CN103698191A - Aggressive agent for displaying solidification genetic dendritic structure in high-carbon steel plate strip and display method - Google Patents
Aggressive agent for displaying solidification genetic dendritic structure in high-carbon steel plate strip and display method Download PDFInfo
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- CN103698191A CN103698191A CN201310699934.4A CN201310699934A CN103698191A CN 103698191 A CN103698191 A CN 103698191A CN 201310699934 A CN201310699934 A CN 201310699934A CN 103698191 A CN103698191 A CN 103698191A
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Abstract
The invention relates to an aggressive agent for displaying a solidification genetic dendritic structure in a high-carbon steel plate strip and a display method. The aggressive agent comprises the following components: 100ml of distilled water by volume, 5-8g of picric acid by mass and 5-30ml of cleanser essence by mass. The display method comprises the steps of heating and stabilizing the aggressive agent to 60-80 DEG C through a constant-temperature water bath kettle, then putting a prepared sample into the aggressive agent and aggressing for 10-30 seconds, washing the surface of the sample by using ethyl alcohol, and drying, so that the dendritic structure can be observed by using a metallographic microscope. The method has the advantages of being simple to operate and quick to display, and the structure is clear and reliable; through the solidification genetic dendritic structure in the plate strip, a corresponding solidification process condition during continuous casting can be obtained so as to provide technical base for improving plate strip quality and optimizing continuous casting process.
Description
Technical field
The invention belongs to metal lographic examination analysis technical field, relate in particular to a kind of etchant and display packing of solidifying hereditary arborescent structure in high-carbon steel wire rod that show.
Background technology
Continuous casting billet solidified structure and performance situation have larger impact to the tissue of high-carbon steel wire rod and performance.When strand casted from high carbon steel center exists compared with macrosegregation, easily in wire rod, be formed centrally the defects such as network cementite and martensite; When overlapping, defects i.e.cracks appears in continuous casting billet surface, easily on wire rod surface, form and scab, stick up the defects such as skin.If can wire rod is corresponding with the structure property of continuous casting billet, can not only obtain the information such as position of the corresponding continuous casting billet of Defects in Wire Rod, also help the judgement that Defects in Wire Rod forms reason, thereby carry out analysis and the improvement of Defects in Wire Rod.
Present stage, researchers mainly concentrate on to the observation analysis of wire rod tissue aspects such as organizing grain size, network cementite, core martensite, to solidifying the observation analysis of arborescent structure, also only limit on continuous casting billet.Some researchers characterize continuous casting billet center segregation situation by the observation of wire rod banded structure and the measurement of wire rod center carbon content, but these methods can only characterize the performance of continuous casting billet indirectly, can not obtain the true solidified structure situation of continuous casting billet that wire rod is corresponding, also just cannot obtain the curing condition of continuous casting billet, instruct the optimization of continuous casting billet technique.At present, also do not see the method corroding by wire rod and obtain original Patents or the bibliographical information that solidifies arborescent structure of continuous casting billet.
Summary of the invention
The object of the present invention is to provide a kind of etchant and display packing of solidifying hereditary arborescent structure in wire rod that show, mainly for a kind of etchant of high-carbon steel wire rod exploitation, utilize this etchant can clearly show fast wire rod corresponding solidify arborescent structure.
In high-carbon steel wire rod, solidify hereditary arborescent structure etchant by distilled water, picric acid and contain alkyl sodium sulfonate or the liquid detergent of fatty alcohol-ether sodium sulfate surfactant forms, each structural constituent ratio is [in liquor capacity (ml) and quality (g)]: distilled water 100ml: picric acid 5-8g: liquid detergent 5-30ml.
Technical scheme of the present invention is achieved in that
Concrete steps are: 1) preparation etchant: first in the distilled water of 100ml, add the picric acid of 5-8g, stir, then in solution, add the liquid detergent of 5-30ml, keep constant temperature after being heated to 60～85 ℃ by heating water bath pot; 2) prepare sample: on finished product wire rod, intercept sample, by grinder buffing, waterproof abrasive paper, grind and polishing, until sample surfaces is smooth, till obvious cut, then with alcohol, rinse surface, hair-dryer dries up; 3) heat erosion shows: the sample of handling well is put into constant temperature etchant, after 10-30s, take out, by alcohol, rinse specimen surface, dry up.
