1. Industry
Send to a Friend via Email

Your suggestion is on its way!

An email with a link to:

http://metals.about.com/od/properties/a/Copper-Alloys-In-Marine-Environments.htm

was emailed to:

Thanks for sharing About.com with others!

Discuss in my forum

Copper Alloys in Marine Environments

What copper alloys resist corrosion in salt water environments?

By

Copper has good resistance to corrosion in marine environments and in seawater with moderate flow velocities. These properties are enhanced by alloying copper with nickel, iron, manganese, zinc (brass), lead, beryllium and other metals.

Copper alloys used in marine applications can be categorized into four groups:

  1. Copper-Nickels
  2. Bronzes
  3. Brasses
  4. Copper-Beryllium

Some alloys, such as leaded brasses, have excellent machinability, while others are made to enhance strength, wear resistance, anti-galling and cold formability. In general, however, copper containing alloys are relatively easier to machine than other metals and alloys.

Applications:
Typical applications for copper-containing alloys in marine environments include:

  • heat exchangers and condensors
  • seawater piping
  • hydraulic tubing
  • pump and valve components
  • bearings
  • fasteners
  • marine fittings
  • propellers
  • shafts
  • offshore sheathing
  • aquaculture cages

Copper Alloys for Marine Environments (Content Wt. %)

Alloy EN No. or Trade Name UNS No. Cu Ni Fe Mn Zn Al Sn Other
Cu-Ni CW352H C70600 Bal. 10 1.5 1 - - - -
Cu-Ni CW353H C71640 Bal. 30 2 2 - - - -
Cu-Ni CW354H C71500 Bal. 30 0.7 0.7 - - - -
Cu-Ni-Cr Def Stan 02-824 - Bal. 30 0.8 0.8 - - - Cr: 1.8
Cu-Ni-Cr - C72200 Bal. 16 0.7 0.7 - - - Cr: 0.5
Cu-Ni-Al Nibron Special™ - Bal. 14.5 1.5 0.3 - 3 - -
Cu-Ni-Al Def Stan 02-835 C72420 Bal. 15 1 5 - 1.5 - Cr: 0.4
Cu-Ni-Sn - C72900 Bal. 15 - - - - 8 -
Phosphor Bronze CW453K C52100 Bal. - - - - - 8 P: 0.3
Phosphor Bronze CW451K C51000 Bal. - - - - - 5 P: 0.2
Silicon Bronze CW116C C65500 Bal. - - 1 - - - Si: 3
Aluminum Silicon
Bronze
CW302G C64200 Bal. - - - - 7.5 - Si: 2
Cast Nickel
Aluminum Bronze
CC333G C95800 Bal. 4 4.5 - - 9 - -
Gunmetal CC491K C83600 Bal. - - - 5 - 5 Pb: 5
Aluminum Brass CW702R C68700 78 - - - Bal. 2 - As: 0.04
Naval Brass CW712R C46400 61 - - - Bal. - 1 Pb
Aluminum-Nickel-
Silicon Brass
CW700R/
Tungum®*
C69100 83 1.2 - - Bal. 1 - Si: 1
Dezincification Resistant
Brass
CW602N C35330 62 - - - Bal. - - Pb: 2
As: 0.06
Manganese Bronze
(High Tensile Bronze>
CW721R C67500 58 - 0.8 1.5 Bal. 1 0.7 Pb: 1
Proprietary Alloy UR 30™ - 64 - - - Bal. 0.6 0.6 Various
Copper-Beryllium CW101C C17200 Bal. - - - - - - Be: 1.9
Other: 0.5

*Tube only

Source: Copper Development Association. Copper Alloys for Marine Environments. Publication No. 206 May 2011.
URL: http://www.copperinfo.co.uk/marine/downloads/pub-206-copper-alloys-for-marine-environments.pdf

  1. About.com
  2. Industry
  3. Metals
  4. Properties & Specifications
  5. Metal Properties
  6. Copper Alloys in Marine Environments

©2014 About.com. All rights reserved.