CN103278424A - Quantitative evaluation method for continuous casting billet center porosity or center shrinkage cavity - Google Patents
Quantitative evaluation method for continuous casting billet center porosity or center shrinkage cavity Download PDFInfo
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- CN103278424A CN103278424A CN2013102261942A CN201310226194A CN103278424A CN 103278424 A CN103278424 A CN 103278424A CN 2013102261942 A CN2013102261942 A CN 2013102261942A CN 201310226194 A CN201310226194 A CN 201310226194A CN 103278424 A CN103278424 A CN 103278424A
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Abstract
The invention discloses a quantitative evaluation method for continuous casting billet center porosity or center shrinkage cavity. The method comprises: respectively cutting test samples with the same size on a continuous casting billet position with a 1/4 thickness of the continuous casting billet and the center of the continuous casting billet; processing, such that the surface of the test sample achieves a certain finish; adopting anhydrous alcohol to wash the surface of the test sample; and respectively measuring densities of the two test samples on different positions of the casting billet according to the QB/T2855-2007 standard measurement method, wherein a density of the test sample on the continuous casting billet position with a 1/4 thickness of the continuous casting billet is rho0, a density of the test sample on the center of the continuous casting billet is rho, and a [(rho0-rho)/rho0]*100% value is adopted to characterize the center porosity or center shrinkage cavity. With the present invention, the evaluation result is not interfered by man-made factors, the center porosity or center shrinkage cavity of the continuous casting billet can be quantitatively described, operation is simple, and the evaluation result is accurate.
Description
Technical field
The present invention relates to a kind of continuous casting billet internal soundness assessment method, specifically a kind of continuous casting billet center porosity or central pipe Quantitative Assessment Method.
Background technology
Continuous casting billet center porosity and central pipe are the major defects that influences slab quality, directly influence the quality of final stocking, describe continuous casting billet center porosity and central pipe defective exactly, casting parameters, equipment state and operation are significant for improving.Often employing sufur printing in continuous casting is produced, hot acid erosion, cold acid etching, electrolytic corrosion and dendrite corrosion low power detection method detect continuous casting billet quality, and hot acid erosion, cold acid etching and the detection of dendrite corrosion low power can be used for detecting continuous casting billet center porosity and central pipe degree.
(1) hot acid erosion and cold acid etching low power detection side ratio juris are basic identical, belong to the chemical corrosion category.Utilize steel itself to have unevenness or uncontinuity, opposing acid etching ability difference with different speed and different degree and acid solution generation electrochemical reactions, presents and is uneven or is of different shades, and shows the defective of steel.According to the inherent vice rank of standard rating steel, judge the quality good or not of strand again.
(2) dendrite corrosion low power detection method is electrochemical process to the sample detection faces, relies on soup to corrode to show the different homogeneitys of specimen surface.In electrolyte solution, the metal surface zones of different has different electrode potentials, forms a large amount of micro cells, and the zone that current potential is lower is that anode dissolves, and the higher zone of current potential is that negative electrode precipitates.The current potential of metal and alloy crystal boundary is lower than crystal grain inside usually, is the anode of micro cell, so corrode at first from crystal boundary, the detection faces after the corrosion demonstrates different homogeneitys.According to the inherent vice rank of standard rating steel, judge the quality good or not of strand.
At present, the internal soundness of continuous casting billet mainly adopts chemical method to handle the detection faces of continuous casting billet, by manual observation, with standard to recently judging the strand internal soundness, center porosity and central pipe also adopt the method.This detection and assessment method can't quantitative description continuous casting billet center porosity and central pipe degree, and adopt manual observation and judgement to be subject to extraneous factor and disturb, and evaluation result is inaccurate.
Summary of the invention
In order to overcome the shortcoming of existing detection technique, the purpose of this invention is to provide a kind of continuous casting billet center porosity or central pipe Quantitative Assessment Method.This method evaluation result is not subjected to interference from human factor, and is simple to operate, evaluation result is accurate.
