Stainless 321 is a heat resistant, titanium stabilized, austenitic alloy that's commonly used for service in the 1000°-1600°F temperature range. 321 stainless is primarily used in applications that involve continuous and intermittent service temperatures within the carbide precipitation range of 800°-1500°F. Type 321 is similar to type 304 stainless but with a titanium addition of at least five times the carbon content. This titanium addition reduces or prevents carbide precipitation during welding and in the 800°-1500°F service conditions. In order to provide optimum resistance to intergranular corrosion and to polythionic acid stress corrosion cracking in service temperatures at 1500°-1650°F an air cool may be used.
In what form is Stainless Steel 321 available at Ramdev Steel Engineering?
Chemistry Composition,%
- Bar
- Wire
- Sheet
- Plate
- Forgings
- Pipe
- Flanges
Mechanical Properties
Chemistry Composition,%
| Ni | Cr | Mo | Mn | Si |
|---|---|---|---|---|
| 11.0 - 15.0 | 18.0 - 20.0 | 3.0 - 4.0 | 2.0 Max | .75 Max |
| C | N | S | P | Fe |
| 0.03 Max | 0.1 Max | 0.03 Max | 0.045 Max | Balance |
What are the characteristics of 321 Stainless?
- Oxidation resistant to 1600°F
- Stabilized against weld heat affected zone (HAZ) intergranular corrosion
- Resists polythionic acid stress corrosion cracking
What applications might 321 Stainless Steel be used?
- Aircraft piston engine manifolds and exhaust stacks
- Expansion joints
- Thermal oxidizers
- Refinery equipment
- High temperature chemical process equipment
Mechanical Properties
Average Elevated Temperature Tensile Properties
| Temperature, °F | Ultimate Tensile Strength, ksi | .2% Yield Strength, ksi |
|---|---|---|
| 68 | 84 | 38 |
| 400 | 62 | 20.5 |
| 600 | 62 | 18 |
| 800 | 62 | 17 |
| 1000 | 59.5 | 16.5 |
| 1200 | 45.5 | 16 |
| 1400 | 27.5 | 14 |
Welding Stainless Steel 321
321 Stainless is readily welded by all common methods including submerged arc. Appropriate weld fillers are most often specified as AWS E/ER 347 or E/ER 321.