Stainless steel / UNS S44100
441 is an 18% chromium ferritic stainless steel dual-stabilised with titanium and niobium, giving good weldability and thermal-fatigue resistance for hot exhaust components.
- UNS S44100
- W.Nr. 1.4509
- Spec ASTM A240
- Density 7.7 g/cm³
Also known as / equivalents
| System | Designation |
|---|---|
| UNS | S44100 |
| W.Nr. | 1.4509 |
| EN | X2CrTiNb18 |
| Also known as | AISI 441, 1.4509 |
Chemical composition
| Element | Min % | Max % |
|---|---|---|
| C | — | 0.030 |
| Mn | — | 1.00 |
| P | — | 0.040 |
| S | — | 0.030 |
| Si | — | 1.00 |
| Cr | 17.5 | 18.5 |
| Ni | — | 1.00 |
| N | — | 0.030 |
| Ti | 0.10 | 0.60 |
| Nb | 9×C+0.30 | 1.00 |
| Fe | Bal. | — |
Physical properties
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.7 g/cm³ | 0.278 lb/in³ |
| Magnetic response | Magnetic | — |
Available forms & specifications
| Form | Specification | Size range |
|---|---|---|
| Sheets, plates & coils | ASTM A240 / ASME SA240 | 0.3 mm – 6 mm |
| Seamless & welded pipe | ASTM A312 / ASME SA312 | 1/8" – 24" NB |
| Tubes | ASTM A213, A249, A269 | 1/8" – 24" NB |
| Bars & rods | ASTM A276, A479 | 3 mm – 500 mm |
| Flanges & forgings | ASTM A182 / ASME SA182 | 1/2" – 48" NB (larger on request) |
| Buttweld fittings | ASTM A403 / ASME SA403 | 1/2" – 48" NB |
| Fasteners | ASTM A193 / A194, F593 / F594 | M3 – M56 |
Corrosion & temperature resistance
Corrosion resistance rises with chromium, molybdenum and nitrogen: 304 handles general atmospheric and food-contact service, 316/317 add resistance to chlorides and pitting, 904L handles strong reducing acids, and stabilised 321/347 resist intergranular attack after welding or high-temperature exposure.
Applications
SS 441: Exhaust manifolds, catalytic converters. Process piping, tanks and vessels, heat exchangers, food, dairy and pharmaceutical equipment, architectural work and general engineering.
Frequently asked questions
What is the UNS number of SS 441?
SS 441 is designated UNS S44100 (W.Nr. 1.4509, EN X2CrTiNb18).
What is SS 441 used for?
Dual-stabilised ferritic. Typical uses: exhaust manifolds, catalytic converters.
Is SS 441 magnetic?
Magnetic.
In which forms can I buy SS 441 from Rajkamal Metals?
Coils & Strips, Sheets & Plates, Pipes & Tubes, Round Bars & Rods, Structural Sections, Flanges, Buttweld Fittings, Socket Weld & Threaded Fittings, Fasteners, Ferrule / Instrumentation Fittings, Dairy Fittings, Dish Ends, SS Tanks, Custom Orders. Sizes as per standard; other sizes on request.
Do you supply a Mill Test Certificate with SS 441?
Yes. Actual values are given in the Mill Test Certificate (EN 10204 3.1) supplied with each order.
Last updated: 30 October 2026. Grade names identify the supply range; designations are not engineering equivalents. Availability, make, origin and documentation are confirmed at quotation.
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