Stress corrosion cracking (SCC) behavior of 35CrMo low alloy steel and 00Cr13Ni5Mo stainless steel in hydrogen sulfide environment was investigated by using slowstrainrate test (SSRT)

U-bent-specimen immersion test and electrochemincal polarization techniqueBoth 35CrMo steel and 00Cr13Ni5Mo steel were susceptible to SCC in various H2 s solutions

and their SCC susceptibilities reduced with the increase of pH value within 3.0 and 4.5 or the decrease of H2 s concentration from saturation to 1000 μg·g-100Cr13Ni5Mo steel was less susceptible to SCC than 35CrMo steel in each tested H2 S condition

but its SCC susceptibility was affected more evidently by the change of pH value than that of 35CrMo steelThe SCC susceptibility factor of 00Cr13Ni5Mo steel was close to that of 35CrMo steel in solutions with lower pH values

while in solution with a pH value of 4.5

the resistance of 00Cr13Ni5Mo stainless steel to hydrogen sulfide stress corrosion cracking was much higher than that of 35CrMoIt was due to the higher concentration of some anticorrosive elements

such as Cr

in 00Cr13Ni5Mo

that promoted the formation of a more stable passive film

leading to a higher hydrogen induced cracking (HIC) resistance of 00Cr13Ni5Mo than 35CrMo in higherpH conditions.