Water and Wastewater
Treated water carries residual chlorine and, in coastal or brackish supply, chlorides that concentrate under deposits. Crevice corrosion under gaskets and at flange faces is the common failure mode rather than general attack, which makes joint design and grade selection jointly responsible for service life.
What gets specified in water & wastewater
Ordered by how commonly they are called for in this sector.
- UNS S31600 / S31603316 / 316LPREN 25
304 plus 2–3% molybdenum. The standard answer to chlorides and mild acids.
- UNS S30400 / S30403304 / 304LPREN 19
The default austenitic stainless. 18% chromium, 8% nickel, no molybdenum.
- UNS S31803 / S32205 / S32550 / S32750 / S32760Duplex / Super DuplexPREN 41
Roughly equal austenite and ferrite. Around twice the yield strength of 316L.
- UNS S31254254 SMOPREN 43
6% molybdenum super-austenitic with nitrogen. PREN above 42.
Applications
05- Potable water distribution
- Treatment plant pipework and launders
- Sewage and effluent handling
- Screening and dosing equipment
- Tank and clarifier hardware
Governing standards
03- ASTM A312
- ASTM A240
- EN 10312
Verification available
10- Spectrometer
- Chemical Testing Laboratory
- Positive Material Identification (PMI)
- Spectro Test
- Tensile Testing Machine
- Hardness Testing Machine
- Portable Hardness Tester
- Flattening Test
- Reverse-Bend Test
- Hydrostatic Test Machine
What water & wastewater buys
Other industries
Supplying into water & wastewater?
Send the specification and service conditions. We will confirm the grade, the availability and the documentation you will need.