Bronze Machining Techniques
23 October
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Manganese Bronze 863
Key Features
- Exceptionally strong
- Good wearing properties
- Suitable for hydraulic cylinder components
- Suitable for heavy duty bearings
- Reasonable corrosion resistance
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Key Features
- Exceptionally strong
- Good wearing properties
- Suitable for hydraulic cylinder components
- Suitable for heavy duty bearings
- Reasonable corrosion resistance
Overview
863 is a high strength manganese bronze or high tensile brass (HTB3). It is an exceptionally strong material that has higher hardness and strength ratings than even 304/316 stainless steel. 863 also has good wearing properties and good ductility, making it suitable for extra heavy-duty slow speed bearings and for hydraulic cylinder components. Good lubrication is required for components made from 863. This material has reasonable corrosion resistance, but de-zincification can occur under certain conditions.
Chemical Composition
| Element | Symbol | Range % | Nominal % |
| Copper | Cu | 60.0-66.0 | 63.0 |
| Aluminium | Al | 5.0-7.5 | 6.0 |
| Iron | Fe | 2.0-4.0 | 3.0 |
| Manganese | Mn | 2.5-5.0 | 3.5 |
| Tin | Sn | 0.2 maximum | |
| Lead | Pb | 0.2 maximum | |
| Nickel | Ni | 1.0 maximum | |
| Zinc | Zn | Balance |
Physical Properties
Metric
Imperial
| Material | Unit | Manganese Bronze 863/HTB3 |
| Tensile Strength Min | psi | 110000 |
| Yield Strength Min | psi | 62000 |
| Elongation Min | % | 14% |
| Hardness Min | BHN | 223 |
Comparative Specifications
BS1400 – HTB3*; AS1565 C86300; SAE 430*; JIS H5121 – CAC304C (HBsC4)*; DIN 1709 CuZn25Al5*
* Similar but not identical