Vacodil36 Invar Low Expansion Alloy Tube

• Customization: Available
• Classification: Feni36
• Density: 8.1
• Model NO.: Vacodil36
• Resisivity: 0.78
• Curie Point: 230
• State: Soft
• Brand: Vacodil36
• Chemical Composition: Feni36
• Transport Package: Export Packing
• Specification: Can discuss
• Trademark: huona
• Origin: Shanghai
• HS Code: 7228600000
• Production Capacity: 200 Ton/Month

Product Description

Vacodil36 Invar Low Expansion Alloy tube

Classification : low coefficient of thermal expansion alloy

Application: 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 leveling rods used are 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.

Chemical Composition in %, Invar

Ni 35-37%	Fe .	C 0.05%	Si 0.3%	Mn 0,3-0,6 %	S o 0.015%
P 0.015%	Mo 0.1%	V 0.1%	Al 0.1%	Cu 0.1%	Cr 0,15 %

 
 Basic physical constants and mechanical properties of the alloy:

Density: γ = 8,1 g / cm3;
Electric resistivity: ρ = 0,78 ohm mm2 ? / m;
The temperature of the Curie point: Θs = 230 ° C;
Modulus of elasticity E = 144 kN / mm2;
Linear expansion coefficient a1 (20-100 ºC) ≤1,5 * 10-6 ºC -1
 
 

Temperature Range/ºC	1/10-6ºC-1	Temperature Range/ºC	1/10-6ºC-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

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

 All offered "huona(Shanghai) New Co., Ltd" of rolled metal products Invar differs guaranteed high quality. Customers can buy Invar alloy for the production of different types of products and rely on the high-speed supply of rolled metal.