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US 4,374,666 AGranted
Stabilized ferritic stainless steel for preheater and reheater equipment applications
AssigneeGeneral Electric Company
InventorThomas M. Devine, Jr.
Life of this patent
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Abstract
This invention provides two stabilized corrosion resistant ferritic stainless steels particularly suitable for long term use as tubing in the service environments frequently found in moisture separator reheater and feedwater preheater equipment in the steam supply systems of commercial electrical power generating stations.
Claims1
A titanium-stabilized and corrosion-resistant ferritic stainless steel which exhibits long-time stability against sensitization at intermediate service temperatures in the as-welded condition or following a high temperature anneal consisting essentially of, in weight percent,
- ______________________________________ Carbon = 0.025% max Nitrogen = 0.025% max Carbon + Nitrogen = 0.045% max ##STR3## .gtoreq. 50 Silicon = 1.0% max Manganese = 1.0% max Phosphorous = 0.04% max Sulfur = 0.03% max Chromium = 12-13% ______________________________________
- the balance iron.
Dependencies are inferred from the claim text.