Stainless Steel Type 409 Ultra Form®

(UNS S40920) in Coil Form

Type 409 Ultra Form® is a heat resisting ferritic stainless steel providing better oxidation and corrosion resistance compared to conventional Type 409 stainless steel. This grade also has enhanced formability compared to Type 409 stainless steel and can be used to fabricate more complex shapes. The corrosion resistance of Type 409 Ultra Form is better than coated carbon steel and Type 410 stainless steel, but less than that of Type 304/304L stainless steel.

Chemical Composition

Chemical Composition (wt%) limits as specified in ASTM A240 and ASME SA240*

Element 409 UF
Carbon 0.02
Chromium 10.5-11.7
Nickel 0.50
Manganese 0.75
Silicon 1.00
Nitrogen 0.030
Phosphorus 0.040
Sulfur 0.020
Titanium

8 x (C+N) min
0.15-0.50
* Maximum, unless range is indicated

Mechanical Properties

Mechanical property requirements for annealed product as specified in ASTM A240 and ASME SA240

Property 409 UF
Yield Strength, min. (ksi) 25
Tensile Strength, min. (ksi) 55
Elongation, min. (%) 20
Hardness, max. (Rb) 88
ULTRA FORM® is a registered trademark of AK Steel Corporation

Physical Properties

Physical properties for Type 409 Ultra Form® stainless steel

Property 409UF
Density, lb/in3 0.279
Modulus of Elasticity, psi 30.2 x 106
Coefficient of Thermal Expansion, 68-212˚F, /˚F 6.5 x 10-6
Thermal Conductivity, Btu/ft hr ˚F 13.2
Specific Heat, Btu/lb ˚F 0.11
Electrical Resistivity, Microohm-in 24.8

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Data are typical, are provided for informational purposes, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice. We make no representation or warranty as to its accuracy and assume no duty to update. Actual data on any particular product or material may vary from those shown herein.
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