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Method for preventing powdery peeling of hot-rolled pickling-free automobile beam steel scale

A technology of automobile girder steel and iron oxide scale, which is applied in metal rolling, metal rolling, workpiece surface treatment equipment, etc., can solve the problems of affecting surface quality, cost increase, powder peeling, etc., to improve conversion efficiency and meet the needs of users Requirements, the effect that is not easy to fall off

Active Publication Date: 2018-07-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the hot rolling industry is more inclined to adopt a low-silicon production strategy in order to control the surface quality. The reason is that silicon can cause surface quality problems such as red oxide scales on hot-rolled strip steel, and this phenomenon is particularly obvious in the hot-rolling process of high-silicon steel. Surface quality defects such as red rust caused by high silicon are relatively difficult to remove
In this case, in order to ensure the performance of the strip steel, the silicon content should be reduced as much as possible or other alternative elements should be used, but there will also be problems such as increased costs.
When pickling-free steel is used to produce automobile beam steel, most of it is mainly low-silicon, and the purpose is to form a 3 o 4 Mainly iron oxide scale, but when the silicon content is low, the surface of the generated iron oxide scale is not dense and uniform and powdery peeling occurs, affecting the surface quality

Method used

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  • Method for preventing powdery peeling of hot-rolled pickling-free automobile beam steel scale

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment comprises the following steps in turn:

[0024] The composition of the hot-rolled pickling-free automobile frame steel with a thickness of 8mm is C: 0.0083wt%; Mn: 0.726wt%; P: 0.0071wt%; S: 0.0031wt%; Al: 0.046wt%. The content of Si is strictly controlled to 0.0152wt%, and the rest is iron and unavoidable trace elements.

[0025] During the billet hot rolling process, the furnace time is strictly controlled to 200 minutes.

[0026] The entrance temperature of finishing rolling is less than 1030℃, the temperature of finishing rolling is controlled at 880℃, and the coiling temperature is controlled at 580℃.

[0027] During the descaling process, the first descaling and the second descaling are fully put into use, and the descaling water between the finishing mill stands is put into use.

[0028] Two-level automatic control of work roll cooling water, and two-level automatic control when the cooling water between racks is used and the water volume is inc...

Embodiment 2

[0032] This embodiment comprises the following steps in turn:

[0033] The composition of hot-rolled pickling-free automobile frame steel with a thickness of 8mm is C: 0.10wt%; Mn: 1.55wt%; P: 0.012wt%; S: 0.002wt%; Al: 0.047wt%; The content of Si is strictly controlled to be 0.297wt%, the content of Cr element is 0.225wt%, and the rest is iron and unavoidable trace elements.

[0034] During the billet hot rolling process, the furnace time is strictly controlled to 200 minutes.

[0035] The entrance temperature of finishing rolling is less than 1030℃, the temperature of finishing rolling is controlled at 880℃, and the coiling temperature is controlled at 580℃.

[0036] During the descaling process, the first descaling and the second descaling are fully put into use, and the descaling water between the finishing mill stands is put into use.

[0037] Two-level automatic control of work roll cooling water, and two-level automatic control when the cooling water between racks is ...

Embodiment 3

[0041] This embodiment comprises the following steps in turn:

[0042] The composition of the hot-rolled pickling-free automobile frame steel with a thickness of 8mm is C: 0.0083wt%; Mn: 0.726wt%; P: 0.0071wt%; S: 0.0031wt%; Al: 0.046wt%. The content of Si is strictly controlled to 0.0152wt%, and the rest is iron and unavoidable trace elements.

[0043] During the billet hot rolling process, the furnace time is strictly controlled to 200 minutes.

[0044] The entrance temperature of finishing rolling is less than 1030℃, the temperature of finishing rolling is controlled at 880℃, and the coiling temperature is controlled at 580℃.

[0045] During the descaling process, the first descaling and the second descaling are fully put into use, and the descaling water between the finishing mill stands is put into use.

[0046] Two-level automatic control of work roll cooling water, and two-level automatic control when the cooling water between racks is used and the water volume is incre...

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Abstract

The invention discloses a method for preventing powdery peeling of hot-rolled pickling-free automobile beam steel scale, and belongs to the technical field of steel rolling. The composition and ratioof Fe3O4 and FeO are adjusted by controlling the content of the silicon element to be within the range of 0.28-0.30wt%, and 0.200-0.225wt% of chrome element is added for preventing red scale from being produced. By optimizing temperature technology parameters, a set of fans are added in the rolling cooling process, the blast capacity is 40000 m<3> / h, air pressure is 255 Pa, the cooling speed in the rolling process is improved, and therefore the FeO-Fe3O4 conversion efficiency in the rolling process is improved. By means of the method, the content of Fe3O4 generated in pickling-free steel is about 80%, the content of FeO is about 4%, the surface quality is greatly improved, the phenomenon of powdery peeling of hot-rolled pickling-free automobile beam steel scale is effectively prevented, and meanwhile scale plasticity is improved.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and relates to a method for preventing powdery scale peeling of hot-rolled pickling-free automobile beam steel. Background technique [0002] The concept of pickling-free steel or "black steel" comes from the "Tight Scale" steel plate proposed by Japan's Sumitomo Metal. This steel is mainly made of black Fe 3 o 4 Mainly, it has high plasticity and the ability to be closely combined with the matrix steel, and is mainly used in the production and manufacture of automobile beams. Because the oxide scale can be deformed together with the steel plate without falling off in the subsequent deep processing process, it does not need to be pickled to remove the oxide scale to achieve the purpose of free pickling. However, when it is used for straightening in Kaiping, it will have varying degrees of powdery iron oxide peeling off, so some measures need to be taken to solve the problem of powdery iro...

Claims

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Application Information

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IPC IPC(8): B21B3/00B21B1/22B21B45/08B21B45/02B21B37/74C22C38/38C22C38/02C22C38/06
CPCB21B1/22B21B3/00B21B37/74B21B45/0218B21B45/08B21B2001/225C22C38/02C22C38/06C22C38/38
Inventor 孔宁陈晨李洪波张清东张杰
Owner UNIV OF SCI & TECH BEIJING
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