Alloy 20 Stainless Steel
UNS N08020
Description
Alloy 20 is an austenitic stainless steel containing less than 50% iron developed for applications involving sulfuric acid, phosphoric acid, nitric acid and chloride environments. Typically, Alloy 20 is ideal for use in environments prone to chloride stress cracking, pitting and crevice corrosion. Alloy 20 can be formed by hot or cold working. The hot forging material is heated to 2100 °F to 2250 °F, and the temperature is carefully controlled to ensure that the temperature does not fall below 1800 °F before forging. After hot working, the material is heated to 1725 °F to 1850 °F for annealing for 30 minutes per inch, and then water quenched.
Chemical Component
| C | Mn | Si | P | S | Ni | Cr | Mo | Cu | Cb + Ta | Fe |
|---|---|---|---|---|---|---|---|---|---|---|
| 0.07% max | 2.0% max | 1.00% max | 0.045% max | 0.035% max | 32.00-38.00% | 19.0-21.0% | 2.00-3.00% | 3.00-4.00% | 8*C-1.0% max | Balance max |
Basic Information
| Items | Alloy 20 Stainless Steel |
|---|---|
| Catalog | ACMA-Fe-A041 |
| Density | 8.08 g/cm3 |
| Modulus of Elasticity (E) | At 70 °F (20 °C): 28.0 x 103 ksi (193 GPa) |
| Modulus of Rigidity (G) | At 70 °F (20 °C): 11.0 x 103 ksi (76 GPa) |
| Coefficient of Expansion | 8.2 µin/in-°F (70-212 °F); 14.7 µm/m-°C (25-100 °C) |
| Electrical Resistivity | 53.5 µohm-in, (135.9 µohm-cm) |
| Thermal Conductivity | 85 Btu-in/ft2-hr-°F, 12.3 W/m-°C |
Material Forms
Alfa Chemistry offers Alloy 20 stainless steel in a variety of forms, including Wire, Bar, Strip, Foil.
Typical Mechanical Properties
- Alloy 20 stainless steel wire & bar
| Properties | Annealed | Spring Temper |
|---|---|---|
| Heat Treatment | 1800-2050 °F (982-1121 °C) | Stress Relieve 500 °F (260 °C) |
| Tensile Strength | 90-110 ksi (620-758 MPa) | 150 ksi min (1034 MPa) |
| Suggested Operating Conditions | Up to 930 °F (500 °C) | Up to 500 °F (260 °C) |
- Alloy 20 stainless steel strip & foil
| Properties | Annealed |
|---|---|
| Heat Treatment | 1650-1830 °F (900-1000 °C) |
| Tensile Strength | 80-110 ksi (550-760 MPa) |
| Suggested Operating Conditions | up to 930 °F (500 °C) |
Specifications
Wire & Bar: ASTM B473
Strip & Foil: ASTM A240, ASTM B463, NACE MR0175/ISO 15156, NACE MR0103
Applications
- Industries: Chemical processing, food processing, oil & gas.
- Specifically: Extraction columns, heat exchangers, mixing tanks, pipes, pumps, valves, food processing equipment, springs.
* 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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