N52 Grade OD75*ID60*H10mm Unipolar Radiation Magnetisation Ring Magnet N on the Inside
“N在内侧”表示在环结构的内侧，即环的中心区域，形成北极（N极）磁场。这种设计将磁场主要集中在内侧，同时形成外南极（S 极）磁场。
Brand:
KINGS MAGNETItem NO.:
ND75X60X20NRGoods Stock:
1Payment:
T/T 100% INADVANCEProduct Origin:
CNShipping Port:
XIAMENColor:
Black (usual) / Silver / Rare earth colorsLead Time:
30| Tol. | Grade | OD | ID | H |
| ±0.1mm | N35-N55 | Max.75mm | Max.71 | Adjusted to the ratio of OD to ID. |
|
Parameter
|
Unit | Value |
|
Density (ρ)
|
g/cm3
|
7.4-7.7
|
|
Curie Temperature (Tc)
|
°C
|
310-370
|
|
Recoil Permeability (μrec)
|
- |
1.05
|
|
Vickers Hardness (HV)
|
MPa
|
500-600
|
|
Bending Strength (σbb)
|
MPa
|
200-400
|
|
Compressive Strenght (σbc)
|
MPa
|
1000-1100
|
|
Tensile Strength (σb)
|
MPa
|
80-90 |
|
Resistivity (ρ)
|
μΩ·m
|
1.4-1.6 |
|
Thermal Conductivity (λ)
|
W/(m·K)
|
8-10 |
|
Young's Modulus (E)
|
GPa
|
150-200 |
|
Thermal Expansivity ∥ Magnetization (α∥)
|
10-6 /°C
|
3-4 |
|
Thermal Expansivity ⊥ Magnetization (α⊥)
|
10-6 /°C
|
1-3 |
Refer to the design drawings:
| Surface | Pictuer | Coating | Thickness of coating | Color | Resistance | Salt Spray Test（Hours） |
|
Nickel |
 |
NI+NI NI+CU+NI |
10-20um | Bright Silver | Excellent Against Humidity | 24-48 |
| Black Nickel |  |
NI+CU+NI | 10-20um | Bright Black | Excellent Against Humidity 8 Salt Spray | 48-72 |
| （Zn）Cr6+Zinc |  |
ZN | 5-8um |
Bright Blue Shining Color |
Excellent Against Salt Spray |
24-48 24-72 |
| （Zn）Cr3+Zinc |  |
ZN | 5-8um |
Bright Blue Shining Color |
Good Against Salt Spray Excellent Against Salt Spray |
16-48 24-72 |
| Tin |  |
Ni+Cu+Ni+Sn | 10-25um | Silver | Superior Against Humidity | 48-72 |
| Gold |  |
Ni+Cu+Ni+Au | 6-10um | Gold | Superior Against Humidity | --- |
| Ag |  |
Ni+Cu+Ni+Ag | 6-10um | Silver | Superior Against Humidity | --- |
| Passivation |  |
--- | 1-2um | Silver Grey | Temporary Protection | --- |
| Phosphated |  |
--- | --- | Silver Grey | Silver Grey | --- |
| Epoxy |  |
Epoxy Ni+Cu+Epoxy ZN+Epoxy |
10-25um | Black、Grey | Excellent Against Humidity& Salt Spray |
24-48 48-72 48-72 |
Other magnetisation directions:
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