Quality & Product Properties
In order to deliver quality products & meeting customer’s requirements, our suppliers are equipped with the latest fully-automated computer controlled cutting edge facilities and technologies. These tools guarantee products of the highest precision and quality for our customers.
Galvannealing
The surface of steel sheet can be coated with a zinc compound prior to reheating in an annealing process. Zn atoms diffuse into the Fe to create a Zn-Fe series alloy.
SPM & Chemical Treatment
In order to achieve a flat surface and elegant finish, the steel sheet is processed with a skin pass mill. In order to prevent the white rust, which often forms on the surface of activated zinc, and to improve corrosion resistance, the surface is coated with a Cr-free resin.
Hot-Dip Galvanizing
After passing through the annealing furnace, steel sheet is dipped into a zinc pot where molten Zn is coated onto the surface. The desired coating weight is achieved by removing excess zinc before solidification with high pressure air from an air knife.
Composition, Mechanical Properties, Coating Weight
The products are composed of various metal components and have various mechanical properties in accordance with the design standards depending on various sizes and uses, such as CQ, DQ, DDQ, structural steel and high tensile steel, and so forth. (No effects on components/mechanical properties from the post-treatment).
Formability
The hot-dip galvanized steel that is produced by vertical furnace, compared to the horizontal furnace-produced product, is superior in its formability, equally to cold-rolled steel. This allows many applications.
Paintability
The corrosion resistance of painted hot-dip galvanized steel is greatly affected by the pre-coating process. Anti-corrosion oil is commonly applied to untreated steel, so thorough degreasing is essential for reliable adhesion of surface coatings such as phosphate, chromate or Cr-free pre-treatment layers. In addition, a high quality phosphate film can also be attained on galvannealed steel in the form of iron-zinc alloy, which delivers exceptional coating adherence and corrosion resistance compared to commercial quality hot-dip galvanized steel.
