CN101195154A - Casting mold for hollow steel ingot and producing method thereof - Google Patents
Casting mold for hollow steel ingot and producing method thereof Download PDFInfo
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- CN101195154A CN101195154A CNA2007102032308A CN200710203230A CN101195154A CN 101195154 A CN101195154 A CN 101195154A CN A2007102032308 A CNA2007102032308 A CN A2007102032308A CN 200710203230 A CN200710203230 A CN 200710203230A CN 101195154 A CN101195154 A CN 101195154A
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Abstract
The invention discloses a casting mold for hollow steel ingots and a method for production, in particular discloses the casting mold for the hollow steel ingots and the method for production which are suitable to produce seamless steel pipes with big diameters, thick walls and high alloy. A technical problem which will be solved by the invention is that a steel ingot mold and the method for producing the hollow steel ingots which are enabled to prevent entrapped slag of the steel ingot due to breakages of inner molds and easy to be separated after castings are finished. A technical scheme which is adopted by the invention is a cast mold of hollow steel ingots, cast mold comprises a basal plate which contains ladle bricks, the steel ingot mold and the inner molds which are installed on the basal plate, wherein a steel component is arranged on the middle portion of the inner mold, a layer of fireproof materials is compressed outside the steel component, and a layer of coating materials is compressed outside the layer of fireproof materials. The invention also comprises the method for producing the hollow steel ingots. The hollow steel ingots which are produced through adopting the invention have good quality, and defects such as entrapped slag, cracks and the like won't be produced inside the steel ingots.
Description
Technical field
The present invention relates to a kind of production method of hollow steel ingot, especially be suitable for producing the production method of the steel ingot of heavy caliber, heavy wall, high-alloy seamless steel pipe.
Background technology
The blank that present seamless steel tube production is adopted mainly contains continuous casting billet, steel ingot, forging stock etc., all needs to be provided with punch in the rolling equipment of seamless steel pipe, and steel billet is bored a hole.But be subjected to the restriction of tube material, some steel grades arranged, directly bore a hole, in perforation procedure, be easy to generate implosion, invagination defective with solid steel billet as carbon chrome-molybdenum steel, high-alloy steel, middle carbon silico-manganese steel etc. in low.For this reason, with tube rolling after direct tube rolling of hollow steel ingot or the perforation, in steel pipe's production the later development trend and the target of pursuit; but the hollow steel ingot quality requirement as tube rolling is very high; should guarantee the high-quality requirement of tube rolling, accomplish scale production again that its difficulty is very big.
Existing hollow steel ingot casting method mainly contains two kinds of spun casting and die castings.Centrifugally cast production efficiency is low, equipment complexity, manufacturing cost height.Adopting more is the die casting production method, and this production method need be provided with internal mold when producing hollow steel ingot, makes steel ingot form hollow structure.Internal mold is made by refractory material, requires to have higher refractoriness, thermal conductivity, thermal diffusivity and heat storage coefficient, and thermal coefficient of expansion is low and expansion is even, and is low with the respond of metal oxide.Internal mold has high intensity when low temperature, be convenient to transportation and installation; Intensity significantly reduces when high temperature, under the continuous high temperature effect in addition elevated temperature strength be zero.Refractory material can be resisted the static pressure of molten steel at casting and process of setting again simultaneously, makes refractory material not broken, avoids increasing external large-scale being mingled with of molten steel; Refractory material and molten steel do not soak into mutually, avoid increasing the inclusion content of molten steel.Production method as a kind of hollow steel ingot of the JP1218737 disclosure of the Invention of Kawasaki, Japan system iron Co., Ltd. is coated in a kind of liquid solvent on the fuse, adopts the bottom casting casting, and behind the metal freezing, fuse is extracted from the ingot that solidifies easily.But adopt the coating process complexity of this method, and do not have effectively to solve fuse fragmentation in the casting cycle of steel ingot and incorporate in the steel ingot defectives such as producing slag inclusion.
Summary of the invention
Technical problem to be solved by this invention provides and a kind ofly can prevent the ingot mould that the internal mold fragmentation causes steel ingot slag inclusion and casting to finish to be easy to remove and the production method of hollow steel ingot thereof.
The technical solution adopted for the present invention to solve the technical problems is the mold that waters of hollow steel ingot, include the base plate of runner brick, be installed in ingot mould and internal mold on the base plate, the middle part of internal mold is the steel member, outside the steel member, be coated with refractory masses, daub layer outside refractory masses.
As improvement of the present invention, described steel member is a steel pipe, offers at least one radially passage on described steel pipe.The aperture of described radially passage is 5～20mm, and radially the quantity of passage is offered at least 40/m according to steel member outer wall area
2
As another kind of improvement the of the present invention, on refractory masses, have axial passage.
The thickness of described refractory masses is 15～55mm, and its compositions in weight percentage comprises: refractory material 95～98%; Furane resins 0.5～3.0%; Furan resin hardener 0.12～2.0%, wherein said refractory material are at least a in mullite, chromogen ore in sand form, forsterite sand or the quartz sand, and granularity is less than 25mm.
