CN109358066A - One kind is for continuous casting steel billet dendrite corrosion reagent and its preparation and application method - Google Patents
One kind is for continuous casting steel billet dendrite corrosion reagent and its preparation and application method Download PDFInfo
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- CN109358066A CN109358066A CN201811236604.0A CN201811236604A CN109358066A CN 109358066 A CN109358066 A CN 109358066A CN 201811236604 A CN201811236604 A CN 201811236604A CN 109358066 A CN109358066 A CN 109358066A
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- continuous casting
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- steel billet
- casting steel
- chloride
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
- G01N2001/2866—Grinding or homogeneising
Abstract
The invention discloses one kind to be used for continuous casting steel billet dendrite corrosion reagent, it is formulated by copper chloride, magnesium chloride, iron chloride, hydrochloric acid, nitric acid, dehydrated alcohol and water, its ingredient composition and ratio are as follows: 0.6~4.0g of copper chloride, 0.6~2.0g of magnesium chloride, 4~10.0g of iron chloride, 0.1~3.5mL of hydrochloric acid, 0.5~3.5mL of nitric acid, dehydrated alcohol 100mL, water 100mL；It compares with the prior art, the beneficial effects of the present invention are: not only can accurately show the internal flaw of continuous casting steel billet, but also the solidified structure of continuous casting steel billet can be clearly displayed, since the solidified structure of slab is related with curing condition, by the solidified structure for examining continuous casting steel billet, equiaxial crystal ratio can be calculated, measure the percentage of various solidified structures, the data such as column crystal angle excursion and dendrite Models For Secondary Dendrite Arm spacing can also be measured, and then speculate its curing condition, by improving curing condition, reduce casting blank defect, improve the quality of continuous casting billet, ease for operation and the features such as pollution is not generated to environment.
Description
Technical field
The invention belongs to continuous casting steel billet low power analytical control technical fields, and in particular to be a kind of for continuous casting steel billet branch
Brilliant corrosion reagent and its preparation and application method.
Background technique
The low power dendrite arm method of inspection in the prior art for steel is to examine in recent years for Optimized Process of CC to slab
It is required that and develop, and be applied to industrial practice the new continuous casting billet macroscopic view weak cold acid corrosion method of inspection, existing traditional inspection
Proved recipe method can not clearly display the solidified structure of slab and accurate since continuous casting steel billet curing condition is not easy to be measured
The defects of ground shows the defect of slab, and traditional method of inspection is covered segregation, crackle, bubble sometimes and is mingled with.
Summary of the invention
In order to solve the above technical problems, the present invention provides and a kind of judges to solidify by examining the solidified structure that shows
Then condition adjusts, changes curing condition, can obtain good solidified structure, reduces defect, improve being used for for slab quality
Continuous casting steel billet dendrite corrosion reagent and its preparation and application method.
To achieve the above object, the technical solution adopted by the present invention is that, one kind being used for continuous casting steel billet dendrite corrosion reagent, by
Copper chloride, magnesium chloride, iron chloride, hydrochloric acid, nitric acid, dehydrated alcohol and water are formulated, ingredient composition and ratio are as follows:
0.6~4.0g of copper chloride, 0.6~2.0g of magnesium chloride, 4~10.0g of iron chloride, 0.1~3.5mL of hydrochloric acid, nitric acid 0.5
~3.5mL, dehydrated alcohol 100mL, water 100mL；
The mass concentration of the hydrochloric acid is 36%~38%, and the mass concentration of the nitric acid is 65%~68%.
100mL water is added in a kind of preparation method for continuous casting steel billet dendrite corrosion reagent, S1. in a reservoir, then according to
0.6~4.0g of secondary addition copper chloride, 0.6~2.0g of magnesium chloride, 4~10.0g of iron chloride, 0.1~3.5mL of hydrochloric acid, nitric acid 0.5~
3.5mL, dehydrated alcohol 100mL；
S2. it stirs evenly and is completely dissolved to solid, after standing and being cooled to room temperature, complete the preparation of corrosion reagent.
A kind of application method for continuous casting steel billet dendrite corrosion reagent, specific step is as follows,
(1), test check face processes: carrying out smooth processing to the inspection face of sample, inspection face is then carried out polishing throwing
Light processing, until surface roughness be Ra=0.1 μm~0.025 μm, i.e. mirror finish.
(2) dendrite Corrosion monitoring: test check is face-up, corrosion reagent is equably poured to erosion on test check face,
Etching time 0.5min~3min when observing inspection face solidified structure and clear defect, carries out water flushing, and wipe at once, does
High-pressure blast dries up inspection face after net.
(3) take a picture and print figure: the inspection face after being corroded with non-contact scanner or Stereo microscope to sample is shone
Phase finally carries out solidified structure evaluation and defect grading, prints figure.
