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Invar 36 strip 4J36 with low expansion coefficient for Stamping parts with constant dimensions

Invar 36 strip 4J36 with low expansion coefficient for Stamping parts with constant dimensions

Short Description:

4J36  (Expansion alloy) (Common Name: Invar, FeNi36, Invar Standard, Vacodil36)


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4J36 (Invar), also known generically as FeNi36 (64FeNi in the US), is a nickel–iron alloy notable for its uniquely low coefficient of thermal expansion (CTE or α).

4J36 (Invar) is used where high dimensional stability is required, such as precision instruments, clocks, seismic creep gauges, television shadow-mask frames, valves in motors, and antimagnetic watches. In land surveying, when first-order (high-precision) elevation leveling is to be performed, the Level staff (leveling rod) used is made of Invar, instead of wood, fiberglass, or other metals. Invar struts were used in some pistons to limit their thermal expansion inside their cylinders.

4J36 use oxyacetylene welding, electric arc welding, welding and other welding methods. Since the coefficient of expansion and chemical composition of the alloy is related should be avoided due to welding causes a change in the alloy composition, it is preferable to use Argon arc welding welding filler metals preferably contains 0.5% to 1.5% titanium, in order to reduce weld porosity and crack.

Normal composition%

Ni 35~37.0 Fe Bal. Co - Si ≤0.3
Mo - Cu - Cr - Mn 0.2~0.6
C ≤0.05 P ≤0.02 S ≤0.02

Typical Physical properties

Density (g/cm3) 8.1
Electrical resistivity at 20℃(Ωmm2/m) 0.78
Temperature factor of resistivity(20℃~200℃)X10-6/℃ 3.7~3.9
Thermal conductivity, λ/ W/(m*℃) 11
Curie point   Tc/ ℃ 230
Elastic Modulus,  E/ Gpa 144

Coefficient of expansion

θ/℃ α1/10-6-1 θ/℃ α1/10-6-1
20~-60 1.8 20~250 3.6
20~-40 1.8 20~300 5.2
20~-20 1.6 20~350 6.5
20~-0 1.6 20~400 7.8
20~50 1.1 20~450 8.9
20~100 1.4 20~500 9.7
20~150 1.9 20~550 10.4
20~200 2.5 20~600 11.0

Typical Mechanical properties

Tensile Strength Elongation
Mpa %
641 14
689 9
731 8

Temperature factor of resistivity

Temperature range, ℃ 20~50 20~100 20~200 20~300 20~400
aR/ 103 *℃ 1.8 1.7 1.4 1.2 1.0
The heat treatment process
Annealing for stress relief Heated to 530~550℃ and hold 1~2 h. Cold down
annealing In order to eliminate hardening, which be bring out in cold-rolled, cold drawing process. Annealing needs heated to 830~880℃ in vacuum,hold 30 min.
The stabilization process 1) In protective media and heated to 830 ℃, hold 20min. ~ 1h, quench
2) Due to the stress generated by quenching, heated to 315℃,hold 1~4h.
Precautions 1) Can not be hardened by heat treatment
2) Surface treatment can be sandblasting, polishing or pickling.
3) Alloy can be used 25% hydrochloric acid pickling solution at 70 ℃ to clear oxidized surface

Style of supply

Alloys Name Type Dimension
4J36 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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