JIS G4305 SUS409L Steel Plate | 409L BA/2B/NO.4 Stainless Steel
General Description
As a professional stainless steel supplier and China Mill-Direct Exporter, SHH STEEL is pleased to present JIS G4305 SUS409L Steel Plate (also known as 409L stainless steel).
SUS409L is a low-carbon, titanium-stabilized ferritic stainless steel under the Japanese standard JIS G4305 for cold-rolled stainless steel plates, sheets and strips. With approximately 10.5–11.75% chromium and titanium stabilization, it offers excellent resistance to high-temperature oxidation, very good weldability and formability. It is widely used in automotive exhaust systems and other heat-resistant applications. The grade is fully magnetic and more economical than higher-chromium or austenitic stainless steels. Common surface finishes include 2B, BA and No.4.
SHH STEEL supplies SUS409L as Mill Direct Supply, sourcing directly from major Chinese stainless steel mills. This ensures competitive mill pricing, consistent quality, shorter lead times and full traceability. We offer thicknesses from 0.4 mm to 3.0 mm (thicker gauges available), widths up to 1500 mm, in coil or cut-to-length form. All materials are delivered with full Mill Test Certificates.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Primary Standard | JIS G4305 | Full compliance |
| Steel Grade | SUS409L | Confirmed |
| Product Form | Cold-rolled Plate / Sheet / Coil | Available |
| Surface Finish | 2B, BA, No.4 | Available |
| Thickness Range | 0.4 mm – 3.0 mm | Custom sizes available |
| Width | Up to 1500 mm | Available |
| Certification | EN 10204 3.1 / Mill Certificate | Available |
Chemical Composition
Chemical composition according to JIS G4305 (Heat Analysis):
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.03 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 10.50 – 11.75 |
| Titanium (Ti) | 6×(C+N) – 0.75 |
| Nickel (Ni) | ≤ 0.60 |
Note: Titanium stabilization combined with very low carbon content ensures excellent weldability and resistance to intergranular corrosion.
Mechanical Properties
Mechanical properties of JIS G4305 SUS409L (annealed condition):
| Property | Value |
|---|---|
| Yield Strength (0.2%) | ≥ 175 MPa |
| Tensile Strength | ≥ 360 MPa |
| Elongation | ≥ 25% |
| Hardness | ≤ 162 HB |
Density: Approximately 7.75 g/cm³ Magnetic: Yes (ferritic)
Surface Finishes
| Finish | Description | Typical Applications |
|---|---|---|
| 2B | Cold-rolled, annealed, pickled, skin-passed – smooth matte finish | General fabrication, exhaust components |
| BA | Bright Annealed – high reflectivity | Clean and decorative applications |
| No.4 | Brushed finish | Decorative and visible parts |
SHH STEEL supplies 2B, BA and No.4 finishes for SUS409L according to customer requirements.
Delivery Conditions
SHH STEEL supplies JIS G4305 SUS409L as Mill Direct Supply in cold-rolled annealed condition with 2B, BA or No.4 finish.
Additional options available:
- Coil or cut-to-length sheets
- Protective film
- Third-party inspection (SGS, BV, TUV, etc.)
Key Characteristics
- Excellent high-temperature oxidation resistance
- Outstanding weldability due to Ti stabilization and low carbon
- Good formability and deep-drawing performance
- Fully magnetic
- Cost-effective solution for exhaust and heat-resistant applications
- Available in 409L BA, 409L 2B and 409L No.4 finishes
- Better resistance to intergranular corrosion than non-stabilized 409
Equivalent Material Grades
| Grade | Standard | Notes |
|---|---|---|
| SUS409L | JIS G4305 | — |
| 409L / 409 | ASTM A240 | American equivalent |
| 1.4512 / X2CrTi12 | EN 10088-2 | European equivalent |
| 022Cr11Ti | GB/T 3280 | Chinese equivalent |
| UNS S40910 / S40900 | — | Unified Numbering System |
Applications
JIS G4305 SUS409L (409L BA/2B/No.4) is primarily used in high-temperature and exhaust-related applications. Typical uses include:
| Application Area | Typical Components / Uses (Keywords) |
|---|---|
| Automotive Exhaust Systems | Exhaust pipes, mufflers, catalytic converter shells – 409L Exhaust |
| Heat-Resistant Parts | Heat shields, furnace components – 409L Heat Resistant |
| Industrial Equipment | Ducts, silencers, thermal parts – 409L Industrial |
| General Fabrication | Formed and welded high-temperature parts – 409L Fabrication |
| Agricultural & Construction | Exhaust and heat-related components – 409L Construction |
Why Choose SHH STEEL
SHH STEEL provides SUS409L as Mill Direct Supply. We maintain long-term strategic cooperation with major Chinese stainless steel mills and act as a first-level agent. This direct mill supply model allows us to offer competitive mill-direct pricing, faster delivery times, consistent surface quality (2B, BA and No.4), and full Mill Test Certificates for JIS G4305 SUS409L Steel Plate.
Customers benefit from reliable supply, short lead times and cost-effective solutions for titanium-stabilized ferritic stainless steel projects, especially automotive exhaust applications. Our professional export team provides technical support on material selection, surface finishes and processing.
FAQ
- Why is SUS409L widely used in automotive exhaust systems?It offers excellent high-temperature oxidation resistance, very good weldability (thanks to Ti stabilization), good formability and significantly lower cost than austenitic grades.
- What is the difference between 2B, BA and No.4 finishes?2B is a smooth matte finish for general use. BA is bright annealed with higher reflectivity. No.4 is a brushed finish commonly used for visible or decorative parts.
Conclusion
JIS G4305 SUS409L Steel Plate (409L BA/2B/NO.4 Stainless Steel) from SHH STEEL is a titanium-stabilized ferritic stainless steel offering excellent high-temperature performance, superior weldability and cost efficiency. As Mill Direct Supply, we provide competitive pricing, consistent quality and full technical support. Trust SHH STEEL for your SUS409L stainless steel requirements.
Contact SHH STEEL today for stock availability, pricing and technical support. JIS G4305 SUS409L Steel Plate, SUS409L, 409L BA, 409L 2B, 409L No.4, 409L stainless steel plate, SUS409L supplier
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