The POSCO Quality

Electrical steel

Electrical plates are also called electronic plates or silicon plates. Compared to regular steel plates, silicon plates contain more silicon, featuring good electric and magnetic characteristics

Surface Insulation

Type and Features of Surface Insulation

Àý¿¬ÇǸ·ÀÇ Á¾·ù ¹× Ư¼º Á¤º¸
GO NO Remarks
Regular Eco-Friendly Regular Eco-Friendly
OA GS C-6A
(thin)
C-9A
(middle)
NS
(thin)
NM
(middle)
NT
(thick)
Applied Spec GO NO
Composition Inorganic Inorganic Organic/filler Organic/filler Organic/filler Organic/filler Organic/filler
Thickness (¥ìm) / plane 2.0~5.0 2.0~5.0 0.5~1.0 1.2~1.8 0.5~1.0 1.2~1.8 5.0~7.0
Resistivity
(§Ùcm©÷/sheet)
Before SRA 15 15 0.5 5.0 3.0 5.0 50 ASTM A 717
SRA condition: 750¡É ¡¿ 2 hrs. in DX rich gas
After SRA 15 15 0.1 0.5 1.5 2.5 SRA not accepted
Lamination factor (%) 95.0 95.0 98.0 98.0 98.0 98.0 97.0 1.0MPa¡¾0.05 in Pressure(JIS C2550)
Heat Resistance
(flanking after SRA)
Continuous Not recognized Not recognized Not recognized Not recognized Not recognized Not recognized SRA not accepted 155¡É¡¿24hr in Air.
Short Not recognized Not recognized Not recognized Not recognized Not recognized Not recognized SRA not accepted 750¡É¡¿2hrs. in DX rich gas
Weathering (powdering) Not recognized Not recognized Not recognized Not recognized Not recognized Not recognized Not recognized 65¡É, 95% humidity, 72Hr
Adhesion
(mm¥Õ)
Before SRA
(Mandrel bend tester)
30 30 10 10 10 10 20 ISO 1519
Before SRA
(Mandrel bend tester)
- - 5B 5B 5B 5B 5B ASTM D3359B
[0B (poor)~5B (excellent)]
Resistant to
Refrigerants
Change of Surface - - Not recognized Not recognized Not recognized Not recognized - R-134a/Freol @15C=
65g/100g
(130¡É, 21day, 0.45¥ìm filter paper)
Change of Weight - - Not recognized Not recognized Not recognized Not recognized -
Weldability - - Excellent Normal Good Normal Not allowed Current : 100~150A
Ar 99% flow : 10~20L/min
Speed : 0.25~0.50mpm