Neodymium Iron Boron (Nd-Fe-B) Magnet Material Grades

More About Neodymium Iron Boron

Click on a grade below to view its demagnetization curve.

Grade	Maximum Energy Product BHmax	Residual Induction Br	Minimum Intrinsic Coercivity Hci	Coercivity Hc	Maximum Operating Temp Tmo	Curie Temp Tc	Coefficient Induction 20-150 °C α	Coefficient Coercivity 20-150 °C β
	MGOe	kG	kOe	kOe	°C	°C	% / °C	% / °C
N5211	52	14.5	11	10.6	50	310	-0.12	-.065
N5011	50	14.3	11	10.6	50	310	-0.12	-0.63
N4811	48	13.9	11	10.6	50	310	-0.12	-0.63
N4511	45	13.6	11	10.5	50	310	-0.12	-0.63
N4812	48	14.0	12	11.4	80	310	-0.12	-0.63
N4512	45	13.5	12	11.3	80	310	-0.12	-0.63
N4212	42	13.5	12	11.2	80	310	-0.12	-0.63
N4012	40	12.8	12	11.1	80	310	-0.12	-0.63
N3812	38	12.4	12	10.9	80	310	-0.12	-0.63
N3512	35	12.0	12	10.8	80	310	-0.12	-0.63
N5014	50	14.2	14	12.6	80	310	-0.12	-0.63
N4814	48	13.9	14	12.4	80	310	-0.12	-0.63
N4514	45	13.6	14	12.3	80	310	-0.12	-0.63
N4214	42	13.1	14	12.1	80	310	-0.12	-0.63
N4014	40	12.8	14	11.8	80	310	-0.12	-0.63
N3814	38	12.4	14	11.5	80	310	-0.12	-0.63
N3514	35	12.6	14	11.3	80	310	-0.12	-0.63
N3314	33	11.6	14	10.9	80	310	-0.12	-0.63
N4816	48	13.8	16	12.9	100	320	-0.11	-0.61
N4516	45	13.7	16	12.8	100	320	-0.11	-0.61
N4216	42	13.1	16	12.4	100	320	-0.11	-0.61
N3616	36	12.2	16	11.6	100	320	-0.11	-0.61
N3216	32	11.4	16	10.9	100	320	-0.11	-0.61
N4517	45	13.4	17	12.7	120	320	-0.11	-0.60
N4217	42	13.0	17	12.4	120	320	-0.11	-0.60
N4017	40	12.8	17	12.3	120	320	-0.11	-0.60
N3817	38	12.4	17	11.9	120	320	-0.11	-0.60
N3517	35	12.0	17	11.5	120	320	-0.11	-0.60
N3317	33	11.6	17	11.2	120	320	-0.11	-0.60
N3017	30	11.0	17	10.6	120	320	-0.11	-0.60
N4220	42	13.0	20	12.5	150	330	-0.11	-0.58
N4020	40	12.8	20	12.4	150	330	-0.11	-0.58
N3820	38	12.4	20	12.0	150	330	-0.11	-0.58
N3520	35	12.0	20	11.6	150	330	-0.11	-0.58
N3320	33	11.6	20	11.3	150	330	-0.11	-0.58
N3020	30	11.1	20	10.8	150	330	-0.11	-0.58
N4221	42	13.0	21	12.5	150	330	-0.11	-0.55
N4021	40	12.8	21	12.4	150	330	-0.11	-0.55
N3821	38	12.6	21	12.3	150	330	-0.11	-0.55
N3521	35	11.9	21	11.5	150	330	-0.11	-0.55
N3021	30	11.1	21	10.8	150	330	-0.11	-0.55
N3825	38	12.5	25	12.2	180	340	-0.10	-0.55
N3525	35	12.0	25	11.6	180	340	-0.10	-0.55
N3325	33	11.6	25	11.3	180	340	-0.10	-0.55
N3025	30	11.1	25	10.8	180	340	-0.10	-0.55
N2825	28	10.6	25	10.4	180	340	-0.10	-0.55
N3830	38	12.5	30	12.2	200	360	-0.08	-0.55
N3530	35	12.0	30	11.7	200	360	-0.08	-0.55
N3330	33	11.6	30	11.4	200	360	-0.08	-0.55
N3030	30	11.0	30	10.7	200	360	-0.08	-0.55
N2830	28	10.7	30	10.5	200	360	-0.08	-0.55

 

Typical Physical Properties
Curie Temperature	320 - 380°C
*Coefficient of Thermal Expansion - Perpendicular to magnetization orientation	-1.0 - -3.0 x 10-6 °C-1
*Coefficient of Thermal Expansion - Parallel to magnetization orientation	+5.0 - +8.0 x 10-6 °C-1
Electrical Resistivity	120 - 160 µΩ·cm
Density	7.4 - 7.8 g·cm-3
Vicker's Hardness	550 - 650 HV
Young's Modulus	150 - 170 kN·mm-2
Bending Strength	0.18 - 0.29 kN·mm-2
Compressive Strength	0.8 - 1.0 kN·mm-2

*Due to magnetostriction, all magnetic materials expand/contract at different rates, depending on magnetic orientation.

About Neodymium Iron Boron

Sintered neodymium-iron-boron (Nd-Fe-B) magnets are the most powerful commercialized permanent magnets available today, with maximum energy product ranging from 26 MGOe to 52 MGOe. Nd-Fe-B is the third generation of permanent magnet developed in the 1980s. It has a combination of very high remanence and coercivity, and comes with a wide range of grades, sizes and shapes. With its excellent magnetic characteristics, abundant raw material and relatively low prices, Nd-Fe-B offers more flexibility in designing of new or replace the traditional magnet materials such as ceramic, Alnico and Sm-Co to achieve high efficiency, low cost and more compact devices.

A powder metallurgy process is used in producing sintered Nd-Fe-B magnets. Although sintered Nd-Fe-B is mechanically stronger than Sm-Co magnets and less brittle than other magnets, it should not be used as structural component. Selection of Nd-Fe-B is limited by temperature due to its irreversible loss and moderately high reversible temperature coefficient of Br and Hci. The maximum application temperature is 200 °C for high coercivity grades. Nd-Fe-B magnets are more prone to oxidation than any other magnet alloys. If Nd-Fe-B magnet is to be exposed to humidity, chemically aggressive media such as acids, alkaline solutions salts and harmful gases, coating is recommended. It is not recommended in a hydrogen atmosphere.