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.
Elwood Haynes
Haynes continued his research into ways to produce corrosion resistant metals. While working on alloys for use in spark plugs, he created a metal he named stellite. Realizing the value of his discovery, he patented his first version in 1907. The metal was very resistant to corrosion and had immediate application in tool making and numerous other implementations. He continued to experiment with it until 1910 when he published his findings in a paper to the International Congress of Applied Chemistry and the American Institute of Metals, where he held memberships. His final version was completed in 1912 and his patent issued on June 20.