Production method of zinc-aluminum-magnesium coating strip steel

• Main Authors: TIAN ZHIWEI, SHAO YANZE, GU TIAN, TAN WENZHEN, LIU CHUNYU, GUAN SHUQIAO, ZHANG QIMING, ZHOU GUOPING, CHI YONGQING
• Format: Patent
• Language: Chinese; English
• Published: 10.09.2021
• 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

The invention relates to a production method of zinc-aluminum-magnesium coating strip steel. The production method comprises the following steps that in a strip steel coating plating process, after a steel substrate passes through an air knife, slow cooling, slow cooling and rapid cooling are sequentially carried out, and in the slow cooling, the strip steel is cooled to 290-300 DEG C; and in the slow cooling, the cooling speed is 3-6 DEG C/s. By controlling the cooling rate of the specific area of the coating, the problem of black spot defects on the strip steel plate surface can be effectively solved, and the product surface quality is guaranteed. 一种锌铝镁镀层带钢的生产方法，带钢镀层涂镀过程，钢基体过气刀后，依次进行慢冷、缓冷、快冷，所述慢冷，将带钢冷却至290-300℃；所述缓冷，冷却速度为3-6℃/s。通过控制镀层特定区域的冷却速率，能有效解决带钢板面黑点缺陷问题，保障产品表面质量。