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Cold-Rolled 409L Stainless Steel Plate & Sheet ASTM JIS Standard Corrosion Resistance & Weldability
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xProduct Details
| Products | Stainless Steel Plate | Grade | 409L |
|---|---|---|---|
| Thickness | 0.5-50.0mm | Tech | Cold Rolled,hot Rolled , Forged |
| Width | 1000mm 1219mm 1500mm Or Customs As Request | Surface | 2D NO.1 |
| Standard | ASTM GB JIS EN DIN | MOQ | 1 Ton |
Product Description
Cold-Rolled 409L Stainless Steel Plate & Sheet ASTM JIS Standard Corrosion Resistance & Weldability
Stainless Steel Plate Specifications
| Name | 409L stainless steel Plate |
| Our Grade |
200 Series: 201 202 300 Series: 301 304,304L,304H,309S,310S,314,316L,316Ti,316H,316LN,317L,321,329,347 400 Series: 409L,410,410S,415,416,420,430,431,436L.439,441,443,444,445,446 Super Stainless Steel: 904L,926,254SMO,654SMO,15-5PH,17-4PH,17-7PH.etc Nickel Alloy: C276, C22,G35,Alloy X,Monel 400,K500,Inconel 600,601,617,625,718,Incoloy 800,800H,800HT,825.etc |
| Technique | Hot Rolled, Cold Rolled,Forged |
| Standard | JIS, AISI, ASTM, DIN, TUV, BV, SUS, etc |
| Thickness | 0.1 – 80.0mm |
| Width range | 10mm – 2000mm |
| Length | Customized |
| Finish | 2B, BA, No.4, 8k, Brushed,Hairline,PVD Coating,Sandblasted |
| Service | Laser Cutting, Bending |
| Sample | Available |
Product Overview
Cold-rolled 409L stainless steel plate and sheet represent a high-performance, cost-effective solution for applications demanding excellent weldability, moderate corrosion resistance, and thermal stability—particularly in the automotive, transportation, and industrial exhaust sectors. Manufactured to stringent international standards including ASTM A240/A666 and JIS G 4305, this ferritic stainless steel grade combines low carbon content with titanium stabilization to deliver reliable performance under cyclic heating and mechanical stress.
Unlike hot-rolled variants, cold-rolled 409L offers tighter dimensional tolerances, smoother surface finish, enhanced strength, and improved formability, making it ideal for precision components such as catalytic converter shells, muffler tubes, heat shields, and emission control systems.
Why 409L? The Science Behind the Performance
409L (UNS S40903) is a low-carbon, titanium-stabilized ferritic stainless steel. Its composition is engineered to overcome the limitations of standard 409 stainless steel:
- Carbon (C) ≤ 0.03%: Minimizes chromium carbide formation during welding or high-temperature exposure.
- Titanium (Ti) ≥ 6×C: Binds free carbon, preventing sensitization and intergranular corrosion.
- Chromium (Cr): 10.5–11.7%: Provides baseline oxidation and corrosion resistance.
This microstructural stability ensures that 409L maintains integrity even after repeated thermal cycles from –30°C to 650°C (–22°F to 1202°F)—a common operating range in modern exhaust systems.
Key Advantages of Cold-Rolled 409L
| Feature | Benefit |
|---|---|
| Cold Rolling Process | Improves surface smoothness, dimensional accuracy, and mechanical strength vs. hot-rolled counterparts |
| Excellent Weldability | No post-weld annealing required; minimal risk of cracking or embrittlement |
| Good Formability | Suitable for bending, stamping, and deep drawing without edge cracking |
| Moderate Corrosion Resistance | Resists rust, condensation acids, and road salts better than mild steel |
| Cost Efficiency | Lower nickel content reduces material cost vs. austenitic grades (e.g., 304) |
| Magnetic Properties | Enables use in automated assembly lines with magnetic handling systems |
| Eco-Friendly | Fully recyclable (>95% recovery rate); supports automotive sustainability goals |
Technical Specifications
Chemical Composition (Typical, wt%)
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.03 |
| Chromium (Cr) | 10.5 – 11.7 |
| Titanium (Ti) | ≥ 6×C, max 0.75 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.030 |
| Nickel (Ni) | ≤ 0.50 |
| Iron (Fe) | Balance |
Complies with ASTM A240, JIS G 4305, EN 10088-2, and ISO 15510.
Mechanical Properties (Cold-Rolled, Annealed Condition)
| Property | Typical Value |
|---|---|
| Tensile Strength (Rm) | 415 – 520 MPa |
| Yield Strength (Rp0.2) | 275 – 380 MPa |
| Elongation (A₅₀) | ≥ 20% |
| Hardness (HRB) | ≤ 85 HRB |
| Density | 7.75 g/cm³ |
| Thermal Conductivity (100°C) | ～25.8 W/m·K |
| Coefficient of Thermal Expansion (20–100°C) | 10.6 × 10⁻⁶ /K |
Note: Cold rolling increases yield and tensile strength while slightly reducing elongation compared to hot-rolled material.
