CN102284685B - Method for anatomical inspection on quality, structure and performance of steel ingot of 70-ton grade to 600-ton grade - Google Patents
Method for anatomical inspection on quality, structure and performance of steel ingot of 70-ton grade to 600-ton grade Download PDFInfo
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- CN102284685B CN102284685B CN2010102023851A CN201010202385A CN102284685B CN 102284685 B CN102284685 B CN 102284685B CN 2010102023851 A CN2010102023851 A CN 2010102023851A CN 201010202385 A CN201010202385 A CN 201010202385A CN 102284685 B CN102284685 B CN 102284685B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/28—Acidic compositions for etching iron group metals
Abstract
The invention relates to a technology of anatomical analysis and research on a steel ingot of higher than 100-ton grade, particularly to a method for anatomical inspection on the quality, structure and performance of a steel ingot of 70-ton grade to 600-ton grade. The method mainly comprises the steps of: the key position and method for steel ingot anatomy, the heat treatment process for a steel ingot test sample, the surface treatment method for a steel ingot detection area, the high-precision analysis and detection method for sulfur distribution, oxygen distribution and phosphorus distribution, the analysis and inspection method for key area chemical constituents, the method for corroding at different concentrations by different corrosive liquids in different stages according to different types of steel, the post-treatment method for the images and results in the analysis and detection area, the analysis method for macrostructures and metallographic images, etc. With the method disclosed by the invention, the detection area surface of the steel ingot can be enabled to satisfy a cold-acid corrosion inspection demand, the solidification structure and macro-casting defects of a large steel ingot can be observed clearly, and the distribution positions of sulfides, oxides and phosphides as well as the segregation distribution condition of sulfur, phosphorus and carbon elements can be accurately determined, thus providing an advantageous basis for improving the solidification structure and eliminating the casting defects.
Description
Technical field
The present invention relates to steel ingot dissection and analysis investigative technique more than hundred tonnes, be specially a kind of 70 tons (t) level to 600 tons (t) level ingot quality and tissue, the property dissection method of inspection.
Background technology
There are the casting flaws such as segregation, crackle, loose, shrinkage cavity, pore, non-metallic inclusion in large-scale steel ingot, and these defectives will have a strong impact on final forging quality.By being carried out dissection and analysis, large-scale steel ingot studies its interior tissue and casting flaw, to instructing steel-making, ingot mould design, casting process parameters optimization etc. to have great directive significance, while can be revised and instruct steel ingot thermal field model, casting flaw criterion and solute segregation model, thereby significantly improves the steel ingot internal soundness.
In recent years, continuous upgrading and improvement along with domestic steelmaking equipment, continuous lifting along with steel ingot preparation technology, domestic 2009 at present, domestic heavy enterprise successfully produces the large-scale steel ingot of 550t (China's two-fold), 580t (a Chinese weight), and tonnage has reached world standard, but only limits to moulding, internal soundness is difficult to guarantee that product percent of pass is low.The process of setting of large-scale steel ingot is very very long (different according to the steel ingot tonnage, reaching tens hours to up to a hundred hours does not wait), solute redistribution is abundant, cause low melting point, the low-density elements such as carbon, phosphorus in the solidification front enrichment, add other physical process, impact such as thermosolutal convection etc. makes steel ingot zones of different uneven chemical components, and final set regional organization is thick.Follow-up Forging Technology and press ability are proposed higher requirement, shrinkage cavity is loose be difficult to forge close, field trash exceeds standard and crackle causes product rejection to happen occasionally, product percent of pass is low.
