In-line galvanizing (ILG) is a continuous method of applying a protective zinc coating to steel, a process which is directly integrated into the manufacturing line. Unlike traditional batch hot-dip galvanizing, where finished components are dipped, ILG integrates the galvanizing step directly into the manufacturing line. 

This results in superior coating quality and efficiency. From a sustainability perspective, ILG streamlines production, reduces energy consumption, and minimizes waste, while extending the product's lifespan.

An o2Oh's group company, U.S.-based Superior Technologies’ (STI) Zinc-Tech™ is a proprietary ILG technology. A key feature of Zinc-Tech is its high degree of adaptability. By integrating our galvanizing equipment into existing tube-making facilities, it's possible to upgrade a company's production line to a continuous ILG steel tube manufacturing facility, maximizing the use of their current assets and enabling the creation of higher-value products.

Daiwa Steel Tube Industries (DSTI) in Japan, a core company of o2Oh, has combined Zinc-Tech™ with tube-making equipment to create its own proprietary continuous ILG steel tube manufacturing facility, known as the "Daiwa Z Process." The diagram below illustrates its proprietary method.

In step 5, the inside of the steel tube is coated with molten zinc while still in a flat sheet form, and in step 8, the outside is coated with molten zinc after it has been formed into a steel tube. 

Integrating Zinc-Tech galvanizing equipment into existing tube-making facilities allows for the establishment of a continuous ILG steel tube manufacturing facility. This high degree of adaptability, which allows for the maximization of existing equipment and an upgrade to a line that produces higher-value products, is a great strength and a key feature of our ILG.