CN106890984B - A kind of production method of small-sized hollow electroslag ingot - Google Patents
A kind of production method of small-sized hollow electroslag ingot Download PDFInfo
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- CN106890984B CN106890984B CN201710200071.XA CN201710200071A CN106890984B CN 106890984 B CN106890984 B CN 106890984B CN 201710200071 A CN201710200071 A CN 201710200071A CN 106890984 B CN106890984 B CN 106890984B
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- crystallizer
- water tank
- interior
- electroslag ingot
- pipe
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 82
- 239000002893 slag Substances 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 10
- 238000002844 melting Methods 0.000 claims abstract description 8
- 230000008018 melting Effects 0.000 claims abstract description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 30
- 229910052802 copper Inorganic materials 0.000 claims description 30
- 239000010949 copper Substances 0.000 claims description 30
- 238000001816 cooling Methods 0.000 claims description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 14
- 239000010959 steel Substances 0.000 claims description 14
- 238000011084 recovery Methods 0.000 claims description 12
- 238000009491 slugging Methods 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 5
- 238000002425 crystallisation Methods 0.000 claims description 4
- 230000008025 crystallization Effects 0.000 claims description 4
- 238000009933 burial Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000010583 slow cooling Methods 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims description 3
- 230000008023 solidification Effects 0.000 claims description 3
- 238000007499 fusion processing Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 2
- 238000012856 packing Methods 0.000 abstract description 2
- 238000005266 casting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
- B22D23/06—Melting-down metal, e.g. metal particles, in the mould
- B22D23/10—Electroslag casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/04—Casting hollow ingots
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/06—Ingot moulds or their manufacture
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
A kind of production method of small-sized hollow electroslag ingot of the present invention, belong to hollow electroslag ingot melting technique field, solves the concentricity that can not ensure hollow electroslag ingot present in prior art, big packing ratio can not be ensured, it is complicated, production cost is high, and is not suitable for the technical problem of small-sized hollow electroslag ingot；The present invention is fixed on bottom water tank for interior crystallizer, and outer crystallizer is movable structure；The method of the present invention, which comprises the following steps, welds out hollow electroslag ingot resmelting electrode；Melt solid-state pre-melted slag；Liquid slag is poured into the crystallizer of the present invention, carries out energization fusing；Fusing is stripped after terminating；The present invention has the advantages of simple in construction, easy making, fusion process is simple to operate, production cost is low.
Description
Technical field
The invention belongs to hollow electroslag ingot melting technique field, and in particular to a kind of producer of small-sized hollow electroslag ingot
Method.
Background technology
At present, the production of domestic heavy wall pipe is largely worn using the forged rear bore hole of electric furnace steel ingot, the extruding of solid steel billet
The technique productions such as hole, spun cast pipe；Conventional bore hole and perforation mode of production lumber recovery is low, production process is complicated, cost is high；Casting
Make steel pipe and casting flaw easily occur, do not reach high performance requirements；The hollow bloom of electroslag remelting production, composition and even tissue,
Gas and inclusion content in steel is few, and production cost is low, can substitute forging and casting pipe, so hollow electroslag ingot
Production has very big development space.
The production technology of hollow electroslag ingot is more complicated, particularly the structure design of crystallizer, if the structure of crystallizer
Designing unreasonable not only cumbersome can also directly affect product quality.At present, the crystallizer of conventional production hollow electroslag ingot
Structure mainly has two kinds：Punched-type and stripping formula；Punched-type includes two kinds of upper punched-type and lower punched-type；The lower hollow electricity of punched-type
The slag ingot mode of production uses single branch consutrode, ensure that big relative cylinder charge, but interior crystallizer is in fusion process, from bottom
Bottom water tank progressively penetrate into the centre of outer crystallizer, can not set fixing device at the top of interior crystallizer, easily cause sky
The eccentric defect of heart ingot, the concentricity of hollow ingot can not be ensured；Although upper punched-type can fix interior crystallizer, ensure that hollow
The concentricity of ingot, but need the electrode parallel connection of more circular elongateds to be welded into circular ring type consutrode, so electrode is longer, and
Elongated electrode can not ensure big relative cylinder charge, influence the quality of ESR ingot；The stripping formula hollow electroslag ingot mode of production, using double
Power supply is two transformers and two galvanic circles, and its device structure is complicated, and fund input is big, is suitable for producing larger-diameter
Hollow electroslag ingot, the production of small-sized hollow electroslag ingot is not suitable for it.
