CN104152709B - A kind of thickness is less than the non-corrosive metal electroslag remelting plate blank production technology and equipments of 200mm - Google Patents
A kind of thickness is less than the non-corrosive metal electroslag remelting plate blank production technology and equipments of 200mm Download PDFInfo
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Abstract
The invention belongs to special alloy field shaping technique.Relate to the non-corrosive metal electroslag remelting plate blank production technology and equipments that a kind of thickness is less than 200mm, the thickness of electrode in described equipment, width and length are respectively: 220-270mm, 1320-1460mm and 2800-3500mm; Thickness of electrode, width are greater than produced electroslag remelting plate blank width 70mm; Crystallizer is the T-shaped crystallizer that under upper crystallizer (10), crystallizer (12) is formed, and upper crystallizer (10) sectional dimension is greater than lower crystallizer (12); After electrode (2) and upper crystallizer (10) centering, on electrode distance, the distance of crystallizer (10) inwall is greater than 50mm, and dummy device (4) includes Dummy plate (15), end water tank (6), dummy ingot pipe (13), dummy ingot transverse tube (18) and " U " type dummy ingot part (17).The non-corrosive metal electroslag remelting plate blank thickness produced is less than 200mm, and width is greater than 1250mm.
Description
Technical field
The invention belongs to special alloy field shaping technique.Particularly relate to the non-corrosive metal electroslag remelting plate blank production technology and equipments that a kind of thickness is less than 200mm.
Background technology
The non-corrosive metal product that domestic market is supplied mainly International nickel Co. Ltd. Inco. Ltd. of the import U.S., the product such as non-corrosive metal plate, band, foil particularly produced based on non-corrosive metal slab is whole dependence on import almost.Country special steel field " 12 " planning is pointed out, " 12 " period needs key breakthrough superalloy, corrosion-resisting steel contour performance special steel critical material technology, form high-quality special steel material system and the technological process of production with 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 domestic material and sizable application.
At present, the forming method of special steel slab mainly adopts fixed esr mode, stripping formula esr mode and continuous casting mode to produce.
The units such as Baosteel special steel company limited, Thyssen Krupp, special steel company of the U.S., ATI company of the U.S. all adopt fixed esr mode to produce non-corrosive metal slab, the specification of electroslag remelting plate blank is 350mm × 1250mm × 2000mm, nearly weigh 7 tons, first below slab is thick to 200mm from the thick cogging of 350mm, then the slab that 200mm is thick just can enter Steckel mill and be rolled into non-corrosive metal hot rolled coil, finally by products such as cold rolling for hot rolled coil one-tenth band, paper tinsels.The technological merit of the program is: 1. the specification of consumable electrode is 250 × 1150 × 3000mm, and electrode length is short, realization easy to manufacture, and esr process easily realizes, and technology stability is good; 2. can control different molten fast-growings and produce high alloy content non-corrosive metal slab, the burn-off rate Surface Quality impact of fixed electroslag remelting process is little, and burn-off rate is comparatively large on solidified structure impact, and burn-off rate is lower, and solidified structure is better.Therefore, low burn-off rate can be adopted to obtain surface quality and all good non-corrosive metal electroslag remelting plate blank of solidified structure.The technical disadvantages of the program is: 1. slab is too thick, and need thick to 200mm for slab hammer cogging thick for 350mm, carry out subsequent hot rolled again after figuring of surface, production process is long, increases cogging, reconditioning operation, and production cost increases, and energy consumption increases, 2. can not produce thickness and be less than 200mm, width is greater than 1250mm, the slab that weight is greater than 6 tons, reason is: conventional fixed-type crystallizer for electroslag refusion is rectangle, because fixed electroslag remelting process must ensure that the distance of consumable electrode distance crystallizer wall is greater than 50mm, that is, to production cross-sectional dimensions be the electroslag remelting plate blank of A × B, required consumable electrode cross-sectional dimensions is (A-100) × (B-100), be so limited, produce 200mm(thick) × 1250mm(is wide) × 3000mm(is long), the slab that weight is about 6 tons, the specification of electrode is: 100mm(is thick) × 1150(is wide) mm × 6500mm(is long), because electrode is oversize, cause electrode manufacture, the problems such as electroslag device fabrication cannot solve, therefore, current state, inside and outside all do not adopt fixed electroslag remelting process produce thickness be less than 200mm, width is greater than 1250mm, the electroslag remelting plate blank that weight is greater than 6 tons.
