Aluminum bulb flat bar for shipbuilding is an aluminum material with a spherical shape on one side. In shipbuilding, it is mainly used as a reinforcing rib. Aluminum bulb flat has high strength and good stability, it can effectively improve the strength and rigidity of the hull structure without adding too much weight, and resist various external forces that the ship is subjected to during navigation.

The aluminum alloys commonly used for bulb flat aluminum for shipbuilding include 5083, 6005, 6061 and 6082. These aluminum alloys have good strength, corrosion resistance and processability, and are suitable for shipbuilding and marine environments. And the certificated of aluminum bulb flat bar for shipbuilding including BV, CCS, DNV, LR, ABS, RINA and so on.

Common sizes of aluminum bulb flat bar include 50X4 (5#), which means that the width of the spherical flat steel is 50mm, the ball head height is 16mm, and the thickness is 4mm; 60X5 (6#), width 60mm, ball head height 19mm, thickness 5mm; 70X5 (7#), width 70mm, ball head height 21mm, thickness 5mm, etc. There are also many specifications such as 80X5 (8#), 90X5.5 (9#), 100X6 (10#), 120X6.5 (12#), 140X7 (14a), 140X9 (14b), etc., and the length is usually 5-15m.

Main features of bulb flat aluminum for shipbuilding:

- Lightweight: Compared with steel, aluminum alloy has a low density, which helps to reduce the weight of the hull and improve fuel efficiency.

- Strong corrosion resistance: Suitable for marine environment, especially in seawater and humid air, it shows good corrosion resistance.

- Good processing performance: easy to weld, cut, and bend, which is convenient for the assembly and manufacture of ship structures.

- High strength: After proper heat treatment, it has high mechanical strength to meet the load-bearing requirements of ship structures.

- Low maintenance cost: Due to corrosion resistance, it has a long service life and low maintenance frequency.

In shipbuilding, bulb flat aluminum is widely used. It is mainly used in key parts of the hull structure such as reinforcement ribs and keels. For example, a large number of vertical bulb-flat aluminum are welded inside the hull as a reinforcement structure to prevent the hull from being deformed due to external force extrusion or impact. At the same time, bulb-flat aluminum is also welded on the ground and side walls of each deck as reinforcement ribs. In addition, bulb-flat aluminum is often used in the bulkheads and compartments of ships to enhance the strength and stability of these parts.