Stainless Steel 446
Material Data Sheet
446 is a ferritic stainless steel alloy melted as AOD. This alloy is non-hardenable but has excellent corrosion resistance at very higher temperatures and possesses good mechanical properties. This grade has poor ductility due to the high chromium content (roughly 25wt%). Because of the excellent oxidation resistance at high temperatures this grade is widely used as furnace parts and boiler baffles.
Chemical Composition
| Element | Content (%) |
|---|---|
| Iron, Fe | 73.0 |
| Chromium, Cr | 23.0 – 27.0 |
| Manganese, Mn | ≤ 1.50 |
| Silicon, S | ≤ 1.0 |
| Nickel, Ni | ≤ 0.25 |
| Carbon, C | ≤ 0.20 |
| Phosphorus, P | ≤ 0.04 |
| Sulfur, S | ≤ 0.03 |
Physical Properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.80 g/cc³ | 0.282 lb/in³ |
| Melting Point | 1425 – 1510 °C | 2597 – 2750 °F |
Mechanical Properties
| Property | Metric | Imperial |
|---|---|---|
| Hardness, Brinell | 185 | 185 |
| Hardness, Knoop | 201 | 201 |
| Hardness, Rockwell A | 55.2 | 55.2 |
| Hardness, Rockwell B | 90 | 90 |
| Hardness,Vickers | 185 | 185 |
| Tensile Strength, Ultimate | 585 MPa | 84800 psi |
| Tensile Strength, Yield | 485 MPa | 70300 psi |
| Elongation at Break | 20% | 20% |
| Reduction of Area | 45% | 45% |
| Modulus of Elasticity | 200 GPa | 29000 ksi |
Applications
Stainless Steel 446 is used in the following application areas:
- 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
