GB/T 14987-1994 High hardness, high resistance and high magnetic permeability alloy
Some standard content:
National Standard of the People's Republic of China
High permeability alloys with high hardness andhigh electrical resistance
GB/T 14987-94
Replaces GRm161-82
This standard is applicable to the production of 1187, 118, 189, 1190 and 1191 soft magnetic alloy cold-rolled strips for the production of tape recorder and tape recorder head chips and micro motors, transformers, sensors, magnetic amplifiers and other high-frequency inductor cores. 1 Dimensions and appearance
1.1 The thickness, width and length of the cold-rolled strip and their allowable deviations shall comply with the provisions of Table 1. Installation 1
0.02 ~ 0.04
- 0, 04 - 0, 09
.09~0.15
.15 -0.25
0.26~0.4n
0.40～0.74
0.70 -1.00
Allowable deviation
40~160
Allowable deviation
When there are special requirements for length, width and allowable deviation, it should be indicated in the contract. 1.2 The bend in each meter of cold-rolled strip shall not exceed 3 cut lengths
1.3 The cold-rolled strip shall not have emulsion, oil, wrinkles and corrugated liquid (the ratio of the peak height to the peak distance shall not be greater than 1/25): 1.4 Cold-rolled alloy strips shall be delivered in batches. For materials with a thickness of 0.5mm, the inner diameter of the strip coil shall be greater than 15%mm. 1.5 Marking example:
The 1J87 alloy cold-rolled strip with a thickness of 1.05mm and a width of 80mm is marked as: Cold strip 1J87-13.05×80—GB/T14987—942 Technical requirements
2.1 Brand and chemical composition
The brand and chemical composition of the enterprise shall comply with the provisions of Table 2. However, when the physical properties meet the requirements of this standard, the chemical composition shall not be used as a basis.
Approved by the State Technical Supervision Commission on April 4, 1994
Implemented on May 1, 1994
Alloy grade
Current grade
1.00 2.20
3.50~4.50
1.80~2.20
GB/T14987—94
.30 -0.G0
F. 51- 7.50
7.5(1 ~9.00
3.00~3.60
4.80~7.20
7.7 - 8. 40
No big protection
point,%
0.40-0,G0
i.川1.20
78.5~80.5
79.5~80.5
78.5~B0.5
78.5 ~ 80.n
2.2 Smelting method
The alloy shall be smelted by vacuum induction core. Other smelting methods that can meet the requirements of this standard may also be adopted with the agreement of both parties. 2.3 Delivery status
The alloy strip is delivered in cold coils. 2.4 Physical properties
2.4.1 The DC magnetic properties, resistivity and crown micro whisker of the alloy strip shall comply with the provisions of Table 3. Joint enterprise
Alloy strip
0.n2 ~0.04
0,01 - 0,09
≥ 0,09 - 0.29
> 0.29 - .50
>0.50 -1.00
0.02 ~ U.14
30. 09 ~ 0. 29
>0.29 ~ 1. 00
0.02- 0.014
> 0. 04 ~ 09
2>0.09 ~ D. 29
> 1,2 ~ 1, 00
0.02 -.11
09~n. 29
n.29 -1,
5,02~0,04
2 1, 04 ~ 0. 09
0. 09 ~ 0.29
≥0.29~1.00
GB/T 14987—94
Maximum title number
Naughty side
Gs/O(mllm)jGs:e(mll:m)
3000 (37.6)
3500 (43.8)
40000 (60.0)
35H(43.8)
R500u (+3.8)
3000u (37.5)
35U (43.8)
40000(50.0)
40000 37.53
15uoh (18.8)
20uu0 (27.0)
2500m (31.3)
20000 (25.0)
30m (37.5)
35000 (43.8)
44u (50.0
3500u(13,8)
5000 (6.25)
8000(10.0)
8000(10.0)
0(125)
12mmn(150)
200000(250)
180 0(225)
150t00(187.5)
ZHO0(125)
120000(150)
150000187.5)
100(125)||tt ||7000（H7.5)
900(0(112.6)
100000(125)
B00mb(i0o)
1000300(125)
15000 (187.5)
180000(225)
150000(187.5)
4nonn(50)
6((75)
80060(160)
6 (75)
Oe (A/m)
Not so much
0.123 (2.n)
0.015 (1.2)
(.01u (0.8)
1.015(1.2)
0.020 (1.6)
0.025(2.0)
0.020 (1.6)
0.015 (1.2)
0.025 (2.0)
n.o3m(2,4)
0.020 (1.6)
(.015 (1.2)
n.n20 (1.6)
0.025 (2.0)
0,02u (1.6)
0.010 (n.8)
.H5(1.2)
U.04t(3.2)
0.025 (2.0)
0.020 (1,6)
0.025 (2.0)
Avoid induction strength width
not less than
6Uuu (0.5)
5500 (0.55)
450n(0.45)
45m (0.45)
4500 (0.45)
Electromagnetic efficiency
The magnetic properties of the alloy strip are measured without coating the sample. The apparent initial permeability and maximum permeability μm of the coating sample are allowed to be reduced by 20% respectively, and the correction value H is allowed to be increased by 20%. The hardness and hardness of the alloy material are not only tested, but also not judged. If the purchaser has requirements, it should be stated in the final report. 2.4.2 The elastic permeability of the alloy strip is shown in Table 4. The test results of elastic permeability are for reference only and will not be used as a basis for judgment. If the party has any requirements, it should be noted in the contract. If the party requires elastic permeability at frequencies other than those specified in Table 4, it should also be noted in the contract.
