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Ensinger PEI

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AK Steel 13-4 SR® Ferritic Stainless Steel
Categories: Metal; Ferrous Metal; Stainless Steel
Material Notes: AK Steel 13-4 SR Stainless Steel is a ductile weldable ferritic with 13% Cr and 3.75% Al. The high aluminum content results in a base alloy with high electrical resistivity. It is intended for use where electrical energy needs to be dissipated or heat is generated. Good oxidation resistance to 1800°F (982°C) permits applications at elevated temperatures. The alloy’s wet corrosion resistance is comparable to ferritic alloys Type 409 or Type 430.

Information provided by AK Steel.
Key Words: Classified in ASTM B603 Class IV and as UNS K91470
Vendors: No vendors are listed for this material. Please click here if you are a supplier and would like information on how to add your listing to this material.
 
Physical PropertiesOriginal ValueComments
Density 6.95 g/cc
@Temperature 1230 °C
 7.00 g/cc
@Temperature 1090 °C
 7.05 g/cc
@Temperature 954 °C
 7.105 g/cc
@Temperature 816 °C
 7.15 g/cc
@Temperature 677 °C
 7.195 g/cc
@Temperature 538 °C
 7.24 g/cc
@Temperature 399 °C
 7.285 g/cc
@Temperature 260 °C
 7.33 g/cc
@Temperature 121 °C
 7.36 g/cc
@Temperature -17.8 °C
 
Mechanical PropertiesOriginal ValueComments
Hardness, Rockwell B 86
Tensile Strength, Ultimate 558 MPaLongitudinal Orientation, True Stress/True Strain
 586 MPaTransverse Orientation, True Stress/True Strain
Tensile Strength, Yield 421 MPa
@Strain 0.2 %		Longitudinal Orientation, True Stress/True Strain
 448 MPa
@Strain 0.2 %		Transverse Orientation, True Stress/True Strain
Elongation at Break 22 %Transverse Orientation, In 2", True Stress/True Strain
 28 %Longitudinal Orientation, In 2", True Stress/True Strain
Rupture Strength 3.70 MPa
@Temperature 871 °C,
Time 3.60e+6 sec		Stress Rupture Strength
 6.30 MPa
@Temperature 871 °C,
Time 360000 sec		Stress Rupture Strength
 8.30 MPa
@Temperature 760 °C,
Time 3.60e+6 sec		Stress Rupture Strength
 15.9 MPa
@Temperature 760 °C,
Time 360000 sec		Stress Rupture Strength
 31.0 MPa
@Temperature 649 °C,
Time 3.60e+6 sec		Stress Rupture Strength
 46.5 MPa
@Temperature 649 °C,
Time 360000 sec		Stress Rupture Strength
 
Thermal PropertiesOriginal ValueComments
CTE, linear 9.79 µin/in-°F
@Temperature 100 °C
 10.6 µin/in-°F
@Temperature 200 °C
 11.2 µin/in-°F
@Temperature 300 °C
 11.65 µin/in-°F
@Temperature 400 °C
 12.05 µin/in-°F
@Temperature 500 °C
 12.38 µin/in-°F
@Temperature 600.0 °C
 12.6 µin/in-°F
@Temperature 700.0 °C
 12.99 µin/in-°F
@Temperature 800.0 °C
 13.36 µin/in-°F
@Temperature 900.0 °C
 13.66 µin/in-°F
@Temperature 1000 °C
Thermal Conductivity 13.7 W/m-K
@Temperature 22.8 °C
 14.2 W/m-K
@Temperature 50.0 °C
 15.0 W/m-K
@Temperature 100 °C
 16.6 W/m-K
@Temperature 200 °C
 18.2 W/m-K
@Temperature 300 °C
 19.8 W/m-K
@Temperature 400 °C
 20.5 W/m-K
@Temperature 700.0 °C
 22.8 W/m-K
@Temperature 500 °C
 24.0 W/m-K
@Temperature 800.0 °C
 24.8 W/m-K
@Temperature 900.0 °C
 25.1 W/m-K
@Temperature 600.0 °C
 26.2 W/m-K
@Temperature 1000 °C
 
Component Elements PropertiesOriginal ValueComments
Aluminum, Al 3.75 %
Carbon, C 0.025 %
Chromium, Cr 13 %
Iron, Fe 82 - 82.375 %Balance
Manganese, Mn 0.30 %
Nickel, Ni 0.25 %
Phosphorus, P <= 0.045 %
Sulfur, S <= 0.030 %
Titanium, Ti 0.30 %
 
Descriptive Properties
100 Hour Still Air Oxidation Resistance, Weight Gain (mg/cm2)0.191600°F
 0.411800°F
 1.022000°F
 3.232200°F
Cyclic Oxidation Resistance 1550°-1600°F, Weight Change (mg/cm2)0.12100 cycles
 0.13200 cycles
 0.17300 cycles
 0.18400 cycles
 0.18500 cycles
n Value (10% -Ult)0.147Transverse Orientation,True Stress/True Strain
 0.167Longitudinal Orientation, True Stress/True Strain

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