Disclose a kind of slab production method in document " exploration and practice of E Gang 20t plate blank electroslag furnace power supply system ", it adopts T-shaped crystallizer stripping esr mode production specification to be the low alloy steel of 320mm × 1400mm × 3700mm, 320mm × 1850mm × 3900mm.The technological merit of the program by: 1. adopt sectional dimension to be greater than the electrode of productions electroslag remelting plate blank, by the contraction in length of consumable electrode, the easily realization such as production, planeness, device fabrication of electrode; 2. the feature of stripping electroslag remelting process is: burn-off rate is higher, and the surface quality of electroslag remelting plate blank is better, and the quality of solidified structure is poorer, can produce segregation, solidify the defects such as loose.Because the solidified structure quality influence of burn-off rate to low alloy steel is less, therefore, high molten speed (melting the about high 40-50% of speed than fixed esr) production surface quality can be adopted, heavy slab that solidified inside organizes all good more than thickness 300mm.The shortcoming of the program is: the low-alloy slab 1. produced, and still needs to be first the slab that the slab cogging of 320mm becomes below 200mm by thickness, just can enter Steckel mill and be rolled into hot rolled coil after figuring of surface, production process is long, increase cogging, reconditioning operation, production cost increases, and energy consumption increases; The non-corrosive metal slab that 2. cannot realize the thick above high alloy content of 300mm is produced, reason is: the alloying element content of (a) non-corrosive metal is far away higher than low alloy steel, in process of setting, element segregation is serious, the thickness of slab be increased to 300mm thick more than, the chemical composition lack of homogeneity of slab, affects the corrosion resistance nature of the finished product; B the heat conductivility of () non-corrosive metal is far below low alloy steel, coagulating property is poor, slab thickness be increased to 300mm thick more than, metal freezing speed is lower than steel alloy, can produce the defects such as heart portion microporosity, microshrinkage, thick equiax crystal region, heart portion is large, and the thermoplasticity of slab is poor; 3. the high temperature viscosity of non-corrosive metal is higher than low alloy steel, and poor fluidity easily forms dreg defect.Therefore, current state, inside and outside have no and utilize the method for stripping esr to produce the non-corrosive metal slab of high alloy content.
A kind of production method of non-corrosive metal slab is disclosed, its adopt the explained hereafter of continuous casting to go out N08810 alloy slab that cross section is 200mm × 1300mm in document " analysis of N08810 non-corrosive metal 200mm thick continuous casting steel billet longitudinal crack formation mechenism ".The technological merit of the program is: save cogging, reconditioning operation, direct continuous casting, hot rolling one-heating forming, and production cost reduces, and saves energy consumption.The technical disadvantages of the program is: 1. the purity of continuous casting steel billet is high less than electroslag remelting plate blank, and corrosion resistance nature, homogeneity of ingredients etc. are all not so good as electroslag remelting plate blank, affects use properties; 2. high, the production capacity of production efficiency large (generally once producing more than 150 tons), is not suitable with the market characteristics of the many specifications of non-corrosive metal product, short run.Therefore, current home and abroad does not realize non-corrosive metal sheet billet continuous casting suitability for industrialized production.
Therefore, need to produce thickness and be less than 200mm, width is greater than 1250mm, the non-corrosive metal electroslag remelting plate blank that weight is greater than 6 tons, slab is made directly to enter Steckel mill hot rolling rolling, hammer cogging operation in the middle of saving, production cost reduces, and energy consumption reduces, the high purity of sheet material, corrosion resistance nature improves, and realizes the small serial production of less than 10 tons, adapts to the market characteristics.
Summary of the invention
The object of the invention is to propose the non-corrosive metal electroslag remelting plate blank production technology and equipments that a kind of thickness is less than 200mm, realize thickness and be less than 200mm, width is greater than 1250mm, the non-corrosive metal electroslag remelting plate blank production that weight is greater than 6 tons, this electroslag remelting plate blank directly can enter Steckel mill hot rolling rolling, hammer cogging operation in the middle of saving, shorten the Production Flow Chart of non-corrosive metal plate, band, foil, reduce production cost, reduce energy consumption reduce, meet non-corrosive metal plate, band, foil batch little, produce the market characteristics flexibly.
The present invention adopts lower technical scheme: the kind of described non-corrosive metal comprises duplex stainless steel, super austenitic stainless steel, iron abros, abros etc.; Described non-corrosive metal electroslag remelting plate blank thickness is less than 200mm, and width is greater than 1250mm; The stripping esr equipment that the present invention adopts includes electrode lifting mechanism, electrode, crystallizer, detector, dummy device, stripping system, end water tank, Controlling System; Acting as of described hoisting appliance: will insert in T-shaped crystallizer after electrode firm grip, transmission from top to bottom; Acting as of described electrode: be again frozen into electroslag remelting plate blank after electrode melting in crystallizer, thickness, the width of described electrode are respectively: 220-270mm, 1320-1460mm, and the size of length direction is determined by the weight of electrode; Electrode weight is greater than 6 tons, the feature of electrode is thickness of electrode, width is greater than and is produced electroslag remelting plate blank width 70mm, the length of electrode is less than the length of produced electroslag remelting plate blank, the method of electrode specification design is: on the one hand, electrode inserts the upper crystallizer of T-shaped crystallizer, thickness, the width of upper crystallizer internal cavity are respectively 330-390mm, 1480-1560mm, and the thickness of electrode, width dimensions are minimum apart from the safe distance of crystallizer wall is 50mm; On the other hand, in esr process, from crystallizer wall to center, the temperature of liquid slag bath is increased to 1900 DEG C from 1250 DEG C, raise gradually, the temperature at crystallizer wall place is lower, the solid slag skin thickness solidified is larger, the surface quality of slab is poorer, the melting