JPS58163520A - Descaling method of hot rolling steel material - Google Patents

Abstract

PURPOSE:To execute descaling in a good state without causing a remarkable temperature drop of a steel material, by small energy, by stripping off a surface scale layer of the steel material with a brush roll in front of a rolling roll, and subsequently, removing the scale layer by jetting a fluid. CONSTITUTION:As for a steel material S, in front of a rolling mill 1, first of all, the surface is polished and cleaned by brush rolls 2, 2, and the surface acale layer is crushed or stripped off. Subsequently, a fluid is jetted to said surface scale layer by fluid purge headers 3, 3, and the scale layer is removed almost completely. A peripheral speed of the brush rolls 2, 2 is regulated to 700- 1,000m/min, and injection pressure is regulated to 20-60kg/cm<2>.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention applies to a method for descaling heat-related and pressed steel materials. The primary scale that appears when the steel material is heated in a heating furnace and the secondary scale that occurs during rolling This light accelerates roll O wear and causes 9)% product table INK scale defects, reducing product value. 4- Steel #0IIIil transferred in the previous round or finish rolling
110 to l@ via K high pressure descaling header
・Spray high-pressure jet water of 'Kg/al craftsmanship, steel material table I
A method of blowing off the IO scale is used.However, in this way, the conventional method of removing the 9 scale adhering to the steel material using high-pressure O jet water is used to increase the water pressure by operating a pump. With a lot of power.

The problem is that a large amount of water is required for injection, which naturally causes the surface temperature of the steel material to decrease. However, there is a problem with this large heating furnace (KsI), which is heated to the extent that the temperature decreases.・Moreover, spraying high-pressure water alone is sufficient to completely scatter and remove the scale that adheres to the surface of the steel material 11, which is sufficient as a means to reliably prevent scale defects in the product 11m. For this reason, a method has recently been proposed in which abrasive material is placed in 1004/a/or less Oa pressure water for descaling. Steel material is 110G-1
The temperature is as high as 800 degrees Celsius, and it is very hot! When high-pressure water with a very small R-type resistance (Vh9 (8 to 1 SKq/ml) and abrasive material included in the fin) was injected, the abrasive material bit into the #11 steel surface.

There is a problem that it causes a decrease in crystal yield, and there is a problem in terms of equipment and processing cost, which requires a large amount of electricity and water to obtain 1ltlk#oI & high pressure during lamination. The present invention takes advantage of the drawbacks of the conventional method and uses %O to perform accurate descaling without the disadvantages that cause problems in the conventional method. ζYoga and 11ゐI am trying to provide a method.

This rolling invention is done by rolling roll screen.

First, the surface of the working steel material is polished with a brush roll to remove the scale layer on the surface of the steel material or to form a layer of scale on the surface of the steel material.

The basic feature is that the scale mentioned above is removed by injecting fluid onto the steel material 1111. In this way, the cleaning by the brush 4-〃 and the assembly by the fluid injection are combined. By.

It appears that effective descaling is possible without the need for injection of high-pressure fluid. The basic feature of the present invention is to crush the cyscale layer by rolling the steel material with a seal having an uneven surface prior to the abrasive treatment using the upper i-brush and -2. This is the best thing to do,
It is possible to obtain a higher descaling effect.

Below, the method of the present invention will be explained with reference to 15m. ・The first @ shows the basic configuration of the method of the present invention, (1) is a rolling mill, (2) and <2) are brush rolls, (3) and 0
) is a fluid purge header, (4) is a table roll, and (4) is a pinch roll. In the rolling mill (1), the steel ($01) is first polished by a push roll (2) to crush or peel off the surface scale layer. The scale layer is sprayed with anti-relay fluid by headers (6) and (3), and the scale layer is almost completely removed. Pushirol is used, for example, stainless steel with a wire diameter of O, S ~ 1. Om
The a II z diagram in which a brush with a l s length of about 8190 to 11 sOsm is used shows good results when the relationship between the scale ratio of the lifting platform and the brush roll circumferential speed, which was descaled only by brush cooling, was investigated. However, if the circumferential speed of the push roll is large, the tax scale rate will improve.

