Invar 36 Alloy Low Expansion Stencil & Etching Alloys: Nickel Iron Alloys Coil, Sheet, Hot Rolled Plate, Round Rod Machinability & Material

INVAR

Invar 36 Alloy Low Expansion Stencil & Etching Alloys

Alloy 36 (Invar 36), is a low expansion alloy that gets its name from “invariable” because it will not react to thermal expansion. Alloy 36 (Invar 36) is most commonly used in applications that require minimum thermal expansion and high dimensional stability, including precision instruments like stencils, fine line etching and laser cutting, optical devices and electronics. Alloy 36 (Invar 36) is also used in scientific instruments, physics laboratory devices and motor valves.

These characteristics make Alloy 36 (Invar 36) material particularly important to the aircraft & aerospace industry, military and defense, telecommunications industry, machine shops and alloys used to make tools for the solar industry to make solar panels. Leveling rods made of Alloy 36 (Invar 36) are also used in land surveying for high precision elevation leveling. Alloy 36 (Invar 36), a nickel steel alloy, is available in rods, sheets, coils and plates.

National Electronic Alloys is a trusted Alloy 36 (Invar 36) supplier with the experience to recognize your needs and address your concerns, and we have Alloy 36 (Invar 36) material in stock to fill your order quickly. Quite frankly, there’s too much inferior material on the market today, and choosing the wrong Alloy 36 (Invar 36) supplier can damage your company’s reputation and cost you money.

We are an ISO Certified Corporation. All Alloy 36 (Invar 36) products are DFARS Compliant and also in conformance with Section 1502 of the Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010.

Why take a chance on second rate material from another Alloy 36 (Invar 36) supplier when you can get the highest rated material in the industry from National Electronic Alloys?


TYPICAL NOMINAL CHEMISTRY
NICKEL (NI) 36.0
CHROMIUM(CR) 0.25
MANGANESE(MN) 0.50
SILICON (SI) 0.25
CARBON (C) 0.05
PHOSPHORUS (P) 0.020
SULFUR (S) 0.020
Cobalt (Co) 0.50
IRON BALANCE


TYPICAL TENSILE STRENTGH
ANNEALED 85,000 MAX
1/4 HARD 90,000 TO 115,000
1/2 HARD 105,000 TO 125,000
HARD 120,000 MIN.


TYPICAL HARDNESS, ROCKWELL B
ANNEALED 70 MAX
1/4 HARD 78 TO 83
1/2 HARD 84 TO 88

Please note that these properties do not necessarily reflect the hardness properties of "STENCIL GRADE INVAR", due to the nature of the application. Please contact our office for further information.


TYPICAL LINEAR COEFICIENT OF THERMAL EXPANSION
(cm per cm. C x 10-6)
30 to 100 1.18
30 to 200 1.72
30 to 300 4.92
30 to 350 6.60
30 to 400 7.82
30 to 425 N/A
30 to 450 8.82
30 to 500 9.72
30 to 550 N/A
30 to 600 11.35
30 to 700 12.70
30 to 800 13.45
30 to 900 13.85
30 to 1000 N/A

* PLEASE NOTE THIS IS A NOMINAL DATA SHEET

WORKABILITY

FORGING: The principal precaution to observe in forging is to heat quickly and avoid soaking in the furnace. Long soaking may result in a checked surface due to absorption of sulfur from the furnace atmosphere and/or oxide penetration. A forging temperature of 2000/2150øF (1100/1180øC) is preferred.
Invar alloy 36 may also be swaged and cold upset.

GRINDING: A silicon carbide wheel is desirable, preferably a soft wheel which will wear without loading. For finish grinding, a satisfactory grade to start with is No. 80 grit.

WELDING: Alloy 36 can be welded by the conventional methods. Caution must be taken so as not to overheat the molten metal. This will avoid spattering of the molten metal and pits in the welded area. When filler rod is required, Invar rod has been used.

BRAZING: Silver and zinc-free alloys have been used for brazing Invar 36. This alloy should be annealed prior to brazing. Joints should be designed to avoid placing material in tension during brazing.

