Reference guide

Continuous cast

Manganese bronze alloys can operate under very high loads and speeds. Besides excellent mechanical qualities, these alloys have good corrosion resistance. The standard alloy in this group is high tensile C86300, which is comprised of copper, manganese, aluminum, and iron. This combination raises the tensile strength to over 110,000 KSI.


Product description: Manganese bronze
Solids: 1/2" to 9" O.D.
Tubes: 1 1/8" to 9" O.D.*
Rectangles: Up to 15"
Standard lengths: 144"
Shape/Form: semi-finished, mill stock or near-net shapes, anode, bar stock, billet/bloom, squares, hex, plate, profile or structural shape, flats/rectangular bar

 *Consult mill for wall thickness

Typical uses

Automotive: weld guns
Builders hardware: brackets
Electrical: electrical hardware
Industrial: compressors, forming dies for wood pulp industry, frames, gears, hooks, lever arms, machinery, machinery parts (substituted for steel and malleable iron), machinery parts requiring high strength, pressing dies for wood pulp, struts, wear rings for pressing dies for wood pulp industry
Marine: boat parts, clamps, covers for marine hardware, propellers for salt and fresh water, rudders

Similar or equivalent specification

CDA ASTM SAE AMS Federal Military Other
C86500 B505
4860 QQ-C-390, C3;
MIL-C-22229, COMP 7  

Chemical composition

Cu%1 Pb% Sn% Zn% Fe% Ni%1,2 Al% Mn%
Chemical composition according to ASTM B505/B505M-23

1In determining Cu min., Cu may be calculated as Cu + Ni.   2Ni value includes Co.
Note: Cu + sum of named elements, 99.0% min. Single values represent maximums.


Copper alloy UNS No. Machinability rating Density (lb/in3 at 68 °F)
C86500 26 0.301

Mechanical properties

Mechanical properties according to ASTM B505/B505M-23
Tensile strength, min Yield strength, at 0.5% extension under load, min Elongation, in 2 in. or 50 mm min Brinell hardness (3000 kg load) Remarks
ksi MPa ksi MPa % typical BHN  
70 483 25 172 25 130

Physical properties

Physical properties provided by CDA 
*Field strength 16 kA/m
  US Customary Metric
Melting point - liquidus 1616 °F 880 °C
Melting point - solidus 1583 °F 862 °C
Density 0.301 lb/in3 at 68 °F 8.33 gm/cm3 at 20 °C
Specific gravity 8.33 8.33
Electrical conductivity 22% IACS at 68 °F 0.128 MegaSiemens/cm at 20 °C
Thermal conductivity 49.6 Btu/sq ft/ft hr/°F at 68 °F 85.8 W/m at 20 °C
Coefficient of thermal expansion 68-212 11.3 · 10-6 per °F (68-212 °F) 19.5 · 10-6 per °C (20-100 °C)
Specific heat capacity 0.09 Btu/lb/°F at 68 °F 377.1 J/kg at 20 °C
Modulus of elasticity in tension 15000 ksi 103400 MPa
Magnetic Permeability* 1.09 1.09

Fabrication properties

Fabrication properties provided by CDA
Technique Suitability
Soldering Fair
Brazing Fair
Oxyacetylene welding Poor
Gas shielded arc welding Poor
Coated metal arc welding Poor
Machinability rating 26

Thermal properties

Thermal properties provided by CDA
*Temperature is measured in fahrenheit.   **For stress relief, solution treatment and annealing - time is measured in hours/inch of thickness. For precipitation heat treatment - time is measured in hours.
Treatment Value* Time**
Stress relief 500  
Solution treatment   0

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