range of selected slag system is 1200-1250 DEG C, the thickness of electrode cross-section, width dimensions are greater than thickness, the width dimensions 70mm of produced slab cross-section, can ensure that the temperature of crystallizer wall surrounding is at 1250-1280 DEG C, forms good Surface Quality of Steel Billet; From the viewpoint of above two, thickness, the width of electrode are respectively: 220-270mm, 1320-1460mm, and the size of length direction is determined by the weight of electrode; The present invention adopts T-shaped crystallizer, and described crystallizer comprises crystallizer and lower crystallizer; Upper crystallizer sectional dimension is greater than lower crystallizer; Acting as of described T-shaped crystallizer: electrode inserts the upper crystallizer of T-shaped crystallizer, electrode is after upper crystallizer fusing, and molten drop drips to lower crystallizer and forms metal pool, and metal pool, under the cooling conditions of crystallizer water coolant, is frozen into electroslag slab; After the dimensions of upper crystallizer mainly considers electrode and crystallizer centering, on electrode distance, the distance of crystallizer inwall is greater than 50mm, and thick, the wide size of electrode be greater than thick, the wide size 70mm of production ESR ingot; The specification of lower crystallizer mainly considers the specification of non-corrosive metal slab, and non-corrosive metal solidify after can produce the shrinkage of 3-4mm; Therefore, thickness, the width of upper crystallizer internal cavity are respectively 330-390mm, 1480-1560mm, upper crystallizer height 400mm; Lower crystallizer internal cavity is of a size of 158-208mm × 1258-1408mm, lower crystallizer height 400mm; Can shrink 3-4mm because slab solidifies after rear each face is solidified, upper crystallizer tranverse sectional thickness, width dimensions are greater than electrode cross-section thickness, width dimensions at least 50mm, ensure electrode do not encounter in decline process on crystallizer wall; Described dummy device includes Dummy plate and end water tank; Described Dummy plate is square steel plate, and the Dummy plate described in two is symmetricly set on water tank upper surface, end arranged on left and right sides, and described Dummy plate has center hole, and the outside dimension of Circularhole diameter and dummy ingot pipe etc. are large; Be provided with dummy ingot pipe, described dummy ingot pipe is hollow structure, be communicated with by dummy ingot transverse tube after the dummy ingot pipe described in two be communicated with cooling water system is each passed through end water tank arranged on left and right sides, form cooling water channel, described dummy ingot transverse tube distance water tank upper surface, end 35-45mm is high, and described dummy ingot transverse tube forms adhesive spots; Dummy ingot pipe described in two, through the center hole of corresponding Dummy plate, is fixed by sustained ring and two Dummy plates; The outside, lower end of described dummy ingot pipe is helicitic texture, makes Dummy plate, dummy ingot pipe relative with the position of end water tank fixing by fitting nut; Described sustained ring is positioned at the upper surface of described Dummy plate and is enclosed within described dummy ingot pipe, and sustained ring and Dummy plate, dummy ingot pipe are welded to connect; At the upper surface of described dummy ingot pipe welding " U " type dummy ingot part, described " U " type dummy ingot part is steel construction piece, water tank upper surface 50-55mm at the bottom of its apogee distance, and described " U " type dummy ingot part forms adhesive spots.
Hoisting appliance in stripping esr equipment, stripping mechanism, end water tank and Controlling System etc. adopt the structure of existing stripping esr equipment.
For the feature of duplex stainless steel, iron abros, abros, select corresponding electrode melting speed, cooling system, achieve thickness and be less than 200mm, width is greater than 1250mm, the non-corrosive metal slab production that weight is greater than 6 tons.
The non-corrosive metal electroslag remelting plate blank distinguishing feature utilizing described method and apparatus to produce is: 1. smooth surface, without the problem such as pit, ripple; 2. without solidifying the defects such as loose, slag inclusion, crystalline orientation and axial angle are less than 45 °, and heart portion is without thick equiax crystal district, and slab has good hot-workability; 3. electroslag remelting plate blank directly can enter Steckel mill hot rolling rolling, saves middle hammer cogging operation, and production cost reduces, and energy consumption reduces, and adapt to the non-corrosive metal strip market characteristics, have obvious economic benefit, the market competitiveness improves.
The stripping electroslag remelting process that the present invention adopts comprises the following steps:
1), intermediate frequency furnace+AOD furnace refinery practice is adopted to produce duplex stainless steel, super austenitic stainless steel, iron abros, abros electrode, electrode specification is 220-270mm × 1320-1460mm × 2800-3500mm, electrode weight is greater than 6 tons, consumable electrode is welded on dummy electrode, stand-by;
2), by slag charge at the temperature of 800-850 DEG C, toast 7-8 hour, reduce the moisture content in slag charge, stand-by;
3), adopt Graphite Electrodes, in change cinder ladle, ready slag charge is fused into liquid state, liquid slag temperature controls at 1650-1700 DEG C;
4), by dummy device connect firmly with end water tank, then end water tank is moved in lower crystallizer, by good for the gap seals of end water tank and lower crystallizer surrounding, after consumable electrode and crystallizer centering, be raised up to crystallizer mouth;
5), close the water coolant of dummy device, liquid slag is poured in T-shaped crystallizer;
6), consumable electrode is inserted in the upper crystallizer of T-shaped crystallizer, adjust the voltage of equipment, electric current, electrode insertion depth controls at 15-20mm, the burn-off rate of electrode controls at 900-1300kg/h, molten drop is dropped on dummy device, the water coolant of dummy device is opened, metal pool is firmly set on dummy device;
7), metal pool liquid level adopts detector to judge, when the liquid level of metal pool reaches apart from lower crystallizer base 300-380mm height, start to twitch end water tank, steel ingot is pulled out from crystallizer, the speed of twitching is 1-13mm/min, always that comsumable melt is complete; The cooling water flow of upper crystallizer controls at 80-90m
3/ h, the cooling water flow of lower crystallizer controls at 130-150m
3/ h, end water tank cooling water flow controls at 20-30m
3/ h, the cooling water flow of dummy device controls at 10-20m
3/ h;
8), according to need of production, an other consumable electrode is moved in slag bath again, realizes continuous seepage.