Surface Finish Options
Cold-rolled 409L sheets are typically supplied with one of the following finishes:
- 2B Finish: Bright, semi-reflective surface achieved by cold rolling, annealing, and light skin-pass rolling. Ideal for painted or coated parts.
- BA (Bright Annealed): Mirror-like finish (less common for 409L due to cost).
- No. 1 Finish: Matte, descaled surface (more typical of hot-rolled; available on request for cold-rolled).
For exhaust applications, 2B finish is most widely used due to its balance of smoothness, flatness, and paint adhesion.
Standards Compliance
Our cold-rolled 409L stainless steel meets or exceeds the following global standards:
| Standard | Description |
|---|---|
| ASTM A240/A240M | Standard specification for chromium stainless steel plate, sheet, and strip |
| ASTM A666 | Annealed or cold-finished austenitic/ferritic stainless steel products |
| JIS G 4305 | Cold-rolled stainless steel plates, sheets, and strips (Japanese Industrial Standard) |
| EN 10088-2 | Technical delivery conditions for sheet/plate in Europe |
| ISO 15510 | International chemical composition standard |
Mill Test Certificates (MTCs) per EN 10204 3.1 are provided with every shipment.
Applications
Cold-rolled 409L is extensively used in:
- Automotive Exhaust Systems:
- Catalytic converter housings
- Mufflers and resonators
- Tailpipes and intermediate pipes
- Heat shields and brackets
- Commercial Vehicles & Motorcycles:
- Diesel exhaust fluid (DEF) tanks (non-contact areas)
- After-treatment system components
- Industrial Equipment:
- Low-pressure steam lines
- Furnace parts (non-critical zones)
- Agricultural machinery exhausts
Each passenger vehicle uses approximately 40–60 kg of 409L stainless steel, underscoring its dominance in emission-compliant design.
Fabrication Guidelines
Welding
- Compatible with TIG (GTAW), MIG (GMAW), and resistance spot welding.
- No preheating needed; avoid prolonged exposure above 600°C in HAZ.
- Use matching filler metal (e.g., ER430 or ER409L) for critical joints.
Forming
- Excellent cold formability for radii ≥ 2× material thickness.
- Avoid sharp bends or excessive stretching to prevent edge cracking.
Machining
- Moderate machinability; use sharp tools, low speeds, and adequate coolant.
- Not recommended for high-precision threading or fine finishing.
Heat Treatment
- Not hardenable by heat treatment (ferritic structure).
- Anneal at 780–850°C followed by air cooling to restore ductility after severe cold working.
Packaging & Delivery
To ensure quality during transit:
- Sheets/coils wrapped in anti-rust VCI paper
- Protected with plastic edge guards and wooden pallets
- Sealed in moisture-proof packaging for ocean freight
- Custom cutting available (slitting, blanking, leveling)
Available Dimensions:
- Thickness: 0.3 mm to 4.0 mm (cold-rolled range)
- Width: 600 mm to 1500 mm
- Length: 1000 mm to 6000 mm (cut-to-length) or in coil form
Environmental & Economic Benefits
- Reduces vehicle weight vs. aluminized steel → improves fuel economy
- Extends service life of exhaust systems (2–3× longer than mild steel)
- Low lifecycle cost due to minimal maintenance and replacement needs
- Supports global emission standards (Euro 6, EPA Tier 3, China 6)
Frequently Asked Questions (FAQ)
Q: Is cold-rolled 409L stronger than hot-rolled?
A: Yes—cold rolling increases yield and tensile strength by 10–20% due to strain hardening.
A: Yes—cold rolling increases yield and tensile strength by 10–20% due to strain hardening.
Q: Can 409L be used outdoors long-term?
A: It performs well in rural and urban atmospheres but may show light rust in coastal/salty environments. For harsh conditions, consider 439 or 316L.
A: It performs well in rural and urban atmospheres but may show light rust in coastal/salty environments. For harsh conditions, consider 439 or 316L.
Q: Is 409L magnetic?
A: Yes—its ferritic structure makes it strongly magnetic, which aids in robotic assembly.
A: Yes—its ferritic structure makes it strongly magnetic, which aids in robotic assembly.
Q: What’s the maximum continuous service temperature?
A: 650°C (1202°F). Short-term peaks up to 750°C are tolerable but may accelerate scaling.
A: 650°C (1202°F). Short-term peaks up to 750°C are tolerable but may accelerate scaling.
Conclusion
Cold-rolled 409L stainless steel plate and sheet offer the optimal blend of affordability, fabricability, and performance for modern high-temperature applications. Backed by ASTM and JIS certifications, and trusted by global OEMs, it remains the go-to material for next-generation exhaust and emission control systems.
Whether you're designing for durability, compliance, or cost-efficiency, our cold-rolled 409L delivers consistent quality batch after batch.
Contact us today for technical data sheets, samples, or volume quotations—and power your innovation with a material built for the road ahead.
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