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  • 409 Stainless Steel

    409 Stainless Steel

    Type 409 Stainless Steel is covered by the following specifications:ASTM A240/A240M.

    Chemical Composition:

    Element UNS S40910 UNS S40920 UNS S40930
    Carbon 0.030 max. 0.030 max. 0.030 max
    Manganese 1.00 max. 1.00 max. 1.00 max.
    Sulfur 0.020 max. 0.020 max 0.020 max
    Phosphorus 0.040 max. 0.040 max. 0.040 max.
    Silicon 1.00 max. 1.00 max. 1.00 max.
    Chromium 10.5 – 11.7 10.5 – 11.7 10.5 – 11.7
    Nickel 0.50 max. 0.50 max. 0.50 max.
    Nitrogen 0.030 max. 0.030 max. 0.030 max.
    Titanium 6x(C+N) min. – 0.50 max. 8X(C+N)min. / 0.15 – 0.50 0.05 min.
    Niobium 0.17 max. 0.10 max.  
    Ti + Nb     [0.08+8x(C+N)] min. – 0.75 max.

    Mechanical Properties:

    Type Yield Strength 0.2% offset (KSI) Tensile Strength (KSI) % Elongation (2" Gauge length) Hardness Rockwell
    S40910 25 min. 55 min 20 min. HRB 88 max.
    S40920 25 min. 55 min. 20 min. HRB 88 max.
    S40930 25 min. 55 min. 20 min. HRB 88 max.


    Fabrication

    409 Stainless Steels provide good fabricating characteristics and can be cut, blanked and formed without difficulty. These steels provide fabricating characteristics that are much improved when compared to standard ASTM A240 Type 409 stainless steel. Brakes and presses used normally on carbon steel can be used on 409 Stainless Steels.

    Welding
    409 stainless is readily welded by arc welding processes. When gauge thickness and weld joint geometry permit the use of gas shielded metal-arc welding, joints having good properties are easily obtained. The electrode wires most often suggested are AWS ER309 or ER308L austenitic stainless steel when the application does not include exposure to high temperatures. AWS ER309 or ER308L stainless wire may also be employed for joining these stainless steels to mild steel. Thin wall components for elevated-temperature service should be weld fabricated with a matching weld filler such as 409 Cb. AWS ER430 and W18 Cr-Cb filler wires are suitable alternatives.


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