JPS58110117A - Descaling method of steel material - Google Patents

Abstract

PURPOSE:To easily and perfectly perform descaling and to obtain a steel material having excellent surface properties, by spraying highly pressurized water or compressed air on the material while the material is deformed between rolling rolls. CONSTITUTION:Side descaling devices 8 are provided to both sides of a billet 2 between an upper roll 5 and a lower roll 6 of a rolling mill 3 to spray highly pressurized water or compressed air or both on the free surface of the billet 2 while the billet 2 bitten by the rolls 5 and 6 is defomred. Hereupon, since scales 4 are compressively strained to be kept in a cracked state, the scales 4 are satisfactorily removed. By this method, descaling is perfectly performed, and a billet having excellent surface properties is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for descaling steel materials, and more specifically, the present invention relates to a method for descaling steel materials. The method of compressive strain caused by biting into the roll is superior to the method of removing scale by injecting sieve-pressure water, high-pressure air, etc. into the cracked area when the scale breaks.

In Nekkan Press, the surface of the steel material heated in a heating furnace has the following properties:
A primary scale occurs. In addition, secondary scale occurs during rolling during rolling. These scales are pressed down by the rolls during rolling, causing roughness on the surface of the product, as well as causing hege scale defects, reducing crystal production yields, acceptance rates, and product value. It's big! As a preventive measure, we have conventionally used a decooler t that injects 1111 km of pressurized water from the rolling mill.
- Installed and descaling.

However, with conventional descalers, it is necessary to have 1) the effect of blowing away the scales that have been destroyed by the thermal force, and 1) the effect of destroying and blowing away the school left on the substructure side by the impact force. , extremely high pressure is applied to L&L, and equipment for rrK and 4 is also available at an art university.Also, due to the impact force I, descaling is insufficient due to the scale properties. There was a possibility that the primary scale would be 0 during rolling, and the surface of the product started to become rough. Therefore, in this invention, 9
As shown below, when the heated material undergoes rolling, the scale undergoes compressive strain. '
! M f e) ai! + EE Water, pressure 41 tons of air
After proposing a method for removing scale tubes by blowing RF, the method of the present invention will be explained in detail.

In addition, l@1#tJ is a layout diagram for descaling production related to conventional moths, and Fig. II2 is a layout diagram of a device q)-ga that implements the method of this invention, and wL3 addition (Jl) attack. Rabbi K
(bJ is the rolling roll portion 0allIIi-
Generally speaking, in the case of koji material pressing, etc., the billet 2 heated by the furnace heat F1 is extracted and rolled several times, as shown in Figure 1-.
3, it is poured and rolled. Billets),, 2 has a heating furnace l
Scale is generated during heating, and during rolling f
If scale is generated between B3 and one part of K is rolled without removing these scales, the scale formed on the surface of the billet 20 will be pressed down to the billet surface by the upper roll 5 and lower roll 6, and the product surface will be Rough skin and school blemishes occur.

Because of CO, a descaling treatment of 1 m was performed on the rolled rice moth, and the moth was descaled as shown in Jllll- (Rolling II 3).
Descaler-71r is installed on the entering piece and 1 billet 217)
From Descaler-7 to @*, Gaba% 100kp/f
The fR surface scale tube of billet 2 is removed by injecting extremely high pressure o4 pressure water of "fi"*. In contrast, the method of the present invention
L311 (a), (b) As shown in K (pressure a@sO between upper roll 5 and lower roll 60, billet 20 both sides and negative 11Cf side decooler device 8 is installed, billet 2''lIX upper and lower roll 5 and High-pressure underwater compressed air is blown onto the billet 20 free 11 while it is being bitten by the lower roll 6 and receiving the wji1+.
Since there is a shape IIK containing j11fL, the scale A- can be removed well. In addition, at this time, the high pressure water pressure s9 is
5 to 1 Qk1. /3
``It's enough, but in this point, like conventional moths, the descaler device on the inlet side sprays 100k)/cs+'' high pressure water before and after, but this kind of tk^ pressure water is a must. do not.

[Continued in detail above] In this method, high-pressure water force is sprayed at 0gE* to desk-ring the 11g steel material between the upper and lower rolls of the consolidating machine, which is different from conventional methods. Like (,1ookp/Takumi1's high pressure water is 4!p*'''rt
t<s~l Q $1 with pressure energy of about k1101
In addition, since the descaling was completely performed, the O1I surface properties were obtained as 4t), which was different from the conventional example. In particular, it is suitable for the front, which is a round drawing material for which there is a high demand for making sardines, and it can also be used for descaling.

4, - Sameaki @ 1 (2) in Yu's simple 1 is the placement of the descaling device that conventional moths despise.
ll11%$12@ is the equipment for carrying out this invention method0-
4t1o layout, al131i! 0(a)eRabiK(b
) U respectively t) llm- and exact thickness drawing of the rolling roll part・Symbol 1・・・・・・Heating furnace 2・・・・・・
・・Billet 3・・R・Rolling Il 4・・・・
・・Scale z1 ・・・・・Upper and lower a-lure ・・・Decooler 8・・・・・Side cooler device Fig. 1 Fig. 2

Claims (1)

[Claims] When the steel material is deformed by the upper and lower rolls, the steel material is sprayed with pressurized water or compressed air, or both, from both sides of the upper and lower rolls to remove the scale properties. O Descaling method.