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Cold-Rolled 409L Stainless Steel Plate & Sheet ASTM JIS Standard Corrosion

China Cold-Rolled 409L Stainless Steel Plate & Sheet ASTM JIS Standard Corrosion

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Cold-Rolled 409L Stainless Steel Plate & Sheet ASTM JIS Standard Corrosion

MOQ： 50 kgs
Price： 1.2-3USD/Kg
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Payment Terms	L/C, T/T, Western Union
Supply Ability	20Ton per week
Delivery Time	5 - 12 days based on the quantity
Packaging Details	standard packing for export
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
Brand Name	BAOSTEEL TISCO
Model Number	416
Certification	ISO
Place of Origin	China

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Product Details
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Product Specification


Payment Terms	L/C, T/T, Western Union	Supply Ability	20Ton per week
Delivery Time	5 - 12 days based on the quantity	Packaging Details	standard packing for export
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
Brand Name	BAOSTEEL TISCO	Model Number	416
Certification	ISO	Place of Origin	China
High Light	409L stainless steel sheet ，cold-rolled stainless steel plate ，ASTM JIS stainless steel sheet

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.

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.

Q: Is 409L magnetic?
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.

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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Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative... Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative...

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