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sulphate attack on stainless steel pipe

I have a client questioning the different of chloride attack vs sulphate attack on the stainless steel pipe. As I know, the stainless steel 304 will suitable only for fluids with chloride below 200ppm and stainless steel 316 with chloride below 1000ppm. Is that true ? So, what is the concentration limit for sulphate if we use stainless steel 304 and 316 ? Is that any reference for this type of corrosion data we can refer to ?

Theng WoeiChyuan
- Kuala Lumpur, Malaysia
2002

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