كيفية التمييز بين لفائف الحديد المجلفن عالية الجودة ومنخفضة الجودة
I. Visual Inspection: Pre-Analysis Quality Level Based on Appearance Data The good steel coils are visible and show a definite “regularity”, where worse-quality ones are found to have a lot of imperfections that are easy to detect when the product is displayed. Surface Color and Luster The surface of high-quality galvanized steel coils is uniformly […]