Pure steam-related apparatus protected from fouling and method o

Details Pure steam-related apparatus protected from fouling and method o Pure steam-related apparatus protected from fouling and method o

1998-05-14

2000-11-21

Jones, Deborah

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

148286, 148287, 148516, 148519, 148537, 201 18, 2022671, 203 86, 428628, 428629, 4284721, 42847222, B32B 1518, C23C 2200

Patent

active

061500402

ABSTRACT:
A pure steam-related apparatus, which is one of apparatus in the group of pure steam generators generating pure steam from purified water, pipelines for pure steam and sterilizers using pure steam, is protected from discoloration, so-called "fouling", to red or black caused by contact with the pure steam. The apparatus is manufactured by using an austenitic stainless steel sheet as the material, by taking the blanks from the material which received no mechanical surface polishing, by deforming and welding, without electrolytic polishing customarily done, and by passivating the surface to contact pure water to increase Cr-content in the passivation film to such extent as 45 atomic % or higher, preferably 55 atomic % or higher. Better results will be obtained by ensuring Cr/Fe ratio in the passivation film at the level of 1.45 or higher, preferably, 1.70 or higher.

REFERENCES:
patent: 2357219 (1944-08-01), Mott
patent: 2442223 (1948-05-01), Uhlig
patent: 4518440 (1985-05-01), Phillips, Jr.

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