Home > Low Expansion Alloy >

4J50 Wire FeNi50 Alloy Wire ASTM F15 Soft Magnetic Sealing Wire for Glass to Metal Seals and Electronic Components

Product Categories

Low Expansion Alloy [37]
Soft Magnetic Alloy [18]
Elastic Alloy [10]
Thermal Bimetal [9]
Welding Wire [27]
Thermal Spray Wire [26]
Nichrome Alloy [45]
Pure Nickel [24]
Copper Nickel Alloy [23]
Thermocouple Cable [41]
Monel Alloy [9]
Inconel Alloy [25]
Hastelloy Alloy [5]
High Temperature Alloy [24]
Nitinol Alloy [9]
To Header [20]

Huona (Shanghai) New Material Co., Ltd.

Trust Seal

Verified Supplier

Credit Check

Supplier Assessment

Contact Now

4J50 Wire FeNi50 Alloy Wire ASTM F15 Soft Magnetic Sealing Wire for Glass to Metal Seals and Electronic Components

Name: 4J50 Wire FeNi50 Alloy Wire ASTM F15 Soft Magnetic Sealing Wire for Glass to Metal Seals and Electronic Components
Brand: HUONA
Price: 1 USD

Brand Name : HUONA

Model Number : WIRE

Certification : ISO 9001, ROHS, EN 10204 3.1

Place of Origin : CHINA

MOQ : 1KG

Price : Bargain

Payment Terms : T/T

Supply Ability : 1500tons/Year

Delivery Time : A WEEK

Packaging Details : DIN Spool, Carton, Wooden Case

Model NO. : alloy 52

Transport Package : DIN Spool, Carton, Wooden Case

HS Code : 7505220000

Specification : Customized

Origin : Jiangsu, China

Production Capacity : 1500tons/Year

Country of Origin : China (OEM and logo customization available)

Contact Now

Product Description

4J50 wire is a precision iron-nickel soft magnetic alloy containing approximately 50% nickel and is equivalent to ASTM F15 standard. It is designed for applications requiring a close thermal expansion match with borosilicate glass and ceramic materials, making it ideal for glass-to-metal sealing.

This alloy wire offers excellent soft magnetic properties, good mechanical stability, and consistent thermal performance. It is widely used in electronic tubes, relays, vacuum devices, sensors, and microelectronic packaging. 4J50 wire is often referred to as a Kovar-type sealing material and is compatible with a wide range of high-reliability electronic and aerospace applications.

4J50 Wire FeNi50 Alloy Wire ASTM F15 Soft Magnetic Sealing Wire for Glass to Metal Seals and Electronic Components

Key Features

Matched thermal expansion to borosilicate hard glass
Stable magnetic and mechanical performance
Excellent glass-sealing and vacuum compatibility
Smooth surface and high dimensional precision
Good formability, weldability, and corrosion resistance
Low outgassing for vacuum or hermetically sealed applications

Typical Applications

Glass-to-metal sealed headers and pins
Vacuum tubes, electronic relays, and sensors
IC package leads and transistor enclosures
Aerospace instrumentation and feedthroughs
Medical electronics and hermetically sealed devices
Thermal expansion matched sealing for glass/ceramic components

Chemical Composition (%)

Element	Typical Content (%)
Nickel (Ni)	49.0 – 51.0
Cobalt (Co)	≤ 0.50
Manganese (Mn)	0.30 – 0.60
Silicon (Si)	≤ 0.30
Carbon (C)	≤ 0.05
Sulfur (S)	≤ 0.02
Phosphorus (P)	≤ 0.02
Iron (Fe)	Balance

Mechanical Properties (Annealed Condition)

Property	Typical Value
Tensile Strength	≥ 450 MPa
Yield Strength (0.2%)	≥ 250 MPa
Elongation	≥ 30%
Hardness	≤ 160 HV
Density	~8.2 g/cm³
Thermal Expansion (20–300°C)	~5.0 × 10⁻⁶ /°C
Max Service Temp	~500°C (932°F)

Available Specifications

Item	Details
Wire Diameter Range	0.02 mm – 3.0 mm
Form	Spools, coils, cut lengths
Surface Finish	Bright, oxide-free, annealed
Standards	ASTM F15, GB/T 14986, YB/T 5231
Condition	Annealed (soft), hard drawn
Packaging	Plastic spool 1 kg – 15 kg, vacuum packed available
Certification	ISO 9001, ROHS, EN 10204 3.1
Country of Origin	China (OEM and logo customization available)

Packaging & Shipping

Vacuum packaging or plastic spools
Anti-corrosion treatment
Air/sea/express delivery available
Delivery time: 7–15 business days

Product Tags: