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FeNi42/ 4J42/ 42Н

FeNi42/ 4J42/ 42Н

Short Description:

4J42 alloy is mainly composed of iron, nickel elements. It is characterized with a fixed coefficient of expansion. Increase the thermal expansion coefficient and the Curie point with increase of nickel content.


Product Detail

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4J42 Expansion alloy
(Common Name: 42H Glass Sealing 42, Nilo42, N42, FeNi42)

4J42 alloy is mainly composed of iron, nickel elements. It is characterized with a fixed coefficient of expansion. Increase the thermal expansion coefficient and the Curie point with increase of nickel content.

4J42 alloy is widely used the structure of the sealing material in the electric vacuum industry.
Normal composition%

Ni 41.5~42.5 Fe Bal. Co - Si ≤0.3
Mo - Cu - Cr - Mn ≤0.8
C ≤0.05 P ≤0.02 S ≤0.02 Al ≤0.1

Typical Physical properties

Density (g/cm3) 8.12
Electrical resistivity at 20℃(Ωmm2/m) 0.61
Thermal conductivity, λ/ W/(m*℃) 14.6
Curie point   Tc/ ℃ 360
Elastic Modulus,  E/ Gpa 147

Coefficient of expansion

θ/℃ α1/10-6-1 θ/℃ α1/10-6-1
20~100 5.6 20~400 5.9
20~200 4.9 20~450 6.9
20~300 4.8 20~500 7.8
20~350 4.95 20~600 9.2

Typical Mechanical properties

Tensile Strength Elongation
Mpa %
490 35
The heat treatment process
Annealing Heated to 900 ±20℃ in a hydrogen atmosphere
Holding time, h 1 hour
cooling With speed not more than 5 ℃ / min. cooling to below 200 ℃

Style of supply

Alloys Name Type Dimension
4J42 Wire D= 0.1~8mm
Strip W= 5~250mm T= 0.1mm
Foil W= 10~100mm T= 0.01~0.1
Bar Dia= 8~100mm L= 50~1000

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  • #1 SIZE RANGE
    Large size range from 0.025mm (.001”) to 21mm (0.827”)

    #2 QUANTITY
    Order Quantity ranging from 1 kg to 10 tonnes
    At Cheng Yuan Alloy, we take great pride in customer satisfaction and frequently discuss individual requirements, offering a tailored solution through manufacturing flexibility and technical knowledge.

    #3 DELIVERY
    Delivery within 3 weeks
    We typically manufacture your order and ship within 3 weeks, delivering our products to more than 55 countries across the world.

    Our lead times are short because we stock in excess of 200 tonnes of more than 60 ‘High Performance’ alloys and, if your finished product is not available from stock, we can manufacture within 3 weeks to your specification.

    We take pride in our more than 95% on time delivery performance, as we are always striving for excellent customer satisfaction.

    All wire, bars, strip, sheet or wire mesh are securely packed suitable for transporting by road, air courier or sea, with available in coils, spools and cut lengths. All items are clearly labelled with the order number, alloy, dimensions, weight, cast number and date.
    There is also the option to supply neutral packaging or labelling featuring the customer’s branding and company logo.

    #4 BESPOKE MANUFACTURING
    Order is manufactured to your specification
    We produce wire, bar, flat wire, strip, sheet to your exact specification and in exactly the quantity you are looking for.
    With a range of 50 Exotic Alloys available, we can provide the ideal alloy wire with specialist properties best suited to your chosen application.
    Our alloy products, such as the corrosion resistant Inconel® 625 Alloy, is designed for aqueous and off-shore environments, while the Inconel® 718 alloy offers superior mechanical properties in low and sub-zero temperature environments. We also have high strength, hot cutting wire ideal for high temperatures and perfect for cutting polystyrene (EPS) and heat sealing (PP) food bags.
    Our knowledge of the industry sectors and state-of-the-art machinery means we can reliably manufacture alloys to strict design specifications and requirements from all over the world.

    #5 EMERGENCY MANUFACTURING SERVICE
    Our ‘Emergency Manufacturing Service’ for delivery within days
    Our usual delivery times are 3 weeks, however if an urgent order is required, our Emergency Manufacturing Service ensures your order is manufactured within days and shipped to your door via the fastest route possible.

    If you have an emergency situation and require products even faster, contact us with your order specification. Our technical and production teams will swiftly respond to your quote.

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    Main Products

    The product forms include wire, flat wire, strip, plate, bar, foil, seamless tube , Wire mesh, powder, etc., can meet the application needs of different customers.

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