Type 441 (UNS S44100) is a ferritic rolled coil stainless steel with a niobium (columbium) addition that has good oxidation and corrosion resistance, as well as good high-temperature strength. 441 is similar to AK Steel 18 Cr-Cb™.
441 rolled coil stainless steel is used mainly for high-temperature settings and corrosive environments, particularly automotive-exhaust system components.
441 Stainless Steal Specifications:
ASTM A240 for annealed condition
ASTM A666 for tempered material*
441 Stainless Steel Applications:
Automotive
Exhaust manifold and other exhaust-system components, Catalytic converter shells, Clamps
| Composition per ASTM A240 | |
| Carbon | .030 Max |
| Manganese | 1.00 Max |
| Phosphorus | .04 Max |
| Sulfur | .03 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 |
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.
