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Method for detecting content of each component in scale on surface of hot-rolled strip steel

A technology for surface oxidation and hot rolling of strip steel, which is applied in chemical method analysis, measuring device, preparation of test samples, etc., to facilitate corrosion and observation, and improve accuracy.

Pending Publication Date: 2022-01-14
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] This application provides a method for detecting the content of each component in the iron oxide scale on the surface of hot-rolled strip steel to solve the technical problem of how to retain the entire iron oxide scale layer and measure the content of each component on the surface oxide scale

Method used

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  • Method for detecting content of each component in scale on surface of hot-rolled strip steel
  • Method for detecting content of each component in scale on surface of hot-rolled strip steel
  • Method for detecting content of each component in scale on surface of hot-rolled strip steel

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Effect test

Embodiment 1

[0060] The invention provides a method for detecting the content of each component in the oxide scale on the surface of hot-rolled strip steel, the specific steps are as follows:

[0061] First, apply epoxy resin glue on the surface of the sample, and place it horizontally for 36 hours. After the surface glue is completely solidified, use a grinder to process the sample cross-section to reduce scratches on the cross-section during the preparation process, and use epoxy resin for cold mounting. The time is 24 hours, when the thickness of the iron sheet is 5 μm, the inlay with an angle is adopted, the sample and the inlay surface form an acute angle, and the angle range is 15°.

[0062] Grind the specimen section on sandpaper. First, use 220-grain SIC sandpaper for initial grinding to remove scratches on the cross-section of the sample. The grinding time is 20 minutes. The rougher the cross-section, the longer the grinding time. Secondly, use 320-grit SIC sandpaper to remove th...

Embodiment 2

[0065] The invention provides a method for detecting the content of each component in the oxide scale on the surface of hot-rolled strip steel, the specific steps are as follows:

[0066] First, apply epoxy resin glue on the surface of the sample, and place it horizontally for 40 hours. After the surface glue is completely solidified, use a grinder to process the sample section to reduce the scratches of the section during the preparation process; use epoxy resin for cold mounting, inlaying The time is 36 hours, and when the thickness of the iron sheet is 10 μm, the sample is mounted horizontally, and there is no need to cold mount the sample section with an angle.

[0067] Grind the specimen section on sandpaper. First, use 220-grain SIC sandpaper for initial grinding to remove scratches on the cross-section of the sample. The grinding time is 30 minutes. The rougher the cross-section, the longer the grinding time. Secondly, use 320-grit SIC sandpaper to remove the scratches...

Embodiment 3

[0070] The invention provides a method for detecting the content of each component in the oxide scale on the surface of hot-rolled strip steel, the specific steps are as follows:

[0071] First, apply epoxy resin glue on the surface of the sample, and place it horizontally for 48 hours. After the surface glue is completely solidified, use a grinder to process the sample section to reduce scratches on the section during the preparation process, and use epoxy resin for cold mounting. The time is 48 hours, when the iron sheet is 4 μm, it is necessary to use an angled inlay, the sample and the inlay surface form an acute angle, and the angle range is 45°.

[0072] Grind the specimen section on sandpaper. First, use 220-grain SIC sandpaper for initial grinding to remove scratches on the cross-section of the sample. The grinding time is 40 minutes. The rougher the cross-section, the longer the grinding time. Secondly, use 320-grit SIC sandpaper to remove the scratches caused by rou...

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Abstract

The invention relates to the field of hot-rolled scale detection and particularly relates to a method for detecting the content of each component in scale on the surface of hot-rolled strip steel. The method comprises the following steps of coating an upper surface and / or a lower surface of to-be-detected hot-rolled strip steel containing oxide scale with an adhesive, cutting out according to a preset size in the thickness direction, and carrying out cold inlaying on at least one three-dimensional sample to obtain a cured inlaying body inlaid with at least one three-dimensional sample, carrying out smoothness treatment and corrosion treatment on the cross section to obtain the cured inlay with the corroded cross section; Fe3O2 and FeO are corroded, Fe3O4, eutectoid structures and matrixes being not corroded, a surface of the corroded iron sheet being uneven, and the areas of multiple contrast degrees in the corroded section being obtained. According to the areas of the multiple contrast degrees, the content of each component in the oxide scale in the corrosion section is obtained, the components can be clearly distinguished under a metallographic microscope, the whole oxide scale layer is reserved, and measurement precision of each component is improved.

Description

technical field [0001] The application relates to the field of hot-rolled iron scale detection, in particular to a method for detecting the content of each component in the iron oxide scale on the surface of a hot-rolled steel strip. Background technique [0002] Hot-rolled strip is accompanied by oxidation during the cooling process from slab reheating to finish rolling to the coiling process. Since the surface of the strip steel is constantly oxidized during the hot rolling process, and the surface oxide scale is formed while removing phosphorus and undergoing rolling denaturation at the same time, the oxidation process on the surface of the hot rolled strip steel is very complicated, not a simple three-layer structure: the outermost Layer Fe 2 o 3 , middle layer, Fe 3 o 4和 The innermost layer is FeO. The scale structure on the surface of hot-rolled strip determines its surface quality to a certain extent. Only by quantitatively characterizing the different phase stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/00G01N1/32G01N1/36
CPCG01N31/005G01N1/36G01N1/32
Inventor 魏兵刘洋王立新张鹏武黄海娥陶文哲
Owner 武汉钢铁有限公司
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