A Quantitative Evaluation Method for Center Macro Segregation of Billets

A macro-segregation and quantitative evaluation technology, applied in material inspection products, testing metals, etc., can solve problems such as deviation and inaccurate drilling chemical analysis results, and achieve the effect of avoiding the deviation of the center segregation analysis results of the cast billet.

Active Publication Date: 2018-10-19
SHOUGANG CORPORATION
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Problems solved by technology

[0007] The purpose of the present invention is to provide a quantitative evaluation method for the macro segregation of the center of the billet, which solves the possible deviation between the sampling position and the actual solidification physical center in the quantitative detection process of the carbon segregation in the center of the billet, and the possible inaccurate drilling chemical analysis results The problem

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  • A Quantitative Evaluation Method for Center Macro Segregation of Billets
  • A Quantitative Evaluation Method for Center Macro Segregation of Billets
  • A Quantitative Evaluation Method for Center Macro Segregation of Billets

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Embodiment Construction

[0023] Using the quantitative evaluation method for billet center macro-segregation provided by the patent of the present invention, the internal quality of the billet SWRH82B billet with a cross-sectional size of 160mm×160mm was evaluated, and compared with the detection results of the geometric center. The specific casting machine mainly The basic parameters and continuous casting process parameters are shown in Table 1:

[0024] Table 1 Basic process parameters of casting machine and continuous casting process

[0025]

[0026] The specific steps and parameters are as follows:

[0027] 1) Find out the solidification physical center of the slab by hot acid etching method, that is, the specific position of the final solidification in the cross section. First, the billet is processed into a 15mm thick low-magnification sample, and the corrosion test is carried out with an industrial hydrochloric acid solution with a volume ratio of 1:1. The temperature of the hydrochloric ...

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Abstract

A quantitative evaluating method for square billet center macrosegregation belongs to the technical field of metallurgical analysis. The quantitative evaluating method comprises the steps of finding out a solidifying physical center of a casting blank through a hot acid etching method; taking samples of 5 points through drilling, taking 3-5g per point and measuring the soluble element concentration of different positions to serve as evaluating basis of macrosegregation; using a data analyzing method to evaluate a center segregation average value and standard deviation according to segregation data of different samples and reflecting the quality controlling level and the controlling stability in a billet. The quantitative evaluating method has the advantages of accurately finding out the actual solidifying physical center of the casting blank, avoiding casting blank center segregation analysis result deviation caused by sampling position factors and providing accurate reference for quality monitoring or technique improvement.

Description

technical field [0001] The invention belongs to the technical field of metallurgical analysis, and in particular relates to a quantitative evaluation method for macro segregation in the center of billets. Background technique [0002] Due to the segregated crystallization and dendrite solidification characteristics of molten steel, central segregation defects will inevitably occur in the centerline region of the final solidification of the slab due to solute accumulation and difficulty in molten steel flow feeding. [0003] The methods for evaluating the control level of macro segregation in the center of the billet are divided into qualitative evaluation and quantitative evaluation. The qualitative evaluation is mainly through low-magnification structure and defect inspection. Qualitative evaluation of low-magnification quality. This qualitative evaluation method is affected by testing standards and subjective judgment factors of testing personnel, and its evaluation resul...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/20
CPCG01N33/20
Inventor 刘珂孙齐松丁宁周德孔祥涛王畅江金东李正松
Owner SHOUGANG CORPORATION
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