GB/T 14988-1994 Hysteresis alloy cold-rolled strip GB/T14988-1994 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Cold-rolled strips for hysteresis alloys
Cold-rolled strips for hysteresis alloys This standard applies to cold-rolled strips of hysteresis alloys used for making rotors of magnetic motors. 1 Dimensions
1.1 Dimensions and their allowable deviations
The dimensions and allowable deviations of cold-rolled strips shall comply with the provisions of Table 1. Table 1
0.20 ~0.40
>0.40~0.60
>0.60~0.80
Allowable deviation
50~120
Allowable deviation
GB/T 14988—94
Genesis GBn 171--82
Not less than
Cold-rolled strips with dimensions other than those specified in Table 1 may be supplied upon request of the purchaser and after negotiation between the supply and demand parties. 1.2 Marking example
2,4 cold-rolled strip with a thickness of 0.20 mm and a width of 50 mm is marked as cold strip 2 J 4 —0.20 × 50 -- GB/T 14988 --942 Technical requirements
2.1 Grade and chemical composition
The grade and chemical composition of the cold-rolled strip shall comply with the provisions of Table 2. 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 2.
2』11
is not greater than
0.700.0250.020
0.0250.020
0.120.700.0250.020
0.12 0. 70 0. 0250. 020 | |tt | 53
3.50 ~4.505.30 ~6.70
6.50~7.50
9.50~10.5
10.5-11.5
11.5~12.5
11.0~13.0
15.0~17.0
0.030.500.0300.03011.5~12.5
Note: In 2J53 alloy, 1.30~1.70% vanadium is allowed to replace an equal amount of molybdenum. Approved by the State Technical Supervision Bureau on April 4, 1994 0.70
14.0~15.0
5. 00 ~6. 00
3.00~4.0012.50~3.50
Implemented on May 1, 1994
2.2 Smelting Method
GB/T14988-94
The alloy is smelted by vacuum induction furnace or non-vacuum induction furnace, and other smelting methods that can meet the requirements of this standard can also be used. 2.3 Delivery Status
Cold-rolled strip is delivered without heat treatment.
2.4 Hysteresis Performance
After the cold-rolled strip sample is heat-treated, the hysteresis performance shall meet the requirements of Table 3. Table 3
fip, Oe
50 ~ 65
80~120bZxz.net
110~150
180-230
200~266
250~50
35 ~ 50
80~150
2.5Surface quality
13000~16000
IU000~13000
9000~12500
900012000
9000～12000
000～11000
12000～16000
9000~13500
6000~9000
Pp, erg/cm?
not less than
The surface of the cold-rolled strip should be smooth and flat, and cracks, interlayers, scars and coarse burrs are not allowed. Without affecting the use, the surface is allowed to have local small scars, slight scratches, dents and pits. However, these defects should not exceed the deviation of the finished product thickness. 3 Test methods
The test methods and sampling locations for various quality inspections of cold-rolled strips shall comply with the provisions of Table 4. 4
Inspection rules
Inspection items
Chemical composition
Hysteresis properties
Surface quality
Inspection and acceptance
Test methods
YB78975, YB3578
Impact method or loop instrument method
Use measuring tools that can ensure accuracy
The inspection and acceptance of cold-rolled strips shall be carried out by the supply technical supervision department. Sampling location
GB222—63
Taken from the finished product
No sample
One piece per batch
Two pieces per batch
GR/T 14988—94
4.2 Batch rules
Cold-rolled strips shall be submitted for inspection and acceptance in batches. Each batch shall be made up of cold-rolled strips of the same alloy grade, the same smelting furnace number, the same cross-sectional size and the same processing method
4,3 Sampling quantity
The sampling quantity for the quality inspection of cold-rolled strips shall comply with the provisions of Table 4. 4.4 Re-inspection and judgment rules
When the hysteresis performance inspection result of cold-rolled strips is unqualified, two samples are allowed to be taken for re-inspection. If the re-inspection result is still unqualified, the batch of alloys shall not be accepted, but the supplier may change the heat treatment system and re-submit a new batch for inspection. 5 Packaging, marking and quality certificate
The packaging, marking and quality certificate of cold-rolled strip shall comply with the requirements of GBn112-81 "General provisions for packaging, marking and quality certificate of precision alloys".
A.1 Sample preparation
GB/T 14988-94
Appendix A
Preparation of magnetic boiling alloy samples and test and calculation methods of hysteresis parameters (supplement)
A,1.1 The sample shall be made into a ring with an outer diameter of 40mm and an inner diameter of 32mm. Other ring sizes with a ratio of average diameter to radial width greater than or equal to 8 may also be used. The stacking thickness of the ring sample shall not be less than 1mmA,1.2 The sample shall be flat, clean and free of burrs. After heat treatment, the oxide scale shall be removed. A.2 Testing and calculation method of hysteresis parameters
A.2.1 The cross-sectional area S of the annular specimen is recommended to be calculated using the following formula: S-
Cross-sectional area of ​​the specimen, cm\,
Wherein: Sn-
-sample weight, g,
-average true diameter of the specimen, cm;
Alloy density, g/cm3.
If the above method is not used, a precision ruler can be used to measure the thickness of the specimen piece by piece and calculate the area. A.2.2 The specimen, measuring winding, and magnetizing winding must be insulated. The measuring winding is wound on the inner layer. During the test, first determine Hμ, and then make a hysteresis loop under this magnetic field to obtain other hysteresis parameters. A.2.8
The magnetic transfer parameters of the alloy are calculated according to the following formula: PuSKHKR
Wherein: S
The measured hysteresis loop surface area l, cm\,
Specific hysteresis loss corresponding to the maximum magnetic permeability point, erg/cm°, the coefficient corresponding to the maximum magnetic permeability point!
Huμ-magnetic field intensity corresponding to the maximum magnetic permeability point, OcRu
Magnetic induction intensity corresponding to the maximum magnetic permeability point, G5KH
Magnetic field intensity coordinate calibration coefficient;
Magnetic induction intensity coordinate calibration coefficient.
CB/T14988--94
Appendix B
Heat treatment system of alloy sample
(reference)
The heat treatment system of the alloy is recommended to be carried out by the process specified in the following table. Alloy grade
Tempering temperature,
580660
580-640
580-640
580~640
580~640
675~750
625~720
500~560
Housing time, minl
Cooling method
Other properties of the alloy are listed in the following table
Alloy grade
Additional remarks:
TB/T 14988—94
Appendix C
Other properties of the alloy
(Reference number)
Thermal shadow coefficient (20 ~ 300℃）
10.7×10-6
10.6×10-6
10.6×10 6
11.3×106
11.2×10 6
13.4×10-5
10.9 ×10-6
11.0× 10 5
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 Liu Yushu.
Positive conductivity
μo·tm (air mixed)
Modulus of elasticity
kg/mm2
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