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Ted Mooney, P.E. RET
Pine Beach, NJ
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for Metal Finishing since 1989
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Number of Hours that SAF2507 as per ASTM A790 Can Withstand
2005
I need to know for how many hours that this material can withstand salt spray test and with what Ph value or concentration.
material : 1-1/2 inch pipe SCH 40 Grade SAF 2507 ASTM A790 or equivalent UNS S32750 as per SA790
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Pentair Water India - Goa, India
An iso-corrosion diagram, for corrosion rate 0.1 mm/year (4 mils/year) in sulfuric acid containing 2000 ppm chloride ions, for SAF 2507 is on Sandvik's website. At 35 C, sulfuric acid concentrations < 17 wt% give corrosion rates < 4 mils/year. Thus, piping with 0.145 inch thick walls might last 36 years or 315,000 hours. Lowering the acid concentration should allow a similar lifetime at higher chloride concentrations.
Ken Vlach [deceased]- Goleta, California
Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at finishing.com, continue to benefit from.
2005
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