CN105403480B - A kind of assay method of continuous casting billet central dense degree - Google Patents
A kind of assay method of continuous casting billet central dense degree Download PDFInfo
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- CN105403480B CN105403480B CN201510778910.7A CN201510778910A CN105403480B CN 105403480 B CN105403480 B CN 105403480B CN 201510778910 A CN201510778910 A CN 201510778910A CN 105403480 B CN105403480 B CN 105403480B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
Abstract
The invention belongs to metal material performance detection field, and in particular to a kind of assay method of continuous casting billet central dense degree.The assay method of continuous casting billet central dense degree of the present invention, comprises the following steps：A, respectively in continuous casting billet lateral cross section corner far from taking an equal amount of Sample A and B at the subcutaneous 9~11mm in both sides and lateral cross section center；B, Sample A and B surface are processed, cleaned, the density p of test sample A0With the quality m of sample BB；C, seal with wax to sample B, test the volume V of the sample B after sealing with wax；D, the ρ measured0、mBSubstituted into V in formula (I) and measure continuous casting billet central porisity rate
Description
Technical field
The invention belongs to metal material performance detection field, and in particular to a kind of measure side of continuous casting billet central dense degree
Method.
Background technology
In the past 20 years, the progress of China's continuous casting and continuous casting technology, has promoted the development of whole steel industry.Continuous casting skill
One of the mark of art as steel and iron industry level, has become the major technique power of steel production development.With production capacity
Raising and the market demand it is rich and varied, slab quality ensure all the more show its importance.It is continuous casting life that continuous casting billet quality, which is examined,
One of key means that yield and quality ensures.
The central dense degree (including center porosity and central pipe etc.) of continuous casting billet is the major defect for influencing slab quality,
The center porosity and central pipe defect of accurate description strand, the improvement to continuous casting process are of great significance.In continuous casting
Middle warp is frequently with three kinds of sulphur print, hot acid wash and cold acid wash low power detection methods detection slab qualities.And hot acid wash and
Cold acid wash can detect continuous casting billet center porosity and central pipe degree.
Hot acid wash is that the sample processed is placed in dilute hydrochloric acid to heat a period of time, since dilute hydrochloric acid is to the crackle of steel
Around segregant, be mingled with, crystal boundary and matrix have different degrees of corrosion, therefore, the surface washed through hot acid show crackle,
Segregation accumulation regions, be mingled with and crystal boundary etc..Cold acid wash and hot acid wash effect are essentially identical, and are not required descaling bath and heating to fill
Put.Both approaches pickling degree is difficult to control, and corrosion deficiency or excessive corrosion easily occurs, and using manually observation and judge easy
Disturbed by extraneous factor, evaluation result is inaccurate.
Application No. " 201310226194.2 ", entitled " a kind of continuous casting billet center porosity or central pipe quantify
Assessment method ", discloses a kind of continuous casting billet center porosity or central pipe Quantitative Assessment Method, this method is in thickness of strand four
/ mono- cuts the identical sample of size respectively with strand center, specimen surface is reached certain finish by processing, makes
Specimen surface is cleaned with absolute ethyl alcohol.According to the measuring method of QB/T2855-2007 standards, it is different that strand is measured respectively
The density of two samples of position.Sample density is ρ at thickness of strand a quarter0, continuous casting billet center sample density is ρ,
WithValue characterization center porosity or central pipe degree.This patent is using drainage measurement density, side
Method is coarse, and operation is comparatively laborious, on the one hand thinks that operation factors have a great influence, and another aspect sample surfaces do not take sealing to survey
It is larger to measure resultant error；In addition the patent assumes to select sample consistency maximum at thickness of strand a quarter and is dredged with center
Loose area's sample compares, and in practice thickness of strand a quarter be mostly column crystal and easily it is cracked and segregation, consistency
It not should be maximum position in most cases, center porosity area is generally isometric crystalline region and slab thickness a quarter columnar zone ratio
Less it is for most ideal method.
Application No. " 201410792132.2 ", entitled " a kind of detection method of the subcutaneous quality of strand " is open
The detection method of the subcutaneous quality of strand a kind of, the detection method of the subcutaneous quality of this kind of strand, comprises the following steps：(1) cool down：
Water cooling or slow cooling are carried out to strand；(2) burn off：After slab cooling, burn off is carried out to the surface of strand, burn off casting billet surface
Iron scale and part surface；Wherein the depth of burn off is 1~3mm；(3) clear up：The burn off position of strand is rinsed with water, is used in combination
Oxygen is purged；(4) observe：The subcutaneous mass defect of strand is observed by the burn off position of strand.The detection method is suitable for
The online or offline quick inspection subcutaneous quality of strand.The invention stresses the subcutaneous quality testing of strand, is not directed to strand interior solid
The detection of degree.
