JIS G4305 SUS409 Steel Plate | 409 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 SUS409 Steel Plate (also known as 409 stainless steel).
SUS409 is a 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 addition, it provides good resistance to high-temperature oxidation, reliable weldability and formability. It is one of the most widely used grades for automotive exhaust systems and other heat-resistant applications. The grade is fully magnetic and offers an economical solution compared with higher-alloyed stainless steels. Common surface finishes include 2B, BA and No.4.
SHH STEEL supplies SUS409 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 | SUS409 | 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) | ≤ 0.08 |
| 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 – 0.75 |
| Nickel (Ni) | ≤ 0.60 |
Note: Titanium stabilization improves weldability and resistance to intergranular corrosion compared with non-stabilized 11% Cr grades.
Mechanical Properties
Mechanical properties of JIS G4305 SUS409 (annealed condition):
| Property | Value |
|---|---|
| Yield Strength (0.2%) | ≥ 175 MPa |
| Tensile Strength | ≥ 360 MPa |
| Elongation | ≥ 22% |
| 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 SUS409 according to customer requirements.
Delivery Conditions
SHH STEEL supplies JIS G4305 SUS409 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
- Good high-temperature oxidation resistance
- Reliable weldability due to titanium stabilization
- Good formability
- Fully magnetic
- Cost-effective grade for exhaust and heat-resistant applications
- Available in 409 BA, 409 2B and 409 No.4 finishes
- Widely used as a standard material for automotive exhaust systems
Equivalent Material Grades
| Grade | Standard | Notes |
|---|---|---|
| SUS409 | JIS G4305 | — |
| 409 | ASTM A240 | American equivalent |
| 1.4512 / X2CrTi12 | EN 10088-2 | European equivalent |
| 0Cr11Ti | GB/T 3280 | Chinese equivalent |
| UNS S40900 | — | Unified Numbering System |
Applications
JIS G4305 SUS409 (409 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 – 409 Exhaust |
| Heat-Resistant Parts | Heat shields, furnace components – 409 Heat Resistant |
| Industrial Equipment | Ducts, silencers, thermal parts – 409 Industrial |
| General Fabrication | Formed and welded high-temperature parts – 409 Fabrication |
| Agricultural & Construction | Exhaust and heat-related components – 409 Construction |
Why Choose SHH STEEL
SHH STEEL provides SUS409 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 SUS409 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
- What is the difference between SUS409 and SUS409L?SUS409L has lower carbon content (≤0.03%) than SUS409 (≤0.08%), offering slightly better weldability and resistance to intergranular corrosion. Both are titanium-stabilized and widely used in exhaust systems.
- What is the density of SUS409?Approximately 7.75 g/cm³.
Conclusion
JIS G4305 SUS409 Steel Plate (409 BA/2B/NO.4 Stainless Steel) from SHH STEEL is a titanium-stabilized ferritic stainless steel offering good high-temperature performance, reliable weldability and cost efficiency. As Mill Direct Supply, we provide competitive pricing, consistent quality and full technical support. Trust SHH STEEL for your SUS409 stainless steel requirements.
Contact SHH STEEL today for stock availability, pricing and technical support. JIS G4305 SUS409 Steel Plate, SUS409, 409 BA, 409 2B, 409 No.4, 409 stainless steel plate, SUS409 supplier
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