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in PDF FormatLOW EXPANSION ALLOYS
INVAR 36
Also known as: 36 Alloy, Nilo 36, K93600, WS 1.3912
INVAR 36 TYPICAL NOMINAL CHEMISTRY
NICKEL (NI) |
36.0 |
CHROMIUM (CR) |
0.25 |
MANGANESE (MN) |
0.50 |
SILICON (SI) |
0.25 |
CARBON (C) |
0.05 |
ALUMINUM (AL) |
0.10 |
MAGNESIUM (MG) |
0.10 |
ZIRCONIUM (ZR) |
0.10 |
TITANIUM (TI) |
0.10 |
PHOSPHORUS (P) |
0.020 |
SULFUR (S) |
0.020 |
IRON (FE) |
BALANCE |
INVAR 36 TYPICAL TENSILE STRENGTH
ANNEALED |
85,000 MAX. |
¼ HARD |
90,000 to 115,000 |
½ HARD |
105,000 to 125,000 |
HARD |
120,000 MIN. |
TYPICAL HARDNESS, ROCKWELL B
ANNEALED |
70 MAX. |
¼ HARD |
78 to 83 |
½ HARD |
84 to 88 |
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 |
INVAR 36 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: 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 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.