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Blackening treatment of SS 316 / 304 for best solar absorption

Stainless steel is a inexpensive and high strength material for heat absorption in concentrated solar energy receiver. For good efficiency, the emissivity of surface should be highest possible - that is, it should be jet black. Typical operating temperature expected is up to 450 °C (840 F). What is economical process to obtain such a black surface on the SS 316 / 304 tubes ? Can it be as simple as heating in controlled atmosphere ?

Pravin Salinkar
Product Designer - Mumbai, India
January 30, 2009

Facing a similar problem, any suggestions.

Nachiket Gandhi
- India
February 10, 2009

March 6, 2009

You can find extensive information about available Temperature Solar Selective Absorber Materials in the following link :

www.nrel.gov/csp/troughnet/pdfs/31267.pdf

Good luck,

Gabriel Schonwald
Bnei Berak, Israel

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