ASME SA240 441 Stainless Steel Plate | SA240 Type 441
What is ASME SA240 441 Stainless Steel Plate?
As a professional stainless steel plate supplier and China Mill-Direct Supply / Mill Direct Exporter, SHH STEEL is pleased to present ASME SA240 441 Stainless Steel Plate, also known as SA240 Type 441.
ASME SA240 Type 441 is a high-performance ferritic stainless steel containing approximately 17.5–18.5% chromium and dual-stabilized with niobium and titanium. This combination provides excellent resistance to intergranular corrosion after welding, improved high-temperature strength, and outstanding oxidation resistance. Type 441 offers noticeably higher mechanical strength than Type 409 or Type 439 while retaining good formability and weldability.
It is widely used as an upgraded material in automotive exhaust systems (especially in hotter sections such as manifolds, front pipes and catalytic converter shells), heat exchangers, and other high-temperature applications where better performance than 409/439 is required without the cost of austenitic grades.
SHH STEEL supplies ASME SA240 441 as true Mill Direct Supply, sourcing directly from major Chinese stainless steel mills. This model delivers competitive mill pricing, consistent quality, full heat traceability and shorter lead times. We offer both coil and plate products with surface finishes suitable for automotive and industrial applications.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Primary Standard | ASME SA240 / SA240M | Full compliance |
| Steel Grade | Type 441 (UNS S44100) | Confirmed |
| Product Form | Plate, Sheet, Coil | Available |
| Delivery Condition | Annealed | Standard |
| Thickness Range | 0.4 mm – 6.0 mm (thicker available on request) | Custom sizes supported |
| Width | Up to 1500 mm (wider on request) | Available |
| Length | Coil or cut-to-length | Available |
| Surface Finish | 2B, No.1, and others on request | Available |
| Certification | EN 10204 3.1 / ASME Mill Test Certificate | Available |
Chemical Composition
Heat Analysis (Ladle Analysis) according to ASME SA240 Type 441:
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.015 |
| Chromium (Cr) | 17.50 – 18.50 |
| Nickel (Ni) | ≤ 0.60 |
| Niobium (Nb) | 0.60 + 7 × (C + N) min, ≤ 1.00 max (typical range) |
| Titanium (Ti) | 0.10 – 0.60 (typical) |
| Nitrogen (N) | ≤ 0.030 |
| Iron (Fe) | Balance |
Product Analysis (typical permissible variations follow standard practices for dual-stabilized ferritic grades).
The dual stabilization with niobium and titanium, combined with higher chromium content, is the key feature of Type 441. Niobium contributes to higher elevated-temperature strength, while titanium and niobium together ensure excellent resistance to intergranular corrosion.
Mechanical Properties
Annealed Condition (typical)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 430 MPa (62 ksi) |
| Yield Strength (0.2%) | ≥ 260 MPa (38 ksi) |
| Elongation (in 50 mm) | ≥ 18–20% |
| Hardness | ≤ 180 HB |
Physical Properties
- Density: approximately 7.70–7.75 g/cm³
- Magnetic: Magnetic in all conditions
- Melting Range: approximately 1425–1510°C
Type 441 offers higher yield and tensile strength than Type 409 or 439, which is advantageous for thinner-wall designs and higher-temperature structural integrity in exhaust systems.
Material Comparison
| Grade | Cr Content | Stabilization | Strength Level | Primary Advantage | Typical Preference |
|---|---|---|---|---|---|
| SA240 Type 409 | 10.5–11.75% | Titanium | Lower | Lowest cost | Standard exhaust systems |
| SA240 Type 409L | 10.5–11.75% | Titanium | Lower | Improved weldability over 409 | Better-quality exhaust |
| SA240 Type 439 | 17–19% | Titanium | Medium | Good corrosion & oxidation resistance | Mid-range exhaust systems |
| SA240 Type 441 | 17.5–18.5% | Nb + Ti | Higher | Higher strength + excellent high-temp performance | Hotter exhaust sections, upgraded systems |
| SA240 Type 444 | 17.5–19.5% + Mo | Ti/Nb | Medium-High | Best pitting & SCC resistance among ferritics | Heat exchangers, demanding corrosion |
ASME SA240 441 is selected when higher mechanical strength and better high-temperature performance than 409 or 439 are required in automotive exhaust and similar applications. It bridges the gap between standard exhaust grades and more highly alloyed ferritics or austenitics. Related grades include astm a240 type 409 stainless steel sheet plate, astm a240 type 409l stainless steel sheet plate, and astm a240 type 439 stainless steel sheet plate.
Corrosion Resistance
ASME SA240 Type 441 offers good resistance to atmospheric corrosion and excellent resistance to high-temperature oxidation and scaling. The higher chromium content and dual stabilization provide better overall performance than Type 409/409L, particularly after welding and in cyclic high-temperature service.
It performs very well in automotive exhaust environments. For applications requiring higher resistance to pitting or stress corrosion cracking, molybdenum-bearing grades such as Type 444 should be considered.
Weldability
ASME SA240 Type 441 has excellent weldability for a ferritic stainless steel due to dual niobium + titanium stabilization and low carbon content. The risk of intergranular corrosion is minimal.
Low heat input is recommended to control grain growth. Matching or suitable ferritic filler metals are preferred. It is readily welded by resistance, MIG, TIG and laser processes commonly used in automotive manufacturing.
