What is Grade 309?
Stainless steels are often referred to as high-alloy steels. They have higher corrosion resistance than most steels due to the presence of significant concentrations of chromium in the range of 4 to 30%. Stainless steels are graded as martensitic, ferritic, or austenitic depending on their crystalline structure. Precipitation-hardened steels, on the other hand, are martensitic and austenitic stainless steels. The stainless steel type 309 is Austenitic Chromium nickel. Type 309 is used for parts that require corrosion, heat, and oxidation resistance up to 2000 degrees Fahrenheit. At high temperatures, the strength is comparable to that of 18-8 Stainless Steels.
What is the difference between Stainless Steel Grade 309 and 309S?
Grade 309S also includes Austenitic Chromium-Nickel Stainless steel, which is widely used for applications with higher temperatures. Alloy 309S is the Low Carbon variant of Stainless Steel Grade 309S. The only difference between the grades 309 and 309S of Stainless Steel is the content of carbon. This alloy has high tensile and creep capabilities at elevated temperatures, as well as excellent oxidation resistance. Alloy 309S contains much less carbon, which reduces carbide precipitation and improves weldability.
What is Stainless Steel Grade 309S Sheet?
Stainless Steel 309S Sheets is a lower carbon form of grade 309 that has good forming and welding properties. This Stainless Steel 309S Sheets can be welded conveniently using any resistance and fusion methods. Stainless Steel 309S Sheets are preferred for applications where sensitization and resulting corrosion by high-temperature gases or condensates during breakdown may be a concern.
Properties of 309S Sheets.
Some of the properties which are there in the Sheets is great Tensile Strength, High Toughness, Ductility, Durability, and Stability in the elevated temperatures.
Physical Properties
Density (lbm/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
