Method for detecting and analyzing edge crack defects of hot-rolled steel strip
An analysis method and edge cracking technology, applied in the fields of analyzing materials, using radiation for material analysis, measuring devices, etc., can solve the problem of high cost of electron microscope equipment, and achieve the effect of solving edge cracking problems, rapid control, and overcoming limitations.
Pending Publication Date: 2020-07-21
山西建龙实业有限公司
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Problems solved by technology
[0012] The invention provides a method for detection and analysis of edge crack defects in hot-rolled steel strips, aiming to solve the problem that rolling steel production enterprises without metallographic detection can only rely on visual inspection of appearance and judge by experience; those with metallographic detection can use metallographic observation Check whether there is oxidation and decarburization at the edge cracks to judge whether there is a problem with the slab; due to the high cost of electron microscope equipment, some enterprises seldom use it
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Embodiment
[0042] Embodiment: (1) On-site investigation of edge cracks; focus on checking the appearance, color, and quantity of edge cracks, whether they are the same furnace number or whether the furnace numbers are connected, and whether the roll numbers are connected; Both sides; whether the batch of slabs have been in the furnace for a long time, whether the heating temperature is abnormal, etc., these are the basis for the final analysis and judgment; Quality problems; if necessary, check and record the number of times the converter is turned down during smelting, and the carbon at the end point.
[0043] (2) Cut sample blank;
[0044] a Select the edge cracked metallographic sample blank, cut a sample blank with a longitudinal length of 300 mm and a width of 30 mm along the edge crack, and then cut two vertical and transverse metallographic samples with edge cracks from the sample blank; the size of the longitudinal sample : Longitudinal 20mm*width 15-20mm, note that the sample m...
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The invention is suitable for the technical field of hot-rolled steel strip production, and provides a method for detecting and analyzing edge crack defects of a hot-rolled steel strip. The method comprises the steps of edge crack field investigation, sample blank cutting, sample preparation and detection test, edge crack reason analysis and acquisition of an analysis result. According to the invention, the limitation of previous detection is overcome, actual production conditions are combined with scientific experiments and theories, and problems existing in all procedures in the production process are reproduced comprehensively by carrying out actual investigation and research on an edge crack site, carrying out standard sampling and preparation and detecting and comprehensively analyzing each related item, so as to promote each procedure to quickly control the problems, solve the edge crack problem and recover production. The method is a feasible method for controlling the edge crack defects and actually solving the actual problems in production by combining the actual research with scientific data evidence according to apparent defects.
Description
technical field [0001] The invention belongs to the technical field of hot-rolled steel strip production, and in particular relates to a detection and analysis method for edge crack defects of a hot-rolled steel strip. Background technique [0002] Edge cracking is a common quality defect in the production process of hot-rolled steel strip production enterprises. This technology provides a comprehensive detection and analysis method for hot-rolled steel strip edge crack defects, which is suitable for hot-rolled steel strip production enterprises for the detection and analysis of edge crack defects. Analysis to provide accurate detection and analysis results for quality improvement and process control. According to the results of detection and analysis, it can be determined at which process point the problem occurred, so as to guide the corresponding process point to quickly control the defect problem, reduce quality loss, and quickly The restoration of normal production solv...
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Login to View More IPC IPC(8): G01N23/18G01N1/28
CPCG01N23/18G01N1/2806
Inventor 赵琼
Owner 山西建龙实业有限公司