Stainless Steel 409L Explained
Stainless Steel 409L is a low-carbon ferritic stainless steel specifically designed for improved weldability and enhanced resistance to intergranular corrosion. With good oxidation resistance at elevated temperatures and stable performance in mildly corrosive environments, 409L is widely used in automotive exhaust systems, heat exchangers, mufflers, and thermal equipment. Its low carbon content minimizes carbide precipitation during welding, ensuring structural integrity in fabricated components. Offering an excellent balance of corrosion resistance, heat resistance, and cost efficiency, Stainless Steel 409L is a reliable choice for high-temperature applications requiring long service life.
409L STAINLESS STEEL SHEETS AND PLATES EQUIVALENT GRADES
| STANDARD | UNS | WERKSTOFF NR. |
|---|---|---|
| SS 409L | S40903 | 1.4512 |
SPECIFICATION OF STAINLESS STEEL 409L 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 409L SHEETS AND PLATES
| Grade | C% | Si% | Mn% | Cr% | Ni% | P% | S% | Other Elements |
|---|---|---|---|---|---|---|---|---|
| SS 409L | 0.030 max | 1.00 max | 1.00 max | 10.50-11.70 | 0.50 max | 0.040 max | 0.030 max | Ti=6X(C+N)Min., 0.75Max |
MECHANICAL PROPERTIES OF STAINLESS STEEL 409L SHEETS AND PLATES
| Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HRB) max |
|---|---|---|---|
| 380 min | 170 min | 20 min | 88 |
💡 Practical Difference in Use
Use Stainless Steel 409L when: mild corrosion resistance, good weldability, and thermal resistance are required, especially for automotive and exhaust applications. → Example: automotive exhaust systems, mufflers, catalytic converter components, and heat exchangers.
Applications of Stainless Steel 409L Sheets and Plates
Stainless Steel 409L is a low-carbon ferritic stainless steel with chromium content, optimized for excellent oxidation resistance, weldability, and thermal performance in mildly corrosive environments.
- Automotive Industry: Exhaust systems, mufflers, catalytic converter parts.
- Industrial Heating: Heat exchangers, furnace components, and thermal equipment.
- General Fabrication: Mildly corrosive storage tanks, ducting, and enclosures.
When to Choose Stainless Steel 409L?
Stainless Steel 409L is selected where good corrosion resistance, high-temperature oxidation resistance, and excellent weldability are required without high cost.
Choose SS 409L when:
- Mild corrosion resistance is sufficient
- High thermal or oxidation resistance is required
- Excellent weldability is necessary for fabrication
- Used in automotive and industrial exhaust systems
- Cost-effectiveness is a priority
Industries That Use Stainless Steel 409L Sheets and Plates
Stainless Steel 409L is commonly used in industries where mild corrosion resistance and thermal stability are sufficient for operational needs.
Primary application due to good oxidation and weldability.
Uses
Exhaust systems, mufflers, catalytic converter components.
Why SS 409L?
Excellent balance of thermal resistance and weldability at a low cost.
Used for heat exchangers, furnace components, and mild corrosion applications.
Uses
Heat exchangers, ducting, storage tanks.
Why SS 409L?
Good oxidation resistance and easy fabrication in mildly corrosive environments.
Used in welded and fabricated components exposed to mildly corrosive environments.
Uses
Welded enclosures, storage tanks, fabricated panels, exhaust housings, and sheet metal parts.
Why SS 409L?
Low-carbon ferritic stainless steel with improved weldability, reduced carbide precipitation, and reliable corrosion resistance.
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