CN104152709A - Production process for corrosion resistant alloy electroslag remelting slab with thickness smaller than 200 mm and equipment - Google Patents
Production process for corrosion resistant alloy electroslag remelting slab with thickness smaller than 200 mm and equipment Download PDFInfo
- Publication number
- CN104152709A CN104152709A CN201410405581.7A CN201410405581A CN104152709A CN 104152709 A CN104152709 A CN 104152709A CN 201410405581 A CN201410405581 A CN 201410405581A CN 104152709 A CN104152709 A CN 104152709A
- Authority
- CN
- China
- Prior art keywords
- crystallizer
- dummy
- electrode
- electroslag remelting
- slag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention belongs to the technical field of special alloy formation, and relates to a production process for a corrosion resistant alloy electroslag remelting slab with a thickness smaller than 200 mm and equipment. The thickness, width and length of an electrode in the equipment are respectively 220-270 mm, 1320-1460 mm and 2800-3500 mm; the thickness and width of the electrode are larger than the width of the produced electroslag remelting slab by 70 mm; a crystallizer is a T-shaped crystallizer consisting of an upper crystallizer (10) and a lower crystallizer (12); the section size of the upper crystallizer (10) is larger than that of the lower crystallizer (12); after the electrode (2) is aligned to the upper crystallizer (10), the distance from the electrode to the inner wall of the upper crystallizer (10) is larger than 50 mm; and a dummy ingot device (4) comprises a dummy ingot plate (15), a bottom water tank (6), a dummy ingot pipe (13), a dummy ingot transverse pipe (18) and a U-shaped dummy ingot piece (17). The thickness of the produced corrosion resistant alloy electroslag remelting slab is smaller than 200 mm, and the width thereof is larger than 1250 mm.
Description
Technical field
The invention belongs to special alloy field shaping technique.Relate in particular 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 of supplying on domestic market is mainly International nickel Co. Ltd. Inco. Ltd. of the import U.S., particularly taking non-corrosive metal slab as almost whole dependence on import of product such as the basic non-corrosive metal plate of producing, band, foils.Country special steel field " 12 " planning is pointed out, during " 12 ", need key breakthrough superalloy, 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 the production domesticization of high-quality special steel 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 350 mm × 1250 mm × 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 hot rolled coil one-tenth band, paper tinsels.The technological merit of this scheme is: 1. the specification of consumable electrode is 250 × 1150 × 3000mm, and electrode length is short, realization easy to manufacture, and esr process is easily realized, 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 larger on solidified structure impact, and burn-off rate is lower, and solidified structure is better.Therefore, can adopt low burn-off rate to obtain all good non-corrosive metal electroslag remelting plate blanks of surface quality and solidified structure.The technical disadvantages of this scheme is: 1. slab is too thick, need to, by thick to 200mm slab hammer cogging thick 350mm, carry out subsequent hot rolled after figuring of surface again, and 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 200 mm, width is greater than 1250mm, the slab that weight is greater than 6 tons, former because: traditional fixed crystallizer for electroslag refusion is rectangle, because must ensureing consumable electrode, fixed electroslag remelting process is greater than 50mm apart from the distance of crystallizer wall, that is to say, will production cross-sectional dimensions the electroslag remelting plate blank that is A × B, needed consumable electrode cross-sectional dimensions is (A-100) × (B-100), be so limited, produce 200 mm(thick) × 1250 mm(are wide) × 3000mm(is long), the slab that weight is approximately 6 tons, the specification of electrode is: 100 mm(are 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, state at present, inside and outside all do not adopt fixed electroslag remelting process to produce thickness to be less than 200 mm, width is greater than 1250mm, the electroslag remelting plate blank that weight is greater than 6 tons.
