CC762S (CuZn25Al5Mn4Fe3-C) Alloy

High-Load Self-Lubricating Bearing Material with Graphite Plugs， ALLOY CuZn25Al5 – MANGANESE BRONZE

EN 1982 CC762S | DIN 1709 2.0598 | ASTM B505 C86300 | GB HTB3

Overview of CC762S (CuZn25Al5Mn4Fe3-C) Alloy

CC762S, designated as CuZn25Al5Mn4Fe3-C under EN 1982, is a high-strength manganese bronze (special brass) alloy engineered for extreme load-bearing applications at low sliding speeds. It is widely used for self-lubricating bearing bushings with graphite plugs, especially in heavy machinery where conventional lubrication is difficult or unreliable.

AS1565 C86300; ASTM B505, B271 – C86300; SAE 430B*; BS1400 – HTB3*; DIN 1709 – CuZn25Al5 *;

International equivalents include:

• EN 1982: CC762S – CuZn25Al5Mn4Fe3-C

• DIN 1709: 2.0598 – G-CuZn25Al5

• USA: ASTM B505 C86300

• UK: HTB3

• France: U-Z19A6

Typical casting methods:

• GS – Sand casting (also applicable to shell-mould casting)

• GZ – Centrifugal casting (for bushings and rings)

Thanks to its alloying elements—aluminum, manganese, and iron—CC762S offers exceptional strength, hardness, and wear resistance, outperforming standard brasses in high-stress environments.

Chemical Composition (Typical)

• Copper (Cu): balance

• Zinc (Zn): ~25%

• Aluminum (Al): ~5%

• Manganese (Mn): ~4%

• Iron (Fe): ~3%

• Trace elements: <1%

This composition places CC762S in the category of manganese aluminum bronze-type brasses, optimized for static and shock loads rather than high-speed sliding.

Mechanical Properties of CC762S

(Typical values – sand cast material)

These properties make CC762S one of the strongest bearing brasses available, suitable for heavily loaded bushings and wear components.

Why Choose CC762S as a Bearing Material?

1. High Stress & Load-Bearing Capability

CC762S is selected where very high surface pressure and shock loads are present. It resists deformation and edge loading far better than standard brass alloys such as CuZn40.

2. Self-Lubricating Performance (Graphite Plugged)

When manufactured as a self-lubricating bearing with graphite inserts, CC762S:

• Operates under dry or boundary lubrication

• Reduces maintenance and grease dependency

• Prevents seizure under intermittent motion

This makes it ideal for inaccessible or outdoor machinery.

3. Optimized for Low Sliding Velocities

• Recommended sliding speed: ≤ 0.5 m/s

• Best suited for oscillating, pivoting, or slow-rotating motion

⚠️ Not recommended for high-speed or continuous rotation applications.

4. Wear, Abrasion & Impact Resistance

The alloy performs exceptionally well in:

• Dusty environments

• Sand, soil, or debris exposure

• Repeated impact and vibration

5. Corrosion & Environmental Resistance

• Good resistance to water, motor oils, greases, and additives

• Suitable for industrial and marine-adjacent environments

• Not recommended for strong acids or >200 °C service temperatures

Casting Method Selection

Sand / Shell-Mould Casting (GS)

• Complex geometries

• Good dimensional stability

• Common for large bushings and structural parts

Centrifugal Casting (GZ)

• Ideal for bearing bushings, rings, and sleeves

• Dense microstructure

• Improved fatigue and wear performance

Specific Applications of CC762S in Machinery and Equipment

1. Construction & Earth-Moving Machinery

Typical parts

• Excavator arm bushings

• Boom and bucket linkage bearings

• Pivot bushings and wear plates

• Hydraulic cylinder glands

Equipment

• Excavators

• Loaders

• Bulldozers

• Cranes

Why CC762S?
Excavator arms and joints experience very high static loads, shock, and contamination. CC762S self-lubricating bushings with graphite plugs ensure long service life even under dirt, sand, and irregular lubrication.

2. Mining & Heavy Industrial Equipment

Typical parts

• Slow-running worm wheel rims

• Gears and cams

• Wear strips and guide plates

• Screw-down nuts

Equipment

• Crushers

• Mining drills

• Conveyors

• Heavy presses

Why CC762S?
Used where torque is high and speed is low, such as worm gears. The alloy withstands extreme contact stress and abrasive particles better than phosphor bronze.

3. Slide Rails & Guide Systems

Typical parts

• Slide rails

• Guide bushings

• Gibs and wear pads

Equipment

• Machine tools

• Hydraulic presses

• Wood pulp processing machines

Why CC762S?
For slow sliding, heavily loaded guideways, CC762S provides dimensional stability, impact resistance, and reliable dry-running performance.

4. Marine & Offshore Equipment (Low-Speed Components)

Typical parts

• Valve stems

• Shaft sleeves

• Flanges and clamps

Why CC762S?
Good resistance to erosion and corrosion combined with high mechanical strength, especially for low-speed marine mechanisms.

5. Other Heavy-Duty Mechanical Applications

• Bridge trunnion bushings

• Structural brackets and hooks

• Heavy electrical switch frames

• Industrial fastening and hold-down systems

Ideal for intermittent motion + high static load scenarios.

Limitations & Alternatives

Avoid CC762S when:

• Sliding speed is high (>0.5 m/s)

• Continuous rotation is required

• Operating temperature exceeds ~200 °C

Possible alternatives:

• Phosphor bronze – better for higher speeds

• Aluminum bronze – higher temperature resistance

• PTFE-based composite bearings – ultra-low friction

Summary: Why CC762S is a Preferred Heavy-Duty Bearing Alloy

CC762S (CuZn25Al5Mn4Fe3-C) is a proven, cost-effective solution for high-load, low-speed bearing applications, particularly when combined with graphite self-lubrication. It is widely used in construction machinery, mining equipment, guide systems, and industrial presses where strength, durability, and reduced maintenance are critical.

For optimal material selection, designers should evaluate:

• Load and contact pressure

• Sliding speed

• Environmental exposure

• Lubrication accessibility

Standards such as EN 1982 and ASTM B505 provide reliable guidance for specification and quality control.