Austenitic 309S （S30908）stainless steel plate/coil

Austenitic 309S （S30908）stainless steel plate/coil

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Description

Chemical Composition and Mechanical Properties of 309S Stainless Steel

309S (S30908) is a low-carbon version of 309 stainless steel with the following composition:

Element Percentage
Carbon (max) 0.08
Chromium 22.0 – 24.0
Nickel 12.0 – 15.0
Manganese (max) 2.00
Silicon (max) 0.75
Phosphorus (max) 0.045
Sulfur (max) 0.030

Mechanical Properties:

Property Value
Tensile Strength (min) 515 MPa (75 ksi)
Yield Strength (min) 205 MPa (30 ksi)
Elongation (min) 40%
Hardness (max) 159 Brinell

Applications and Industries Using 309S Stainless Steel

309S stainless steel is widely used in:

  1. Heat treatment furnaces and equipment
  2. Chemical processing plants
  3. Petroleum refining catalytic recovery systems
  4. Pulp and paper mill equipment
  5. Aircraft and jet engine parts
  6. Automotive exhaust systems
  7. Food processing equipment

High-Temperature Performance and Corrosion Resistance

309S offers excellent oxidation resistance up to 1900°F (1038°C) under non-cyclic conditions. It maintains stability at temperatures as high as 980°C, making it essential for industrial environments.

The alloy also provides:

  • High resistance to sulfur-containing atmospheres up to 1832°F (1000°C)
  • Good resistance to marine atmospheres
  • Excellent resistance to nitric, citric, and lactic acids

Manufacturing Process and Available Forms

309S is typically produced through controlled rolling processes. Available forms include:

  • Plates
  • Coils
  • Sheets
  • Strips

Welding and Fabrication Considerations

309S has excellent weldability due to its low carbon content, which minimizes carbide precipitation. It can be welded using standard fusion and resistance welding methods. When a weld filler is needed, AWS E/ER 309 and 310 are most often specified.

Comparison of 309S with Other Austenitic Stainless Steel Grades

309S offers superior high-temperature performance compared to common grades like 304:

Grade Max Continuous Service Temperature
309S 2000°F (1093°C)
304 1600°F (871°C)

At HL Steel Company, we provide high-quality 309S (S30908) stainless steel plates and coils, ensuring optimal performance for your high-temperature and corrosion-resistant applications.

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