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Device for removing oxide layer on surface of hot steel rolling belt

A technology for oxide skin and hot-rolled steel, which is applied in workpiece lubrication devices, workpiece surface treatment equipment, metal rolling, etc., and can solve problems such as surface scars, load reduction in pickling process, and large amount of oxide skin

Inactive Publication Date: 2005-01-12
NISSHIN STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the amount of scale carried into the pickling tank is relatively large, and therefore, the load of the pickling process cannot be reduced as much as expected
[0006] In addition, scale fragments that are detached from the surface of the hot-rolled strip by rolling scale rolling, but then firmly reattach or are pressed back onto the surface of the strip, are difficult to remove during the pickling process, and Often cause some defects (such as surface scars) in the subsequent cold rolling process
Although abrasive grains can be used for grinding to remove scale fragments, there are always some scale fragments remaining on the surface of the steel strip

Method used

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  • Device for removing oxide layer on surface of hot steel rolling belt
  • Device for removing oxide layer on surface of hot steel rolling belt
  • Device for removing oxide layer on surface of hot steel rolling belt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] exist figure 1 On the descaling production line shown, before pickling, two kinds of hot-rolled steel strips with a thickness of 2.5mm are cold-rolled with a rolling reduction of 5-50%. The composition and composition of the hot-rolled steel strips used in this example are shown in Table 1. On one of the steel strips, a rolling scale layer with an average thickness of 15 microns was formed, while on the other steel strip A rolled scale layer with an average thickness of 7 microns was obtained.

[0060]

C

Si

mn

P

S

Ti

Fe

0.003

0.01

0.15

0.012

0.008

0.086

The remaining part

[0061] After the steel strip is cold-rolled, use a nylon brush containing silica or alumina abrasive grains (made of three filaments with a diameter of 1.6mm twisted together, and its outer diameter is 360mm) to contact the surface of the steel strip at ...

Embodiment 2

[0068] Using the same descaling production line as in Example 1, a hot-rolled steel strip with a thickness of 2.7 mm was cold-rolled at a rolling reduction of 50% before pickling. The ingredients and compositions of the hot-rolled steel strips used in Example 2 are shown in Table 2. Rolling scale with an average thickness of 7-15 microns adheres to the surface of the steel strip. In heavy rolling process, water or water-soluble rolling oil at 4.5m 3 The flow rate per minute is sent to the roll gap between the hot-rolled steel strip 1 and the work roll with a diameter of 450mm. The friction coefficient of the water-soluble rolling oil is adjusted within the range of 0.05-0.19 (=0.015+450 / 7500-50 / 2500).

[0069]

steel type

Chemical composition (the rest is Fe, wt%)

C

Si

mn

P

S

Ti

A

0.040

0.01

0.20

0.013

0.010

-

B

0.003

0.01

0.15

0.012

...

Embodiment 3

[0077] A hot-rolled steel strip with a thickness of 2.7 mm was cold-rolled at a rolling reduction of 50% before pickling. The steel strip used in this example is the same as that used in Example 2.

[0078] In order to study the effect of scale fragments adhering to the work rolls, the work rolls were treated as follows during cold rolling.

[0079] Case 1:

[0080] A roller-shaped polisher made of nylon brushes containing silica or alumina abrasive grains and whose length is equal to the barrel length of each work roll is pressed against the surface of the work roll with a pressure of 1 to 4 MPa, and is driven by a driving device to rotate . Each polisher, except for the portion facing the work rolls, is housed within the aspirator housing. The air around the polisher is 1~20Nm 3 / min (nanometer 3 / min) flow is inhaled.

[0081] Case 2:

[0082] The nozzle with the gap length equal to the barrel length of each work roll is directed to the surface of the work roll, and ...

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Abstract

The present invention relates to a device for removing the surface oxidation skin of a hot rolled steel strip. The device comprises a cold rolling mill for cold rolling a hot rolled steel strip, mill roll scale is adhered to the surface of the hot rolled steel strip, when the rolling amount of draught is 30% or more; a brush roll arranged on the downstream side of the cold rolling mill for removing the oxide skin which is peeled off by cold rolling or is adhesion relaxational; a spray jet arranged on the downstream side of the brush roll; a tension roll arranged on the downstream side of the spray jet for applying tension to the steel strip; a pickling tank arranged on the downstream side of the tension roll. The device is capable of effectively removing the surface oxide skin of a hot rolled steel strip and obviously decreasing the load of next acid washing procedure.

Description

[0001] This application is a divisional application of Chinese Invention Patent Application No. 96191202.2. technical field [0002] The invention relates to a device for mechanically removing scale on the surface of hot-rolled steel strips. Background technique [0003] Hot-rolled steel strip is usually covered with a rolled scale, which consists mainly of oxides. If the hot-rolled steel strip is also subjected to various treatment processes such as cold rolling, it causes defects such as surface scratches and cracks caused by rolling scale. Because of this, pickling is generally used to remove scale from the surface of the hot-rolled steel strip before the hot-rolled steel strip is subjected to further treatment steps. In this process, there are problems in the pickling part, the recycling process of waste acid and the adjustment of the ability to remove scale. The infiltration of hydrogen generated during the pickling process will also deteriorate the properties of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/36B21B28/04B21B45/02B21B45/06
CPCB21B1/36B21B45/0251B21B45/06B21B28/04
Inventor 冈野哲彦三喜俊典大塚正树早川淳也
Owner NISSHIN STEEL CO LTD
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