The content of the invention
It is an object of the invention to provide a kind of production method of small-sized hollow electroslag ingot, solves nothing present in prior art
Method ensures the concentricity of hollow electroslag ingot, can not ensure big packing ratio, complicated, and production cost is high, and is not suitable for
The technical problem of small-sized hollow electroslag ingot.
To reach above-mentioned purpose, technical scheme is as follows：
A kind of production method of small-sized hollow electroslag ingot of the present invention, wherein the process units of small-sized hollow electroslag ingot is including outer
Crystallizer, interior crystallizer, bottom water tank, copper coin and circulating cooling system；Interior crystallizer is fixed on bottom water tank, and outer crystallizer is activity
Formula structure；
Circulating cooling system includes diversion box, recovery tank, interior crystallizer cooling system, outer crystallizer cooling system and bottom water
Case cooling system；Bottom water tank cooling system：Bottom water tank is respectively equipped with bottom water tank inlet and bottom water outlet of water tank in both sides；Bottom water
Case water inlet is connected by high-pressure rubber pipe with diversion box；Bottom water outlet of water tank is connected by high-pressure rubber pipe with recovery tank；Outer crystallization
Device cooling system is provided with outer crystallizer water inlet and outer crystallizer delivery port including outer crystallizer, and outer crystallizer water inlet passes through
High-pressure rubber pipe is connected with diversion box, and outer crystallizer delivery port is connected by high-pressure rubber pipe with recovery tank；Interior crystallizer cooling system：
Water inlet pipe and return pipe are provided with inside interior crystallizer；Water inlet pipe is higher than interior crystallizer bottom surface, and return pipe is put down less than on interior crystallizer
Face；Water inlet pipe and return pipe are respectively welded on the bottom surface of interior crystallizer；Water inlet pipe is connected by high-pressure rubber pipe with diversion box, is returned
Water pipe is connected by high-pressure rubber pipe with recovery tank；
Between interior crystallizer and bottom water tank, copper coin is bolted copper coin with interior crystallizer, copper coin and bottom water tank
It is bolted；Copper coin on the bottom water tank is provided with seam, and seam is used for the positioning of outer crystallizer；The outer crystallizer
The both sides on top be provided with hanger；
The height of the seam is defined as 5mm；
The making material of the interior crystallizer and outer crystallizer is thick-wall red copper plate；
The pattern draft of the outer crystallizer is 0.88, and the pattern draft of crystallinity is 1.1；
The outer crystallizer inner ring copper plate thickness is 16mm, and outer ring steel plate thickness is 10mm；Interior crystallizer thickness is 16mm；
Copper plate thickness is 30mm on the water tank of bottom；
The water inlet pipe of the interior crystallizer cooling water recirculation system is higher than interior crystallizer bottom surface 10mm, and return pipe is less than interior knot
Plane 20mm on brilliant device；
The water inlet pipe and return pipe use Φ 32 copper pipe, prevent oxide etch in use；
A kind of production method of small-sized hollow electroslag ingot of the present invention comprises the following steps：
Step 1：Weld out hollow electroslag ingot resmelting electrode：Consutrode is welded into cylinder using multiple sector electrode rods
Shape consutrode, weld together respectively with cylindric consutrode by the use of three No. 45 steel poles as dummy electrode；
Step 2：Solid-state pre-melted slag is fused into liquid slag with slugging stove, slag temperature control system is at 1700 DEG C -- 1800 DEG C；
Step 3：Liquid slag in step 2 in slugging stove is poured into the life of small-sized hollow electroslag ingot with private station bag
In the crystallizer for producing device；
Step 4：After liquid slag is poured into the crystallizer inside of the process units of small-sized hollow electroslag ingot, rapidly hollow
The consutrode of the resmelting electrode of ESR ingot is inserted into the crystallizer of the process units of small-sized hollow electroslag ingot, and energization is melted
Change consutrode.
Step 5：After comsumable melt terminates, treat that molten steel solidification completely is stripped, the hollow electroslag ingot after the demoulding
Burial pit is put into time carries out slow cooling.
In the step 1, the relative cylinder charge of cylindric consutrode is 0.4--0.45.
Preferably, in the step 1, the relative cylinder charge of electroslag remelting is preferably 0.426.
In the step 2, the scope of the quantity of slag of electroslag melting is：G slags=(5.5--6.5) %G ingots.
Preferably, G slags=6%G ingots in the step 2.
The advantageous effects of the present invention：The pattern draft of outer crystallizer is 0.88, and the pattern draft of crystallinity is
1.1, melting takes off ingot after terminating convenient, efficiently avoid ESR ingot " locking " in interior crystallizer, can not take off ingot phenomenon；Interior crystallization
Device is bolted with bottom water tank, is easy to dismounting to repair；Outer crystallizer is positioned using the seam of bottom water tank, simple to operate
It is convenient；Inside and outside crystallizer its position in fusion process is entirely fixed, ensure that the uniform wall thickness of hollow electroslag ingot and interior
The concentricity in hole；Plane copper plate thickness is 30mm on the water tank of bottom, both ensure that good power effect, in turn ensure that inside and outside crystallization
The intensity of device, prevent deformation of the plane copper coin during long-term use on the water tank of bottom；Interior crystallizer cooling water recirculation system is entered
Water pipe is higher than interior crystallizer bottom surface 10mm, and return pipe is less than plane 20mm on interior crystallizer.So as to ensure that the good of cooling water
Circulation and the cooled and solidified speed to crystallizer and melting molten steel；Cylindrical shape is welded into using sector electrode, increases relative cylinder charge；
The rational quantity of slag ensure that reflow process is fully completed to chemically react, and ensure that the quality of hollow electroslag ingot, improve fusing speed
Degree, reduces melting cost；And the present invention has the advantages of simple in construction, easy making, fusion process is simple to operate.
Brief description of the drawings
Fig. 1 is the structural representation of the process units of the middle-size and small-size hollow electroslag ingot of the present invention；
Fig. 2 is a kind of flow chart of the production method of small-sized hollow electroslag ingot of the present invention；
Wherein, 1, hanger, 2, interior crystallizer, 3, outer crystallizer, 4, copper coin, 5, bolt, 6, seam, 7, bottom water tank, 8, outer
Crystallizer water inlet, 9, outer crystallizer delivery port, 10, water inlet pipe, 11, return pipe.
Specific embodiment
1 couple of present invention is further elaborated below in conjunction with the accompanying drawings.
Referring to accompanying drawing 1 and accompanying drawing 2, wherein a kind of production method of small-sized hollow electroslag ingot of the present invention, small size air electrocardio slag
The process units of ingot, including outer crystallizer 3, interior crystallizer 2, bottom water tank 7, copper coin 4 and circulating cooling system；Interior crystallizer 2 is solid
Bottom water tank 7 is scheduled on, outer crystallizer 3 is movable structure；
Circulating cooling system includes diversion box, recovery tank, interior crystallizer cooling system, outer crystallizer cooling system and bottom water
Case cooling system；Bottom water tank cooling system：Bottom water tank 7 is respectively equipped with bottom water tank inlet and bottom water outlet of water tank in both sides；Bottom
Water tank inlet is connected by high-pressure rubber pipe with diversion box；Bottom water outlet of water tank is connected by high-pressure rubber pipe with recovery tank；Outer knot
Brilliant device cooling system is provided with outer crystallizer water inlet 8 and outer crystallizer delivery port 9, outer crystallizer water inlet including outer crystallizer
8 are connected by high-pressure rubber pipe with diversion box, and outer crystallizer delivery port 9 is connected by high-pressure rubber pipe with recovery tank；Interior crystallizer is cold
But system：The inside of interior crystallizer 2 is provided with water inlet pipe 10 and return pipe 11；Water inlet pipe 10 is higher than the bottom surface of interior crystallizer 2, return pipe
11 less than plane on interior crystallizer 2；Water inlet pipe 10 and return pipe 11 are respectively welded on the bottom surface of interior crystallizer 2；Water inlet pipe 10
Connected by high-pressure rubber pipe with diversion box, return 11 water pipes and connected by high-pressure rubber pipe with recovery tank；
Between interior crystallizer and bottom water tank, copper coin 4 is bolted copper coin 4 with interior crystallizer, copper coin 4 and bottom water
Case 7 is bolted；The copper coin 4 is provided with seam 6, and seam 6 is used for the positioning of outer crystallizer 3；The outer crystallizer 3
The both sides on top be provided with hanger 1；
The height of the seam 6 is defined as 5mm；
The making material of the interior crystallizer 2 and outer crystallizer 3 is thick-wall red copper plate；
The pattern draft of the outer crystallizer 3 is 0.88, and the pattern draft of interior crystallizer 2 is 1.1；
The inner ring copper plate thickness of outer crystallizer 3 is 16mm, and outer ring steel plate thickness is 10mm；The thickness of interior crystallizer 2 is
16mm；The thickness of copper coin 4 is 30mm on bottom water tank 7；
The water inlet pipe 10 of the cooling water recirculation system of interior crystallizer 2 is higher than interior crystallizer bottom surface 10mm, and return pipe 11 is low
In plane 20mm on interior crystallizer 2；
The water inlet pipe 10 and return pipe 11 prevent oxide etch in use using Φ 32 copper pipe；
A kind of production method of small-sized hollow electroslag ingot of the present invention comprises the following steps：
Step 1：Weld out hollow electroslag ingot resmelting electrode：Consutrode is welded into cylinder using multiple sector electrode rods
Shape consutrode, weld together respectively with cylindric consutrode by the use of three No. 45 steel poles as dummy electrode；
Step 2：Solid-state pre-melted slag is fused into liquid slag with slugging stove, slag temperature control system is at 1700 DEG C -- 1800 DEG C；
Step 3：Liquid slag in step 2 in slugging stove is poured into the life of small-sized hollow electroslag ingot with private station bag
In the crystallizer for producing device；
Step 4：After liquid slag is poured into the crystallizer inside of the process units of small-sized hollow electroslag ingot, rapidly hollow
The consutrode of the resmelting electrode of ESR ingot is inserted into the crystallizer of the process units of small-sized hollow electroslag ingot, and energization is melted
Change consutrode.
