A, different properties
1, 321 stainless steel: Ni-Cr-Ti type austenitic stainless steel. 321 stainless steel is Ni-Cr-Ti type austenitic stainless steel, its performance is very similar to the 304, but due to the addition of the metal titanium, so that it has a better resistance to corrosion at the grain boundary and high temperature strength. Due to the addition of the metal titanium, so that it effectively controls the formation of chromium carbide.
2, 304 stainless steel: a common material in stainless steel, density of 7.93g/cm3, the market common labeling method of 06Cr19Ni10, SUS304.
Second, the characteristics of the different
1, 321 stainless steel: wear resistance, high temperature, creep resistance, etc. 321 stainless steel in which the Ti As a stabilizing element exists, but it is also a hot strong steel, in high temperature than 316L is much better than 321 stainless steel in different concentrations, different temperatures of organic and inorganic acids.
2, 304 stainless steel: 304 in the most important elements are Ni, Cr, but not limited to these two elements. Specific requirements specified by the product standard. Industry common judgment that as long as the Ni content is greater than 8%, Cr content is greater than 18%, can be considered as 304 stainless steel.
Three, different uses
1, 321 stainless steel: used in the manufacture of wear-resistant acid containers and wear-resistant equipment lining, piping. Apply to the chemical, coal, petroleum industry with high resistance to crystalline corrosion requirements of the field open-air machines, building materials and heat-resistant parts and heat treatment of parts with difficulties.
2, 304 stainless steel: widely used in industrial and furniture decoration industry and food medical industry.
Baidu Encyclopedia-321 Stainless Steel
Baidu Encyclopedia-304 Stainless Steel