JPS62173002A - Manufacture of wire rod steel and round bar steel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a method and an apparatus for carrying out a method for economically producing steel wire rods and round bars in a continuous line. In this continuous line, the raw material is rough rolled in a high reduction reducer, followed by intermediate rolling and finishing rolling in a single continuous line.

b. Prior Art It is known to upstream continuous wire rod and round bar lines with high-pressure scale reducers, such as, for example, planetary ruled mills. The advantage of such a line is that it is possible to process significantly larger coarse billets than is possible in conventional continuous lines at the minimum allowable drawing speed.

In conventional continuous line or multiple cascade equipment, the rolled material may first be rough rolled in a single line, then longitudinally cut into two strands, and then finish rolled in the two strands. It is publicly known.

C3 Problems to be Solved by the Invention Starting from the recognition that increasing the rough billet cross-section provides metallurgical and continuous casting technology advantages, the present invention aims to improve metallurgy by using a high reduction reducer. and to provide a method and apparatus for carrying out a method for economically producing wire rod and round bar steel, which offers the advantages of continuous casting technology and which allows for relatively large input weights with a winding weight after longitudinal cutting. I made it a challenge.

d. Means for Solving the Problem According to the present invention, such a problem is solved by vertically cutting the rolled material before finishing rolling. The apparatus for carrying out this method is such that the final device of the continuous intermediate line is followed by a known device for longitudinally cutting the rolled material into at least two strands of rolled material, and a finishing line is followed for each strand of rolled material. ing.

Larger rough billets can be produced by immersion casting. A large billet size also causes spherical coagulation. That is, intermediate segregation and core porosity are suppressed, favoring micro segregation.

This structure is better suited for slitting than the small billet size structures produced by open casting, which are cut during slitting and are porous and have significant intermediate segregation.

Since the coarse billet becomes larger and therefore the cracker/throat weight becomes larger, billet loading frequency (failure) and lost time (rest) are reduced. The finish profile accuracy is not adversely affected in this case, since the single-line finish rolling method can be maintained.

By enlarging the rough billet, and in this case round size, it is possible to cast a starting product of high quality, which does not require intermediate inspection and can be heat treated using casting heat. is also possible.

Preferably, the finishing lines are arranged in a professional manner.

For example, use known wire blocks and divide them into 1 piece each.
Assign to one rolled material strand.

e. Example Next, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 designates a lifting beam heating furnace into which billets arriving from a continuous casting apparatus are introduced. Cooling treatment of billets is also possible.

After coming out of the descaler 2, the billet is carried into a high-pressure reducer (reducing mill) 3, where the billet is stretched to an extremely high degree by this high-reduction reducer 3.
The results are narrowed down as in the embodiment described below. Reference numeral 4 designates a rotary shear, and reference numeral 5 designates a continuous-line rolling mill for intermediate rolling of the rolled material with horizontal-vertical devices arranged in direct longitudinal connection. At 6 there is shown a device for transversely cutting the rolled material into two rolling strands, which are rolled into a finished profile at wire blocks 7 and 8. The wire blocks 7 and 8 can optionally be provided with a pretreatment rolling device 9.

Next, one embodiment will be described. Diameter 250 tm, length 12
A round billet weighing 4.475 kg is heated to rolling temperature in a lifting beam heating furnace 1, knocked out, and descaled by a reducer 3 with a high degree of reduction before the first hole forming process. The lifting beam furnace 1 is designed for heat and cooling treatments.

The billet is modified from a diameter of 25 On to a diameter of 112 mm in the reducer 3 with a high degree of reduction. Unnecessary portions of the billet transported at a speed of 0.52 m/s are removed using the rotary shear 4 to avoid obstacles in hole forming in the first device of the downstream continuous line 5. This operating sequence is repeated for the same reasons after the rolled material longitudinal cutting device 6 and before the finishing block 7.8.

In the 7th unit of the continuous line, the steel bar drawn from a diameter of 42vA is machined into holes, and this bar is divided into two bars in the 10th unit by slit-roll method, and then conveyed to the finishing line where they are further processed in a single line. Rolled.

In front of the eleventh and twelfth devices and the finishing block, a loop-forming machine is provided, which is capable of rolling without tension in order to improve the cross-over of the rolled material.

The eleventh and twelfth devices are configured in a horizontal-vertical structure to avoid damage to the surface of the rolled material due to twisting.

The carrying cross section with a diameter of 18.5+n is 90 m with finished blocks.
/s to a finished cross-section of diameter 61, cooled in a subsequent device, coiled and finally rolled to a finished cross-section of diameter 61/s.
It is collected into a wire winding with a weight of 0 kg.

This mill configuration also makes it possible to produce high-quality steel without using the slit-roll process in the same size range, but with a diameter of 5.51 mm or more from a hole type with a billet length of 2. can.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of a continuous rolling apparatus according to the present invention. 1... Lifting beam type heating furnace, 2... Descaler,
3...Reducer, 4...Rotating shear, 5...Continuous line rolling mill, 6...Rolling longitudinal cutting device, 7.8...Wire rod block, 9...Pretreatment rolling Device.

Claims (1)

[Claims] 1. A method for producing steel wire rods and round bars on a continuous line in which unprocessed material is roughly rolled using a reducer with a high degree of reduction, and then intermediate rolling and finish rolling are performed on a single continuous line. A method for producing steel wire and round bars, characterized in that the rolled material is longitudinally cut in a manner known per se before finishing rolling. 2. The finishing device 6 of the continuous intermediate line 5 is followed by a known device for longitudinally cutting the rolled material into at least two strands of rolled material, and each strand of rolled material is assigned a finishing line 7, 8. An apparatus for carrying out the method for manufacturing wire rod steel and round steel bar according to claim 1. 3. The apparatus according to claim 2, characterized in that the finishing lines are arranged in blocks.