Stainless Steel 321 is a basic austenitic 18/8 steel (Grade 304) stabilised by Titanium (321) addition. SS 321 is used because they are not sensitive to intergranular corrosion after heating within the carbide precipitation range of 425-850°C. SS 321 is the grade of choice for applications in the temperature range of up to about 900°C, combining high strength, resistance to scaling and phase stability with resistance to subsequent aqueous corrosion.
The key feature of 321 stainless is its resistance to intergranular corrosion. It employs titanium as a stabilizing element against chromium carbide formation. This alloy also exhibits strength characteristics superior to those of 304 stainless.
Chemical Composition %
| C | Mn | P | S | Si | Ni | Cr | Mo | Ti | N | Nb |
321 | 0.080 | 2.00 | 0.045 | 0.030 | 1.0 | 9-12 | 17-19 |
| 0.7>5XC |
|
|
321H | 0.04-0.10 | 2.00 | 0.045 | 0.030 | 1.0 | 9-12 | 17-19 |
| 0.7>5XC |
|
|
1.4541 | 0.080 | 2.00 | 0.040 | 0.015 | 1.0 | 9-12 | 17-19 |
| 0.7>5XC |
|
|
Mechanical propertoes
| Tensile strength(Mpa) | Yield point(Mpa) | Elongation(%) Longitudinal | Elongation(%) transverse |
321 | 515 | 205 | 35 | 30 |
321H | 515 | 205 | 35 | 30 |
1.4541 | 500-700 | 200 | 35 | 30 |