At home, without any enterprise the as cast condition large-scale steel ingot was carried out complete dissection and analysis in recent years, some iron and steel enterprises only carry out dissection and analysis to rising head and position, the mouth of a river that the steel ingot after forging downcuts, can not capture exactly the internal flaw that has a strong impact on final forging quality.The main cause of failing the as cast condition large-scale steel ingot is carried out complete dissection and analysis is summed up following several aspect: 1) fund input that needs of hundred tonnes of steel ingots is large, and the dissection cycle is long; 2) used to adopt hot acid erosion macroscopic examination method, although the requirement of check surface roughness is low, the corrosive liquid requirement is larger, and corrosive environment is abominable, is difficult to use at hundred tonnes of steel ingots; 3) the check face after the corrosion, outcome record after by the mode of taking a picture check face being corroded in the past, this mode is difficult to hundred tonnes of large check face general corrosion effects are stored.In addition, it is also less in the past steel ingot to be carried out the content of dissection and analysis, can not manifest the inner reason that produces mass defect of large steel ingot fully.
Summary of the invention
Difficult point for dissection and analysis existence in the prior art, the object of the present invention is to provide a kind of 70t level to 600t level ingot quality and tissue, the property dissection method of inspection, the main steel ingot that adopts is dissected key position and method, the ingot pattern Technology for Heating Processing, steel ingot surveyed area surface treatment method, high accuracy sulphur content cloth, oxygen distribution, phosphorus distributional analysis detection method, the key area chemical composition analysis method of inspection, adopt stage by stage variable concentrations caustic solution of different corrosive liquids according to different steel grades, the analyzing and testing area image, post-processing approach as a result, macrostructure and metallic phase image analytical method etc., can be clear, complete documentation large-scale steel ingot macrostructure pattern, can directly observe and judge as cast condition large-scale steel ingot internal soundness defective, provide a kind of simple effectively analytical control method for improving the steel ingot internal soundness.
Technical scheme of the present invention is:
A kind of 70t level is to 600t level ingot quality and tissue, the property dissection method of inspection, comprises that steel ingot dissects key position and method, ingot pattern Technology for Heating Processing, steel ingot surveyed area surface treatment method, high accuracy sulphur content cloth, oxygen distribution, phosphorus distributional analysis detection method, the key area chemical composition analysis method of inspection, adopts different corrosive liquids stage by stage variable concentrations caustic solution, analyzing and testing area image, as a result post-processing approach, macrostructure and metallic phase image analytical method according to different steel grades; Wherein,
(1) steel ingot is dissected key position and method
Behind the steel ingot casting, ingot body surface temperature is carried out the demoulding in 800 ℃-1000 ℃ scope, after the steel ingot demoulding, adopts
Oxygen lance steel ingot carried out short transverse dissect; It is that 200mm-500mm is thick that the dissection process keeps the steel ingot zone, is the centre of steel ingot, and the surface of steel ingot temperature was between 300 ℃-600 ℃ when the steel ingot dissection was finished;
(2) ingot pattern Technology for Heating Processing
Sample after the dissection at 30min with the interior heat-treatment furnace of sending into 300 ± 10 ℃, insulation 5-12h in the time of 300 ± 10 ℃, the programming rate with 20-30 ℃/h after the insulation is warmed up to 600 ℃～630 ℃, carries out the 10-30h insulation under this temperature, with the stove cooling, be cooled to come out of the stove below 100 ℃ after the insulation;
(3) steel ingot surveyed area surface treatment method
Ingot pattern after at first adopting the method for machining to dissect carries out machine and adds, and guarantees last ingot pattern size within 30～100mm, and is the centre of whole steel ingot; Adopt respectively again No. 150, No. 400, No. 600, No. 800, No. 1000 and No. 1200 sand paper are worn away and polished surveyed area, guarantee that surface roughness reaches more than the Ra=0.8 μ m;
(4) adopt stage by stage variable concentrations caustic solution of different corrosive liquids according to different steel grades
Adopting cold acid corrosion liquid is nitric acid, and concentration range is at 10wt%～40wt%, and temperature is 20-40 ℃; Early stage, corrosive acid concentration was larger, adopted the nitric acid of 20%-40% to corrode 1-5min; Later stage corrosive acid concentration is less, adopts the nitric acid of 10%-20% concentration, and corrosion 2-10min carries out the macrostructure check to the steel ingot Examination region.
