Foreign marine steel plate purchasers have strict requirements on the surface quality and product size of LR gr. A marine steel plate. The main user of LR gr. A marine steel plate export is Korea, so they have more strict requirements on the surface quality of marine steel plate. In order to ensure the surface quality of LR gr. A marine steel plate exported, the following process improvement measures are proposed:
(1) Strengthen the regular inspection of mold flux to ensure the physical and chemical properties of mold flux and prevent slab surface defects caused by the fluctuation of mold flux properties.
(2) Stabilize continuous casting process and reduce vibration marks of continuous casting slab.
(3) Strengthen the surface quality inspection of LR gr. A marine steel plate slab, and the continuous casting slab with unqualified surface is not allowed to enter the heating furnace.
(4) Ensure the heating time and temperature in the production of LR gr. A marine steel plate.
(5) Ensure the phosphorus removal quality of high-pressure water.
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