The non-corrosive metal electroslag remelting plate blank cross-sectional dimensions produced is that 150-200mm(is thick) × 1250-1400mm(is wide), weight is greater than 6 tons, and electroslag remelting plate blank does not need to carry out hammer cogging operation, directly can enter Steckel mill hot rolling rolling.
Non-corrosive metal slab electroslag remelting process of the present invention and stripping esr equipment, successfully produce internal soundness and the good thickness of surface quality is 150-200mm, width is 1250-1400mm, the duplex stainless steel that weight is greater than 6 tons, super austenitic stainless steel, iron abros, the electroslag remelting plate blanks such as abros, this slab directly can enter Steckel mill hot rolling and become a useful person, reduce production cost, reduce energy consumption, improve production efficiency, adapt to the non-corrosive metal strip market characteristics, small serial production can be carried out, this technology has obvious economic benefit, fill up state, the inside and outside blank in this field.
Accompanying drawing explanation
Fig. 1 is slab stripping esr equipment schematic diagram.
Fig. 2 is T-shaped crystallizer schematic diagram.
Fig. 3 is dummy device schematic diagram.
In figure, 1, hoisting appliance, 2, electrode, 3, T-shaped crystallizer, 4, dummy device, 5, stripping mechanism, 6, end water tank, 7, slab, 8, Controlling System, 9, liquid slag bath, 10, upper crystallizer, 11, detector, 12, lower crystallizer, 13, dummy ingot pipe, 14, nut, 15, Dummy plate, 16, support ring, 17, " U " type dummy ingot part, 18, dummy ingot transverse tube.
Embodiment
In conjunction with the embodiment provided, the present invention is illustrated:
In following embodiment, adopt T-shaped crystallizer 3, composition graphs 2, described T-shaped crystallizer 3 comprises crystallizer 10 and lower crystallizer 12; Upper crystallizer 10 sectional dimension is greater than lower crystallizer 12; Thickness, the width of upper crystallizer 10 inner chamber are respectively 330-390mm, 1480-1560mm, upper crystallizer height 400mm; Lower crystallizer 12 inner cavity size is 158-208mm × 1258-1408mm, the high 400mm of lower crystallizer 12; Composition graphs 3, dummy device includes Dummy plate 15 and end water tank 6; Described Dummy plate 15 is square steel plate, and the Dummy plate 15 described in two is symmetricly set on water tank upper surface, end arranged on left and right sides, and described Dummy plate 15 has center hole, and the outside dimension of Circularhole diameter and dummy ingot pipe 13 etc. are large; Be provided with dummy ingot pipe 13, described dummy ingot pipe 13 is hollow structure, be communicated with by dummy ingot transverse tube 18 after the dummy ingot pipe 13 described in two be communicated with cooling water system is each passed through end water tank arranged on left and right sides, form cooling water channel, described dummy ingot transverse tube 18 is high apart from water tank upper surface, end 35-45mm, and described dummy ingot transverse tube 18 forms adhesive spots; Dummy ingot pipe 13 described in two, through the center hole of corresponding Dummy plate, is fixed by sustained ring 16 and two Dummy plates 15; The outside, lower end of described dummy ingot pipe 13 is helicitic texture, makes Dummy plate 15, dummy ingot pipe 13 relative with the position of end water tank fixing by nut 14; Described sustained ring 16 is positioned at the upper surface of described Dummy plate and is enclosed within described dummy ingot pipe 13, and sustained ring 16 and Dummy plate 15, dummy ingot pipe 13 are welded to connect; At the upper surface of described dummy ingot pipe 13 welding " U " type dummy ingot part 17, described " U " type dummy ingot part 17 is steel construction piece, water tank upper surface 50-55mm at the bottom of its apogee distance, and described " U " type dummy ingot part 17 forms adhesive spots.Hoisting appliance in stripping esr equipment, stripping mechanism, end water tank and Controlling System etc. adopt the structure of existing stripping esr equipment.
Embodiment 1: manufacture UNSS32760 two-phase stainless plate slab.
The first step, employing " intermediate frequency furnace+AOD furnace " technique smelt consumable electrode, and electrode specification is that 270mm(is thick) × 1320mm(is wide) × 2800mm(is long), the chemical composition conformance with standard requirement of electrode, as shown in table 1.
