Waseca, Minnesota souvenir. Found in estate of Helen Johnson Haug of New Richland, Minnesota. Stainless steel was invented in 1912. The first authentic stainless steel was melted on 13th August 1913 containing 0.24% carbon and 12.8% chromium. By the late 1920's, two additional kinds of stainless steel were found: the martensitic stainless with 13% to 18% chromium content and austenitic stainless steel that contained 18% chromium and 8% nickel. Over the years, 10.5% chromium came to be regarded as stainless steel distinguished from other metals as it creates a protective film of chromium oxide that renews itself thus preventing any form of rusting.
