“In terms of quantity, China's shipboard supply has basically met demand, but it has not yet achieved supply and demand correspondence.†At the 2008 Steel Industry Chain Strategic Development and Investment Summit held recently, Chen Changjun, Assistant to the President of the China Shipbuilding Industry Association, commented that the ship is currently in use. Steel demand situation. Chen Changji pointed out: “At present, China is only self-sufficient in terms of ordinary ships. Some high value-added steel plates include heterosexual ship plates, super-wide and ultra-long ultra-thin vessels, heavy plates, and large ball flat steels, T-shaped steels, and so on. With respect to products such as thick angle steel and other high-quality steel pipes, China's steel enterprises are still far from meeting domestic shipbuilding demand, which means that the supply and demand of ship steel have not yet achieved mutual alignment.â€
In the future, the domestic shipbuilding steel industry will show the following trends: 1. The large-scale ship has led to the trend of large-scale shipbuilding use. Generally, steel plates with a width of 3.5 to 4.5 meters are used in foreign countries, and even steel plates of 4.5 meters or more in width. In terms of length, foreign steel enterprises may take up to 22-24 meters in length, some of which are 26 meters in length, and they are required to be able to supply them in accordance with the length of yard production. 2. The requirements for corrosion resistance and higher service life of shipboard coatings to ensure the safety of the hull structure. With the official introduction of the new international norms for ballast tank coatings last year, the ship's coating requirements and standards were clearly included in the class conditions. There is a stricter and clearer guideline for the quality control of new shipbuilding coatings and coating construction. 3. In terms of profiles, the shipyard will increase the demand for large-sized, high-quality, corrosion-resistant ball flat steels and large unequal thickness angle steels.
Verbélet (Group), as a global specialist in surface treatment of marine steel plates and profiles, provides comprehensive surface treatment solutions for the above trends: 1. Shipboard upsizing is a major challenge to surface treatment, regardless of Virbilette (Group) The steel pretreatment line with painting and drying systems or the stand-alone roller conveyor type blasting device can handle ultra-wide plates up to 5 meters wide with a cleaning speed of 6 m/min. Specially designed throwing turbine position ensures faster, more uniform and thorough cleaning. Controlling rust removal and descaling to obtain a uniform, clean, shiny surface with a certain roughness is critical for subsequent painting and welding. Dust generated during shot blasting is discharged through an automatic filter unit where the contaminated air is filtered to a standard of less than 2 mg per cubic meter. In addition to the shot blasting machine, another important mechanism is the spray booth. Verbelett (Spray) paint booth can identify the width of various steel plates and profiles, and 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 sol- vents are filtered in an automatic filtration unit and VOC paint treatment facility to meet environmental standards. 2. After the steel plates are pre-processed, they will be made into the largest possible hull sections in the processable range. According to the new coating standard, after the pretreatment of blast plating and spray primer for marine steel plates, during the stage of hull segmentation and closure, it is necessary to perform secondary shot peening at the weld seam and apply a protective coating to prevent Corrosion performance standards. According to different application needs, Verbélet (group) provides large sandblasting houses and spray booths and handles giant hull sections weighing more than 100 tons. The mobile sandblasting machine, which also provides flexibility, is suitable for manual on-site weld repairs. The system has closed dust collection and vacuum recovery filters to keep the site clean and free of dust pollution. 3, Universal shot blasting machine can be used to deal with special shape profiles, steel beams and steel pipes. The throwing head is arranged to thoroughly remove rust and descale the rim and flange to ensure high adhesion and durability of the anticorrosive primer. (Velbertet Group provides information).
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