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Title: Heat and corrosion resistant cast CF8C stainless steel with improved high temperature strength and ductility

Abstract

A CF8C type stainless steel alloy and articles formed therefrom containing about 18.0 weight percent to about 22.0 weight percent chromium and 11.0 weight percent to about 14.0 weight percent nickel; from about 0.05 weight percent to about 0.15 weight percent carbon; from about 2.0 weight percent to about 10.0 weight percent manganese; and from about 0.3 weight percent to about 1.5 weight percent niobium. The present alloys further include less than 0.15 weight percent sulfur which provides high temperature strength both in the matrix and at the grain boundaries without reducing ductility due to cracking along boundaries with continuous or nearly-continuous carbides. The disclosed alloys also have increased nitrogen solubility thereby enhancing strength at all temperatures because nitride precipitates or nitrogen porosity during casting are not observed. The solubility of nitrogen is dramatically enhanced by the presence of manganese, which also retains or improves the solubility of carbon thereby providing additional solid solution strengthening due to the presence of manganese and nitrogen, and combined carbon.

Inventors:
; ; ; ;
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1176712
Patent Number(s):
RE41504
Application Number:
12/230,179
Assignee:
Caterpillar Inc. (Peoria, IL)
DOE Contract Number:  
AC05-96OR2264
Resource Type:
Patent
Resource Relation:
Patent File Date: 2008 Aug 25
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Maziasz, Philip J., McGreevy, Tim, Pollard, Michael James, Siebenaler, Chad W., and Swindeman, Robert W.. Heat and corrosion resistant cast CF8C stainless steel with improved high temperature strength and ductility. United States: N. p., 2010. Web.
Maziasz, Philip J., McGreevy, Tim, Pollard, Michael James, Siebenaler, Chad W., & Swindeman, Robert W.. Heat and corrosion resistant cast CF8C stainless steel with improved high temperature strength and ductility. United States.
Maziasz, Philip J., McGreevy, Tim, Pollard, Michael James, Siebenaler, Chad W., and Swindeman, Robert W.. Tue . "Heat and corrosion resistant cast CF8C stainless steel with improved high temperature strength and ductility". United States. https://www.osti.gov/servlets/purl/1176712.
@article{osti_1176712,
title = {Heat and corrosion resistant cast CF8C stainless steel with improved high temperature strength and ductility},
author = {Maziasz, Philip J. and McGreevy, Tim and Pollard, Michael James and Siebenaler, Chad W. and Swindeman, Robert W.},
abstractNote = {A CF8C type stainless steel alloy and articles formed therefrom containing about 18.0 weight percent to about 22.0 weight percent chromium and 11.0 weight percent to about 14.0 weight percent nickel; from about 0.05 weight percent to about 0.15 weight percent carbon; from about 2.0 weight percent to about 10.0 weight percent manganese; and from about 0.3 weight percent to about 1.5 weight percent niobium. The present alloys further include less than 0.15 weight percent sulfur which provides high temperature strength both in the matrix and at the grain boundaries without reducing ductility due to cracking along boundaries with continuous or nearly-continuous carbides. The disclosed alloys also have increased nitrogen solubility thereby enhancing strength at all temperatures because nitride precipitates or nitrogen porosity during casting are not observed. The solubility of nitrogen is dramatically enhanced by the presence of manganese, which also retains or improves the solubility of carbon thereby providing additional solid solution strengthening due to the presence of manganese and nitrogen, and combined carbon.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {8}
}

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Works referenced in this record:

Development of the 6.8L V10 Heat Resisting Cast-Steel Exhaust Manifold
conference, October 1996

  • Chen, Peter Y.; Lyons, Richard; Rakoczy, Michael
  • 1996 SAE International Truck and Bus Meeting and Exposition, SAE Technical Paper Series
  • https://doi.org/10.4271/962169