In document " exploration and practice of E Gang 20t plate blank electroslag furnace power supply system ", disclose a kind of slab production method, it adopts T-shaped crystallizer stripping esr mode production specification is the low alloy steel of 320 mm × 1400 mm × 3700mm, 320 mm × 1850 mm × 3900mm.The technological merit of this scheme by: 1. adopt sectional dimension be greater than the electrode of production electroslag remelting plate blank, by the contraction in length of consumable electrode, the production of electrode, planeness, device fabrication etc. easily realize; 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 burn-off rate is less to the solidified structure quality influence of low alloy steel, therefore, can adopt high molten speed (than the molten approximately high 40-50% of speed of fixed esr) production surface quality, solidified inside to organize all heavy slab more than good thickness 300mm.The shortcoming of this scheme is: the low-alloy slab of 1. producing, and still need the slab cogging that is first 320mm by thickness to become the slab below 200mm, after figuring of surface, just can enter Steckel mill and be rolled into hot rolled coil, production process is long, increase cogging, reconditioning operation, production cost increases, and energy consumption increases; 2. cannot realize the non-corrosive metal slab of the thick above high alloy content of 300mm produces, former because: (a) alloying element content of 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) heat conductivility of non-corrosive metal is far below low alloy steel, and 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, the thick equiax crystal of heart portion region 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, at present state, inside and outside have no the non-corrosive metal slab of the method production high alloy content that utilizes stripping esr.
The production method that discloses a kind of non-corrosive metal slab in document " the thick continuous casting steel billet longitudinal crack of N08810 non-corrosive metal 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.The technological merit of this scheme is: save cogging, reconditioning operation, and directly continuous casting, hot rolling one-heating forming, production cost reduces, and saves energy consumption.The technical disadvantages of this scheme 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. is 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, non-corrosive metal sheet billet continuous casting suitability for industrialized production is not realized in home and abroad at present.
Therefore, need to produce thickness and be less than 200 mm, width is greater than 1250mm, the non-corrosive metal electroslag remelting plate blank that weight is greater than 6 tons, make slab directly enter Steckel mill hot rolling rolling, hammer cogging operation in the middle of saving, production cost reduces, Energy Intensity Reduction, the high purity of sheet material, corrosion resistance nature improves, and realizes 10 tons of following small serial productions, 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 200 mm, 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 can directly 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 costs, reduce Energy Intensity Reduction, meet non-corrosive metal plate, band, foil in batches 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 200 mm, 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 transmission from top to bottom after electrode clamping firmly; 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, the size of length direction is determined by the weight of electrode; Electrode weight is greater than 6 tons, the feature of electrode is produced electroslag remelting plate blank width 70mm by thickness of electrode, width are greater than, 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, the thickness of upper crystallizer internal cavity, width are respectively 330-390mm, 1480-1560 mm, and thickness, the width dimensions of electrode are 50mm apart from the safe distance minimum of crystallizer wall; 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 solidifying 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, 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; The dimensions of upper crystallizer mainly considers that after 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 is mainly considered the specification of non-corrosive metal slab, and non-corrosive metal can produce the shrinkage of 3-4mm after solidifying; Therefore, the thickness of upper crystallizer internal cavity, width are respectively 330-390mm, 1480-1560 mm, the high 400mm of upper crystallizer; Lower crystallizer internal cavity is of a size of 158-208mm × 1258-1408 mm, the high 400mm of lower crystallizer; Because slab can shrink 3-4mm after solidifying rear each face and solidifying, upper crystallizer tranverse sectional thickness, width dimensions are greater than at least 50mm of electrode cross-section thickness, width dimensions, ensure electrode in decline process, do not encounter 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, dummy ingot pipe described in be communicated with cooling water system two is communicated with by dummy ingot transverse tube through after end water tank arranged on left and right sides respectively, form cooling water channel, described dummy ingot transverse tube is high apart from water tank upper surface, end 35-45mm, 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 fixing with the position of end water tank by fitting nut; Described sustained ring is positioned at the upper surface of described Dummy plate and is enclosed within on 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, has realized thickness and has been less than 200 mm, and 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 of utilizing described method and apparatus to produce is: 1. smooth surface, without the problem such as pit, ripple; 2. the defect such as, slag inclusion loose without solidifying, crystalline orientation is less than 45 ° with axial angle, and heart portion is without thick equiax crystal district, and slab has good hot-workability; 3. electroslag remelting plate blank can directly enter Steckel mill hot rolling rolling, the hammer cogging operation in the middle of having saved, and production cost reduces, and Energy Intensity Reduction adapts to the non-corrosive metal strip market characteristics, has obvious economic benefit, and the market competitiveness improves.
