Densalloy DENS23 Tungsten Heavy Alloy

Topics Covered

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

Introduction

WHA alloys, known by the trade name Densalloys, are classified based on their magnetic permeability, those having magnetic permeability less than 1.05 and those having magnetic permeability greater than 1.05. There are totally four classes of WHA alloys, in which classes 1, 2 and 3 contain one grade of magnetic and one non-magnetic alloy. Class 4 consists of only magnetic alloys.

DENS23 is a WHA alloy belonging to Class 2 with a magnetic permeability of 1.02-1.05. This alloy exhibits low magnetic permeability and hence is non-magnetic in nature. Densalloys exhibit better ductility and machinability than pure tungsten. The tungsten content of this alloy varied from 89-97%, the remainder being nickel or iron. The standard forms in which the alloy is available are sheet, plate, pressed and sintered billet and sintered near net shape.

This datasheet will look into the chemical composition, properties and applications of Densalloy-DENS23.

Chemical Composition

The chemical composition of Densalloy DENS23 is given in the following table.

Element Content (%)
Tungsten, W 92.5
Nickel, Ni 5
Copper, Cu 2.5

Physical Properties

The following table discusses the physical properties of Densalloy DENS23.

Properties Metric Imperial
Density 17.66 gm/cm3 0.638 lb/in3

Mechanical Properties

The mechanical properties of Densalloy DENS23 are tabulated below.

Properties Metric Imperial
Tensile strength(annealed) 758 MPa 110 ksi
Yield strength(annealed) 551 MPa 80 ksi
Elongation at Break (1 inch (2.5 cm) gauge length) 2% 2%
Hardness, Rockwell C ≤33 ≤33

Other Designations

Some of the designations used to denote Densalloy DENS23 are listed below:

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

Fabrication

Machinability

DENS23 alloy is easily machinable into complex geometrical shapes using common metal cutting and shaping tools.

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 DENS23 is used in the following applications:-

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

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