Home > Low Expansion Alloy >

4J42 Rod Controlled Expansion Alloy Bar Fe Ni Precision Alloy Material

Product Categories

Low Expansion Alloy [49]
Soft Magnetic Alloy [18]
Elastic Alloy [10]
Thermal Bimetal [9]
Welding Wire [27]
Thermal Spray Wire [26]
Nichrome Alloy [53]
Pure Nickel [24]
Copper Nickel Alloy [22]
Thermocouple Cable [41]
Monel Alloy [9]
Inconel Alloy [25]
Hastelloy Alloy [5]
High Temperature Alloy [24]
Nitinol Alloy [9]
To Header [20]
Others [2]

Huona (Shanghai) New Material Co., Ltd.

Trust Seal

Verified Supplier

Credit Check

Supplier Assessment

Contact Now

4J42 Rod Controlled Expansion Alloy Bar Fe Ni Precision Alloy Material

Name: 4J42 Rod Controlled Expansion Alloy Bar Fe Ni Precision Alloy Material
Brand: HUONA
Price: 1 USD

Brand Name : HUONA

Model Number : 4J42

Certification : ISO 9001, SGS, RoHS

Place of Origin : China (OEM/ODM service available)

MOQ : 5KG

Price : NEGOTIATION

Payment Terms : T/T

Supply Ability : 1000KG/WEEK

Delivery Time : A WEEK

Packaging Details : Wooden case, steel strip bundling

Density : 8.1 g/cm³

Thermal Expansion (20–300°C) : 5.3 ×10⁻⁶/°C

Tensile Strength : 450 MPa

Hardness : HB 130–160

Working Temp : 60°C to 400°C

Standard : GB/T, ASTM, IEC

Diameter : 3 mm – 200 mm

Surface : Bright / Polished / Black

Contact Now

Product Description

4J42 alloy rod is a Fe-Ni controlled expansion alloy containing about 42% nickel. It features a linear thermal expansion coefficient closely matching that of hard glass and ceramics, making it ideal for glass-to-metal and ceramic-to-metal sealing applications.

This alloy offers stable expansion performance, good processing properties, and excellent sealing reliability, widely used in electronic packaging, vacuum devices, and aerospace components.

Key Features

Fe-Ni controlled expansion alloy
Stable thermal expansion coefficient
Excellent sealing performance with glass/ceramic
Good machinability and weldability
Supplied in rods, wires, strips, and customized forms

Typical Applications

Glass-to-metal and ceramic-to-metal seals
Electronic packaging housings
Vacuum tubes, relays, and electronic devices
Semiconductor device supports
Aerospace and precision instruments

Chemical Composition (%)

Element	Content
Fe	Balance
Ni	~42%
Mn, Si, C, etc.	Minor

Physical and Performance Properties

Property	Typical Value
Density	~8.1 g/cm³
Thermal Expansion (20–300°C)	~5.3 ×10⁻⁶/°C
Tensile Strength	≥ 450 MPa
Hardness	~HB 130–160
Working Temp	-60°C to 400°C
Standard	GB/T, ASTM, IEC

Available Specifications

Item	Range
Diameter	3 mm – 200 mm
Length	≤ 6000 mm
Tolerance	As per ASTM / GB standard
Surface	Bright / Polished / Black
Packaging	Wooden case, steel strip bundling
Certification	ISO 9001, SGS, RoHS
Origin	China (OEM/ODM service available)

Product Tags: