Nichrome/Tophet “A”
| Carbon | 15% Max | ||
| Manganese | 5% Max | ||
| Sulfur | 0.1% Max | ||
| Silicon | 0.5-1.5% Max | ||
| Chromium | 19-21% | ||
| Nickel (+Cobalt) | 77-79% | ||
| Iron | 1.0% Max |
Nichrome/Tophet “A” is a nickel-chromium resistance alloy for operating temperatures up to 2150° F. It is non-magnetic, highly corrosion resistant and has a lower coefficient of resistance than other heater element alloys. Typical Applications for the material include flat irons, ironing machines, quartz tube heaters, cartridge elements, etc. The lack of reactivity to MgO refractories make it the most suitable alloy for enclosed heater elements especially in higher temperature ranges.
| Ultimate Tensile Strength: | ||
| Hard Temper | 200,000 PSI | |
| Stress Relieved | 175,000 PSI | |
| Annealed | 100,000 PSI | |
| Modulus of Elasticity (x 10e6 PSI) |
31 | |
| Magnetic Response | Non-magnetic |
| Density | .304 lbs/cu in | |
| Melting Point | 2552° F Approximately | |
| Specific Gravity | 8.41 | |
| Electrical Resistivity @ RT | 650 ohm/cir mil/ft | |
| Thermal Expansion Coefficient | ||
| 70-200°F | 7.3 x 10-e6 | |
| 201-1500°F | 9.6 x 10-e6 | |
| Thermal Conductivity | 0.113 W/cm/°C |
H. Cross Company can provide Nichrome/Tophet “A” in wire, ribbon, strip, sheet and foil sizes to suit your particular needs. Please refer to our Typical Dimension and Tolerances page for general size ranges of products. If you do not see your required size list Contact Us by or email phone for further information or assistance.