Combined frequency
23000 (28.8)
250 (31.3)
26000 (32.5)
23000 (28.8)
2200 (27.5)
2400 (31.1)
22000 (27.5)
20000 (25.0)
12nmm (15.n)
14000 (32.5)
23000 (28.8)
22000 (27.5)
24000 (31.1)
22000 (27.5)
20000 (27.5)
12nmm (15.n)
14000 (32.5)
23000 (32.5)
23000 (28.8)
22000 (27.5)
24000 (31.1)
220000 (27.5)
12nmm (15.n)
14000 (32.5)
23000 (32. (17.5)
1600 (26.0)
13[(16.3)
25un (31.3)
26000 (32.5)
39 (4.)
400. (5.)
4200 (5.25)
370m (1.63)
GB/T 14987-94
B=20(isF elasticizer$ratio:Gs0e(mHm)100k112
10kllz
20000 (25.m)
17000(21.3)
4500 (5.63)
2unlit(25.0)
17u(21.3
90 (11.3)
4500(5.63)
10000(12.5)
7(0n (8.75)
4000(5.0)
2000 (2.50)
20000 (25.0)
1700u(21.3)
1500 (15.8)
50mn (6.25)
3500 (4.38)
3200 (4.00)
3000(3.75)
2000 (2.50)
5500 (6.80)
40m(6.00)
180u(2.25)
800 (1.00)
4500(5.63)
3um(3.75)
1500 (1.88)
780 (0.975)
5500 ((6.80)
400u(5.00)
IBUU (2.25)
B00 (1.00)
on (7.50)
45uu (5.63)
2umn(2.50))
9II (1.13)
300 (3.75)
1500(1.88)
1000 (1.25)
500 (0.625)
500 yuan Hz
iun(t.25)
800(1.00)
400 (0.50)
12 (1.0)
100h(1.25)
500 (0.625)
1200(1.30)
900 (1.13)
610m(0.75)
1000(1.25)
800 (1.00)
300 (0.375)
lmnkHz
701 (11.876)
500 (0.625)
200(0.250)
800(1.00)
600(0.75)
30(0.375)
HUn (-.G)
7O0 (0.H75)
For the 187 and 1J90 alloy strips with a thickness of 0.20mm and 0.35mm for the core of the micro motor, the peak value 2.4.3
magnetic permeability shall comply with the provisions of Table 5. Table 5
Alloy strip thickness
Taiwan gold grade
1m12 translation value conductivity. Gs70c (mll/m) not less than Hpt.u
211(26.3)
[(2,0)
2.5Surface quality
GB/T14987-94
The surface of the alloy strip should be smooth and clean, and the surface finish should not be less than 7. However, oxidation color, individual small pits, aging and slight scratches that do not affect the use are allowed to exist. 3 Test method
3.1 The size of the alloy strip shall be measured with a sufficient precision. 3.2 The surface quality of the alloy strip shall be checked one by one. 3.3 The chemical composition analysis of the alloy shall be carried out in accordance with YB789-75 "Chemical Analysis Method of Refined Alloys". 3.4 DC performance Two samples shall be taken from the same alloy strip of the same size. For alloy strips with a thickness greater than .1mm, a ring sample with an inner diameter of 30mm and an outer diameter of 40mm shall be taken; for alloy strips with a thickness less than 1mm, a strip with a width of 1m shall be taken, burrs shall be removed, and after cleaning, it shall be wound into a ring sample with an inner diameter of 2mm and an outer diameter of 26mm. The weight of each sample shall be 15-20g. After the sample is finally heat treated, the DC performance shall be measured at room temperature using the impact method. The initial permeability shall be measured at 0.0010e, and the coercive force H. and Bs shall be measured at 100e.
