Ti as the stable elements exist in 321 stainless steel,it is also heat resistant steel,better than in the high temperature than 316L,321 stainless steel in different temperature and different concentration of organic acid and inorganic acid, especially has good wear and corrosion resistance in oxidizing medium for the manufacture of the wear resistant acid containers and equipment lining, pipeline.

321 stainless steel is base on Cr-Ni-Ti Austenitic stainless steel,and it ie similar with 304 stainless steel, but better resistance to intergranular corrosion resistance due to the addition of titanium element,and high temperature strength. Due to the addition of titanium, it is effective to control the formation of chromium carbide.

321 stainless steel has excellent high temperature stress rupture properties and high temperature creep properties,its mechanical properties are better than 304 stainless steel.

321 stainless steel chemical composition(%)

C Si Mn P S Cr Ni Ti N
321 0.08 1.00 2.00 0.045 0.030 17.0/19.0 9.0/12.0 5 x C min – 0.70 max 0.10

321 stainless steel grade mechanical property

Tensile strength(Mpa) Yield point(Mpa) Elongation(%) Hardness(HRB)
321 520 205 40 90

321 stainless steel Physical Properties

Density( g/cm3 ) 20 ℃8.03
Melting Point(℃)1398~1427
Specific heat capacity  [kJ/(kg·K)]   0~100 ℃0.50
Thermal conductivity  [W/(m·K)]100 ℃16.3
500 ℃22.2
Coefficient of Expansion( 10-6/K )0~100 ℃16.6
0~500 ℃18.6
Resistivity( Ω·mm2/m ) 20 ℃0.72
Longitudinal elastic modulus( kN/mm2 ) 20 ℃193
magnetica little after cold worked

321 Equivalent Grades

  • UNS S 32100
  • EN 04Cr18Ni10Ti20
  • DIN 1.4541
  • JIS SUS321
  • China GB 06Cr18Ni11Ti

321 application

Titanium added 321 to make it more suitable for high temperature applications, for 304 sensitization and 304L high temperature strength of the lack of application environment. Typical applications include thermal expansion joints, bellows, aircraft exhaust system components, heating element jacket tubes, furnace components and heat exchangers.