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JFE Steel offers the following types of coatings for surface
insulation.The customers can select one that best meets their requirements
for interlamination resistance, punchability, heat resistance, Freon
resistance and other properties. |
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As to A, N coating, an organic resin is added to inorganic
coating.
It has excellent punchability, corrosion resistivity and Freon resistance,
with exceedingly high interlamination resistance shown in the case of
the higher grades. Suited to large rotors, especially to motors for electric
household appliances where good punchability is required.
A and N Coating has no equivalent in the AISI standards. |
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This phosphate-based inorganic coating has been extensively
used since its development in 1959, as it has such excellent characteristics
as interlamination resistance, adhesion, heat resistance, lamination
factor required for coating.
The interlamination resistance becomes better as the grade becomes higher.D-coating
is equivalent to AISI Core Plate C4. |
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An organic resin is also partially added to inorganic coating.
In comparison with A,N coating, it has excellent heat-resistancy due
to the improvement of an organic resin itself.
J coating has no equivalent in the AISI standards. |
| Unless otherwise specified, A Coating will be
applied and at the end of grade designation, type of surface insulation
is indicated.
Ex : 50JN600*A means 50JN600 appiled with A coating. |
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| The Characteristics of Insulating Coatings for
JFE N-CORE (0.5mm thic
k) |
| Items |
A, N (thin) |
J (thin) |
A, N (thick) |
D |
Notice |
| (1) Applied grades |
JN, JNE, JNEH, JNA |
JN, JNA |
JN, JNE, JNEH, JNA |
JN, JNE, JNA |
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| (2) Comparable to AISI Core-Plate |
- |
- |
- |
C-4 |
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| (3) Composition |
Inorganic with some organic materials |
Inorganic with some organic materials |
Inorganic with some organic materials |
Inorganic (Phosphate) |
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| (4) Tickness of coating (mm
per side) |
0.2 - 0.5 |
0.2 - 0.5 |
0.6 - 1.4* |
0.3 - 0.8* |
*The higher grade,the higher value. |
| (5) Lamination factor (%) |
98.5 |
98.5 |
98.0 |
98.0-98.5 |
Pressure : 1N/mm2 (JIS C 2550) |
| (6) Adhesion (mmø) |
10 |
10 |
10 |
20 |
Minumum mandrel diameter without flaking |
| (7) Interlaminar resistance (W-cm2/sheet) |
Before annealing |
1 - 10 |
1 - 10 |
10 - 80 |
1 - 30 |
JIS C 2550, Pressure : 2N/mm2,Electrode:1cm2×10 pieces, Voltage : 0.5V D.C.
Annealing condition : 750°C×2hrs. in DX rich gas |
| After annealing |
<1-5 |
<1-5 |
<1-20 |
<1-5 |
| (8) Resistance to rust, Appearance
change |
not recognized |
not recognized |
not recognized |
not recognized |
Humidity cabinet test at 49 °C (relative humidity ≥ 98%) for 50 hrs. |
| (9) Resistance to freon |
Appearance change |
" |
" |
" |
" |
Freon : Lubricating oil = 9:1 at
80 °C for 10 days |
| Weight change |
" |
" |
" |
" |
| (10) Resistance to insulating oil |
Appearance change |
" |
" |
" |
" |
at 120°C for 72 hrs. (oil : JIS
C 2320) |
| Weight change |
" |
" |
" |
" |
| (11) Punchability Number of punchings
at which burr height reaches 50mm. ( ×103) |
Steel die |
50JN350 |
- |
- |
500 |
30 |
Material of die:Tool steel Shape
of punch:15mm dia. Clearance : 5% of sheet thickness Punching oil:Applied |
| 50JN470 |
- |
- |
600 |
40 |
| 50JN800 |
1000 |
1000 |
1500 |
80 |
| Carbide die |
50JN800 |
3000 |
3000 |
3000 |
1100 |
Material of die : WC-Co (JIS B 4104 V2) |
| (12) Weldability Max.welding speed
without blowholes(cm/min) |
60 |
60 |
30 |
120 |
Current : 120A, Ar gas flow:6l/min., Electrode
: Th-W 2.6mmø , Gap between material andelectrode : 15mm, Clamping
pressure : 100kg/cm2, Weld groove : Provided |
| (13) Heat resistance Flaking after
annealing |
not recognized |
not recognized |
not recognized |
not recognized |
Annealing condition: 750°C×2hrs. in DX rich
gas |
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| Note: These above values are those obtained under the certain limited
conditions in our laboratory. |
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