岡崎市
, born on February 23, 1870 in Okazaki, Aichi Prefecture – February 12, 1954) was a Japanese scientist and inventor. He invented KS steel (initials from Kichiei Sumitomo), which is a type of magnetic resistant steel that is three times more resistant than tungsten steel. This material, which had 250 oersteds magnetic resistance, was developed through rigorous basic research on steel and alloys.