CN104155161A - Corrosion resistant alloy plate blank dissecting and analyzing method - Google Patents
Corrosion resistant alloy plate blank dissecting and analyzing method Download PDFInfo
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Abstract
The invention belongs to the field of special alloy quality inspection, and relates to a dissecting and analyzing method for testing the internal quality of an electroslag remelting corrosion resistant alloy plate blank. Types of the corrosion resistant alloy plate blank comprise double phase stainless steel, super austenitic stainless steel, Fe-Ni-based corrosion resistant alloy and Ni-based corrosion resistant alloy; the dissecting and analyzing method does not destroy the integrity of the material of the corrosion resistant alloy electroslag plate blank, scientifically and comprehensively analyze the internal quality of the corrosion resisting alloy electroslag plate blank, improves the material the utilization rate to 90%, and greatly saves expensive materials; and detection items include chemical composition segregation, gas content, inclusions, macrostructure (plate blank transverse direction), crystal structure and the like, detection positions comprise the transverse direction and the vertical direction of the plate blank, transverse detection covers the edge of the plate blank to the center area, and vertical detection covers the head and tail areas of the plate blank. The method can comprehensively reflect the internal quality of the corrosion resisting alloy, especially crystal structure crystal angle, and evaluates the rolling performance of the plate blank through crystal orientation analysis.
Description
Technical field
The invention belongs to special alloy quality inspection field.Relate in particular to a kind of dissection and analysis method of checking electroslag remelting corrosion resistant alloy slab internal soundness.
Background technology
Country special steel field " 12 " planning is pointed out, during 12, need key breakthrough high temperature alloy, the contour performance special steel of corrosion-resisting steel critical material technology, formation has high-quality special steel material system and the technological process of production of international most advanced level, obtain a collection of independent intellectual property right, fan out from point to area and promote special steel industry restructuring and optimization and upgrading, significantly promote energy-conserving and emission-cutting technology level, realize high-quality special steel material production domesticization and sizable application.
Up to the present, the corrosion resistant alloy product of supplying on home market is mainly import U.S. International nickel Co. Ltd. Inco. Ltd., and the products such as the corrosion resistant alloy plate that the corrosion resistant alloy slab of particularly take is produced as basis, band, foil are whole dependence on import almost.Therefore, more domestic R&D institutions, steel mill start to strengthen the research of corrosion resistant alloy slab, produce, and in order to evaluate the internal soundness of corrosion resistant alloy slab, need a set of scientific and reasonable method to carry out thoroughly evaluating to its internal soundness.
The production method that discloses a kind of corrosion resistant alloy slab in document " the thick continuous casting steel billet longitudinal crack of N08810 corrosion resistant alloy 200mm forms the analysis of mechanism ", it adopts the explained hereafter of continuous casting to go out the N08810 alloy slab that cross section is 200 mm * 1300 mm.In document " abros electroslag slab ingot technical study with put into practice ", disclose the N08810 alloy electroslag slab ingot production method that a kind of cross section is 350 mm * 1250 mm, it adopts fixed electroslag remelting process, does not all propose the dissection and analysis method of slab.Patent " a kind of method for checking electroslag remelting rectangular slab " discloses a kind of method for checking electroslag remelting rectangular slab, and the specification of slab is 250-960 mm * 1400-2000 mm * L mm, and the method the method exists following not enough:
1, electroslag slab is carried out longitudinally, to cuing open, choosing half as experimental material, slab can only utilize half like this, the utilization factor that is material only has 50%, and the constituent content such as Cr, Ni, Mo, Nb surpasses 30% in corrosion resistant alloy material, expensive, cause great waste of material;
2, in the method, the Interventions Requested of electroslag slab have: four of low power, hardness, chemical composition, gas contents etc., and slab is to be rolled, and the rolling performance of electroslag slab is not tested, Detection of content is comprehensive not.