Continuous casting billet in process of setting solute element easily in interdendritic enrichment and segregation, form dendritic segregation, picric acid solution due to erosional competency a little less than, slowly in erosion process, can demonstrate dendritic segregation, thereby acquisition arborescent structure, due to the result that arborescent structure is continuous casting billet heredity of solidifying in wire rod, therefore adopt picric acid solution also can corrode corresponding arborescent structure.Because picric acid aqueous solution easily produces the corrosion products of one deck indissoluble when the corrosion sample, form adhesive film, cause passivation, formative tissue illusion, cause erosion effect not good, so add the liquid detergent that contains surfactant in etchant, the metallic atom of activation specimen surface, promote the corrosion reaction of sample, improve the display effect of arborescent structure form.Etchant is heated to uniform temperature and keeps constant temperature at thermostat water bath, is that strand arborescent structure can show equably for when improving erosion effect.
The necessity of this invention technology and meaning, be mainly reflected in: 1) can in fast and easy demonstration wire rod, solidify hereditary arborescent structure pattern, thereby can observe and the analytical approachs such as measurement of dendrite interval by dendrite morphology, obtain the curing condition of wire rod continuous casting, carry out the optimization of continuous casting process; 2) can the position features such as wire rod surface imperfection and continuous casting billet bight, limit portion is corresponding, the reason that analyzing defect forms, carries out analysis and the improvement of wire rod surface imperfection.
Accompanying drawing explanation
Fig. 1 is that in embodiment 1, SWRH82B steel wire rod integral body is solidified hereditary arborescent structure pattern;
Fig. 2 be in embodiment 1 in SWRH82B steel wire rod corresponding continuous casting billet corner positions solidify hereditary arborescent structure pattern;
Fig. 3 is the hereditary arborescent structure pattern that solidifies that in embodiment 1, the corresponding continuous casting billet of SWRH82B steel wire rod center is equiax crystal;
Fig. 4 is that in embodiment 2, SWRH82B steel wire rod integral body is solidified hereditary arborescent structure pattern;
Fig. 5 be in embodiment 2 continuous casting billet corner positions both sides corresponding to SWRH82B steel wire rod surface lap defect solidify hereditary arborescent structure pattern;
Fig. 6 is the hereditary arborescent structure pattern that solidifies that in embodiment 2, the corresponding continuous casting billet of SWRH82B steel wire rod center is tiny dendrite;
Embodiment
Embodiment 1
The SWRH82B steel wire rod that the Wei Mou steel mill that the present embodiment is analyzed produces, carbon content is 0.82wt%.
Sample is complete with grinder buffing, on 180#, 400#, 800# and 1000# waterproof abrasive paper, grind successively, then on polishing disk with 2.5 μ m, 1 μ m diamond paste polishing, until sample surfaces is smooth, till obvious cut.After polishing is complete, with alcohol, rinses surface, and by cotton wiping specimen surface spot, then with hair-dryer, dry up.The 5.5g of water seal is analyzed to pure (purity >=99.8%) picric acid and add in 100ml distilled water, then add the white cat board of 10ml liquid detergent, stir.The etchant preparing is put into thermostat water bath, heat and be stabilized in 65 ℃.By ready specimen surface upward, immerse mordant corrosion 13s left and right, observe sample surfaces dimmed after, take out immediately with alcohol and rinse surface, and by cotton wiping specimen surface spot, with hair-dryer, dry up, then sample is put into metaloscope and observe, the results are shown in Figure 1, Fig. 2 and Fig. 3.
Embodiment 2
The SWRH82B steel wire rod (having surface lap defect) that the Wei Mou steel mill that the present embodiment is analyzed produces, carbon content is 0.82wt%
Sample is complete with grinder buffing, on 180#, 400#, 800# and 1000# waterproof abrasive paper, grind successively, then on polishing disk with 2.5 μ m, 1 μ m diamond paste polishing, through sample surfaces is smooth, till obvious cut.After polishing is complete, with alcohol, rinses surface, and by cotton wiping specimen surface spot, then with hair-dryer, dry up.The 7g of water seal is analyzed to pure (purity >=99.8%) picric acid and add in 100ml distilled water, then add the white cat board of 25ml liquid detergent, stir.The etchant preparing is put into thermostat water bath, heat and be stabilized in 72 ℃.By ready specimen surface upward, immerse mordant corrosion 20s left and right, observe sample surfaces dimmed after, take out immediately with alcohol and rinse surface, and by cotton wiping specimen surface spot, with hair-dryer, dry up, then sample is put into metaloscope and observe, the results are shown in Figure 4, Fig. 5 and Fig. 6.
