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Will the properties of the steel change after galvanizing?
The hot-dip galvanizing process is carried out in the order of "degreasing, pickling, chemical treatment, hot dip galvanizing, cooling". During this period, the degreasing, chemical treatment and cooling process have no effect on the properties of steel, no problem occurs, the pickling process has no effect on the general steel grade, but for high-strength steel or quenched and tempered steel of 80kg/mm2 or more, in acid Hydrogen is more sensitive when washing, so you must be very careful. Despite this, the results of various experiments have not been clearly identified.
The galvanizing process has no effect on the properties of general steel grades, but the mechanical properties, yield point, tensile strength, elongation, impact strength and fatigue strength of high strength steels above 60 kg/mm2 will change somewhat. They are all within their standards, so the impact is small. Therefore, the hot dip galvanizing treatment of high-strength steel and quenched and tempered steel should be known to galvanizing manufacturers in advance.
Can hot-dip galvanized steel be twisted and processed?
The galvanized film consists of a pure zinc layer and an alloy layer. The elongation of the two coatings has certain constraints. If the constraint is beyond the harshness of the constraint, the coating will crack and peel.
The galvanized steel pipe for water pipes and the tortuous test of BS have rules. The 90° twist of the outer diameter of the pipe is used as the experimental basis. Although there are such standards, there are still twists and turns experiments with larger tortuous radius. The main influencing factors of coating peeling are the tortuous radius and angle; the smaller the radius, the easier it is to peel off.
The tortuous workability is also affected by the galvanizing conditions. If good tortuous workability is required, it is necessary to suppress the growth of the alloy layer and uniformly adhere the pure zinc layer. Therefore, the lower the galvanization temperature, the shorter the immersion time, and the rapid cooling after plating is necessary. However, the tortuous workability of galvanized products still has certain constraints. When it is necessary to do the harsh bending process, it is necessary to do well before plating. If it is done after plating, it should be fully communicated with the galvanizing factory beforehand.