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Automotive Thermostat Elements Precision Alloys With Spool / Coil Package

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China Ohmalloy Material Co.,Ltd certification
China Ohmalloy Material Co.,Ltd certification
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—— Mike Harness

OHMALLOY can provie me only 1kg Kovar alloy wire 1.0mm with short time, that is really amazing. Thanks

—— Janey

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—— Chris

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—— Aaron

Automotive Thermostat Elements Precision Alloys With Spool / Coil Package

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Large Image :  Automotive Thermostat Elements Precision Alloys With Spool / Coil Package Get Best Price

Product Details:
Place of Origin: China(Shanghai)
Brand Name: OHMALLOY
Certification: SGS, ISO
Model Number: 4J36
Payment & Shipping Terms:
Minimum Order Quantity: 50 KG
Price: negotiable
Packaging Details: Spool + Waterproof paper + Wooden case
Delivery Time: 20-25 working days
Payment Terms: L/C, D/A, D/P, T/T,
Supply Ability: 10000 KG per month
Detailed Product Description
Material: Fe Ni Alloy Condition: Soft
Wire Diameter Range: 0.1mm ~ 9.0mm Package: Spool, Coil, Wooden Case
Surface: Bright Density: 8.1 G/cm3
Application: Automotive Thermostat Elements Annealing Treatment: In Vacuum Furnace
Elongation: More Than 25%
High Light:

nickel iron alloy


fe ni alloy

Automotive Thermostat Elements Precision Alloys With Spool / Coil Package




Invar 36 / FeNi 36 / Ohmalloy 4J36 strip for Automotive thermostat elements



OhmAlloy-4J36 (Expansion alloy)

(Common Name: Invar, FeNi36, Invar Standard, Vacodil36)

OhmAlloy-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).


The name Invar comes from the word invariable, referring to its relative lack of expansion or contraction with temperature changes.


It was invented in 1896 by Swiss physicist Charles Édouard Guillaume. He received the Nobel Prize in Physics in 1920 for this discovery, which enabled improvements in scientific instruments.


OhmAlloy-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.



OhmAlloy-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







Automotive Thermostat Elements Precision Alloys With Spool / Coil Package 0


Automotive Thermostat Elements Precision Alloys With Spool / Coil Package 1


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.
  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  
OhmAlloy-4J33 Wire D= 0.1~8 mm  
OhmAlloy-4J33 Strip W= 5~250 mm T= 0.1 mm
OhmAlloy-4J33 Foil W= 10~100 mm T= 0.01~0.1 mm
OhmAlloy-4J33 Bar Dia= 8~100 mm L= 50~1000 mm






1. What's the minimum quantity customer can order?
If we have your size in stock, we can provide any quantity you want.
If we do not have, for spool wire, we can produce 1 spool, about 2-3kg. For coil wire, 25kg.

2. How can you pay for small sample amount?
We have account, wire transfer for sample amount also ok.

3. Customer do not have express account. How will us arrange the delivery for sample order?
Just need to provide your address information, we will check the express cost, you can arrange the express cost together with sample value.

4. What's our payment terms?
We can accept LC T/T payment terms, it also depending on delivery and total amount. Let's talk more in details after getting your detailed requirements.

5. Do you provide free samples?
If you want several meters and we have stock of your size, we can provide, customer need to bear the International express cost.

6. What's our working time?
We will give you reply through email/phone Online contact tool within 24 hours. No matter working day or holidays.

Contact Details
Ohmalloy Material Co.,Ltd

Contact Person: Alex

Tel: +8613795230939

Send your inquiry directly to us