JIS G4304 or JIS G4305 Austenitic SUS309S stainless steel plate/coil

JIS G4304 or JIS G4305 Austenitic SUS309S stainless steel plate/coil

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Description

Chemical Composition and Mechanical Properties of SUS309S Stainless Steel

SUS309S is an austenitic stainless steel with the following composition and properties:

Element Percentage
Chromium 22.0-24.0%
Nickel 12.0-15.0%
Carbon 0.08% max
Manganese 2.00% max
Silicon 0.75% max
Phosphorus 0.045% max
Sulfur 0.030% max

Mechanical Properties:

Property Value
Tensile Strength 620 MPa (min)
Yield Strength 310 MPa (min)
Elongation 40% (min)

Applications and Industries Using SUS309S

SUS309S is widely used in high-temperature applications:

  1. Furnaces and heat treatment equipment
  2. Petroleum refining catalytic recovery systems
  3. Fluidized bed furnaces
  4. Power generation equipment
  5. Waste treatment incinerators
  6. Paper mill equipment

Manufacturing Process of SUS309S Stainless Steel

The manufacturing process of SUS309S typically involves:

  1. Melting raw materials in an electric furnace
  2. Refining the molten metal using AOD or VOD processes
  3. Continuous casting into slabs
  4. Hot rolling to reduce thickness
  5. Cold rolling to achieve final dimensions
  6. Solution annealing at 1100-1150°C followed by rapid cooling

Comparison of SUS309S with Other Stainless Steel Grades

Grade Carbon Content Oxidation Resistance Weldability
SUS309S 0.08% max Up to 1038°C Excellent
SUS309 0.20% max Up to 1038°C Good
SUS310S 0.08% max Up to 1150°C Excellent

SUS309S offers improved weldability compared to regular SUS309 due to its lower carbon content.

Corrosion Resistance and Heat Treatment of SUS309S

SUS309S exhibits excellent corrosion resistance in high-temperature environments:

  • Resists oxidation up to 1038°C under non-cyclic conditions
  • Suitable for sulfur-containing atmospheres up to 1000°C
  • Not recommended for highly carburizing atmospheres

Heat treatment:

  • Solution annealing: 1100-1150°C, followed by rapid cooling
  • Avoid prolonged exposure to 650-950°C to prevent sigma phase formation

At HL Steel Company, we offer high-quality SUS309S stainless steel products tailored to meet your specific industrial needs, ensuring superior performance in high-temperature applications.

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