Marine Hardware Supplier Heavy Duty Mooring Marine Double Horn Bitt Cross Cast Iron Bollards Marine Bollard

Material and Manufacturing:

Core Material: Cast Iron
This bollard is clearly marked "Cross Cast Iron." Its material selection is primarily based on the unique requirements of maritime applications. Its specific characteristics are as follows:
High Strength and Wear Resistance: Cast iron has a high carbon content (2%-4%), resulting in a dense structure after casting. It can withstand the intense tension and repeated friction of mooring ships without deforming or wearing out.
Corrosion Resistance: Conventional cast iron undergoes surface treatments (such as galvanizing and painting) to enhance its resistance to seawater corrosion. Some high-end models may utilize ductile iron, which offers superior toughness and corrosion resistance compared to ordinary gray cast iron, making it suitable for long-term exposure to marine environments.
Cost and Process Compatibility: Cast iron has good fluidity and is easily cast into complex and asymmetrical structures like the "double horn." This allows for high production efficiency and meets the high-volume demand for maritime equipment.

The production process strictly adheres to iron casting manufacturing standards while also integrating the performance requirements of maritime hardware. The key steps are as follows:
Mold Making: Based on the design drawings of the double-angle bollard, a sand mold (usually resin sand or water glass sand) is created. The mold must accurately replicate the "double-angle" structure, mounting holes, and surface texture to ensure that the final dimensions meet maritime regulations (such as ISO standards or classification society certification requirements).
Cast Iron Smelting: Pig iron, scrap steel, and coke are placed in a cupola or medium-frequency induction furnace in appropriate proportions and heated to 1300-1500°C to melt and form molten iron. Desulfurizers and inoculants are added during this process to adjust the molten iron composition, reduce impurities, and enhance the toughness of the casting.
Pouring: Molten iron is slowly poured into the sand mold along the mold's gate. After the molten iron cools naturally to room temperature, the sand mold is broken and the casting is removed. The resulting "rough" part may have burrs and risers (excessive portions left after the molten iron solidifies) on the surface. Rough Machining and Finishing: Using mechanical tools (such as lathes and milling machines), the casting risers are removed and surface burrs are ground. Critical areas such as the bollard's corners and bottom mounting surface are precision machined to ensure dimensional tolerances within ±1mm, meeting installation and mooring requirements.

Heat Treatment and Strengthening: The casting is placed in a heat treatment furnace for annealing or normalizing. This involves heating to 800°C-900°C and then slowly cooling to eliminate internal stresses generated during the casting process and prevent cracking during subsequent use. Ductile iron is also subjected to a "quenching and tempering" treatment to further enhance strength.

Surface Corrosion Protection: This is a critical step in maritime equipment. Common methods include:

Hot-dip galvanizing: The casting is immersed in molten zinc (approximately 450°C), forming a zinc layer on the surface that isolates the cast iron from seawater, providing a corrosion protection life of over 10 years. Spray Anti-Corrosion Paint: Use a marine-grade epoxy zinc-rich primer and polyurethane topcoat. Apply 2-3 even coats to a thickness of at least 80μm to enhance salt spray and UV resistance.
Quality Inspection and Certification:
Appearance Inspection: Inspect the surface for defects such as cracks, pores, and shrinkage.
Performance Testing: Tensile testing and hardness testing (such as the Brinell HB hardness test) are performed to ensure that the strength meets "Heavy Duty" standards.
Certification Review: Certification by international classification societies (such as LR, ABS, and DNV) is required. In some regions, compliance with local maritime authority regulations (such as China CCS) is also required before shipment.

