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Dish NdFeB magnet of 3Cr+Zn coating for Speaker
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Model No.︰ | HTMAG-Dish |
Brand Name︰ | Dish NdFeB |
Country of Origin︰ | China |
Unit Price︰ | US $ 0.03 / pc |
Minimum Order︰ | 50 pc |
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Dish Magnet has been presented above, want more similar products, please click Supper magnets, Disc magnets, Magnetic disc. Our Disc Magnet is good in quality and competitive in price. We manufacture Disc Magnet and supply OEM,ODM service according to your requirement.
The Sintered NdFeB magnet has the high remanence, High coercive force, High-energy productand high pertormance/cost ratio. It may be easily formed into various sizes. And we provide the coating of NdFeB magents can be Ni(NiCuNi,Bright Ni,Chemical Ni,Ni+Epoxy,Ni+Cu,Ni+Sn), Zn(Bluz Zn, Color Zn, White Zn), Gold(Au), Silver(Ag), Phospate, Parylene, etc. we can do the special coating in according to customers request. It is especially suitablefor the development of high performance, compact and light products.
1,Super Sintered NdFeB Magnets Shapes
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Production Process :
Vacuum Melting
Compositions of neodymium, iron , iron-boron, dysprosium and minor additions including cobalt , copper , gallium, aluminum and others are mixed and induce-melted to form Nd2Fe14B phase and other necessary structures required for high performance permanent magnets. The melting temperature reaches over 1300o C. Usually repeated melting is needed to be produce an even phase and structure distribution .
Crushing or HDDR
The ingots from vacuum melting process are crushed into coarse powder directly , or strip cast followed by HDDR processing into coarse powder .
Jet Milling
The coarse powder further milled into required particles sized about 3 microns in diameter by a jet miller . Those particles become single-domain and anisotropic whichare critical for producing a high coercivity magnet. Jet milling is the most effective way to mill the particles so far.
Pressing
Compact the fined powder to re-produces block magnets. Usually a magnetic field is applied during pressing to align those anisotropic particles in order to produces maximum magnetic output in particular direction. There are two pressing methods, transverse and axial , depend on different application. Isostatic pressing is normally used to further densify magnets to 75-80% .
Vacuum Sintering
The compacted magnets are sintered ate temperature above 1000 o C and for many hours to be solidifiedand compacted further more up to 99% by shrinking its body. A required microstructure between particles for high performance permanent magnets is also formed in this stage. Some following heat-treatments are needed to stabilize the magnets .
Machining
Shrinkage and distortion during sintering is too difficult to control adequately and magnets normally need at least a “ clean up” grind on the surface. Small parts are cut or sliced precisely forma big block to meet the demanding tolerances and different shapes .
Surface Treatment
Various surface treatments can be applied on the final products . They include zinc, nickel ,Ni-Cu-Ni multi-layer, e-coating , epoxy and others. They provide different surface finishing, appearance and corrosion resistance, applicable in different application environments.
Inspection & Packaging
Finally, specific inspection varies by customer specification and needs, including dimensional and magnetic tests. Packaging includes rusty-proof , magnetic shelter and others.
Sintered neo magnets is quite brittle and careful handing and packaging is required. |
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3,Surface Treatment
Neodymium magnet is easy corroded in acid , salt and moisture environment due to it’s content of rare earth elements. Uncoated Neodymium Iron Boron should not be used in harsh surrounding and requires a protective layer of coating in order to protect against corrosion . Our magnets offers a variety of different coating suited to the environments of the magnet . The surface treatment usually taken on the magnets is as follows :
1) Metallic Coatings: Zn, Color-Zn, Ni, Double Ni, Ni-Cu-Ni, Ni+Sn
2)Organic Coatings: Black Epoxy and Gray Epoxy
3)Others: Passivation and Phosphatization
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Surface Treatment |
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4,Magnetization of Directions
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5,Technical Data
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Technical data of sintered NdFeB
Performance
Grade |
Br mT(kGs)
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Hcb kA/m(kOe)
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Hcj kA/m(KOe)
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(BH)max kj/m3(MGOe)
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Max working temperature (Tw)
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N35
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1170-1220 (11.7-12.2)
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≥868(≥10.9)
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≥955(≥12)
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263-287(33-36)
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80℃
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N38
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1220-1250 (12.2-12.5)
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≥899(≥11.3)
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≥955(≥12)
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287-310(36-39)
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80℃
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N40
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1250-1280 (12.5-12.8)
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≥907(≥11.4)
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≥955(≥12)
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302-326(38-41)
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80℃
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N42
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1280-1320 (12.8-13.2)
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≥915(≥11.5)
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≥955(≥12)
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318-342(40-43)
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80℃
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N45
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1320-1380 (13.2-13.8)
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≥923(≥11.6)
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≥955(≥12)
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342-366(43-49)
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80℃
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N48
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1380-1420 (13.8-14.2)
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≥923(≥11.6)
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≥955(≥12)
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366-390(46-49)
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80℃
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N50
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1400-1450 (14.0-14.5)
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≥796(≥10.0)
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≥876(≥11)
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382-406(48-51)
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80℃
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33M
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1130-1170 (11.3-11.7)
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≥836(≥10.5)
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≥1114(≥14)
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247-263(31-33)
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100℃
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35M
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1170-1220 (11.7-12.2)
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≥868(≥10.9)
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≥1114(≥14)
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263-287(33-36)
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100℃
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38M
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1220-1250 (12.2-12.5)
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≥899(≥11.3)
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≥1114(≥14)
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287-310(36-39)
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100℃
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40M
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1250-1280 (12.5-12.8)
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≥923(≥11.6)
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≥1114(≥14)
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302-326(38-41)
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100℃
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42M
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1280-1320 (12.8-13.2)
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≥955(≥12.0)
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≥1114(≥14)
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318-342(40-43)
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100℃
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45M
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1320-1380 (13.2-13.8)
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≥995(≥12.5)
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≥1114(≥14)
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342-366(43-46)
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100℃
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48M
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1360-1430 (13.6-14.3)
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≥1027(≥12.9)
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≥1114(≥14)
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366-390(46-49)
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100℃
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33H
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1130-1170 (11.3-11.7)
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≥836(≥10.5)
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≥1353(≥17)
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247-271(31-34)
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120℃
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35H
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1170-1220 (11.7-12.2)
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≥868(≥10.9)
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≥1353(≥17)
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263-287(33-36)
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120℃
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38H
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1220-1250 (12.2-12.5)
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≥899(≥11.3)
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≥1353(≥17)
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287-310(36-39)
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120℃
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40H