Circumferential speed Ganabu 1000 mplnf descaling rate is highest (
80ts) I/c], it can be seen that there is no change in the descaling effect even if the peripheral speed is increased further. Therefore, it is most preferable for the peripheral speed of the brush rail to be 1000 mpns.

As the fluid, water, gas, stinium, etc. can be used as appropriate, and the injection pressure is adjusted according to the circumferential speed of the brush rule, the type of fluid, etc.

For example, when the injection fluid is water, the injection pressure is zo4/a/ or more, and specifically, the pressure is 700
It is preferable to set the pressure to ~1000m'1lP111 to ~gob/j. Section 31a shows the results of investigating the relationship between the descaling rate and the injection pressure when water is used as the injection fluid and the injection pressure is round. ) has a brush roll peripheral speed of 2001np! According to this k, when the circumferential speed of the brush rail is 200 mpm, the descaling rate of t1 is 100 mM at a pressure of -8O1'w/aF or more, and t is 1000mM. Case 20 (a descaling rate of fitt'xoo- is obtained at -breath pressure) - From this, in the case of water, a sufficient descaling effect can be obtained at a pressure of 20 to 60 K41014 degrees. If the fluid is gas, it is 720114/<- or more, and if it is steam, it is 1 Ov.
The relationship between the descaling rate and the injection pressure using gas (air) as the e-41+1 ore injection fluid, which is preferably at a pressure of -41+1 ore, and the relationship between the descaling rate and the injection pressure using steam (200°C) as the injection fluid These are the results of investigating the relationship between descaling rate and injection pressure when the brush rail circumferential speed is 10100O! Xi
According to this k, for gas it is 20 (more than 9, and for large steam it is 1).
It can be seen that a descaling rate of approximately 10 G- is obtained at 0 Kg/a1 or more.

FIG. 6 shows one implementation situation of the present invention.

The descaling effect can be improved by repeating the cleaning by brush rolls (2) and (2) and the fluid injection several times at the front of the rolling mill (1). A particularly preferred embodiment is as follows.

Of the multiple brush rolls in the twin direction, the wire diameter of the brush is made extremely small on the image side after the line.This allows effective descaling.For example, the brush in the stripe 6 figure The wire diameter of the roll is 1.0 to Q, 8 wm for the push roll (2 m) and (2 m).
l, 0.7 to G with brush roll (cloth) and (2b),
4■ da, 0.3 with brush roll (2c) and (2c)
■Keep your voice low.

Each brush roll performs surface cleaning.Furthermore, the fluid jetting after cleaning by each brush roll is 10~a o 111/
A pressure of a/s degrees (for water) is used.

Figures 7g and 8 show other embodiments of the present invention.
2) Fluid jetting is performed not only at the rear w but also at the front, and the one shown in Fig. 8 is designed to jet fluid at two places on the rear face of the push roll (2) and (2). This is what I did. In this way, by injecting the fluid in front of the brush rolls (2) and (2) or at the smog point, it is possible to effectively remove scale at a relatively low pressure. This shows another basic configuration of the present invention, and the scale of the steel table is 4! This is a suitable descaling method when the scale layer is thick. In other words, prior to the surface polishing with the brush roll mentioned above, the steel material is rolled with a roll having unevenness as shown in Table 11 to crush the scale layer. (6) and (6) are rolls with uneven surfaces, and the surface scale layer of steel material (8) is formed by such four rolls (6) and (6).
6) After being crushed, the seal is cleaned by pushers (2) and (2), and then fluid is injected to effectively descale the seal (6), In the case of knurled four-ru, melded erol, etc., the surface m may be formed into an uneven shape and an appropriate p-
can be adopted.