Heat Treatment
Type 441 is a ferritic stainless steel and cannot be hardened by quenching and tempering.
Annealing
- Temperature: typically 800 – 900°C
- Cooling: Air cool
Annealing relieves stresses after cold working or welding and restores ductility. Time at temperature should be controlled to avoid excessive grain growth.
Surface Finishes
| Finish | Description | Typical Use / Keywords |
|---|---|---|
| 2B | Cold-rolled, annealed, pickled, skin-passed | SA240 441 2B – most common for automotive exhaust systems |
| No.1 | Hot-rolled, annealed and pickled | SA240 441 No.1 – industrial plate |
| Special | Bright or custom finishes | SA240 441 Special – on request |
SHH STEEL regularly supplies ASME SA240 441 in 2B finish (especially in coil form) and No.1 finish for plate products.
Tolerances
Dimensional tolerances for ASME SA240 441 Stainless Steel Plate conform to ASME SA240 and the general requirements of ASTM A480.
Typical available size range for SA240 441 plate/sheet/coil:
- Thickness: 0.4 mm – 6.0 mm (thicker plates available on request)
- Width: up to 1500 mm (wider on request)
- Form: Coil or cut-to-length plate
Thickness, width and flatness tolerances are controlled within standard limits. Tighter tolerances for SA240 441 can be arranged for specific automotive or project needs. SHH STEEL provides precise dimensional control for both coil and plate products.
Equivalent Material Grades
| Grade / Designation | Standard | Notes |
|---|---|---|
| SA240 Type 441 | ASME SA240 | — |
| A240 Type 441 | ASTM A240 | Essentially identical |
| UNS S44100 | — | Unified Numbering System |
| 1.4509 / X2CrTiNb18 | EN 10088-2 | European equivalent |
| SUS441 | JIS related | Japanese equivalent |
| Related Nb+Ti stabilized | GB/T | Chinese approximate equivalents |
Related grades frequently evaluated with ASME SA240 441 include astm a240 type 409 stainless steel sheet plate, astm a240 type 409l stainless steel sheet plate, astm a240 type 439 stainless steel sheet plate, and astm a240 type 444 stainless steel sheet plate.
Applications
ASME SA240 Type 441 is primarily used in higher-performance automotive exhaust and high-temperature applications. Typical applications of SA240 441 include:
| Industry / Sector | Typical Components / Equipment (with keywords) |
|---|---|
| Automotive Exhaust | SA240 441 manifolds, front pipes, catalytic converter shells, hotter exhaust sections |
| Heat Exchangers | SA240 441 heat exchanger components |
| Furnace & Heat Treatment | SA240 441 furnace parts and heat-resistant components |
| Powertrain & Emission Systems | SA240 441 emission control components |
| General Fabrication | SA240 441 formed and welded high-temperature structures |
| Industrial Exhaust Systems | SA240 441 ducting and high-temperature exhaust components |
Why Choose SHH STEEL
SHH STEEL is a China Mill-Direct Supply and Mill Direct Exporter of stainless steel plate. We maintain long-term strategic cooperation with major Chinese stainless steel mills and supply ASME SA240 Type 441 with the following advantages:
- Competitive mill-direct pricing
- Consistent quality and complete heat traceability
- Full Mill Test Certificates (EN 10204 3.1 / 3.2 ASME)
- Coil and plate supply with flexible dimensions
- Surface finishes including SA240 441 2B and SA240 441 No.1
- Technical support for automotive exhaust and high-temperature applications
- Reliable worldwide logistics and export documentation
FAQ
- What is the main advantage of SA240 441 over SA240 409 or 439?Type 441 offers higher mechanical strength, better high-temperature performance and excellent dual stabilization (Nb + Ti), making it suitable for hotter sections of exhaust systems. SHH STEEL recommends 441 when upgraded performance over 409/439 is required.
- Is ASME SA240 441 magnetic?Yes, Type 441 is magnetic in all conditions. SHH STEEL supplies material that meets this characteristic.
- Can SA240 441 be hardened by heat treatment?No. As a ferritic stainless steel, it cannot be hardened by quenching and tempering. SHH STEEL supplies material in the annealed condition as standard.
- What is the density of SA240 Type 441?Approximately 7.70–7.75 g/cm³. SHH STEEL provides material certificates confirming physical and mechanical properties.
- Can SHH STEEL supply dual-certified ASME SA240 / ASTM A240 Type 441?Yes, SHH STEEL commonly supplies dual-certified ASME SA240 / ASTM A240 Type 441 material.
Conclusion
ASME SA240 441 Stainless Steel Plate (SA240 Type 441) is a dual-stabilized (niobium + titanium) high-chromium ferritic stainless steel that delivers higher strength, excellent high-temperature oxidation resistance and superior weldability. It is an excellent upgraded material for automotive exhaust systems and other high-temperature applications requiring better performance than standard 409 or 439 grades.
As a professional China Mill-Direct Supply and Mill Direct Exporter, SHH STEEL provides high-quality ASME SA240 Type 441 plate and coil with competitive pricing, full certification and complete technical support.
Contact SHH STEEL today for stock availability, coil or plate options, surface finishes (including SA240 441 2B and SA240 441 No.1), or a competitive quotation.
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