309/S Stainless Steel Sheet/Plate


1. Thickness:0.1mm - 80mm
Width:800mm - 2,000mm
Length:300mm - 12,000mm

2. Surface:2B/HL/NO.4/8K

3. Grades: Type 309/309S stainless steel

4. PVC film: Novacel(laser cutting)
Nitto(deep drawing)

5. Standard: UNS S30900/S30908

  • Types 309 and 309S 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 identical to Type 309 except for a lower carbon content that minimizes carbide precipitation and improves weldability. They are essentially non-magnetic as annealed and become slightly magnetic when cold worked.


    Grade C Mn Si P S Cr Ni Mo Cu Fe
    309 max:0.20 max:2.0 max:0.75 max:0.045 max:0.03 min:22.0
    0.75 0.5 balance
    309S min:0.04
    max:2.0 max:0.75max max:0.045 max:0.03 min:22.0
    0.75 0.5 balance


    Grade Tensile Strength
    ksi (min.)
    Yield Strength 0.2% ksi (min.) Elongation% Hardness (Brinell) MAX
    309/309S 40 30 40 217


    Density lbm/in3 Thermal Conductivity BTU/hr-ft-ºF Electrical Resistivity (in x 10-6) ModulusofElasticity
    (psi x 106)
    Coefficient of Thermal Expansion(in/in)/ºFx10-6 SpecificHeat(BTU/lb/ºF) MeltingRange(ºF)
    at 68ºF 32 - 212ºF 68ºF - 32 - 212ºF 68 - 212ºF 2500 − 2590
    0.285 9.0 30.7 28.5 8.28 0.1200 -


    • Heating elements
    • Aircraft and jet engine parts
    • Heat exchangers
    • Carburizing annealing products
    • Sulfite liquor handling equipment
    • Kiln liners
    • Bolier baffles
    • Refinery and chemical processing equipment
    • Auto exhaust parts

    • Corrosion Resistance
      Types 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.
    • Formability
      Types 309 and 309S stainless steels can be roll formed, stamped and drawn readily. In process annealing is sometimes required to reduce hardness and restore ductility. Type 309 is extremely stable and will remain nonmagnetic when cold worked. Its lower elongation makes this grade somewhat more difficult to form than other 300 series austenitic grades.
    • Weldability
      The austenitic class of stainless steels is generally considered to be weldable by the common fusion and resistance techniques. Special consideration is required to compensate for a higher coefficient of thermal expansion to avoid warping and distortion. Type 309 is generally considered to have weldability.
    • Heat Treatment
      These alloys are not hardenable by heat treatment.
      Annealing: Anneal at 1900 – 2050 °F (1038 – 1121 °C), then water quench or rapidly air cool.

    *Not all finishes are available in all alloys - (contact Yieh United Sales for more information)

    #1 Finish Hot rolled, annealed and pickled.
    #2D Finish A uniform, dull silver gray mill finish that is applied to thinner stainless steel coils,the thickness of which has been reduced by cold rolling.
    #2B Finish A semi polished surface achieved by finishing with the equivalent of a 80 to 120 grit abrasive. This finish has a pronounced grit line.
    #3 Finish A semi polished surface achieved by finishing with the equivalent of a 80 to 120 grit abrasive. This finish has a pronounced grit line.
    #4 Finish Also called brushed, directional or satin finish. A is characterized by fine polishing grit lines that are uniform and directional in appearance. The final abrasive used in the process is 150 to 220 grit.
    #4 Satin Brush Finish 150 to 180 grit finish A fine directional polish, typically used in the washroom accessories industry. Most 3.5″ floppy diskette cover plates have this finish.
    #6 Finish Polished finish achieved with the equivalent of a 240 grit abrasive. Finer grit lines and higher reflectivity than a No. 4 finish.
    #7 Finish Highly reflective surface obtained with the equivalent of a 320 grit abrasive. Minimal grit lines.
    No. 8 or True #8 mirror This is the most reflective mirror finish on the market. All of the polishing, or “grit,” lines from the preliminary polishing operations are removed. The look is that of a glass mirror. Sometimes referred to as a non directional mirror finish, Super 8, No. 9, Perfect No. 10, and even No. 12 mirror.
    CMP Super #8 mirror Chemical Mechanical Polished Super #8 mirror finished sheets are guaranteed to be free from any manufacturing defects. This product represents the ultimate in mirror polished stainless steel. It is available as a single-sided or double-sided mirror polished sheet.
    Hairline finish 80 – 140 grit finish A well defined directional polish. Starting base substrate is a No. 4 finish sheet; these sheets are polished to provide a “continuous long grain” hairline look. A finish which is popular with architects for its aesthetic, it is equally popular with fabricators due to it’s ease of fabrication and finish matching properties after welding operations.

    At Yieh United Corporation, we never stop improving and developing our technologies to go beyond our customer’s expectations. We strive towards these goals to produce reliable products and ensure they can be fully utilized throughout their lifetime.



    Our 309/S stainless steel products are packed and labeled according to the regulations and customers’ requests.

    stainless-steel-sheet-standardpackageNote: This is Yieh United Corporation’s standard seaworthy packing for 309/S stainless steel sheet sheet/plate.

    stainless-steel-sheet-special-packageNote: This is Yieh United Corporation’s special packing for 309/S stainless steel sheet/plate (Extra fee is needed).

  • FAQ

    1. What is the minimum order quantity (MOQ)?
    - Normally, the MOQ for our stainless steel sheet is 200 Kg. If we have any excess inventory of stainless steel sheet, there’s no MOQ requirement. You can ask us to check when you are interested in purchasing them.

    2.What is the payment method?
- For new customers: 30%T/T deposit 70%T/T Before shipment.
– For partners and distributors, 30%T/T deposit 70% T/T Against B/L Copy.

    3.What is the acceptable currency?
    - We accept USD, EUR and RMB.

    4.What is the delivery time?
- 5 days in advance.

    5.Where is the loading port?
    - Normally, our loading ports are Shanghai, Tianjin, and Shenzhen. You can choose anyone of them, or you can select the other ports.

    6.What is the delivery term?
    - FOB, CIF, CFR, EXW

    7.Do you offer free samples?
- Yes, based on our stock status, we will send our customer free samples. The express fee is to be paid by our customers.

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