(5) high accuracy sulphur content cloth, oxygen distribution, phosphorus distributional analysis detection method, the key area chemical composition analysis method of inspection
At first, adopt the low power reflex printing, ingot pattern after excessive erosion, is cleaned through adopting 40 ℃ of-80 ℃ of hot water, and oven dry; Surveyed area is smeared common preparation, and thickness is 0.5-1.5mm, covers 10-15min with printing paper again; Use fixing solution to soak 5-30min, adopt afterwards conventional developing method video picture;
Then, get bits according to steel ingot macrostructure distribution situation at check face, depict whole ingotism situation and macrostructure's corresponding relation; Get bits at steel ingot check face and carry out the element chemistry constituent analysis, adopt
Drill bit get bits, drill through the degree of depth in 10-30mm, each spacing 1-20mm; Carry out elementary analysis by chemical analysis again, depict whole steel ingot C, S, P element segregation situation;
(6) analyzing and testing area image, post-processing approach as a result
Except preserving the printing paper photograph, preserve high-resolution electronic pictures, adopt high-resolution scanner, the scanner of resolution ratio more than 1024 * 768 pixels carries out partial sweep, carries out conventional image after the scanning and processes;
(7) macrostructure and metallic phase image analytical method
Adopt directly measurement or by the metallic phase image process software, scanned picture is carried out graphical analysis.
Described 70t level is to 600t level ingot quality and tissue, the property dissection method of inspection, described step 1) in, the dissection process keeps rising head, ingot body and the tail cone part of steel ingot, perhaps key position is carried out partial analysis.
Described 70t level is to 600t level ingot quality and tissue, the property dissection method of inspection, described step 1) in, the dissection process guarantees the flatness of steel ingot dissection surface less than 100mm, guarantees that simultaneously the cutting heat-affected zone is less than 100mm.
Described 70t level is to 600t level ingot quality and tissue, the property dissection method of inspection, described step 4) in, the fixing solution composition is sodium sulfite 5-15g/L, acetic acid 3-8mL/L, boric acid 5-9g/L, arcanite 10-20g/L, sodium thiosulfate 40-60g/L and water 10-20L.
Described 70t level is to 600t level ingot quality and tissue, the property dissection method of inspection, described step 6) in, will check face macrostructure, casting flaw, field trash to store in the mode of electronic pictures by high resolution scanning equipment.
Described 70t level is to 600t level ingot quality and tissue, the property dissection method of inspection, described step 5) in, for the segregation defective that is line style, to get the bits point and get bits in segregation place, the spacing of getting between the bits point is 2 ± 0.5mm; For wider range segregation defective, the spacing of getting between the bits point at the segregation intersection is 2mm-10mm.
Described 70t level is to 600t level ingot quality and tissue, the property dissection method of inspection, described step 7) in, distinguish technology by the pattern colour difference, for ingot solidification tissue, solidified structure distribution, crystallite dimension, once, secondary or high order dendritic arm spacing carry out quantitative statistics.
The present invention has following beneficial effect:
1,70t level of the present invention is to 600t level ingot quality and tissue, the property dissection method of inspection, adopt steel ingot to dissect key position and method, the ingot pattern Technology for Heating Processing, steel ingot surveyed area surface treatment method, high accuracy sulphur content cloth, oxygen distribution, phosphorus distributional analysis detection method, the key area chemical composition analysis method of inspection, adopt stage by stage variable concentrations caustic solution of different corrosive liquids according to different steel grades, the analyzing and testing area image, post-processing approach as a result, macrostructure and metallic phase image analytical method etc., the utilization of these technical methods can make steel ingot surveyed area surface satisfy cold acid corrosion examination requirements, solidified structure that can clear observation large-scale steel ingot and macroscopical casting flaw are (such as shrinkage cavity, loose, crackle, bubble, field trash, gross segregation etc.), can determine exactly sulfide, oxide, phosphide distributing position and sulphur, phosphorus, carbon segregation distribution situation.Steel ingot is dissected and is detected analytical technology for improving solidified structure, and eliminate casting flaw favourable foundation is provided, be a kind of effective ways that improve ingot quality.
