C95500 Aluminum Bronze For Heavy-Duty Roller
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C95500 Aluminum Bronze Bushings for Heavy-Duty Roller Applications
Introduction to C95500 Aluminum Bronze
C95500 Nickel Aluminum Bronze — also known as Aluminum Bronze D, Alloy 9D, or UNS C95500 — is one of the most robust non-ferrous casting alloys available today. Its metallurgical design blends copper with aluminum, iron, nickel, and manganese, producing a combination of strength, wear resistance, and corrosion resistance that is ideally suited for heavy-duty roller applications in mining, marine, and industrial processing environments.
Key Advantages
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High mechanical strength (tensile strength up to 758 MPa when heat-treated)
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Excellent toughness for high shock and impact loads
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Outstanding corrosion resistance in seawater and industrial chemicals
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Superior wear resistance for abrasive environments
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Good machinability and weldability for complex component designs
C95500 Aluminum Bronze Chemical Composition & Alloy Design
The performance of C95500 stems from its precisely controlled composition, each element serving a functional purpose.
Table 1: C95500 Chemical Composition (ASTM B505/B505M-23)
| Element | Min (%) | Max (%) | Function |
|---|---|---|---|
| Aluminum (Al) | 10.0 | 11.5 | Strength, oxidation resistance |
| Copper (Cu) | 78.0 | — | Base metal for ductility and thermal conductivity |
| Iron (Fe) | 3.0 | 5.0 | Wear resistance, hardness |
| Manganese (Mn) | 3.50 | — | Improves toughness, wear resistance |
| Nickel (Ni)¹ | 3.0 | 5.50 | Toughness, corrosion resistance |
| Others | — | 0.50 | Trace elements only |
| Cu + Named Elements | 99.5 | — | Alloy balance |
¹ Nickel value includes cobalt.
Why It Matters:
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Nickel + Aluminum work together to improve toughness and corrosion resistance.
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Iron + Manganese improve hardness and wear resistance without making the alloy overly brittle.
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Precise control is critical — even minor deviations can reduce fatigue strength or corrosion performance.
Requirements for Heavy-Duty Rollers
Heavy-duty rollers operate in high-load, high-shock, and abrasive conditions, such as:
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Mining conveyor systems
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Steel mill material handling
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Marine loading equipment
Performance Criteria:
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Wear Resistance — withstands friction and abrasion.
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Load-Bearing Capacity — resists deflection under heavy static/dynamic loads.
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Fatigue Strength — survives millions of load cycles without cracking.
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Impact Resistance — tolerates sudden high-force impacts.
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Environmental Resistance — corrosion protection in marine/chemical exposure.
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Thermal Stability — retains properties over a wide temperature range.
Figure 1: Matching Material Properties to Roller Demands
| Requirement | C95500 Performance Match |
|---|---|
| Wear Resistance | ★★★★★ |
| Load Capacity | ★★★★★ |
| Fatigue Strength | ★★★★☆ |
| Impact Resistance | ★★★★★ |
| Corrosion Resistance | ★★★★★ |
| Thermal Stability | ★★★★☆ |
Why C95500 Excels in Roller Applications
C95500 meets or exceeds every critical roller requirement:
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Strength: Tensile strength up to 110 ksi (758 MPa), yield strength up to 62 ksi (427 MPa) when heat-treated.
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Toughness: Nickel content significantly improves impact resistance for shock-loaded rollers.
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Wear Resistance: Iron-rich intermetallic phases increase abrasion resistance.
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Corrosion Resistance: Forms a self-healing aluminum oxide layer in seawater.
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Fatigue Resistance: Handles cyclic stresses with minimal crack propagation.
Mechanical & Physical Properties Of C95500 Aluminum Bronze
Table 2: C95500 Key Properties
| Property | As-Cast | Heat-Treated | Notes |
|---|---|---|---|
| Tensile Strength | 655 MPa | 758 MPa | High load capability |
| Yield Strength | 290 MPa | 427 MPa | Resists deformation |
| Elongation (%) | 10% | 15% | Adequate ductility |
| Brinell Hardness | 192 HB | 208 HB | Wear resistance |
| Fatigue Strength | 214 MPa | 260 MPa | Long life under cycles |
| Density | 7.53 g/cm³ | — | Stable |
| Thermal Conductivity | 42 W/m·K | — | Heat dissipation |
| Coeff. Thermal Expansion | 16.2 µm/m°C | — | Dimensional stability |
Manufacturing Processes & Best Practices
C95500 is castable using:
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Centrifugal Casting — best for cylindrical rollers, fine grain structure.
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Continuous Casting — for bars, tubes, and plates with uniform properties.
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Sand Casting — for complex geometries, though with slightly coarser grain.
Recommendation: For rollers, centrifugal casting is preferred for structural integrity and uniformity.
Available Forms:
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Solid bars (½” to 16″ OD)
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Hollow tubes
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Plates/rectangles (up to 16″ width)
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Custom near-net shapes
Limitations & Design Considerations
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Friction Coefficient: Higher than phosphor bronze → ensure good lubrication for high-speed rollers.
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As-Cast Brittleness: Heat treatment/stress relief is critical to avoid fatigue cracking.
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Galvanic Corrosion: Avoid pairing with carbon steel in wet conditions; stainless steel or titanium are preferred.
Cost & Lifecycle Benefits
While machining costs are higher than free-cutting brass (machinability ~50%), C95500 bushings last significantly longer in abrasive, corrosive, and high-load environments. This results in:
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Fewer replacements
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Less downtime
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Lower total cost of ownership (TCO) over equipment life
C95500 Nickel Aluminum Bronze bushings are an ideal choice for heavy-duty rollers where high strength, toughness, wear resistance, and corrosion resistance are all critical.
When paired with proper casting method, post-casting heat treatment, and correct lubrication strategy, this alloy delivers maximum service life in the harshest industrial environments.
