Name: 3N5（99.95%）NiFe
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3N5（99.95%）NiFe

3N5 High Purity Nickel-Iron Alloy is a precision alloy manufactured from 99.95% pure nickel and iron raw materials through vacuum melting and advanced processing technologies. This material exhibits excellent soft magnetic properties, controlled thermal expansion characteristics, and high corrosion resistance, making it ideal for specialized electronic, magnetic, and precision instrument applications.

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◉ PRODUCT SPECIFICATION

1. Material Standards & Composition

Base Material Standards:

Purity Level: 99.95% (3N5)
Common Standards: ASTM F30, IEC 60404-8-6

Typical Alloy Variants:

NiFe 80/20 (80% Ni, 20% Fe)
NiFe 50/50 (50% Ni, 50% Fe)
NiFe 36/64 (36% Ni, 64% Fe - Invar Type)
Custom compositions available

2. Chemical Composition (% by weight)

Element	Standard Content	Tolerance	Impurity Limits ≤
Ni	36-80%	±0.5%	-
Fe	Balance	±0.5%	-
C	-	-	0.005
O	-	-	0.005
Co	-	-	0.005
Cu	-	-	0.005
Si	-	-	0.002
Mn	-	-	0.002
Mg	-	-	0.001
S	-	-	0.001
P	-	-	0.001
Other trace elements	-	-	0.0005 each

3. Physical Properties

Property	NiFe 80/20	NiFe 50/50	NiFe 36/64	Test Standard
Density (g/cm³)	8.74	8.25	8.05	ASTM B328
Melting Point (°C)	1425-1450	1420-1450	1410-1430	-
Electrical Resistivity (μΩ·cm)	20-25	45-50	75-85	ASTM B193
Thermal Conductivity (W/m·K)	25-30	15-20	10-15	ASTM E1225
Thermal Expansion Coefficient (10⁻⁶/K)	10-12	8-10	1.0-1.5	ASTM E228
Curie Temperature (°C)	400-450	500-550	230-250	-

4. Magnetic Properties

Property	NiFe 80/20	NiFe 50/50	NiFe 36/64
Saturation Magnetization (T)	0.75-0.85	1.50-1.60	1.40-1.50
Permeability (Initial)	20,000-50,000	2,000-5,000	500-1,000
Coercivity (A/m)	1.0-2.0	8.0-15.0	20.0-40.0
Residual Induction (T)	0.50-0.60	1.20-1.30	1.10-1.20

5. Mechanical Properties

Property	NiFe 80/20	NiFe 50/50	NiFe 36/64	Condition
Tensile Strength (MPa)	450-550	500-600	450-550	Annealed
Yield Strength (MPa)	150-200	200-250	250-300	Annealed
Elongation (%)	35-45	30-40	25-35	Annealed
Hardness (HV)	120-150	130-160	140-170	Annealed
Modulus of Elasticity (GPa)	155	165	145	-

6. Product Forms & Specifications

Product Form	Available Sizes	Tolerance	Surface Finish
Sheet/Plate	0.1-10mm thickness	±0.02mm	Cold-rolled, Annealed
Rod/Bar	5-100mm diameter	±0.05mm	Turned, Polished
Wire	0.1-5.0mm diameter	±0.005mm	Bright, Annealed
Custom Shapes	As required	Custom	Various finishes

7. Processing Characteristics

Thermal Treatment:

Annealing Temperature: 850-1100°C in hydrogen or vacuum
Quenching: Rapid cooling for optimal magnetic properties
Stress Relief: 400-500°C for machined parts

Machinability:

Good machining characteristics with proper tools
Recommended: Carbide tools with positive rake angles
Cooling: Adequate cooling during heavy machining

8. Applications

Primary Applications:

Magnetic Shields: Sensitive electronic components
Transformer Cores: High-frequency applications
Relays and Switches: Precision magnetic devices
Sensor Cores: Magnetic sensors and transducers
Vacuum Systems: Sealing applications
Precision Instruments: Dimensional stability components

Industry Sectors:

Aerospace and defense
Telecommunications
Medical equipment
Research laboratories
Precision engineering

9. Quality Assurance

Testing & Certification:

Chemical analysis certificate (GD-MS/ICP-OES)
Magnetic properties testing report
Mechanical properties verification
Dimensional inspection certificate
Surface quality inspection

Quality Standards:

ISO 9001 Quality Management System
RoHS Compliance Certificate
REACH Compliance Statement
Customized test reports available

Technical Support:

Application engineering support
Custom alloy development
Processing recommendations
Failure analysis services

All products are supplied with complete material certification and can be tailored to meet specific application requirements and performance criteria.

◉ Surfcae selection

SURFACE	CHARACTERISTIC	SUMMARY OF MANUFACTURING METHOD	APPLICATION
NO.1	Silvery white	Hot rolled to specified thickness	Do not need to have a glossy surface use
NO.1	lackluster	Hot rolled to specified thickness	Do not need to have a glossy surface use
NO.2D	Silvery white	After cold rolling, heat treatment and pickling are carried out	General material, deep material
NO.2B	Gloss is stronger than No.2D	After No.2D treatment, the final light cold rolling is carried out through the polishing roller	The general material
BA	As bright as a sixpence	No standard, but usually a bright annealed surface with high reflectivity.	Building materials, kitchen utensils
NO.3	Rough lapping	Grind with 100~200# (unit) strop tape	Building materials, kitchen utensils
NO.4	Intermediate grinding	Polished surface obtained by grinding with 150~180# strop abrasive tape	Building materials, kitchen utensils
NO.240	Fine lapping	Grinding with 240# strop abrasive tape	kitchenware
NO.320	Very fine grinding	Grinding was carried out with 320# strop abrasive tape	kitchenware
NO.400	The luster is close to BA	Use 400# polishing wheel to grind	General timber, building timber, kitchen appliances
HL	Hairline grinding	Suitable particle material for hair stripe grinding (150~240#) with many grains	Building, construction material
NO.7	It's close to mirror grinding	Use a 600# rotary polishing wheel to grind	For art or decoration
NO.8	Mirror ultrafinish	The mirror is ground with a polishing wheel	Reflector, for decoration