Stainless steel. According to the query calculation network, stainless steel is more expensive than iron. By the end of 20231October 1 18, the price of stainless steel is above 50 yuan per kilogram, while the price of iron is per kilogram 10 yuan. Stainless steel is a corrosion-resistant alloy material, containing elements such as chromium and nickel, which can prevent oxidation and corrosion.