China FeNi Nickel Iron Alloy Precision 0.5mm Invar 36 Wire For Sealing Precision Instrument Manufacture and Factory

FeNi Nickel Iron Alloy Precision 0.5mm Invar 36 Wire For Sealing Precision Instrument

Short Description:

Model NO.: invar 36 wire

Material: Fe- Ni Alloy

Surface: Smooth and Bright

Condition: Soft, 1/2h. Hard

Diameter: 0.02- 5.0mm

HS Code: 75125000

Density (g/cm3): 8.1

Send email to us

Product Detail

FAQ

Product Tags

FeNi Nickel Iron alloy precision 0.5mm Invar 36 Wire for Sealing Precision Instrument

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.

Chemical composition

composition	%	Fe	Ni	Mn	C	P	S	SI
content	min	Bal	35.0	0.2
content	max	Bal	37.0	0.6	0.05	0.02	0.02	0.3

physical properties

Density (g/cm3) 8.1

Electrical resistivity at 20ºC(mm2/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

Melting point ºC 1430

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 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/ 103 *ºC	1.8	1.7	1.4	1.2	1.0

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