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309S Stainless Steel Sheet & Plate

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

309S stainless steel sheet and plate are specialized austenitic alloys designed to deliver outstanding performance in high-temperature and corrosive environments. With a unique composition that includes chromium (22-24%) and nickel (12-15%), this material is ideal for applications requiring excellent oxidation resistance and moderate mechanical strength at elevated temperatures. The “S” designation signifies the alloy’s improved machinability due to lower carbon content, making it a preferred choice for fabrication.

 

Key Features

  • High-Temperature Resistance: Capable of withstanding temperatures up to 1000°C (1832°F), 309S is ideal for thermal applications.
  • Corrosion Resistance: Excellent resistance to oxidation, scaling, and thermal fatigue in both air and mildly corrosive environments.
  • Machinability: The sulfur addition reduces tool wear and enhances machinability, allowing efficient production of complex parts.
  • Mechanical Properties: Strong tensile strength (~620 MPa) and good ductility ensure durability under mechanical stress.

 

Technical Specifications:

  • UNS Number: S30908
  • DIN/EN Designation: 1.4833

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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