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Chemical corrosion detection method of hot rolling strip steel scale structure

A technology of hot-rolled steel strip and iron scale, applied in the preparation of test samples, measuring devices, scientific instruments, etc., can solve the problems of inaccurate X-ray diffraction results, application limitations, and X-ray impenetrability, etc. The effect of high equipment requirements, wide applicability, and simple equipment requirements

Inactive Publication Date: 2010-07-28
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] As mentioned above, the X-ray diffraction method has a limited depth of penetration into the sample due to the replacement of different targets for X-ray diffraction. For samples with thicker iron oxide scales, X-rays may not penetrate through them, while for thinner oxide scales, the X-rays may not penetrate. In the same way, X-rays may pass through the iron oxide scale and hit the metal substrate. Both of the above situations will cause inaccurate results of X-ray diffraction
Other methods require specialized equipment, which limits the application of these methods to a certain extent

Method used

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  • Chemical corrosion detection method of hot rolling strip steel scale structure
  • Chemical corrosion detection method of hot rolling strip steel scale structure
  • Chemical corrosion detection method of hot rolling strip steel scale structure

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The sample is a hot-rolled steel strip of SPHC steel heated to 1000°C, cooled to 500°C, held in air for 1000s, and directly quenched to room temperature. The cross-section is cut on the hot-rolled steel strip by the wire cutting method, and the acetone is used as the cleaning liquid to clean the cross-section by ultrasonic waves to remove surface oil.

[0031] The ultrasonic frequency is 40kHz, and the cleaning time is 15min.

[0032] Using the hot inlay method, the hot-rolled steel strip and the inlay material EPOMET_G were inlaid together to expose the cross section. The pressure condition was 290MPa during the inlay, the heating time was 1min, and the inlay was cooled for 3 minutes and taken out to obtain the inlay sample.

[0033] Use 800#, 1000#, 1200# and 1500# sandpaper to grind the section in sequence, using water as the medium, and grinding in the same direction until the scratches on the section are in the same direction. Grinding direction as figure 1 As sh...

Embodiment 2

[0039] The sample is the hot-rolled steel strip of TG510L automobile frame steel, finished rolling at 890°C and coiled at 570°C. The cross-section is cut on the hot-rolled steel strip by the wire cutting method, and the acetone is used as the cleaning liquid to clean the cross-section by ultrasonic waves to remove surface oil.

[0040] The ultrasonic frequency is 50kHz, and the cleaning time is 10min.

[0041] Using the hot inlay method, the hot-rolled steel strip and the inlay material EPOMET_G were inlaid together to expose the cross section. The pressure condition was 280MPa during inlay, the heating time was 1min, and the inlay sample was taken out after cooling for 4 minutes.

[0042] Use 800#, 1000#, 1200# and 1500# sandpaper to grind the section in sequence, using water as the medium, and grinding in the same direction until the scratches on the section are in the same direction.

[0043] The cross-section of the inlaid sample was polished for 8 minutes with abrasive pas...

Embodiment 3

[0048] The sample is a hot-rolled steel strip that is SPHC steel heated to 1000°C, cooled to 450°C, kept under vacuum for 100s, and directly quenched to room temperature. The cross-section is cut on the hot-rolled steel strip by the wire cutting method, and the acetone is used as the cleaning liquid to clean the cross-section by ultrasonic waves to remove surface oil.

[0049] The ultrasonic frequency is 60kHz, and the cleaning time is 5min.

[0050] Using the hot inlay method, the hot-rolled steel strip and the inlay material EPOMET_G were inlaid together to expose the cross section. The pressure condition was 270MPa during the inlay, and the heating time was 2min. After inlaying, it was cooled for 5min and taken out to obtain the inlay sample.

[0051] Use 800#, 1000#, 1200# and 1500# sandpaper to grind the section in sequence, using water as the medium, and grinding in the same direction until the scratches on the section are in the same direction.

[0052] The cross secti...

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Abstract

The invention discloses a chemical corrosion detection method of a hot rolling strip steel scale structure, which is characterized by comprising the following steps: (1) adopting a liner cutting method to cut a cross section on hot rolling strip steel, cleaning and removing oil stain on the cross section by ultrasonic wave; (2) adopting a hot inlay method to inlay the hot rolling strip steel in inlaid materials, and enabling the cross section to expose; (3) grinding the cross section with sand paper; (4) polishing the cross section of an inlaid sample by abrasive paste; (5) mixing hydrochloric acid and alcohol to prepare mixed solution, dipping the polished inlaid sample into the mixed solution for corrosion for 4-10 s, taking out the sample, and cleaning by utilizing alcohol to remove acid liquor; and (6) observing the cross section of the inlaid sample by a metalloscope. The method of the invention has simple requirement on equipment, wide applicability and accurate detection result and has significance for controlling steel surface quality in the production process of hot rolling strip steel.

Description

technical field [0001] The invention relates to a method for inspecting the oxide scale structure of strip steel, in particular to a method for chemical corrosion detection of the oxide scale structure of hot-rolled strip steel. 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. 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 difficult removal of iron oxide scales on the surface of hot-rolled strip steel, red rust on the surface of strip steel, iron sheet pressing and acid Problems such as washing residues have seriously hindered the improvement of product grades. Therefore, it is necessary to ...

Claims

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Application Information

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IPC IPC(8): G01N21/84G01N1/32G01N1/34
Inventor 刘振宇孙彬邹颖
Owner NORTHEASTERN UNIV
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