Wrought stainless steel compositions having engineered microstructures for improved heat resistance

US7258752B2 · kind B2 · utility

Assignee

• UT-BATTELLE, LLC · US

Inventors

• Philip J. Maziasz · Oak Ridge, US
• Robert W. Swindeman · Oak Ridge, US
• Bruce A. Pint · Knoxville, US
• Michael L. Santella · Knoxville, US
• Karren More · Knoxville, US

Key dates

• Filing date: Mar 26, 2003
• Grant date: Aug 21, 2007
• Expiry date: Jul 30, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F28F21/083
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A wrought stainless steel alloy composition includes 12% to 25% Cr, 8% to 25% Ni, 0.05% to 1% Nb, 0.05% to 10% Mn, 0.02% to 0.15% C, 0.02% to 0.5% N, with the balance iron, the composition having the capability of developing an engineered microstructure at a temperature above 550° C. The engineered microstructure includes an austenite matrix having therein a dispersion of intragranular NbC precipitates in a concentration in the range of 1010 to 1017 precipitates per cm3.