Heat treated 9 Cr-1 Mo steel material for high temperature application
Abstract
The invention relates to a composition and heat treatment for 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 novel combination of composition and heat treatment produces a heat treated material containing both large primary titanium carbides and small secondary titanium carbides. The primary titanium carbides contribute to creep strength while the secondary titanium carbides act to maintain a higher level of chromium in the finished steel for increased oxidation resistance, and strengthen the steel by impeding the movement of dislocations through the crystal structure. The heat treated material provides improved performance at comparable cost to commonly used high-temperature steels such as ASTM P91 and ASTM P92, and requires heat treatment consisting solely of austenization, rapid cooling, tempering, and final cooling, avoiding the need for any hot-working in the austenite temperature range.
- Inventors:
- Issue Date:
- Research Org.:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1176476
- Patent Number(s):
- 8246767
- Application Number:
- 12/209,488
- Assignee:
- The United States of America, as represented by the United States Department of Energy (Washington, DC)
- Patent Classifications (CPCs):
-
C - CHEMISTRY C21 - METALLURGY OF IRON C21D - MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS
C - CHEMISTRY C22 - METALLURGY C22C - ALLOYS
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 2008 Sep 12
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Jablonski, Paul D., Alman, David, Dogan, Omer, Holcomb, Gordon, and Cowen, Christopher. Heat treated 9 Cr-1 Mo steel material for high temperature application. United States: N. p., 2012.
Web.
Jablonski, Paul D., Alman, David, Dogan, Omer, Holcomb, Gordon, & Cowen, Christopher. Heat treated 9 Cr-1 Mo steel material for high temperature application. United States.
Jablonski, Paul D., Alman, David, Dogan, Omer, Holcomb, Gordon, and Cowen, Christopher. Tue .
"Heat treated 9 Cr-1 Mo steel material for high temperature application". United States. https://www.osti.gov/servlets/purl/1176476.
@article{osti_1176476,
title = {Heat treated 9 Cr-1 Mo steel material for high temperature application},
author = {Jablonski, Paul D. and Alman, David and Dogan, Omer and Holcomb, Gordon and Cowen, Christopher},
abstractNote = {The invention relates to a composition and heat treatment for 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 novel combination of composition and heat treatment produces a heat treated material containing both large primary titanium carbides and small secondary titanium carbides. The primary titanium carbides contribute to creep strength while the secondary titanium carbides act to maintain a higher level of chromium in the finished steel for increased oxidation resistance, and strengthen the steel by impeding the movement of dislocations through the crystal structure. The heat treated material provides improved performance at comparable cost to commonly used high-temperature steels such as ASTM P91 and ASTM P92, and requires heat treatment consisting solely of austenization, rapid cooling, tempering, and final cooling, avoiding the need for any hot-working in the austenite temperature range.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 21 00:00:00 EDT 2012},
month = {Tue Aug 21 00:00:00 EDT 2012}
}