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.
KS Steel
After World War one when Japan faced a problem which is in coping with painful restrictions on imports of materials from foreign countries such as Germany that is when Physicist Kotaro Honda, he was motivated in his study of alloys for this need in domestic steel production and opened up his RIKEN-Honda Laboratory at Tohoku Imperial University in 1922. He invented KS steel in 1917 it is a permanent magnetic steel with three times the magnetic resistance of tungsten steel. Kichizaemon Sumitomo, who was the head of the family run that provided provided financial support for the research leading to the invention, gives the initials KS in the name of the steel.