Super Alloy Ulbraseal 52 (UNS K95050)

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.

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