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 |