The stainless steel was invented in the year 1900-1915. Berthier who was a Frenchman found that the iron can be combined with chromium and is resistant to several acids. Other people studied the properties of chromium in an iron template and used a low proportion of chromium. About 10.5 percent chromium substance is used in order to make stainless steel.
Harry Brearley considered as a leader of the research department who runs a lab along with Thomas Firth and Sons and John Brown And Company and is usually recognized as the inventor of the manufacturing period of stainless steel. Most of his work was on 430 (the chemical analysis was patented in 1919). The first product was table cutlery and it is still used today.