Nominal Composition
|
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.
Typical Mechanical Properties
| 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 |
|
|
Typical Physical Properties
| 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 |
|
|
Forms
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
Standard Dimension and Tolerances
page for general size ranges of products. If you do not see your required
size list contact us via
email or phone for further information or assistance. |