So, propose a kind of science, comprehensively, corrosion resistant alloy slab dissection and analysis method that stock utilization is high is very necessary, to meet the needs of domestic corrosion resistant alloy slab production technology development, accelerates corrosion resistant alloy slab localization process.
Summary of the invention
The object of this invention is to provide a kind of dissection and analysis method of corrosion resistant alloy electroslag slab, utilize the method, science, comprehensively evaluate the rolling quality of internal soundness, the especially slab of corrosion resistant alloy electroslag slab, the utilization factor of material is increased to 90%.
The invention provides a kind of dissection and analysis method of corrosion resistant alloy electroslag slab, the kind of described corrosion resistant alloy slab is: two phase stainless steel, super austenitic stainless steel, iron abros, abros, the thickness of electroslag slab is 150～200mm, width is 1250～1400mm, and weight is greater than 6 tons;
The concrete steps of described method are:
(1) definition electroslag slab length is that L, width of plate slab are that A, slab thickness are B, along electroslag slab length direction, electroslag slab head, afterbody are respectively amputated to 5% of electroslag remelting plate blank length, as test material, the test sample of electroslag slab head is numbered T, the test sample of electroslag slab afterbody is numbered W, and middle surplus is rolling materials, and stock utilization is 90%;
(2) electroslag slab head test sample T, electroslag slab afterbody test sample W are cut open by the center line of Width respectively, electroslag slab head test sample T is divided into two test samples, be numbered T-1, T-2, electroslag slab afterbody test sample W is divided into two test samples, is numbered W-1, W-2;
(3) apart from the line of sample T-1 length direction end face 5mm place, sample T-1 is cut open along the line, obtain sample T-1 ', apart from the line of sample W-1 length direction end face 5mm place, sample W-1 is cut open along the line, obtain sample W-1 ', sample T-1 ', W-1 ' width are 1/2nd of width of plate slab A, and thickness is slab thickness B, and length is 5mm, respectively to the sample T-1 ' obtaining, W-1 ' carries out plate blank coarse micro-grain fabric analysis, macrostructure sampling meets macrostructure and the defect acid etching method of inspection > > requirement of GB/T 226-1991 < < steel, utilize OLYMPUS GX71 metaloscope, according to the macrostructure of GB/T 226-1991 < < steel and defect acid etching method of inspection > >, analyze, the Solidification Quality of macrostructure Check and Inspection corrosion resistant alloy slab, whether have solidify loose, white band, rimhole, skull patch, white point, axle center intercrystalline crack, air entrapment, non-metallic inclusion and slag inclusion, the defects such as Non-metallic inclusion thing, because electroslag remelting is directional solidification, slab is from the head to afterbody consecutive solidification, and therefore, sampling method is: the total cross-section sample of electroslag slab head, afterbody place xsect, described sampling method can reflect the Solidification Quality of monoblock slab, representative,
(4) will be numbered T-2 test sample, be numbered W-2 test sample, by the center line of thickness direction, cut open respectively, obtain four block check samples; Wherein, two specimen codings of electroslag slab head are respectively T-2-1, T-2-2, and two specimen codings of electroslag slab afterbody are respectively W-2-1, W-2-2; The thickness of sample T-2-1, T-2-2, W-2-1, W-2-2 is 1/2nd of slab thickness B, and width is 1/2nd of width of plate slab A;
