Stainless steel is an alloy of iron-chromium-carbon with a minimum of 10.5% chromium content by weight Chromium creates a tiny layer (10-100 nm) of chromium trioxide (Cr2O3), which protects the metal substrate from oxidation and corrosion. In addition to chromium, stainless steel may contain other alloying elements such as nickel, molybdenum, manganese, etc. Stainless steel produced in electric furnaces with remelting scrap (scrap), ferroalloys (eg ferrochrome, ferronickel, etc.) and other metallic additions. They are widely used in many applications requiring corrosion resistance for economic reasons (eg chemical industry), for aesthetic reasons (eg architecture) or for health reasons (eg, utensils). Compared to common steel, stainless steel, in addition to much higher corrosion resistance, has further and higher mechanical strength. However, it is harder than common steel and therefore more unprocessable. Stainless steels also have low thermal conductivity compared to ordinary steels.