441
GRADE
Grade 441 (UNS S44100, EN 1.4509) is dual-stabilized Ferritic stainless steel with 18% chromium, low-carbon. This grade exhibits good high temperature strength, exceeding that of grade 409L and 439 plus good corrosion resistance in many exhaust gas environments and good oxidation resistance at elevated temperatures.
Ferritic steels are not inherently strong at elevated temperatures, but columbium additions coupled with appropriate solution annealing markedly improve long-time creep rupture strength, and this makes it suitable for using in application in tube and automotive industries.
Grade 441 is dual stabilized with niobium and titanium to provide good weld ductility and resistance to intergranular corrosion in the weld heat affected zone, which can be formed using a wide range of roll forming, mild stretch-bending or common drawing operations.
PROPERTIES
- Corrosion resistance in many exhaust gas environments
- Cyclic oxidation resistance
- Creep resistance
- Excellent formability and good weldability
- Good ductility
- Good for deep drawing
- Good high-temperature strength
- Good for polish
- Ease of fabrication
CHEMICAL COMPOSITION AND PHYSICAL PROPERTIES FOR 441
| Item | C% | Si% | Mn% | P% | S% | Ni% | Cr% | N% | Ti% | Nb% | Others |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | --- | --- | --- | --- | --- | --- | 17.50 | 0.10 | 0.3+3 | --- | |
| Max | 0.03 | 1.00 | 1.00 | 0.04 | 0.015 | --- | 18.50 | 0.60 | 1.00 | --- |
| Item | Tensile Test | Hardness Test | ||||
|---|---|---|---|---|---|---|
| 0.2%Y.S. | 1%Y.S. | T.S. | EL (%) | HRB | HV | |
| Min | 250 | --- | 430 | 18 | --- | --- |
| Max | N/mm2 | --- | 630 | --- | --- | --- |
APPLICATION
- Automotive exhaust manifold and other exhaust-system components
- Catalytic converter shells
- Clamps
- Kitchen catering appliance, such as work surfaces, shelving, extractor hoods and hobs, sinks,
- Wall panels and claddings
- Elevator panels, doors and frames
- Tubes
- Heat exchangers
- Exhaust system parts
SPECIFICATIONS
- ASTM A240M – Chromium and Chromium – Nickel Stainless Steel Plate, Sheet and Strip for Pressure Vessels and for General Applications.
- ASTM 480M – General Requirements for Flat Rolled Stainless and Heat-Resisting Steel Plate, Sheet and Strip
- EN 10088-2 (1.4509) – Stainless Steel Technical delivery conditions for sheet, plate and strip of corrosion resisting steels for general purposes
PRODUCT FORMS
RAW MATERIAL FINISHS & AVAILABLE SIZES
| 2D | A uniform, dull silver gray finish, which results from cold rolling followed by annealing and descaling. | |||||
|---|---|---|---|---|---|---|
| Range | 914 (3') | 1000 | 1219 (4') | 1250 | 1500 | 1524 (5') |
| 0.3mm ~ 3.0mm | ◇ | ◆ | ◆ | ◆ | ◆ | ◆ |
| 30GA ~ 11GA | ◇ | ◆ | ◆ | ◆ | ◆ | ◆ |
| 0.012" ~ 0.1196" | ◇ | ◆ | ◆ | ◆ | ◆ | ◆ |
| 2B (Mill Finish) |
A bright, cold-rolled finish resulting in the same manner as 2D finish, except that the annealed and descaled sheet received a final light roll pass through polished rolls. This is the general-purpose cold-rolled finish that can be used, or a preliminary step to polishing. | |||||
| Range | 914 (3') | 1000 | 1219 (4') | 1250 | 1500 | 1524 (5') |
| 0.3mm ~ 3.0mm | ◇ | ◆ | ◆ | ◆ | ◆ | ◆ |
| 30GA ~ 11GA | ◇ | ◆ | ◆ | ◆ | ◆ | ◆ |
| 0.012" ~ 0.1196" | ◇ | ◆ | ◆ | ◆ | ◆ | ◆ |
