ATI 304DA tri-ply composite consists of a dual stabilized, low carbon steel center "sandwiched" between Type 304 stainless steel. The top and bottom stainless steel surfaces (cladding), each representing approximately 20% of the product thickness, are bonded to the carbon steel core during hot rolling, thereby providing a metallurgical bond which remains sound during subsequent cold forming operations. This composite product provides the excellent corrosion resistance of ATI 304 stainless steel along with the good heat transfer characteristics of carbon steel. Allegheny Ludlum developed this proprietary composite which is covered by U.S. Patent Nos. 5,370,946 and 5,529,644. This patented material has excellent cold forming properties. Carbon from the core does not migrate into the stainless steel cladding during hot processing, and thereby enhances formability by eliminating the possibility of "hook cracks" caused by carbide precipitation at the stain-less/carbon steel interface.

APPLICATIONS
The major use for ATI 304DA material is in conventional cookware because of its corrosion resistance, safety in food contact, attractive appearance, ease of cleaning, oxidation resistance, ease of fabrication, good heat distribution characteristics, and durability. ATI 304DA may also be used as induction heating cookware. Other applications for ATI 304DA material might include the chemical or food processing industries where Type 304 is used.