Step 5：After comsumable melt terminates, treat that molten steel solidification completely is stripped, the hollow electroslag ingot after the demoulding
Burial pit is put into time carries out slow cooling.
In the step 1, the relative cylinder charge of cylindric consutrode is 0.4--0.45.
Preferably, in the step 1, the relative cylinder charge of electroslag remelting is preferably 0.426.
In the step 2, the scope of the quantity of slag of electroslag melting is：G slags=(5.5--6.5) %G ingots.
Preferably, G slags=6%G ingots in the step 2.
Claims (1)
- A kind of 1. production method of small-sized hollow electroslag ingot, wherein the process units of small-sized hollow electroslag ingot includes outer crystallizer (3), interior crystallizer (2), bottom water tank (7), copper coin (4) and circulating cooling system；Interior crystallizer (2) is fixed on bottom water tank (7), outside Crystallizer (3) is movable structure；The pattern draft of the outer crystallizer (3) is 0.88, and the pattern draft of interior crystallizer (2) is 1.1；It is cold that circulating cooling system includes diversion box, recovery tank, interior crystallizer cooling system, outer crystallizer cooling system and bottom water tank But system；Bottom water tank cooling system：Bottom water tank (7) is respectively equipped with bottom water tank inlet and bottom water outlet of water tank in both sides；Bottom water Case water inlet is connected by high-pressure rubber pipe with diversion box；Bottom water outlet of water tank is connected by high-pressure rubber pipe with recovery tank；Outer crystallization Device cooling system is provided with outer crystallizer water inlet (8) and outer crystallizer delivery port (9), outer crystallizer water inlet including outer crystallizer Mouth (8) is connected by high-pressure rubber pipe with diversion box, and outer crystallizer delivery port (9) is connected by high-pressure rubber pipe with recovery tank；Interior knot Brilliant device cooling system：Water inlet pipe (10) and return pipe (11) are provided with inside interior crystallizer (2)；Water inlet pipe (10) is higher than interior crystallizer (2) bottom surface, return pipe (11) is less than plane on interior crystallizer (2)；Water inlet pipe (10) and return pipe (11) are respectively welded to be tied inside On the bottom surface of brilliant device (2)；Water inlet pipe (10) is connected by high-pressure rubber pipe with diversion box, and return pipe (11) is by high-pressure rubber pipe with returning Water tank connects；The water inlet pipe (10) of interior crystallizer (2) cooling water recirculation system is higher than interior crystallizer bottom surface 10mm, return pipe (11) Less than plane 20mm on interior crystallizer (2)；Between interior crystallizer and bottom water tank, copper coin (4) is bolted copper coin (4) with interior crystallizer, copper coin (4) and bottom Water tank (7) is bolted；The copper coin (4) is provided with seam (6), and seam (6) is used for the positioning of outer crystallizer (3)；Institute The both sides for stating the top of outer crystallizer (3) are provided with hanger (1), and the height of the seam (6) is defined as 5mm, the interior crystallizer (2) and the making material of outer crystallizer (3) is thick-wall red copper plate, and outer crystallizer (3) the inner ring copper plate thickness is 16mm, outer ring Steel plate thickness is 10mm；Interior crystallizer (2) thickness is 16mm；Copper coin (4) thickness is 30mm on bottom water tank (7), the water inlet pipe (10) and return pipe (11) uses Φ 32 copper pipe, prevents oxide etch in use, it is characterised in that the producer Method comprises the following steps：Step 1：Weld out hollow electroslag ingot resmelting electrode：Consutrode is welded into cylindrical shape certainly using multiple sector electrode rods Power pole, weld together respectively with cylindric consutrode by the use of three No. 45 steel poles as dummy electrode；The relative cylinder charge of the cylindric consutrode is 0.4--0.45；Step 2：Solid-state pre-melted slag is fused into liquid slag with slugging stove, slag temperature control system is at 1700--1800 DEG C；The scope of the quantity of slag of the electroslag melting is：G slags=(5.5--6.5) %G ingots；Step 3：The production that liquid slag in step 2 in slugging stove is poured into small-sized hollow electroslag ingot with private station bag fills In the crystallizer put；Step 4：After liquid slag is poured into the process units inside of small-sized hollow electroslag ingot, rapidly the remelting of hollow electroslag ingot The consutrode of electrode is inserted into the crystallizer of the process units of small-sized hollow electroslag ingot, and energization carries out fusing consutrode；Step 5：After comsumable melt terminates, treat that molten steel solidification completely is stripped, the hollow electroslag ingot after the demoulding is timely It is put into burial pit and carries out slow cooling.
