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Ensinger PEI

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AK Steel 441 Ferritic Stainless steel
Categories: Metal; Ferrous Metal; Stainless Steel

Material Notes: AK Steel 441 is a 17-18% by weight, chromium and columbium bearing ferritic stainless steel which provides good high-temperature strength (exceeding that of Types 409 and AK Steel 439 LT Stainless Steels) plus good corrosion resistance in many exhaust gas environments (equivalent to AK Steel 439 LT and 18 Cr-Cb Stainless Steels). Due to its finer, equiaxed grain structure, this alloy offers improved formability over standard AK Steel 18 Cr-Cb Stainless Steel.

Information provided by AK Steel.

Key Words: UNS S44100
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Mechanical PropertiesOriginal ValueComments
Hardness, Rockwell B 80Annealed
Tensile Strength, Ultimate 489 MPaAnnealed
 30.3 MPa
@Temperature 871 °C
 133 MPa
@Temperature 704 °C
 351 MPa
@Temperature 593 °C
Tensile Strength, Yield 2.90 MPa
@Temperature 871 °C
 14.4 MPa
@Temperature 704 °C
 23.1 MPa
@Temperature 593 °C
 326 MPa
@Strain 0.2 %
Annealed
Elongation at Break 35.9 %In 2", Annealed
Modulus of Rupture 0.0345 GPa
@Temperature 704 °C,
Time 360000 sec
 
Component Elements PropertiesOriginal ValueComments
Carbon, C 0.012 %
Chromium, Cr 18 %
Iron, Fe 80.694 %Balance
Manganese, Mn 0.30 %
Niobium, Nb (Columbium, Cb) 0.45 %
Phosphorus, P 0.023 %
Silicon, Si 0.35 %
Sulfur, S 0.0010 %
Titanium, Ti 0.17 %
 
Descriptive Properties
n Value (10% -Ult)0.207Annealed
Typical rm value1.31

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NAKS099a / 140771

Proto3000 – 3D Engineering Solutions

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