Features:

The Marine Double Horn Bitt features high strength, easy installation, and wide applicability. Details are as follows:
High Strength and Durability: Typically made of ductile iron or cast steel, these materials offer excellent strength and wear resistance, can withstand the immense forces of mooring, and can withstand long-term use in harsh environments.
Multiple Mooring Line Capability: The double-horn design allows for simultaneous mooring of multiple lines, meeting the mooring needs of various vessels and improving mooring convenience and safety.
Space-Saving: The small base footprint makes it suitable for limited space in docks, berths, and other locations. Installation within a limited work area improves space utilization.
Concrete Fillable: Some double-horn bollards can be filled with concrete to further increase their weight and stability, enhancing their ability to withstand the tensile and impact forces generated during mooring.
Adaptable to Different Environments: Ductile iron bollards offer excellent corrosion resistance and are suitable for warm environments, while cast steel bollards are more suitable for cold climates and are easier to weld and maintain. The appropriate material can be selected based on different climate conditions and usage environments. Compliant with Multiple Standards: Products typically comply with international standards such as ISO 13795, as well as certifications from various classification societies, such as CCS, ABS, BV, and LR. This ensures product quality and safety, enabling its use in ports and terminals worldwide.
Low Maintenance: Due to the durability and corrosion resistance of its material, double-angle bollards require minimal maintenance under normal use. Regular surface inspections and simple anti-corrosion treatments are required to ensure long-term reliable performance.

Technical Parameters:

Application Scenarios:

Double-angle bollards for ships are widely used in various ports, terminals, and related areas. The following is an introduction to their specific application areas:
Ports and terminals: These include container terminals, passenger ports, and fishing boat terminals. They are used for mooring ships, ensuring safety and stability during docking, undocking, mooring, shifting, and maneuvering.
Industrial terminals: These include industrial oil and gas terminals, bulk mineral and liquid terminals, and others. They can withstand the significant pull of moored vessels and meet the mooring needs of industrial material transport vessels.
Marine engineering: In marine engineering projects such as offshore oil platforms and wind farms, they are used to secure offshore platforms and wind farms, ensuring their stability in harsh marine environments.
Yacht marinas: They provide mooring points for yachts. Their aesthetically pleasing appearance and reliable performance meet the needs of yachts and meet the overall environmental requirements of yacht marinas.
Protective engineering: At the edges of water bodies such as coastlines, rivers, and lakes, bollards stabilize soil or rocks, preventing water from eroding the shoreline soil or rocks and protecting shore structures from erosion. Bridge Construction: During bridge construction, bollards can serve as temporary anchoring points when piers are needed, facilitating the transportation of construction personnel and materials and improving construction efficiency.

Maritime Education and Training: In practical training at maritime institutions, bollards are important teaching aids for ship mooring. Through simulated bollard installation and mooring operations, students can intuitively understand the mechanical principles and safety regulations of ship berthing.

Support and Services:

Warranty Service: Manufacturers generally offer a one-year warranty. During this period, if a bollard is damaged due to quality issues, the manufacturer will repair, replace, or refund the product. For example, Hebei Tiannuo's custom-made cast iron bollards come with a one-year, three-year warranty and a lifetime warranty.

Repair Service: Manufacturers typically have a professional repair team to provide prompt repair services when a bollard malfunctions or becomes damaged. These experienced engineers can quickly and accurately locate faults and develop repair plans, providing high-quality maintenance and service for all types of equipment.

Spare Parts Availability: To ensure the repair and maintenance of bollards, manufacturers maintain a sufficient inventory of spare parts.

Technical Support: Manufacturers provide technical consultation and guidance, including support for installation, commissioning, operation, and maintenance.

Quick Response: Most manufacturers promise to respond promptly to customer service requests. Regular return visits: Some manufacturers will make regular return visits to customers to understand the use of bollards and customer needs, promptly solve problems encountered by customers during use, and collect customer feedback in order to continuously improve product and service quality.

In addition, we offer a range of services to complement our mooring bollards products. These include custom design and engineering, installation and commissioning, and repairs and upgrades. Our goal is to provide a comprehensive solution to meet your mooring needs, from product selection to ongoing support.
Any question please let us know ,our JinCheng maritime will provide you the best service with 7*24 hours ~