It is preferable that the injection pressure of the fluid be at least *oh/m1. ) The results show the results of examining the relationship between the injection pressure and 0@.
/A descaling rate of 1 GG% was obtained),
It can be seen that even higher descaling effects can be obtained by cleaning both sides of the surface with a brush roller, fluid injection, and O contribution.As described above, in the present invention, the pressure of fluid injection on the rear surface of the roller o It is possible to obtain a good descaling effect while keeping it below Kg/aj, thereby reducing the fluid volume and fluid injection KJ@? According to the method of the present invention described above, it is possible to effectively remove the scale layer on the surface of the steel material. In addition, this descaling effect can be achieved with a small amount of energy and without causing a decrease in product yield during a significant temperature drop in the steel material. 11iOII A simple explanation 1111 shows the basic implementation status of the present invention.
There is wAai"e. The second @ shows the relationship between the circumferential speed of the push roll used for military launches and the descaling rate of the push roll alone. ・11m1i1 uses water as the injection fluid. Pigeon house O injection pressure, descaling rate, and O relationship.No. 411 shows the O injection pressure, descaling rate, and O relationship when gas is used as the injection fluid.Sekibe S diagram shows the relationship between O injection pressure and descaling rate. This figure shows the relationship between the O injection pressure and the descaling rate when using steam. Figure 1 is an explanatory diagram showing the implementation status of the present invention. Figure 1 also shows another implementation status of the present invention. FIG. 8 is an explanatory diagram showing another implementation situation of the present invention. FIG. 9 is an explanatory diagram showing another basic implementation situation of the invention.

In 1), (2) (2m) (!b) (2a)
is a brush roll, and (3) is a fluid purge header.

Patent applicant: Nippon Koukan Co., Ltd. Inventor: Yodo Naemura
Great painting, butsu-ma
Shiroishi, @same
Fumi Nakamura Human
Shun Mori Between meals Yamazaki l 2 Same early
Tsutomu Kawa 100 Figure 2 4L! J';J,,4! 'tMUt (kg/crt?') 3rd N book 4jtfAO (kg/cm2) Figure 5 Steam v7t, Jl\A force (kg/crrf') 7th
Figure 8 Procedural Amendment (1=1) Registration) December 8th, 1981 Former Lady Patent Officer Shima 1) Mr. Haruki, (Patent RR Examiner
): Relationship with the case of the person making the amendment Patent Applicant (41!) Nippon Steel Tube Co., Ltd. 4 Agent 5 Amendment Order H Attached to Amendment Order Contents A Specification of the Application, Page 9, 17 Line IKr is. ” and then add the following.

However, if a plurality of brush rolls are provided in the line direction as described above, and the diameter of the brush roll O is made as small as possible after the line, a certain degree of descaling effect can be achieved even without fluid injection in each brush roll IIM. You can expect it. ”

Claims (7)

[Claims] (1) On the 0* side of the rolling mill, the surface of the copper material is polished with a brush roll to crush or peel off the scale layer on the surface of the steel material,
A method for descaling hot rolled steel #O, which is characterized in that a 1iK fluid is then injected onto the surface of the steel material to remove scale from the surface of the steel material. (2) The hot rolled steel O-descaling method according to claim II (1), characterized in that a gas is used as the fluid. (3) Claims characterized in that steam is used as the fluid ■(1) Descaling method for hot rolled steel materials (4) The surface cleaning with a brush roll and the fluid O injection are repeated more than 100 times, and the back surface of the line is polished with a small diameter press roll. Patent request OIt! The method for descaling hot rolled steel according to II(1). (5) A method for decooling a hot rolled steel material according to claim 5(1), characterized in that a fluid is injected onto the surface of the steel material with a brush roll. (6) Patent claim O, characterized in that fluid is injected onto the surface of the steel material at two locations on the rear surface of the brush roll ■ (1) @0 Descaling method for hot rolled steel material @ (7) Set the circumferential speed of the push roll to 70.~xooo, and the injection pressure of 11 bodies! ! O~s @ 4/6/ Patent claim OII ■(1) go descaling method characterized by: (Im) On the front surface of the rolling hole, the steel material is rolled into an uneven surface.
By rolling with a roll, the scale layer of the steel surface (■) is crushed. 1.Then, the scale layer is crushed and peeled off by grinding the steel surface (2) with a brush roll, and the scale layer is crushed and peeled off.
There is also a method for descaling hot-rolled steel materials by injecting one IIKI to remove scale on the surface of the steel material.