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Posco starts up ultra-thick slab caster
Apr 18, 2011
A two-strand ultra-thick slab caster capable of casting slabs in thicknesses up to 400 mm was started up in March at Posco's Pohang Works in Korea. The caster will be used for the production of high quality slabs for applicatios in the oil and shipbuilding industries.
In November 2007, Posco Pohang Iron & Steel Company Ltd. (Posco) ordered a two-strand ultra-thick, slab caster capable of casting up to 1.3 million tons of a wide range of carbon steel grades per year. The caster, designed with a metallurgical length of 24 m, was erected in the Continuous Casting Plant No. 3 (CCP3) in the Pohang Works.
Slabs are cast with a thickness of either 250 mm or 400 mm, and at widths from 1,100 mm to 2,200 mm. The caster features a wide range of technological packages. This includes the flexible adjustment of the mold-oscillation parameters, mold-level control, slab-width adjustment and a module for fast slab-thickness changes. A maximum in secondary cooling flexibility is the basis for achieving highest slab surface quality.
The real time calculatin of the temperature at any point within the strand allows the optimum secondary-cooling setpoints to be defined. Dynamically adjustable
3d sprays prevent overcooling of the slab corners for all slab widths. The application of revolver rollers, which do not require spray-water cooling, supports a more gradual and uniform cooling of the slab surface. This minimizes the tendency of surface defects when casting crack-sensitive steel grades or ultra-thick slabs.
The particularly high internal quality of the slabs is ensured by the unique machine concept. A 3.6 m long vertical section at the top of the strand-guide system promotes the floating of undesired impurities present in the liquid steel. The final strand-solidification position can be precisely determined. This allows the roller-gap taper in the area of final strand solidification to be dynamically and precisely adjusted, which minimizes strand segregation as required for high-end products.
The described slab caster is the only ultra-thick slab caster in Korea. This start-up follows the commissioning of the 400 mm ultra-thick slab caster in June 2010 at Qinhuangdao Shouqin Metal Material Co., Ltd. in Qinhuangdao City, Hebei Province, China.
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