Harry Brearley
Harry Brearley (18 February 1871 – 14 July 1948) was an English metallurgist, usually credited with the invention of "rustless steel" (later to be called "stainless steel" in the anglophone world).
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.