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Product Overview
Stainless Steel 321 is a basic austenitic 18/8 steel (Grade 304) stabilized by Titanium additions. Grade 321 is used because it is 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. Grade 321H is a modification of 321 with a higher carbon content, to provide improved high-temperature strength. Steel Emporium offers these in various sizes and schedules to meet diverse industrial needs.
Key Advantages & Features
Intergranular Stability
Titanium stabilization prevents carbide precipitation during welding and high-heat service.
Oxidation Resistance
Excellent oxidation resistance at elevated temperatures up to 900°C.
High Creep Strength
321H variant provides superior long-term creep strength for high-pressure service.
| Grade | C | Mn | Si | Cr | Ni | Ti | P | S |
|---|---|---|---|---|---|---|---|---|
| SS 321 | 0.08 max | 2.0 | 0.75 | 17-19 | 9-12 | 5x(C+N) min | 0.045 | 0.030 |
| SS 321H | 0.04-0.10 | 2.0 | 0.75 | 17-19 | 9-12 | 4x(C+N) min | 0.045 | 0.030 |
| Property | Grade 321 | Grade 321H |
|---|---|---|
| Tensile Strength (MPa) min | 515 | 515 |
| Yield Strength 0.2% (MPa) min | 205 | 205 |
| Elongation (% in 50mm) min | 40% | 40% |
| Hardness (Rockwell B) max | 95 HRB | 95 HRB |
| Density (kg/m³) | 8000 | 8000 |
| Grade | UNS No | Werkstoff No. | JIS | BS |
|---|---|---|---|---|
| SS 321 | S32100 | 1.4541 | SUS 321 | 321S31 |
| SS 321H | S32109 | 1.4878 | SUS 321H | 321S51 |
Industrial Applications
Aerospace
Piston engine exhaust manifolds & stacks.
Refineries
Thermal oxidizers & refinery equipment.
Expansion Joints
Flexible bellows & high-temp seals.
Boiler Parts
Furnace components & heating elements.
Chemical Process
Welded equipment for chemical plants.
Exhaust Systems
Diesel & heavy-duty vehicle exhausts.