Summary and comparison of main brands and standards of sintered NdFeB in the world

Sintered NdFeB magnet is a “magnet king” with a wide range of applications, superior magnetic properties, and high cost performance in magnetic materials. It is widely used in industry, manufacturing and high-tech industries. China is the world’s largest producer and exporter of sintered NdFeB. In 2018, China produced about 155,000 tons of sintered NdFeB blanks, and exported about 33,000 tons of NdFeB magnets to six continents in the world. Many countries, of which Germany, Japan and the United States are China’s largest exporters of rare earth permanent magnets.
Sintered NdFeB is widely used around the world, and countries have different regulations on the grade and performance requirements of sintered NdFeB. Today, yueci will take you to learn about the national standards of sintered NdFeB by our major trading countries.

Current sintered NdFeB standards in major countries

Standard code Issuing agency Implementation time Remarks
International standard IEC 60404-8-1:2015 IEC International Electrotechnical Commission 2015
EU standards EN 60404-8-1:2015 EN European Standards Committee 2015 Consistent with the IEC standard, which is used in the UK and Germany
Chinese standard GB/T 13560-2017 National Standards Committee of China Quality Inspection Bureau 2018
American standard ASTM A1101 − 16 ASTM American Society for Testing and Materials 2016 The United States uses both IEC standards and ASTM standards, in addition to MMPA and EEE standards.
Japanese standard JIS C 2502:2019 Japan Institute of Technology Standards Committee 2019

Globally, the mainstream international standard for sintered NdFeB is IEC 60404-8-1 designated by the International Electrotechnical Commission (IEC), and the latest version is the 2015 version. The articles on the comparison of NdFeB grade standards at home and abroad are still using the 2005 edition or even the 1998 edition, please pay special attention to the timeliness of the edition). IEC is the first international electrotechnical standardization organization established in the world, and it is also one of the three major global standards organizations (the other two are the International Organization for Standardization ISO and the International Telecommunication Union ITU).
The European Union’s standards for sintered NdFeB are basically the same as the IEC standards. Countries such as the United Kingdom and Germany use the European Union standard EN 60404-8-1:2015, but the standards of each country have some adjustments in the file format and language, such as the United Kingdom The standard is BS EN 60404-8-1:2015, and the German standard is DIN EN60404-8-1:2015.

Magnetic properties and densities of REFeB magnets (IEC 60404-8-1:2015)

China
grade e+
Brief designation
Code
number
Maximum
BH
product
Remanent
flux
density
Coercivity Coercivity
Relative
recoil
permeability
Density
(BH)max Br HcB HcJ μrec ρ
kJ/m3 mT kA/m kA/m Mg/m3
N/A REFeB 170/190 R7-1-1 170 980 700 1900 1.05
7.5
to
7.7
N28H REFeB 210/130 R7-1-2 210 1060 790 1300
N33M REFeB 250/120 R7-1-3 250 1130 840 1200
N38 REFeB 290/80 R7-1-4 290 1230 700 800
N28UH REFeB 200/190 R7-1-5 200 1060 760 1900
N33SH REFeB 240/180 R7-1-6 240 1160 840 1800
N38M REFeB 280/120 R7-1-7 280 1240 900 1200
N42 REFeB 320/88 R7-1-8 320 1310 800 880
N28EH REFeB 210/240 R7-1-9 210 1060 760 2400
N33UH REFeB 240/200 R7-1-10 240 1160 840 2000
N42H REFeB 310/130 R7-1-11 310 1300 900 1300
N33EH REFeB 250/240 R7-1-12 250 1200 830 2400
N35UH REFeB 260/200 R7-1-13 260 1210 840 2000
N45H REFeB 340/130 R7-1-14 340 1330 920 1300
N45 REFeB 360/90 R7-1-15 360 1350 800 900
N50 REFeB 380/100 R7-1-16 380 1420 990 1000
* e+ = equal
or superior
Typical values of the parameters:
  • Temperature coefficient of remanence α(Br) = -0.1 %/°C to -0.12 %/°C (for 20 °C to 100 °C);
  • Temperature coefficient of coercivity α(HcJ) = -0.45 %/°C to -0.6 %/°C (for 20 °C to 100 °C);
  • Curie temperature: 310 °C.
  • Maximum opertating temperature: 200 °C.

