409 Stainless Steel Coil

Stellanox Steel provides high-quality 409 Stainless Steel Coils, ideal for applications where good corrosion resistance, weldability, and high-temperature strength are required at an economical cost. These coils are widely used in automotive exhaust systems, heat exchangers, and industrial ventilation due to their resistance to oxidation and corrosion in moderate environments.

409 stainless steel offers the perfect balance between cost-effectiveness and performance, especially where appearance is not a critical concern.

What is 409 Stainless Steel Coil?

409 Stainless Steel Coil is a ferritic stainless steel stabilized with titanium, offering moderate corrosion resistance and excellent oxidation resistance up to 675°C. Its composition is tailored for high-temperature service while maintaining cost efficiency and formability.

It is commonly supplied in annealed or skin-passed conditions with finishes such as 2D or dull gray. Its ferritic structure allows for magnetic response and good thermal conductivity.

Products
Stainless Steel
Carbon Steel
Duplex Stainless Steel
Super Duplex Stainless Steel
Alloy Steel
Titanium
Hastelloy
Inconel
Monel
Aluminium
Copper
Pure Nickel
Flanges
Forged Fittings
Valves
Fasteners

Key Features of 409 Stainless Steel Coil

  • Titanium Stabilized: Enhances resistance to intergranular corrosion.
  • High Oxidation Resistance: Performs well up to 675°C.
  • Good Weldability: Easily joined with standard welding techniques.
  • Economical Alternative: Lower cost than austenitic stainless steel grades.
  • Magnetic Properties: Ferritic structure supports magnetic applications.
  • High-Temperature Durability: Ideal for auto exhaust and furnace applications.

Specification Chart – 409 Stainless Steel Coil

PropertyDetails
Grade409 (UNS S40900)
StandardsASTM A240, EN 10088-2, JIS G4305
Thickness Range0.4 mm – 3 mm
Width Range20 mm – 1600 mm
Coil ID / OD508 mm ID, OD customizable
Surface Finishes2D, Dull Gray, HRAP (Hot Rolled Annealed Pickled)
Processing OptionsSlitting, Cut-to-Length, Oil Coating, Skin Pass
Edge ConditionMill Edge, Slit Edge

Chemical Composition – 409 Stainless Steel Coil

ElementComposition (%)
Chromium (Cr)10.5 – 11.75
Carbon (C)≤ 0.08
Manganese (Mn)≤ 1.00
Silicon (Si)≤ 1.00
Phosphorus (P)≤ 0.045
Sulfur (S)≤ 0.020
Titanium (Ti)≥ 6xC min to 0.75
Iron (Fe)Balance

Mechanical Properties – 409 Stainless Steel Coil

PropertyValue
Tensile Strength (MPa)≥ 380
Yield Strength (MPa)≥ 170
Elongation (%)≥ 20
Hardness (HRB)≤ 90
Density7.80 g/cm³

Equivalent Grades

StandardGrade
ASTM409
EN1.4512
JISSUS 409
UNSS40900
DINX2CrTi12

409 Stainless Steel Coil Weight Chart

Thickness (mm)Weight per m² (kg)
0.53.90
0.86.24
1.07.80
1.511.70
2.015.60
2.519.50
3.023.40

Applications of 409 Stainless Steel Coil

  • Automotive Exhaust Systems
  • Mufflers, Tailpipes, Catalytic Converter Shells
  • Heat Shields and Engine Covers
  • Industrial Furnaces and Burners
  • Commercial Kitchen Equipment
  • Chimney Liners and Ventilation Ducts
  • HVAC Ductwork and Support Systems

Benefits of 409 Stainless Steel Coil

  • Cost-effective stainless steel with good heat resistance
  • Stabilized against weld heat-affected corrosion
  • Easily weldable and formable
  • Scales minimally at high temperatures
  • Magnetic—suitable for specific industrial applications
  • Durable in automotive and thermal systems

Frequently Asked Questions

Explore our FAQs for insights on materials, customization, and delivery.
Is 409 stainless steel pipe rust-resistant?
Yes, 409 provides moderate corrosion resistance and is much better than carbon steel, though not as high as 304 or 316 stainless.
Can 409 stainless pipe be welded easily?
Yes, 409 is weldable using standard techniques, and post-weld annealing is usually not required.
Is 409 suitable for marine environments?
No, it is not ideal for marine or highly chloride-exposed environments. 316 or duplex grades are better suited for that.
Can I use 409 pipe for structural applications?
Yes, it’s strong, formable, and cost-effective for load-bearing and framework where corrosion is not severe.

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