Technical specifications for nickel-iron soft magnetic alloys
This standard is applicable to the cold-rolled strips, cold-drawn wires, cold-drawn (rolled) pipes, hot-rolled (forged) flat bars and rods & bars of such nickel-iron soft magnetic alloys as 1J46, 1J50, 1J54, 1J76, 1J77, 1J79, 1J80, 1J85 and 1J86 as well as the cold-rolled strips of such nickel-iron soft magnetic alloys as 1J34, 1J51, 1J52, 1J65, 1J67, 1J83 and 1J403 with high permeability and low coercivity in weak magnetic field.
1 Dimension and shape
1.1 Dimension
The dimension and allowable deviation of alloy materials shall comply with the relevant provisions of GBn 197-88 General rules of dimensions, shape, surface quality, test method and inspection for soft magnetic alloys.
1.2 Shape
The shape of alloy materials shall comply with the relevant provisions of GBn 197-88.
2 Technical requirements
2.1 Designations and chemical compositions
The designations and chemical compositions of alloy materials shall comply with those specified in Table 1. When the magnetic properties of alloys comply with those specified in Table 2 to Table 6, the chemical composition is allowed to deviate from the range specified in Table 1.
2.2 Smelting method
The alloy is smelted by vacuum induction furnace, other smelting methods complying with the requirements of this standard may also be adopted, but shall be indicated in the quality certificate.
2.3 Delivery state
The alloy materials shall be delivered without heat treatment. The alloy materials may also be delivered in semi-soft or soft state upon request of the purchaser. The magnetic properties and mechanical properties of alloy materials shall be negotiated by the supplier and the purchaser.
2.4 Magnetic properties
2.4.1 The magnetic permeability μ0.4, μ0.02 & μm, coercivity Hc and block coefficient Br/Bm of alloy samples after heat treatment shall comply with those specified in Table 2 to Table 6. As for saturation magnetic induction Br and magnetic properties of thin strips with thickness less than or equal to 0.01mm, the data shall be provided but not adopted as judgment basis. The elastic permeability μ1 and iron loss P1/400 and P1/1000 may also be provided if required by the purchaser.
2.4.2 The magnetic temperature stability inspection may be carried out upon request of the purchaser, and the indexes shall be negotiated by the parties.
2.4.3 When ordering is made according to the magnetic properties of Grade II and Grade III alloys and the elastic permeability μ1, iron loss P1/400 & P1/1000 are used as assessment value, the condition shall be indicated in the contract.
2.5 Surface quality
The surface quality of alloy materials shall comply with the relevant provisions of GBn 197-88.
3 Test methods
The test methods of alloy materials shall comply with the provisions of GBn 197-88.
4 Inspection rules
The inspection rules shall comply with the provisions of GBn 197-98.
5 Packaging, marking and quality certification
Packaging, marking and quality certification of finished alloy products shall comply with the relevant provisions of GBn 112-81 General rules of packaging, marking and quality certification for precision alloys.