China’s current national standard for sintered NdFeB is GB/T 13560-2017, issued by the General Administration of Quality Supervision, Inspection and Quarantine and the National Standardization Management Committee, and will be implemented in May 2018. There are 1992 editions, 2000 editions and 2009 editions in history, all of which are now abolished. The normative references disclosed in my country’s sintered NdFeB national standards do not include IEC international standards. That is to say, although my country is also a member of IEC, the formulation of our NdFeB national standards mainly considers domestic status and Usage habits, no reference to international standards.

Sintered NdFeB Magnets’ Grades and Their Magnetic Properties (GB/T 13560-2017)

Grade Br Hcb Hcj (BH)max Tw
kGs T kOe kA/m kOe kA/m MGOe kJ/m3 ºC
N52 14.2-14.8 1.42-1.48 ≥10.5 ≥836 ≥11 ≥876 50-53 398-422 ≤80
N50 13.9-14.4 1.39-1.44 ≥10.8 ≥859 ≥12 ≥955 48-51 382-406
N48 13.6-14.1 1.36-1.41 ≥11.6 ≥923 46-49 366-390
N45 13.2-13.7 1.32-1.37 ≥11.6 ≥923 43-46 342-366
N42 12.8-13.3 1.28-1.33 ≥11.4 ≥907 40-43 318-342
N40 12.4-12.9 1.24-1.29 ≥11.4 ≥907 38-41 302-326
N38 12.1-12.6 1.21-1.26 ≥11.2 ≥891 36-39 286-310
N35 11.7-12.2 1.17-1.22 ≥10.8 ≥859 33-36 263-286
N33 11.3-11.8 1.13-1.18 ≥10.5 ≥836 31-34 247-271
N30 10.8-11.3 1.08-1.13 ≥10.0 ≥796 28-31 223-247
N50M 13.9-14.4 1.39-1.44 ≥13.0 ≥1035 ≥13 ≥1035 48-51 382-406 ≤100
N48M 13.6-14.1 1.36-1.41 ≥12.8 ≥1019 ≥14 ≥1114 46-49 366-390
N45M 13.2-13.7 1.32-1.37 ≥12.5 ≥995 43-46 342-366
N42M 12.8-13.3 1.28-1.33 ≥12.0 ≥955 40-43 318-342
N40M 12.4-12.9 1.24-1.29 ≥11.6 ≥923 38-41 302-326
N38M 12.1-12.6 1.21-1.26 ≥11.3 ≥899 36-39 286-310
N35M 11.7-12.2 1.17-1.22 ≥10.9 ≥867 33-36 263-286
N33M 11.3-11.8 1.13-1.18 ≥10.5 ≥836 31-34 247-271
N30M 10.8-11.3 1.08-1.13 ≥10.0 ≥796 28-31 223-247
N50H 13.9-14.4 1.39-1.44 ≥13.0 ≥1035 ≥16 ≥1273 48-51 382-406 ≤120
N48H 13.6-14.1 1.36-1.41 ≥12.8 ≥1019 ≥17 ≥1353 46-49 366-390
N45H 13.2-13.7 1.32-1.37 ≥12.5 ≥995 43-46 342-366
N42H 12.8-13.3 1.28-1.33 ≥12.0 ≥955 40-43 318-342
N40H 12.4-12.9 1.24-1.29 ≥11.6 ≥923 38-41 302-326
N38H 12.1-12.6 1.21-1.26 ≥11.3 ≥899 36-39 286-310
N35H 11.7-12.2 1.17-1.22 ≥10.9 ≥867 33-36 263-286
N33H 11.3-11.8 1.13-1.18 ≥10.5 ≥836 31-34 247-271
N30H 10.8-11.3 1.08-1.13 ≥10.0 ≥796 28-31 223-247
N48SH 13.6-14.1 1.36-1.41 ≥12.8 ≥1019 ≥20 ≥1592 46-49 366-390 ≤150
N45SH 13.2-13.7 1.32-1.37 ≥12.5 ≥995 43-46 342-366
N42SH 12.8-13.3 1.28-1.33 ≥12.0 ≥955 40-43 318-342
N40SH 12.4-12.9 1.24-1.29 ≥11.6 ≥923 38-41 302-326
N38SH 12.1-12.6 1.21-1.26 ≥11.3 ≥899 36-39 286-310
N35SH 11.7-12.2 1.17-1.22 ≥10.9 ≥867 33-36 263-286
N33SH 11.3-11.8 1.13-1.18 ≥10.5 ≥836 31-34 247-271
N30SH 10.8-11.3 1.08-1.13 ≥10.0 ≥796 28-31 223-247
N42UH 12.8-13.3 1.28-1.33 ≥12.2 ≥971 ≥25 ≥1990 40-43 318-342 ≤180
N40UH 12.4-12.9 1.24-1.29 ≥11.8 ≥939 38-41 302-326
N38UH 12.1-12.6 1.21-1.26 ≥11.5 ≥915 36-39 286-310
N35UH 11.7-12.2 1.17-1.22 ≥11.1 ≥883 33-36 263-286
N33UH 11.3-11.8 1.13-1.18 ≥10.7 ≥851 31-34 247-271
N30UH 10.8-11.3 1.08-1.13 ≥10.2 ≥812 28-31 223-247
N40EH 12.4-12.9 1.24-1.29 ≥11.8 ≥939 ≥30 ≥2388 38-41 302-326 ≤200
N38EH 12.1-12.6 1.21-1.26 ≥11.5 ≥915 36-39 286-310
N35EH 11.7-12.2 1.17-1.22 ≥11.1 ≥883 33-36 263-286
N33EH 11.3-11.8 1.13-1.18 ≥10.7 ≥851 31-34 247-271
N30EH 10.8-11.3 1.08-1.13 ≥10.2 ≥812 28-31 223-247
N35AH 11.7-12.2 1.17-1.22 ≥11.1 ≥883 ≥35 ≥2786 33-36 263-286 ≤230
N33AH 11.3-11.8 1.13-1.18 ≥10.7 ≥851 31-34 247-271
N30AH 10.8-11.3 1.08-1.13 ≥10.2 ≥812 28-31 223-247
N28AH 10.4-10.9 1.04-1.09 ≥9.8 ≥780 26-29 207-231
Note:
  • The data in the above table were samples’ results tested at the temperature of 20 °C.
  • The temperature coefficients of Br and Hcj are α(Br): -0.09~-0.12 %/ºC and β(Hcj): -0.40~-0.60 %/ºC, respectively.
  • The above data are only for reference, magnets can be tailored according to customers’ personalized requirements.

The United States uses both IEC 60404-8-1:201 and ASTM A1101 – 16. ASTM is the abbreviation of the American Society for Testing and Materials. In addition, the United States also uses the NdFeB standard specified by the MMPA Magnetic Material Production Association and the IEEE Institute of Electrical and Electronics Engineers.

American sintered NdFeB standard: A1101 − 16

ASTM Designation B
Maximum
Energy Product
(BH)max
Residual
Induction
Br
Coercive Field
Strength
HcB
Intrinsic Coercive
Field Strength
HcJ
kJ/m3 (MGOe) mT (G)  kA/m (Oe) kA/m (Oe)
ANISOTROPIC Nd2Fe14B
ND-SA-333/875 333(41.8) 1325(13250) 832(10450) 875(11000)
ND-SA-355/875 355(44.6) 1369(13690) 832(10450) 875(11000)
ND-SA-370/875 370(46.5) 1397(13970) 832(10450) 875(11000)
ND-SA-385/875 385(48.4) 1426(14260) 832(10450) 875(11000)
ND-SA-407/875 407(51.1) 1465(14650) 832(10450) 875(11000)
ND-SA-222/955 222(27.9) 1082(10820) 820(10300) 955(12000)
ND-SA-244/955 244(30.7) 1136(11360) 861(10820) 955(12000)
ND-SA-259/955 259(32.5) 1168(11680) 907(11400) 955(12000)
ND-SA-281/955 281(35.3) 1218(12180) 907(11400) 955(12000)
ND-SA-296/955 296(37.2) 1250(12500) 907(11400) 955(12000)
ND-SA-311/955 311(39.1) 1281(12810) 907(11400) 955(12000)
ND-SA-333/955 333(41.8) 1325(13250) 907(11400) 955(12000)
ND-SA-355/955 355(44.6) 1369(13690) 907(11400) 955(12000)
ND-SA-370/955 370(46.5) 1397(13970) 907(11400) 955(12000)
ND-SA-385/955 385(48.4) 1426(14260) 907(11400) 955(12000)
ND-SA-222/1114 222(27.9) 1082(10820) 820(10300) 1114(14000)
ND-SA-244/1114 244(30.7) 1136(11360) 861(10820) 1114(14000)
ND-SA-259/1114 259(32.5) 1168(11680) 885(11120) 1114(14000)
ND-SA-281/1114 281(35.3) 1218(12180) 923(11600) 1114(14000)
ND-SA-296/1114 296(37.2) 1250(12500) 947(11900) 1114(14000)
ND-SA-311/1114 311(39.1) 1281(12810) 971(12200) 1114(14000)
ND-SA-333/1114 333(41.8) 1325(13250) 1004(12620) 1114(14000)
ND-SA-355/1114 355(44.6) 1369(13690) 1058(13300) 1114(14000)
ND-SA-370/1114 370(46.5) 1397(13970) 1058(13300) 1114(14000)
ND-SA-385/1114 385(48.4) 1426(14260) 1058(13300) 1114(14000)
ND-SA-207/1353 207(26.0) 1045(10450) 792(9950) 1353(17000)
ND-SA-222/1353 222(27.9) 1082(10820) 820(10300) 1353(17000)
ND-SA-244/1353 244(30.7) 1136(11360) 861(10820) 1353(17000)
ND-SA-259/1353 259(32.5) 1168(11680) 885(11120) 1353(17000)