The stripping electroslag remelting process that the present invention adopts comprises the following steps:
1), adopt intermediate frequency furnace+AOD stove refinery practice 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), slag charge is toasted to 7-8 hour at the temperature of 800-850 DEG C, reduce the moisture content in slag charge, stand-by;
3), adopt Graphite Electrodes ready slag charge to be fused into liquid state changing in cinder ladle, liquid slag temperature is controlled at 1650-1700 DEG C;
4), dummy device is connected firmly with end water tank, then end water tank is moved in lower crystallizer, by the space good seal 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 voltage, the electric current of equipment, electrode depth of penetration is controlled at 15-20mm, the burn-off rate of electrode is controlled 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, in the time that the liquid level of metal pool reaches the lower crystallizer of distance 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 is controlled at 80-90m
3/ h, the cooling water flow of lower crystallizer is controlled at 130-150m
3/ h, end water tank cooling water flow is controlled at 20-30m
3/ h, the cooling water flow of dummy device is controlled at 10-20m
3/ h;
8), according to need of production, an other consumable electrode is moved in slag bath again, realize continuously produce.
The non-corrosive metal electroslag remelting plate blank cross-sectional dimensions of producing 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, can directly enter Steckel mill hot rolling rolling.
Non-corrosive metal slab electroslag remelting process of the present invention and stripping esr equipment, successfully producing the good thickness of internal soundness and 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 can directly 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, can carry out small serial production, this technology has obvious economic benefit, fill up state, the blank in interior external this field.
Brief description of the drawings
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 providing, the present invention is illustrated:
In following embodiment, adopt T-shaped crystallizer 3, in conjunction with Fig. 2, described T-shaped crystallizer 3 comprises crystallizer 10 and lower crystallizer 12; Upper crystallizer 10 sectional dimensions are greater than lower crystallizer 12; Thickness, the width of upper crystallizer 10 inner chambers is respectively 330-390mm, 1480-1560 mm, the high 400mm of upper crystallizer; Lower crystallizer 12 inner cavity sizes are 158-208mm × 1258-1408 mm, the high 400mm of lower crystallizer 12; In conjunction with Fig. 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, dummy ingot pipe 13 described in be communicated with cooling water system two is communicated with by dummy ingot transverse tube 18 through after end water tank arranged on left and right sides respectively, 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 is through the center hole of corresponding Dummy plate, fixing 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 by nut 14; Described sustained ring 16 is positioned at the upper surface of described Dummy plate and is enclosed within on described dummy ingot pipe 13, and sustained ring 16 is welded to connect with Dummy plate 15, dummy ingot pipe 13; 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 UNS S32760 two-phase stainless plate slab.
The first step, employing " intermediate frequency furnace+AOD stove " technique are smelted consumable electrode, and electrode specification is that 270mm(is thick) × 1320 mm(are 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 consumable electrode surface finish.
The 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; Slag charge is separately inserted in electric furnace, and temperature is controlled at 850 DEG C, toasts 8 hours.
The 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 approximately 90 minutes slag time, slag temperature control, at 1650-1700 DEG C, ensures that slag system melts, changes clearly;
The 5th step, dummy device 4 is 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 centerings, is raised up to crystallizer mouth;
The 6th step, close the water coolant of 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 of equipment is set as 68-75V, current settings is 18-20KA, and electrode depth of penetration is controlled at 16mm, and the cooling water flow of upper crystallizer 10 is controlled at 81m
3/ h, the cooling water flow of lower crystallizer 12 is controlled at 132m
3/ h, water tank 6 cooling water flows in the end are controlled at 23m
3/ h, the cooling water flow of dummy device 4 is controlled at 12m
3/ h; Metal pool liquid level adopts detector 11 to judge, in the time that the liquid level of metal pool reaches high apart from lower crystallizer base 350mm, start to twitch end water tank 6, steel ingot is pulled out from lower crystallizer 12, while just starting stripping, stripping speed is 1 mm/min, be increased to gradually 13mm/ min, electrode melting speed is 1300kg/h, always that comsumable melt is complete;
The 7th step, the electroslag remelting plate blank of extraction is incubated, prevents that slab from cracking, the specification of electroslag remelting plate blank is 200mm × 1250mm × 4000mm, approximately 7.85 tons of weight.
To UNS S32760 duplex stainless steel electroslag slab chemical composition analysis, result is as table 2, the requirement of composition conformance with standard.
Table 2 electroslag slab Chemical Composition (% by weight)
UNS S32760 alloy duplex stainless steel stripping electroslag remelting plate blank surface quality is good, there is no the defects such as pipe, slag inclusion, bleed-out, ripple.According to GB/T 1979-2001 " structure iron macrostructure defect grading figure " standard, embodiment slab internal soundness is detected, do not find the defects such as loose, segregation, white band, subsurface bubble, remaining shrinkage cavity, skull patch, white point, axle center intergranular crack, air entrapment, non-metallic inclusion and slag inclusion, Non-metallic inclusion thing, steel ingot internal soundness is good.
