CF8C-Plus cast austenitic steels

  Phil Maziasz with CF8C-Plus cast austenitic stainless steel
  Burner housing made of CF8C-Plus steel and designed for the pyrolytic breakdown of carbon
particulates trapped in ceramic particulate filters downstream of the burner in a Caterpillar
Regeneration System.

CF8C-Plus cast austenitic steels are low-cost, high-performance alternatives to conventional cast steels. They may also become a more universal grade that replaces the wide range of similar more expensive custom or specialty steels. For diesel exhaust systems, the current 400 tons of CF8C-Plus steel used by Caterpillar to make the regeneration system burner housing for diesel particular filters has a direct materials value of over $5 million, but prevents the use of nickel-based superalloys that would cost $28 million for the same application, so the benefit is a savings of about $23 million. The CF8C+ steel exhaust components require no heat-treatments after casting, so there is another $5 million cost savings relative to cast-irons, steels or alloys that require heat-treating.

This alloy was jointly developed by ORNL and Caterpillar. New Cu- and W-modified versions of CF8C-Plus have high-temperature strength properties rivaling more costly Ni-base alloys.

New Steel Advances Engine Exhaust System Design [pdf]


For a poster on this R&D Award-winning technology (PDF 3.2 MB)

For a Press Release on this 2003 R&D 100 Award-winning technology




Contact: Bruce Pint,, (865) 576-2897


EERE Vehicle Technologies Program Commercialization Success
For an article on New Steel Advances Engine Exhaust System Design [PDF 1.2 MB]


For Technical data about CF8Cplus steels see the ASM Alloy Digest, Jan 2008 article [PDF 2 MB]


 Oak Ridge National Laboratory