking (HSC) has been studied under laboratory conditions simulating cathodic protection in the field and also under actual field conditions. The rate at which…
The study of the susceptibility to hydrogen-stress cracking of heat-treated line-pipe steels has continued. Under experimental conditions that permitted stressed specimens to absorb hydrogen from only one plate surface (a condition that simulates a…
Hydrogen cracking has been and continues to be observed in both heat-affected zones and weld metals. High carbon equivalent weldment heat-affected zones (HAZ) combined with rapid cooling have been related to the development of hydrogen cracking…
The objective of this work was to determine the time interval for hydrogen induced cracking in hot tap/sleeve maintenance welding by using pipe/consumable combinations known to produce hydrogen induced cracking.
This project was undertaken to examine reports that low sulphur steels were more prone to hydrogen-induced cracking than steels with higher sulphur contents.
The susceptibility to hydrogen-induced cracking of the root pass and the baseplate was…
The objective of this research project was to demonstrate and develop a means of predicting the inspection delay time such that hydrogen cracking would not occur after inspection for in-service welds. Hydrogen cracking is an issue for in-service…
Guidelines for assuring that hydrogen levels are minimized for welds made onto in-service pipelines were developed. Many of the potential problems associated with storage and handling of low-hydrogen electrodes can be addressed at the electrode…
Program to determine the potential delay times required to cause cold cracking (hydrogen cracking). Cracking induced in welds deposited into circumferential grooves has been monitored by ultrasonic techniques. Initial use of an array of fixed…