4j36 Kovar Alloy Wire Invar Feni 36 Alloy Wire

• Customization: Available
• Classification: Low Expansion Alloy
• Density: 8.1
• Model NO.: 4J36
• Resisivity: 0.78
• Curie Point: 230
• State: Soft
• Brand: 4j36
• Chemical Composition: Feni36
• OEM: Yes
• Sample: Free
• Material: Fe- Ni Alloy
• Surface: Smooth and Bright
• Condition: Soft
• Diameter: 0.05~10mm
• Transport Package: Export Packing
• Specification: Can discuss
• Trademark: HUONA
• Origin: Shanghai
• HS Code: 722990900
• Production Capacity: 50 Ton/Month

Product Description

4J36 Kovar Alloy Wire Invar FeNi 36 Alloy Wire
(Common Name: Invar, FeNi36, Invar Standard, Vacodil36)

INVAR 36 is a nickel-iron, low expansion alloy containing 36% nickel. It maintains nearly constant dimensions over the range of normal atmospheric temperatures, and has a low coefficient of expansion from cryogenic temperatures to about 500° F. The alloy also retains good strength and toughness at cryogenic temperatures. 

INVAR 36 can be hot and cold formed and machined using processes similar to austenitic stainless steels. INVAR 36 is weldable using Filler Metal CF36 which is available in bare wire for both the GTAW and GMAW process. 

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

Coefficient of expansion

θ/ºC	α1/10^-6ºC^-1	θ/ºC	α1/10^-6ºC^-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 Physical properties

Density (g/cm3)	8.1
Electrical resistivity at 20ºC(Ohm mm^2/m)	0.78
Temperature factor of resistivity(20ºC~200ºC)X10^-6/ºC	3.7~3.9
Thermal conductivity, λ/ W/(m*ºC)	11
Curie point Tc/ ºC	230
Elastic Modulus, E/ Gpa	144

 

The heat treatment process
Annealing for stress relief	Heated to 530~550ºC 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 830~880ºC in vacuum,hold 30 min.
The stabilization process	In protective media and heated to 830 ºC, hold 20min. ~ 1h, quench Due to the stress generated by quenching, heated to 315ºC,hold 1~4h.
Precautions	Can not be hardened by heat treatment Surface treatment can be sandblasting, polishing or pickling. Alloy can be used 25% hydrochloric acid pickling solution at 70 ºC to clear oxidized surface

Typical Mechanical properties

Tensile Strength	Elongation
Mpa	%
641	14
689	9
731	8

Temperature factor of resistivity

Temperature range, ºC	20~50	20~100	20~200	20~300	20~400
aR/ 10^3 *ºC	1.8	1.7	1.4	1.2	1.0

Applied field:

Invar 36 suit for need to apply ultra-low coefficient of heat expansion environment.Typical applications are as follows:

1.Liquefied gas production, storage and transport 
2.The measurement and control instruments work temperature lower than 200ºC, such as temperature regulating device 
3.Metals and other materials use the screw connector bush 
4.Bimetal and bimetallic temperature controller
5.Film framework
6.Shadow mask 
7.CRP components of the aviation industry temper Die 
8.lower than -200ºC the satellite and missile electronic control unit framework 
9.The auxiliary tube of the electromagnetic lens in the laser control device

Advantage:

1. Experienced manufacturer
2. Stable products and service quality
3. Timely delivery
4. Good technology support
5. Win-win cooperation opportunity