Application No. " 201110004123.9 ", entitled " continuous casting billet solidified structure and defect dendrite corrosion low power
Testing reagent and preparation method ", discloses a kind of continuous casting billet solidified structure and defect dendrite corrosion macroscopic examination reagent and preparation
Method, reagent constituent are by mass percentage：Copper chloride 0.28~1.09%, magnesium chloride 0.17~0.27%, iron chloride
0.56~1.60%, mass concentration be 36~38% hydrochloric acid 1.28~1.30%, absolute ethyl alcohol 54.70~55.80%, surplus
For water.Preparation method is：Water is added in a reservoir, adds copper chloride, magnesium chloride, iron chloride and hydrochloric acid；Wait added original
After material is completely dissolved, absolute ethyl alcohol is added, is stirred evenly.The patent solves other corrosion reagents can not the company of clearly displaying
The problem of strand dendrite solidified structure, carry out continuous casting billet solidified structure using the reagent of the patent and defect dendrite corrode low power
Examine, the continuous casting steel billet internal flaw of display has the characteristics that not expand, do not reduce display as former state.The invention belongs to traditional low
The application in slab quality detection is examined again, and round of visits is long, and human factor influence is bigger, to strand interior solid
Spend no stringent quantitative criterion.
In summary, quantifying for neither one standard is gone back in the detection at present for continuous casting billet central dense degree or voidage
Analysis method, majority of case is obtained by artificial qualitative analysis, there are gross error, so, in prior art basis
Lay down a criterion quantitative analysis method, can fast and accurately reflect the situation of strand central dense degree, be provided for continuous casting process
Accurate and effective theoretical foundation is very necessary.
The content of the invention
The technical problems to be solved by the invention are to provide one kind from interference from human factor, can fast and accurately reflect casting
The situation of base central dense degree, the survey of the continuous casting billet central dense degree of accurate and effective theoretical foundation is provided for continuous casting process
Determine method.
A kind of assay method of continuous casting billet central dense degree of the present invention, comprises the following steps：
A, continuous casting billet lateral cross section corner is taken to be denoted as A far from cuboid sample is taken at the subcutaneous 9~11mm in both sides；In continuous casting billet
Lateral cross section center take with an equal amount of cuboid samples of A, be denoted as B；
B, Sample A and B surface are processed, cleaned, the density p of test sample A0With the quality m of sample BB；
C, seal with wax to sample B, test the volume V of the sample B after sealing with wax；
D, the ρ measured in b, step c0、mBSubstituted into V in formula (I) and measure continuous casting billet central porisity rate θ：
E, the θ that Step d is measured is substituted into formula (II) the central dense degree D for obtaining continuous casting billet：
(II) D=1- θ.
A kind of assay method of continuous casting billet central dense degree described above, the wherein size of Sample A and sample B for 45~
55mm × 45~55mm × 45~55mm.
Further, as preferred technical solution, a kind of assay method of continuous casting billet central dense degree described above,
Sample A and sample B are preferably sized to 50mm × 50mm × 50mm.
A kind of assay method of continuous casting billet central dense degree described above, wherein Sample A and sample B surface using alcohol into
Row cleaning.
A kind of assay method of continuous casting billet central dense degree described above, is for maximum wherein sealing with wax to sample B
Degree reduces error caused by specimen surface cavity, and sample B is sealed with wax thickness≤0.1mm of layer.
A kind of assay method of continuous casting billet central dense degree of the present invention, samples taken is in thin at the subcutaneous 10mm of continuous casting billet
Crystalline region (equiax crystal) one side consistency is higher, on the other hand identical with the center porosity area crystal form with position equiax crystal, comparable
Property is stronger；Seal with wax center puffs sample error caused by can at utmost reducing specimen surface cavity.The present invention takes
Sample can fast and accurately reflect the situation of strand central dense degree, not be affected by human factors, for continuous casting process provide it is accurate,
Effective theoretical foundation.
Embodiment
A kind of assay method of continuous casting billet central dense degree of the present invention, comprises the following steps：
A, continuous casting billet lateral cross section corner is taken to be denoted as A far from cuboid sample is taken at the subcutaneous 9~11mm in both sides；In continuous casting billet
Lateral cross section center take with an equal amount of cuboid samples of A, be denoted as B；
B, Sample A and B surface are processed, with alcohol washes, with the density p of real density analyzer test sample A0,
With the quality m of precision balance test sample BB；
C, seal with wax to sample B, the volume V of the sample B after being sealed with wax with the test of real density analyzer；
D, the ρ measured in b, step c0、mBSubstituted into V in formula (I) and measure continuous casting billet central porisity rate θ：
E, the θ that Step d is measured is substituted into formula (II) the central dense degree D for obtaining continuous casting billet：
(II) D=1- θ.
