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Neodymium Magnet

Neodymium Magnet Manufacturer in Gujarat, India

Discover the power of Neodymium magnets, the strongest permanent magnets available today. Composed of neodymium, iron, and boron, these magnets deliver exceptional magnetic strength, outperforming other types like Samarium Cobalt and Ferrite. As a trusted Neodymium Magnet Manufacturer in Gujarat, India, we provide high-performance magnetic solutions for consumer, commercial, and industrial sectors including automotive, aerospace, engineering, electronics, and food preparation industries. Their compact size and high performance make them perfect for a variety of industrial and commercial applications worldwide.

Designed for durability, Neodymium magnets are typically coated to prevent corrosion, with popular finishes such as NiCuNi, Zinc, and Gold. With 55 different types in use, these versatile magnets are essential in numerous industries, from lighting to motor and generator applications. Being one of the reliable industrial magnet manufacturers in Gujarat, India, we focus on delivering unmatched magnetic strength, reliability, precision engineering, and long-lasting performance. Elevate your projects with the unmatched strength and reliability of Neodymium magnets—your ideal solution for any magnetic need.

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Manufacturing Process of Seprion Neodymium Magnets in Gujarat, India

The manufacturing process of Neodymium magnets begins with the production of an alloy using vacuum melting and the strip-casting (SC) method. As an experienced Neodymium Magnet Manufacturer in Gujarat, India, we follow advanced manufacturing standards and precision engineering processes. The resulting alloy flakes are converted into coarse powder through hydrogen decrepitation, followed by jet milling to produce a fine powder with particle sizes ranging from 3 to 7 microns. This fine powder is then filled into molds and pressed under an applied magnetic field to orient the individual particles. The compacted green body is subsequently Seprion in a vacuum furnace at approximately 1100 degrees Celsius. After sintering, the blanks are machined to the desired shapes, subjected to surface treatment, and magnetized. Our manufacturing facility in Gujarat, India ensures high-quality production standards, consistency, and reliable industrial performance.

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Weighing Neodymium Magnets

Melting And-Strip Casting

Hydrogen Decrepitation

Jet Milling

pressing

Sintering

Machining

Surface Treatment

Magnetization

Packaging and Shipping

Magnetic Properties of Sintered Neodymium Magnets

Neodymium magnet grades are typically specified in the format of the letter N followed by a number and one or two letters. The letter N stands for the abbreviation of the Neodymium element. The subsequent number represents the maximum energy product (BH)max of the magnet in the CGS unit of Mega-Gauss Oersteds (MGOe). As a leading industrial magnet manufacturer in Gujarat, India, we provide high-quality Neodymium magnets for engineering, industrial, and commercial applications. The one or two letters appended at the end indicate the intrinsic coercivity and maximum operating temperature of the Neodymium magnets. The intrinsic coercivity for M (medium), H (high), SH (super high), UH (ultra high), EH (extreme high), and AH (abnormal high) grades should be greater than 14, 17, 20, 25, 30, and 35 kOe respectively, with corresponding maximum operating temperatures reaching 100, 120, 150, 180, 200, and 220 degrees Celsius.

It should be noted that some grades lack a trailing letter, particularly the well-known N35 and N52. For these grades, the intrinsic coercivity is no less than 12 kOe, and the maximum operating temperature should be below 80 degrees Celsius. Furthermore, grades for grain boundary diffused Neodymium magnets incorporate a prefix G to highlight their manufacturing characteristics. Our Neodymium magnet manufacturing facility in Gujarat, India supplies customized magnetic solutions across India and international markets.

