Duplex Steel Hot-dip Galvanizing Technology
The hot-dip galvanizing technology for duplex steel is considered an environmentally preferable option for the process of steel coating. This technology not only protects steel from corrosion, but it also has numerous other benefits such as improved wear resistance and durability. Moreover, hot-dip galvanizing is carried out, for the most part, without the use of hazardous chemicals, requires minimal maintenance and has a long life without the need for additional treatments.
Duplex steel is an alloy steel, which is slightly more expensive than carbon steel, yet offers higher resistance to corrosion. This type of steel contains both ferritic and austenitic stainless steels, and is usually used in high-heat environments such as outdoor applications or piping. Hot-dip galvanizing technology is a preferred method of coating duplex steel as it offers greater resistance to corrosion and abrasion, as well as better protection against environment
contamination.
The process begins with the steel being cleaned to remove any dust and debris that may be present. The steel is further cleaned by chemical or mechanical means. This process is done to ensure that all the necessary elements are present for the zinc to adhere to and bond to the steel. The steel is then heated to between 300 - 480 degrees Celsius and is then exposed to a molten zinc bath. The heat from the zinc ‘sinterizes’ the steel which strengthens and increases durability. The zinc adheres to the steel at all angles, meaning that all walls of the steel are equal coated with zinc. This improves the corrosion resistance of the steel.
The thickness of the zinc coating depends on the amount of heat applied during the process, as well as the zinc bath composition. Typically, the thickness is around 85 – 120 microns. After the steel is dipped, it is cooled and inspected for surface defects. Once cooled, the galvanized steel goes through a curing process to further improve and maximize the corrosion protection.
The benefits of using hot-dip galvanizing technology are numerous. Galvanized steel is highly durable, has a long life, and requires minimal maintenance. Furthermore, the process is environmentally friendly as no toxic chemicals are used, and the zinc protects the metal from corrosion for years to come. In addition, it offers extra protection against abrasion and harsh elements, making it ideal for outdoor applications.
Duplex steel, when coated with hot-dip galvanizing technology, extends the life expectancy of the steel, improves its resistance to corrosion, and makes it more durable and reliable. Hot-dip galvanizing is a highly recommended option, as it provides an economical solution to improve the performance of the steel and is more efficient than other coating techniques. It is also important to note that hot-dip galvanizing reduces the costs associated with the maintenance and repair of the steel. Therefore, its use ensures the longevity of the steel while simultaneously providing great protection and aesthetic appeal.