PLATING: Alloy 36 can be chromium, cadmium and nickel plated or zinc coated by the usual methods used for ferrous alloys.




Machinability Data
Before machining, the welded structures must be fully annealed.
The machinability of Invar is similar to,austenitic stainless steel such as AISI 304.
The following milling parameters can be used (only for Invar tooling fabrication and particularly for large tools.)

Tool Configuration
Tool Type
Use
Surface Speed
Feed Rate
End Mill
Carbide
Rough/Finish
320 in./min.
1.0 in./min.
End Mill
Corn Cob)
HSS
Rough Milling
375 in./min
2.0 in./min.
End Mill
HSS
Finish Milling
Up to 600 in./min.
4.0 in./min.


PHYSICAL CONSTANTS:
Specific gravity 8.05
Density - lb/in3 0.291
kg/m3 8055
Thermal conductivity
BTU-in/ft2-hr-°F 72.6
W/m · K 10.5
Electrical resistivity
ohm-cir mil/ft 495
microhm-mm 820
Temperature coefficient of electrical resistivity
per °F (70/212°F) 0.0006
per °C (21.1/100°C) 0.0011
Mean coefficient of thermal expansion
10-6/°F (0.0/350°F) 0.90
k-1 (-18/175°C) 1.6
Inflection point 375°F (191°C)
Curie temperature 535°F (279°C)
Melting point 2600°F (1427°C)
Specific heat
Btu/lb-°F 0.123
kJ/kg K 0.515


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USES: FORMS AVAILABLE:
  • Molds for composite aircraft parts
  • Molds for composite boat parts
  • Precision condenser plates
  • Resonant cavities for radars
  • Precision measurements constructions
  • Special joints and washers
  • Thermostatic bimetals
  • Lazer part applications
  • Clock pendlems
  • Balance wheels
  • Watch parts
  • Tooling
  • Hot rolled, forged bar and rod
  • Cold or hot rolled strip and plate
  • Cold rolled sheet
  • Wire
  • Welding wire TIG and MIG



Hot Rolled Plate
TK
.187
.250
.375
.500
.625
.750
1
1.25
1.5
2
2.5
3
4
4.625
5
6
Other thicknesses and widths available on request.
We carry large plates in Invar 36 but new stock can vary in Width and Length. Please check with us to find the sizes we have in current stock.

 

Invar Welding Wire
.045 x MIG spools 25# prox spools
.093 x 36 TIG pkg'd in 10# prox tubes
.078 x 36 TIG
.093 x 36 TIG

 

Cold Rolled Sheet
TK
WIDTH
.010 x 10.5 x 72
.020 x 10.5 x 72
.015 x 10.5 x 72
.030 x 24 x 72
.041 x 24 x 72
.060 x 24 x 60
.060 x 24 x 120
.100 x 24 x 72
.125 x 24 x 60
.125 x 24 x 120

 

Coil Cold Rolled
Coil thicknesses from .005 to .135 available on request

 

Invar Rod
DIA LENGTH
DIA LENGTH
.078 x 36 .093 x 36
.100 x 72 .125 x 120
.187 x 120/144 .250 x 72
.312 x 120/144 .500 x 144
.625 x 120/144 .750 x 144
.875 x 120/144 1.0 x 144
1.125 x 144 1.250 x 120/144
1.650 x 120/144 1.750 x 120/144
2.0 x 120/144 2.375 x 120/144
2.5 x 120/144 2.75 x 120/144
3.0 x 120/144 3.5 x 120/144
4.0 x 120/144 5.0 x 120/144
6.0 x 120/144 (Other sizes of rod on request)

 


Note:  Please note that these properties do not necessarily reflect the properties of "STENCIL GRADE INVAR", due to the nature of the application. Please contact our office for further information.
Some sizes of plate are also available with a smooth ground surface, i.e., .187, .250, .375, .625.
M.O.S.A.= Many other sizes available

  • MIL I 230IIC Class 7 ground plate and cold rolled sheet
  • MIL S 16598 Available in rod diameters .500 and up
  • ASTM B-753 Hot rolled plate
  • ASTM F 1684
  • Boeing Specification D-33078

More Info on Invar



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