Experimental Study on Chloride Stress Corrosion Cracking Sensitivity of 316L Stainless Steel

Abstract

The slow–strain-rate tensile test was used to study the chloride stress corrosion cracking (SSC) behavior of 316L stainless steel under the simulated condition of a CO2 gas field in the Tarim Basin, and the effects of CO2, Cl− concentration, and temperature on the sensitivity of SCC were discussed. The results show that the increase of CO2 content has no apparent influence on the chloride SCC sensitivity of 316L stainless steel. With the rise in temperature, chloride SCC’s sensitivity increases, and the change in the SCC sensitivity index Iscc is noticeable. When the concentration of Cl− increases, the sensitivity of chloride SCC also increases. The degree of influence of the three factors on the experimental results can be ranked as follows: temperature>Cl− > CO2. In this experiment, when the partial pressure of CO2 is 0.1 MPa, the temperature is 65°C, the concentration of Cl− is 1,20,000 mg/L, and Iscc of 316L tensile samples has a maximum of 26.8%.