1J85 Alloy Specification
High Permeability Nickel-Iron Alloy for Precision Applications
Product Specification
| Standard | GB/T 15018 (China), ASTM A753 (USA) |
| Material Designation | 1J85 (Fe-80Ni-5Mo) |
| Tolerance | h7-h11 (on request) |
| Melt Method | Vacuum Induction Melting (VIM) |
| Available Forms & Sizes | Rods:φ0.1mm-φ151mm × 5mm – 6000mm long |
Chemical Composition
| Element | Content (%) | Element | Content (%) |
| Nickel (Ni) | 79.0 – 81.0 | Molybdenum (Mo) | 4.8 – 5.2 |
| Iron (Fe) | Balance | Manganese (Mn) | ≤ 0.60 |
| Silicon (Si) | ≤ 0.30 | Carbon (C) | ≤ 0.03 |
| Phosphorus (P) | ≤ 0.02 | Sulfur (S) | ≤ 0.02 |
Description
1J85 is a high permeability nickel-iron soft magnetic alloy characterized by its exceptionally high magnetic permeability and low coercivity. This alloy is vacuum melted to achieve the high purity and precise composition required for sensitive electronic applications.
The designation 1J85 indicates an iron-based alloy containing approximately 80% nickel and 5% molybdenum. The “J” in Chinese material standards denotes precision alloys, while “85” refers to its initial permeability value (approximately 85,000).
Key Properties
- Initial Permeability: 30,000 – 100,000
- Maximum Permeability: 110,000 – 300,000
- Coercivity: 1.2 – 2.4 A/m
- Saturation Induction: 0.75 – 0.85 T
- Curie Temperature: 400-450°C
- Density: 8.75 g/cm³
Applications
- Magnetic shielding
- Transformer cores for sensitive instruments
- Magnetic amplifiers
- Chokes and inductors
- Telecommunication equipment
- Medical instruments
Document generated on 2025/10/21 | For reference purposes only
