The surface of hot-dip galvanized steel coils should be clean, free of cracks, inclusions, folds and other defects. The depth and width of surface defects must comply with relevant standards. The coating thickness is one of the important parameters of hot-dip galvanized steel coils and must comply with standard regulations. Appropriate testing methods are used to measure and verify the coating thickness.
Q235B is a common carbon structural steel. "Q" stands for yield strength and "235" means that the yield strength of this steel is 235MPa. Q235B galvanized steel coil is a layer of zinc coated on the surface of Q235B steel through hot-dip plating and other processes to enhance its corrosion resistance. The thickness of the zinc layer generally has a variety of specifications, such as Z30 - 275g/m² mentioned on Alibaba's English site.
S350GD+Z is a galvanized steel coil made of medium carbon low alloy high strength structural steel. Its hardness range is usually between HRC25 - 40. Compared with S280GD+Z, it has lower hardness, but better plasticity and toughness. However, its wear resistance and fatigue resistance are relatively poor, and its machinability and welding performance are good.
Hot-dip galvanized steel coil is a specially treated steel product produced by immersing the steel coil in a molten zinc bath to form a uniform zinc coating on its surface. This zinc coating not only provides excellent corrosion protection, but also improves the mechanical properties and aesthetics of the material. Hot-dip galvanized steel coil is widely used in many fields such as construction, automobiles, and home appliances, and is favored for its superior comprehensive performance.
This Aluminum-Zinc Coated Steel Coil (Galvalume Steel Coil) is manufactured using an advanced hot-dip galvalume process, which uniformly covers the steel surface with an aluminum-zinc alloy to form a dense protective layer. With aluminum accounting for 55% of the alloy composition, the product offers excellent corrosion resistance and weatherability.