Table 1
Category Alloy DN Chemical composition %
C P S Mn Si Ni Cr Co Mo Cu Fe
≤
Soft magnetic alloys with high permeability and higher saturation magnetic induction 1J46
1J50
1J54 0.03
0.03
0.03 0.020
0.020
0.020 0.020
0.020
0.020 0.60~1.10
0.30~0.60
0.60~1.10 0.15~0.30
0.15~0.30
0.15~0.40 45.0~46.5
49.0~50.5
49.5~51.0 —
—
3.80~4.20 —
—
— —
—
— ≤0.20
≤0.20
≤0.20 Balance
Balance
Balance
Soft magnetic alloys with high initial permeability 1J76
1J77
1J79
1J80
1J85
1J86 0.03
0.03
0.03
0.03
0.03
0.03 0.020
0.020
0.020
0.020
0.020
0.020 0.020
0.020
0.020
0.020
0.020
0.020 0.30~0.60
0.30~0.60
0.60~1.10
0.60~1.10
0.30~0.60
≤1.00 0.15~0.50
0.15~0.30
0.30~0.50
1.10~1.50
0.15~0.30
≤0.30 75.0~76.5
75.5~78.0
78.5~80.0
79.0~81.0
79.0~81.0
80.5~81.5 1.80~2.20
—
—
2.60~3.00
—
— —
—
—
—
—
— —
3.90~4.50
3.80~4.10
—
4.80~5.20
5.80~6.20 4.80~5.20
4.80~6.00
≤0.20
≤0.20
≤0.20
— Balance
Balance
Balance
Balance
Balance
Balance
Rectangular magnetic alloy 1J34
1J51
1J52
1J65
1J67
1J83
1J403 0.03
0.03
0.03
0.03
0.03
0.03
0.03 0.020
0.020
0.020
0.020
0.020
0.020
0.020 0.020
0.020
0.020
0.020
0.020
0.020
0.020 0.30~0.60
0.30~0.60
0.30~0.60
0.30~0.60
0.30~0.60
0.30~0.60
0.30~0.60 0.15~0.30
0.15~0.30
0.15~0.30
0.15~0.30
0.15~0.30
0.15~0.30
0.15~0.30 33.5~35.0
49.0~50.5
49.0~51.0
64.5~66.0
64.5~66.0
78.5~79.5
39.0~41.0 —
—
—
—
—
—
— 28.5~30.0
—
—
—
—
—
24.5~25.5 2.80~3.20
—
1.80~2.20
—
1.80~2.20
2.80~3.20
3.80~4.20 ≤0.20
≤0.20
≤0.20
≤0.20
≤0.20
≤0.20
— Balance
Balance
Balance
Balance
Balance
Balance
Balance
Table 2 DC magnetic properties of soft magnetic alloys with high permeability and higher saturation magnetic induction
Alloy DN Product type Grade Thickness or diameter mm Permeability μ0.4 when the magnetic field strength is 0.4A/m Maximum permeability μm Coercivity Hc under saturation magnetic induction saturation magnetic induction Bm
mH/m A/m T
≥ ≤
1J46 Cold-rolled strip 0.02~0.04
0.05~0.09
0.10~0.19
0.20~0.34
0.35~2.50 1.6
2.0
2.5
3.1
3.5 22.5
27.5
31.3
37.5
45.0 32
24
20
16
12 1.5
1.5
1.5
1.5
1.5
Hot-rolled (forged) flat bar 3~22 2.5 31.3 16 1.5
Hot-rolled (forged) rod and bar 8~100 2.5 31.4 16 1.5
1J50 Cold-rolled strip I 0.05~0.09
0.10~0.19
0.20~0.34
0.35~0.50
0.51~1.00
1.10~2.50 2.5
2.9
3.3
3.8
3.8
3.5 35
40
50
62.5
62.5
56.3 20
14.4
11.2
9.6
9.6
9.6 1.5
1.5
1.5
1.5
1.5
1.5
II 0.10~0.19
0.20~0.34
0.35~0.50
0.51~1.00
1.10~2.5 3.8
4.4
5.0
5.0
3.8 43.8
56.3
65
50
44 12
10.4
8.8
10
12 1.5
1.5
1.5
1.5
1.5
III 0.05~0.20 12.5 75 4.8 1.52
Hot-rolled (forged) flat bar 3~22 3.1 31.3 14.4 1.5
Hot-rolled (forged) rod and bar 8~100 3.1 31.3 14.4 1.5
1J54 Cold-rolled strip I 0.005
0.01
0.02~0.04
0.05~0.09
0.10~0.19
0.20~0.34
0.35~0.50
0.51~1.00 1.25
1.60
1.9
2.5
3.1
3.8
4.0
3.8 10
12.5
20
25
31.3
35
40
40 55
40
20
16
12
9.6
8
8 1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.1
II 0.02~0.04
0.05~0.09
0.10~0.19
0.20~0.34
0.35~0.50 3.8
3.8
3.9
3.9
4.4 31
31
35
37.5
44 12
12
10
10
8 1.0
1.0
1.0
1.0
1.0
Hot-rolled (forged) flat bar 3~22 2.0 20 20 1.0
Hot-rolled (forged) rod and bar 8~100 2.0 20 20 1.0
Note: The saturation magnetic induction Bm is measured with the external magnetic field with strength of 2,000 ~ 2,400A/m.
