AK Steel 409 ULTRA FORM® Stainless Steel

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AK Steel 409 ULTRA FORM® Stainless Steel
Categories:	Metal; Ferrous Metal; Stainless Steel
Material Notes:	AK Steel 409 ULTRA FORM Stainless Steel provides an outstanding combination of improved forming and welding characteristics, while providing superior resistance to oxidation, corrosion, ridging and roping in both automotive exhaust and non-exhaust applications. These benefits are achieved through precise control of chemistry and thermo-mechanical processing from melting to finishing. AK Steel 409 ULTRA FORM is essentially non-hardenable by heat treatment because of its titanium and low-carbon levels. The titanium additions not only stabilize the steel to prevent hardening during welding, but also prevent the formation of harmful chromium carbides which can lead to intergranular corrosion in service. Available Forms AK Steel produces 409 ULTRA FORM Stainless Steel coils and cut lengths in thicknesses of 0.015" to 0.250" (0.381 to 6.350 mm) in widths up to and including 48" (1219 mm). For applications over 0.120" (3.048mm) thick, AK Steel 409 Ni Stainless Steel will provide improved toughness and weldability. The surface finish of the alloy is obtained by annealing and pickling after rolling. The pickled surface is relatively dull and, like other titanium-stabilized stainless steels, may have cosmetic titanium streaks and will appear similar to typical Type 409. Information provided by AK Steel.
Key Words:	UNS S40920
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Physical Properties	Original Value	Comments

Density	7.74 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Rockwell B	66.9	Annealed
	70	5% Cold Worked
	85.3	10% Cold Worked
	85.3	50% Cold Worked
	88.7	15% Cold Worked
	93.5	30% Cold Worked
	64 - 70 @Thickness 1.27 - 2.16 mm	Annealed, Transverse Orientation
Tensile Strength, Ultimate	434 MPa	5% Cold Worked
	490 MPa	10% Cold Worked
	545 MPa	15% Cold Worked
	657 MPa	30% Cold Worked
	730 MPa	50% Cold Worked
	32.0 MPa @Temperature 816 °C
	73.0 MPa @Temperature 704 °C
	145 MPa @Temperature 649 °C
	246 MPa @Temperature 538 °C
	320 MPa @Temperature 371 °C
	340 MPa @Temperature 204 °C
	418 MPa @Temperature 22.2 °C
	379 - 455 MPa @Thickness 1.27 - 2.16 mm	Annealed, Transverse Orientation
Tensile Strength, Yield	186 - 262 MPa @Strain 0.2 %	Annealed, Transverse Orientation, 0.05"-0.085"
	352 MPa @Strain 0.2 %	5% Cold Worked
	486 MPa @Strain 0.2 %	10% Cold Worked
	541 MPa @Strain 0.2 %	15% Cold Worked
	652 MPa @Strain 0.2 %	30% Cold Worked
	721 MPa @Strain 0.2 %	50% Cold Worked
	22.0 MPa @Strain 0.2 %, Temperature 816 °C
	47.0 MPa @Strain 0.2 %, Temperature 704 °C
	89.0 MPa @Strain 0.2 %, Temperature 649 °C
	127 MPa @Strain 0.2 %, Temperature 538 °C
	152 MPa @Strain 0.2 %, Temperature 371 °C
	154 MPa @Strain 0.2 %, Temperature 204 °C
	225 MPa @Strain 0.2 %, Temperature 22.2 °C
Elongation at Break	3.5 %	50% Cold Worked, in 2"
	4.0 %	30% Cold Worked, in 2"
	9.5 %	15% Cold Worked, in 2"
	17 %	10% Cold Worked, in 2"
	31.9 %	5% Cold Worked, in 2"
	36.3 %	Annealed, in 2"
	33 - 43 % @Thickness 1.27 - 2.16 mm	Annealed, Transverse Orientation
Tensile Modulus	208 GPa
Fatigue Strength	10.0 MPa @# of Cycles 1.00e+7 , Temperature 816 °C	r=0.1
	34.0 MPa @# of Cycles 1.00e+7 , Temperature 704 °C	r=0.1

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000600 ohm-cm

Component Elements Properties	Original Value	Comments
Carbon, C	<= 0.020 %	Ti, min. = 8X(C+N)
Chromium, Cr	10.5 - 11.7 %
Iron, Fe	86 - 89.5 %	as balance
Manganese, Mn	<= 0.75 %
Nickel, Ni	<= 0.50 %
Phosphorus, P	<= 0.040 %
Silicon, Si	<= 1.0 %
Sulfur, S	<= 0.010 %

Descriptive Properties
Typical r_m value	1.5	0.050"-0.085", Annealed, Transverse Orientation

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NAKS143 / 140767

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