China Bright 0.5mm Invar 36 Wire for Sealing Precision Instrument Manufacture and Factory

Bright 0.5mm Invar 36 Wire for Sealing Precision Instrument

Short Description:

DIN 17745 4j36 Invar Alloy Wire Low Expansion Alloy Feni36 Wire

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

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).

Model NO.: Invar

OEM: Yes

State: Soft 1/2hard hard T-hard

HS Code: 74099000

Origin: China

Density: 8.1

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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(OMmm2/m)	0.78
Temperature factor of resistivity(20ºC~200ºC)X10-6/ºC	3.7~3.9
*Thermal conductivity, λ/ W/(mºC)**	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