Grade Remanence
Br		 Coercivity
Hcb		 Intrinsic Coercivity
Hcj		 Max. Energy Product
(BH)max 		Max. Working
Temperature
T kGs kA/m kOe kA/m kOe kJ/m³ MGOe °C
N30 1.08-1.13 10.8-11.3 ≥798 ≥10.0 ≥955 ≥12 223-247 28-31 80
N33 1.13-1.17 11.3-11.7 ≥836 ≥10.5 ≥955 ≥12 247-271 31-34 80
N35 1.17-1.22 11.7-12.2 ≥868 ≥10.9 ≥955 ≥12 263-287 33-36 80
N38 1.22-1.25 12.2-12.5 ≥899 ≥11.3 ≥955 ≥12 287-310 36-39 80
N40 1.25-1.28 12.5-12.8 ≥907 ≥11.4 ≥955 ≥12 302-326 38-41 80
N42 1.28-1.32 12.8-13.2 ≥915 ≥11.5 ≥955 ≥12 318-342 40-43 80
N45 1.32-1.38 13.2-13.8 ≥923 ≥11.6 ≥955 ≥12 342-366 43-46 80
N48 1.38-1.42 13.8-14.2 ≥923 ≥11.6 ≥955 ≥12 366-390 46-49 80
N50 1.40-1.45 14.0-14.5 ≥796 ≥10.0 ≥876 ≥11 382-406 48-51 80
N52 1.43-1.48 14.3-14.8 ≥796 ≥10.0 ≥876 ≥11 398-422 50-53 80
N55 1.46-1.52 14.6-15.2 ≥796 ≥10.0 ≥876 ≥11 414-430 52-54 80
N35M 1.17-1.22 11.7-12.2 ≥868 ≥10.9 ≥1114 ≥14 263-287 33-36 100
N38M 1.22-1.25 12.2-12.5 ≥899 ≥11.3 ≥1114 ≥14 287-310 36-39 100
N40M 1.25-1.28 12.5-12.8 ≥923 ≥11.6 ≥1114 ≥14 302-326 38-41 100
N42M 1.28-1.32 12.8-13.2 ≥955 ≥12.0 ≥1114 ≥14 318-342 40-43 100
N45M 1.32-1.38 13.2-13.8 ≥995 ≥12.5 ≥1114 ≥14 342-366 43-46 100
N35H 1.17-1.22 11.7-12.2 ≥868 ≥10.9 ≥1353 ≥17 263-287 33-36 120
N42H 1.28-1.32 12.8-13.2 ≥955 ≥12.0 ≥1353 ≥17 318-342 40-43 120
N35SH 1.17-1.22 11.7-12.2 ≥876 ≥11.0 ≥1592 ≥20 263-287 33-36 150
N45SH 1.32-1.38 13.2-13.8 ≥1003 ≥12.6 ≥1592 ≥20 342-366 43-46 150
N35EH 1.17-1.22 11.7-12.2 ≥876 ≥11.0 ≥2388 ≥30 263-287 33-36 200
N38AH 1.22-1.25 12.2-12.5 ≥899 ≥11.3 ≥2786 ≥35 287-310 36-39 230
Grade Remanence
Br		 Coercivity
Hcb		 Intrinsic Coercivity
Hcj		 Max. Energy Product
(BH)max 		Max. Operating
Temperature
Typ. Min. Typ. Min. Min. Typ. Min.
T kGs T kGs kA/m kOe kA/m kOe kA/m kOe kJ/m³ MGOe kJ/m³ MGOe °C
G54H 1.47 14.7 1.45 14.5 1136 14.3 1109 13.9 1353 17 430 54 414 52 120
G52H 1.44 14.4 1.43 14.3 1113 14.0 1090 13.7 1353 17 414 52 398 50 120
G54SH 1.47 14.7 1.45 14.5 1136 14.3 1109 13.9 1592 20 430 54 414 52 150
G52SH 1.44 14.4 1.43 14.3 1113 14.0 1090 13.7 1592 20 414 52 398 50 150
G50SH 1.42 14.2 1.40 14.0 1097 13.8 1071 13.5 1592 20 398 50 382 48 150
G48SH 1.39 13.9 1.37 13.7 1074 13.5 1048 13.2 1592 20 382 48 366 46 150
G45SH 1.35 13.5 1.33 13.3 1043 13.1 1018 12.8 1592 20 358 45 342 43 150
G52UH 1.44 14.4 1.43 14.3 1113 14.0 1090 13.7 1990 25 414 52 398 50 180
G50UH 1.42 14.2 1.40 14.0 1097 13.8 1071 13.5 1990 25 398 50 382 48 180
G48UH 1.39 13.9 1.37 13.7 1074 13.5 1048 13.2 1990 25 382 48 366 46 180
G45UH 1.35 13.5 1.33 13.3 1043 13.1 1018 12.8 1990 25 358 45 342 43 180
G48EH 1.39 13.9 1.37 13.7 1074 13.5 1048 13.2 2389 30 382 48 366 46 200
G45EH 1.35 13.5 1.33 13.3 1043 13.1 1018 12.8 2389 30 358 45 342 43 200
G45AH 1.35 13.5 1.33 13.3 1043 13.1 1018 12.8 2787 35 358 45 342 43 220
G42AH 1.31 13.1 1.29 12.9 1012 12.7 987 12.4 2787 35 334 42 318 40 220
G40AH 1.28 12.8 1.26 12.6 989 12.4 964 12.1 2787 35 318 40 303 38 220
Parameters Unit Reference Range
Temperature Coefficient of Br / α(Br) %/℃ -0.08 ~ -0.13
Temperature Coefficient of Hcj / β(Hcj) %/℃ -0.35 ~ -0.80
Curie Temperature / Tc ℃ 310-380
Recoil Permeability / μrec - 1.05
Physical Properties of Sintered Neodymium Magnets

