309 Stainless Steel
UNS S30908
Description
309 stainless steel is austenitic chromium-nickel stainless steels that is often used for higher temperature applications. Due to its high chromium and nickel content, 309 stainless steel is highly corrosion resistant, has outstanding resistance to oxidation, and excellent heat resistance while providing good strength at room and elevated temperatures. The alloy possesses high tensile and creep strength at elevated temperatures. Strength at elevated temperatures is similar to that of 18-8 stainless steels. It is more resistant to marine atmospheres than alloy 304.
Chemical Component
| Ni | Cr | Mn | C | S | P | Fe |
|---|---|---|---|---|---|---|
| 12.0-15.0% | 22.0-24.0% | 2.0% max | 0.08% max | 0.03% max | 0.045% max | Balance |
Basic Information
| Items | 309 Stainless Steel |
|---|---|
| Catalog | ACMA-Fe-A010 |
| Density | 0.285 lb/in3 |
| Melting Range | 2500-2590 °F |
| Coefficient of Thermal Expansion, in/in°F x 10-6 | 70-1000 °F: 9.7; 70-1600 °F: 10.1 |
| Thermal Conductivity, Btu·ft/ft2·hr·°F | At 70 °F: 7.4; At 1000 °F: 11.5; At 1200 °F: 12.4 |
| Modulus of Elasticity Dynamic, psi x 106 | At 70 °F: 28.5; At 1000 °F: 22.5; At 1200 °F: 21.0; At 1400 °F: 19.5; At 1600 °F: 18.0 |
Material Forms
Alfa Chemistry offers 309 stainless steel in a variety of forms, including Pipe, Plate, Rod Coil, Round Bar, Sheet, Wire.
Mechanical Properties
- Representative tensile properties
| Temperature, °F | 70 | 1200 | 1600 |
| Ultimate Tensile Strength, ksi | 90 | 52 | 18 |
| 0.2% Yield Strength, ksi | 45 | 22 | - |
| Elongation % | 50 | 26 | 32 |
- Typical creep-rupture properties
| Temperature, °F | 1200 | 1400 | 1600 | 1800 |
| Minimum Creep 0.0001%/Hr, ksi | 16 | 3.4 | 1.4 | 0.22 |
| 10,000 Hour Rupture Strength, ksi | 17.2 | 4.8 | 1.6 | 0.56 |
Specifications
Features
- Oxidation resistant to 1900 °F
- Moderate strength at high temperature
- Ease of fabrication
- Good sulfidation resistance
- Good weldability
Applications
- Annealing covers and boxes
- Carbon saggers
- Waste incinerators
- Pulverized coal burners
- Brazing fixtures
- Lead pans, neutral salt pots
- Muffles, retorts
- Anchor bolts
- Furnace fans and shafts
- Radiant tubes for aluminum and steel annealing
- Glass forming equipment
- Thermowells
- Paper mill equipment
- Power boiler tube hangers
- Rotary kilns and calciners
* Technical data included herein should be used as a guideline only, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice.
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Alfa Chemistry is a manufacturer of standard & custom specialty metals & alloys. We stock a wide variety of alloys in different shapes and specifications. If you can't find the product or specification you need, please contact us directly.
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