Chloride Induced Stress Corrosion Cracking of Type 304 and 304L Stainless Steels in Air
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概要
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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 353K 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[σ<SUB>ap</SUB>(kgf/mm<SUP>2</SUP>)]-minimum rupture time [ζ(h)] relationships were obtained for Type 304 and 304L SS ;<BR>σ<SUB>ap</SUB>=-51log(ζ)+153 (304 SS), <BR>σ<SUB>ap</SUB>=-141log(ζ)+386 (304L SS).<BR>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 MgCl<SUB>2</SUB> as chlorides suggested that MgCl<SUB>2</SUB> was responsible for cracking in the test condition of 353 K with RH=35%.
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