Table 3 AC magnetic properties of soft magnetic alloys with high permeability and higher saturation magnetic induction
Alloy DN Product type Grade Thickness mm The elastic permeability μ1 at different frequencies when the peak value of magnetic field strength is 0.4A/m
60Hz 400Hz 1kHz 10kHz
mH/m
≥
1J50 Cold-rolled strip II 0.02
0.05
0.10
0.20
0.35 —
—
—
—
5.0 —
—
3.9
3.8
3.8 2.5
2.5
3.8
3.0
— 2.0
1.8
—
—
—
Table 4 DC magnetic properties of soft magnetic alloy with high initial permeability
Alloy DN Product type Grade Thickness or diameter mm Permeability μ0.08 when the magnetic field strength is 0.08A/m Maximum permeability μm Coercivity Hc under saturation magnetic induction saturation magnetic induction Bm
mH/m A/m T
≥ ≤
1J76 Cold-rolled strip 0.02~0.04
0.05~0.09
0.10~0.19
0.20~0.50 18.8
22.5
25
31.3 75
125
175
225 4.8
3.2
2.8
1.4 0.75
0.75
0.75
0.75
1J77 Cold-rolled strip 0.05~0.09
0.10~0.19
0.20~0.34
0.35~0.50 37.5
50
62.5
75 175
225
275
312.5 2.0
1.2
1.0
0.8 0.60
0.60
0.60
0.60
1J79 Cold-rolled strip I 0.005
0.01
0.02~0.04
0.05~0.09
0.10~0.19
0.20~0.34
0.35~1.00
1.10~2.50
2.51~3.00 12.5
17.5
20
22.5
25
28
31
28
26.3 44
87.5
112.5
137.5
162.5
225
250
225
187.5 6.4
4.8
4.0
2.8
2.0
1.6
1.2
1.6
2.0 0,75
0.75
0.75
0.75
0.75
0.75
0.75
0.75
0.75
II 0.005
0.01
0.02~0.04
0.05~0.09
0.10~0.19
0.20~0.34
0.35~1.00
1.10~2.50 15
20
25
25
28
31
38
31 75
110
125
150
190
250
280
230 4.8
3.2
2.4
1.6
1.2
1.2
1.0
1.2 0.75
0.75
0.75
0.75
0.75
0 75
0.75
0.75
Cold-rolled strip III 0.01
0.02~0.04
0.05~0.09
0.10~0.19
0.20~0.34
0.35 25
31
38
38
38
44 150
190
250
250
280
310 2.4
1.6
1.2
1.2
1.0
1.0 0.73
0.73
0.73
0.73
0.73
0.73
Hot-rolled (forged) flat bar 3~22 25 125 2.4 0.75
Hot-rolled (forged) rod and bar 8~100 25 125 2.4 0.75
1J80 Cold-rolled strip I 0.005
0.01
0.02~0.04
0.05~0.09
0.10~0.19
0.20~0.34
0.35~0.50
0.51~1.00
1.10~2.50 10
17.5
23
25
28
35
44
43.8
31 38
75
93.8
112.5
150
175
200
200
190 8.0
4.8
4.0
3.2
2.4
1.6
1.2
1.0
1.2 0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
0.65
II 0.02~0.04
0.05~0.09
0.10~0.19
0.20~0.34
0.35~0.50 28
38
40
44
44 125
190
200
200
250 3.2
1.6
1.2
1.2
1.0 0.63
0.63
0.63
0.63
0.63
III 0.01
0.02~0.04
0.05~0.09
0.10~0.34
0.35~0.50 31
38
50
56
63 110
150
250
250
310 3.2
1.6
1.0
1.0
0.8 0.63
0.63
0.63
0.63
0.63
Hot-rolled (forged) flat bar 3~22 27.5 100 2.‘ 0.65
Hot-rolled (forged) rod and bar 8~100 27.5 100 2.I 0.65
1J85 Cold-rolled strip I 0.005~0.01
0.02~0.04
0.05~0.09
0.10~0.19
