Standard: GBN198-1988
Magnetic alloys, including Grades 1J46, 1J50, 1J79, and 1J85, are specialized materials known for their high magnetic permeability, low coercivity, and excellent performance in electromagnetic applications. These alloys are essential for precision engineering where magnetic properties are critical, such as in transformers, magnetic shielding, and various high-sensitivity electromagnetic components.
Applications
These alloys are ideal for applications that require:
Magnetic Components: Ensuring high permeability and precise magnetization control.
Transformers: Minimizing energy loss with low coercivity.
Magnetic Shields: Providing effective magnetic shielding for sensitive electronic devices.
Electromagnetic Instruments: Delivering consistent performance in instruments with high-sensitivity magnetic requirements.
Chemical Composition
The table below highlights the main chemical composition of each grade:
Grade | C (%) | P (%) | S (%) | Mn (%) | Si (%) | Ni (%) | Cr | Co | Mo (%) | Cu (%) | Fe |
1J46 | ≤0.03 | ≤0.02 | ≤0.02 | 0.6-1.1 | 0.15-0.30 | 45.0-46.5 | - | - | - | ≤0.2 | Bal |
1J50 | ≤0.03 | ≤0.02 | ≤0.02 | 0.3-0.6 | 0.15-0.30 | 49.0-50.0 | - | - | - | ≤0.2 | Bal |
1J79 | ≤0.03 | ≤0.02 | ≤0.02 | 0.6-1.1 | 0.30-0.50 | 78.5-81.5 | - | - | 3.8-4.1 | ≤0.2 | Bal |
1J85 | ≤0.03 | ≤0.02 | ≤0.02 | 0.3-0.6 | 0.15-0.30 | 79.0-81.0 | - | - | 4.8-5.2 | ≤0.2 | Bal |
Nickel (Ni) is a key element that enhances magnetic properties and stability.
Molybdenum (Mo) in 1J79 and 1J85 grades improves resistance to magnetic aging, ensuring long-term stability.
Silicon (Si) and Manganese (Mn): Improve alloy processing and help control grain structure.
Mechanical Properties
The mechanical and magnetic properties of these alloys are critical for their applications. Below is a summary of these properties:
Grade | Resistivity (μΩ·m) | Density (g/cm³) | High Saturated Magnetostriction Coefficient (×10¯²) | Brinell Hardness (HB) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
1J46 | 0.45 | 8.2 | 25 | 170 (unannealed) / 130 (annealed) | 735 (unannealed) / 735 (annealed) | - / - | 3 / - |
1J50 | 0.45 | 8.2 | 25 | 170 (unannealed) / 130 (annealed) | 785 (unannealed) / 450 (annealed) | 685 (unannealed) / 150 (annealed) | 3 / 37 |
1J79 | 0.55 | 8.6 | 2 | 210 (unannealed) / 120 (annealed) | 1030 (unannealed) / 560 (annealed) | 980 (unannealed) / 150 (annealed) | 3 / 50 |
1J85 | 0.56 | 8.75 | 0.5 | - / - | - / - | - / - | - / - |
Resistivity: Higher in 1J79 and 1J85, aiding in energy efficiency for electromagnetic applications.
Density: Gradually increases from 1J46 to 1J85, which influences overall alloy mass and magnetic performance.
Magnetostriction Coefficient: High in 1J46 and 1J50, benefiting applications that require robust magnetic response.
Summary
Magnetic alloys 1J46, 1J50, 1J79, and 1J85 are engineered to provide high magnetic permeability, low coercivity, and mechanical stability, making them indispensable in fields like transformers, electromagnetic shielding, and magnetic components. Each alloy grade is designed with specific compositions and properties to meet stringent standards (GBN198-1988) for various advanced electromagnetic applications.