descaling system
A technology of scale and dissolved oxygen concentration, applied in metal processing equipment, metal rolling, manufacturing tools, etc., can solve the problems of high equipment cost, cost of treatment agent, increased loss of scale, etc.
Active Publication Date: 2016-03-23
JFE STEEL CORP
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Problems solved by technology
[0004] However, the method of (1) not only increases the complicated coating work, but also increases the manufacturing cost due to the expense of the treatment agent.
In addition, the method (2) heats the steel material at a low temperature, so the burden on the rolling mill increases, and there are specifications that cannot be applied from the viewpoint of ensuring material properties due to the difference in the type of steel material.
In addition, the method of (3) is unrealistic due to the large equipment cost
In addition, since the method (4) is extracted from the heating furnace at a high temperature, the original unit price of the fuel increases and the scale loss increases.
Method used
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Embodiment
[0052] In order to verify the effect of the present invention, use figure 1 The descaling system 1 of the example of the present invention shown and image 3 In the descaling system 101 of the shown comparative example, water was sprayed to the material K to be rolled, and the descaling ability at that time was evaluated.
[0053] In the example of the present invention, a membrane-type vacuum degasser using a gas separation membrane is used as the degasser 90 , and a dissolved oxygen meter (DO meter) 91 is installed on the outlet side of the degasser 90 . Moreover, using the degasser 90 from the dissolved oxygen concentration in the raw water (5×10 -3 g / l) reduced to 1×10 -3 g / l.
[0054] On the other hand, in the comparative example, the degassing device 90 is not provided, therefore, the dissolved oxygen concentration (5×10 -3 g / l) of water is delivered to a plurality of pumps 70.
[0055] As the steel material of the material K to be rolled, the following steel materi...
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Abstract
Provided is a descaling system capable of removing scale more efficiently. The descaling devices (40, 50, 60) in the descaling system (1) have descaling nozzles (41, 51, 61) for spraying water on the surface of a steel plate (K) thereby removing scale formed on said surface. The descaling nozzles (41, 51, 61) are connected to pumps (70) that pressurize water from a water supply source (100) and spray water pressurized in the pumps (70) onto the surface of the steel plate (K). The entry side of the pumps (70) is provided with a de-aerating device (90) that reduces the dissolved oxygen concentration in the water to be delivered to the pumps (70) below the dissolved oxygen concentration in the raw water from the water supply source (100).
Description
technical field [0001] The present invention relates to a descaling system for descaling the surface of steel sheets. Background technique [0002] In a steel rolling line, the steel is put into a heating furnace with an oxidizing atmosphere, and heated in a temperature range of usually 1100-1300°C for several hours before hot rolling. During hot rolling, primary scale formed during heating and secondary scale formed after extraction from the heating furnace are generated. When the steel material is rolled without removing such scales, the scales invade the surface of the steel sheet as a product, forming scale defects and remaining. These scale defects significantly damage the surface properties of the steel sheet and serve as origins of cracks during bending, thereby having a significant impact on product quality. [0003] Therefore, as a method for solving this problem, the following proposals have been proposed: (1) coating an oxidation-resistant material on the surfac...
Claims
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IPC IPC(8): B21B45/08
CPCB21B45/08
Inventor 苅部建太西山贵史谷垣明彦
Owner JFE STEEL CORP