Bronze Alloys - Bronze NES833 Properties, Fabrication and Applications

Bronzes are copper-based alloys. Major alloying elements are often, but not always, zinc and tin. They offer a combination of properties such as high strength, hardness, corrosion resistance and wear resistance.

Aluminium Bronzes

Copper- aluminium alloy are commonly known as Aluminium Bronzes. These alloys cover a range of copper-based alloys in which the primary alloying element is up to 14% aluminium. The four major groups of Aluminium Bronzes are:

  • Single phase alloys containing less than 8% Aluminium.
  • Two-phase or duplex alloys containing 8 to 11% Aluminium. These alloys also frequently have additions of Iron and Nickel to increase strength. This group contains casting alloys AB1 and AB2, the wrought alloys CA105, CA104 and Naval Engineering Standard (NES) alloys (NES 747 when cast and the wrought form NES 833).
  • The low magnetic permeability Aluminium Silicon alloys.
  • The Copper Manganese Aluminium alloys with good castability.

Alloy NES833

Bronze Alloy NES833 is an Aluminium Bronzes with good ductility and impact strength. It also has superior corrosion resistance.

Chemical Composition of Bronze Alloy NES833

Table 1. Typical chemical composition for bronze alloy NES833

%

NES833

Iron (Fe)

4.20 max

Aluminum (Al)

9.30 max

Manganese (Mn)

0.30 max

Nickel (Ni)

4.20 max

Copper (Cu)

Balance

Properties of Bronze Alloy NES833

Mechanical Properties of Bronze Alloy NES833

Table 2. Typical mechanical properties for bronze alloy NES833

Grade

NES833

Tensile Strength

600 - 760 MPa

Proof Stress

400 - 530 MPa

Elongation A50 mm

15 - 5 %

Hardness Vickers

170 - 220 HV

Physical Properties of Bronze Alloy NES833

Table 3. Typical physical properties for bronze alloy NES833

Property

Value

Density

7.5 g/cm3

Electrical Resistivity

0.172 x 10-6 Ω.m

Thermal Conductivity

42 W/m.K

Alloy Designations

Bronze Alloy NES833 corresponds to the following designations:

European

British

Proprietary

CW307G

DGS1043

Hidurax

Corrosion Resistance of Bronze Alloy NES833

Bronze Alloy NES833 has high corrosion resistance, particularly in marine environments. Bronze Alloy NES833 is immune to chloride stress corrosion cracking.

This alloy also has excellent resistance to cavitation erosion.

Temperature Resistance of Bronze Alloy NES833

Bronze Alloy NES833 largely retains its strength and hardness up to 400°C.

It is also resistant to high temperature scaling at up to 1000°C.

Fabrication of Bronze Alloy NES833

Welding and Joining of Bronze Alloy NES833

Bronze Alloy NES833 is fully weldable by common welding methods.

Machinability

Bronze Alloy NES833 has good machinability.

Applications of Bronze Alloy NES833

Bronze Alloy NES833 is typically used in:

  • Marine Valves
  • Pumps
  • Weapons handling systems
  • Couplings
  • Fasteners
  • Gears
  • Marine propeller shafts

Supplied Form

Bronze Alloy NES833 is typically supplied by Aalco in the following form:

  • Hexagon Bar
  • Round Rod

DISCLAIMER

This Data is indicative only and must not be seen as a substitute for the full specification from which it is drawn. In particular, the mechanical property requirements vary widely with temper, product and product dimensions. The information is based on our present knowledge and is given in good faith. However, no liability will be accepted by the Company is respect of any action taken by any third party in reliance thereon.

As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose.

Any advice given by the Company to any third party is given for that party’s assistance only and without liability on the part of the Company. Any contract between the Company and a customer will be subject to the company’s Conditions of Sale. The extent of the Company’s liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.

This information has been sourced, reviewed and adapted from materials provided by Aalco - Ferrous and Non-Ferrous Metals Stockist.

For more information on this source, please visit Aalco - Ferrous and Non-Ferrous Metals Stockist.

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