MOLTEN METAL-PLATED STEEL STRIP PRODUCTION METHOD

• Main Authors: TAKAHASHI, Hideyuki, YAMASHIRO, Kenji, TERASAKI, Yu, KAKU, Yoshihiko, KOYAMA, Takumi
• Format: Patent
• Language: English; French; German
• Published: 15.05.2024
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

Provided is a method for manufacturing a hot-dip metal-coated steel strip with which it is possible to inhibit a splash defect from occurring.The method for manufacturing a hot-dip metal-coated steel strip includes continuously dipping a steel strip S in a molten metal bath 4, injecting a gas from gas injection ports of paired gas wiping nozzles 10A and 10B arranged on both front and back surface sides of the steel strip S onto the steel strip S pulled-up from the molten metal bath 4 to adjust an adhesion amount of molten metal which adheres to both surfaces of the steel strip S, and continuously manufacturing a hot-dip metal-coated steel strip, in which, when an angle between an injection direction of the gas and a horizontal plane is defined as θ (°), a distance between a front edge of the gas injection port and the steel strip S is defined as D (mm), and a width of the gas injection port is defined as B (mm), the paired gas wiping nozzles 10A and 10B are operated under conditions in a range of θ being 10 to 60, a D/B of 3 to 12, and a D/B of equal to or less than (0.1 × θ + 9).