Expert Yogi
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| Finishing mill
The equipment configuration and control system of finishing mill is basically similar to that of traditional hot rolling mill.
(1) In order to reduce the rolling force and better control the shape of the strip, the last two mills work roll diameter configuration is small; and in order to increase the bite angle in the large reduction, the former mill work roll diameter configuration is larger.Painting Round Steel Bar
(2) in order to meet the needs of ferrite rolling, a fast cooling device has been installed in the former rolling mills.
(3) In order to solve the difficult problem of thin slab iron oxide scale removal, 40 MPa high pressure water descaling machine was installed in front of finishing mill. Besides, the descaling tube is also equipped after the first two rolling mills.Stainless Steel Pipe From Epai Hardware
(4) in order to roll thin strip, each rack is equipped with lubrication and rolling equipment.
Ferrite rolling technology
Ferrite rolling is rolling the strip to a certain thickness under austenite state, and then the strip can complete the transformation of gamma_a rapidly through strong cooling. In the state of full ferrite, the latter frame will roll the strip to the final thickness.
The purpose of using ferrite rolling technology is to avoid the sudden change of flow stress during the phase transformation from gamma to alpha. Especially when the strip is thin and the rolling speed is fast, the non-uniform deformation produced by the final finishing mill may lead to strip deviation and flatness defects. In addition, rolling in the presence of austenite and ferrite will lead to uneven mechanical properties of the strip and fluctuation of the final product thickness (the change of flow stress causes the change of rolling force, which makes the thickness control more difficult).
Ferrite rolling technology can produce directly applied hot-rolled or ultra-thin strips (instead of traditional cold-rolled annealed sheets), directly annealed, hot-galvanized (ultra-thin) hot-rolled strips after pickling, and cold-rolled and annealed hot-rolled soft strips. Ferrite rolled steel is generally low carbon and ultra-low carbon steel.Anti Corrosion Stainless Steel Square Bar 304 TISCO Cold Rolled Bar
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Technical characteristics of thin slab continuous casting and rolling
