C67300 – Manganese Bronze
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C67300 – Manganese Bronze Brochure
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Descriptions
C67300 Manganese Bronze is a high-strength, copper-based alloy formulated with zinc, manganese, and lead to provide an outstanding combination of strength, wear resistance, corrosion resistance, and machinability. Designed for demanding engineering applications, this alloy performs exceptionally well under high-load, low-speed conditions where toughness and reliability are critical.
The addition of manganese improves corrosion resistance — particularly in seawater and marine environments — while lead enhances machinability, allowing precise, complex parts to be produced efficiently with minimal tool wear. Its high mechanical strength and excellent bearing properties make it suitable for bushings, bearings, gears, valve stems, and heavy-duty marine hardware.
With its warm, bronze-like finish and structural integrity, C67300 Manganese Bronze is used in both functional and decorative applications across marine, aerospace, automotive, and industrial machinery sectors.
Chemical Composition
C67300 Manganese Bronze is a high-strength copper–zinc alloy modified with manganese, lead, and trace elements to enhance its machinability, corrosion resistance, and mechanical properties. The presence of manganese improves seawater resistance, while lead ensures smooth machining and fine surface finish.
| Element | Composition (wt%) | Remarks |
|---|---|---|
| Copper (Cu) | 58.0 – 63.0 | Provides strength and corrosion resistance |
| Lead (Pb) | 0.40 – 3.0 | Improves machinability and surface finish |
| Tin (Sn) | ≤ 0.30 | Improves toughness and corrosion resistance |
| Zinc (Zn) | Balance | Primary alloying element |
| Iron (Fe) | ≤ 0.50 | Improves tensile strength |
| Nickel (Ni) | ≤ 0.25 | Enhances strength and corrosion resistance |
| Aluminum (Al) | ≤ 0.25 | Improves oxidation resistance |
| Manganese (Mn) | 2.0 – 3.5 | Increases hardness, strength, and seawater resistance |
| Silicon (Si) | 0.50 – 1.5 | Enhances wear resistance and deoxidation |
| Total (Cu + Alloying Elements) | ≥ 99.5 | Ensures purity and performance consistency |
Note: The combination of manganese and silicon significantly enhances strength, corrosion resistance, and wear performance, making C67300 ideal for marine and high-load engineering applications.
Mechanical, Physical & Fabrication Properties
C67300 Manganese Bronze exhibits excellent mechanical performance across a wide range of section sizes and manufacturing conditions. Its high strength, good ductility, and wear resistance make it suitable for heavy-duty mechanical, marine, and industrial components.
| Property | Typical Value | Remarks |
|---|---|---|
| Tensile Strength | 65 ksi (448 MPa) | High strength for load-bearing applications |
| Yield Strength | 40 ksi (276 MPa) | Excellent resistance to deformation under stress |
| Elongation | 12% | Good ductility for machining and forming |
| Hardness | Rockwell B 70 | Provides wear resistance and dimensional stability |
The combination of tensile and yield strength ensures that C67300 components can withstand heavy loads and impacts while maintaining precision and stability over prolonged service life.
Physical Properties
| Property | Typical Value |
|---|---|
| Density | 8.3 g/cm³ |
| Electrical Conductivity | 22% IACS |
| Thermal Conductivity | 95 W/m·K |
| Coefficient of Thermal Expansion | 19 × 10⁻⁶ /°C |
| Modulus of Elasticity (Tension) | 117,212 MPa |
These physical and mechanical properties provide excellent dimensional stability under mechanical stress, thermal cycling, and corrosive environments, making C67300 Manganese Bronze a highly reliable material for precision-engineered and high-load applications.
Applications
C67300 Manganese Bronze is used across industries that demand high strength, corrosion resistance, and wear protection. Its mechanical robustness and excellent machinability make it ideal for high-load, low-speed, and marine applications where reliability and dimensional stability are essential.
- Marine Industry: Propeller shafts, valve seats, pump shafts, stern tubes, and general marine hardware.
- Industrial Applications: Bearings, bushings, gears, cams, wear plates, pump parts, shaft bushings, sleeve bearings, thrust bearings, clutch bearings, drive shafts, and spindles.
- Aerospace: Landing gear components, strut bushings, actuator fittings, and other high-load mechanical parts requiring long-term performance.
- Other Uses: Fasteners, lead screw nuts, connecting rods, precision-machined hardware, and components needing high dimensional stability and durability.
With its exceptional combination of strength, machinability, and corrosion resistance, C67300 Manganese Bronze remains one of the most versatile alloys for both functional and structural engineering applications.
Standards & International Equivalents:
C67300 Manganese Bronze is recognized under several international material standards for wrought brass and bronze alloys used in marine, aerospace, and industrial applications. These standards ensure consistent chemical composition, mechanical performance, and machinability across manufacturers and product forms.
| Standard Organization | Designation / Specification | Description / Coverage |
|---|---|---|
| UNS | C67300 | Unified Numbering System designation for Manganese Bronze |
| SAE | J461, J463 | Specifications for wrought copper alloys and their mechanical properties |
| ASTM | B249 | Standard specification for general requirements for wrought copper and copper-alloy rods, bars, and shapes |
| Indian Standard (IS) | No direct IS equivalent | Similar alloys are used for marine and industrial applications under equivalent composition ranges |
Note: C67300 conforms to ASTM B249 for dimensional and mechanical integrity and is widely recognized under SAE J461/J463 for high-performance bronze alloys used in engineering, aerospace, and marine systems.
Common Names & International Identifiers
C67300 Manganese Bronze is widely recognized for its combination of strength, machinability, and corrosion resistance. It is often referred to by various trade and technical names across global markets and engineering standards.
- Common Names: Manganese Bronze, Leaded Silicon Manganese Bronze
- Trade Designations: UNS C67300, SAE J461, SAE J463
- CDA Alloy Number: 673
C67300 is commonly used in marine, aerospace, and heavy engineering applications where high load-bearing strength and resistance to corrosion or galling are required. Its excellent machinability and warm bronze-like appearance also make it suitable for decorative or architectural components.
Common Product Forms & Dimensions
C67300 Manganese Bronze is supplied in a comprehensive range of solid, hollow, and custom-extruded profiles to suit diverse industrial, marine, and aerospace applications. Products can be supplied in as-extruded or cold-drawn condition depending on mechanical requirements.
| Shape | Size Range (mm) | Remarks |
|---|---|---|
| Solid Round Bars | Dia 10 mm up to 120 mm | Commonly used for shafts, bushings, and heavy-duty components |
| Solid Rectangle Bars | 10 × 12 mm up to 100 × 50 mm | Used for machined blocks, wear plates, and structural parts |
| Solid Hex Bars | A/F 10 mm up to 100 mm | Ideal for fasteners, fittings, and mechanical connectors |
| Solid Square Bars | A/F 10 mm up to 90 mm | Used in decorative, architectural, and precision-machined components |
| Hollow Bars |
Outer Diameter: 30 mm – 120 mm Inner Diameter (Round): 20 mm – 80 mm |
Available in round, hexagonal, and square cross-sections |
| Profiles & Sections | As per customer drawings | Custom extrusions for specialized industrial and marine parts |
| Bar Length | Up to 4 meters | Delivered in straight lengths, as-extruded or cold-drawn |
Surface Finishing Options
- Straight Knurling – Available depending on size and shape feasibility
- Cross Knurling – Provided on request for improved grip or decorative appearance
Note: All C67300 Manganese Bronze products are supplied with Mill Test Certificates (MTCs) and are manufactured in compliance with ASTM B249 and SAE J461/J463 standards. Custom tolerances and finishes are available upon request.
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