Densalloy DENS25 Tungsten Heavy Alloy

Topics Covered

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

Introduction

WHA alloys are known as Densalloys commercially. These alloys are classified into four classes and each class is further divided into magnetic and non-magnetic alloys based on their magnetic permeability. Those alloys having magnetic permeability greater than 1.05 are considered magnetic. Class 4 Densalloy consists of magnetic alloys alone.

DENS25 is a WHA alloy belonging to Class 3 having a magnetic permeability of 1.01-1.02. Since the magnetic permeability of this alloy is less than 1.05, it is classified as non-magnetic densalloy. Densalloys exhibit better ductility and machinability than pure tungsten. The composition of tungsten in this alloy is 95%, rest of it is composed nickel and copper. 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-DENS25.

Chemical Composition

The chemical composition of Densalloy DENS25 is given in the following table.

Element Content (%)
Tungsten, W 95
Nickel, Ni 3.5
Copper, Cu 1.5

Physical Properties

The following table discusses the physical properties of Densalloy DENS25.

Properties Metric Imperial
Density 18.16 gm/cm3 0.656 lb/in3

Mechanical Properties

The mechanical properties of Densalloy DENS25 are tabulated below.

Properties Metric Imperial
Tensile strength 820 MPa 119 ksi
Yield strength 517 MPa 75 ksi
Elongation at Break (1 inch (2.5 cm) gauge length) 3% 3%
Hardness, Rockwell C ≤34 ≤34

Other Designations

Some of the designations used to denote Densalloy DENS25 are listed below:

  • MIL-T-21014D
  • ASTN B777-87

Fabrication

Machinability

DENS25 alloy is easily machinable into complex 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 DENS25 is used in the following applications:

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

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