Table 1 electrode chemical composition (% by weight)
| Element | C | Si | Mn | S | P | Cr |
| Electrode | 0.025 | 0.215 | 0.641 | 0.01 | 0.01 | 25.18 |
| Standard | ≤0.030 | ≤1.0 | ≤1.0 | ≤0.01 | ≤0.03 | 24-26 |
| Element | Ni | Mo | Cu | N | W | |
| Electrode | 7.03 | 3.75 | 0.742 | 0.253 | 0.667 | |
| Standard | 6-8 | 3-4 | 0.5-1.0 | 0.2-0.3 | 0.5-1.0 |
Second step, by clean for consumable electrode surface finish.
3rd step, prepare slag charge.Slag system adopts CaF
2, Al
2o
3, CaO, MgO, SiO
2five yuan of slag systems, the weight percent of each constituent element is respectively 32%, 31%, 27%, 6%, 4%, quantity of slag 300kg; Separately inserted in electric furnace by slag charge, temperature controls at 850 DEG C, toasts 8 hours.
4th step, by baked slag system according to CaF
2, MgO, SiO
2, CaO, Al
2o
3joining of order cinder ladle in, striking slag making, change about 90 minutes slag time, slag temperature control, at 1650-1700 DEG C, ensures that slag system melts, changes clearly;
5th step, dummy device 4 to be connected firmly with end water tank 6, then end water tank 6 is moved in lower crystallizer 12, good seal, after consumable electrode 2 and upper crystallizer 10 centering, be raised up to crystallizer mouth;
The water coolant of the 6th step, closedown dummy device 4, liquid slag is poured in T-shaped crystallizer, and consumable electrode is inserted in the slag bath of upper crystallizer, start esr, the voltage sets of equipment is 68-75V, current settings is 18-20KA, and electrode insertion depth controls at 16mm, and the cooling water flow of upper crystallizer 10 controls at 81m
3/ h, the cooling water flow of lower crystallizer 12 controls at 132m
3/ h, end water tank 6 cooling water flow controls at 23m
3/ h, the cooling water flow of dummy device 4 controls at 12m
3/ h; Metal pool liquid level adopts detector 11 to judge, when the liquid level of metal pool reaches apart from lower crystallizer base 350mm height, start to twitch end water tank 6, steel ingot is pulled out from lower crystallizer 12, when just having started stripping, stripping speed is 1mm/min, be increased to 13mm/min gradually, electrode melting speed is 1300kg/h, always that comsumable melt is complete;
7th step, be incubated by the electroslag remelting plate blank of extraction, prevent slab from cracking, the specification of electroslag remelting plate blank is 200mm × 1250mm × 4000mm, weight about 7.85 tons.
To UNSS32760 duplex stainless steel electroslag slab chemical composition analysis, result as table 2, the requirement of composition conformance with standard.
Table 2 electroslag slab Chemical Composition (% by weight)
UNSS32760 alloy duplex stainless steel stripping electroslag remelting plate blank surface quality is good, does not have the defects such as pipe, slag inclusion, bleed-out, ripple.According to GB/T1979-2001 " structure iron macrostructure defect judge picture " standard, embodiment slab internal soundness is detected, do not find to loosen, segregation, white band, subsurface bubble, Residual hole, skull patch, white point, cracks in crystal boundary, air entrapment, non-metallic inclusion and the defect such as slag inclusion, Non-metallic inclusion thing, steel ingot internal soundness is good.
Embodiment 2: manufacture UNSS31254 super austenitic stainless steel slab.
The first step, employing " intermediate frequency furnace smelt+AOD refining " technique smelt consumable electrode, and electrode specification is that 270mm(is thick) × 1320mm(is wide) × 2800mm(is long), the chemical composition conformance with standard requirement of electrode, as shown in table 3.
Table 3 electrode Chemical Composition (% by weight)
Second step, by clean for consumable electrode surface finish.
3rd step, prepare slag charge.Slag system adopts CaF
2, Al
2o
3, CaO, TiO
2, SiO
2five yuan of slag systems, the weight percent of each constituent element is respectively 54%, 26%, 12%, 3%, 5%, quantity of slag 300kg.Separately inserted in electric furnace by slag charge, temperature controls at 850 DEG C, toasts 7 hours.
4th step, by baked slag system according to CaF
2, MgO, SiO
2, CaO, Al
2o
3joining of order cinder ladle in, striking slag making, change about 90 minutes slag time, slag temperature control, at 1650-1700 DEG C, ensures that slag system melts, changes clearly;
5th step, dummy device 4 to be connected firmly with end water tank 6, then end water tank 6 is moved in lower crystallizer 12, good seal, after consumable electrode 2 and upper crystallizer 10 centering, be raised up to crystallizer mouth;
The water coolant of the 6th step, closedown dummy device 4, liquid slag is poured in T-shaped crystallizer, and consumable electrode is inserted in the slag bath of upper crystallizer, start esr, the voltage sets of equipment is 60-63V, current settings is 15-16KA, and electrode insertion depth controls at 16mm, and the cooling water flow of upper crystallizer 10 controls at 89m
3/ h, the cooling water flow of lower crystallizer 12 controls at 148m
3/ h, end water tank 6 cooling water flow controls at 28m
3/ h, the cooling water flow of dummy device 4 controls at 19m
3/ h; Metal pool liquid level adopts detector 11 to judge, when the liquid level of metal pool reaches apart from lower crystallizer base 360mm height, start to twitch end water tank 6, steel ingot is pulled out from lower crystallizer 12, when just having started stripping, stripping speed is 1mm/min, be increased to 8mm/min gradually, electrode melting speed is 900kg/h, always that comsumable melt is complete;
7th step, is incubated online by the electroslag remelting plate blank of extraction, Slow cooling, avoids cooling too fast generation surface crack, and the specification specification of electroslag remelting plate blank is 200mm × 1250mm × 4000mm, weight about 7.8 tons.