Embodiment 2: manufacture UNS S31254 super austenitic stainless steel slab.
The first step, employing " intermediate frequency furnace smelting+AOD refining " technique are smelted consumable electrode, and electrode specification is that 270mm(is thick) × 1320 mm(are 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 consumable electrode surface finish.
The 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.Slag charge is separately inserted in electric furnace, and temperature is controlled at 850 DEG C, toasts 7 hours.
The 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 approximately 90 minutes slag time, slag temperature control, at 1650-1700 DEG C, ensures that slag system melts, changes clearly;
The 5th step, dummy device 4 is 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 centerings, is raised up to crystallizer mouth;
The 6th step, close the water coolant of 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 of equipment is set as 60-63V, current settings is 15-16KA, and electrode depth of penetration is controlled at 16mm, and the cooling water flow of upper crystallizer 10 is controlled at 89m
3/ h, the cooling water flow of lower crystallizer 12 is controlled at 148m
3/ h, water tank 6 cooling water flows in the end are controlled at 28m
3/ h, the cooling water flow of dummy device 4 is controlled at 19m
3/ h; Metal pool liquid level adopts detector 11 to judge, in the time that the liquid level of metal pool reaches high apart from lower crystallizer base 360mm, start to twitch end water tank 6, steel ingot is pulled out from lower crystallizer 12, while just starting stripping, stripping speed is 1 mm/min, be increased to gradually 8mm/ min, electrode melting speed is 900kg/h, always that comsumable melt is complete;
The 7th step, is incubated the electroslag remelting plate blank of extraction online, and Slow cooling is avoided cooling too fast generation surface crack, and the specification specification of electroslag remelting plate blank is 200mm × 1250mm × 4000mm, approximately 7.8 tons of weight.
Chemical composition to UNS S31254 super austenitic stainless steel slab is analyzed, and result is as table 4, the requirement of composition conformance with standard.
Table 4 ESR ingot slab Chemical Composition (% by weight)
UNS S31254 super austenitic stainless steel stripping electroslag remelting plate blank surface quality is good, there is no the defects such as pipe, slag inclusion, bleed-out, ripple.According to GB/T 1979-2001 " structure iron macrostructure defect grading figure " standard, embodiment slab internal soundness is detected, do not find the defects such as loose, segregation, white band, subsurface bubble, remaining shrinkage cavity, skull patch, white point, axle center intergranular crack, air entrapment, non-metallic inclusion and slag inclusion, Non-metallic inclusion thing, steel ingot internal soundness is good.
Embodiment 3: manufacture UNS N08825 containing Ti iron abros slab.
The first step, employing " intermediate frequency furnace smelting+AOD refining " technique are smelted consumable electrode, and electrode specification is that 270mm(is thick) × 1320 mm(are 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 consumable electrode surface finish.
The 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.Slag charge is separately inserted in electric furnace, and temperature is controlled at 850 DEG C, toasts 7 hours.
The 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 approximately 90 minutes slag time, slag temperature control, at 1650-1700 DEG C, ensures that slag system melts, changes clearly;
The 5th step, dummy device 4 is 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 centerings, is raised up to crystallizer mouth;
The 6th step, close the water coolant of 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 of equipment is set as 63-65V, current settings is 17-18KA, and electrode depth of penetration is controlled at 16mm, and the cooling water flow of upper crystallizer 10 is controlled at 88m
3/ h, the cooling water flow of lower crystallizer 12 is controlled at 147m
3/ h, water tank 6 cooling water flows in the end are controlled at 27m
3/ h, the cooling water flow of dummy device 4 is controlled at 18m
3/ h; Metal pool liquid level adopts detector 11 to judge, in the time that the liquid level of metal pool reaches high apart from lower crystallizer base 360mm, start to twitch end water tank 6, steel ingot is pulled out from lower crystallizer 12, while just starting stripping, stripping speed is 1 mm/min, be increased to gradually 10mm/ min, electrode melting speed is 1100kg/h, always that comsumable melt is complete;
The 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, approximately 8.1 tons of weight.
