439 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 439 Stainless Steel

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

5.Standards: ASTM-A240/ASME-SA240

  • Type 439 stainless steel is a ferritic stainless steel that outperforms Type 409 in both oxidation resistance and corrosion resistance. Special attention to chemical composition combined with special processing give this alloy optimum formability that is reproducible, coil after coil and heat after heat. This provides special advantages when producing difficult-to-form exhaust systems componets.


    % C Mn Si Cr Ni Ti
    Type 439 0.025 max. 0.50 max. 0.75 max. 17.00 - 19.00 0.50 max. ≥0.20+4(C+N) min.
    0.50 max


    ksi (MPa)
    0.2% YS
    ksi (Mpa)
    Elongation % in 2''
    (50.8 mm)
    Hardness Rockwell
    32-36 B74-78


    • Hot Water Tank
    • Residential furnaces
    • Automotive Exhaust System Components



    • Corrosion Resistance
      Type 439 stainless steel exhibits better corrosion resistance in synthetic muffler condensate than Type 409.
    • Oxidation Resistance
      Type 439 stainless steel exhibits considerably better oxidation resistance than Type 409 at 1700ºF (927ºC) after 1022 hours of cyclic testing.
    • Formability
      Type 439 stainless steel shares the ferritic structure with Type 409 and carbon steels, and the mechanical behavior of these materials can be described in similar terms.
    • Weldability
      The ferritic class of stainless steels is generally considered to be weldable by the common fusion and resistance techniques. Special consideration is required to avoid brittle weld fractures during fabrication by minimizing discontinuities, maintaining low weld heat input, and occasionally warming the part some what before forming. This particular alloy is generally considered to have comparable weldability to the most common alloy of the stainless class, Type 409. A major difference is the lower carbon content. When a weld filler is needed, AWS E/ER 439 is most often specified, but W18Cb is suggested for high temperature service and E/ER 308L will develop better ductility if it will be used in ambient temperature conditions. Type 439 is well known in reference literature and more information can be obtained in this way.

    *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 439 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 439 stainless steel sheet sheet/plate.

    stainless-steel-sheet-special-packageNote: This is Yieh United Corporation’s special packing for 439 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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