Combined Effect of Temper and Hydrogen Embrittlement on Threshold for Hydrogen Induced Fracture in Cr Mo Steels

Abstract

This paper presents the results of the research activities of the subcommittee on hydrogen embrittlement of the Japan Pressure Vessel Research Council (JPVRC). The combined effect of temper embrittlement and hydrogen embrittlement in CrMo steels is discussed. It has been recognized that CrMo steels used widely in the refining and petrochemical industry are quite susceptible to temper embrittlement. Although the synergistic relation between temper embrittlement and hydrogen embrittlement is a matter of major concern, studies regarding this subject are rarely encountered. Task group VIII (TG8) of the JPVRC conducted fracture toughness tests for three kinds of 2.25Cr1Mo steels and 2.25Cr1Mo0.3 V steel. These steels were prepared by subjecting them to normalizing, tempering, and postweld heat treatments (PWHTs) which simulated actual conditions. Some specimens were embrittled by step cooling (Socal1 treatment). It was found that the threshold for hydrogeninduced fracture was lowered when the specimen was exposed to pressurized hydrogen gas (15 MPa) for 48 h at 450 آ°C and there was no marked indication of the synergistic action concerning this embrittlement.