To UNS N08825, containing Ti iron abros electroslag remelting plate blank chemical composition analysis, result is as table 6, the requirement of composition conformance with standard.
Table 6 electroslag slab Chemical Composition (% by weight)
UNS N08825 is good containing Ti iron abros electroslag remelting plate blank surface quality, there is no the defects such as pipe, slag inclusion, bleed-out, ripple.According to GB/T 1979-2001 " structure iron macrostructure defect grading figure " standard, embodiment slab internal soundness is detected, do not find the defects such as loose, segregation, white band, subsurface bubble, remaining shrinkage cavity, skull patch, white point, axle center intergranular crack, air entrapment, non-metallic inclusion and slag inclusion, Non-metallic inclusion thing, steel ingot internal soundness is good.
Embodiment 4: manufacture UNS N06625 abros slab.
The first step, adopts " intermediate frequency furnace+AOD stove " technique to smelt consumable electrode, and electrode specification is that 270mm(is thick) × 1320 mm(are 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 consumable electrode surface finish;
The 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.Slag charge is separately inserted in electric furnace, and temperature is controlled at 850 DEG C, toasts 8 hours;
The 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 approximately 90 minutes slag time, slag temperature control, at 1650 ~ 1700 DEG C, ensures that slag system melts, changes clearly;
The 5th step, dummy device 4 is 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 centerings, is raised up to crystallizer mouth;
The 6th step, close the water coolant of 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 of equipment is set as 60-62V, current settings is 16-17KA, and electrode depth of penetration is controlled at 16mm, and the cooling water flow of upper crystallizer 10 is controlled at 89m
3/ h, the cooling water flow of lower crystallizer 12 is controlled at 148m
3/ h, water tank 6 cooling water flows in the end are controlled at 28m
3/ h, the cooling water flow of dummy device 4 is controlled at 189m
3/ h; Metal pool liquid level adopts detector 11 to judge, in the time that the liquid level of metal pool reaches high apart from lower crystallizer base 370mm, start to twitch end water tank 6, steel ingot is pulled out from lower crystallizer 12, while just starting stripping, stripping speed is 1 mm/min, be increased to gradually 8mm/ min, electrode melting speed is 900kg/h, always that comsumable melt is complete;
The 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, approximately 8 tons of weight.
UNS N06625 nickel-base alloy electroslag remelting plate blank is carried out to chemical composition analysis, and result is as table 8, the requirement of composition conformance with standard.
Table 8 electroslag slab chemical composition (% by weight)
UNS N06625 nickel-base alloy stripping electroslag remelting plate blank surface quality is good, there is no the defects such as obvious pipe, slag inclusion.According to GB/T 1979-2001 " structure iron macrostructure defect grading figure " standard, embodiment slab internal soundness is detected, do not find the defects such as loose, segregation, white band, subsurface bubble, remaining shrinkage cavity, skull patch, white point, axle center intergranular crack, air entrapment, non-metallic inclusion and 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 etc.; Described non-corrosive metal electroslag remelting plate blank thickness is less than 200 mm, and width is greater than 1250mm; Described equipment includes electrode lifting mechanism (1), electrode (2), crystallizer (3), detector (8), 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, the distance of crystallizer on electrode distance (10) inwall is greater than 50mm; Upper crystallizer internal cavity is of a size of 330-390mm × 1480-1560 mm, the high 400mm of upper crystallizer; Lower crystallizer internal cavity is of a size of 158-208mm × 1258-1408 mm, the high 400mm of lower crystallizer; 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, dummy ingot pipe (13) described in be communicated with cooling water system two is communicated with by dummy ingot transverse tube (18) through after end water tank arranged on left and right sides respectively, form cooling water channel, described dummy ingot transverse tube (18) is high apart from end water tank (6) upper surface 35-45mm, and described dummy ingot transverse tube (18) forms adhesive spots; Dummy ingot pipe (13) described in two is through the center hole of corresponding Dummy plate, fixing 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) upper, and sustained ring (16) is welded to connect with Dummy plate (15), dummy ingot pipe (13); At upper surface welding " U " type dummy ingot part (17) of described dummy ingot pipe (13), 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. described in claim 1, thickness is less than the production technique of the non-corrosive metal electroslag remelting plate blank production unit of 200mm, it is characterized in that: described production technique comprises the following steps:
1), adopt intermediate frequency furnace+AOD stove refinery practice 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), slag charge is toasted to 7-8 hour at the temperature of 800-850 DEG C, reduce the moisture content in slag charge, stand-by;
3), adopt Graphite Electrodes ready slag charge to be fused into liquid state changing in cinder ladle, liquid slag temperature is controlled 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), space good seal by end water tank (6) with lower crystallizer (12) surrounding, after consumable electrode (2) and upper crystallizer (10) centering, be raised up to crystallizer mouth;
5), the water coolant of closing dummy device (4), liquid slag is poured in T-shaped crystallizer;
6), consumable electrode is inserted in the slag bath on T-shaped crystallizer top, adjust voltage, the electric current of equipment, electrode depth of penetration is controlled at 15-20mm, the burn-off rate of electrode is controlled at 900-1300kg/h, molten drop is dropped on dummy device (4), the water coolant of dummy device (4) is opened, metal pool is firmly set on dummy device (4);
7), metal pool liquid level adopts detector (11) to judge, in the time that the liquid level of metal pool reaches distance lower crystallizer base 300-380mm height, starts to twitch end water tank, steel ingot is pulled out 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) is controlled at 80-90m
3/ h, the cooling water flow of lower crystallizer (12) is controlled at 130-150m
3/ h, end water tank (6) cooling water flow is controlled at 20-30m
3/ h, the cooling water flow of dummy device (4) is controlled at 10-20m
3/ h;
8), according to need of production, an other consumable electrode is moved in slag bath again, realize continuously produce.
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 UNS S32760 two-phase stainless plate slab, the slag system of described UNS S32760 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 UNS S31254 super austenitic stainless steel slab, the slag system of described UNS S31254 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 UNS N08825 contains Ti iron abros slab, and described UNS N08825 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 UNS N06625 abros slab, the slag system of described UNS N06625 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%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410405581.7A CN104152709B (en) | 2014-08-18 | 2014-08-18 | A kind of thickness is less than the non-corrosive metal electroslag remelting plate blank production technology and equipments of 200mm |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410405581.7A CN104152709B (en) | 2014-08-18 | 2014-08-18 | A kind of thickness is less than the non-corrosive metal electroslag remelting plate blank production technology and equipments of 200mm |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104152709A true CN104152709A (en) | 2014-11-19 |
| CN104152709B CN104152709B (en) | 2016-03-23 |
Family
ID=51878332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410405581.7A Active CN104152709B (en) | 2014-08-18 | 2014-08-18 | A kind of thickness is less than the non-corrosive metal electroslag remelting plate blank production technology and equipments of 200mm |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104152709B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107312937A (en) * | 2017-06-26 | 2017-11-03 | 洛阳双瑞特种装备有限公司 | A kind of the high temperature resistant concentrated sulfuric acid high silicon stainless steel manufacture method and its equipment |
| 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 |
| CN114700481A (en) * | 2022-04-06 | 2022-07-05 | 苏州大学 | Device and method for refining ingot casting structure and improving ingot casting surface quality |
| 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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101418374A (en) * | 2008-11-24 | 2009-04-29 | 江阴兴澄特种钢铁有限公司 | Conductive and continuous casting type electroslag remelting furnace for crystallizer |
| CN101899579A (en) * | 2010-06-18 | 2010-12-01 | 洛阳双瑞特种装备有限公司 | Process for electroslag remelting of steel containing Ti |
| RU2009139827A (en) * | 2009-10-29 | 2011-05-10 | Министерство промышленности и торговли Российской Федерации (Минпромторг России) (RU) | METHOD OF ELECTRIC SLAG REFINING |
| CN102994769A (en) * | 2012-12-19 | 2013-03-27 | 洛阳双瑞特种装备有限公司 | Remelting process of Ni-Cr-Mo anti-corrosion alloy stripping electroslag containing Ti |