(5) be numbered on T-2-1, W-2-1 test sample respectively, apart from sample T-2-1 Width end face 5mm place, ruling, sample T-2-1 is cut open along the line, obtain sample T-2-1-1, apart from sample W-2-1 Width end face 5mm place, ruling, sample W-2-1 is cut open along the line, obtain sample W-2-1-1, sample T-2-1-1, W-2-1-1 thickness are 1/2nd of slab thickness B, and width is 5mm, respectively to the sample T-2-1-1 obtaining, W-2-1-1 carries out crystalline structure analysis, crystalline structure sampling meets macrostructure and the defect acid etching method of inspection > > requirement of GB/T 226-1991 < < steel, utilize OLYMPUS GX71 metaloscope, according to the macrostructure of GB/T 226-1991 < < steel and defect acid etching method of inspection > >, analyze electroslag slab head, the crystalline orientation of afterbody, crystallization angle, evaluate the rolling performance of slab, wherein, crystalline structure can be analyzed the crystallization angle of electroslag slab, and column crystal solidifies direction and the axial angle of slab, and crystallization angle is less than 45 °, and crystalline orientation is more tending towards axially, being more conducive to rolling.By analyzing crystalline structure, can instruct electroslag remelting process to improve, improve the rolling performance of electroslag slab; Because electroslag remelting is directional solidification, slab from the head to afterbody be consecutive solidification, therefore, at electroslag slab head, afterbody place, get respectively crystalline structure sample and analyze, the method can reflect the crystalline orientation of monoblock slab, representative;
(6) rule being numbered on T-2-2 test sample, its through-thickness is equally divided into 2 equal portions, its broad ways is equally divided into 6 equal portions; At the place, point of crossing of mean line, get chip chemistry sample, gas sample, specimen coding is T-2-2-1, T-2-2-2, T-2-2-3, T-2-2-4, T-2-2-5, T-2-2-6, T-2-2-7, the Segregation of Chemical Composition of analysis electroslag slab head and N, H, O content; Rule being numbered on W-2-2 test sample, its through-thickness is equally divided into 2 equal portions, its broad ways is equally divided into 6 equal portions; At the place, point of crossing of mean line, get chip chemistry sample, gas sample, specimen coding is W-2-2-1, W-2-2-2, W-2-2-3, W-2-2-4, W-2-2-5, W-2-2-6, W-2-2-7; The Segregation of Chemical Composition of analysis electroslag slab afterbody and N, H, O content, Segregation of Chemical Composition calculates by following formula:
δ=
In formula
for the massfraction of T-2-2-1, T-2-2-2, T-2-2-3, T-2-2-4, T-2-2-5, T-2-2-6, T-2-2-7, W-2-2-1, W-2-2-2, W-2-2-3, W-2-2-4, W-2-2-5, W-2-2-6, W-2-2-7 sample chemical composition M,
average quality mark for T-2-2-1, T-2-2-2, T-2-2-3, T-2-2-4, T-2-2-5, T-2-2-6, T-2-2-7, W-2-2-1, W-2-2-2, W-2-2-3, W-2-2-4, W-2-2-5, W-2-2-6, W-2-2-7 sample chemical composition M; Wherein, Segregation of Chemical Composition and gas content can detect slab in the homogeneity of process of setting tissue, corrosion resistant alloy contains the easily segregation element such as a large amount of Mo, Ni, Cr, Nb, Ti, easily produce the inhomogeneous of more serious dendritic segregation and tissue, and separate out harmful phase, structural homogenity has a strong impact on the decay resistance of final products, inhales hydrogen, oxygen uptake, suction nitrogen tendency greatly in corrosion resistant alloy process of setting, by analytical chemistry component segregation and gas content analysis, can improve electroslag remelting process.Utilize gas analyzer, carbon and sulfur analytical instrument, plasma emission spectrometer, according to JIS1258-2-2007 < < iron and steel-ICP emission spectrometry method > >, the mensuration > > analytical chemistry composition of carbon sulphur in ASTM E1019-2011 < < iron and steel and fernico, according to mensuration PULSE HEATING inert gas fusion-infrared absorption > > of GB/T 11261-2006 < < iron and steel oxygen content, mensuration inert gas fusion-thermal conductivity (conventional method) the > > of GB/T 20124-2006 < < iron and steel nitrogen content, the mensuration noble gas impulse melting thermal conductivity method > > lab for analysis of gas content of GB/T 222.3-2007 < < iron and steel hydrogen richness, according to solidifying principle, the Segregation of Chemical Composition degree in wide direction of electroslag slab is more serious than thickness direction, therefore, analyzes the Segregation of Chemical Composition on thickness direction, can reflect slab chemical composition homogeneity, chemical composition sampling samples with the sampling standard > > of sample according to HB/Z 205-91 < < steel and high temperature alloy chemical analysis, chemistry sample is chip, chip is pollution-free, non-oxidation, and the diameter of gas content sample is Ф 3mm,
