Method of manufacturing galvanized sheet iron

• Main Authors: LA JOUNG HYUN, HAN CHEON HA, KANG CHUN KU, LEE KYOUNG HO, PARK MIN SUH
• Format: Patent
• Language: English; Korean
• Published: 08.03.2022
• Subjects: ALLOYS; 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; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The present invention provides a method for manufacturing a galvanized iron sheet having excellent plating adhesion. The method for manufacturing a galvanized iron sheet according to one embodiment of the present invention includes a step of preparing a cold rolled steel sheet, a step of annealing the cold rolled steel sheet, a step of galvanizing the annealed cold rolled steel sheet, and a step of cooling the galvanized cold rolled steel sheet, wherein the annealing step is performed in consideration of the relation between a dew point in a furnace and an annealing temperature. 본 발명은, 우수한 도금 밀착성을 가지는 용융아연도금 강판의 제조 방법을 제공한다. 본 발명의 일 실시예에 의하면, 상기 용융아연도금 강판의 제조 방법은, 냉연강판을 제조하는 단계; 상기 냉연강판을 소둔 열처리하는 단계; 상기 소둔 열처리된 냉연강판을 용융아연도금하는 단계; 및 상기 용융아연도금된 냉연강판을 냉각하는 단계;를 포함하고, 상기 소둔 열처리 단계는, 로내 노점과 소둔 열처리 온도의 관계를 고려하여 수행된다.