| CN103555960A (en) * | 2013-11-04 | 2014-02-05 | 洛阳双瑞特种装备有限公司 | Slag system for ingot drawing electroslag remelting superaustenitic stainless steel |
-
2014
- 2014-08-18 CN CN201410405581.7A patent/CN104152709B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101418374A (en) * | 2008-11-24 | 2009-04-29 | 江阴兴澄特种钢铁有限公司 | Conductive and continuous casting type electroslag remelting furnace for crystallizer |
| RU2009139827A (en) * | 2009-10-29 | 2011-05-10 | Министерство промышленности и торговли Российской Федерации (Минпромторг России) (RU) | METHOD OF ELECTRIC SLAG REFINING |
| CN101899579A (en) * | 2010-06-18 | 2010-12-01 | 洛阳双瑞特种装备有限公司 | Process for electroslag remelting of steel containing Ti |
| CN102994769A (en) * | 2012-12-19 | 2013-03-27 | 洛阳双瑞特种装备有限公司 | Remelting process of Ni-Cr-Mo anti-corrosion alloy stripping electroslag containing Ti |
| CN103555960A (en) * | 2013-11-04 | 2014-02-05 | 洛阳双瑞特种装备有限公司 | Slag system for ingot drawing electroslag remelting superaustenitic stainless steel |
Non-Patent Citations (1)
| Title |
|---|
| 孟凡国等: "油井管用镍基耐蚀合金的两种冶炼工艺比较", 《世界钢铁》, no. 4, 31 December 2013 (2013-12-31), pages 41 - 45 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107312937A (en) * | 2017-06-26 | 2017-11-03 | 洛阳双瑞特种装备有限公司 | A kind of the high temperature resistant concentrated sulfuric acid high silicon stainless steel manufacture method and its equipment |
| 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 |
| CN114700481A (en) * | 2022-04-06 | 2022-07-05 | 苏州大学 | Device and method for refining ingot casting structure and improving ingot casting surface quality |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104152709B (en) | 2016-03-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104152709B (en) | A kind of thickness is less than the non-corrosive metal electroslag remelting plate blank production technology and equipments of 200mm | |
| CN104164574B (en) | A kind of electroslag remelting prepares the method for high-rating generator retaining ring hollow steel ingot | |
| CN100519787C (en) | Plate blank electroslag furnace | |
| CN106801146B (en) | A kind of method that electroslag remelting prepares nickel base superalloy hollow steel ingot | |
| CN111590054B (en) | Device and method for preparing bimetal clad roller by ingot drawing type electroslag remelting method | |
| CN106839762A (en) | The Cold crucible induction melting method of superelevation smelting temperature | |
| CN106216624A (en) | A kind of low-carbon (LC) high chromium content ferrite corrosion-resisting steel continuous small-billet casting manufacture method | |
| CN103233107B (en) | Production method of forged cake for high-temperature alloy turbine disk | |
| CN102634728A (en) | Small square Billet continuous casting production technique of Fe-Mn-C high-manganese steel | |
| WO2018039817A1 (en) | Electroslag fusion preparation method for large-sized curved blade slab | |
| CN103334015A (en) | Low-pollution energy conservation slag system used for manufacturing hollow ingot by remelting electroslag in ingot drawing way | |
| CN104120278A (en) | Novel welding slag ladle for copper slag slow cooling process | |
| CN106378365A (en) | Preparation method of GH625 high-temperature alloy tube blank | |
| CN103436709A (en) | Device and method for preparing electroslag remelting ingot employing tubular electrode additional consumable blender | |
| CN103741083A (en) | Cast pipe blank rolling method for preparing high-performance, large-size and high-precision beryllium copper pipe | |
| CN102443706B (en) | Control method for surface cracks of P91 electroslag steel | |
| CN201400710Y (en) | Electroslag remelting crystallizer for producing high-speed steel | |
| CN211420274U (en) | Crystallizer for metal electroslag remelting and electroslag remelting device | |
| CN104141051A (en) | Slag system for ingot stripping and electroslag remelting of nickel-based alloy plate blank | |
| CN109128103B (en) | Device and method for preparing composite roller/composite steel ingot by electroslag casting method | |
| CN109396409B (en) | Single-point non-equilibrium protection casting method for producing ultrathin large-size aluminum-containing steel special-shaped blank | |
| CN103667733B (en) | The method of hollow bloom steel ingot smelted by a kind of stripping formula electroslag furnace | |
| CN201778087U (en) | Electroslag remelting crystallizer | |
| CN102619862A (en) | MW grade wind-powered torsion shaft and preparation technology thereof | |
| CN109055772B (en) | Electroslag remelting process method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 471000, Binhe Road, hi tech Development Zone, Henan, Luoyang, 32 Patentee after: CSSC Shuangrui (Luoyang) special equipment Co.,Ltd. Address before: 471000, Binhe Road, hi tech Development Zone, Henan, Luoyang, 32 Patentee before: LUOYANG SUNRUI SPECIAL EQUIPMENT Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |