C61400 Aluminum Bronze
C61400 Aluminum Bronze
Self-lubricating bronze bearings are engineered for applications where external lubrication is impractical. Solid lubricants are compressed and molded directly into the bearing to guarantee a maintenance-free product. No additional lubrication is necessary.
C61400 Aluminum Bronze Bush – High Strength & Corrosion Resistant
C61400 Aluminum Bronze: The Ultimate Guide to Strength, Wear, and Corrosion Resistance
This high-performance alloy has become a cornerstone solution for critical applications where strength, durability, and corrosion resistance are paramount. Known internationally by designations like QAl9-4 (China) and CuAl8Fe3 / CW303G (Europe), C61400 offers an exceptional blend of properties that make it indispensable in forms like C61400 bushings and plates.
What is C61400 Aluminum Bronze? The Science Behind the Strength
C61400 is a copper-based alloy meticulously engineered with key elemental additions. Its chemical composition is not a random mix; it’s a finely tuned recipe for performance.
Chemical Composition of C61400 (ASTM B150)
| Element | Content (%) | The Role it Plays in Performance |
| Copper (Cu) | 88.0 – 92.5% | The base metal, providing excellent thermal and electrical conductivity and inherent corrosion resistance. |
| Aluminum (Al) | 6.0 – 8.0% | The Game-Changer. Forms a tough, self-healing aluminum oxide (Al₂O₃) layer on the surface, providing exceptional resistance to corrosion, scaling, and wear. |
| Iron (Fe) | 1.5 – 3.5% | Acts as a grain refiner, significantly increasing the alloy’s tensile strength, hardness, and resistance to creep (deformation under long-term stress). |
| Manganese (Mn) | ≤ 1.0% | Improves casting and hot working properties and further enhances corrosion resistance. |
| Impurities | Pb ≤ 0.01%, P ≤ 0.015% | Kept extremely low to prevent brittleness and ensure stability, especially at elevated temperatures. |
This precise balance gives C61400 its remarkable mechanical and physical properties.
A Practical Guide to Fabricating C61400 Plate
While incredibly robust, C61400 requires proper handling during fabrication to preserve its superior properties.
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Welding: Gas Tungsten Arc Welding (GTAW or TIG) is the preferred method. Use an appropriate aluminum bronze filler rod (e.g., ERCuAl-A2). Crucially, the interpass temperature must be kept below 150°C (300°F) to prevent the iron phase from oxidizing, which can cause embrittlement in the weld zone.
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Machining: The high aluminum content can make C61400 “sticky,” leading to tool galling. Use sharp, hard carbide tooling with positive rake angles. A consistent and generous application of coolant is mandatory. Slower cutting speeds (15–25 m/min) are recommended to manage heat and prevent tool wear.
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Heat Treatment:
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Annealing: To relieve stress from cold working, heat the material to 700–750°C (1290–1380°F) followed by slow cooling.
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Hot Working: Hot rolling is typically performed between 1045–1110°C (1910–2030°F) to refine the grain structure for optimal strength.
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Unpacking the Mechanical and Physical Properties
Data tables are useful, but understanding the implications of that data is what matters for real-world applications.
Typical Mechanical & Physical Properties of C61400
| Property Category | Typical Value | Why This Matters for Your Application |
| Tensile Strength | ≥ 550 MPa (80,000 psi) | Superior to many stainless steels and most other bronzes. It can handle high-stress loads without fracturing, essential for structural parts. |
| Yield Strength | ≥ 275 MPa (40,000 psi) | Indicates the point of permanent deformation. Its high yield strength ensures components maintain their shape under heavy operational loads. |
| Elongation | 30% – 40% | A measure of ductility. This high elongation allows the material to absorb shock and impact energy without cracking—crucial for components in heavy machinery. |
| Hardness (Brinell) | 150 – 190 HB | Provides excellent resistance to surface indentation and abrasive wear, extending the life of components like wear plates and bushings. |
| Density | 7.78 g/cm³ (0.281 lb/in³) | Lighter than steel and many nickel alloys, offering a strength-to-weight advantage in mobile and marine applications. |
| Thermal Conductivity | 75 W/m·K | Efficiently dissipates heat, making it an excellent choice for heat exchanger tube sheets and components near high-temperature sources. |
The Core Advantage: Why Choose C61400 Over Alternatives?
