At present, there are two common methods for producing galvanized square tubes, which are hot-dip galvanized and cold galvanized square tubes. What are the differences between the two processes? Today, the small editor of the galvanized pipe manufacturer in Ji'nan brings us together to understand the reason why the galvanized pipe produces bubbles.
Because the gas in the melt precipitates with bubbles, there are three conditions: first, the dissolved gas is in a supersaturation state; the two is the sum of the partial pressure of various gases in the bubble is greater than the external pressure acting on the bubble, and the three is the bubble core larger than the critical value. Under the actual casting conditions, there is always a large number of nonmetallic inclusions, binding bodies and unescaped bubbles in the melt, so the non spontaneous bubble nuclei in the melt are easy to form.
In addition, Ji'nan galvanized pipe through the melt mixing, the hydrogen content was lower than the equilibrium concentration, but the gas concentration redistribution in the solidification process of the node, causing local hydrogen content in the liquid crystal front supersaturation, and galvanized pipe forming bubbles created favorable conditions. When the hydrogen partial pressure in the crystalline front liquid increases to greater than the external pressure, it may form a bubble.
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