Preferably, when test check face processes, it is sand that the face of inspection, which is carried out process equipment used by sanding and polishing is processed,
Band.
It compares with the prior art, the beneficial effects of the present invention are: not only can accurately show the inside of continuous casting steel billet
Defect, but also the solidified structure of continuous casting steel billet can be clearly displayed, since the solidified structure of slab is related with curing condition,
By examining the solidified structure of continuous casting steel billet, equiaxial crystal ratio can be calculated, the percentage of various solidified structures is measured, can also be surveyed
The data such as column crystal angle excursion and dendrite Models For Secondary Dendrite Arm spacing are measured, and then speculate its curing condition, are solidified by improving
Condition reduces casting blank defect, improves the quality of continuous casting billet, and the present invention has accuracy, ease for operation and do not generate dirt to environment
The features such as dye.
Figure of description
Fig. 1 is that the equiax crystal solidified structure of the lateral section of the embodiment of the present invention one shows figure；
Fig. 2 is that the column crystal deflection of longitudinal section of the embodiment of the present invention two shows figure；
Specific embodiment
Explanation that the present invention will be further explained in the following with reference to the drawings and specific embodiments, but guarantor of the invention is not limited
Protect range.
One kind being used for continuous casting steel billet dendrite corrosion reagent, by copper chloride, magnesium chloride, iron chloride, hydrochloric acid, nitric acid, anhydrous second
Alcohol and water is formulated, ingredient composition and ratio are as follows:
0.6~4.0g of copper chloride, 0.6~2.0g of magnesium chloride, 4~10.0g of iron chloride, 0.1~3.5mL of hydrochloric acid, nitric acid 0.5
~3.5mL, dehydrated alcohol 100mL, water 100mL；
The mass concentration of the hydrochloric acid is 36%~38%, and the mass concentration of the nitric acid is 65%~68%.
A kind of preparation method for continuous casting steel billet dendrite corrosion reagent, it is characterised in that:
S1. 100mL water is added in a reservoir, then sequentially adds 0.6~4.0g of copper chloride, 0.6~2.0g of magnesium chloride, chlorine
Change 4~10.0g of iron, 0.1~3.5mL of hydrochloric acid, 0.5~3.5mL of nitric acid, dehydrated alcohol 100mL；
S2. it stirs evenly and is completely dissolved to solid, after standing and being cooled to room temperature, complete the preparation of corrosion reagent.
Embodiment one, selection steel grade are Q235B, and specification is the rectangular bloom of 380mm × 280mm as sample:
(1), test check face processes: carrying out smooth processing to the inspection face of sample, inspection face is then carried out polishing throwing
Light processing, process equipment used by sanding and polishing is processed are abrasive band, until surface roughness is Ra=0.1 μm~0.025 μm,
That is mirror finish.
(2) dendrite Corrosion monitoring: test check is face-up, corrosion reagent is equably poured to erosion on test check face,
Etching time 0.5min~3min when observing inspection face solidified structure and clear defect, carries out water flushing, and wipe at once, does
High-pressure blast dries up inspection face after net.
(3) take a picture and print figure: the inspection face after being corroded with non-contact scanner or Stereo microscope to sample is shone
Phase finally carries out solidified structure evaluation and defect grading, and equiax crystal solidified structure is shown as shown in Figure 1 after printing figure.
Embodiment two, selection steel grade are Q235B, and the slab that specification is 230mm × 1650mm is as sample, the inspection of (1), sample
It tests face processing: smooth processing is carried out to the inspection face of sample, face then will be examined to carry out sanding and polishing processing, sanding and polishing processing
Used process equipment be abrasive band, until surface roughness be Ra=0.1 μm~0.025 μm, i.e. mirror finish.
(2) dendrite Corrosion monitoring: test check is face-up, corrosion reagent is equably poured to erosion on test check face,
Etching time 0.5min~3min when observing inspection face solidified structure and clear defect, carries out water flushing, and wipe at once, does
High-pressure blast dries up inspection face after net.
(3) take a picture and print figure: the inspection face after being corroded with non-contact scanner or Stereo microscope to sample is shone
Phase finally carries out solidified structure evaluation and defect grading, and column crystal deflection is shown as shown in Figure 2 after printing figure.
And column crystal angle excursion is influenced by molten steel flow speed, molten steel flow speed is faster, column crystal angle excursion
Bigger, people can speculate the flow condition of steel stream according to the angle excursion of measurement column crystal, and then develop suitable leaching
Enter formula mouth of a river shape, insertion depth and side opening size and angle, improves crystallizer liquid core flow field.
