What's the difference between stainless steel 304 and stainless steel 202?
202 stainless steel is one of the 200 series stainless steel, the national standard model is 1Cr18Mn8Ni5N. 200 series stainless steel is low nickel, high manganese stainless steel, nickel content, manganese content of about 8%, is a nickel type stainless steel.
304 stainless steel is a common stainless steel material, the density of 7.93 g/cm3, the industry is also called 18/8 stainless steel. High temperature resistance of 800 degrees, with good processability, high toughness characteristics, widely used in industry and furniture decoration industry and food and medical industry. The common marking methods in the field are 0Cr18Ni9, SUS304.
Different chemical composition. 304 of the nickel is much higher than 202.
After pickling of stainless steel, surface color silver finish: chromium nickel stainless steel color white jade is white; chromium stainless steel slightly weak light Ze; CrMnN Stainless steel and chromium nickel stainless steel similar color is slightly lighter. The surface color: stainless steel pickling chrome nickel steel is brownish black brown and white; chromium; chromium manganese nitrogen is black, (these three kinds of color, refers to the oxidation of the heavier color). Cold rolled unannealed chromium nickel stainless steel, silver reflective surface. Stainless steel, except for steel, is usually pickled and white.
Is the steel of the oxide layer was removed, put a drop of water, rub rub after copper sulfate, such as discoloration, usually stainless steel; such as purple red: nonmagnetic as high manganese steel, magnetic for ordinary steel or low-alloy steel.
