Large-specification free-cutting steel rolling method
A free-cutting steel, large-scale technology, applied in the field of steel rolling, to achieve the effects of excellent surface, smooth rolling process and good cutting performance
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Embodiment 1
[0024] The rolling method of large-scale free-cutting steel with a diameter of 16mm, the parameters of the rolling process and control technology are as follows:
[0025] (1) The temperature of the preheating section of the heating furnace is 950°C, the temperature of the heating section is 1060°C, the temperature of the soaking section is 1200°C, and the rolling start temperature is 1110°C;
[0026] (2) The water pressure of high pressure water descaling is 15MPa;
[0027] (3) The cutting lengths of 2# and 3# flying shears are 250mm and 600mm respectively;
[0028] (4) The inlet temperature of the finishing mill is 980°C;
[0029] (5) The coil collection temperature is 870°C;
[0030] (6) The final rolling speed is 12m / s;
[0031] (7) The six fans on the cooling line are all turned on, the air volume is 100%, and the cooling rate is 1.5k / s.
[0032] The 16mm wire rod produced according to the above process has a good surface, no defects such as ears, folds, and scars, and...
Embodiment 2
[0034] The rolling method of large-scale free-cutting steel with a diameter of 20mm, the parameters of the rolling process and control technology are as follows:
[0035] (1) The temperature of the preheating section of the heating furnace is 980°C, the temperature of the heating section is 1050°C, the temperature of the soaking section is 1180°C, and the rolling start temperature is 1090°C;
[0036] (2) The water pressure of high pressure water descaling is 12MPa;
[0037] (3) The cutting lengths of 2# and 3# flying shears are 300mm and 630mm respectively;
[0038] (4) The inlet temperature of the finishing mill is 950°C;
[0039] (5) Roll collection temperature is 850°C;
[0040] (6) The final rolling speed is 11.5m / s;
[0041] (7) All six fans on the stack cooling line are turned on, the air volume is 100%, and the cooling rate is 1.0k / s.
[0042] According to the above process, the surface of the 20mm wire rod is excellent, without defects such as ears, folds, scars, e...
Embodiment 3
[0044] The rolling method of large-scale free-cutting steel with a diameter of 22mm, the parameters of the rolling process and control technology are as follows:
[0045] (1) The temperature in the preheating section of the heating furnace is 1000°C, the temperature in the heating section is 1045°C, the temperature in the soaking section is 1190°C, and the rolling start temperature is 1100°C;
[0046] (2) The water pressure of high pressure water descaling is 10MPa;
[0047] (3) The cutting lengths of 2# and 3# flying shears are 285mm and 680mm respectively;
[0048] (4) The inlet temperature of the finishing mill is 1000°C;
[0049] (5) Roll collection temperature is 900°C;
[0050] (6) The final rolling speed is 9m / s;
[0051] (7) The six fans on the cooling line are all turned on, the air volume is 100%, and the cooling rate is 0.8k / s.
[0052] The 22mm wire rod produced according to the above process has a good surface, no defects such as ears, folds, and scars, and no...
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