Stainless acid-resistant steel is stainless steel, it is composed of stainless steel and acid-resistant steel two major parts, in short, can resist atmospheric corrosion of steel called stainless steel, and can resist chemical corrosion of steel called acid-resistant steel. Spring Steel is a good carbon steel, but it rusts. Dip in salt water on two kinds of steel can see a day handle rust is a way (304 stainless steel can, 201 stainless steel will rust, less just) ; Another method is to put the two kinds of steel in the diluted oxalic acid, sulfuric acid can be seen in the large reaction is the spring steel, no reaction or small reaction is stainless steel.