(7) be numbered the width center line of T-2-2 test sample, and rule at mid-depth place, in point of crossing, the sample that length, width and thickness are respectively 15mm, 10mm and 10mm is got at place, specimen coding is T-2-2-8, analyze the inclusion content of electroslag slab head, snotter sampling meets the bioassay standard grading figure microexamination method > > requirement of GB/T 10561-2005 < < nonmetallic inclusionsin steel content; Be numbered the width center line of W-2-2 test sample, and rule at mid-depth place, in point of crossing, the sample that length, width and thickness are respectively 15mm, 10mm and 10mm is got at place, specimen coding is W-2-2-8, analyze the inclusion content of electroslag slab head, snotter sampling meets the bioassay standard grading figure microexamination method > > requirement of GB/T 10561-2005 < < nonmetallic inclusionsin steel content.Utilize OLYMPUS GX71 metaloscope, bioassay standard grading figure microexamination method > > according to GB/T 10561-2005 < < nonmetallic inclusionsin steel content requires the amount of inclusions in electroslag slab, pattern, kind, distribution is analyzed, inclusion content analysis can be checked the degree of purity of corrosion resistant alloy slab, the degree of purity height of electroslag slab can have a strong impact on the decay resistance of product, by analyzing inclusion content, can evaluate the inclusion content height of electroslag slab, snotter pattern, distribute, kind, improve electroslag remelting process.Because electroslag remelting is directional solidification, slab from the head to afterbody be consecutive solidification, therefore, in electroslag slab head, afterbody center, get respectively snotter sample and analyze, the method can reflect the degree of purity of monoblock slab, representative.
Dissection of the present invention, analysis method comparison science, comprehensive, beneficial effect is:
(1) do not destroy the integrality of corrosion resistant alloy electroslag slab material, the internal soundness of corrosion resistant alloy electroslag slab has been carried out to science, multianalysis, the utilization factor of material is increased to 90%, greatly saved expensive material;
(2) project detecting comprises Segregation of Chemical Composition, gas content, snotter, macrostructure (slab is horizontal), crystalline structure etc., the position of detecting comprises the horizontal, longitudinal of slab, laterally detect the Zhi Xinbu region, edge that has covered slab, longitudinally detect head, the tail region that has covered slab, the internal soundness that can comprehensively reflect corrosion resistant alloy, especially crystalline structure crystallization angle, crystalline orientation assay the rolling performance of slab.
Accompanying drawing explanation
Fig. 1, Fig. 2 are that slab head, afterbody sample are dissected schematic diagram;
Fig. 3 is that slab head T sample is dissected schematic diagram;
Fig. 4 is that slab afterbody W sample is dissected schematic diagram;
Fig. 5 is T-1, W-1 sample macrostructure sampling schematic diagram;
Fig. 6 is that slab head T-2 sample is dissected schematic diagram;
Fig. 7 is that slab afterbody W-2-sample is dissected schematic diagram;
Fig. 8 T-2-1, W-2-1 sample crystalline structure sampling schematic diagram;
Fig. 9 slab head T-2-2 sample chemical composition, gas content sampling schematic diagram;
Figure 10 slab afterbody W-2-2 sample chemical composition, gas content sampling schematic diagram;
Figure 11 slab head T-2-2 sample inclusion content sampling schematic diagram;
Figure 12 slab afterbody W-2-2 sample inclusion content sampling schematic diagram.
In figure, L, slab length, A, width of plate slab, B, slab thickness.
Embodiment
Below in conjunction with embodiment, the present invention is described further:
The UNS S32760 two phase stainless steel electroslag remelting plate blank that the present invention is respectively 200mm, 1250mm and 4000mm to thickness, width and length is dissected, is analyzed, the method is equally applicable to the electroslag remelting plate blanks such as other two phase stainless steel, super austenitic stainless steel, iron abros and abros, and concrete grammar is as follows:
(1) as shown in Figure 1 and Figure 2, definition electroslag slab length is that L, width of plate slab are that A, slab thickness are B, along electroslag slab length direction, electroslag slab head, afterbody are respectively amputated to 5% of electroslag remelting plate blank length, as test material, the test sample of electroslag slab head is numbered T, and the test sample of electroslag slab afterbody is numbered W, middle surplus is rolling materials, and stock utilization is 90%;
(2) as shown in Figure 3, Figure 4, electroslag slab head test sample T, electroslag slab afterbody test sample W are cut open by the center line of Width respectively, electroslag slab head test sample T is divided into two test samples, be numbered T-1, T-2, electroslag slab afterbody test sample W is divided into two test samples, is numbered W-1, W-2;
(3) as shown in Figure 5, apart from the line of sample T-1 length direction end face 5mm place, sample T-1 is cut open along the line, obtain sample T-1 ', apart from the line of sample W-1 length direction end face 5mm place, sample W-1 is cut open along the line, obtain sample W-1 ', sample T-1 ', W-1 ' width are 1/2nd of width of plate slab A, and thickness is slab thickness B, and length is 5mm, respectively to the sample T-1 ' obtaining, W-1 ' carries out plate blank coarse micro-grain fabric analysis, macrostructure sampling meets macrostructure and the defect acid etching method of inspection > > requirement of GB/T 226-1991 < < steel, utilize OLYMPUS GX71 metaloscope, according to the macrostructure of GB/T 226-1991 < < steel and defect acid etching method of inspection > >, analyze, the Solidification Quality of macrostructure Check and Inspection corrosion resistant alloy slab, whether have solidify loose, white band, rimhole, skull patch, white point, axle center intercrystalline crack, air entrapment, non-metallic inclusion and slag inclusion, the defects such as Non-metallic inclusion thing, because electroslag remelting is directional solidification, slab is from the head to afterbody consecutive solidification, and therefore, sampling method is: the total cross-section sample of electroslag slab head, afterbody place xsect, described sampling method can reflect the Solidification Quality of monoblock slab, representative,
(4) as shown in Figure 6, Figure 7, will be numbered T-2 test sample, be numbered W-2 test sample, by the center line of thickness direction, cut open respectively, obtain four block check samples; Wherein, two specimen codings of electroslag slab head are respectively T-2-1, T-2-2, and two specimen codings of electroslag slab afterbody are respectively W-2-1, W-2-2; The thickness of sample T-2-1, T-2-2, W-2-1, W-2-2 is 1/2nd of slab thickness B, and width is 1/2nd of width of plate slab A;
(5) as shown in Figure 8, be numbered on T-2-1, W-2-1 test sample respectively, apart from sample T-2-1 Width end face 5mm place, ruling, sample T-2-1 is cut open along the line, obtain sample T-2-1-1, apart from the line of sample W-2-1 Width end face 5mm place, sample W-2-1 is cut open along the line, obtain sample W-2-1-1, sample T-2-1-1, W-2-1-1 thickness are 1/2nd of slab thickness B, and width is 5mm, respectively to the sample T-2-1-1 obtaining, W-2-1-1 carries out crystalline structure analysis, crystalline structure sampling meets macrostructure and the defect acid etching method of inspection > > requirement of GB/T 226-1991 < < steel, utilize OLYMPUS GX71 metaloscope, according to the macrostructure of GB/T 226-1991 < < steel and defect acid etching method of inspection > >, analyze electroslag slab head, the