Nichrome V (™Driver Harris Co), Tophet A (™Wilbur B Driver Co)


Application & Characteristics
Resists oxidation to 2100F. High electrical resistance at elevated temperatures in heating elements and cathode support sleeves.

Chemical Composition (%)
Ni 80.0; Cr 20.0

Physical Properties
Melting Range (°F)	2550
Density (lbs/in³) 68F	0.304
Thermal Expansion (in/in °Fx10 to the power of -6)	7.9 (70 – 500F)
Electrical Resistivity (ohms/cir mil/ft.) 68F	650

Mechanical Properties – Temper = A
Tensile Strength (psi x 10³)	100
Yield Strength (psi x 10³)	50
Elongation ( % )	45
Hardness	B80(Rockwell)

Mechanical Properties – Temper = H/2
Tensile Strength (psi x 10³)	120
Yield Strength (psi x 10³)	100
Elongation ( % )	20
Hardness	B95(Rockwell)

Mechanical Properties – Temper = H
Tensile Strength (psi x 10³)	150
Yield Strength (psi x 10³)	120
Elongation ( % )	5
Hardness	C25(Rockwell)