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This paper studied the stress corrosion cracking (SCC) of EV31A in 0.1 M Na2SO4 saturated with Mg(OH)2 using linearly increasing stress tests, compared with pure Mg and WE43B. All three materials were susceptible to SCC. SCC susceptibility increased with decreasing applied stress rate. The threshold stress was 0.3 × (yield stress) for pure Mg, 0.6 × (yield stress) for EV31A, and 0.8 ×(yield stress) for WE43B. The SCC velocities at an applied stress rate of 7.3  × 10 − 4 MPa s−1 were 7.2 × 10 − 8 m s−1 for pure Mg, 5.6 × 10 − 9 m s−1 for WE43B, and 1.5 × 10 − 9 m s−1 for EV31A. Keywords: SCC (stress corrosion cracking), Magnesium alloys, LIST (linearly increasing stress test)