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| CN201710200071.XA CN106890984B (en) | 2017-03-30 | 2017-03-30 | A kind of production method of small-sized hollow electroslag ingot |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7385560B2 (en) * | 2017-10-05 | 2023-11-22 | ラム リサーチ コーポレーション | Electromagnetic casting system including furnace and mold for producing silicone tubes |
| CN108284213B (en) * | 2018-01-26 | 2024-01-26 | 江苏星火特钢集团有限公司 | Device for preventing ingot-drawing type hollow electroslag remelting inner crystallizer from locking by online dynamic monitoring and adjusting method thereof |
| CN109261744A (en) * | 2018-09-28 | 2019-01-25 | 河南中原特钢装备制造有限公司 | A kind of major diameter dual phase steel pipe manufacturing method |
| CN109894603B (en) * | 2018-12-19 | 2021-04-20 | 鞍钢铸钢有限公司 | Production method of extra-thick electroslag slab |
| CN110129577B (en) * | 2019-05-15 | 2021-02-12 | 宁波创润新材料有限公司 | Core crystallizer for casting hollow ingot and water-cooled crystallizer containing core crystallizer |
| CN110193591A (en) * | 2019-06-05 | 2019-09-03 | 太仓市华鑫轧辊有限公司 | A kind of cylinder shape Forging reparation set hollow electroslag remelting device of blank |
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|---|---|---|---|---|
| US4269258A (en) * | 1978-07-20 | 1981-05-26 | Heinrich Sonntag | Core for molds for electrically melting metals for casting hollow ingots |
| CN104164574A (en) * | 2014-08-13 | 2014-11-26 | 东北大学 | Method for preparing hollow steel ingot for protection ring of large power generator by adopting electroslag remelting |
| CN205893362U (en) * | 2016-06-30 | 2017-01-18 | 吉林省维尔特隧道装备有限公司 | A sector electrode for producing hollow electroslag spindle |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3848657A (en) * | 1972-12-29 | 1974-11-19 | V Tetjuev | Apparatus for electroslag melting of hollow ingots |
| DE2402688C3 (en) * | 1974-01-21 | 1978-04-13 | Venjukovskij Armaturnyj Zavod, Tschechow, Moskowskaja Oblast (Sowjetunion) | Storage of a mold for electroslag remelting |
| CN2241697Y (en) * | 1996-03-26 | 1996-12-04 | 杨兆顺 | Electroslag hollow refining smelting equipment for rolling stainless seamless steel tube by hollow smelting operation |
| CN101612661B (en) * | 2009-07-15 | 2011-02-02 | 饶云福 | Heavy caliber uniform section hollow steel ingot device for electro-slag continuous stripping |
| CN201931055U (en) * | 2010-12-20 | 2011-08-17 | 浙江一胜特工模具股份有限公司 | Device for manufacturing hollow electroslag ingot |
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2017
- 2017-03-30 CN CN201710200071.XA patent/CN106890984B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4269258A (en) * | 1978-07-20 | 1981-05-26 | Heinrich Sonntag | Core for molds for electrically melting metals for casting hollow ingots |
| CN104164574A (en) * | 2014-08-13 | 2014-11-26 | 东北大学 | Method for preparing hollow steel ingot for protection ring of large power generator by adopting electroslag remelting |
| CN205893362U (en) * | 2016-06-30 | 2017-01-18 | 吉林省维尔特隧道装备有限公司 | A sector electrode for producing hollow electroslag spindle |
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| CN106890984A (en) | 2017-06-27 |
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