A stainless steel trademark or brand name which applies to a variety of stainless steels that are produced by Krupp Thyssen Nirosta GmbH (KTN), which is headquartered in Krefeld, Germany. Since stainless steel is actually steel alloyed with chrome and nickel, the exact percentages of these ingredients are what is trademarked. The Nirosta trademark was registered in 1922 in Germany by Krupp. KTN is a part of the company Krupp Thyssen Stainless, which is in turn part of Thyssen Krupp Steel (under the Krupp Group). KTN is one of the world's leading producers of stainless steel. [This information contributed by David Semak, Clayton, CA.]