Long material horizontal hot plating equipment and hot plating method
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A hot-dip, horizontal technique
Active Publication Date: 2018-06-29
TIANJIN GONGDA GALVANIZING EQUIP CO LTD
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Therefore, the size of the zinc pot is relatively large, resulting in a large zinc capacity and high energy consumption
In addition, the pretreatment also adopts the degreasing-pickling process, which has serious pollution
The pre-galvanized workpiece is also immersed in the zinc pot in a cold state, and is heated to the galvanizing process temperature by the zinc liquid, which takes a long time, so the production efficiency is low
[0003] In summary, the current blowing and hot-dip plating process for long products has problems such as high pollution, low efficiency, high cost, and different processes for different products.
Method used
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Embodiment 1
[0033] Adopt the method of the present invention to implement the threaded steel of product diameter 14mm, material 20MnSi, tensile strength 455Mpa, hot-dip Galfan alloy, line speed 90 meters / minute, production capacity 50,000 tons / year. The coating weight is required to be 50g / m 2 , the intensity drop does not exceed 5%. Its technological process is:
[0034] go through figure 1 process and figure 2 The device is used to complete the hot-dip Galfan alloy process for rebar. The specific process parameters are as follows: preheating temperature 510°C, hot-dip Galfan temperature 465°C, hot-dip time 1.2 seconds, air knife pressure 0.3 kg. Parallel production of three implementation products was carried out, and product measurement results were obtained: the coating weights were 48 μm, 52 μm, and 54 μm, the average coating weight was 51.3 μm, the alloy consumption per ton of product was 1.8 kg, and the tensile strength did not change.
Embodiment 2
[0036] Adopt the method of the present invention to implement the angle steel hot-dip galvanizing of product 30*30*3, line speed 120 m / min, annual output 70,000 tons, material Q345, strength 450Mpa requires zinc content 140g / m 2 , that is, 20μm thick, the strength drops within 5%. Its technological process is:
[0037] go through figure 1 process and figure 2 The device completes the hot-dip galvanizing process of angle steel. The specific process parameters are as follows: preheating temperature 550°C, hot-dip galvanizing temperature 455°C, hot-dip galvanizing time 1.0 second, air knife pressure 0.2 kg. Three products were produced in parallel, and the product measurement results were obtained: the coating weights were 18μm, 19μm, and 24μm, the average coating weight was 20.3μm, and the zinc content was 142.3g / m 2 , The zinc consumption per ton of product is 4.4 kg, and the tensile strength has not changed.
[0038] What is not mentioned in the present invention is appl...
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Abstract
The invention relates to long material horizontal hot plating equipment and a hot plating method. The hot plating equipment comprises a horizontal overflow hot plating device; the horizontal overflowhot plating device comprises a high-temperature resisting pipe, a high-frequency power supply, a main zinc pot, an overflow zinc pot and a protective gas source; the main zinc pot holds a hot platingmaterial; the upper parts of the main zinc pot and the overflow hot plating zinc pot are both sealed; a branch pipe for introducing a protective atmosphere is arranged at the middle part of the high-temperature resisting pipe; a high-frequency induction coil sleeves the front part of the high-temperature resisting pipe, and is connected with a high-frequency induction power supply; the tail end ofthe high-temperature resisting pipe is tightly connected with a workpiece inlet of the overflow zinc pot; a temperature measuring gauge is arranged near the tail end of the high-temperature resistingpipe; the overflow zinc pot is positioned above the main zinc pot; long material workpieces transversely penetrate through the overflow zinc pot; a lifting pump is arranged on the overflow zinc pot;and an overflow port is arranged above the overflow zinc pot. The equipment can provide a closed protective gas system to long materials, and finishes continuous hot plating process for the long materials.
Description
technical field [0001] The invention relates to the hot-dip technology in the metallurgical industry, in particular to a long product horizontal hot-dip equipment and a hot-dip method. Background technique [0002] In the prior art, the hot-dip galvanizing of long products adopts the process of solvent blowing plating method: degreasing—washing—pickling—washing—helping plating—drying—hot dipping—lifting the workpiece to the roller table for wiping with an air knife—water cooling—passivation— finished product. The so-called blow-plating refers to the long products that have been pre-treated, dipped in the plating flux, dried, and rolled down one by one into the zinc pot by the conveyor frame, and then lifted by the lifting device for air knife blowing to complete the hot-plating process. The zinc pot used in this process is the same as the usual batch hot-dip galvanizing pot. The size of the zinc pot depends on two factors: the size of the workpiece and the heat capacity of ...
Claims
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