Jul 30 2013
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
Machinability
Forming
Welding
Forging
Cold Working
Annealing
Hardening
Other Designations
Applications
Introduction
Ulbraseal 42 alloy is an iron-nickel alloy with controlled thermal expansion properties. The alloy has a low expansion coefficient that matches the expansion characteristics of hard borosilicate glasses and 98% alumina. Under annealed or tempered conditions, the alloy is solderable, and has good photoetching characteristics, good stampability and excellent formability.
The following section will provide an overview of Ulbraseal 42 alloy.
Chemical Composition
The chemical composition of Ulbraseal 42 alloy is outlined in the following table.
|
Element |
Content (%) |
|
Nickel, Ni |
41 |
|
Manganese, Mn |
0.8 |
|
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 42 alloy.
|
Properties |
Metric |
Imperial |
|
Density |
8.11 g/cm3 |
0.293 lb/in3 |
|
Melting point |
1427°C |
2600°F |
Mechanical Properties
The mechanical properties of Ulbraseal 42 alloy are displayed in the following table.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
482 MPa |
69900 psi |
|
Yield strength |
275 MPa |
39900 psi |
|
Elongation at break |
28% |
28% |
|
Rockwell B hardness |
55 |
55 |
Thermal Properties
The thermal properties of Ulbraseal 42 alloy are given in the following table.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@30-300°C/86-572°F) |
4-4.7 µm/m°C |
2.22-2.61 µin/in°F |
Fabrication and Heat Treatment
Machinability
Ulbraseal 42 alloy can be readily machined by conventional techniques.
Forming
The alloy has good ductility and formability.
Welding
The alloy can be welded using conventional methods.
Forging
The alloy can be forged at 1204°C (2200°F). Care should be taken to prevent contamination of alloy due to sulfur in a furnace atmosphere.
Cold Working
The alloy has good ductility, and it can be readily cold-worked.
Annealing
Ulbraseal 42 alloy can be annealed at 788°C (1450°F) followed by air cooling.
Hardening
The alloy can be hardened due to cold working.
Other Designations
Other designations that are equivalent to Ulbraseal 42 alloy include the following:
Applications
The following are the list of applications of Ulbraseal 42 alloy:
-
Lamps and electron tubes
-
Automotive sealed beam headlights