Grade 321 stainless steel (1.4541) is a heat resistant grade supplied into numerous industry sectors. The key property of this grade is the added titanium content (5 x C%) stabilising the material and making its resistance to carbide precipitation when exposed to high temperatures and resistance to oxidation its main characteristics. Whilst retaining good strength and corrosion resistance when exposed to high temperatures, this grade of stainless steel like most austenitic grades will also maintain its strength and toughness at sub-zero temperatures, making this an excellent choice for various applications ranging from oil refinery equipment to automotive exhaust systems.
Applications
- Exhaust Systems
- Manifolds
- Chemical Plant
- Heat Exchangers
- Piping
- Furnace Parts
- Storage Tanks
- Pressure vessels
- Industrial boilers
Chemical composition
| 321 | Cr% | Ni% | Mo% | Ti% | C% | Cu% | Mn% | Si% | N% |
| MIN | 17.0 | 9.0 | – | (5xC+N) | – | – | – | 0.25 | – |
| MAX | 19.0 | 12.0 | 0.75 | 0.7 | 0.08 | 0.75 | 2.0 | 1.0 | 0.1 |
Mechanical properties (at room temperature in annealed condition)
| Product Form | Max Thickness (mm) | Yield Strength | Tensile Strength | Elongation min. in % | Impact Energy (ISO-V) ≥ 10mm thick | |||
|---|---|---|---|---|---|---|---|---|
| 0.2% Rp0.2 N/mm2 | 1% Rp1.0 N/mm2 | Rm N/mm2 | A1) %min (longitudinal) | A1) %min (transverse) | Jmin (longitudinal) | Jmin (transverse) | ||
| C | 8 | 2203) | 2203) | 520-7203) | – | 40 | – | – |
| H | 13.5 | 2003) | 2403) | 520-7203) | – | 40 | 100 | 60 |
| P | 75 | 2003) | 2403) | 500-7003) | – | 40 | 100 | 60 |
| L | 160 | 1904) | 2254) | 500-7004) | 40 | – | 100 | – |
| L | 2502) | 1907) | 2257) | 500-7007) | – | 30 | – | 60 |
| TW | 60 | 1805) | 2155) | 460-6805) | 35 | 30 | 100 | 60 |
| TS | 60 | 1805) | 2155) | 460-6805) | 35 | 30 | 100 | 60 |
Partial part type display:
