Thermomechanical treatment consisting of carbide stabilizing aging of cold worked materials followed by low temperature recrystallization heating (SAR process) made the standard stainless steels highly resistant to intergranular corrosion and cracking in otherwise susceptible environments. After various reheating thermal exposure several kinds of IGC and IGSCC susceptibility tests were made on the optimized SAR treated materials to see the critical conditions for the microstructural stability. The microstructural stability was maintained up to 825C and 875C in Types 304 SAR and 316 SAR respectively. SAR treated materials showed no IGC and IGSCC susceptibility under the SSRT in 288C oxygenated pure water, under the constant load tests in boiling 20% MgC12 solution and in the hot corrosion environment. In addition, the improved mechanical strength of SAR treated materials relative to the conventional materials is one of the advantages to maintain high strength in those environments.

Stainless‐steel piping can be cost‐effective for potable water use. Stainless steel has been used extensively for potable water since the mid‐1960s in desalination plants for handling product water; in potable water treatment plants for gravity filtration and piping; in Tokyo, Japan, for small‐diameter household connection piping; and in New York City for large‐diameter risers and other piping. The most familiar use of stainless steel is for drinking fountains. Background information and general data are given on types 304 (UNS S30400) and 316 (S31600) stainless steel, and their current use in potable water applications is reported. The behavior of stainless steel used with raw, chlorinated, and finished water as well as of piping buried in soil is reviewed. Postfabrication cleanup and maintenance of exterior appearance and cleanliness are also reviewed. Guidelines for procurement and successful use are suggested.

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