Why do some pots and pans have a copper bottom and Stainless steel inside? What type of SS are best suited for this application and why?
Copper bottom is for better conductivity of heat and SS inside due to better corrosion resistance. What is the function of a) Ni in maraging and austenitic stainless steel – Ni is an austenite stabilizer. Composition of maraging steel is so adjusted that austenite to martensite transformation proceeds even on air-cooling. Ni imparts air-hardening characteristics. b) Cr in stainless steel & high-speed steel – Cr gives corrosion resistance and wear-resistance to the steel. In high-speed steel Cr forms chromium-carbide that provides high red hardness and elevated temperature wear resistance. d) Mo in high speed steel and austenitic stainless steel – Mo forms Mo carbide which provides high red hardness and elevated temperature wear resistance in high speed steel. In austenitic stainless steel the molybdenum makes the steel more resistant to pitting and crevice corrosion in chloride-contaminated media, sea water and acetic acid vapours. e) Mn in hadfield steel and austenitic stainless steel
