Yorkshire and the Humber
Stainless steel was invented in 1913 by Harry Brearley of Sheffield, working for Firth Brown Steels (now called Sheffield Forgemasters). SAE 304 stainless steel is the most common stainless steel today, invented by Dr William Herbert Hatfield FRS in 1924 at Firth-Vickers known as Staybrite 18/8, a chromium-nickel steel. Many Swiss watches were mostly made out of Staybrite.
Stelio Belletti
Stelio Belletti is recognized to have been on the forefront of bicycle frame construction, always pushing the boundaries and experimenting with new solutions. He remembers being one of the first manufacturers to make stainless steel frames. 
Belletti continued to work in his family’s workshop until 1990 when the company closed. 
Over the following years, Belletti collaborated with other Italian brands producing TIG welded frames made with steel or aluminum tubing. 
Upon his retirement, Stelio Belletti has devoted his time to sports, participating in several cycling events, and even organizing some himself.