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).
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.