C86300 (SAE 430B) Manganese Bronze: An Ideal Material for Bridge Bearing Plates

Bridge construction demands materials that can withstand immense forces while providing durability and reliability. One such material that excels in these aspects is C86300, also known as SAE 430B Manganese Bronze, conforming to ASTM B22 standards. This alloy has proven to be an excellent choice for manufacturing Bridge Bearing Plates, contributing to the structural integrity and longevity of bridges.

Composition and Properties:

C86300 Manganese Bronze is a high-strength alloy primarily composed of copper, manganese, and other elements. Its composition adheres to ASTM B22 standards, ensuring quality and consistency. The key properties that make C86300 well-suited for Bridge Bearing Plates include:

1. High Strength: The alloy’s composition imparts high tensile and yield strength, providing the necessary structural integrity for bearing heavy loads in bridge applications.
2. Corrosion Resistance: C86300 exhibits excellent resistance to corrosion, a crucial characteristic for materials exposed to the elements in bridge structures.
3. Wear Resistance: Manganese Bronze is known for its exceptional wear resistance, making it ideal for components that experience sliding or abrasive forces, such as those encountered in bridge bearings.
4. Machinability: The alloy’s machinability is another advantage, facilitating the manufacturing process of intricate components like Bridge Bearing Plates.

Application in Bridge Bearing Plates:

Bridge Bearing Plates play a critical role in facilitating the controlled transfer of forces between superstructures and substructures. The use of C86300 Manganese Bronze in manufacturing these plates enhances their performance in several ways:

1. Load-Bearing Capacity: The high strength of C86300 allows Bridge Bearing Plates to handle significant vertical and horizontal forces, ensuring the safety and stability of the bridge.
2. Low Friction: The inherent wear resistance and self-lubricating properties of Manganese Bronze contribute to reduced friction in the bearing plates. This is especially crucial for ensuring smooth and controlled movements in response to forces.
3. Longevity: C86300’s resistance to corrosion and wear translates to a longer service life for Bridge Bearing Plates, minimizing the need for frequent replacements and maintenance.
4. Compatibility with Graphite Inserts: When incorporating graphite inserts for further friction reduction, the compatibility of C86300 with these materials ensures optimal performance in various environmental conditions.

ASTM B-22 C91100 Bridge Wear Plates

C91100 is a type of bronze alloy, often referred to as Aluminum Bronze. Bridge wear plates made from this material are commonly used in heavy-duty structural applications, especially in bridges. These plates are known for their excellent wear resistance, high strength, and corrosion resistance, making them ideal for environments exposed to heavy loads and harsh conditions.

Here are some key properties of C91100 Aluminum Bronze used in bridge wear plates:

High Strength: The alloy has a high yield and tensile strength, making it capable of bearing heavy loads without deformation.
Wear Resistance: The material offers excellent resistance to wear and abrasion, which is essential for applications with constant friction or movement.
Corrosion Resistance: C91100 has good corrosion resistance, especially in marine and industrial environments, protecting against degradation over time.
Machinability: The alloy can be machined to precise tolerances, allowing for custom-fit applications in bridges.
These wear plates are often used in sliding or pivoting points of bridge structures, helping to distribute loads evenly and reduce the impact of wear on key components. Their durability ensures a long service life, which is critical for maintaining the safety and functionality of bridge structures.

The Bridge Bearing Plate consists of a bronze plate containing a unique lubricant that ensures permanent lubrication of the sliding surfaces. This design is vital for transferring both horizontal and vertical forces safely. The incorporation of graphite inserts in the bronze wear plate is a noteworthy feature that significantly reduces the friction coefficient, enhancing the overall efficiency of the bearing plate.

Key Specifications

The working temperature range for the specified application is -40°C to +300°C.

Bearing Horizontal Force:

Guided Type: Horizontal force is 10% of vertical bearing capacity.
Fixed Type: Horizontal force is 10% of vertical bearing capacity.
Vertical Bearing Capacity:

Available in various capacities ranging from 1000 kN to 20000 kN.
Displacement:

In Longitudinal Direction:
1000–2500 kN: 50/100 mm
3000–20000 kN: 50/100/150 mm
In Transverse Direction: ± 40 mm

Features

• Multi-Directional Movements:
• The Bridge Bearing Plate allows movements in any direction, providing flexibility in accommodating complex forces.
• Low Friction Coefficient:

The bronze plate with graphite inserts ensures a minimum sliding friction coefficient, contributing to the efficiency and longevity of the bearing plate.
PTFE Sheet with Lubricant:

The use of PTFE (Polytetrafluoroethylene) sheet with lubricant further reduces sliding friction, enhancing the overall performance of the bearing plate.
Suitability for Low-Temperature Regions:

• Designed to operate effectively in low-temperature regions, making it versatile for various environmental conditions.
  Homogeneous Effect on Concrete Reaction:
• The bearing plate has a consistent impact on concrete reaction, ensuring uniform support and load distribution.
  Long-Term Service:

The Bridge Bearing Plate is robust and durable, capable of providing long-term service without compromising performance.

Bridge Bearing Plates are specifically designed for structures where high vertical, horizontal, and lateral loads are required. They excel in applications involving large rotational structural displacements, making them suitable for complex bridge designs, including curved bridges, skew bridges, and right bridges.