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ATI Allegheny Ludlum Stainless Steel Ohmaloy® 40 Resistance Alloy

Category Metal , Electronic/Magnetic Alloy , Ferrous Metal
Manufacturer ATI Allegheny Ludlum
Trade Name
Port Ningbo port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF ATI Allegheny Ludlum Stainless Steel Ohmaloy® 40 Resistance Alloy.pdf
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Material Notes:
Ohmaloy 40 alloy is a moderately magnetic, ductile stainless steel having extremely high electrical resistivity. In addition to imparting high electrical resistivity, the aluminum content in these iron-13% chromium-aluminum resistance alloys also provides oxidation resistance. This alloy are capable of resisting oxidation for continuous duty at temperature up to 982 degrees Celsius, and is satisfactory for intermittent heating in temperatures form 982 to 1038 degrees Celsius. This alloy is used in many applications requiring dissipation of electrical energy. Some examples are grid resistors for mine locomotives, crane starters and, the largest application, braking resistors for railroad diesel locomotives. This alloy is used where the application demands heavy-duty resistors with a small volume-to-volume ratio. They can also be used in applications where resistance heating is required.Information provided by Allegheny Ludlum
Physical Properties Metric English Comments
Density 7.41 g/cc
0.268 lb/in³
Mechanical Properties Metric English Comments
Hardness, Rockwell B 88
88
Typical
Tensile Strength, Ultimate 600 MPa
87000 psi
Typical
Tensile Strength, Yield 448 MPa
65000 psi
Typical
Elongation at Break 23 %
23 %
typical in 2"
Thermal Properties Metric English Comments
CTE, linear 11.3 µm/m-°C

@Temperature 20.0 - 100 °C
6.28 µin/in-°F

@Temperature 68.0 - 212 °F
12.2 µm/m-°C

@Temperature 20.0 - 500 °C
6.78 µin/in-°F

@Temperature 68.0 - 932 °F
14.2 µm/m-°C

@Temperature 20.0 - 1000 °C
7.89 µin/in-°F

@Temperature 68.0 - 1830 °F
Thermal Conductivity 14.5 W/m-K

@Temperature 50.0 °C
101 BTU-in/hr-ft²-°F

@Temperature 122 °F
Component Elements Properties Metric English Comments
Aluminum, Al 3.95 %
3.95 %
Carbon, C 0.025 %
0.025 %
Chromium, Cr 13 %
13 %
Iron, Fe 82 %
82 %
as balance
Manganese, Mn 0.35 %
0.35 %
Silicon, Si 0.30 %
0.30 %
Titanium, Ti 0.30 %
0.30 %
Electrical Properties Metric English Comments
Electrical Resistivity 0.000116 ohm-cm
0.000116 ohm-cm
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