Steel 34CrMo4 is commonly used for a variety of high strength application in many industrial areas. Some of such applications are exposed to environment containing H2S and high humidity that can cause the SSC issue. Among such applications, high strength tubes, pipes and also high pressure steel cylinders belong. To prevent any possible failure of above mentioned applications, variety of destructive methods can be applied e.g. tensile testing, CVN testing and microstructural observations. However, such procedures demand the component extraction with subsequent samples preparations. All of these methods are highly cost inefficient and take significant amount of time. As an alternative method to detect a possible initiation and propagation of SSC, the AE testing and observation takes place. This method is one of a few possible in-situ methods to precisely distinguish early phases and propagation phases of such degradation process. This paper is focused on in-situ observation of entire SSC during simulated accelerated test on 34CrMo4 of strength reaching to 1215 MPa.Keywords: 34CrMo4, sulphide stress cracking, mechanical properties, fracture surface, acoustic emission
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