The objective of the invention is to be achieved through the following technical solutions:
A kind of continuous casting billet center porosity or central pipe Quantitative Assessment Method is characterized in that this method may further comprise the steps:
1) in continuous casting billet width center, get the identical continuous casting billet sample of size at thickness of strand direction 1/4th places with the thickness of strand center respectively, obtain the Sample A at thickness of strand direction 1/4th places, the sample B of thickness of strand center;
2) Sample A and sample B all are processed into test samples, carry out surface clean, according to the measuring method of standard, measure the Sample A of strand diverse location and the density of sample B respectively; The density that obtains Sample A is
ρ 0 , sample B density be
ρ
3) with [(
ρ 0 -ρ)
/ ρ 0 The value of] * 100% characterizes the degree of center porosity or central pipe, finishes continuous casting billet center porosity or central pipe quantitative assessment.
Among the present invention, the processing of Sample A and sample B is grown up * wide * thick be 50mm * 60mm * 8mm test samples, its surfaceness reaches 0.1
μM, its quality is less than 200g.Test samples after the processing is cleaned with absolute ethyl alcohol, remove the test samples surface contaminants.According to the measuring method of QB/T 2855-2007 standard, measure the density of two test samples respectively.
Among the present invention, because thickness 1/4th place's strands exist center porosity and central pipe hardly, so the density difference of two test samples, thickness 1/4th place's sample densities are bigger.Thickness 1/4th place's test samples density are
ρ 0 With mid-depth place test samples density be
ρWith [(
ρ 0 -ρ)
/ ρ 0 The value of] * 100% characterizes the degree of center porosity or central pipe.
Evaluation result of the present invention is not subjected to interference from human factor, can quantitative description continuous casting billet center porosity and central pipe degree, and simple to operate, evaluation result is accurate.
Description of drawings
Fig. 1 is continuous casting billet sampling synoptic diagram of the present invention.
Fig. 2 is the synoptic diagram of Sample A among the present invention.
Embodiment
A kind of continuous casting billet center porosity or central pipe Quantitative Assessment Method, get the continuous casting billet of a certain steel grade of production, at continuous casting billet 1 width center, get the identical continuous casting billet sample of size respectively at thickness 1/4th places 2 and mid-depth place 3, obtain the Sample A at thickness of strand direction 1/4th places, the sample B of thickness of strand center; As shown in Figure 1, the throwing direction is for laterally.
Sample A and sample B all are processed into 50mm(length) * 60mm(is wide) * 8mm(is thick) test samples, its surfaceness requires to reach 0.1
μM, its quality is less than 200g.Test samples after the processing is cleaned with absolute ethyl alcohol, remove the testing surface dirt.Fig. 2 is the synoptic diagram of Sample A among the present invention, and wherein F is the throwing direction.
According to QB/T 2855-2007 standard-required, measure the density of two samples of strand diverse location respectively.Thickness 1/4th place's test samples density are
ρ 0 Be 7.436k/mm
3With mid-depth place test samples density be
ρBe 7.211k/mm
3
By [(
ρ 0 -ρ)
/ ρ 0 ] * 100% calculates this continuous casting billet center porosity and the central pipe degree is 3%.
Evaluation result of the present invention is not subjected to interference from human factor, and is simple to operate, evaluation result is accurate.
Claims (4)
1. a continuous casting billet center porosity or central pipe Quantitative Assessment Method is characterized in that this method may further comprise the steps:
1) in continuous casting billet (1) width center, get the identical continuous casting billet sample of size at thickness of strand direction 1/4th places (2) with thickness of strand center (3) respectively, obtain the Sample A at thickness of strand direction 1/4th places, the sample B of thickness of strand center;
2) Sample A and sample B all are processed into test samples, carry out surface clean, according to the measuring method of standard, measure the Sample A of strand diverse location and the density of sample B respectively; The density that obtains Sample A is
ρ 0 , sample B density be
ρ
3) with [(
ρ 0 -ρ)
/ ρ 0 The value of] * 100% characterizes the degree of center porosity or central pipe, finishes continuous casting billet center porosity or central pipe quantitative assessment.
2. according to the described continuous casting billet center porosity of claim 1 or central pipe Quantitative Assessment Method, it is characterized in that: the processing of Sample A and sample B is grown up * wide * thickly be 50mm * 60mm * 8mm test samples, its surfaceness reaches 0.1
μM, its quality is less than 200g.
3. continuous casting billet center porosity according to claim 1 or central pipe Quantitative Assessment Method, it is characterized in that: the test samples after will processing is cleaned with absolute ethyl alcohol, removes the test samples surface contaminants.
