"In terms of quantity, China's shipboard supply has basically met the demand, but has not yet achieved supply and demand." At the 2008 Steel Industry Chain Strategic Development and Investment Summit held recently, Chen Changyu, Assistant President of China Shipbuilding Industry Association, commented on the current use of the ship. Demand for steel.
Chen Changyu pointed out: "At present, China is only self-sufficient in ordinary shipboards. In some high value-added steel plates, including heterosexual ship plates, ultra-wide and ultra-long ultra-thin ship plates, wide and heavy plates, and large ball flat steel, T-shaped steel, etc. Regarding the products such as thick angle steel and high-quality steel pipes, China's steel enterprises are far from meeting the domestic shipbuilding demand. That is to say, the supply and demand of ship steel have not yet achieved mutual alignment."
In the future, domestic shipbuilding steel will show the following trends:
1 The large-scale ship has led to a trend toward large-scale shipboard specifications. Foreign countries generally use steel plates with a width of 3.5-4.5 meters, and even steel plates with a thickness of 4.5 meters or more. In terms of length, foreign steel enterprises can reach a maximum length of 22-24 meters, and some are 26 meters, and are required to be supplied according to the shipyard production.
2 The shipboard coating has higher corrosion resistance and service life requirements to ensure the safety of the hull structure. With the official introduction of new specifications for international ballast tank coatings last year, shipboard coating requirements and standards were clearly incorporated into class conditions. There is a more rigorous and clear guide for quality control of new shipbuilding coatings and coating construction. 3. In terms of profiles, shipyards have large-scale, high-quality, high-corrosion-resistant ball flat steel, large-scale unequal thickness angle steel The demand will increase.
Wheelabrator (Group), a global surface treatment specialist for marine steel and profile, offers comprehensive surface treatment solutions for these trends:
1 The large size of the ship is the biggest challenge to the surface treatment. Verbelet (Group) can handle up to 5 meters in width, whether it is a steel pretreatment line with a painting and drying system or a single roller conveyor type shot blasting machine. Extra-wide sheet with a cleaning speed of 6 m/min. The specially designed head turbine position ensures the fastest, most even and thorough cleaning effect. Controlling rust and descaling to achieve a uniform and clean surface with a certain roughness is critical for subsequent painting and welding. The dust generated during the shot blasting process is discharged through an automatic filtering unit in which the contaminated air is filtered to achieve a standard of less than 2 mg per cubic meter. Ship board pretreatment line In addition to the shot blasting machine, another important mechanism is the spray booth. The Velberette (Group) spray booth can identify the width of various steel plates and profiles, automatically adjust the nozzle distance, and then spray the primer in a continuous, high-speed manner, which can greatly reduce the waste of paint. Painted dust and dissolved materials are filtered in an automatic filter unit and VOC paint processing equipment to meet environmental standards.
2 After the steel plates are pre-machined, they will be made into as large a mass hull segments as possible within the treatable range. According to the new coating standard, in addition to the pre-treatment of shot blasting and spray primer, the marine steel plate needs to be shot peened at the welded joint in the hull section and closing stage, and coated with a protective paint to prevent Corrosion performance standards. Depending on the application, Wheelabrator (Group) offers large blasting rooms and spray booths to handle massive hull sections weighing over 100 tons. It also provides a flexible mobile blasting machine for on-site manual weld refilling. The system's closed dust collection and vacuum recovery filtration keeps the site clean and dust free.
3 General-purpose shot blasting machines can be used to treat specially shaped profiles, steel beams and steel pipes. The throwing head is arranged to thoroughly rust and descale the rim and flange to ensure high adhesion and durability of the anticorrosive primer.
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