OHMALOY 30 and OHMALOY 40 Steel

OHMALOY 30 and OHMALOY 40 Steel

Steel name: OHMALOY 30 and OHMALOY 40
Diagram No.: 2250
Chemical composition in weight %:
OHMALOY 30: 0.025% C, 0.30% Si, 0.35% Mn, 13.00% Cr, 3.00% Al, 0.30% Ti
OHMALOY 40: 0.025% C, 0.30% Si, 0.35% Mn, 13.00% Cr, 3.95% Al, 0.30% Ti
Steel group: Stainless steels
Properties: Ohmaloy 30 and Ohmaloy 40 alloys are moderately magnetic, ductile stainless steels 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. These alloys are capable of resisting oxidation for continuous duty at temperatures up to 1800°F (982°C), and are satisfactory for intermittent heating in temperatures from 1800°F (982°C) to 1900°F (1038°C). These Ohmaloy resistance alloy are classified as UNS K91470 and K91670. These are covered in ASTM B603 as Types IV and III, respectively.
Applications: Ohmaloy 30 and Ohmaloy 40 alloys are 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. These alloys are used where the application demands heavy-duty resistors with a small surface-to-volume ratio. They can also be used in applications where resistance heating is required.
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Heat Treatment
Ohmaloy 30 and 40 alloys can be hardened only by cold work. During the fabrication process, it may be necessary to restore the annealed properties after cold work. The alloys are annealed using temperatures from 1600-1650°F (871-899°C) for one hour per inch of thickness followed by air cooling.

Typical Elevated Temperature Tensile Properties

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