A kind of assay method of continuous casting billet central dense degree described above, the wherein size of Sample A and sample B for 45~
55mm × 45~55mm × 45~55mm.
Sample A of the present invention is taken from the cube block about at 10mm under continuous casting billet epidermis, be because strand herein almost
There is no center porosity and central pipe and it is equiax crystal, consistency is higher；And sample B is derived from continuous casting billet lateral cross section center
The heart, is because the center porosity and central pipe of continuous casting billet herein are the largest, can so make center porosity area with being all
The crystal form of equiax crystal is identical, and comparativity is high.
Further, as preferred technical solution, a kind of assay method of continuous casting billet central dense degree described above,
Sample A and sample B are preferably sized to 50mm × 50mm × 50mm.
Need to be processed specimen surface before present invention test, polish, clean, be to remove detection specimen surface
Dirt, while specimen surface is had certain finish, reduce influence of the impurity to experiment test.
Sample A and B surface are processed, after alcohol washes, is tested and tried with 3H-2000TD1 type real densities analyzer
The density p of sample A0, because 3H-2000TD1 type real densities analyzer can directly accurate test sample density and volume, Ran Houyong
The quality m of high precision balance test sample BB。
A kind of assay method of continuous casting billet central dense degree described above, is for maximum wherein sealing with wax to sample B
Degree reduces error caused by specimen surface cavity, and specially granular accurate paraffin is put into the wax stove of temperature control, is set
Temperature since liquid paraffin is at 100 DEG C, meets the effect that room temperature object is up to speed leaching rapid-curing cutback, by clip in 100 DEG C of heating
Sample B immersion speed is picked up, one layer that sample B surface coating will be very thin as sugar-coat, in order to seal the hole of specimen surface
Gap, while reduce influence of the wax layer to sample B volume, sample B seal with wax layer thickness should≤0.1mm, then use 3H-
The volume of 2000TD1 type real density analyzer test samples B, because layer of sealing with wax is very thin, almost will not produce the volume of sample B
Influence, can be ignored.
The cuboid sample that subcutaneously to take size respectively with strand center about at 10mm in continuous casting billet identical, by processing, clear
Washing and sealing with wax makes specimen surface reach certain finish, and two samples are carried out using 3H-2000TD1 type real density analyzers
Density measurement, sample density is ρ at the subcutaneous 10mm of continuous casting billet0, continuous casting billet center sample density is ρ, with's
Value characterization strand central dense degree.
The embodiment of the present invention is further described with reference to embodiment, is not therefore limited the present invention
System is among the embodiment described scope.
1 U78CrV Properties of Heavy Rail Steel strand central denses degree of embodiment measures.
Continuous casting cross dimension is the U78CrV steel blooms of 320mm × 410mm, employs the big pressure of solidification end
Control；In continuous casting billet lateral cross section corner far from cuboid sample is taken at the subcutaneous 10mm in both sides, A is denoted as；In continuous casting billet lateral cross section
Center take with an equal amount of cuboid samples of A, be denoted as B；A and B sample sizes are about 50mm × 50mm × 50mm.By sample
A and B surface are processed, and are cleaned with alcohol；With the density p of 3H-2000TD1 type real density analyzer test samples A0For
7.9487g/cm3, the quality with high accuracy balance test sample B is mBFor 491.79g, seal with wax to sample B, use 3H-
The volume V of sample B is 62.3546cm after the test of 2000TD1 type real densities analyzer is sealed with wax3。
Pass through formulaIt is about 0.70% that porosity, which is calculated, and strand central dense degree is used
The value characterization of porosity θ.
So central dense degree D=1- θ=99.30% of continuous casting billet.
2 U78CrV steel strand central denses degree of embodiment measures.
Continuous casting cross dimension is the U78CrV steel blooms of 320mm × 410mm, employs dynamic soft-reduction control
System；In continuous casting billet lateral cross section corner far from cuboid sample is taken at the subcutaneous 10mm in both sides, A is denoted as；In continuous casting billet lateral cross section just
Center take with an equal amount of cuboid samples of A, be denoted as B；A and B sample sizes are about 50mm × 50mm × 50mm.By Sample A
It is processed with B surface, is cleaned with alcohol；With the density p of 3H-2000TD1 type real density analyzer test samples A0For
7.9360g/cm3, the quality with high accuracy balance test sample B is mBFor 486.83g, seal with wax to sample B, use 3H-
The volume V of sample B is 61.9016cm after the test of 2000TD1 type real densities analyzer is sealed with wax3。
Strand central dense degree is characterized with the value of porosity θ.Pass throughPorosity is calculated
About 0.90%.
So central dense degree D=1- θ=99.10% of continuous casting billet.
3 45# steel strand central denses degree of embodiment measures.
