Anneal technique for producing SPCC steel grade with zincing wire annealing oven
An annealing process, an annealing furnace technology, applied in furnaces, heat treatment furnaces, manufacturing tools, etc., can solve problems such as galvanizing line shutdown or semi-stop production, continuous annealing furnace complex structure, substrate surface oxidation, etc., to reduce depreciation losses, eliminate The effect of increasing the production cycle and elongation rate
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[0028] Example 1: Variety SPCC, specification 1.0*1250mm, process: the operating speed of the production line is 53mpmin, after the strip is cleaned, the strip enters the furnace, and the strip enters the direct combustion section after being preheated to 170°C in the preheating section It is heated to 624℃ by an open flame, and the strip steel is heated to 740℃ by the radiant tube heating section. The strip steel in the soaking section of the radiant tube is insulated at 720℃ by the electric radiant tube. ℃. Protective gas: nitrogen flow 701m 3 / hr, pressure 4.3bar, oxygen content 6.79ppm; hydrogen flow rate 65.6m 3 / hr, the pressure is 2.7bar, the percentage is 7.80%; the gas pressure is 83.1mdar; the dew point of the direct combustion section: -39.81℃, the dew point of the first zone of the spray cooling section: -60℃.
Example Embodiment
[0029] Example 2: Variety SPCC, specification 1.5*1250mm, process: the operating speed of the production line is 38mpmin, after the strip is cleaned, the strip enters the furnace, and the strip enters the direct combustion section after being preheated to 140°C in the preheating section The strip is heated to 610°C by an open flame, and the strip is heated to 764°C by the radiant tube heating section. The strip in the soaking section of the radiant tube is kept at 690°C, and the strip is cooled to 230°C through the spray cooling section, and the discharge temperature is 180°C. Protective gas: nitrogen flow 500m 3 / hr, pressure 4.1bar, oxygen content 6.93ppm; hydrogen flow rate 65.5m 3 / hr, the pressure is 2.4bar, the percentage is 7.92%; the gas pressure is 96.5mdar; the dew point of the direct combustion section: -40℃, the dew point of the first zone of the spray cooling section: -67℃.
Example Embodiment
[0030] Example 3: Variety SPCC, specification 0.5*1250mm, process: the operating speed of the production line is 76mpmin, after the strip is cleaned, the strip enters the furnace, and the strip enters the direct combustion section after being preheated to 180°C in the preheating section The strip is heated to 630°C by an open flame, and the strip is heated to 790°C through the radiant tube heating section, the strip steel in the soaking section of the radiant tube is kept at 730°C, and the strip steel passing through the spray cooling section is cooled to 190°C and the discharge temperature is 160°C. Protective gas: nitrogen flow 701m 3 / hr, pressure 1.3bar, oxygen content 7ppm; hydrogen flow rate 90m 3 / hr, the pressure is 2.7bar, the percentage is 8.03%; the gas pressure is 83.1mdar; the dew point of the direct combustion section: -40℃, the dew point of the first zone of the spray cooling section: -69℃.
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