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C86300 Manganese Bronze Casting
C86300 Manganese Bronze Casting
C86300 (UNS C86300, CDA 863, Manganese Bronze, Grade C High Tensile Brass) is the highest-strength commercial brass casting alloy, achieving tensile strengths of 620–690 MPa with yield strengths of 310 MPa. The high manganese (2.5–5.0%) and aluminium (0.5–1.5%) content, combined with iron additions (2.0–4.0%), creates a heavily strengthened alpha-beta microstructure. C86300 is specified for the most demanding structural brass casting applications: large marine propellers, heavy worm wheels, high-load slide bearings, and structural marine hardware subject to shock loading.
Alloy Overview
C86300 achieves its exceptional strength through multi-element solid solution and precipitation hardening in the beta phase. The high Mn and Al additions produce intermetallic precipitates that substantially increase yield strength. At 620 MPa UTS, C86300 exceeds many medium-carbon steels while offering the inherent advantages of brass: non-magnetic, corrosion resistant, and directly castable into complex shapes. The high alloy content reduces machinability to approximately 8% CDA – carbide tooling is essential.
Material Composition
| Element | Min % | Max % | Typical % | Role |
|---|---|---|---|---|
| Copper (Cu) | 60.0 | 66.0 | 63.0 | Primary matrix |
| Zinc (Zn) | Balance | Balance | ~28.5 | Strength, structure |
| Manganese (Mn) | 2.5 | 5.0 | 4.0 | Primary strengthener |
| Aluminium (Al) | 0.50 | 1.50 | 1.0 | Strengthener, corrosion resistance |
| Iron (Fe) | 2.0 | 4.0 | 3.0 | Grain refiner, strengthener |
| Nickel (Ni) | – | 1.5 | 0.5 | Toughness |
| Lead (Pb) | – | 0.20 | – | Impurity limit |
| Tin (Sn) | – | 0.20 | – | Impurity limit |
| Silicon (Si) | – | 0.10 | – | Impurity |
| Phosphorus (P) | – | 0.05 | – | Deoxidant |
Mechanical and Physical Properties
| Property | Sand Cast | Gravity Die | Standard |
|---|---|---|---|
| Tensile Strength (MPa) | 620 min | 690 min | ASTM B584 / EN 1982 |
| 0.2% Yield Strength (MPa) | 310 min | 370 min | ASTM E8 |
| Elongation (%) | 14 min | 16 min | ASTM E8 |
| Hardness (HB) | 130–160 | ASTM E10 | |
| Density (g/cm³) | 8.28 | – | |
| Electrical Conductivity (%IACS) | 5–8 | ASTM B193 | |
| Thermal Conductivity (W/m·K) | 58 | – | |
| Melting Range (°C) | 855–885 | – | |
| Machinability (%) | 8 | CDA scale | |
International Equivalent Grades
| Standard | Designation | Common Name |
|---|---|---|
| USA (UNS/ASTM B584) | C86300 / CDA 863 | High Tensile Brass Grade C |
| Europe (EN 1982) | CC766S | CuZn37Mn3Al2Fe1-C |
| Germany (DIN 1709) | CuZn37Mn3Al2Fe1-C | Hochfestes Sondermessing |
| UK (BS 1400) | HTB3 | High Tensile Brass Casting Grade 3 |
| India (IS 318) | HTB4 | High Tensile Brass Grade 4 |
| Japan (JIS H5111) | HBsC4 | High Strength Brass Casting 4 |
| ISO | CuZn37Mn3Al2Fe1-C | High Tensile Brass Grade C |
| China (GB/T 1176) | ZCuZn38Mn2Pb2 | 高强锰黄铜 |
Applications
C86300 castings are used for: large marine propellers and propeller hubs for commercial and naval vessels; heavy worm wheels and worm gear blanks; high-load sleeve and flange bearings; offshore structural components; marine winch and windlass components; heavy pump impellers in abrasive service; and any application requiring the highest tensile strength available in a copper-zinc casting alloy.
Pricing
US$ 11.50 per kilogram (CIF major port, indicative). MOQ: samples from 1 piece; production from 50 pieces.
Quality and Certification
ASTM B584 (C86300); EN 1982 CC766S; IS 318 HTB4; ISO 9001:2015. Mechanical test certificates, spectrometric analysis. Carbide tooling required for all machining. ISO 9001:2015. EN 10204 3.1 MTR with every batch.
Related Grades
- C85700 Yellow Brass Casting
- C46400 Naval Brass Casting
- C83600 Red Brass / LG2 Casting
- C86500 Manganese Bronze Casting
- Brass Castings – All Grades
Request a Quote
Price: US$ 11.50/kg. Email: info@elecaccs.com | www.elecaccs.com