Stainless steel 321 is a standard austenitic 18/8 chromium nickel alloy with the addition of Titanium, the titanium stabilises the material removing its susceptibility to the effects of intergranular corrosion.
SS 321 is therefore the stainless steel material of choice for applications in working environments up to 900° C.
Chemical Composition of Stainless steel 321
| UNS No |
S32100 |
| EN |
1.4541 |
| AISI |
321 |
| Carbon (C) |
0.08 |
| Silicon (Si) |
0.75 |
| Manganese (Mn) |
2.00 |
| Phosphorus (P) |
0.045 |
| Sulphur (S) |
0.030 |
| Chromium (Cr) |
17.00 – 19.00 |
| Nickel (Ni) |
9.00 – 12.00 |
| Other |
Ti:5x(C+N)/0.70 |
Mechanical Properties of Type 321 Stainless steel
| Proof Stress 0.2% (MPa) |
205 |
| Tensile strength (MPa) |
515 |
| Elongation A5 (%) |
40 |
| Hardness |
HB: 217
HRB: 95 |
Stainless steel 321 Physical Properties
| Grade |
Density (kg/m3) |
Elastic Modulus (GPa) |
Mean Coefficient of Thermal Expansion (μm/m/°C) |
Thermal Conductivity (W/m.K) |
Specific Heat 0-100 °C (J/kg.K) |
Electrical Resistivity (nΩ.m) |
| 0-100 °C |
0-315 °C |
0-538 °C |
at 100 °C |
at 500 °C |
| 321 |
8027 |
193 |
16.6 |
17.2 |
18.6 |
16.1 |
22.2 |
500 |
720 |
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