The chemical composition of UNSS31254 super austenitic stainless steel slab is analyzed, result as table 4, the requirement of composition conformance with standard.
Table 4 ESR ingot slab Chemical Composition (% by weight)
UNSS31254 super austenitic stainless steel stripping electroslag remelting plate blank surface quality is good, does not have the defects such as pipe, slag inclusion, bleed-out, ripple.According to GB/T1979-2001 " structure iron macrostructure defect judge picture " standard, embodiment slab internal soundness is detected, do not find to loosen, segregation, white band, subsurface bubble, Residual hole, skull patch, white point, cracks in crystal boundary, air entrapment, non-metallic inclusion and the defect such as slag inclusion, Non-metallic inclusion thing, steel ingot internal soundness is good.
Embodiment 3: manufacture UNSN08825 containing Ti iron abros slab.
The first step, employing " intermediate frequency furnace smelt+AOD refining " technique smelt consumable electrode, and electrode specification is that 270mm(is thick) × 1320mm(is wide) × 2800mm(is long), the chemical composition conformance with standard requirement of electrode, as shown in table 5.
Table 5 electrode Chemical Composition (% by weight)
Second step, by clean for consumable electrode surface finish.
3rd step, prepare slag charge.Slag system adopts CaF
2, Al
2o
3, CaO, TiO
2, SiO
2five yuan of slag systems, the weight percent of each constituent element is respectively 58.4%, 21%, 13%, 3.6%, 4%, quantity of slag 300kg.Separately inserted in electric furnace by slag charge, temperature controls at 850 DEG C, toasts 7 hours.
4th step, by baked slag system according to CaF
2, TiO
2, SiO
2, CaO, Al
2o
3joining of order cinder ladle in, striking slag making, change about 90 minutes slag time, slag temperature control, at 1650-1700 DEG C, ensures that slag system melts, changes clearly;
5th step, dummy device 4 to be connected firmly with end water tank 6, then end water tank 6 is moved in lower crystallizer 12, good seal, after consumable electrode 2 and upper crystallizer 10 centering, be raised up to crystallizer mouth;
The water coolant of the 6th step, closedown dummy device 4, liquid slag is poured in T-shaped crystallizer, and consumable electrode is inserted in the slag bath of upper crystallizer, start esr, the voltage sets of equipment is 63-65V, current settings is 17-18KA, and electrode insertion depth controls at 16mm, and the cooling water flow of upper crystallizer 10 controls at 88m
3/ h, the cooling water flow of lower crystallizer 12 controls at 147m
3/ h, end water tank 6 cooling water flow controls at 27m
3/ h, the cooling water flow of dummy device 4 controls at 18m
3/ h; Metal pool liquid level adopts detector 11 to judge, when the liquid level of metal pool reaches apart from lower crystallizer base 360mm height, start to twitch end water tank 6, steel ingot is pulled out from lower crystallizer 12, when just having started stripping, stripping speed is 1mm/min, be increased to 10mm/min gradually, electrode melting speed is 1100kg/h, always that comsumable melt is complete;
7th step, carries out secondary spray cooling by the electroslag remelting plate blank of extraction, and the specification of electroslag remelting plate blank is 200mm × 1250mm × 4000mm, weight about 8.1 tons.
To UNSN08825 containing Ti iron abros electroslag remelting plate blank chemical composition analysis, result as table 6, the requirement of composition conformance with standard.
Table 6 electroslag slab Chemical Composition (% by weight)
UNSN08825 is good containing Ti iron abros electroslag remelting plate blank surface quality, does not have the defects such as pipe, slag inclusion, bleed-out, ripple.According to GB/T1979-2001 " structure iron macrostructure defect judge picture " standard, embodiment slab internal soundness is detected, do not find to loosen, segregation, white band, subsurface bubble, Residual hole, skull patch, white point, cracks in crystal boundary, air entrapment, non-metallic inclusion and the defect such as slag inclusion, Non-metallic inclusion thing, steel ingot internal soundness is good.
Embodiment 4: manufacture UNSN06625 abros slab.
