ASTM A240 Type 441 Stainless Steel Sheet & Plate
ASTM A240 Type 441 Stainless Steel Sheet & Plate | 441 / UNS S44100
As a professional stainless steel supplier, SHH STEEL is pleased to present ASTM A240 Type 441 Stainless Steel Sheet and Plate. Also known as UNS S44100, this grade is an 18% chromium ferritic stainless steel dual-stabilized with titanium and niobium (columbium).
Type 441 provides higher high-temperature strength and better oxidation resistance than Type 409 or Type 439, while maintaining excellent formability and good corrosion resistance in exhaust gas environments. The dual stabilization ensures outstanding resistance to intergranular corrosion after welding. SHH STEEL supplies ASTM A240 Type 441 in both sheet and plate forms, covering thicknesses from 0.4 mm to 80 mm, with widths up to 1500–2000 mm and lengths up to 12000 mm. Custom sizes and surface finishes are available.
The material is typically delivered in the annealed condition with full Mill Test Certificates (EN 10204 3.1). Whether for thin sheet fabrication or heavier plate applications, SHH STEEL provides consistent quality for automotive exhaust, heat exchanger and industrial projects worldwide.
Material Specification
ASTM A240 Type 441 stainless steel sheet and plate are manufactured in accordance with ASTM A240/A240M and ASME SA-240.
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Primary Standard | ASTM A240 / ASME SA-240 Type 441 | Full compliance |
| UNS Designation | S44100 | Confirmed |
| Product Form | Sheet and Plate | Both available |
| Thickness Range | 0.4 mm – 80 mm | Custom sizes available |
| Width / Length | Up to 1500–2000 mm / 12000 mm | Custom fabrication supported |
| Surface Finish | 2B, BA, No.1 | Multiple options |
| Heat Treatment Condition | Annealed | Standard supply condition |
| Certification | EN 10204 3.1 / 3.2 | Available |
ASTM A240 Type 441 Chemical Composition
The chemical composition of ASTM A240 Type 441 is optimized for high-temperature performance through dual titanium and niobium stabilization.
| Element | Content (%) | Standard Limit | Role |
|---|---|---|---|
| Carbon (C) | ≤ 0.03 | 0.03 max | Low carbon for excellent weldability |
| Manganese (Mn) | ≤ 1.00 | 1.00 max | Deoxidation and strength |
| Phosphorus (P) | ≤ 0.040 | 0.040 max | Impurity control |
| Sulfur (S) | ≤ 0.030 | 0.030 max | Cleanliness |
| Silicon (Si) | ≤ 1.00 | 1.00 max | Deoxidation and oxidation resistance |
| Chromium (Cr) | 17.5 – 19.5 | 17.5 – 19.5 | Corrosion and oxidation resistance |
| Nickel (Ni) | ≤ 1.00 | 1.00 max | — |
| Nitrogen (N) | ≤ 0.03 | 0.03 max | Controlled |
| Titanium (Ti) | 0.10 – 0.50 | 0.10 – 0.50 | Stabilization |
| Niobium (Nb/Cb) | 0.3+(9×C) min – 0.90 max | 0.3+(9×C) min – 0.90 max | Dual stabilization, high-temperature strength |
ASTM A240 Type 441 Mechanical Properties
In the annealed condition, ASTM A240 Type 441 provides good strength and excellent formability.
| Property | Value | Test Method |
|---|---|---|
| Tensile Strength | ≥ 415 – 480 MPa | ASTM A370 |
| Yield Strength (0.2% Offset) | ≥ 240 – 310 MPa | ASTM A370 |
| Elongation in 50 mm | ≥ 20 – 30% | ASTM A370 |
| Hardness | ≤ 90 HRB | ASTM E18 |
| Density | 7.7 g/cm³ | — |
Delivery Conditions
SHH STEEL supplies ASTM A240 Type 441 primarily in the annealed condition. Detailed capabilities by surface finish are as follows:
2B Finish (Cold-rolled, annealed, pickled and skin-passed)
- Typical thickness range: 0.4 mm – 3.0 mm (up to 6.0 mm possible)
- Maximum width: up to 1500–2000 mm
- Most common finish for exhaust system components and general fabrication.
BA (Bright Annealed)
- Available in thinner gauges for specific applications.
No.1 Finish (Hot-rolled, annealed and pickled)
- Typical thickness range: 3.0 mm – 80 mm
- Standard finish for heavier plates.
