JPS61212405A - Hot rolling method for carbon-steel wire rod - Google Patents

Abstract

PURPOSE:To obtain a hot-rolled carbon-steel wire rod having smooth surface and excellent mechanical descaling properties by spraying high-pressure water on a wire rod, just after passing through plural stands, at the position preceding by a few passes from finish rolling. CONSTITUTION:A carbon-steel wire rod 2 is hot rolled by using a rolling line constituted by arranging alternately rolling rolls having oval calibers and rolling rolls having round calibers. At that time, when the wire rod 2, rolled into a <=10mm rod diameter, is rolled by the rolling rolls 1 having oval calibers at the position preceding by five or six passes from finish rolling rolls. High- pressure water is sprayed on the surface of wire rod 2 from the clearance of rolling rolls 1 to remove scales, being on the verge of stripping from the surface of the rolled wire rod 2. In this way, a carbon-steel wire having excellent mechanical descaling properties in descaling to be performed prior to cold wire-drawing.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for hot rolling a carbon steel wire rod, and in particular a method for obtaining a hot rolled wire rod with better mechanical descaling properties than conventional ones before cold wire drawing. Regarding.

[Conventional method]

When a steel ingot is heated and rolled into a wire rod, scale on the surface is crushed before rough rolling, removed by spraying pressure water, and then rolled through a row of rolling rolls to a desired wire diameter. This hot-rolled wire rod is roughly cold-drawn and further processed into a wire rod with a smaller diameter. Prior to the cold-drawing, scale is removed from the surface of the hot-rolled wire rod. As a method for removing scale, a mechanical scale removal method is becoming popular in place of the conventional pickling method.

Although it is difficult to completely remove scale using only mechanical scale removal methods, the smoother the surface of the hot rolled wire rod is, the better the ability to remove the scale. Good results can be obtained in terms of wear, wire surface finish, etc.

[Problem that the invention seeks to solve]

In view of the above circumstances, the present invention has a smoother surface than the conventional one,
Hot-rolled carbon fl with excellent mechanical descaling properties
An object of the present invention is to provide a hot rolling method capable of obtaining an i-wire.

[Means for solving problems]

In order to achieve the above object, the present invention provides a rolling roll row in which rolling rolls having oval caliber grooves and rolling rolls having 9 caliber 2 (9 caliber grooves) are arranged alternately. The wire rod rolled to a wire diameter of 10III11 or less before the bus is rolled at a plurality of consecutive stands, and the wire rod is rolled while being sprayed with high-pressure water immediately after passing through the rolls.

(Function) In the method of the present invention, secondary scale generated during rolling on the surface of a wire rod being hot rolled and residual scale on the surface of a heated steel ingot are deformed by rolling when the wire rod is rolled down with rolling rolls. The scale that is about to peel off from the surface is separated from the surface using high-pressure water, and the scale is bitten into the surface by the subsequent rolls to prevent the wire surface from becoming rough in the direction perpendicular to the axial direction of the final rolling roll. This is what I did.

However, high-pressure water spraying is not effective if the position is 6 baths before the finishing roll.

In particular, the present invention uses a plurality of consecutive stands that further roll a wire rod that has been rolled to a wire diameter of 108 or less 5 to 6 busses before the finishing roll having a round caliber groove, into a wire rod immediately after passing through the rolls. By spraying aqua regia with a height of 100 peaks and removing the scale on the wire surface that is peeling off due to rolling, the grooves of the wire rod are finished with a finishing roll having a final round caliber groove. It was discovered that the roughness of the surface located between the rolls can be made as smooth as the roughness of the surface of the portion in contact with the grooves of the roll.

〔Example〕

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Weight %, MnO, 10 ~ ko, oo weight %, P O, 00
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A carbon-copper ingot having a composition of 5% by weight and the balance being Fe was rough-rolled after surface scale was removed by spraying with high-pressure water, and rolled with oval caliber grooves 5 baths before the finishing roll with 9 caliber grooves. When the wire diameter is rolled down from 91m to 11m with the rolls /, /, as shown in the first @, pipe 3 is passed through the gap between the rolling rolls /, /, and pipe 3 is applied to the surface of the wire! OJ19/? ) High-pressure water of I was sprayed to remove the scale that was about to peel off from the surface of the wire rod rolled down by the rolling rolls. After that, the wire rod is alternately used with finishing rolls with round caliber grooves and rolling rolls with oval caliber grooves! The wire was passed through a bus to form a wire rod with a circular cross section and a diameter of 5J ILIm.

The hot rolled wire rod produced by the method of the present invention has a surface condition located between the final rolls as shown in FIG. As shown in the figure, it became extremely smooth.

〔Effect of the invention〕

According to the method of the present invention, it is possible to obtain a hot rolled carbon steel wire rod with good mechanical descaling properties prior to cold wire drawing.

Brief explanation of the etiology Figure 1 is a perspective view showing the procedure for spraying high-pressure water onto a wire rod in the method of the present invention, and Figure 2 shows the final inter-roll surface roughness of the wire rod obtained by the method of the present invention. FIG. 3 is a diagram showing the final inter-roll surface roughness of the wire rod obtained by the conventional method.

l...Rolling roll, 2...Wire rod, 3...Pipe.

Figure 1

Claims (1)

[Claims] (1) In a row of rolling rolls in which rolling rolls with oval caliber grooves and rolling rolls with round caliber grooves are arranged alternately, the wire diameter is 10 mm or less 5 to 6 baths before the finishing roll with round caliber grooves. A method for hot rolling a carbon steel wire rod, which comprises rolling the wire rod while spraying high-pressure water on the wire rod passing through a plurality of successive rolling stands immediately after passing through the rolls.