Jul 24 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
Machinability
Forming
Welding
Heat Treatment
Forging
Cold Working
Other Designations
Applications
Introduction
Ulbraseal 52 is one of the glass to metal sealing alloys with a constant coefficient of thermal expansion of up to 565°C (1050°F). This alloy is generally used in the annealed condition as residual cold working tends to distort the coefficient of thermal expansion.
The following datasheet will provide an overview of Ulbraseal 52 alloy.
Chemical Composition
The chemical composition of Ulbraseal 52 alloy is outlined in the following table.
|
Element |
Content (%) |
|
Nickel, Ni |
50.5 |
|
Manganese, Mn |
0.6 |
|
Silicon, Si |
0.3 |
|
Chromium, Cr |
0.25 |
|
Aluminum, Al |
0.1 |
|
Carbon, C |
0.05 |
|
Iron, Fe |
Balance |
Physical Properties
The following table shows the physical properties of Ulbraseal 52 alloy.
|
Properties |
Metric |
Imperial |
|
Density |
8.3 g/cm3 |
0.3 lb/in3 |
|
Melting point |
1450°C |
2640°F |
Mechanical Properties
The mechanical properties of Ulbraseal 52 alloy are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
450-550 MPa |
65300-79800 psi |
Thermal Properties
The thermal properties of Ulbraseal 52 alloy are given in the following table.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@20-100°C/68-212°F) |
10.3 µm/m°C |
5.72 µin/in°F |
|
Thermal conductivity |
17 W/mK |
118 BTU.in/hrft².°F |
Fabrication and Heat Treatment
Machinability
Conventional machining techniques that are used for machining austenitic steels can be used. However, the alloy has to be kept away from sulfur containing oils as they may contaminate the alloy.
Forming
Ulbraseal 52 alloy is characterized by good ductility, and hence it can be formed by conventional means.
Welding
The alloy can be welded using conventional methods.
Heat Treatment
The alloy can be annealed at 816°C (1500°F) and then air cooled.
Forging
Forging can be performed at a temperature of 1177°C (2150°F).
Cold Working
Ulbraseal 52 alloy can be readily cold worked.
Other Designations
Other designations that are equivalent to Ulbraseal 52 alloy include the following:
-
MIL I-23011 Class 2
-
ASTM F30-68
Applications
The following are the list of applications of Ulbraseal 52 alloy:
-
Cores in mechanical rectifiers
-
Magnetic amplifiers requiring rectangular hysteresis
-
Glass to metal sealing applications.