The influence of testing methodology and changes of microstructural parameters on resistance of duplex steel to sulphide stress cracking

摘要

The paper is focused on the evaluation of duplex ferritic-austenitic steel resistance to sulphide stress cracking (SSC).The testing was performed in accordance with the NACE TM 0177 Standard using tensile tests and four-point bendingtests. The steel was always tested in two diff erent structural states, in the as-received state (marked as AR), andafter laboratory annealing by the mode of 800 °C/5h/air (marked as AN). Microstructure of steel in the AR state wasformed by ferrite and austenite, the AN state was characterized by an disintegration of the part of ferrite and byformation of brittle σ phase. The aim of this study was to evaluate the eff ect of testing methodologies and changesof microstructural parameters of duplex steel resistance to SSC.