Allegheny Ludlum AL 304DA is tri-ply composite consisting 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 AL 304 stainless steel along with the good heat transfer characteristics of carbon steel. 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 stainless/carbon steel interface.

The major use of Al 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. AL 304DA may also be used as induction heating cookware.

Information provided by Allegheny Ludlum Corporation.