Method for making easy-to-pickle steel plate

An easy pickling and steel plate technology, applied in the field of metallurgy, can solve problems such as increasing environmental pollution, and achieve the effects of increasing pickling rate, improving the surface, and improving the rolling rhythm
CN102671992AInactive Publication Date: 2012-09-19NORTHEASTERN UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHEASTERN UNIV
Publication Date
2012-09-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a method for making an easy-to-pickle steel plate and belongs to the technical field of metallurgy. The method comprises the following steps of: smelting molten steel, and making a plate blank by continuous casting; descaling by using high pressure water, performing rough rolling on the descaled plate blank, performing finish rolling, cooling to the temperature of 500 to 550 DEG C, cooling at the speed of 5 to 10 DEG C per minute to obtain the steel which is easy to pickle and in a hot rolling state and of which the content of FeO is over 25 percent; performing finish rolling, cooling to the temperature of 650 to 700 DEG C at the speed of 1 to 5 DEG C per minute to obtain the steel which is easy to pickle and in a cold rolling state and has a uniform structure and of which the content of iron oxide scale FeO is less than 10 percent. By adopting the method, the thickness of the iron oxide scale is reduced by 20 to 30 percent compared with the conventional process, the pickling speed of the strip steel is increased from 150 to 160 m per minute to 180 to 200 m per minute compared with the conventional process, not only the pickling quality of the steel plate is guaranteed, but also the pickling efficiency is effectively improved.
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Description

technical field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a preparation method of an easy pickling steel plate. Background technique

[0002] The hot-rolled steel plate will produce a layer of oxide scale on the surface of the steel plate during the rolling process. The typical oxide scale structure consists of the outermost layer of thinner Fe 2 o 3 layer, intermediate Fe 3 o 4 layer and the FeO layer near the substrate side. According to the Fe-O equilibrium phase diagram, FeO is in a stable state at 570-1371°C; below 570°C, FeO undergoes eutectoid reaction to form α-Fe+Fe 3 o 4 mixture. Under different hot rolling conditions, the structure and thickness of the obtained iron oxide scale are changed. Domestically, there is still a lack of sufficient attention to the surface quality of products. The use of some energy-saving technologies (high-temperature hot charging and short-time heating, etc.) has resulted in ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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