Claims (2)
1. show an etchant that solidifies hereditary arborescent structure in high-carbon steel wire rod, it is characterized in that, the composition of etchant [with liquor capacity (ml), or take quality (g)] as:
Distilled water 100ml: picric acid 5-8g: liquid detergent 5-30ml.
2. with the etchant of claims 1, show in high-carbon steel wire rod and solidify a hereditary arborescent structure method, it is characterized in that comprising the steps:
1) preparation etchant: first add the picric acid of 5-8g in the distilled water of 100ml, stir, then add the liquid detergent of 5-30ml, keep constant temperature after being heated to 60～85 ℃ by heating water bath pot;
2) prepare sample: on finished product wire rod, intercept sample, after grinder buffing, waterproof abrasive paper grinding and polishing, until sample surfaces is smooth, till obvious cut, then with alcohol, rinse surface, with hair-dryer, dry up;
3) heat erosion shows: the sample of handling well is put into constant temperature etchant, after 10-30s, take out, with alcohol, rinse specimen surface, dry up.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977203A (en) * | 2014-04-11 | 2015-10-14 | 鞍钢股份有限公司 | Cold-etching agent displaying dendritic structure form of high-carbon steel continuous casting billet and preparation method |
| CN107389679A (en) * | 2017-06-28 | 2017-11-24 | 江苏省沙钢钢铁研究院有限公司 | The method for determining wire rod surface defect and continuous casting billet correspondence position relation |
| CN108693103A (en) * | 2018-05-29 | 2018-10-23 | 马鞍山钢铁股份有限公司 | A method of corrode for Casting Billet of Highcarbon Steel dendrite and measures |
| CN112881389A (en) * | 2021-01-15 | 2021-06-01 | 本钢板材股份有限公司 | Metallographic detection method for diameter of resistance spot welding nugget area of steel plate |
| CN113884428A (en) * | 2021-09-01 | 2022-01-04 | 石钢京诚装备技术有限公司 | Corrosive agent for bearing steel cast dendritic structure and display method |
| CN113970550A (en) * | 2021-10-26 | 2022-01-25 | 中天钢铁集团有限公司 | Detection method of steel cord wire rod grain boundary cementite |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977203A (en) * | 2014-04-11 | 2015-10-14 | 鞍钢股份有限公司 | Cold-etching agent displaying dendritic structure form of high-carbon steel continuous casting billet and preparation method |
| CN104977203B (en) * | 2014-04-11 | 2017-10-27 | 鞍钢股份有限公司 | A kind of cold erosion agent for showing strand casted from high carbon steel arborescent structure form and preparation method |
| CN107389679A (en) * | 2017-06-28 | 2017-11-24 | 江苏省沙钢钢铁研究院有限公司 | The method for determining wire rod surface defect and continuous casting billet correspondence position relation |
| CN108693103A (en) * | 2018-05-29 | 2018-10-23 | 马鞍山钢铁股份有限公司 | A method of corrode for Casting Billet of Highcarbon Steel dendrite and measures |
| CN108693103B (en) * | 2018-05-29 | 2020-10-02 | 马鞍山钢铁股份有限公司 | Dendritic crystal corrosion and measurement method for high-carbon steel casting blank |
| CN112881389A (en) * | 2021-01-15 | 2021-06-01 | 本钢板材股份有限公司 | Metallographic detection method for diameter of resistance spot welding nugget area of steel plate |
| CN112881389B (en) * | 2021-01-15 | 2023-05-26 | 本钢板材股份有限公司 | Metallographic detection method for diameter of steel plate resistance spot welding nugget region |
| CN113884428A (en) * | 2021-09-01 | 2022-01-04 | 石钢京诚装备技术有限公司 | Corrosive agent for bearing steel cast dendritic structure and display method |
| CN113970550A (en) * | 2021-10-26 | 2022-01-25 | 中天钢铁集团有限公司 | Detection method of steel cord wire rod grain boundary cementite |
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Application publication date: 20140402 |