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309S Stainless Steel Sheet & Plate

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309S Stainless Steel Sheet & Plate (UNS S30908,1.4833)

At DNYA Stainless Steel, pleased to offer premium 309S Stainless Steel Sheets & Plates, and plates that are engineered to provide exceptional weldability, high-temperature strength, and oxidation resistance.

 

Whether you’re sourcing for furnace components, heat exchangers, exhaust systems, or chemical processing equipment, 309S provides the strength and thermal resistance you need without compromising on corrosion protection.

 

What is 309S Stainless Steel?

309S stainless steel is an austenitic chromium-nickel alloy with a low carbon content (≤0.08%), developed to provide excellent oxidation resistance and high-temperature strength while minimizing carbide precipitation during welding. It is the preferred version of 309 stainless steel in applications where welding is required and post-weld heat treatment is not feasible.

Combining heat resistance, corrosion protection, and reliable weldability, 309S is ideal for industries such as petrochemical processing, thermal power, furnaces, incinerators, and chemical handling systems.

 

Key Features 

  • Excellent High-Temperature Oxidation Resistance
    Resists scaling in continuous service up to 1000°C (1832°F).

  • Low Carbon for Enhanced Weldability
    Prevents intergranular corrosion after welding.

  • Superior Resistance to Thermal Fatigue
    Performs well under cyclic heating and cooling conditions.

  • High Strength and Ductility
    Maintains mechanical integrity at elevated temperatures.

  • Good Formability and Workability
    Can be cut, rolled, and formed with conventional tools.

  • Compliant with ASTM A240 / ASME SA240
    Suitable for pressure vessels and industrial fabrication.

Available Thickness

3/16″1/4″5/16″3/8″1/2″5/8″3/4″1″
4.8mm6.3mm7.9mm9.5mm12.7mm15.9mm19mm25.4mm
1 1/4″1 1/2″1 5/8″1 3/4″2″2 1/2″3″
31.8mm38.1mm41.3mm44.5mm50.8mm63.5mm76.2mm
309s-stainless-steel-sheet-plate

Application

  • Automotive
  • Chemical and Pharmaceutical
  • Fertilizer
  • Food Processing and Handling
  • Manufacturing
  • Mining
  • Oil & Gas
  • Phosphate Mining

Standard

  • ASTM A240 / A240M
  • ASTM A276 / A276M
  • ASTM A312 / A312M
  • ISO 15510
  • EN 10088-2
  • IN 10204
  • HE G4304
  • HE G4305
  • ASME SA240 / SA240M
  • ASME SA312 / SA312M

Corrosion Resistance

  • High-Temperature Resistance: 309S excels in resisting oxidation and corrosion at high temperatures, making it suitable for applications involving prolonged exposure to temperatures up to around 2000°F (1093°C). This makes it ideal for furnace parts, heat exchangers, and other high-temperature applications.
  • General Corrosion: While it offers good general corrosion resistance, it is not as resistant as 316L in chloride environments. Thus, for highly corrosive environments like marine applications or where there’s significant exposure to chlorides, 316L might be a better choice.
  • Oxidation: The high chromium content provides excellent resistance to oxidation and helps maintain its integrity in high-temperature oxidation environments.

Worldwide Equivalent Grade 309S

Country
Standard
Grade
USA
ASTM
309S
Germany
DIN
X8CrNi25-21 (1.4833)
Japan 
JIS
SUS 309S
UK 
BS
309S (1.4833)
China 
GB
0Cr23Ni13 (309S)
France
AFNOR
Z15CN24-13

Chemical Composition for Stainless Steel Plate 309S

ElementRange (%)
Carbon (C)≤ 0.08
Manganese (Mn)2.00 – 4.00
Silicon (Si)1.00 – 1.50
Chromium (Cr)22.00 – 24.00
Nickel (Ni)12.00 – 15.00
Phosphorus (P)≤ 0.045
Sulfur (S)≤ 0.030
Nitrogen (N)≤ 0.10

Physical Properties for Stainless Steel Plate 309S

PropertyValue
Density8.03 g/cm³
Melting Point1400-1450°C (2552-2642°F)
Modulus of Elasticity193-200 GPa (28-29 x 10^6 psi)
Poisson’s Ratio0.27 – 0.30
Thermal Conductivity16.2 W/m·K (112 BTU/hr·ft·°F)
Specific Heat Capacity500 J/kg·K (0.12 BTU/lb·°F)
Electrical Resistivity0.72 µΩ·cm

Mechanical Properties for Stainless Steel Plate 309S

Property Value
Yield Strength (0.2% offset) ~205 MPa
Tensile Strength ~515 MPa
Elongation (in 50 mm) ~40%
Hardness (Rockwell B) ~80 HB
Modulus of Elasticity ~200 GPa
Poisson’s Ratio ~0.30

Fabrication Data

  • Welding: 309S can be welded using conventional methods like TIG (Tungsten Inert Gas) and MIG (Metal Inert Gas) welding. Pre-heating and post-weld heat treatment are generally not required, but proper joint design and cleanliness are crucial.
  • Machining: It machines well with standard tooling, though its toughness can cause tool wear. Use sharp tools and proper cutting speeds.
  • Forming: It has good ductility for forming operations, but high temperatures during forming can improve workability.
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For more information or to request a quote, contact us today to discuss how Stainless Steel Plate 304H can meet your specific project needs.