|
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 |
| 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 |
| 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
|
|
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. |
|
.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
|
|
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
|
|
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) |
|
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
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[TOP]
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