Manufacturing method of hot-rolled steel sheet
A manufacturing method and technology of hot-rolled steel plates, applied in metal rolling, manufacturing tools, metal rolling, etc., can solve the problems of reduced rolling speed, reduced rolling efficiency, unstable rolling state, etc., and achieve improved jointability , Stable rolling, and the effect of preventing fracture
Inactive Publication Date: 2017-05-10
JFE STEEL CORP
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AI Technical Summary
Problems solved by technology
Especially at the front and rear ends where tension is not applied, it is easy to form an unstable rolled state (rolled state), and the thinner the final plate thickness, the easier it is to be affected
The thinner the final plate thickness, the easier it is for the flying phenomenon (floating phenomenon caused by air resistance) at the front end to occur on the cooling table after finish rolling, and the threading becomes unstable, so it is necessary to reduce the rolling speed (rolling speed), resulting in a reduction in rolling efficiency
Method used
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Embodiment 1
[0098] As an example of the present invention, a full continuous hot rolling method is used to manufacture hot-rolled steel sheets.
[0099] The target steel plate is a high-tensile steel plate with a tensile strength of 590MPa at room temperature. Both the previous material and the subsequent material are rolled from a slab with a thickness of 260mm and a width of 1300mm to a thickness of 28mm and a width of 1000mm through a rough rolling process. of thin slabs. In addition, the heating temperature of the slab was set so that the temperature of the thin slab before joining by upset forging would be about 1050 degreeC.
[0100]In the example of the present invention, the preceding material and the succeeding material were rolled from a slab into a thin slab, and the preceding thin slab and the succeeding thin slab were joined as follows.
[0101] For the preceding material, use Figure 4 In the shown fixed-width press die (mold inclination angle 12°), the pre-forming length ...
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Abstract
The purpose of the present invention is to reduce or inhibit plate breakage in completely continuous hot rolling by improving joining properties of edge peripheries of sheet-bar joint portions in a plate width direction, without any accompanying increase in the size of a joining device. When using completely continuous hot rolling to produce a hot-rolled steel sheet, an end shape, in a plate width direction, of a tail end of a preceding sheet bar and / or a tip end of a succeeding sheet bar is formed in a rough rolling step so as to be a tapered shape or a curved shape, and a shear cutter is subsequently used to shear the tail end of the preceding sheet bar and the tip end of the succeeding sheet bar such that at least a portion of the tapered shape and / or the curved shaped is retained.
Description
technical field [0001] The present invention relates to a method capable of preventing sheet fracture (fracture) by improving the joining characteristic around the ends of sheet bar joints in the sheet width direction in endless continuous hot rolling. Manufacturing method of hot-rolled steel sheet. Background technique [0002] In the manufacturing process of hot-rolled steel sheets, the thinner the finishing sheet thickness is, the easier it is to cause crushing (crash) at the front end and necking or pinching (pincher) at the tail end during finish rolling. and other failures. It takes time to reassemble the rolls for recovery and remove the broken material, and these failures cause a significant decrease in the efficiency of the production line. [0003] The main cause of this kind of failure is that in the plate rolling, due to the abnormal sound of each part of the rolling mill, the serious asymmetry property such as the wear of the roll, the asymmetrical temperature...
Claims
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IPC IPC(8): B21B1/26B21B15/00B21C51/00
CPCB21B15/0007B21B15/0085B21B2015/0014B21C51/00
Inventor 三宅胜日野善道森和哉
Owner JFE STEEL CORP