446 Stainless Steel
UNS S44600
Description
The grade 446 stainless steel is a ferritic, non-heat treatable stainless steel that provides good resistance to high temperature oxidation and corrosion. 446 stainless steel is the only heat resistant alloy that can tolerate molten red copper and brass. This grade is most commonly used between 1500-2100 °F, although its elevated temperature strength is quite low. Compared with other high chromium ferrite stainless steels, 446 becomes brittle (embrittlement at 885 °F) in the 700-1000 °F, and thus it should not be used at these temperatures.
Chemical Component
| Cr | Si | C | Mn | S | N | P | Fe |
|---|---|---|---|---|---|---|---|
| 23.0-27.0% | 1.0% max | 0.15% max | 1.5% max | 0.03% max | 0.25% max | 0.04% max | Balance |
Basic Information
| Items | 446 Stainless Steel |
|---|---|
| Catalog | ACMA-Fe-A027 |
| Density | 0.270 lb/in3 |
| Melting Range | 2640-2710 °F |
| Coefficient of Thermal Expansion, in/in°F x 10-6 | 70-1200 °F: 6.3; 70-1400 °F: 6.4; 70-1600 °F: 6.7; 70-1800 °F: 7.3 |
| Thermal Conductivity, Btu·ft/ft2·hr·°F | At 70 °F: 13.2; At 1200 °F: 18.8; At 1400 °F: 19.9; At 1600 °F: 20.8; At 1800 °F: 21.6 |
| Modulus of Elasticity Dynamic, psi x 106 | At 70 °F: 30.4; At 1200 °F: 20.0 |
Material Forms
Alfa Chemistry offers 446 stainless steel in a variety of forms, including Flat Bar, Round Bar, Square Bar.
Mechanical Properties
- Representative tensile properties
| Temperature, °F | 70 | 1000 | 1100 | 1200 | 1300 | 1400 |
| Ultimate Tensile Strength, ksi | 68 | 52.7 | 27.7 | 15.0 | 10.5 | 5.0 |
| 0.2% Yield Strength, ksi | 50 | 42.3 | 23 | 12 | 9.0 | 4.0 |
| Elongation, % | 30 | 27 | 65 | 90 | 113 | 128 |
| Hardness, Brinell | 83-93 | - | - | - | - | - |
- Typical creep- rupture properties
| Temperature, °F | 1400 | 1600 | 1800 |
| Minimum Creep 0.0001%/Hour, ksi | 0.26 | - | - |
| 10,000 Hour Rupture Strength, ksi | 1.1 | 0.45 | 0.23 |
Specifications
Features
- Oxidation resistance through 2000 °F
- Sulfidation resistance
- Good thermal conductivity
- Resistance to molten copper
- Low strength
Applications
- Neutral salt pot electrodes
- Recuperators
- Spouts for conveying molten copper alloys
- Oil burner parts
- Combustion chambers
- Furnace and kiln linings
- Stack dampers
- Boiler baffles
- Glass molds
- Soot blowers
* 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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