Fatigue Testing of Pipeline Welds and Heat-Affected Zones in Pressurized Hydrogen Gas

Abstract

Several welds and associated heat-affected zones (HAZs) on two API X70 and two API X52 pipes were tested to determine the fatigue crack growth rate (FCGR) in pressurized hydrogen gas and assess the area of the pipe that was most susceptible to fatigue when subjected to hydrogen gas. The relationship between FCGRs for welds and HAZs compared to base metal is discussed relative to local residual stresses, differences in the actual path of the crack, and hydrogen pressure effects.

Effect of Hydrogen in Mixed Gases on the Mechanical Properties of Steels—Theoretical Background and Review of Test Results

“…(d) Relative fracture toughness (K) for X52 and X80 steels data from [39][40][41][42][43][44][45]. (e) Relative crack growth rate for X52 and (f) Relative crack growth rate for X70 as well as X80 steels data from [9,36,40,42,44,[46][47][48][49][50][51][52][53][54].…”