2, the present invention can carry out cold acid corrosion to large-scale steel ingot, is applicable to various steel grades, can adopt different corrosive liquids according to different steel grades, reaches optimum macro-etching effect.
3, the present invention studies its interior tissue and casting flaw by large-scale steel ingot is carried out dissection and analysis, has great directive significance to instructing steel-making, ingot mould design, casting process parameters optimization etc.,
4, the present invention is by carrying out dissection and analysis and can revise and instruct steel ingot thermal field model, casting flaw criterion and solute segregation model to large-scale steel ingot, thereby significantly improves the steel ingot internal soundness.
5, steel ingot of the present invention adopts the high temperature releasing process, carries out high-temperature machining, cracking and avoid producing solid-state phase changes not in the time of can guaranteeing to get ingot pattern.
6, the present invention adopts the sand paper of serial model No. to grind and polishing technology, guarantees that hundred tonnes of steel ingots dissection check roughness reach the requirement of the cold acid etching method of inspection.Use this special polishing mode, steel ingot can be checked face integral surface roughness to reach Ra=0.8 μ m.
7, the present invention adopts the nitric acid of variable concentrations to corrode stage by stage, adopts the cold acid etching method of inspection can greatly reduce the corrosive liquid consumption, processing ease, and corrosive environment improves greatly.
8, the present invention adopts high resolution scanning equipment records macroscopic examination result, can be clear, the experimental results such as complete documentation steel ingot macrostructure's pattern and casting i defective, check face macrostructure, casting flaw, field trash are stored in the mode of electronic pictures.
9, the present invention is perfect carries out the content of dissection and analysis to steel ingot, provides more useful informations for improving the steel ingot internal soundness.
10, the present invention accurately shows segregation element distribution situation in steel ingot, for the segregation defective that is line style, such as A type, V-type segregation, gets the bits point and must get bits in A type, V-type segregation place, and the spacing of getting between the bits point should be less than 2mm.And for wider range segregation defective, such as normal segregation, negative segregation, get at the segregation intersection that distance can be loosened to 2mm-10mm between the bits points, in order to more accurately depict whole ingotism situation.Get bits according to steel ingot macrostructure distribution situation at check face, depict whole ingotism situation and macrostructure's corresponding relation.
Description of drawings
Fig. 1 is 75 tons of steel ingot tail cone tops position views of materialsing.
Fig. 2 is 75 tons of steel ingot tail cone upper sample polish results.
Fig. 3 is that the partial analysis result is dissected on 75 tons of steel ingot tail cone tops.
Fig. 4 is 120 tons of steel ingot rising head bottoms position views of materialsing.
Fig. 5 is that the partial analysis result is dissected in 120 tons of steel ingot rising head bottoms.
The specific embodiment
Embodiment 1
75 tons of steel ingots are dissected check analysis, and the steel ingot material is 12Cr2Mo, and check face size is mainly studied the bottom of 75t steel ingot as shown in Figure 1, and the concrete operation of operation is as follows:
(1) behind the steel ingot casting, ingot body surface temperature is carried out the demoulding in the time of 880 ℃, after the steel ingot demoulding, adopts
Oxygen lance steel ingot carried out short transverse dissect.Final steel ingot sample thickness is 450mm, is the centre of steel ingot, has mainly taked Above The Ingot Bottom, dissects drawing as shown in Figure 1.The dissection process guarantees that the flatness of steel ingot dissection surface is 80mm, guarantees simultaneously the cutting heat-affected zone less than 70mm, and the surface of steel ingot temperature was 310 ℃ when the steel ingot dissection was finished.
(2) with the interior heat-treatment furnace of sending into 300 ℃, insulation 8h in the time of 300 ℃ is incubated rear programming rate with 30 ℃/h and is warmed up to 610 ℃ the sample after the dissection, carries out the 12h insulation, cools off with stove after being incubated, and is cooled to come out of the stove below 90 ℃ at 10min.