crystalline orientation of afterbody, crystallization angle, evaluate the rolling performance of slab, wherein, crystalline structure can be analyzed the crystallization angle of electroslag slab, and column crystal solidifies direction and the axial angle of slab, and crystallization angle is less than 45 °, and crystalline orientation is more tending towards axially, being more conducive to rolling.By analyzing crystalline structure, can instruct electroslag remelting process to improve, improve the rolling performance of electroslag slab; Because electroslag remelting is directional solidification, slab from the head to afterbody be consecutive solidification, therefore, at electroslag slab head, afterbody place, get respectively crystalline structure sample and analyze, the method can reflect the crystalline orientation of monoblock slab, representative;
(6) as shown in Figure 9, rule being numbered on T-2-2 test sample, its through-thickness is equally divided into 2 equal portions, its broad ways is equally divided into 6 equal portions; At the place, point of crossing of mean line, get chip chemistry sample, gas sample, specimen coding is T-2-2-1, T-2-2-2, T-2-2-3, T-2-2-4, T-2-2-5, T-2-2-6, T-2-2-7, the Segregation of Chemical Composition of analysis electroslag slab head and N, H, O content; As shown in figure 10, rule being numbered on W-2-2 test sample, its through-thickness is equally divided into 2 equal portions, its broad ways is equally divided into 6 equal portions; At the place, point of crossing of mean line, get chip chemistry sample, gas sample, specimen coding is W-2-2-1, W-2-2-2, W-2-2-3, W-2-2-4, W-2-2-5, W-2-2-6, W-2-2-7; The Segregation of Chemical Composition of analysis electroslag slab afterbody and N, H, O content, Segregation of Chemical Composition calculates by following formula:
δ=
In formula
for the massfraction of T-2-2-1, T-2-2-2, T-2-2-3, T-2-2-4, T-2-2-5, T-2-2-6, T-2-2-7, W-2-2-1, W-2-2-2, W-2-2-3, W-2-2-4, W-2-2-5, W-2-2-6, W-2-2-7 sample chemical composition M,
average quality mark for T-2-2-1, T-2-2-2, T-2-2-3, T-2-2-4, T-2-2-5, T-2-2-6, T-2-2-7, W-2-2-1, W-2-2-2, W-2-2-3, W-2-2-4, W-2-2-5, W-2-2-6, W-2-2-7 sample chemical composition M; Wherein, Segregation of Chemical Composition and gas content can detect slab in the homogeneity of process of setting tissue, corrosion resistant alloy contains the easily segregation element such as a large amount of Mo, Ni, Cr, Nb, Ti, easily produce the inhomogeneous of more serious dendritic segregation and tissue, and separate out harmful phase, structural homogenity has a strong impact on the decay resistance of final products, inhales hydrogen, oxygen uptake, suction nitrogen tendency greatly in corrosion resistant alloy process of setting, by analytical chemistry component segregation and gas content analysis, can improve electroslag remelting process.Utilize gas analyzer, carbon and sulfur analytical instrument, plasma emission spectrometer, according to JIS1258-2-2007 < < iron and steel-ICP emission spectrometry method > >, the mensuration > > analytical chemistry composition of carbon sulphur in ASTM E1019-2011 < < iron and steel and fernico, according to mensuration PULSE HEATING inert gas fusion-infrared absorption > > of GB/T 11261-2006 < < iron and steel oxygen content, mensuration inert gas fusion-thermal conductivity (conventional method) the > > of GB/T 20124-2006 < < iron and steel nitrogen content, the mensuration noble gas impulse melting thermal conductivity method > > lab for analysis of gas content of GB/T 222.3-2007 < < iron and steel hydrogen richness, according to solidifying principle, the Segregation of Chemical Composition degree in wide direction of electroslag slab is more serious than thickness direction, therefore, analyzes the Segregation of Chemical Composition on thickness direction, can reflect slab chemical composition homogeneity, chemical composition sampling samples with the sampling standard > > of sample according to HB/Z 205-91 < < steel and high temperature alloy chemical analysis, chemistry sample is chip, chip is pollution-free, non-oxidation, and the diameter of gas content sample is Ф 3mm,
(7) as shown in figure 11, be numbered the width center line of T-2-2 test sample, and rule at mid-depth place, in point of crossing, the sample that length, width and thickness are respectively 15mm, 10mm and 10mm is got at place, specimen coding is T-2-2-8, analyze the inclusion content of electroslag slab head, snotter sampling meets the bioassay standard grading figure microexamination method > > requirement of GB/T 10561-2005 < < nonmetallic inclusionsin steel content; As shown in figure 12, be numbered the width center line of W-2-2 test sample, and rule at mid-depth place, in point of crossing, the sample that length, width and thickness are respectively 15mm, 10mm and 10mm is got at place, specimen coding is W-2-2-8, analyze the inclusion content of electroslag slab head, snotter sampling meets the bioassay standard grading figure microexamination method > > requirement of GB/T 10561-2005 < < nonmetallic inclusionsin steel content.Utilize OLYMPUS GX71 metaloscope, bioassay standard grading figure microexamination method > > according to GB/T 10561-2005 < < nonmetallic inclusionsin steel content requires the amount of inclusions in electroslag slab, pattern, kind, distribution is analyzed, inclusion content analysis can be checked the degree of purity of corrosion resistant alloy slab, the degree of purity height of electroslag slab can have a strong impact on the decay resistance of product, by analyzing inclusion content, can evaluate the inclusion content height of electroslag slab, snotter pattern, distribute, kind, improve electroslag remelting process.Because electroslag remelting is directional solidification, slab from the head to afterbody be consecutive solidification, therefore, in electroslag slab head, afterbody center, get respectively snotter sample and analyze, the method can reflect the degree of purity of monoblock slab, representative.
Claims (1)
1. the dissection and analysis method of a corrosion resistant alloy electroslag slab, the kind of described corrosion resistant alloy slab is: two phase stainless steel, super austenitic stainless steel, iron abros, abros, the thickness of electroslag slab is 150～200mm, width is 1250～1400mm, and weight is greater than 6 tons; It is characterized in that: the concrete steps of described method are:
(1) definition electroslag slab length is that L, width of plate slab are that A, slab thickness are B, along electroslag slab length direction, electroslag slab head, afterbody are respectively amputated to 5% of electroslag remelting plate blank length, as test material, the test sample of electroslag slab head is numbered T, the test sample of electroslag slab afterbody is numbered W, and middle surplus is rolling materials, and stock utilization is 90%;
(2) electroslag slab head test sample T, electroslag slab afterbody test sample W are cut open by the center line of Width respectively, electroslag slab head test sample T is divided into two test samples, be numbered T-1, T-2, electroslag slab afterbody test sample W is divided into two test samples, is numbered W-1, W-2;
(3) apart from the line of sample T-1 length direction end face 5mm place, sample T-1 is cut open along the line, obtain sample T-1 ', apart from the line of sample W-1 length direction end face 5mm place, sample W-1 is cut open along the line, obtain sample W-1 '; Sample T-1 ', W-1 ' width are 1/2nd of width of plate slab A, and thickness is slab thickness B, and length is 5mm; Respectively the sample T-1 ', the W-1 ' that obtain are carried out to plate blank coarse micro-grain fabric analysis, utilize OLYMPUS GX71 metaloscope, according to the macrostructure of GB/T 226-1991 < < steel and defect acid etching method of inspection > >, analyze, whether the Solidification Quality of macrostructure Check and Inspection corrosion resistant alloy slab, have and solidify the defects such as loose, white band, rimhole, skull patch, white point, axle center intercrystalline crack, air entrapment, non-metallic inclusion and slag inclusion, Non-metallic inclusion thing;
