Standards let buyers compare galvanized steel coil across suppliers. ASTM A653 covers hot-dip coil in commercial, lock-forming, drawing, and structural grades, with coating designations G30–G360. EN 10346 uses DX51D–DX57D for forming and S250GD–S550GD for structure, with Z coatings. JIS G3302 uses SGCC, SGCH, and SGC grades. Grades are not interchangeable: yield strength, elongation, and coating tests differ. Quote the full designation—standard, grade, coating mass, treatment, dimensions.