(3) adopt ingot pattern after the method for machining will be dissected to carry out machine to steel ingot and add, ingot pattern is of a size of 55mm (thickness) at last, is the centre of steel ingot.Adopt respectively No. 150, No. 400, No. 600, No. 800, No. 1000 and No. 1200 sand paper are worn away and polished surveyed area, surface roughness reaches Ra=0.8 μ m, as shown in Figure 2 again.
(4) adopting concentration is the salpeter solution of 35wt%, temperature is 32 ℃, sample is corroded 5min, after cleaning up, adopting concentration is the nitric acid of 10wt%, and temperature is 32 ℃, sample is corroded 10min, obtain good macrostructure, can be easier to the steel ingot Examination region is carried out the macrostructure check, as shown in Figure 3.
(5) with ingot pattern after excessive erosion, clean through 60 ℃ of hot water, and oven dry.Surveyed area is smeared common preparation, and thickness is 1mm, covers 10min with printing paper again.Use fixing solution (in the present embodiment, the fixing solution composition is sodium sulfite 5g/L, acetic acid 3mL/L, boric acid 9g/L, arcanite 10g/L, sodium thiosulfate 40g/L and water 20L, adopt conventional developing method video picture after soaking 20min, this method can be added up steel ingot check face field trash, segregation element macroscopic view distribution situation more accurately.Simultaneously, adopt
Drill bit get bits, drill through the degree of depth at 15mm, each spacing 5mm.Carry out elementary analysis by chemical analysis again, this method can accurately be depicted whole steel ingot C, S, P element segregation situation.
(6) adopt resolution ratio at the high-resolution scanner of 1024 * 768 pixels, carry out partial sweep, carry out conventional image after the scanning and process.
(7) carry out post processing according to the picture after the scanning, adopt directly measurement or by the metallic phase image process software scanned picture is carried out graphical analysis.Distinguish technology by the pattern colour difference, for ingot solidification tissue, solidified structure distribution, crystallite dimension, once, secondary or high order dendritic arm spacing carry out quantitative statistics.
The result shows, present embodiment can clear, complete documentation large-scale steel ingot macrostructure pattern, can directly observe and judge as cast condition large-scale steel ingot internal soundness defective, provides a kind of simple effectively analytical control method for improving the steel ingot internal soundness.
120 tons of steel ingots are dissected check analysis, and the steel ingot material is 30Cr2Ni4, check face size such as Fig. 4, and the concrete operation of operation is as follows:
(1) ingot body surface temperature is 900 ℃ during the steel ingot demoulding, after the steel ingot demoulding, adopts
Oxygen lance steel ingot carried out short transverse dissect.Final steel ingot sample thickness is 400mm, is the centre of steel ingot, has kept the ingot body part of the downward 500mm of rising head of steel ingot, dissects drawing as shown in Figure 4.The dissection process guarantees that the flatness of steel ingot dissection surface is 60mm, cuts simultaneously the heat-affected zone less than 50mm.The surface of steel ingot temperature was 350 ℃ when the steel ingot dissection was finished.
(2) with the interior heat-treatment furnace of sending into 300 ℃, insulation 9h in the time of 300 ℃ is incubated rear programming rate with 30 ℃/h and is warmed up to 600 ℃ the sample after the dissection, carries out the 10h insulation, cools off with stove after being incubated, and is cooled to come out of the stove below 80 ℃ at 20min.
(3) adopt ingot pattern after the method for machining will be dissected to carry out machine to steel ingot and add, ingot pattern is of a size of 50mm (thickness) at last, is the centre of steel ingot.Adopt respectively No. 150, No. 400, No. 600, No. 800, No. 1000 and No. 1200 sand paper are worn away and polished surveyed area, surface roughness reaches Ra=0.8 μ m again.
(4) adopting concentration is the salpeter solution of 40wt%, temperature is 35 ℃, sample is corroded 3min, after cleaning up, adopting concentration is the nitric acid of 15wt%, and temperature is 35 ℃, sample is corroded 8min, obtain good macrostructure, can be easier to the steel ingot Examination region is carried out the macrostructure check, as shown in Figure 5.