Continuous casting cross dimension is the 45# steel blooms of 360mm × 450mm, employs the big pressure control of solidification end
System；In continuous casting billet lateral cross section corner far from cuboid sample is taken at the subcutaneous 10mm in both sides, A is denoted as；In continuous casting billet lateral cross section just
Center take with an equal amount of cuboid samples of A, be denoted as B；A and B sample sizes are about 50mm × 50mm × 50mm.By Sample A
It is processed with B surface, is cleaned with alcohol；With the density p of 3H-2000TD1 type real density analyzer test samples A0For
7.9453g/cm3, the quality with high accuracy balance test sample B is mBFor 496.77g, seal with wax to sample B, use 3H-
The volume V of sample B is 62.9138cm after the test of 2000TD1 type real densities analyzer is sealed with wax3。
Strand central dense degree is characterized with the value of porosity θ.Pass throughPorosity is calculated
About 0.62%.
So central dense degree D=1- θ=99.38% of continuous casting billet.
Claims (4)
- A kind of 1. assay method of continuous casting billet central dense degree, it is characterised in that：Comprise the following steps：A, continuous casting billet lateral cross section corner is taken to be denoted as A far from cuboid sample is taken at the subcutaneous 9~11mm in both sides；It is horizontal in continuous casting billet Section center take with an equal amount of cuboid samples of A, be denoted as B；B, Sample A and B surface are processed, cleaned, the density p of test sample A0With the quality m of sample BB；C, seal with wax to sample B, the volume V of the sample B after being sealed with wax using the test of vacuum densimeter；Wherein, the method sealed with wax For：Speed is picked up after sample B immerses liquid paraffin, and the temperature of liquid paraffin is 100 DEG C；Sample B is sealed with wax thickness≤0.1mm of layer；D, the ρ measured in b, step c0、mBSubstituted into V in public formula (I) and measure continuous casting billet central porisity rate θ：<mrow> <mo>(</mo> <mi>I</mi> <mo>)</mo> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mi>&theta;</mi> <mo>=</mo> <mo>(</mo> <mn>1</mn> <mo>-</mo> <mfrac> <msub> <mi>m</mi> <mi>B</mi> </msub> <mrow> <msub> <mi>&rho;</mi> <mn>0</mn> </msub> <mo>&CenterDot;</mo> <mi>V</mi> </mrow> </mfrac> <mo>)</mo> <mo>&times;</mo> <mn>100</mn> <mi>%</mi> <mo>;</mo> </mrow>E, the θ that Step d is measured is substituted into formula (II) the central dense degree D for obtaining continuous casting billet：(II) D=1- θ.
- A kind of 2. assay method of continuous casting billet central dense degree according to claim 1, it is characterised in that：Sample A and sample B Size be 45~55mm × 45~55mm × 45~55mm.
- A kind of 3. assay method of continuous casting billet central dense degree according to claim 2, it is characterised in that：Sample A and sample B Size be 50mm × 50mm × 50mm.
- A kind of 4. assay method of continuous casting billet central dense degree according to claim 1, it is characterised in that：Sample A and sample B Surface is cleaned using alcohol.
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| CN116699097B (en) * | 2023-07-28 | 2023-10-10 | 北京科技大学 | Nondestructive testing method for solidification structure of high-strength steel for automobile |
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|---|---|---|---|---|
| US3543567A (en) * | 1967-11-20 | 1970-12-01 | Concast Ag | Method of intensifying reflection of ultrasonic waves from boundary between solid and liquid metal |
| CN102721627A (en) * | 2011-03-29 | 2012-10-10 | 厦门钨业股份有限公司 | Method for detecting density of porous material |
| CN103278424A (en) * | 2013-06-07 | 2013-09-04 | 南京钢铁股份有限公司 | Quantitative evaluation method for continuous casting billet center porosity or center shrinkage cavity |
| CN104535388A (en) * | 2014-12-19 | 2015-04-22 | 山东钢铁股份有限公司 | Method for detecting casting blank skin quality |
-
2015
- 2015-11-12 CN CN201510778910.7A patent/CN105403480B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3543567A (en) * | 1967-11-20 | 1970-12-01 | Concast Ag | Method of intensifying reflection of ultrasonic waves from boundary between solid and liquid metal |
| CN102721627A (en) * | 2011-03-29 | 2012-10-10 | 厦门钨业股份有限公司 | Method for detecting density of porous material |
| CN103278424A (en) * | 2013-06-07 | 2013-09-04 | 南京钢铁股份有限公司 | Quantitative evaluation method for continuous casting billet center porosity or center shrinkage cavity |
| CN104535388A (en) * | 2014-12-19 | 2015-04-22 | 山东钢铁股份有限公司 | Method for detecting casting blank skin quality |
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