And in the inventive solutions, the time that the inspection face of sample is corroded is according to steel grade and test check
The finish of face polishing determines that the high steel grade etching time of general carbon content is short, the low steel grade etching time of carbon content is long；It throws
The finish of light is higher, and etching time is shorter, otherwise the time lengthens, if first time corrosive effect is not so good, can throw again
Light carry out the 2nd, 3 time corrosion, due to corrode below in front corrosion on the basis of carry out, behind etching time than front
Time is short, and etching time is determined according to the speed that the solidified structure in observation inspection face and defect occur when corrosion, when occurring fast
Between it is short, it is long the slow time occur, it is comprehensive for, i.e. the finish of the polishing in test check face is higher, then examines the solidified structure in face
Occur with defect faster, and is polished when the inspection face to sample is polished using abrasive band, sbrasive belt grinding and grinding wheel
Grinding principle is roughly the same, is all to carry out grinding to test check face surface by abrasive grain, still, due to abrasive band and grinding wheel
The design feature of itself and usage mode difference, make sbrasive belt grinding better than wheel grinding, are mainly manifested in:
1, abrasive band is Elastic Contact grinding, and grinding wheel is that hard contact is ground, abrasive belt grinding machine stable accuracy, and grinding wheel grinding machine essence
Degree is easy decline；
2, abrasive grain contour in abrasive band is good, and surface roughness is lower than wheel grinding, highly polished.Sbrasive belt grinding puts into abrasive grain ratio
Grinding wheel is more, and sbrasive belt grinding is more high-efficient than wheel grinding；
3, abrasive band abrasive grain is uniform, contour is good and contact area is small, and grinding heat is few, and heat dissipation is good, and specimen surface state is good,
Do not allow to be also easy to produce burn, there is the good reputation of " cold grinding is cut "；
4, belt sander design is simple, safe and cost-effective honest and clean, and safety accident is few, and is well suited for " intelligence manufacture ", i.e., intelligently
It is mechanical to change transition.
Simultaneously when specifically being operated, be easy to appear excessive erosion and owe corrosion the case where, wherein owe corrode refer to through
The inspection face dendrite tissue of excessive erosion is not clear, can only see the blank of dendrite, does not have embossment sense.The reason of owing corrosion
It is that etching time is inadequate.Solution is to corrode again, is preferably corroded again after polishing again；
And to be that tree Jingjing axis is corroded disconnected for excessive erosion, especially dendrite it is secondary, three times and repeatedly brilliant crystallographic axis compared with
It is easy to be corroded, is molten disconnected.Excessive erosion destroys the style of dendrite tissue, and excessive erosion is erroneously interpreted as equiax crystal group sometimes
It knits.Excessive erosion producing cause is with deficient corrosion on the contrary, being because etching time is too long.Solution is to remove 1mm thickness, then be ground
And polishing, finally corrode again.
And the present invention is in the specific implementation, after making comparison with existing cold acid corrosion, discovery dendrite corrosion display casting
Base solidified structure columnar dendrite is clear, and two para-crystals are, it is apparent that amplification factor can measure two para-crystal arm spacing, and cold sour
Erosion cannot show solidified structure, and solidified structure details is blanked.
It is simultaneously Q345B (0.17%C, 0.36%Si, 1.53%Mn, 0.016%P, 0.002%S) to steel grade, specification is
The same inspection face of the slab of 300mm × 1950mm carries out the center segregation comparison test of B class by dendrite arm corrosion and sulfur print test,
Comparison discovery, the same inspection face, dendrite 1.0 grades of B class center segregation of corrosion, 0.5 grade of center segregation of sulfur print test C class, due to
C, Mn, S and P element can generate segregation, and dendrite, which corrodes these elements, all participates in reaction, and sulfur print test only has 0.002%S's
Sulphur participates in reaction, so sulfur print test covers defect when slab sulfur content is very low.
And dendrite corrosion is passed through to same steel grade, same specification, the same sample for examining face and cold acid corrosion carries out middle crack
Comparison test, after comparison, dendrite corrosion display middle crack, and middle crack defect is covered in cold acid corrosion.
Same steel grade, same specification, the same sample for examining face are carried out respectively by the cold acid corrosion of dendrite burn into and hot acid corrosion
The comparison test of pin hole air blister defect and field trash comparison test, comparison structure discovery, the same inspection face, dendrite corrode pin hole gas
Bubble display is clear, is in white bright circular dot, and needle pore defect is covered in cold acid corrosion and hot acid corrosion；The same inspection face, dendrite are rotten
Erosion display inclusion defect, and inclusion defect is covered in hot and cold acid corrosion erosion.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention, and any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (4)
1. one kind is used for continuous casting steel billet dendrite corrosion reagent, it is characterised in that: by copper chloride, magnesium chloride, iron chloride, hydrochloric acid, nitre
Acid, dehydrated alcohol and water are formulated, ingredient composition and ratio are as follows:
0.6~4.0g of copper chloride, 0.6~2.0g of magnesium chloride, 4~10.0g of iron chloride, 0.1~3.5mL of hydrochloric acid, nitric acid 0.5~
3.5mL, dehydrated alcohol 100mL, water 100mL；
The mass concentration of the hydrochloric acid is 36%~38%, and the mass concentration of the nitric acid is 65%~68%.