0.20~0.34
0.35~1.00
1.10~2.50
2.51~3.00 20
22.5
35
37.5
50
62.5
50
43.8 87.5
100
137.5
187.5
225
312.5
187.5
150 4.8
3.6
2.4
1.6
1.2
0.8
1.2
1.4 0.70
0.70
0.70
0.70
0.70
0.70
0.70
0.70
Cold-rolled strip II 0.02~0.04
0.05~0.09
0.10~0.19
0.20~0.34
0.35 37.5
50
62.5
75
68.8 137.5
175
225
250
225 2.4
1.6
1.2
1.0
0.7 0.70
0.70
0.70
0.70
0.70
Hot-rolled (forged) flat bar 3~22 37.5 125 1.6 0.70
Hot-rolled (forged) rod and bar 8~100 37.5 125 1.6 0.70
1J88 Cold-rolled strip 0.005~0.01
0.02~0.04
0.05~0.09
0.10~0.19
0.20~0.34
0.35~1.00 12.5
37.5
50
62.5
75
62.5 100
137.5
187.5
225
275
250 4.0
2.4
1.4
1.2
0.7
1.2 0.60
0.60
0.60
0.60
0.60
0.60
Notes:
① Saturation magnetic induction Bm is measured under the external magnetic field strength of 800A/m.
② According to the agreement between the parties, if either μ0.08 or μm of Grades II and III 1J79, 1J80 and 1J85 alloys meets the standard, delivery is allowed, but other parameters cannot be inferior to those of Grade I.
Table 5 AC magnetic properties of soft magnetic alloys with high initial permeability
Alloy designation Product type Grade Thickness mm The elastic permeability μ1 at different frequencies when the peak value of magnetic field strength is 0.1A/m
60Hz 400Hz 1kHz 10kHz
mH/m
≥
1J79 Cold-rolled strip II 0.02
0.05
0.10
0.20
0.35 —
—
—
—
25 —
—
22.5
12.5
8.8 17.5
18.8
15
7.5
— 12.5
9.4
—
—
—
1J85 Cold-rolled strip II 0.02
0.05
0.10
0.20
0.35 —
—
—
—
38 —
—
31.3
23.8
12.5 20
31.3
25
10
— 15
11.3
—
—
—
Table 6 Magnetic properties of rectangular magnetic alloy
Notes:
① The saturation magnetic induction Bm is measured in the external magnetic field of 2,000~2,400A/m for 1J34, 1J51, 1J52 and 1J403 alloys, and is measured under the external magnetic field of 800A/m for 1J65, 1J67 and 1J83 alloys.
② Iron loss P1/400 and P1/3000 represent the iron loss when the frequency is 400Hz and 3,000Hz respectively and the peak value of magnetic induction is 1T.
③ The Bm in block coefficient Br/Bm represents the magnetic induction when the external magnetic field strength is 80A/m.
④ The iron loss of Grade 1 product of 1J403 alloy shall be determined at -40℃, +20℃ and +100℃.
1 Dimension and shape
2 Technical requirements
3 Test methods
4 Inspection rules
5 Packaging, marking and quality certification
Annex A (Informative) Basic physical parameters and typical mechanical properties of alloys
Annex B (Informative) Magnetic properties of alloys magnetized in different states
