4j36 Invar Stamping Alloy Kovar Fe-Ni36 Soft Strip

• Classification: Feni36
• Density: 8.1g/cm3
• Resisivity: 0.78
• Curie Point: 230
• State: Soft
• Brand: 4j36
• Model NO.: 4j36
• Chemical Composition: Feni36
• Sample: Free
• Surface: Smooth and Bright
• Condition: Soft
• Stock: Seyn
• OEM: Yes
• Transport Package: Export Packing
• Specification: Can discuss
• Trademark: HUONA
• Origin: Shanghai
• HS Code: 7505120000
• Production Capacity: 200 Ton/Month

Product Description

4j36 INVAR alloy wire Low Expansion Alloy FeNi36 wire

Classification : low coefficient of thermal expansion alloy

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, to the as precision instruments, clocks, and seismic is creep gauges, television shadow mask - frames, and valves in motors,And antimagnetic watches. In land Surveying, when first order (precision) was to be performed, the Level staff (rod) used is made of Invar, instead of wood, fiberglass,Or other metals. Invar struts were 2 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

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(OMmm^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 Hear 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