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Stainless Steel 309S Sheets Properties and Applications

What is Grade 309?

High-alloy steels are a term used to describe stainless steel. Due to the presence of considerable chromium concentrations in the range of 4 to 30%, they have stronger corrosion resistance than other steels. Based on its crystalline structure, stainless steel is classified as martensitic, ferritic, or austenitic.

Martensitic and austenitic stainless steels, on the other hand, are precipitation-hardened steels. Austenitic Chromium-Nickel stainless steel type 309 Parts that need corrosion, heat and oxidation resistance up to 2000 degrees Fahrenheit are made of Type 309. The strength is equivalent to 18-8 Stainless Steel at high temperatures.

What is the difference between Stainless Steel Grade 309 and 309S?

Austenitic Chromium-Nickel Stainless Steel (Grade 309S) is a kind of stainless steel that is commonly used in high-temperature applications. The Low Carbon version of Stainless Steel Grade 309S is Alloy 309S. The sole difference between Stainless Steel grades 309 and 309S is the carbon content. At high temperatures, this alloy possesses outstanding tensile and creep properties, as well as great oxidation resistance. Because Alloy 309S has a lower carbon content, carbide precipitation is reduced and weldability is improved.

What is Stainless Steel Grade 309S Sheet?

Stainless Steel 309S Sheets are a lower carbon version of grade 309 with excellent forming and welding capabilities. Any resistance and fusion procedures can be used to weld these Stainless Steel 309S Sheets. Stainless Steel 309S Sheets are recommended for situations where high-temperature gases or condensates may cause sensitization and subsequent corrosion.

Properties of 309S Sheets

Alloy 309 may be used in sulfur-containing atmospheres up to 1832°F (1000°C) due to its high chromium and low nickel content. Because of its modest resistance to carbon absorption, the alloy is not recommended for use in severely carburizing environments. Although somewhat oxidizing, nitriding, cementing, and thermal cycling applications are possible with Alloy 309, the maximum service temperature must be decreased.

Great Tensile Strength, High Toughness, Ductility, Durability, and Stability at High Temperatures are among the qualities found in the Sheets.

Physical Properties

  • Density (lbs/in^3): 68°F: 0.285
  • Thermal Conductivity (BTU/h ft. °F): 9.0 at 32- 212°F
  • Electrical Resistivity (in x 10^-6): 30.7 at 68°F
  • Modulus of Elasticity (psi x 10^6): 28.5
  • Coefficient of Thermal Expansion (in/in)/ °F x 10^-6: 8.28 at 32 – 212°F
  • Specific Heat (BTU/lb/°F): 0.1200 at 68°F to 212°F
  • Melting Range (°F): 2500-2590

These SS 309S Sheets can be used for various applications like:

  • Furnace Components
  • Oven Linings
  • Boiler Baffles
  • Fire Box Sheets
  • Heating elements
  • Other High-Temperature Containers
  • Kiln liners
  • Heat exchangers
  • Aircraft
  • Refinery and chemical processing equipment
  • Auto exhaust parts

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