AK Steel 439 ULTRA FORM® Stainless Steel

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AK Steel 439 ULTRA FORM® Stainless Steel
Categories:	Metal; Ferrous Metal; Stainless Steel
Material Notes:	AK Steel 439 ULTRA FORM™ was developed for applications requiring oxidation and corrosion resistance superior to Type 409 as well as superior formability to AK Steel 439 Stainless Steel. As a result, the material offers advantages for parts requiring more complex shapes than possible from these stainless steels. Examples include tubular manifolds and other exhaust system components where temperatures may exceed the oxidation limit of Type 409, or where wet corrosion resistance, particularly to chlorides, is needed. Information provided by AK Steel.
Key Words:	UNS S43035
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Physical Properties	Original Value	Comments

Density	7.685 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Rockwell B	72.9	Annealed
	74	Annealed, Transverse Orientation
	85.4	5% Cold Worked
	89.1	10% Cold Worked
	92.1	15% Cold Worked
	95.6	30% Cold Worked
	96.9	50% Cold Worked
Tensile Strength, Ultimate	438 MPa	Annealed
	484 MPa	5% Cold Worked
	546 MPa	10% Cold Worked
	618 MPa	15% Cold Worked
	713 MPa	30% Cold Worked
	785 MPa	50% Cold Worked
	35.0 MPa @Temperature 816 °C
	70.0 MPa @Temperature 704 °C
	225 MPa @Temperature 593 °C
	373 MPa @Temperature 371 °C
	404 MPa @Temperature 204 °C
	462 MPa @Temperature 23.9 °C	Annealed, Transverse Orientation
Tensile Strength, Yield	263 MPa @Strain 0.2 %	Annealed
	460 MPa @Strain 0.2 %	5% Cold Worked
	544 MPa @Strain 0.2 %	10% Cold Worked
	613 MPa @Strain 0.2 %	15% Cold Worked
	680 MPa @Strain 0.2 %	30% Cold Worked
	753 MPa @Strain 0.2 %	50% Cold Worked
	25.0 MPa @Strain 0.2 %, Temperature 816 °C
	49.0 MPa @Strain 0.2 %, Temperature 704 °C
	130 MPa @Strain 0.2 %, Temperature 593 °C
	191 MPa @Strain 0.2 %, Temperature 371 °C
	206 MPa @Strain 0.2 %, Temperature 204 °C
	283 MPa @Strain 0.2 %, Temperature 21.1 °C	Annealed, Transverse Orientation
Elongation at Break	2.8 %	In 2", 50% Cold Worked
	3.8 %	In 2", 30% Cold Worked
	6.5 %	In 2", 15% Cold Worked
	12 %	In 2", 10% Cold Worked
	24.3 %	In 2", 5% Cold Worked
	34.8 %	In 2", Annealed
	35 %	In 2", Annealed, Transverse Orientation
Fatigue Strength	10.0 MPa @# of Cycles 1.00e+7 , Temperature 816 °C	r=0.1
	28.0 MPa @# of Cycles 1.00e+7 , Temperature 704 °C	r=0.1

Component Elements Properties	Original Value	Comments
Carbon, C	0.010 %
Chromium, Cr	17.35 %
Iron, Fe	81.3535 %	Balance
Manganese, Mn	0.25 %
Molybdenum, Mo	0.10 %
Nickel, Ni	0.20 %
Niobium, Nb (Columbium, Cb)	0.020 %
Nitrogen, N	0.010 %
Phosphorus, P	0.020 %
Silicon, Si	0.35 %
Sulfur, S	0.0015 %
Titanium, Ti	0.335 %

Descriptive Properties
Olsen Cup Height (in)	0.33	0.022"-0.028"
	0.342	0.030"
	0.371	0.035"
	0.408	0.056"-0.059"
Typical r_m value	1.62	0.056"-0.059"
	1.78	0.035"
	1.96	0.022"-0.028"
	2.03	0.030"

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NAKS145 / 140769

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