Rolling technique of lead treated steel
A free-cutting steel and process technology, applied in metal rolling, manufacturing tools, metal rolling, etc., can solve indicators such as head blooming, increase the probability of stacking steel accidents, the yield of lead-containing free-cutting steel, and economic benefits drop and other issues
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Embodiment 1
[0018] In this embodiment, a square billet with a length of Φ6.5mm, a length of 10-12m, and a billet size of 150mm*150mm is rolled, and a rolling mill is used for rolling. The rolling mill is divided into a rough rolling area, an intermediate rolling area, a pre-finishing rolling area, and a finishing mill. area. There are 8 shifts in the rough rolling area, which are horizontal light-duty rolling mills, numbered 0#~7#; there are 4 shifts in the middle rolling area, which are horizontal light-duty rolling mills, numbered 8#~11#; the pre-finishing rolling area The area of the finishing mill and the finishing mill is a horizontal-vertical alternating rolling mill, with a total of 14 shifts, and the pre-finishing rolling area is numbered 12#~15#. The lead-containing free-cutting steel enters the rolling process after the heating process, and the lead-containing free-cutting steel exits the heating furnace at a temperature of 1140-1190°C. The rolling process includes rough rolli...
Embodiment 2
[0033] In this embodiment, a square billet with a length of Φ8mm, a length of 10-12m, and a billet size of 150mm*150mm is rolled, and a rolling mill is used for rolling. The rolling process includes a rough rolling process, an intermediate rolling process, a pre-finishing rolling process, and a finishing rolling process. .
[0034] Before the rough rolling process, high-pressure water is used to descale the rolled piece. The pressure is 120Mpa, and the scale on the surface of the billet is completely broken. If the scale on the surface of the billet is not cleaned, use a spare rubber water pipe at the 0# rolling mill The surface is descaled with high-pressure water, and a spare rubber water pipe is arranged behind the 4# rolling mill to clean the scale, so that the scale on the surface of the billet is cleaned.
[0035] The rough rolling process is carried out in the rough rolling area of the rolling mill, that is, 0#~7# rolling mill, and the standard material type of 0#~7# ...
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