GB/T 14989-1994 Iron-Cobalt-Vanadium Permanent Magnet Alloy GB/T14989-1994 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Iron-cobalt-vanadlum
permanent-magnet alloyswww.bzxz.net
GB/T14989—94
Replaces GBn-172--82
This standard applies to cold-drawn wire and cold-rolled strip of iron-cobalt-vanadlum alloy for making small-surface permanent magnets and recording materials. 1 Dimensions and appearance
1.1 Dimensions and allowable deviations
1.1.1 The diameter of cold-drawn wire and its allowable deviation shall comply with the provisions of Table 1. Table 1
>1.0 ~2.0
>2.0 ~3.0
1.1,2 The dimensions of cold-rolled strip and its allowable deviation shall comply with the provisions of Table 2. Table 2
0.20 ~0.40
>0.40~0.60
>0.600.80
Allowable deviation
Allowable deviation
Allowable deviation
1.1.3 According to the requirements of the purchaser, after negotiation between the supply and demand parties, cold-rolled strips with sizes other than those in Table 2 can be supplied. 1.2 Appearance
The ovality of the wire shall not exceed half of the tolerance. The wire shall not have a "" shape.
1.3 Marking example
2J31 cold drawn wire with a diameter of 0.5m is marked as: cold wire 2J31-0.5—GB/T14989-94
Approved by the State Technical Supervision Commission on April 4, 1994
Not less than
Implementation on May 1, 1994
GB/T14989-94
2J32 cold rolled strip with a thickness of 0.20mm and a width of 50mm is marked as: cold strip 2J32—0.20×50—GB/T14989--942 Technical requirements
2.1 Grade and chemical composition
The alloy grade and chemical composition shall comply with the provisions of Table 3. When the magnetic properties of the alloy meet the requirements of this standard, the chemical composition is allowed to deviate from the range specified in Table 3.
Chemical composition:
Alloy grade
Not more than
10.8~11.7
11.8~12.7
12.8~13.8
2.2 Smelting method
The alloy is smelted in a vacuum induction furnace or a non-vacuum induction furnace. Other smelting methods that can meet the requirements of this standard can also be used. 2.3 Delivery status
Alloy cold-drawn wire and cold-rolled strip are delivered without heat treatment. 2.4 Magnetic properties
2.4.1 After heat treatment, the magnetic properties of the alloy sample shall comply with the requirements of Table 4. Table 4
Coercive force He
Alloy grade
(kA/m)
Residual magnetic induction Br
not less than
Br· He
Gs·Oe
Coercive force He
(kA/m)
（23.88）
Residual magnetic induction Br
not less than
Gs + O:
2,4×108
GR/T 14989—94
While ensuring that the product of coercive force Hc and residual magnetic induction Br is not less than the values ​​specified in Table 4, the coercive force Hc is allowed to decrease by 10% or the residual magnetic induction Br is allowed to decrease by 5%.
2.4.2 The manufacturer shall provide the maximum magnetic energy product (BH) m8x data, which shall not be used as the basis for assessment. 2.5 Surface quality
2.5.1 The surface of the wire shall be smooth and clean, and no cracks, scars, pitting or severe scratches are allowed. Individual spots, slight scratches and abrasions are allowed without affecting the use. 2.5.2 The surface of the cold-rolled strip shall be smooth and clean, and no cracks, layers, scars or coarse burrs are allowed. Local small scars, slight scratches, indentations and pitting are allowed without affecting the use. However, these defects shall not exceed the deviation of the finished product thickness. 8 Test methods
The test methods and sampling locations for various quality inspections of alloy materials shall comply with the provisions of Table 5. Table 5
Inspection rules
4.1 Inspection and acceptance
Inspection items
Chemical composition
Magnetic properties
Surface quality
Test method
YB 789-75, YB 35—78
Impact method or loop instrument method
Use measuring tools that can ensure accuracy
The inspection and acceptance of alloy materials shall be carried out by the supplier's technical supervision department. Sampling location
GB 222—63
Any sampling on the finished product
Sampling quantity
One piece per furnace
Two pieces per batch
4.2 Batch rules
Alloy materials shall be submitted for inspection and acceptance in batches. Each batch shall consist of wires or strips of the same alloy grade, the same smelting furnace number, the same cross-sectional dimensions and the same processing method.
4.8 Sampling quantity
The sampling quantity for quality inspection of alloy wires or strips shall comply with the provisions of Table 5. 4.4 Re-inspection and judgment rules
When the magnetic property inspection results of alloy materials are unqualified, two samples are allowed to be re-taken for re-inspection. If the re-inspection results are still unqualified, the batch of alloys will not be accepted. However, the supplier may change the heat treatment system and resubmit it for inspection as a new batch. 5 Packaging, marking and quality certificate
The packaging, marking and quality certificate of alloy materials shall comply with the requirements of YB/T5242-.93 "General Provisions for Packaging, Marking and Quality Certificates of Precision Alloys".
GB/T14989—94
Appendix A
Preparation and testing of magnetic measurement samples
(Supplement)
A.1 The sample should be cut into a wire segment with a length of 40mm or a strip with a width of 5-8mm and a length of 40mm along the processing direction. The two end faces of the wire segment or strip sample should be parallel to each other and perpendicular to the axis. The cross section of the sample should remain consistent along the entire length, and its deviation should not exceed 1% of its minimum cross-sectional area.
2 After heat treatment, the sample is measured in a magnetic field greater than 2000Oe (159.16kA/m). A.2
GB/T14989—94
Appendix B
Heat treatment system for alloy samples
(Reference)
The heat treatment system for alloy samples is recommended to be carried out using the process specified in Table B. Table B
Alloy grade
Additional instructions:
Tempering temperature,
580~640
This standard is proposed by the Ministry of Metallurgical Industry of the People's Republic of China. This standard was drafted by Shaanxi Iron and Steel Research Institute. The main drafter of this standard is Liu Shu.
Insulation time, min
Cold force type
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