Protective PVC film can be applied on one or both sides. Precision cutting (plasma, laser or waterjet) and closer dimensional tolerances are available upon request.
ASTM A240 Type 441 Tolerances
Dimensional tolerances for ASTM A240 Type 441 sheet and plate follow ASTM A480/A480M.
- Thickness tolerances vary by product form and thickness.
- Width tolerance is typically +6 mm / 0 mm or better for cold-rolled sheet.
- Length tolerance for cut-to-length material is normally +10 mm / 0 mm.
- Flatness is controlled according to ASTM A480; improved flatness can be supplied for precision fabrication.
- Edge conditions include mill edge, slit edge, sheared edge or plasma/laser cut edge according to customer preference.
Tighter tolerances can be arranged for special projects.
Weldability
ASTM A240 Type 441 offers excellent weldability for a ferritic stainless steel due to its low carbon content and dual titanium + niobium stabilization. It can be welded by common fusion processes such as GTAW (TIG), GMAW (MIG) and SMAW.
The dual stabilization effectively prevents intergranular corrosion in the heat-affected zone, making post-weld annealing unnecessary in most cases. Matching or suitable ferritic filler metals are recommended when matching properties are required. Heat input should be controlled to minimize grain growth. Preheating is generally not required for thin sections. Proper cleaning after welding is recommended to maintain corrosion resistance.
Equivalent Material Grades
| Grade | Standard | Designation |
|---|---|---|
| Type 441 | ASTM A240 / ASME SA-240 | — |
| UNS S44100 | Unified Numbering System | — |
| 1.4509 | EN 10088 | X2CrTiNb18 |
| SUS441 | JIS (reference) | — |
| Related Chinese grades | GB/T series | Dual-stabilized 18% Cr ferritic types |
| X2CrTiNb18 | DIN / EN | — |
Applications
ASTM A240 Type 441 is widely used where higher high-temperature strength and oxidation resistance than 409 or 439 are required. Typical applications are shown below with relevant keywords:
| Application Area | Typical Components / Uses (Keywords) |
|---|---|
| Automotive Exhaust Systems | Exhaust manifolds, pipes, catalytic converter components – A240 441 Automotive Exhaust |
| Heat Exchangers | Heat exchanger tubes and plates – A240 441 Heat Exchanger |
| High-Temperature Fabrication | Components requiring elevated temperature strength – A240 441 High Temperature |
| Industrial Exhaust Systems | Exhaust ducts and systems – A240 441 Industrial Exhaust |
| General Fabrication | Formed and welded parts needing good oxidation resistance – A240 441 Fabrication |
| Residential & Commercial Heating | Furnace and boiler components – A240 441 Heating |
Why Choose SHH STEEL
SHH STEEL maintains long-term strategic cooperation with major Chinese stainless steel mills and acts as a first-level (primary) agent for these mills. This direct partnership enables us to offer competitive pricing advantages, faster delivery times and consistent quality assurance that many intermediate traders cannot match.
All ASTM A240 Type 441 material is sourced from reputable Chinese mills under strict quality control, supplied with complete Mill Test Certificates, and supported by our professional export team. Customers benefit from reliable supply, short lead times, technical support and cost-effective solutions for automotive exhaust and industrial applications worldwide.
FAQ
- What is the main advantage of Type 441 compared with Type 409 or 439?Type 441 has higher chromium content (17.5–19.5%) and dual titanium + niobium stabilization. This provides superior high-temperature strength and oxidation resistance while maintaining excellent formability and weldability.
- Is Type 441 magnetic?Yes. Type 441 is a ferritic stainless steel and is magnetic.
- What is the UNS designation for ASTM A240 Type 441?Approximately 7.7 g/cm³.
- Why is Type 441 preferred for exhaust manifolds?It offers better high-temperature strength and oxidation resistance than Type 409 or 439, making it more suitable for the demanding thermal cycling and temperature conditions found in modern exhaust manifolds.
Conclusion
ASTM A240 Type 441 (UNS S44100) Stainless Steel Sheet and Plate from SHH STEEL deliver superior high-temperature strength and oxidation resistance through dual titanium-niobium stabilization and higher chromium content. With strict quality control, flexible sizing options, competitive pricing through direct mill partnerships and professional global export service, we provide trusted solutions for automotive exhaust systems, heat exchangers and industrial applications worldwide.
Contact SHH STEEL today for your ASTM A240 Type 441 (UNS S44100) requirements.
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