Low-cost cast creep-resistant austenitic stainless steels that form alumina for high temperature oxidation resistance

US11193190B2 · kind B2 · utility

Assignee

• UT-BATTELLE, LLC · US

Inventors

• Philip J. Maziasz · Oak Ridge, US
• Govindarajan Muralidharan · Knoxville, US
• Bruce A. Pint · Knoxville, US
• Kinga A. Unocic · Knoxville, US
• Ying Yang · Knoxville, US

Key dates

• Filing date: Jul 12, 2019
• Grant date: Dec 7, 2021
• Expiry date: Jul 12, 2039

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C38/48
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

An air castable Fe-based stainless steel alloy comprises in weight % based on the total weight of the alloy 18-22% Cr, 15-22% Ni, 3-6% Al, 0.5-5% Mn, 0-3.5% W, 0-5% Cu, 0-2% Si, 1-2.5% Nb, 0.3-0.6% C balance Fe wherein, Cu+W+Si=0.5-10.5, and the alloy provides an oxidation resistance of 0.5<specific mass change<+2 mg/cm2 after 400 one hour cycles at 900° C. in 10% water vapor.