Manganese Bronze A – UNS C67500

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication and Heat Treatment
     Annealing
     Cold Working
     Welding
     Forging
     Machinability
     Hot Working
Applications

Introduction

Manganese bronze is a type of brass that is chocolate brown in color. Manganese bronze alloys enhance the inside and outside appearances of buildings and last for a long time. They are available in many forms and are generally completed by waxing.

The UNS C67500 manganese bronze A alloy is a hot forgeable alloy with good corrosion resistance and high strength. The following datasheet provides an overview of this alloy.

Chemical Composition

The chemical composition of the UNS C67500 alloy is outlined in the following table.

Element Content (%)
Cu 58.5
Fe 1.4
Mn 0.1
Sn 1
Zn 39

Physical Properties

The following table shows the physical properties of the UNS C67500 alloy.

Properties Metric Imperial
Density 8.63 g/cc 0.312 lb/in³
Melting point 866°C 1590°F

Mechanical Properties

The mechanical properties of the UNS C67500 alloy are displayed in the following table.

Properties Metric Imperial
Hardness, Rockwell B 65 65
Tensile strength (annealed) 448 MPa 65000 psi
Tensile strength (hardened) 565 MPa 81900 psi
Yield strength (annealed) 207 MPa 30000 psi
Elongation at break (hardened) 25% 25%
Elongation at break (annealed, in 482.6 mm) 33% 33%
Machinability (UNS C36000 (free-cutting brass) = 100) 30 30

Other Designations

Equivalent materials to the UNS C67500 alloy are:

  • ASTM B124
  • ASTM B138
  • ASTM B283
  • ASTM F467
  • ASTM F468
  • SAE J461
  • SAE J463

Fabrication and Heat Treatment

Annealing

The UNS C67500 alloy is annealed between 427 and 593°C (800 and 1100°F).

Cold Working

The UNS C67500 alloy has poor cold working capacity.

Welding

Welding processes suitable for the UNS C67500 alloy include brazing, soldering, seam welding, spot welding, gas shielded arc welding, oxyacetylene welding and butt welding. Coated metal arc welding is not recommended for this alloy.

Forging

The UNS C67500 alloy is forged between 621 and 788°C (1150 and 1450°F). The hot forgeability rating for this alloy is 80.

Machinability

The machinability rating for the UNS C67500 alloy is 30.

Hot Working

The UNS C67500 alloy has excellent hot forming capacity.

Applications

The UNS C67500 alloy is used for pump components, bearings, heavy-duty mechanical components and valve stems.

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