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1250-1280 (12.5-12.8)
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≥923(≥11.6)
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≥1353(≥17)
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302-326(38-41)
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120℃
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42H
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1280-1320 (12.8-13.2)
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≥955(≥12.0)
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≥1353(≥17)
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318-342(40-43)
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120℃
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45H
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1320-1380 (13.2-13.8)
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≥955(≥12.0)
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≥1353(≥17)
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342-366(43-46)
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120℃
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48H
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1370-1430 (13.7-14.3)
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≥955(≥12.5)
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≥1353(≥17)
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366-390(46-49)
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120℃
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30SH
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1080-1130 (10.8-11.3)
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≥804(≥10.1)
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≥1592(≥20)
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223-247(28-31)
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150℃
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33SH
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1130-1170 (11.3-11.7)
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≥844(≥10.6)
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≥1592(≥20)
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247-271(31-34)
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150℃
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35SH
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1170-1220 (11.7-12.2)
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≥876(≥11.0)
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≥1592(≥20)
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263-287(33-36)
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150℃
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38SH
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1220-1250 (12.2-12.5)
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≥907(≥11.4)
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≥1592(≥20)
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287-310(36-39)
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150℃
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40SH
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1240-1280 (12.5-12.8)
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≥939(≥11.8)
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≥1592(≥20)
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302-326(38-41)
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150℃
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42SH
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1280-1320 (12.8-13.2)
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≥987(≥12.4)
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≥1592(≥20)
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318-342(40-43)
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150℃
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45SH
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1320-1380 (13.2-13.8)
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≥1003(≥12.6)
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≥1592(≥20)
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342-366(43-46)
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150℃
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28UH
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1020-1080 (10.2-10.8)
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≥764(≥9.6)
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≥1990(≥25)
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207-231(26-29)
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180℃
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30UH
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1080-1130 (10.8-11.3)
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≥812(≥10.2)
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≥1990(≥25)
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223-247(28-31)
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180℃
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33UH
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1130-1170 (11.3-11.7)
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≥852(≥10.7)
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≥1990(≥25)
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247-271(31-34)
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180℃
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35UH
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1180-1220 (11.8-12.2)
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≥860(≥10.8)
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≥1990(≥25)
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263-287(33-36)
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180℃
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38UH
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1220-1250 (12.2-12.5)
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≥899(≥11.3)
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≥1990(≥25)
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287-310(36-39)
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180℃
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40UH
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1240-1280 (12.4-12.8)
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≥899(≥11.3)
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≥1990(≥25)
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302-326(38-41)
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180℃
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28EH
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1040-1090 (10.4-10.9)
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≥780(≥9.8)
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≥2388(≥30)
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207-231(26-29)
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200℃
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30EH
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1080-1130 (10.8-11.3)
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≥812(≥10.2)
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≥2388(≥30)
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223-247(28-31)
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200℃
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33EH
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1130-1170 (11.3-11.7)
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≥836(≥10.5)
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≥2388(≥30)
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247-271(31-34)
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200℃
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35EH
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1170-122 (11.7-12.2)
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≥876(≥11.0)
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≥2388(≥30)
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263-287(33-36)
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200℃
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38EH
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1220-1250 (12.2-12.5)
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≥899(≥11.3)
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≥2388(≥30)
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287-310(36-39)
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200℃
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30AH
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1080-1150 (10.8-11.3)
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≥812(≥10.2)
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≥2786(≥35)
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223-247(28-31)
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250℃
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35AH
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1170-1220 (11.7-12.2)
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≥876(≥11.0)
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≥2786(≥35)
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263-287(33-36)
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250℃
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Besides above-listed magnetic grade, we also have T and L-T series grades magnets which are derived from the basic ones, such as N45 and N45T, 38SH and L-38SHT. The main properties( Br,Hcj,Hcb ad (BH)max) of them are the same while their little differences are listed as follows:
Other Performance Data
Performance
Grade
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μr
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Tc ℃
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Density g/m3
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aBr %/℃
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βHcj %/℃
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Intensity MPa
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Compressive Resistance
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Bending Resistance
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Basic /Grade
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1.05
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310
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7.5
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-0.12
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-0.7
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600-1200
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150-380
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"T" Grade
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1.05
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330
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7.5
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-0.11
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-0.6
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600-1200
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150-380
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"L-T"Grade
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1.05
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350
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7.5
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-0.10
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-0.5
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600-1200
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150-380
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Product Image
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