ND-SA-281/1353 281(35.3) 1218(12180) 923(11600) 1353(17000)
ND-SA-296/1353 296(37.2) 1250(12500) 947(11900) 1353(17000)
ND-SA-311/1353 311(39.1) 1281(12810) 971(12200) 1353(17000)
ND-SA-333/1353 333(41.8) 1325(13250) 1004(12620) 1353(17000)
ND-SA-355/1353 355(44.6) 1369(13690) 1038(13040) 1353(17000)
ND-SA-370/1353 370(46.5) 1397(13970) 1058(13300) 1353(17000)
ND-SA-207/1592 207(26.0) 1045(10450) 792(9950) 1592(20000)
ND-SA-222/1592 222(27.9) 1082(10820) 820(10300) 1592(20000)
ND-SA-244/1592 244(30.7) 1136(11360) 861(10820) 1592(20000)
ND-SA-259/1592 259(32.5) 1168(11680) 885(11120) 1592(20000)
ND-SA-281/1592 281(35.3) 1218(12180) 923(11600) 1592(20000)
ND-SA-296/1592 296(37.2) 1250(12500) 947(11900) 1592(20000)
ND-SA-311/1592 311(39.1) 1281(12810) 971(12200) 1592(20000)
ND-SA-333/1592 333(41.8) 1325(13250) 1004(12620) 1592(20000)
ND-SA-355/1592 355(44.6) 1369(13690) 1038(13040) 1592(20000)
ND-SA-207/1989 207(26.0) 1045(10450) 792(9950) 1989(25000)
ND-SA-222/1989 222(27.9) 1082(10820) 820(10300) 1989(25000)
ND-SA-244/1989 244(30.7) 1136(11360) 861(10820) 1989(25000)
ND-SA-259/1989 259(32.5) 1168(11680) 885(11120) 1989(25000)
ND-SA-281/1989 281(35.3) 1218(12180) 923(11600) 1989(25000)
ND-SA-296/1989 296(37.2) 1250(12500) 947(11900) 1989(25000)
ND-SA-311/1989 311(39.1) 1281(12810) 971(12200) 1989(25000)
ND-SA-333/1989 333(41.8) 1325(13250) 1004(12620) 1989(25000)
ND-SA-207/2387 207(26.0) 1045(10450) 792(9950) 2387(30000)
ND-SA-222/2387 222(27.9) 1082(10820) 820(10300) 2387(30000)
ND-SA-244/2387 244(30.7) 1136(11360) 861(10820) 2387(30000)
ND-SA-259/2387 259(32.5) 1168(11680) 885(11120) 2387(30000)
ND-SA-281/2387 281(35.3) 1218(12180) 923(11600) 2387(30000)
ND-SA-207/2785 207(26.0) 1045(10450) 792(9950) 2785(35000)
ND-SA-222/2785 222(27.9) 1082(10820) 820(10300) 2785(35000)
ND-SA-244/2785 244(30.7) 1136(11360) 861(10820) 2785(35000)
A Magnetic properties at 20 °C (68 °F).
B The ASTM designation conforms to the requirements of this specification. ASTM Designations are of the form MM-TT-XX/YY where:
  • MM = material (ND = neodymium iron boron);
  • TT = type of processing and orientation (S = sintered; I = isotropic (non-oriented), A = anisotropic (oriented));
  • XX = energy product in kJ/m3 rounded to the nearest integer;
  • YY = intrinsic coercivity in kA/m rounded to the nearest integer.

