Manganese Bronze Alloy C67500
Copper Alloy No. C67500
Manganese Bronze A , CDA 675
Chemical Composition % by weight
Manganese Bronze A , CDA 675
Chemical Composition % by weight
Element | Nominal | Minimum | Maximum |
Copper | 58.5 | 57 | 60 |
Lead | - | - | .20 |
Iron | 1.4 | .8 | 2 |
Tin | 1 | .8 | 2 |
Zinc | 39 | Remainder | |
Aluminum | - | - | .25 |
Manganese | .1 | .05 | .50 |
Applications
Automotive: Clutch disks, pump rods, shafting.
Hardware: balls, valve stems and bodies.
Common Fabrication Processes
Hot forging and pressing, hot heading and upsetting, machining.
Mechanical Properties
Typical for 1" Rod Half Hard (20%) Temper
Hardness* | Rockwell B Scales | 90 |
Tensile Strength** | KSI | 84 |
Yield Strength** (.5% EAU) | KSI | 60 |
Elongation** | % in 2 inch | 19 |
**Test values are nominal approximations and depend on specimen size and orientation.
Physical Properties
Thermal Conductivity | BTU/ (sq ft-ft-hr-F) | 61 |
Specific Heat | BTU/lb/ºF @ 68F | .09 |
Thermal Expansion | Per °F from 68 F to 572 F | .0000118 |
Density | lb/cu in @ 68 F | .302 |
Electrical Conductivity* (Annealed) | % IACS @ 68 F | 24 |
Modulus of Elasticity (Tension) | KSI | 15,000 |
*Volume basis
Fabrication Properties
Capacity for being cold worked | Poor |
Capacity for being hot formed | Excellent |
Hot forgeability rating (forging brass =100) | 80 |
Suitability for being joined by: | Soldering/Excellent |
Brazing/Excellent | |
Oxyacetylene Welding/Good | |
Gas Shielded Arc Welding/Fair | |
Coated Metal Arc Welding/Not Recommended | |
Resistance Welding | Spot/Good |
Seam/Fair | |
Butt/Good |