Manganese Bronze Alloy C67300
Copper Alloy No. C67300
Manganese Silicon Bronze , CDA 673
Chemical Composition % by weight
Manganese Silicon Bronze , CDA 673
Chemical Composition % by weight
| Element | Nominal | Minimum | Maximum |
| Copper | 60.5 | 58 | 63 |
| Lead | 1.7 | .40 | 3 |
| Iron | - | - | .50 |
| Tin | - | - | .30 |
| Zinc | Remainder | ||
| Nickel (incl. Co) | - | - | .25 |
| Aluminum | - | - | .25 |
| Manganese | 2.75 | 2 | 3.5 |
| Silicon | 1 | .5 | 1.5 |
Applications
Hydraulic piston shoes, cylinder liners, cams.
Common Fabrication Processes
Machining
Mechanical Properties
Typical for 2" Bar As Extruded Temper
| Hardness* | Rockwell B Scales | 78 |
| Tensile Strength** | KSI | 75 |
| Yield Strength** (.5% EAU) | KSI | 36 |
| Elongation** | % in 2 inch | 26 |
**Test values are nominal approximations and depend on specimen size and orientation.
Physical Properties
| Thermal Conductivity | BTU/ (sq ft-ft-hr-F) | 58 |
| Specific Heat | BTU/lb/ºF @ 68F | .09 |
| Thermal Expansion | Per °F from 68 F to 572 F | .000011 |
| Density | lb/cu in @ 68 F | .293 |
| Electrical Conductivity* (Annealed) | % IACS @ 68 F | 23 |
| Modulus of Elasticity (Tension) | KSI | 16,000 |
*Volume basis
Fabrication Properties
| Capacity for being cold worked | Fair |
| Suitability for being joined by: | Soldering/Good |
| Brazing/Not Recommended | |
| Oxyacetylene Welding/Not Recommended | |
| Gas Shielded Arc Welding/Fair | |
| Coated Metal Arc Welding/Not Recommended | |
| Resistance Welding | Spot/Good |
| Seam/Good | |
| Butt/Good |