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Elmet Technologies

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 PropertiesMetricEnglishComments
Density  6.95 g/cc
@Temperature 1230 °C
0.251 lb/in³
@Temperature 2250 °F
 7.00 g/cc
@Temperature 1090 °C
0.253 lb/in³
@Temperature 2000 °F
 7.05 g/cc
@Temperature 954 °C
0.255 lb/in³
@Temperature 1750 °F
 7.105 g/cc
@Temperature 816 °C
0.2567 lb/in³
@Temperature 1500 °F
 7.15 g/cc
@Temperature 677 °C
0.258 lb/in³
@Temperature 1250 °F
 7.195 g/cc
@Temperature 538 °C
0.2599 lb/in³
@Temperature 1000 °F
 7.24 g/cc
@Temperature 399 °C
0.262 lb/in³
@Temperature 750 °F
 7.285 g/cc
@Temperature 260 °C
0.2632 lb/in³
@Temperature 500 °F
 7.33 g/cc
@Temperature 121 °C
0.265 lb/in³
@Temperature 250 °F
 7.36 g/cc
@Temperature -17.8 °C
0.266 lb/in³
@Temperature 0.000 °F
 
Mechanical PropertiesMetricEnglishComments
Hardness, Rockwell B 8686
Tensile Strength, Ultimate 558 MPa80900 psiLongitudinal Orientation, True Stress/True Strain
 586 MPa85000 psiTransverse Orientation, True Stress/True Strain
Tensile Strength, Yield  421 MPa
@Strain 0.2 %
61100 psi
@Strain 0.2 %
Longitudinal Orientation, True Stress/True Strain
 448 MPa
@Strain 0.2 %
65000 psi
@Strain 0.2 %
Transverse Orientation, True Stress/True Strain
Elongation at Break 22 %22 %Transverse Orientation, In 2", True Stress/True Strain
 28 %28 %Longitudinal Orientation, In 2", True Stress/True Strain
Rupture Strength  3.70 MPa
@Temperature 871 °C,
Time 3.60e+6 sec
537 psi
@Temperature 1600 °F,
Time 1000 hour
Stress Rupture Strength
 6.30 MPa
@Temperature 871 °C,
Time 360000 sec
914 psi
@Temperature 1600 °F,
Time 100 hour
Stress Rupture Strength
 8.30 MPa
@Temperature 760 °C,
Time 3.60e+6 sec
1200 psi
@Temperature 1400 °F,
Time 1000 hour
Stress Rupture Strength
 15.9 MPa
@Temperature 760 °C,
Time 360000 sec
2310 psi
@Temperature 1400 °F,
Time 100 hour
Stress Rupture Strength
 31.0 MPa
@Temperature 649 °C,
Time 3.60e+6 sec
4500 psi
@Temperature 1200 °F,
Time 1000 hour
Stress Rupture Strength
 46.5 MPa
@Temperature 649 °C,
Time 360000 sec
6740 psi
@Temperature 1200 °F,
Time 100 hour
Stress Rupture Strength
 
Thermal PropertiesMetricEnglishComments
CTE, linear  17.6 µm/m-°C
@Temperature 100 °C
9.79 µin/in-°F
@Temperature 212 °F
 19.1 µm/m-°C
@Temperature 200 °C
10.6 µin/in-°F
@Temperature 392 °F
 20.2 µm/m-°C
@Temperature 300 °C
11.2 µin/in-°F
@Temperature 572 °F
 20.97 µm/m-°C
@Temperature 400 °C
11.65 µin/in-°F
@Temperature 752 °F
 21.69 µm/m-°C
@Temperature 500 °C
12.05 µin/in-°F
@Temperature 932 °F
 22.28 µm/m-°C
@Temperature 600.0 °C
12.38 µin/in-°F
@Temperature 1112 °F
 22.7 µm/m-°C
@Temperature 700.0 °C
12.6 µin/in-°F
@Temperature 1292 °F
 23.38 µm/m-°C
@Temperature 800.0 °C
12.99 µin/in-°F
@Temperature 1472 °F
 24.05 µm/m-°C
@Temperature 900.0 °C
13.36 µin/in-°F
@Temperature 1652 °F
 24.59 µm/m-°C
@Temperature 1000 °C
13.66 µin/in-°F
@Temperature 1832 °F
Thermal Conductivity  13.7 W/m-K
@Temperature 22.8 °C
95.1 BTU-in/hr-ft²-°F
@Temperature 73.0 °F
 14.2 W/m-K
@Temperature 50.0 °C
98.5 BTU-in/hr-ft²-°F
@Temperature 122 °F
 15.0 W/m-K
@Temperature 100 °C
104 BTU-in/hr-ft²-°F
@Temperature 212 °F
 16.6 W/m-K
@Temperature 200 °C
115 BTU-in/hr-ft²-°F
@Temperature 392 °F
 18.2 W/m-K
@Temperature 300 °C
126 BTU-in/hr-ft²-°F
@Temperature 572 °F
 19.8 W/m-K
@Temperature 400 °C
137 BTU-in/hr-ft²-°F
@Temperature 752 °F
 20.5 W/m-K
@Temperature 700.0 °C
142 BTU-in/hr-ft²-°F
@Temperature 1292 °F
 22.8 W/m-K
@Temperature 500 °C
158 BTU-in/hr-ft²-°F
@Temperature 932 °F
 24.0 W/m-K
@Temperature 800.0 °C
167 BTU-in/hr-ft²-°F
@Temperature 1472 °F
 24.8 W/m-K
@Temperature 900.0 °C
172 BTU-in/hr-ft²-°F
@Temperature 1652 °F
 25.1 W/m-K
@Temperature 600.0 °C
174 BTU-in/hr-ft²-°F
@Temperature 1112 °F
 26.2 W/m-K
@Temperature 1000 °C
182 BTU-in/hr-ft²-°F
@Temperature 1832 °F
 
Component Elements PropertiesMetricEnglishComments
Aluminum, Al 3.75 %3.75 %
Carbon, C 0.025 %0.025 %
Chromium, Cr 13 %13 %
Iron, Fe 82 - 82.375 %82 - 82.375 %Balance
Manganese, Mn 0.30 %0.30 %
Nickel, Ni 0.25 %0.25 %
Phosphorus, P <= 0.045 %<= 0.045 %
Sulfur, S <= 0.030 %<= 0.030 %
Titanium, Ti 0.30 %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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