When selecting a material, you’re often weighing options. Here’s how C61400 stands out.
C61400 vs. Other Materials: A Comparative Look
| Feature | C61400 Aluminum Bronze | Standard Carbon Steel | 316 Stainless Steel | Tin Bronze (e.g., C90500) |
| Seawater Corrosion | Excellent (self-passivating oxide layer) | Poor (requires coating, rusts easily) | Good (can suffer from pitting/crevice corrosion) | Good |
| Wear Resistance | Excellent (high hardness, low friction) | Fair (requires hardening/lubrication) | Fair (prone to galling) | Good (softer, lower load capacity) |
| Strength (Tensile) | High (~550 MPa) | Varies (can be high, but with trade-offs) | High (~580 MPa) | Moderate (~310 MPa) |
| Anti-Fouling | Good (copper content resists marine growth) | Poor | Poor | Excellent |
| Machinability | Good (produces small, manageable chips) | Good | Fair (work hardens) | Excellent |
C61400 hits the sweet spot: it delivers strength comparable to stainless steel while offering superior wear performance and the anti-corrosion and anti-fouling benefits of a copper alloy.
C61400 in Action: Key Applications
The theoretical benefits of C61400 translate into tangible performance in two primary forms: bushings and plates.
1. C61400 Aluminum Bronze Bushings: The Heart of Moving Systems
A bushing (or bush) is a sleeve bearing that reduces friction and wear between moving parts. C61400 is the ideal material for bushings in high-load, corrosive, and low-lubrication environments.
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Marine Propulsion Systems: Used for rudder bearings and propeller shaft bushings, where they constantly resist the abrasive combination of saltwater, sand, and high mechanical loads.
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Heavy Construction Machinery: Found in excavator arm pivot pins and track roller bushings, they withstand immense impact loads and dirt ingress, often with minimal maintenance.
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Chemical Pumps & Valves: As pump housing liners and valve stem guides, they endure corrosive fluids and abrasive slurries that would quickly destroy lesser materials.
The Advantage: C61400 bushings can extend the service life of equipment by over 30% compared to traditional tin bronzes, all while reducing the dependency on constant lubrication.
2. C61400 Aluminum Bronze Plates: The Resilient Structural Barrier
As a plate material, C61400 provides a robust, flat surface for structural and industrial applications, available in thicknesses from under 1mm to over 25mm.
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Marine & Offshore Structures: Used as tube sheets in seawater condensers and heat exchangers. The plate provides a strong, corrosion-proof barrier to separate fluids, while its high thermal conductivity ensures efficient heat transfer.
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Mining Equipment: Serves as wear-resistant liner plates in chutes, hoppers, and screening equipment, where it must endure the constant impact and abrasion of ore and rock.
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Chemical Processing Vessels: Used as a liner for pressure vessels containing acidic or otherwise corrosive liquids, often providing a more cost-effective solution than high-nickel alloys.
Case in Point: In desalination plants, C61400 plates are fabricated into tube sheets that support thousands of condenser tubes. These components have a documented service life exceeding 15 years in constant contact with highly corrosive brine, with no recorded instances of stress corrosion cracking.
Fabrication and Processing: Getting the Most from C61400
C61400’s versatility extends to its fabrication. However, following best practices is key to unlocking its full potential.
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Casting: Well-suited for sand and investment casting to create complex near-net-shape parts like bushings.
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Forging & Rolling: Hot working between 1045-1110°C (1910-2030°F) refines the grain structure, enhancing density and mechanical properties for plates and bars.
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Welding: Readily weldable, but Gas Tungsten Arc Welding (GTAW or TIG) is recommended to protect the aluminum content from oxidation and ensure a strong, ductile weld.
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Machining: It produces small, brittle chips, making it easier to machine than “gummy” materials like stainless steel. Use high-speed steel (HSS) or carbide tooling with ample coolant for the best results.
Your Partner in Performance Materials
Choosing the right material is the first step toward engineering excellence. C61400 Aluminum Bronze offers a powerful and reliable solution for your most demanding challenges, combining mechanical strength, wear resistance, and exceptional corrosion protection in one versatile package.
For expert guidance on selecting the right C61400 aluminum bronze solution for your project, from custom-machined bushings to high-performance plates, contact the specialists at bronzeoilless.com. We help you turn material science into a competitive advantage.
