Stainless Steel 409 Explained
Stainless Steel 409 is a chromium-based ferritic stainless steel known for its good oxidation resistance, moderate corrosion resistance, and stable mechanical properties at elevated temperatures. It is widely used in automotive exhaust systems, structural fabrications, and heat-resistant industrial components. With better thermal conductivity than austenitic grades and good resistance to thermal fatigue, Grade 409 performs reliably in cyclic heat environments. Its affordability and dependable heat-resisting capability make it a cost-effective solution for large-scale industrial applications.
409 STAINLESS STEEL SHEETS AND PLATES EQUIVALENT GRADES
| STANDARD | UNS | WERKSTOFF NR. |
|---|---|---|
| SS 409 | S40900 | 1.4512 |
SPECIFICATION OF STAINLESS STEEL 409 SHEETS AND PLATES
| Standard | ASTM A240 / ASME SA240 |
|---|---|
| Dimension Standard | JIS, AISI, ASTM, GB, DIN, EN, etc |
| Width | 1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm, etc |
| Length | 2000mm, 2440mm, 3000mm, 5800mm, 6000mm, etc |
| Thickness | 0.3 mm to 120 mm |
| Form | Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Perforated Sheet, Chequered Plate, Strip, Flats, Blank (Circle), Ring (Flange) etc. |
| Surface Finishing | Hot rolled plate (HR), Cold rolled sheet (CR), 2B, 2D, BA, NO.1, NO.4, NO.8, 8K, mirror, Chequered, embossed, hair line, sand blast, Brush, etching, SATIN (Met with Plastic Coated) etc. |
CHEMICAL COMPOSITION OF STAINLESS STEEL 409 SHEETS AND PLATES
| Grade | C% | Mn% | P% | S% | Si% | Cr% | Ni% |
|---|---|---|---|---|---|---|---|
| SS 409 | 0.030 max | 1.00 max | 0.040 max | 0.020 max | 1.00 max | 10.5-11.7 | 0.50 max |
MECHANICAL PROPERTIES OF STAINLESS STEEL 409 SHEETS AND PLATES
| Tensile Strength | Yield Strength | Elongation (%) |
|---|---|---|
| 380 MPa min | 170 MPa min | 20 min |
💡 Practical Difference in Use
Use Stainless Steel 409 when: moderate corrosion resistance and high-temperature oxidation resistance are required, along with good weldability for automotive and industrial applications. → Example: automotive exhaust systems, mufflers, catalytic converters, and heat exchangers.
Applications of Stainless Steel 409 Sheets and Plates
Stainless Steel 409 is a ferritic stainless steel with approximately 11% chromium, optimized for oxidation resistance, thermal performance, and cost-effective fabrication in mildly corrosive environments.
- Automotive Exhaust Systems: Mufflers, catalytic converter components, and exhaust piping.
- Industrial Heating: Furnace parts, heat exchangers, and ducting.
- General Fabrication: Mildly corrosive enclosures, storage tanks, and industrial equipment.
When to Choose Stainless Steel 409?
Stainless Steel 409 is selected where moderate corrosion resistance, good high-temperature oxidation performance, and excellent weldability are required at a low cost.
Choose SS 409 when:
- Moderate corrosion resistance is sufficient
- High-temperature oxidation resistance is needed
- Good weldability is essential for fabrication
- Used in automotive and industrial exhaust applications
- Cost-effective ferritic stainless steel solution is preferred
Industries That Use Stainless Steel 409 Sheets and Plates
Stainless Steel 409 is commonly used in industries where mild corrosion resistance, thermal stability, and fabrication ease are required.
Primary application in exhaust and thermal components.
Uses
Exhaust systems, mufflers, catalytic converters, and piping.
Why SS 409?
Excellent balance of oxidation resistance, weldability, and cost-effectiveness.
Used in heat exchangers, ducting, and mildly corrosive enclosures.
Uses
Furnace components, industrial ducts, and storage tanks.
Why SS 409?
Good thermal performance and durability in moderate corrosive environments.
Used in fabricated components where moderate corrosion resistance and heat tolerance are required.
Uses
Fabricated enclosures, storage tanks, ducting systems, and general sheet metal components.
Why SS 409?
Economical ferritic stainless steel offering good thermal stability, formability, and moderate corrosion resistance.
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