The current national standard for sintered NdFeB in Japan is JIS C 2502 2019 issued by the Japan Institute of Technology and the Japanese Standards Committee. The standard is formulated with reference to the IEC standard, but there are more grades with higher performance than the IEC standard, and some IECs are eliminated. Grades with lower performance in the standard.

Japanese sintered NdFeB standard: JIS C 2502 2019

Material name Manufacturing method Magnetic characteristics
Name Magnetic anisotropy a) Code number Maximum energy product Residual magnetic flux density Coercivity Intrinsic coercivity Relative recovery permeability Density
(BH)max Br HcB HcJ µrec ρ
kJ/m3 mT kA/m kA/m Mg/m3
REFeB Minimum value Nominal value Minimum value Nominal value Minimum value Nominal value Minimum value Nominal value Representative value
REFeB 240/180 a R7-1-6 Sintered 240 256 1160 1210 840 920 1800 1960 1.05 7.5-7.7
REFeB 280/120 a R7-1-7 280 296 1240 1290 900 980 1200 1360
REFeB 320/88 a R7-1-8 320 336 1310 1360 800 1000 880 1040
REFeB 210/240 a R7-1-9 210 226 1060 1110 760 840 2400 2560
REFeB 240/200 a R7-1-10 240 256 1160 1 210 840 920 2000 2160
REFeB 310/130 a R7-1-11 310 326 1300 1 350 900 1020 1300 1460
REFeB 250/240 a R7-1-12 250 266 1200 1 250 830 950 2400 2560
REFeB 260/200 a R7-1-13 260 276 1210 1 260 840 960 2000 2160
REFeB 340/130 a R7-1-14 340 356 1330 1 380 920 1050 1300 1460
REFeB 360/90 a R7-1-15 360 376 1350 1 400 800 1020 900 1060
REFeB 380/100 a R7-1-16 380 396 1420 1 470 990 1120 1000 1160
REFeB 290/200 a R7-1-17 290 306 1220 1 270 920 970 2000 2160
REFeB 310/170 a R7-1-18 310 326 1270 1 320 960 1010 1700 1860
REFeB 350/130 a R7-1-19 350 366 1350 1 400 1000 1070 1300 1460
Representative characteristic value:
Temperature coefficient of residual magnetic flux density α (Br) = −0.12% / ° C to −0.09% / ° C (20 ° C to 100 ° C)
Temperature coefficient of intrinsic coercive force α (HcJ) = −0.70% / ° C to −0.45% / ° C (20 ° C to 100 ° C)
Curie temperature: 310 
Maximum operating temperature: 200 ° C

Note

a) a = shows anisotropy. 

b) Recoil relative permeability is defined by JIS C 2501 equation (9).

Now that we have found the sintered NdFeB standards of our major trading countries, we might as well put them together for comparison. In the figure below, the horizontal axis represents the remanence and the vertical axis represents the intrinsic coercivity. Brand products are placed in the coordinate system one by one. You can find many interesting conclusions by comparing in the figure.

20210126070527 11466 - Summary and comparison of main brands and standards of sintered NdFeB in the world

Among the national standards, the American ASTM standard has the most product brands, followed by my country’s GB/T 13560-2017; and the IEC international standard has the least number of brands.
From the point of view of performance requirements, my country’s standards are relatively close to the American ASTM standards. Under the same intrinsic coercivity, the remanence requirements of Chinese products are higher. There is currently no brand with similar performance to my country’s TH series sintered NdFeB in IEC international standards and Japanese national standards.
Source: China Permanent Magnet Manufacturer – www.ymagnet.com

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