Aluminum Metal Flat Bar Bulb Bar
Aluminum flat bar
Aluminum metal flat bar is an aluminum profile with a flat cross-section. Its simple structure and ease of processing make it widely used in shipbuilding, primarily performing basic functions such as support, connection, and protection.
Core Application Scenarios
Ship Deck and Bulkhead Support: Below the deck and within the bulkheads of a ship, flat aluminum is often used as secondary beams or supporting ribs to evenly transfer loads borne by the deck and bulkhead to the primary structure, enhancing their rigidity and preventing deformation due to external forces.
Ship Superstructure Frame: In the framework of a ship's superstructure (such as the wheelhouse and crew quarters), flat aluminum can be used as components of columns and beams, forming the basic skeleton of the superstructure. Since superstructures are weight-sensitive, the lightweight nature of flat aluminum can reduce the overall weight of the ship while maintaining structural strength, thereby improving its navigational performance.
Equipment Mounting Base: Various equipment onboard, such as navigation equipment, communications equipment, and pumps, requires a stable mounting base. Flat aluminum can be cut and processed according to the equipment's size and installation requirements to create customized mounting bases, providing a secure support for the equipment and reducing displacement caused by vibration during navigation.
Alloy Selection
For marine applications, the most commonly used alloys for flat aluminum are 5-series aluminum alloys and 6-series aluminum alloys.
5-series aluminum alloys (such as 5083 and 5A06): These alloys, with magnesium as the primary alloying element, offer excellent seawater corrosion resistance and good weldability. They also possess moderate strength, meeting the requirements of marine environments and are particularly well-suited for areas in direct or indirect contact with seawater, such as deck supports and bulkhead structures.
6-series aluminum alloys (such as 6061 and 6082): These alloys, with magnesium and silicon as the primary alloying elements, offer high strength and excellent processability. Heat treatment can further enhance their strength. 6-series aluminum alloys are widely used in areas with high strength requirements and relatively mild corrosion environments, such as superstructure frames and equipment mounting bases.
Aluminum oblate
Bulb flat bar is a special aluminium boat extrusion with a cross-section consisting of a flat web and a semicircular (or nearly semicircular) spherical head. This unique cross-sectional shape provides excellent torsional and compressive resistance, making it an irreplaceable role in critical ship structures subject to complex loads.
Core Application Scenarios
Ship hull skeleton: Bulb-shaped aluminum is often used as ribs and longitudinals in key areas such as the side and bottom of a ship's hull, forming the hull's skeleton structure. During navigation, a ship's hull is subject to various loads, including wave impact, current resistance, and its own gravity. Bulb-shaped aluminum, with its excellent torsional and compressive resistance, effectively resists deformation caused by these loads, safeguarding the hull's structural integrity.
Ship hatch coamings and stiffeners: Ships' hatch coamings must withstand the weight of the hatch cover and the impact forces generated during cargo loading and unloading. Bulb-shaped aluminum can be used as stiffeners to enhance the rigidity and strength of the hatch coamings, preventing damage from excessive forces. Bulb-shaped aluminum can also be used as stiffener in bulkheads of cargo holds, ballast tanks, and other compartments on ships, improving their pressure resistance and ensuring stability when subjected to liquid or cargo pressure.
Ship propulsion system-related structures: Bulb-shaped aluminum is also used in structures such as bases and brackets. Propulsion systems generate significant vibration and torque during operation. Bulb-shaped aluminum, with its excellent torsional resistance, provides stable support for the propulsion system, reducing the impact of vibration on other ship structures and ensuring normal operation.
Alloy Selection
Given that bulb-shaped aluminum is primarily used in ships to withstand complex loads and harsh marine environments, the alloy selected must possess superior strength, corrosion resistance, and fatigue resistance. Series 5 high-strength aluminum alloys and series 7 aluminum alloys are commonly used.
5-series high-strength aluminum alloys (such as 5086 and 5454): These alloys build on the strength of 5-series aluminum alloys by optimizing their chemical composition and heat treatment processes to further enhance their strength and corrosion resistance while maintaining excellent weldability. They are suitable for applications such as ship hull frames and hatch coaming stiffeners, which are subject to heavy loads and harsh corrosive environments.
7-series aluminum alloys (such as 7075 and 7A04): 7-series aluminum alloys, with zinc as the primary alloying element, are among the strongest aluminum alloys currently available. They offer excellent tensile strength and fatigue resistance, but their corrosion resistance is slightly inferior to that of 5-series aluminum alloys. 7-series aluminum alloys are particularly well-suited for applications such as ship propulsion system foundations and brackets, where high strength is required and where corrosion can be mitigated through surface anti-corrosion treatments (such as spray coatings and anodizing).
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