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Quantitative method for center porosity or shrinkage cavity of casting blank

A technology of central looseness and shrinkage cavity, which is applied in measuring devices, processing detection response signals, and using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., to achieve accurate judgment, reduce errors, and simple operation

Pending Publication Date: 2020-10-27
ZHANGJIAGANG RONGSHENG SPECIAL STEEL CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Therefore, the quantitative evaluation method of continuous casting slab central porosity or central shrinkage cavity involved in the prior art still has limitations, and in-depth research in this area is needed

Method used

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  • Quantitative method for center porosity or shrinkage cavity of casting blank
  • Quantitative method for center porosity or shrinkage cavity of casting blank
  • Quantitative method for center porosity or shrinkage cavity of casting blank

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The method of the present invention measures the degree of porosity and shrinkage cavity in the center of furnace number 3623-287si.

[0037] (1) Sampling and sample preparation: take an 87si billet sample with a cross-section of 398mm*284mm and a height of 130mm, and process the surface of the billet to make the surface of the billet sample smooth and parallel to the top and bottom;

[0038] (2) Ultrasonic water immersion non-destructive testing: the 87si billet sample is subjected to ultrasonic water immersion non-destructive testing;

[0039] (3) Data calculation; set the loose or shrinkage cavity in the center of the slab as a single sphere, and count the size and number of spheres. After statistics, there are 28 holes with a radius of 15 μm and 3 holes with a radius of 25 μm. According to formula a) The calculated hole volume V hole is 0.00055m 3 , according to the formula b) vcast = abc calculate the billet volume Vcast is 0.014m 3 , according to the formula c)...

Embodiment 2

[0041] The method of the present invention measures the degree of porosity and shrinkage cavity in the center of furnace number 1835-592si.

[0042] (1) Sampling and sample preparation: take a 92si billet sample with a cross section of 398mm*284mm and a height of 130mm, and process the surface of the billet so that the surface of the billet sample is smooth and the upper and lower sides are parallel;

[0043] (2) Ultrasonic water immersion non-destructive testing: the 92si billet sample is subjected to ultrasonic water immersion non-destructive testing;

[0044] (3) Data calculation; set the loose or shrinkage cavity in the center of the slab as a single sphere, and count the size and number of spheres. After statistics, there are 20 holes with a radius of 15 μm and 6 holes with a radius of 25 μm. According to formula a) The calculated hole volume V hole is 0.000686m 3 , according to the formula b) vcast = abc calculate the billet volume Vcast is 0.014m 3 , according to the...

Embodiment 3

[0047] The method of the present invention measures the furnace number is 1931-592si central porosity and shrinkage cavity degree.

[0048] (1) Sampling and sample preparation: take a 92si billet sample with a cross section of 398mm*284mm and a height of 130mm, and process the surface of the billet so that the surface of the billet sample is flat and the upper and lower sides are parallel;

[0049] (2) Ultrasonic water immersion non-destructive testing: the 92si billet sample is subjected to ultrasonic water immersion non-destructive testing;

[0050] (3) Data calculation; set the loose or shrinkage cavity in the center of the slab as a single sphere, and count the size and number of spheres. After statistics, there are 25 holes with a radius of 15 μm and 6 holes with a radius of 25 μm. According to formula a) The calculated hole volume V hole is 0.000728m 3 , according to the formula b) vcast = abc calculate the billet volume Vcast is 0.014m 3 , according to the formula c)...

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Abstract

The invention discloses a quantitative method for center porosity or shrinkage cavity of a casting blank, provides a rapid and accurate detection method for center porosity or shrinkage cavity of a continuous casting blank, and provides an accurate and effective theoretical basis for a continuous casting process. The method comprises the following steps: (1) sampling and sample preparing; (2) ultrasonic water immersion nondestructive flaw detection; (3) data calculation; and (4) defect grading. The method has the advantage of being simple to operate in the sample treatment process; and meanwhile, the quantification of the defects is changed from two dimensions in the prior art to three dimensions, so that the defect degree of central porosity or shrinkage cavities can be judged more accurately, errors caused by conventional artificial subjective judgment are avoided, and the objectivity of defect grading is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgical detection, and relates to a method for evaluating the internal quality of continuous casting slabs, in particular to a quantitative method for loosening or shrinkage cavities in the center of casting slabs. Background technique [0002] In the past ten years, with the progress of my country's continuous casting technology, the entire steel industry has shown a trend of rapid development. Continuous casting technology is not only one of the symbols to measure the level of steel industry, but also has become the main technical driving force for the development of steel production. With the improvement of production capacity of steel enterprises and diverse market demands, billet quality inspection has become one of the key means to ensure the quality of continuous casting production. [0003] The central porosity and central shrinkage cavity of the slab are important defects that affect the q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/44
CPCG01N29/04G01N29/4427
Inventor 马建超王月李强张康晖
Owner ZHANGJIAGANG RONGSHENG SPECIAL STEEL CO LTD
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