Nichrome alloy wire for vacuum coating application
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CompareNickle chrome alloy description
NiCr 80: 20 Industrial furnaces (upto 1200° C), electric cooking equipment, precision resistors.
NiCr 70: 30 Industrial furnaces (upto 1230° C) with alternating oxidizing/reducing atmosphere, precision resistors.
NiCr 60: 15 Industrial furnaces (upto 1100° C), electrically heated equipment, high-resistance and potentiometer resistors.
NiCr 40: 20 Domestic heating appliances (upto 1050° C), furnaces in carburising or semi-reducing atmosphere.
NiCr 30: 20/ NiCr 20: 25 Industrial furnaces (upto 1050° C), heating elements of cooking equipment.
| Property | Cr15Ni60 | Cr20Ni80 | Cr20Ni30 |
| Main Chemical Composition(%) | 15-18 | 20-23 | 18-21 |
| 55-61 | Rest | 30-34 | |
| Rest | — | Rest | |
| Max continuous service Temp.of elements | 1100 | 1150 | 1100 |
| Density(g/cm3) | 8.2 | 8.4 | 7.9 |
| Melting point(approx ) | 1390 | 1400 | 1390 |
| Elongating(%) | 20 | 20 | 30 |
| Resistivity at 20 | 1.12-1.15±0.05 | 1.09-1.14±0.05 | 1.04-1.06±0.05 |
| Micrographic structure | Austenite A | Austenite A | Austenite A |
| Alloy | Ni% | Mn% | Fe% | Si% | Cr% | C% |
| NiCr 80:20 | Bal. | Max 1.0 | Max 1.0 | 1.00 – 1.50 | 19 – 21 | Max 0.10 |
| NiCr 70:30 | Bal. | Max 1.0 | Max 1.0 | 1.00 – 1.50 | 28 – 32 | Max 0.10 |
| NiCr 60:15 | Min 57.0 | Max 1.0 | Bal. | 1.00 – 1.50 | 14 – 17 | Max 0.10 |
| NiCr 40:20 | Min 37.0 | Max 1.0 | Bal. | 1.80 – 3.00 | 18 – 22 | Max 0.10 |
| NiCr 30:20 | Min 28.0 | Max 1.0 | Bal. | 1.80 – 3.00 | 18 – 22 | Max 0.10 |
| NiCr 20:25 | Min 18.0 | Max 1.0 | Bal. | 1.00 – 1.50 | 23 – 27 | Max 0.10 |
| Alloy | NiCr 80:20 | NiCr 70:30 | NiCr 60:15 | NiCr 40:20 | NiCr 30:20 | NiCr 20:25 |
| Tensile strength Min-Max (N/mm 2 ) |
700-900 | 800-950 | 700-850 | 700-850 | 650-800 | 600-800 |
| Elongation % (L 0 =100 mm) |
25-35 | 25-30 | 25-35 | 25-35 | 25-35 | 25-35 |
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