Patent Number: 8,317,944

Title: 9 Cr-- 1 Mo steel material for high temperature application

Abstract: One or more embodiments relates to a high-temperature, titanium alloyed, 9 Cr-1 Mo steel exhibiting improved creep strength and oxidation resistance at service temperatures up to 650.degree. C. The 9 Cr-1 Mo steel has a tempered martensite microstructure and is comprised of both large (0.5-3 .mu.m) primary titanium carbides and small (5-50 nm) secondary titanium carbides in a ratio of. from about 1:1.5 to about 1.5:1. The 9 Cr-1 Mo steel may be fabricated using exemplary austenizing, rapid cooling, and tempering steps without subsequent hot working requirements. The 9 Cr-1 Mo steel exhibits improvements in total mass gain, yield strength, and time-to-rupture over ASTM P91 and ASTM P92 at the temperature and time conditions examined.

Inventors: Jablonski; Paul D. (Salem, OR), Alman; David (Corvallis, OR), Dogan; Omer (Corvallis, OR), Holcomb; Gordon (Albany, OR), Cowen; Christopher (Albany, OR)

Assignee: U.S. Department of Energy

International Classification: C22C 38/00 (20060101)

Expiration Date: 2021-11-27 0:00:00