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High Resistivity Karm Wire 6J22 for Precision Resistors
- Product Details
🔹 Product Name:
6J22 High Resistivity Karm Wire
(Also referred to as Karmalloy 6J22 or Fe-Ni-Cr-Al high-resistivity alloy)
🔹 Chemical Composition (Typical, wt%)
| Element | Content (%) |
|---|---|
| Fe | Balance |
| Ni | ~22% |
| Cr | ~3% |
| Al | ~0.3% |
| Mn | ~0.5% |
| Si | ≤ 0.5% |
| C, P, S | Trace |
6J22 is part of the iron-nickel alloy family, similar in class to other Karmalloy or Constantan-type resistance wires, but with higher resistivity and better thermal stability.
🔹 Key Physical Properties
| Property | Value |
|---|---|
| Electrical Resistivity | ~1.35 μΩ·m (135 μΩ·cm) |
| Density | ~8.1 g/cm³ |
| Melting Point | ~1420–1450 °C |
| Operating Temp. | Up to ~500 °C (air) |
| Temperature Coefficient of Resistance (TCR) | Low (stable across range) |
| Magnetism | Non-magnetic (soft magnetic in bulk) |
🔹 Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Tensile Strength | ~400–600 MPa |
| Elongation | ~25–35% |
| Hardness | ~HV 120–160 |
🔹 Key Features
✅ High and stable electrical resistivity
✅ Excellent uniformity for precision resistors
✅ Good oxidation resistance at moderate temperatures
✅ Low temperature coefficient of resistance
✅ Non-magnetic, suitable for sensitive electrical environments
🔹 Typical Applications
Precision wire-wound resistors
Shunt resistors
Electrical heating elements (for low-mid temp range)
Thermocouple compensation wire (in some systems)
Sensor components in measurement circuits
🔹 Available Forms
Fine wire (diameter from 0.02 mm and up)
Strips or ribbon
Rod or bar (for machining or sputtering targets)
If you’re considering using 6J22 wire in a product, I can help you with:
Matching alternatives (e.g., Constantan, Manganin)
Recommended annealing temperatures
Supplier/export specs (China or international)
Let me know your intended application or needed specifications (wire size, resistance per meter, etc.) — I can help you optimize or select the right grade.
