JIS G4305 SUS309S Steel Plate | 309S Stainless Steel
What is JIS G4305 SUS309S Steel Plate?
As a professional stainless steel supplier and China Mill-Direct Exporter, SHH STEEL is pleased to present JIS G4305 SUS309S Steel Plate (also known as 309S stainless steel).
SUS309S is a low-carbon austenitic stainless steel under the Japanese standard JIS G4305 for cold-rolled stainless steel plates, sheets and strips. It contains high chromium (22–24%) and high nickel (12–15%), providing outstanding resistance to high-temperature oxidation and good strength at elevated temperatures. The low carbon content improves weldability and reduces the risk of intergranular corrosion. SUS309S is widely used for furnace parts, heat treatment equipment, radiant tubes and other high-temperature applications.
SHH STEEL supplies SUS309S 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 0.5 mm to 6.0 mm (thicker plates available on request), 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 | SUS309S | Confirmed |
| Product Form | Cold-rolled Plate / Sheet / Coil | Available |
| Surface Finish | 2B, BA, No.1, No.4 (common) | Available |
| Thickness Range | 0.5 mm – 6.0 mm (standard) | 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) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 22.00 – 24.00 |
| Nickel (Ni) | 12.00 – 15.00 |
Note: High chromium and nickel contents provide excellent resistance to oxidation at temperatures up to approximately 1000–1100°C in continuous service.
Mechanical Properties
Mechanical properties of JIS G4305 SUS309S (annealed condition):
| Property | Value |
|---|---|
| Yield Strength (0.2%) | ≥ 205 MPa |
| Tensile Strength | ≥ 520 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 187 HB |
Density: Approximately 7.90 g/cm³ Magnetic: Non-magnetic in annealed condition.
Surface Finishes
| Finish | Description | Typical Applications |
|---|---|---|
| 2B | Cold-rolled, annealed, pickled, skin-passed | General fabrication |
| BA | Bright Annealed | Cleaner surface applications |
| No.1 | Hot-rolled, annealed and pickled (thicker plates) | High-temperature equipment |
| No.4 | Brushed finish | Visible parts |
Delivery Conditions
SHH STEEL supplies JIS G4305 SUS309S as Mill Direct Supply in annealed condition.
Additional options available:
- Coil or cut-to-length sheets/plates
- Protective film
- Third-party inspection (SGS, BV, TUV, etc.)
Key Characteristics
- Excellent high-temperature oxidation resistance
- Good strength at elevated temperatures
- Superior weldability due to low carbon content
- Good resistance to thermal fatigue
- Non-magnetic in annealed condition
- Suitable for continuous service up to approximately 1000–1100°C
- Better high-temperature performance than 304/304L
Equivalent Material Grades
| Grade | Standard | Notes |
|---|---|---|
| SUS309S | JIS G4305 | — |
| 309S | ASTM A240 | American equivalent |
| 1.4833 / X12CrNi23-13 | EN 10088-2 | European equivalent |
| 06Cr23Ni13 | GB/T 3280 | Chinese equivalent |
| UNS S30908 | — | Unified Numbering System |
Applications
JIS G4305 SUS309S is primarily used in high-temperature environments. Typical applications include:
| Application Area | Typical Components / Uses (Keywords) |
|---|---|
| Heat Treatment Equipment | Furnace parts, radiant tubes, muffles – 309S Furnace |
| Industrial Furnaces | Retorts, fixtures, baskets – 309S Heat Treatment |
| Chemical & Petrochemical | High-temperature reactors and components – 309S Chemical |
| Power Generation | Boiler components, heat exchangers – 309S Power |
| Automotive & Exhaust | High-temperature exhaust parts – 309S Exhaust |
| General High-Temperature Use | Thermal equipment – 309S High Temperature |
Why Choose SHH STEEL
SHH STEEL provides SUS309S 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 quality, and full Mill Test Certificates for JIS G4305 SUS309S Steel Plate.
Customers benefit from reliable supply, short lead times and cost-effective solutions for high-temperature austenitic stainless steel projects. Our professional export team provides technical support on material selection and high-temperature applications.
FAQ
- What is the main advantage of SUS309S over SUS304?SUS309S has significantly higher chromium and nickel content, providing much better oxidation resistance and strength at high temperatures (up to 1000–1100°C).
- What does the “S” in SUS309S mean?The “S” indicates low carbon content (≤0.08%), which improves weldability and reduces the risk of intergranular corrosion.
Conclusion
JIS G4305 SUS309S Steel Plate (309S Stainless Steel) from SHH STEEL is a high-chromium, high-nickel austenitic stainless steel offering excellent high-temperature oxidation resistance and good weldability. As Mill Direct Supply, we provide competitive pricing, consistent quality and full technical support. Trust SHH STEEL for your SUS309S stainless steel requirements.
Contact SHH STEEL today for stock availability, pricing and technical support. JIS G4305 SUS309S Steel Plate, SUS309S, 309S stainless steel, 309S stainless steel plate, SUS309S supplier
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