2. a kind of preparation method for continuous casting steel billet dendrite corrosion reagent according to claim 1, it is characterised in that:
S1. 100mL water is added in a reservoir, then sequentially adds 0.6~4.0g of copper chloride, 0.6~2.0g of magnesium chloride, iron chloride
4~10.0g, 0.1~3.5mL of hydrochloric acid, 0.5~3.5mL of nitric acid, dehydrated alcohol 100mL；
S2. it stirs evenly and is completely dissolved to solid, after standing and being cooled to room temperature, complete the preparation of corrosion reagent.
3. a kind of application method for continuous casting steel billet dendrite corrosion reagent, it is characterised in that: specific step is as follows,
(1), test check face processes: carrying out smooth processing to the inspection face of sample, then adds inspection face progress sanding and polishing
Work, until surface roughness be Ra=0.1 μm~0.025 μm, i.e. mirror finish.
(2) dendrite Corrosion monitoring: test check is face-up, corrosion reagent is equably poured to erosion on test check face, corrosion
Time 0.5min~3min when observing inspection face solidified structure and clear defect, carries out water flushing, and wipe, after clean at once
High-pressure blast dries up inspection face.
(3) it takes a picture and prints figure: the inspection face photograph after being corroded with non-contact scanner or Stereo microscope to sample, most
Solidified structure evaluation and defect grading are carried out afterwards, print figure.
4. a kind of application method for continuous casting steel billet dendrite corrosion reagent according to claim 3, it is characterised in that: institute
When the test check face processing stated, it is abrasive band that the face of inspection, which is carried out process equipment used by sanding and polishing is processed,.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811236604.0A CN109358066A (en) | 2018-10-23 | 2018-10-23 | One kind is for continuous casting steel billet dendrite corrosion reagent and its preparation and application method |
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| CN201811236604.0A CN109358066A (en) | 2018-10-23 | 2018-10-23 | One kind is for continuous casting steel billet dendrite corrosion reagent and its preparation and application method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118778A (en) * | 2019-05-13 | 2019-08-13 | 中天钢铁集团有限公司 | A kind of medium carbon steel ferrite metallographic etching agent and ferritic structure metallographic phase display method |
| CN111830229A (en) * | 2020-07-12 | 2020-10-27 | 首钢集团有限公司 | Metallographic corrosive agent for primary banded structure of steel and metallographic display method |
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| CN102174699A (en) * | 2010-09-07 | 2011-09-07 | 沈阳东北大学冶金技术研究所有限公司 | Dendritic crystal corrosion macroscopic examination reagent for solidification structures and defects of continuous cast blank and preparation method thereof |
| CN105780005A (en) * | 2016-04-13 | 2016-07-20 | 太原理工大学 | Cold corrosion agent for displaying dendritic structure of 800 H nickel base corrosion resistant alloy and corrosion method |
| CN106596235A (en) * | 2016-12-07 | 2017-04-26 | 东北大学 | Dendritic crystal corroding agent for high nitrogen austenitic stainless steel and preparation method thereof |
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2018
- 2018-10-23 CN CN201811236604.0A patent/CN109358066A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102072908A (en) * | 2010-09-07 | 2011-05-25 | 沈阳东北大学冶金技术研究所有限公司 | Dendrite corrosion low-power checkout integration method |
| CN102174699A (en) * | 2010-09-07 | 2011-09-07 | 沈阳东北大学冶金技术研究所有限公司 | Dendritic crystal corrosion macroscopic examination reagent for solidification structures and defects of continuous cast blank and preparation method thereof |
| CN105780005A (en) * | 2016-04-13 | 2016-07-20 | 太原理工大学 | Cold corrosion agent for displaying dendritic structure of 800 H nickel base corrosion resistant alloy and corrosion method |
| CN106596235A (en) * | 2016-12-07 | 2017-04-26 | 东北大学 | Dendritic crystal corroding agent for high nitrogen austenitic stainless steel and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118778A (en) * | 2019-05-13 | 2019-08-13 | 中天钢铁集团有限公司 | A kind of medium carbon steel ferrite metallographic etching agent and ferritic structure metallographic phase display method |
| CN111830229A (en) * | 2020-07-12 | 2020-10-27 | 首钢集团有限公司 | Metallographic corrosive agent for primary banded structure of steel and metallographic display method |
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Application publication date: 20190219 |