Key words: hot dip galvanized seamless steel pipe
From the past experiment and production practice, it is necessary to control the temperature of hot dip galvanizing bath at 450 - 460 C. When the temperature is high, it will increase the heat consumption, shorten the service life of steel zinc pot, accelerate the formation of zinc slag and zinc ash, and affect the quality of the plastic layer of galvanized silkworm cocoon. When the temperature is low, the galvanizing ability of seamless steel tube will be affected, and the zinc layer becomes thicker and uneven due to the decrease of the fluidity of zinc solution.


Experienced hot-dip galvanizing workers control the immersion time by studying the reaction of hot-dip galvanizing: "Put seamless steel tube in the immersion bath until the ubiquitous phenomenon stops, and immediately upgrade it." The thickness of zinc layer required for use space was obtained. "


Manufacturers of seamless steel tubes have shown that the thickness of zinc-iron alloy layer under pure zinc layer is related to zinc dipping time, and the thickness of pure zinc layer is related to the recommended speed of seamless steel tubes. Some galvanizing processes in high-voltage tower, metal structure plant, steel pipe galvanizing plant and automotive parts galvanizing plant for many years are usually 30 to 60 seconds.