(5) with ingot pattern after excessive erosion, clean through adopting 73 ℃ of hot water, and oven dry.Surveyed area is smeared common preparation, and thickness is 1.5mm, covers 8min with printing paper again.Use fixing solution (in the present embodiment, the fixing solution composition is sodium sulfite 5g/L, acetic acid 3mL/L, boric acid 9g/L, arcanite 10g/L, sodium thiosulfate 60g/L and water 20L, adopt conventional developing method video picture after soaking 30min, this method can be added up steel ingot check face field trash, segregation element macroscopic view distribution situation more accurately.Simultaneously, adopt
Drill bit get bits, drill through the degree of depth at 20mm, each spacing 10mm.Carry out elementary analysis by chemical analysis again, this method can accurately be depicted whole steel ingot C, S, P element segregation situation.
(6) adopt resolution ratio at the high-resolution scanner of 1280 * 800 pixels, carry out partial sweep, carry out conventional image after the scanning and process.
(7) carry out post processing according to the picture after the scanning, adopt directly measurement or by the metallic phase image process software scanned picture is carried out graphical analysis.Distinguish technology by the pattern colour difference, for ingot solidification tissue, solidified structure distribution, crystallite dimension, once, secondary or high order dendritic arm spacing carry out quantitative statistics.
The result shows, present embodiment can clear, complete documentation large-scale steel ingot macrostructure pattern, can directly observe and judge as cast condition large-scale steel ingot internal soundness defective, provides a kind of simple effectively analytical control method for improving the steel ingot internal soundness.
Claims (6)
1. a 70t level is to 600t level ingot quality and tissue, the property dissection method of inspection, it is characterized in that, comprise that steel ingot dissects key position and method, ingot pattern Technology for Heating Processing, steel ingot surveyed area surface treatment method, high accuracy sulphur content cloth, oxygen distribution, phosphorus distributional analysis detection method, the key area chemical composition analysis method of inspection, adopts different corrosive liquids stage by stage variable concentrations caustic solution, analyzing and testing area image, as a result post-processing approach, macrostructure and metallic phase image analytical method according to different steel grades; Wherein,
(1) steel ingot is dissected key position and method
Behind the steel ingot casting, ingot body surface temperature is carried out the demoulding in 800 ℃-1000 ℃ scope, after the steel ingot demoulding, adopts
Oxygen lance steel ingot carried out short transverse dissect; It is that 200mm-500mm is thick that the dissection process keeps the steel ingot zone, and the surface of steel ingot temperature was between 300 ℃-600 ℃ when the steel ingot dissection was finished;
(2) ingot pattern Technology for Heating Processing
Sample after the dissection at 30min with the interior heat-treatment furnace of sending into 300 ± 10 ℃, insulation 5-12h in the time of 300 ± 10 ℃, the programming rate with 20-30 ℃/h after the insulation is warmed up to 600 ℃～630 ℃, carries out the 10-30h insulation under this temperature, with the stove cooling, be cooled to come out of the stove below 100 ℃ after the insulation;
(3) steel ingot surveyed area surface treatment method
Ingot pattern after at first adopting the method for machining to dissect carries out machine and adds, and guarantees last ingot pattern thickness within 30～100mm, and thickness is that the ingot pattern of 30～100mm is the steel ingot surveyed area; Adopt respectively again No. 150, No. 400, No. 600, No. 800, No. 1000 and No. 1200 sand paper are worn away and polished surveyed area, guarantee that surface roughness reaches Ra=0.8 μ m;
(4) adopt stage by stage variable concentrations caustic solution of different corrosive liquids according to different steel grades
Adopting cold acid corrosion liquid is nitric acid, and concentration range is at 10wt%～40wt%, and temperature is 20-40 ℃; Early stage, corrosive acid concentration was larger, adopted the nitric acid of 20%-40% to corrode 1-5min; Later stage corrosive acid concentration is less, adopts the nitric acid of 10%-20% concentration, and corrosion 2-10min carries out the macrostructure check to the steel ingot Examination region;
