Steel Plate
309/309s Stainless Steels (UNS designation S30900/S30908) are austenitic, chromium-nickel
stainless steels that provide excellent corrosion resistance and heat resistance plus good strength
at room and elevated temperatures. Type 309s is the low carbon version of 309 which minimizes
carbide precipitation and improves weldability. These alloys are non-magnetic as annealed and
become slightly magnetic when cold worked.
These alloys exhibit excellent oxidation resistance, high-temperature strength and creep resistance.
APPLICATIONS
Furnace Parts
Heating Elements
Radiant Tubes
Inner Covers
Aircraft and Jet Engine Parts
Carburizing Annealing Boxes
Sulfite Liquor Handling Equipment
Kiln Liners
Boiler Baffles
Refinery and Chemical Processing Equipment
Auto Exhaust Parts
Fire Box Sheets
Radiant Tubes
Heat Exchangers
- Chemical Composition
| Grade | C | Si | P | S | Cr | Mn | Ni | Fe |
| 309 | 0.20 max | 1.0 max | 0.045 max | 0.030 max | 22.0 - 24.0 | 2.0 max | 12.0 - 15.0 | Remainder |
| 309S | 0.08 max | 1.0 max | 0.045 max | 0.030 max | 22.0 - 24.0 | 2.0 max | 12.0 - 15.0 | Remainder |
- Mechanical Properties
| Grade | Tensile Strength (ksi) | 0.2% Yield Strength (ksi) | Elongation% in 2 inches |
| 309 | 75 | 30 | 40 |
| 309S | 70 | 25 | 40 |
Corrosion resistance
309 and 309S provide excellent general corrosion resistance. They are more resistant to marine
atmospheres than Type 304. They exhibit high resistance to sulfite liquors and are useful for handling
nitric acid, nitric-sulfuric acid mixtures, and acetic, citric, and lactic acids.
These materials are generally considered heat-resisting alloys. Their destructive scaling
temperature is about 2000 °F (1093 °C). They exhibit good scaling resistance in both continuous and intermittent service, but the alloys should not be used above 1800 °F (982 °C) for intermittent service.
FAQ
Q. Can I have a sample order for stainless steel sheet plate products?
A: Yes, we welcome sample order to test and check quality. Mixed samples are acceptable.
Q. What about the lead time?
A:Sample needs 3-5 days;
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