The first step, adopt " intermediate frequency furnace+AOD furnace " technique to smelt consumable electrode, electrode specification is that 270mm(is thick) × 1320mm(is wide) × 2800mm(is long), the chemical composition conformance with standard requirement of electrode, as shown in table 7;
Table 7 electrode chemical composition (% by weight)
Second step, by clean for consumable electrode surface finish;
3rd step, prepares slag charge.Slag system adopts CaF
2, Al
2o
3, CaO, SiO
2quaternary slag system, the weight percent of each constituent element is respectively 63%, 15%, 13%, 9%, quantity of slag 300kg.Separately inserted in electric furnace by slag charge, temperature controls at 850 DEG C, toasts 8 hours;
4th step, by baked slag system according to CaF
2, SiO
2, CaO, Al
2o
3joining of order cinder ladle in, striking slag making, change about 90 minutes slag time, slag temperature control, at 1650 ~ 1700 DEG C, ensures that slag system melts, changes clearly;
5th step, dummy device 4 to be connected firmly with end water tank 6, then end water tank 6 is moved in lower crystallizer 12, good seal, after consumable electrode 2 and upper crystallizer 10 centering, be raised up to crystallizer mouth;
The water coolant of the 6th step, closedown dummy device 4, liquid slag is poured in T-shaped crystallizer, and consumable electrode is inserted in the slag bath of upper crystallizer, start esr, the voltage sets of equipment is 60-62V, current settings is 16-17KA, and electrode insertion depth controls at 16mm, and the cooling water flow of upper crystallizer 10 controls at 89m
3/ h, the cooling water flow of lower crystallizer 12 controls at 148m
3/ h, end water tank 6 cooling water flow controls at 28m
3/ h, the cooling water flow of dummy device 4 controls at 189m
3/ h; Metal pool liquid level adopts detector 11 to judge, when the liquid level of metal pool reaches apart from lower crystallizer base 370mm height, start to twitch end water tank 6, steel ingot is pulled out from lower crystallizer 12, when just having started stripping, stripping speed is 1mm/min, be increased to 8mm/min gradually, electrode melting speed is 900kg/h, always that comsumable melt is complete;
7th step, carries out secondary spray cooling by the electroslag remelting plate blank of extraction, and the specification of electroslag remelting plate blank is 200mm × 1250mm × 4000mm, weight about 8 tons.
Chemical composition analysis is carried out to UNSN06625 nickel-base alloy electroslag remelting plate blank, result as table 8, the requirement of composition conformance with standard.
Table 8 electroslag slab chemical composition (% by weight)
UNSN06625 nickel-base alloy stripping electroslag remelting plate blank surface quality is good, does not have the defects such as obvious pipe, slag inclusion.According to GB/T1979-2001 " structure iron macrostructure defect judge picture " standard, embodiment slab internal soundness is detected, do not find to loosen, segregation, white band, subsurface bubble, Residual hole, skull patch, white point, cracks in crystal boundary, air entrapment, non-metallic inclusion and the defect such as slag inclusion, Non-metallic inclusion thing, steel ingot internal soundness is good.
Claims (6)
1. thickness is less than a non-corrosive metal electroslag remelting plate blank production unit of 200mm, and the kind of described non-corrosive metal comprises duplex stainless steel, super austenitic stainless steel, iron abros, abros; Described non-corrosive metal electroslag remelting plate blank thickness is less than 200mm, and width is greater than 1250mm; Described equipment includes electrode lifting mechanism (1), electrode (2), crystallizer (3), detector (11), dummy device (4), stripping mechanism (5), end water tank (6), Controlling System (8); It is characterized in that: thickness and the width of described electrode are respectively: 220-270mm, 1320-1460mm, electrode weight is greater than 6 tons, described thickness of electrode, width are greater than produced electroslag remelting plate blank width 70mm, and the length of electrode is less than the length of produced electroslag remelting plate blank; Described crystallizer (3) is T-shaped crystallizer, and described crystallizer includes crystallizer (12) under crystallizer (10), and upper crystallizer (10) sectional dimension is greater than lower crystallizer (12); After described electrode (2) and upper crystallizer (10) centering, on electrode distance, the distance of crystallizer (10) inwall is greater than 50mm; Upper crystallizer internal cavity is of a size of 330-390mm × 1480-1560mm, upper crystallizer height 400mm; Lower crystallizer internal cavity is of a size of 158-208mm × 1258-1408mm, lower crystallizer height 400mm; Described dummy device (4) includes Dummy plate (15) and end water tank (6); Described Dummy plate (15) is square steel plate, and the Dummy plate (15) described in two is symmetricly set on water tank upper surface, end arranged on left and right sides, and described Dummy plate (15) has center hole, and the outside dimension of Circularhole diameter and dummy ingot pipe (13) etc. are large; Described dummy ingot pipe (13) is hollow structure, be communicated with by dummy ingot transverse tube (18) after the dummy ingot pipe (13) described in two be communicated with cooling water system is each passed through end water tank arranged on left and right sides, form cooling water channel, described dummy ingot transverse tube (18) distance end water tank (6) upper surface 35-45mm is high, and described dummy ingot transverse tube (18) forms adhesive spots; Dummy ingot pipe (13) described in two, through the center hole of corresponding Dummy plate, is fixed by sustained ring (16) and two Dummy plates (15); The outside, lower end of described dummy ingot pipe (13) is helicitic texture, makes Dummy plate (15), dummy ingot pipe (13) relative fixing with the position of end water tank (6) by nut (14); Described sustained ring (16) is positioned at the upper surface of described Dummy plate (15) and is enclosed within described dummy ingot pipe (13), and sustained ring (16) and Dummy plate (15), dummy ingot pipe (13) are welded to connect; In the upper surface of described dummy ingot pipe (13) welding " U " type dummy ingot part (17), described " U " type dummy ingot part is steel construction piece, water tank upper surface 50-55mm at the bottom of its apogee distance, and described " U " type dummy ingot part (17) forms adhesive spots.
