USA Piping Solution is a Ferritic SS 441 pipes and tubes supplier in the USA, stocking UNS S44100 material to ASTM A268 for the application this grade is built around: automotive exhaust systems. Manifolds, catalytic converter housings, and exhaust piping are the classic use for 441, because its titanium and niobium dual stabilization gives it corrosion resistance close to 304 in exhaust gas environments, at a lower cost and with better high-temperature strength than 409. Every heat ships with full mill certification and traceability. For the higher-molybdenum grade built for heat exchangers, see our Ferritic SS 444 Pipes & Tubes, and for the extreme high-temperature grade, see Ferritic SS 446 Pipes & Tubes.
Specification
| Specification | Details |
|---|---|
| Standard | ASTM A268 / ASME SA268 (seamless and welded ferritic stainless tubing, general service) |
| UNS | S44100 |
| EN / Werkstoff Nr. | 1.4509 |
| Type | Ferritic, dual-stabilized with titanium and niobium |
| Form | Seamless and welded tube; pipe on request |
| Defining use | Automotive exhaust systems, manifolds, catalytic converter housings |
For the broader stainless steel range, see our Stainless Steel Pipes & Tubes category, or compare against the lower-cost ferritic grade on our Stainless Steel 409 Pipes & Tubes page.
Why 441 for Exhaust Systems
Exhaust gas environments cycle through wide temperature swings and carry condensation, which is exactly where an unstabilized ferritic grade fails: chromium carbides form at grain boundaries during welding or extended heat exposure, and the depleted zone corrodes. Titanium and niobium in 441 intercept carbon and nitrogen before that happens, which is why 441 holds up in as-welded exhaust components where 409 alone would need more conservative design margins.
The tradeoff is cost: 441 is a step up from 409, and buyers who don't need the extra margin often stay with 409. For a manifold or catalytic converter housing running hot and cycling often, the extra stabilization is usually worth it.
Applications
- Automotive Exhaust Systems: manifolds, catalytic converter housings, exhaust piping, the grade's primary use.
- Heat Exchangers: tube where moderate corrosion resistance and good formability are needed.
- Solar Water Heater Components: collector and tank parts exposed to heat cycling.
For automotive-specific tube profiles and sizing, see our Automotive Steel Tubes page.
Have a Drawing for an Exhaust Component? Send It Over
Testing & Availability
Every heat is tested and mill certified to ASTM A268; see our Quality Policy page for the full testing program we run across all grades. Send us your OD, wall thickness, and length requirement and we'll confirm current mill availability and lead time.
Related Products
- Ferritic SS 444 Pipes & Tubes
- Ferritic SS 446 Pipes & Tubes
- Stainless Steel 409 Pipes & Tubes
- Automotive Steel Tubes
- Stainless Steel Pipes & Tubes
Frequently Asked Questions
How does SS 441 compare to SS 409 for exhaust systems?
441 outperforms 409 in both high-temperature strength and oxidation resistance, and its dual stabilization holds up better in the as-welded condition. 409 remains the lower-cost option where the service is less demanding; 441 earns its premium in hotter, more cyclic exhaust applications.
Is SS 441 magnetic?
Yes, 441 is ferritic and magnetic in all conditions, including after welding and heat treatment.
What sizes are available in SS 441 tube?
Send us your OD, wall thickness, and length requirement and we'll confirm current mill availability and lead time.