4. continuous casting billet center porosity according to claim 1 or central pipe Quantitative Assessment Method is characterized in that: according to the measuring method of QB/T 2855-2007 standard, measure the density of two test samples respectively.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575618A (en) * | 2013-11-22 | 2014-02-12 | 北京科技大学 | Measuring method for quantification of central looseness of casting blank |
| CN105300762A (en) * | 2015-10-16 | 2016-02-03 | 武汉钢铁(集团)公司 | Structure positioning sample preparation method of sheet |
| CN105333843A (en) * | 2015-10-20 | 2016-02-17 | 北京北冶功能材料有限公司 | Method for quantitative evaluation of the size of central pipe for a high temperature mother alloy rod |
| CN105403480A (en) * | 2015-11-12 | 2016-03-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Determination method for center density of continuous casting slab |
| CN105424554A (en) * | 2015-12-30 | 2016-03-23 | 中南林业科技大学 | Method for determining fatigue damage degree of metal material based on specific gravity measurement |
| CN105548207A (en) * | 2016-02-02 | 2016-05-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Quantitative determination method of central porosity or shrinkage of continuously cast slab |
| CN105716929A (en) * | 2016-03-04 | 2016-06-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Quantitative assessment method for continuous casting central pipe |
| CN107941807A (en) * | 2017-11-10 | 2018-04-20 | 首钢集团有限公司 | A kind of method of continuous casting steel billet central defect quantitative analysis |
| CN110263640A (en) * | 2019-05-16 | 2019-09-20 | 东软集团股份有限公司 | Slab shrinkage cavity recognition methods, device, storage medium and electronic equipment |
| CN111829808A (en) * | 2020-06-15 | 2020-10-27 | 包头钢铁（集团）有限责任公司 | Sampling method for analyzing content of rare earth inclusions in steel casting blank |
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| CN102495133A (en) * | 2011-12-12 | 2012-06-13 | 北京科技大学 | Quantitative analysis method for distribution of large impurities in casting blank |
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| CN102495133A (en) * | 2011-12-12 | 2012-06-13 | 北京科技大学 | Quantitative analysis method for distribution of large impurities in casting blank |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575618A (en) * | 2013-11-22 | 2014-02-12 | 北京科技大学 | Measuring method for quantification of central looseness of casting blank |
| CN105300762B (en) * | 2015-10-16 | 2018-04-17 | 武汉钢铁有限公司 | A kind of tissue positioning method for making sample of thin plate |
| CN105300762A (en) * | 2015-10-16 | 2016-02-03 | 武汉钢铁(集团)公司 | Structure positioning sample preparation method of sheet |
| CN105333843A (en) * | 2015-10-20 | 2016-02-17 | 北京北冶功能材料有限公司 | Method for quantitative evaluation of the size of central pipe for a high temperature mother alloy rod |
| CN105333843B (en) * | 2015-10-20 | 2018-05-18 | 北京北冶功能材料有限公司 | A kind of method of quantitative assessment high temperature master alloy stick central pipe size |
| CN105403480B (en) * | 2015-11-12 | 2018-05-01 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of assay method of continuous casting billet central dense degree |
| CN105403480A (en) * | 2015-11-12 | 2016-03-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Determination method for center density of continuous casting slab |
| CN105424554A (en) * | 2015-12-30 | 2016-03-23 | 中南林业科技大学 | Method for determining fatigue damage degree of metal material based on specific gravity measurement |
| CN105548207A (en) * | 2016-02-02 | 2016-05-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Quantitative determination method of central porosity or shrinkage of continuously cast slab |
| CN105548207B (en) * | 2016-02-02 | 2018-06-08 | 攀钢集团攀枝花钢铁研究院有限公司 | Continuous casting billet center porosity or the method for quantitatively determining of shrinkage cavity |
| CN105716929A (en) * | 2016-03-04 | 2016-06-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Quantitative assessment method for continuous casting central pipe |
| CN107941807A (en) * | 2017-11-10 | 2018-04-20 | 首钢集团有限公司 | A kind of method of continuous casting steel billet central defect quantitative analysis |
| CN110263640A (en) * | 2019-05-16 | 2019-09-20 | 东软集团股份有限公司 | Slab shrinkage cavity recognition methods, device, storage medium and electronic equipment |
| CN111829808A (en) * | 2020-06-15 | 2020-10-27 | 包头钢铁（集团）有限责任公司 | Sampling method for analyzing content of rare earth inclusions in steel casting blank |
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Application publication date: 20130904 |