2. thickness is less than a production technique for the non-corrosive metal electroslag remelting plate blank of 200mm, it is characterized in that: this production technique adopts non-corrosive metal electroslag remelting plate blank production unit according to claim 1; Described production technique comprises the following steps:
1), intermediate frequency furnace+AOD furnace refinery practice is adopted to produce duplex stainless steel, super austenitic stainless steel, iron abros, abros electrode, electrode specification is 220-270mm × 1320-1460mm × 2800-3500mm, electrode weight is greater than 6 tons, consumable electrode is welded on dummy electrode, stand-by;
2), by slag charge at the temperature of 800-850 DEG C, toast 7-8 hour, reduce the moisture content in slag charge, stand-by;
3), adopt Graphite Electrodes, in change cinder ladle, ready slag charge is fused into liquid state, liquid slag temperature controls at 1650-1700 DEG C;
4), described dummy device (4) is connected firmly with water tank of the described end (6), again end water tank (6) is moved in lower crystallizer (12), end water tank (6) is good with the gap seals of lower crystallizer (12) surrounding, after consumable electrode (2) and upper crystallizer (10) centering, be raised up to crystallizer mouth;
5), close dummy device (4) water coolant, liquid slag is poured in T-shaped crystallizer;
6), consumable electrode is inserted in the slag bath on T-shaped crystallizer top, adjust the voltage of equipment, electric current, electrode insertion depth controls at 15-20mm, the burn-off rate of electrode controls at 900-1300kg/h, molten drop is dropped on dummy device (4), the water coolant of dummy device (4) is opened, makes metal pool firmly be set on dummy device (4);
7), metal pool liquid level adopts detector (11) to judge, when the liquid level of metal pool reaches apart from lower crystallizer base 300-380mm height, starts to twitch end water tank, pulled out by steel ingot from lower crystallizer; The speed of twitching is 1-13mm/min, always that comsumable melt is complete; The cooling water flow of upper crystallizer (10) controls at 80-90m
3/ h, the cooling water flow of lower crystallizer (12) controls at 130-150m
3/ h, end water tank (6) cooling water flow controls at 20-30m
3/ h, the cooling water flow of dummy device (4) controls at 10-20m
3/ h;
8), according to need of production, an other consumable electrode is moved in slag bath again, realizes continuous seepage.
3. thickness is less than the production technique of the non-corrosive metal electroslag remelting plate blank of 200mm as claimed in claim 2, it is characterized in that: described non-corrosive metal electroslag remelting plate blank is UNSS32760 two-phase stainless plate slab, the slag system of described UNSS32760 two-phase stainless plate slab adopts CaF
2, Al
2o
3, CaO, MgO, SiO
2five yuan of slag systems, the weight percent of each constituent element is respectively 32%, 31%, 27%, 6%, 4%.
4. thickness is less than the production technique of the non-corrosive metal electroslag remelting plate blank of 200mm as claimed in claim 2, it is characterized in that: described non-corrosive metal electroslag remelting plate blank is UNSS31254 super austenitic stainless steel slab, the slag system of described UNSS31254 super austenitic stainless steel slab adopts CaF
2, Al
2o
3, CaO, TiO
2, SiO
2five yuan of slag systems, the weight percent of each constituent element is respectively 54%, 26%, 12%, 3%, 5%.
5. thickness is less than the production technique of the non-corrosive metal electroslag remelting plate blank of 200mm as claimed in claim 2, it is characterized in that: described non-corrosive metal electroslag remelting plate blank is that UNSN08825 contains Ti iron abros slab, described UNSN08825 adopts CaF containing the slag system of Ti iron abros slab
2, Al
2o
3, CaO, TiO
2, SiO
2five yuan of slag systems, the weight percent of each constituent element is respectively 58.4%, 21%, 13%, 3.6%, 4%.
6. thickness is less than the production technique of the non-corrosive metal electroslag remelting plate blank of 200mm as claimed in claim 2, it is characterized in that: described non-corrosive metal electroslag remelting plate blank is UNSN06625 abros slab, the slag system of described UNSN06625 abros slab adopts CaF
2, Al
2o
3, CaO, SiO
2quaternary slag system, the weight percent of each constituent element is respectively 63%, 15%, 13%, 9%.
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| CN106513599A (en) * | 2016-11-10 | 2017-03-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Pouring method for high-temperature corrosion resisting alloy electrode ingot |
| CN107312937B (en) * | 2017-06-26 | 2019-12-06 | 洛阳双瑞特种装备有限公司 | method and equipment for manufacturing high-silicon stainless steel for high-temperature-resistant concentrated sulfuric acid |
| CN113528847A (en) * | 2021-07-23 | 2021-10-22 | 攀钢集团江油长城特殊钢有限公司 | High-purity UNS N08825 electroslag ingot and preparation method thereof |
| CN114700481B (en) * | 2022-04-06 | 2023-05-12 | 苏州大学 | Device and method for refining ingot tissue and improving surface quality of ingot |
| CN115287394A (en) * | 2022-07-18 | 2022-11-04 | 山西太钢不锈钢股份有限公司 | Production process method of nickel-based alloy large-ingot die casting |
| CN115679156A (en) * | 2022-11-01 | 2023-02-03 | 陕西宝锐金属有限公司 | Process for preparing GH3230 alloy electroslag remelting slab ingot at low cost |
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