POSCO Maharashtra Steel

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Cold Rolled Non Grain Oriented Steel

The non-oriented electrical steel features even magnetic properties in the rolling direction and in other directions. They are widely used for iron core materials of rotating machines ranging from large-size power generators to small-size precision electric motors. They are also desirable for iron core of small-size power transformers.

Cold Rolled Non Grain Oriented Steel

Grade Thickness mm (Inch) Density (Kg/dm3) Core Loss Max. (W15/50) Magnetic Flux Density Min. T (B50) Lamination Factor, Min (%)
POSCO Equivalent to IS Grade Watt/Kg Watt/lb
35PN230 35C230 0.35 (0.0138) 7.60 2.30 1.04 1.62 95
35PN250 35C250 7.60 2.50 1.13 1.62
35PN270 35C270 7.65 2.70 1.22 1.62
35PN300 35C300 7.65 3.00 1.36 1.62
35PN360 35C360 7.65 3.60 1.63 1.63
35PN440 7.70 4.40 1.99 1.65
50PN290 50C290 0.50 (0.0197) 7.60 2.90 1.32 1.62 96
50PN310 50C310 7.65 3.10 1.41 1.62
50PN350 50C350 7.65 3.50 1.59 1.62
50PN400 50C400 7.65 4.00 1.81 1.63
50PN470 50C470 7.70 4.70 2.13 1.64
50PN600 50C600 7.75 6.00 2.72 1.66
50PN700 50C700 7.80 7.00 3.17 1.70
50PN800 50C800 7.85 8.00 3.63 1.70
50PN1000 50C1000 7.85 10.00 4.53 1.70
65PN400 65C400 0.65 (0.0256) 7.65 4.00 1.81 1.65 97
65PN470 65C470 7.70 4.70 2.13 1.65
65PN600 65C600 7.75 6.00 2.72 1.66
65PN700 65C700 7.80 7.00 3.17 1.70
65PN800 65C800 7.85 8.00 3.63 1.70
65PN1000 65C1000 7.85 10.00 4.53 1.70

Note : The above test is conducted in accordance to IEC60404-2 / JIS C2550-2000 / IS : 648 : 2006. W15/50 indicates the core loss at magnetic flux density of 1.5T & frequency of 50 Hz .

Typical Mechanical Property and Lamination Factor

Grade Thickness mm (Inch) Tensile Strength (N/mm2) Yeild Strength (N/mm2) Elongation % Hardness (HV1) Lamination Factor (%)
POSCO Equivalent to IS Grade L C L C L C
35PN230 35C230 0.35 (0.0138) 535 545 393 403 19 20 216 97.5
35PN250 35C250 522 539 370 385 19 21 214
35PN270 35C270 470 490 350 360 21 23 190
35PN300 35C300 456 469 336 351 21 23 188
35PN360 35C360 450 470 310 330 23 25 170
35PN440 405 415 273 285 27 29 155
50PN290 50C290 0.50 (0.0197) 510 530 370 386 23 25 195 98
50PN310 50C310 483 505 355 361 25 28 189
50PN350 50C350 470 489 344 354 25 28 185
50PN400 50C400 465 482 352 365 27 30 183
50PN470 50C470 420 430 275 285 34 36 155
50PN600 50C600 395 405 268 278 37 39 130
50PN700 50C700 385 395 265 275 38 39 125
50PN800 50C800 375 385 260 270 39 40 118
50PN1000 50C1000 370 380 250 260 40 41 113
65PN400 65C400 0.65 (0.0256) 480 485 335 340 29 30 180 98
65PN470 65C470 425 435 290 305 34 36 155
65PN600 65C600 390 395 270 280 35 37 130
65PN700 65C700 380 390 265 275 36 38 121
65PN800 65C800 370 385 260 270 38 40 116
65PN1000 65C1000 370 380 250 260 41 42 110

Note :1. L : Specimens taken longitudinal to the rolling direction, C: Specimens taken transverse to the rolling direction.
2. Specification with C-6A coating are used for lamination factor test.

Tolerances

Width
mm (in)
Thickness
mm (in)
Thickness Tolerance
mm (in)
Thickness deviation in transverse direction
mm (in)
Width Tolerance
mm (in)
Camber
(Length: 2m)
mm (in)
1,000 (39.37) and under 0.35 (0.0138)
0.50 (0.0197)
0.65 (0.0256)
±0.028 (0.00110)
±0.040 (0.00158)
±0.039 (0.00154)
0.020 (0.0008) and under
0.020 (0.0008) and under
0.030 (0.0012) and under
+1.0 (0.0394)
– 0.0
1.0 (0.0394) and under
1,000 (39.37) and over 0.35 (0.0138)
0.50 (0.0197)
0.65 (0.0256)
±0.028 (0.00110)
±0.040 (0.00158)
±0.039 (0.00154)
0.020 (0.0008) and under
0.020 (0.0008) and under
0.030 (0.0012) and under
+1.5 (0.0591)
- 0.0

Coating

Types and Features of Surface Insulation

Coating types -> C-6A C-9A Remarks
Equivalent ASTM type C-5 C-5
Composition organic/filler organic/filler
Thickness (um) 0.40~0.60 1.00~1.20
Resistivity (Ωcm²/sheet) Before SRA ≥0.5 ≥5.0 ASTM A717 SRA condition:750°C x 2hrs.In DX rich gas
After SRA ≥0.1 ≥0.5
Lamination factor (%) 98 98 1.0 Mpat 0.05 in pressure (JIS C 2550)
Heat Resistance flaking after SRA Not Recongnized Not Recongnized 150°C x 24hr in Air
Not Recongnized Not Recongnized 750°C x 2hrs.In DX rich gas
Weathering (powdering) Not Recongnized Not Recongnized 65°C, 95% humidity, 72hr
Adhesion (mmΦ) Before SRA(mandrel bend tester) 10 10 ISO1519
After SRA(cross cut tester) 5B 5B ASTM D3359B [0B(poor)~5B(excellent)] SRA
Resistance to Refrigerents Change of surface Not Recongnized Not Recongnized R-134a/Freol @15C=65g/100g(1300C, 21day, 0.45μ.m filter paper)
Change of weight Not Recongnized Not Recongnized
Weldability excellent good Current : 100~150A, Ar99% flow.10~20L/min, Speed:0.25~0.50mpm

Note :1. Please designate surface insulation according to usage.Regarding coating properties,please contact us.
2. The coating thickness value and the resistivity is typical value, not guaranteed.