Densalloy SD175 Tungsten Heavy Alloy

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication
     Machinability
     Welding
     Cold Working
Applications

Introduction

SD175 is a WHA alloy belonging to Class 2 with a magnetic permeability of 4.5-5. This alloy exhibits high magnetic permeability and hence is magnetic in nature. Densalloys exhibit better ductility and machinability than pure tungsten.

The tungsten content of this alloy varies from 89-97%; the remaining is made of copper, nickel or iron. The standard forms in which the alloy is available are pressed and sintered billet, sintered near net shape, sheet and plate.

This datasheet will look into the chemical composition, properties and applications of Densalloy-SD175.

Chemical Composition

The chemical composition of Densalloy SD175 is given in the following table.

Element Content (%)
Tungsten, W 92.5
Nickel, Ni 5.25
Iron, Fe 2.25

Physical Properties

The following table discusses the physical properties of Densalloy SD175.

Properties Metric Imperial
Density 17.62 gm/cm3 0.637 lb/in3

Mechanical Properties

The mechanical properties of Densalloy SD175 are tabulated below.

Properties Metric Imperial
Tensile strength(annealed) 827 MPa 120 ksi
Yield strength(annealed) 551 MPa 80 ksi
Elongation at Break (1 inch (2.5 cm) gauge length) 6% 6%
Hardness, Rockwell C ≤33 ≤33

Other Designations

Some of the designations used to denote Densalloy SD175 are listed below:

  • MIL-T-21014D
  • ASTN B777-87
  • AMS-7725B

Fabrication

Machinability

SD175 alloy is easily machinable into complex geometrical shapes using common metal cutting and shaping tools. A suitable coolant should be used while machining this alloy.

Welding

These alloys cannot be welded due to the vast difference in the welding and binder phase.

Cold Working

This alloy can be cold worked by the process of swaging.

Applications

Densalloy SD175 is used in the following applications:

  • Radiation shielding
  • Aircraft counter balances
  • Racing weights
  • Boring bars
  • Ordnance applications
  • Well lodging.

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