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Machinability DataProducts

INVAR 36

STOCK

Invar Bar | Invar Plate | Invar Wire

Invar Sheet | Invar Strip | Invar Rod

Also known as:

Nilo 36, K93600, WS 1.3912

ALLOY 36 TYPICAL
NOMINAL CHEMISTRY

ALLOY 36 TYPICAL
TENSILE STRENGTH

NICKEL (NI) 36.0 ANNEALED 85,000 MAX.
CHROMIUM (CR) 0.25 1/4 HARD 90,000 to 115,000
MANGANESE (MN) 0.50 1/2 HARD 105,000 to 125,000
SILICON (SI) 0.25 HARD 120,000 MIN.
CARBON (C) 0.05
ALUMINUM (AL) 0.10 TYPICAL HARDNESS, ROCKWELL B
MAGNESIUM (MG) 0.10 ANNEALED 70 MAX.
ZIRCONIUM (ZR) 0.10 1/4 HARD 78 to 83
TITANIUM (TI) 0.10 1/2 HARD 84 to 88
PHOSPHORUS (P) 0.020
SULFUR (S) 0.020
IRON BALANCE
 


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Invar 36 

TYPICAL LINEAR COEFFICIENT 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
 

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* 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 2000/2150F (1100/1180C) is preferred.
Invar 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: Invar 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 36 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: Invar 36 can be chromium, cadmium and nickel plated or zinc coated by the usual methods used for ferrous alloys.


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.
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Invar 36 Physical Constants:

Specific gravity 8.05
Density - lb/in3 0.291
Density - kg/m3 8055

Thermal conductivity

BTU-in/ft2-hr-F

W/m K 

72.6

10.5

Electrical resistivity

ohm-cir mil/ft

microhm-mm

495

820

Temperature coefficient of electrical resistivity

 per F (70/212F)
 per C (21.1/100C)

0.0006

0.0011

Mean coefficient of thermal expansion
10-6/F (0.0/350F)
k-1 (-18/175C)

0.90

1.6

Inflection point 375F (191C)
Curie temperature 535F (279C)
Melting point 2600F (1427C)
Specific heat
Btu/lb-F
kJ/kg K

0.123

0.515

   
Invar 36
MAGNETIC PROPERTIES:

permeability-temperature characteristics of Invar 36

 

USES:

  • 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
  • Laser part applications
  • Clock pendulums
  • Balance wheels
  • Watch parts
  • Tooling

 

 

FORMS AVAILABLE:

  • Hot rolled, forged bar and rod
  • Cold or hot rolled strip and plate
  • Cold rolled sheet
  • Wire
  • Welding wire TIG and MIG

 


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Hot Rolled Plate

 TM           WIDTH           LENGTH
.187    x       72      x       96      
.250    x       72      x       96      
.375    x       72      x       96      
.500    x       72      x       96      
.625    x       70      x       72      
.750    x       16      x       100     
1       x       16      x       56      
1.5     x       16      x       46      
2       x       20      x       60      
2.5     x       8.250   x       51      
4       x       7.125   x       18.5
4.625   x       5       x       51
5       x       12.7    x       15.5

Other thickness and widths available on request.


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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

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Invar Cold Rolled Sheet

 
TK     WIDTH
.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 thicknesses from .005 to .135 available on request

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Invar rod / Bar

 
DIA   LENGTH
.078  x   36
.093  x   36
.100  x   72
.125  x   120
.250  x   72
.500  x   144
.750  x   144
1.0    x   144
1.125 x  144
2.0
3.0
4.0

(Other sizes of rod on request)


Some sizes of plate are also available with a smooth ground surface,

 i.e., .187, .250, .375, .625.
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
  • Boeing-ASTM B-753 Hot rolled plate

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Disclaimer    

Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.

 
 

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