(5) sulphur content cloth, oxygen distribution, phosphorus distributional analysis detection method, the key area chemical composition analysis method of inspection
At first, adopt the low power reflex printing, described low power reflex printing is: ingot pattern after excessive erosion, is cleaned through adopting 40 ℃ of-80 ℃ of hot water, and oven dry; Surveyed area is smeared common preparation, and thickness is 0.5-1.5mm, covers 10-15min with printing paper again; Use fixing solution to soak 5-30min, adopt afterwards conventional developing method video picture;
Then, get bits according to steel ingot macrostructure distribution situation at check face, depict whole ingotism situation and macrostructure's corresponding relation; Get bits at steel ingot check face and carry out the element chemistry constituent analysis, adopt
Drill bit get bits, drill through the degree of depth in 10-30mm, each spacing 1-20mm; Carry out elementary analysis by chemical analysis again, depict whole steel ingot C, S, P element segregation situation;
(6) analyzing and testing area image, post-processing approach as a result
Except preserving the printing paper photograph, preserve electronic pictures, adopt the scanner of resolution ratio more than 1024 * 768 pixels to carry out partial sweep, carry out conventional image after the scanning and process;
(7) macrostructure and metallic phase image analytical method
Adopt directly measurement or by the metallic phase image process software, scanned picture is carried out graphical analysis.
According to 70t level claimed in claim 1 to 600t level ingot quality and tissue, the property dissection method of inspection, it is characterized in that, described step 1) in, the dissection process guarantees the flatness of steel ingot dissection surface less than 100mm, guarantees that simultaneously the cutting heat-affected zone is less than 100mm.
According to 70t level claimed in claim 1 to 600t level ingot quality and tissue, the property dissection method of inspection, it is characterized in that, described step 5) in, the fixing solution composition is sodium sulfite 5-15g/L, acetic acid 3-8mL/L, boric acid 5-9g/L, arcanite 10-20g/L, sodium thiosulfate 40-60g/L and water 10-20L.
According to 70t level claimed in claim 1 to 600t level ingot quality and tissue, the property dissection method of inspection, it is characterized in that, described step 6) in, will check face macrostructure, casting flaw, field trash to store in the mode of electronic pictures by scanning device.
According to 70t level claimed in claim 1 to 600t level ingot quality and tissue, the property dissection method of inspection, it is characterized in that described step 5) in, for the segregation defective that is line style, get the bits point and get bits in segregation place, the spacing of getting between the bits point is 2 ± 0.5mm; For wider range segregation defective, the spacing of getting between the bits point at the segregation intersection is 2mm-10mm.
According to 70t level claimed in claim 1 to 600t level ingot quality and tissue, the property dissection method of inspection, it is characterized in that, described step 7) in, distinguish technology by the pattern colour difference, for ingot solidification tissue, solidified structure distribution, crystallite dimension, once, secondary or high order dendritic arm spacing carry out quantitative statistics.
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| CN102749431A (en) * | 2012-07-06 | 2012-10-24 | 南阳汉冶特钢有限公司 | Detection method for internal quality of large steel ingots |
| CN103308725A (en) * | 2013-06-04 | 2013-09-18 | 首钢总公司 | Method of analyzing dendritic segregation in low-carbon high-manganese steel continuously-cast billets |
| CN104677714B (en) * | 2013-11-30 | 2017-12-05 | 中国科学院金属研究所 | The macrostructure of steel and defect etching reagent and detection method |
| CN111024741B (en) * | 2019-12-12 | 2023-03-17 | 首钢集团有限公司 | Method for measuring dendrite spacing of chalcogenide free-cutting steel continuous casting billet |
| CN115436083A (en) * | 2020-12-08 | 2022-12-06 | 苏州热工研究院有限公司 | Sampling method for evaluating manufacturing process of pump shaft forging |
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