(4) will be numbered T-2 test sample, be numbered W-2 test sample, by the center line of thickness direction, cut open respectively, obtain four block check samples; Wherein, two specimen codings of electroslag slab head are respectively T-2-1, T-2-2, and two specimen codings of electroslag slab afterbody are respectively W-2-1, W-2-2; The thickness of sample T-2-1, T-2-2, W-2-1, W-2-2 is 1/2nd of slab thickness B, and width is 1/2nd of width of plate slab A;
(5) be numbered on T-2-1, W-2-1 test sample respectively, apart from sample T-2-1 Width end face 5mm place, ruling, sample T-2-1 is cut open along the line, obtain sample T-2-1-1, apart from sample W-2-1 Width end face 5mm place, ruling, sample W-2-1 is cut open along the line, obtain sample W-2-1-1; Sample T-2-1-1, W-2-1-1 thickness are 1/2nd of slab thickness B, and width is 5mm; Respectively the sample T-2-1-1, the W-2-1-1 that obtain are carried out to crystalline structure analysis, utilize OLYMPUS GX71 metaloscope, according to the macrostructure of GB/T 226-1991 < < steel and defect acid etching method of inspection > >, analyze electroslag slab head, the crystalline orientation of afterbody, crystallization angle, evaluate the rolling performance of slab;
(6) rule being numbered on T-2-2 test sample, its through-thickness is equally divided into 2 equal portions, its broad ways is equally divided into 6 equal portions; At the place, point of crossing of mean line, get chip chemistry sample, gas sample, specimen coding is T-2-2-1, T-2-2-2, T-2-2-3, T-2-2-4, T-2-2-5, T-2-2-6, T-2-2-7, the Segregation of Chemical Composition of analysis electroslag slab head and N, H, O content; Rule being numbered on W-2-2 test sample, its through-thickness is equally divided into 2 equal portions, its broad ways is equally divided into 6 equal portions; At the place, point of crossing of mean line, get chip chemistry sample, gas sample, specimen coding is W-2-2-1, W-2-2-2, W-2-2-3, W-2-2-4, W-2-2-5, W-2-2-6, W-2-2-7; The Segregation of Chemical Composition of analysis electroslag slab afterbody and N, H, O content, Segregation of Chemical Composition calculates by following formula:
δ=
In formula
for the massfraction of T-2-2-1, T-2-2-2, T-2-2-3, T-2-2-4, T-2-2-5, T-2-2-6, T-2-2-7, W-2-2-1, W-2-2-2, W-2-2-3, W-2-2-4, W-2-2-5, W-2-2-6, W-2-2-7 sample chemical composition M,
average quality mark for T-2-2-1, T-2-2-2, T-2-2-3, T-2-2-4, T-2-2-5, T-2-2-6, T-2-2-7, W-2-2-1, W-2-2-2, W-2-2-3, W-2-2-4, W-2-2-5, W-2-2-6, W-2-2-7 sample chemical composition M; utilize gas analyzer, carbon and sulfur analytical instrument, plasma emission spectrometer, according to JIS1258-2-2007 < < iron and steel-ICP emission spectrometry method > >, the mensuration > > analytical chemistry composition of carbon sulphur in ASTM E1019-2011 < < iron and steel and fernico, according to mensuration PULSE HEATING inert gas fusion-infrared absorption > > of GB/T 11261-2006 < < iron and steel oxygen content, mensuration inert gas fusion-thermal conductivity (conventional method) the > > of GB/T 20124-2006 < < iron and steel nitrogen content, the mensuration noble gas impulse melting thermal conductivity method > > lab for analysis of gas content of GB/T 222.3-2007 < < iron and steel hydrogen richness,
(7) be numbered the width center line of T-2-2 test sample, and rule at mid-depth place, in point of crossing, the sample that length, width and thickness are respectively 15mm, 10mm and 10mm is got at place, specimen coding is T-2-2-8, analyze the inclusion content of electroslag slab head, be numbered the width center line of W-2-2 test sample, and rule at mid-depth place, in point of crossing, the sample that length, width and thickness are respectively 15mm, 10mm and 10mm is got at place, specimen coding is W-2-2-8, analyzes the inclusion content of electroslag slab head; Utilize OLYMPUS GX71 metaloscope, according to the bioassay standard grading figure microexamination method > > of GB/T 10561-2005 < < nonmetallic inclusionsin steel content, require the amount of inclusions in electroslag slab, pattern, kind, distribution to analyze.
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