抄録
Galvanizing makes the surface of the steel products to prevent the corrosion on the steel surface, and to endure the long-term use of steel products. Generally, in galvanizing process, the steel product is dipped into the molten zinc with about 440 to 470℃ then zinc coating with about 50 to 150 μm is formed on the surface of the steel material to achieve long-term corrosion protection.
Recently, zinc coating steel structure is increasing in size therefore the size of molten zinc galvanizing bath also becomes larger and larger.
In this report, some unstable fracture examples of new galvanizing bath in first start-up operation are introduced and preventive measures against its unstable fracture are discussed. In addition, an unstable fracture example of galvanizing bath in normal operation due to earthquake is showed and also its unstable fracture prevention is discussed.
