Super Alloy Ulbraseal 42

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:

  • ASTM B388
  • ASTM F30

Applications

The following are the list of applications of Ulbraseal 42 alloy:

  • Lamps and electron tubes
  • Automotive sealed beam headlights

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