Type 441 (UNS S44100) is a ferritic stainless steel with a niobium (columbium) addition that has good oxidation and corrosion resistance, as well as good high-temperature strength. 441 is also the same as 18CrCb from AK Steel.
441 rolled coil stainless steel is used mainly for high-temperature settings and corrosive environments, particularly automotive-exhaust system components.
Specifications
ASTM A240 for annealed condition
ASTM A666 for tempered material*
ASTM A666 for tempered material*
| Composition per ASTM A240 | |
|---|---|
| Carbon | .030 Max |
| Manganese | 1.00 Max |
| Phosphorus | .040 Max |
| Sulfur | .030 Max |
| Silicon | 1.00 Max |
| Chromium | 17.50 - 19.50 |
| Nickel | 1.00 Max |
| Nitrogen | .030 Max |
| Titanium | 0.10 - 0.50 |
| Mechanical Properties (Annealed, Per ASTM A240) | |
| UTS | 65,000 ksi Min |
* Tempered mechanical properties are available upon request.
441 stainless steel applications include:
- Automotive: Exhaust manifold and other exhaust-system components, catalytic converter shells, clamps
Magnetic Properties: 441 flat rolled stainless steel is magnetic in all conditions.
Forming: Type 441 has good ductility and can be formed into most shapes.
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