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

Patent ·
OSTI ID:1176042
; ; ; ;
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.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Caterpillar, Inc., Peoria, IL (United States)
Sponsoring Organization:
USDOE
Assignee:
Caterpillar Inc (Peoria, IL)
Patent Number(s):
7,153,373
Application Number:
10/195,724
OSTI ID:
1176042
Country of Publication:
United States
Language:
English

References (1)

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

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36 MATERIALS SCIENCE