3.5 Elastic permeability samples Take two samples from the same furnace number and the same size alloy strip. Take a strip with a width of about 10mm from the original gold-containing strip with a thickness of less than 10mm, remove the tongue piece, clean it, and then use the magnesium electrolyte coating to wind it into a ring sample with an inner diameter of 20mm and an outer diameter of 26mm. The weight of each sample is 15 to 20 grams. After heat treatment, the sample is measured with the bridge method at a magnetic induction of 20Gs, and the measurement is allowed at 10 to 20Gs at 1kHz. 3.6 Peak permeability samples Take two samples with an inner diameter of 30am and an outer diameter of about 10nm from the same furnace number and the same size alloy strip. After heat treatment, the insulation paper between the sheets is asked, and the peak permeability is measured by the ampere method. The product is measured at 0.010e. 3.7 Resistivity samples Take two samples from each furnace number. For alloy strips with a thickness of 0.20mm or more, samples are taken from the finished product; for alloy strips with a thickness of less than 0.21mm, samples are taken from strips with a thickness of 0.11mm or 0.20mm. The sample width is 10mm or 10mm, the length is 150mm, and the measuring length is 100mm. After heat treatment with magnetic samples, the film distance rate is measured by the bridge method under room humidity. 3.8 hardness sample number two samples are taken out. For alloy strips with a thickness of 0.2mm or more, samples are taken from the finished product; for alloy strips with a thickness of less than 0.20mm, samples are taken from strips with a thickness of 0.11mm or 0.2mm. The sample size is [(mm × 20mm. After the magnetic sample is heat treated, the microhardness HV is measured with a microhardness tester with a load of 10%. 4 Inspection rules
4.1 Inspection and acceptance
The alloy strips shall be inspected and tested by the supplier's technical supervision department. 4.2 Batch rules
The alloy strips shall be submitted for inspection and acceptance in batches. Each batch shall consist of alloy strips with the same smelting number, brand and size. 1.3 Re-inspection and judgment rules
If a certain inspection result is unqualified, it is allowed to re-sample for re-inspection (the sample is the same as the initial inspection) or re-heat-treat, and then submit for inspection and acceptance again.
5 Packaging, marking and quality certificate
The packaging, marking and quality certificate of the finished alloy strips shall comply with the relevant provisions of YB/T521293 "General Provisions on Packaging, Marking and Quality Certificate of Precision Alloys". GB/T 14987—94
Appendix A
Recommended heat treatment system
(Supplement)
A.1 For heat treatment, hydrogen with a dew point lower than -40°C is used as the medium, and magnesium oxide (or magnesium oxide) is used as the separator. When using vacuum medium, vacuum mmmg is required.
A.2 The heat treatment system for the strip is as specified in the following table. The heat treatment degree can be adjusted while ensuring the performance is intact. Annealing medium
Alloy grade
Decahydrogen or vacuumbzxZ.net
Dry oxygen or vacuum
T Hydrogen or vacuum
Hydrogen or magnesium oxide
Alloy strip thick immersion
. 0),24)
Heat temperature, C
(Suifang Sheng mixed)
950~1150
1150~1251
9511~1150
1150~1200
9501100
1100-1200
1900-1150
1000~1200
1100~1150
11001200
Hou Yunjian
Cooling system
Slowly cool to 500℃ at 1000℃/h and keep warm for h,
cool to 35% at 10~30(h) and then cool to 20oC in the furnace
cool to 600℃ at 100～200℃/h (furnace cooling) (200-300℃/h)
cool to 200℃ at 200~300℃/h or
cool to 600℃ at 200~300℃/h and keep warm
[~4h, then cool to 200℃ at 100℃/h C is cooled to 250℃ by the furnace (or cooled to 250℃ by 250℃/h)
After cooling to room temperature, the temperature is raised to 70℃ (keep warm for 1h (the medium is source gas or lubricating solid delivery) and pulled to the cold part of the furnace mouth
The alloy density is as follows.
Alloy grade
Density, g/cm\
GB/r14987-94
Appendix B
Alloy density
(reference)
Additional remarks:
This standard is proposed by the Ministry of Metallurgical Industry of the People's Republic of China. This standard is drafted by Shaanxi Iron and Steel Research Institute. The main drafter of this standard is Zhang Li.
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