Abstract: In order to explore the corrosion resistance of stainless steel S30403 in circulating water and guide the selection of materials, this paper adopts slow strain rate tensile test, cyclic dynamic potential polarization and other methods to study the stress corrosion and pitting resistance of the material in circulating water with different chloride ion concentration and temperature. The results show that: when the medium temperature is 60 ℃ and below and the chloride ion concentration does not exceed 10 000 mg/L in circulating water, there’s no stress corrosion cracking sensitivity in S30403, which can meet the stress corrosion cracking resistance in the circulating water of water cooler; when the chloride ion concentration is higher than 250 mg/L and the temperature is 40~60 ℃ in the circulating water, there’s pitting corrosion sensitivity in S30403; under such condition, the S30403 will be at risk of pitting corrosion in long-term service.

Key words: S30403, circulating water, chlorine ion, pitting corrosion, stress corrosion cracking/SCC