What is the difference between 304 and 202 stainless steel water pipes

Chemical composition is different. The nickel content of 304 is much higher than that of 202. 304 stainless steel is a common material in stainless steel, with a density of 7.93 g / cm3, also known as 18 / 8 stainless steel in the industry. High temperature resistance 800 degrees, with good performance, high toughness characteristics, widely used in industry and furniture decoration industry and food therapy industry.

0Cr18Ni9 and SUS304 are the common marking methods on the field 202 stainless steel is one of 200 series stainless steel, the national standard model is 1Cr18Mn8Ni5N. 200 series stainless steel belongs to low nickel and high manganese stainless steel, with nickel content and manganese content of about 8%, which is nickel saving stainless steel.

Distinguishing method: according to the color difference: the washed stainless steel has a silver white and bright surface color; the chrome nickel stainless steel has a silver white and jade color; the chrome stainless steel has a white color and a little gray light; the chrome manganese nitrogen stainless steel has a similar color and a little light color with the chrome nickel stainless steel. The surface color of unwashed stainless steel: chrome nickel steel is brownish white; chrome steel is brownish black; chrome manganese nitrogen is black (these three colors refer to the color with heavy oxidation). Cold rolled non annealed chromium nickel stainless steel, with silver white surface and reflective.

Stainless steel, except yuan steel, is generally white after washing.