In addition to their permanent magnetic and chemical properties, the long-term operational stability of Neodymium magnets is closely tied to their physical properties, including mechanical, electrical, and thermal characteristics. As a trusted Neodymium Magnet Manufacturer in Gujarat, India, we ensure every magnet is engineered for superior durability and industrial-grade performance. Mechanical properties are primarily assessed by compressive strength, tensile strength, and bending strength. These metrics significantly influence the machinability and long-term service performance of Neodymium magnets. Electrical properties of metallic materials are measured by electrical resistivity. Neodymium magnets exhibit relatively low electrical resistivity and are susceptible to eddy current losses when used in rotary machinery. Thermal properties of Neodymium magnets are typically characterized by the coefficient of thermal expansion.

Category Parameter Unit Reference Range
Regular Physical Properties Density / ρ g/cm³ 7.40 – 7.80
Vickers Hardness / HV – 550 – 650
Electrical Properties Electrical Resistivity μΩ·m 1.4
Mechanical Properties Compressive Strength MPa 1050
Tensile Strength MPa 80
Bending Strength MPa 290
Thermal Properties Thermal Conductivity W/(m·K) 6 – 8
Coefficient of Thermal Expansion 10⁻⁶/K C⊥: −1.5, C∥: 6.5
Surface Treatments of Sintered Neodymium Magnets

Surface treatment is a necessary procedure for Neodymium magnets. Neodymium magnets possess a multi-phase microstructure, primarily consisting of the Nd2Fe14B main phase, Nd-rich phase, and B-rich phase. Being one of the reliable industrial magnet manufacturers in Gujarat, India, we apply advanced coating and protection technologies to improve corrosion resistance and long-term durability. The Nd-rich phase exhibits a very strong oxidation tendency and forms a galvanic couple with Nd2Fe14B grains in humid environments.

Coating Thickness (μm) Color SST (hrs) PCT (hrs) Characteristics
BW-Zn 4–15 Bright blue ≥24 – Commonly used single-layer coating. Poor anti-corrosion ability.
Color-Zn 4–15 Shining color ≥48 – Better anti-corrosion ability than BW-Zn.
Ni-Cu-Ni 5–20 Bright silver ≥48 ≥48 Most commonly used multi-layer coating. Excellent humidity and salt spray resistance.
Chemical-Ni 5–20 Dark silver ≥72 ≥48 Excellent humidity and salt spray resistance with uniform appearance.
Ni-Cu-Ni-Au 5–20 Golden ≥72 ≥96 Excellent electrical conductivity and decorative finish.
Ni-Cu-Ni-Ag 5–20 Silver ≥72 ≥96 Excellent electrical conductivity and decorative finish.
Ni-Cu-Ni-Sn 5–20 Silver ≥72 ≥96 Excellent humidity resistance.
Phosphate 1–3 Dark grey – – Temporary protection coating.
Aluminum 2–15 Bright silver ≥24 ≥24 Noticeable protective coating.
Epoxy resin 10–30 Black / Grey ≥72 ≥72 Excellent humidity and salt spray resistance. Superior binding force.
Parylene 5–20 Colorless ≥96 – Excellent resistance to humidity, salt spray, corrosive vapors, and solvents. Pore-free coating.
Everlube 10–15 Golden yellow ≥120 ≥72 Excellent humidity resistance.
Teflon 8–15 Black ≥24 ≥24 High-temperature and abrasion resistance. Self-lubricating and 100% waterproof.
Magnetization Directions of Sintered Neodymium Magnets

Most permanent magnets need to be magnetized prior to serving in their specific applications. The magnetization process involves applying an external magnetic field along a specified direction to the permanent magnet to achieve saturation. As an experienced Neodymium Magnet Manufacturer in Gujarat, India, we utilize advanced magnetization systems to ensure accurate magnetic orientation and high-performance output. Neodymium magnets possess relatively high coercivity and therefore require a stronger external magnetic field for saturation. Fast impulse magnetization is the preferred method for Neodymium magnets.

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axially magnetization

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axially multipole magnetization

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diametrically magnetization

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diametrically multipole magnetization

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programmable magnetization

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radially magnetization

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