Chloride induced stress corrosion cracking of type 304 and 304L stainless steels in air

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Abstract

Chloride stress corrosion cracking (SCC) of Type 304 and 304L austenitic stainless steels (SS) was studied by a constant load method in air at a temperature of 353 K with relative humidity (RH) of 35%. Chlorides simulating sea salt particles were put on the gage section of the SS as droplets of synthetic sea water. The following stress[σap(kgf/mm2)]-minimum rupture time [tf(h)] relationships were obtained for Type 304 and 304 L SS; σap=-51 log(tf) + 153 (304 SS), σap=-141 log(tf) + 386 (304L SS). The threshold stress of SCC was as low as 1/2 of the 0.2% proof stress for solution annealed Type 304 and 304L SS, and smaller than 1/4 of the 0.2% proof stress for sensitized Type 304 SS. This result suggests the difficulty of suppressing SCC by reducing the residual tensile stress of a SS structure. SCC test using NaCl and MgCl2as chlorides suggested that MgCl2was responsible for cracking in the test condition of 353 K with RH=35%.

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Mayuzumi, M., Arai, T., & Hide, K. (2003). Chloride induced stress corrosion cracking of type 304 and 304L stainless steels in air. Zairyo to Kankyo/ Corrosion Engineering, 52(3), 166–170. https://doi.org/10.3323/jcorr1991.52.166

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