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

United States Patent

November 27, 2012
View the Complete Patent at the US Patent & Trademark Office
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Improved Martensitic Steel for High Temperature Applications
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 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.
Jablonski; Paul D. (Salem, OR), Alman; David (Corvallis, OR), Dogan; Omer (Corvallis, OR), Holcomb; Gordon (Albany, OR), Cowen; Christopher (Albany, OR)
U.S. Department of Energy (Washington, DC)
13/ 282,211
October 26, 2011
GOVERNMENT INTERESTS The United States Government has rights in this invention pursuant to the employer-employee relationship of the Government to the inventors as U.S. Department of Energy employees mid site-support contractors at the National Energy Technology Laboratory.