The thickness of described dope layer is 0.2～1.5mm, and coating is magnesium chromium coating, ZrO2 powder, brown corundum or magnesia powder.
The present invention also provides a kind of method of producing hollow steel ingot, and its step comprises: cast, solidify, the demoulding, level, it is characterized in that the degree of superheat of casting molten steel is 30～50 ℃.
Behind the molten steel solidification, internal mold, steel ingot and external mold cool off together, and heat extraction send outside the high-alloy steel of annealing, takes off external mold and internal mold when the steel ingot temperature is lower than 400 ℃, need heat to send the high-alloy steel of annealing, and the steel ingot temperature is taken off external mold and internal mold in the time of 580～650 ℃.
Steel ingot ingot body casting linear velocity is 100～170mm/min, and cap portion interstitial wire speed is 40～80mm/min.
The hollow steel ingot that adopts the present invention to produce, quality is good, and steel ingot inside can not produce defectives such as slag inclusion, crackle.
Description of drawings
Fig. 1 waters the casting die structure schematic diagram for hollow steel ingot of the present invention;
Fig. 2 is the structural representation of internal mold.
Description of symbols among the figure: the 1-feed trumpet, the 2-internal mold, the 3-ingot mould, 4-molten steel rises mouth, the 5-base plate, the 6-heat-insulating shield, the 7-runner brick, 8-steel member, the 9-refractory masses, the 10-dope layer, 11-is passage radially, 12 axial passages.
The specific embodiment
Hollow steel ingot of the present invention waters the base plate 5 that mold includes runner brick 7, is installed in ingot mould 3 and internal mold 2 on the base plate 5, and runner brick 7 is communicated with the casting gate of feed trumpet 1.As shown in Figure 2, the middle part of internal mold 2 is a steel member 8, is coated with refractory masses 9 outside steel member 8, goes back applying coatings layer 10 outside refractory masses 9.
The effect that 8 pairs of internal molds 2 of steel member play to gain in strength, refractory masses 9 are played heat absorption, are formed the effect of steel ingot endoporus, and dope layer 10 plays the internal mold smooth surface and prevents molten steel and the effect of refractory masses 9 infiltrations.
As shown in Figure 2, in order to make refractory masses 9 firm being coated on the steel member 8, steel member 8 adopts steel pipe to make.Because in casting cycle, refractory material needs discharging gas wherein because be heated, and has at least one radially passage 11 on steel pipe, by the outside exhaust of steel pipe inner chamber.Also axial passage 12 can be set on refractory masses 9, to the top exhaust.As preferred mode, radially passage 11 is for to be provided with the through hole that the aperture is 5～20mm on the steel member, and radially the quantity of passage 11 is offered at least 40/m according to steel member outer wall area
2, exceed with the intensity that does not influence steel member and internal mold.
Internal mold 2 is installed on the base plate 5, the contour structures of internal mold can be various ways, and common is cylindrical, or is made into the taper shape of being convenient to the demoulding, can also install for the ease of internal mold 2, internal mold 2 is made into cylinder and base round platform assembling form or cylinder and base round platform integral form.
In order to guarantee molten steel after entering the inner chamber that waters mold, flow evenly, be provided with two runner brick molten steel rises mouths 4 relative and casting mold shaft heart symmetry in the base plate position of casting mold cavity.
As shown in Figure 1,, 2～6 ingot moulds 3 and internal mold 2 are installed on each base plate 1, and feed trumpet 1 are installed in the medium position of base plate 5 in order to improve the efficient of casting.After the casting gate of molten steel by feed trumpet 1 injected, the runner brick on base plate 57 flowed into each and waters in the mold and cast again.
The casting step of hollow steel ingot of the present invention comprises: cast, solidify, the demoulding, level, obtain hollow steel ingot.
For internal soundness and the surface quality that guarantees hollow steel ingot, according to different steel grades, the degree of superheat of casting molten steel is 30～50 ℃.Behind the molten steel solidification, internal mold, steel ingot and external mold cool off together, when the steel ingot temperature is lower than 400 ℃, take off external mold and internal mold.Need heat to send the high-alloy steel of annealing, the steel ingot temperature is taken off external mold and internal mold in the time of 580～650 ℃.
For underbead crack, the shrinkage cavity that reduces hollow steel ingot, to water ingot casting body linear velocity and be controlled at 100～170mm/min, cap portion interstitial wire speed is controlled at 40～80mm/min, is provided with heat-insulating shield 6 on the top of casting mold cavity simultaneously.
Hollow steel ingot waters the base plate 5 that mold includes runner brick 7, is installed in ingot mould 3 and internal mold 2 on the base plate 5, and runner brick 7 is communicated with the casting gate of feed trumpet 1.Base plate 5 is provided with the ingot mould 3 and the internal mold 2 of four combinations, four steel ingots of can casting simultaneously.The internal diameter of ingot mould 3 is 780mm, and the external diameter of internal mold is 200mm.
The middle part of internal mold 2 be steel pipe as steel member 8, the internal diameter 150mm of steel pipe.Be coated with the refractory masses 9 of 50mm outside steel member 8, the component of refractory masses 9 is chromogen ore in sand form 96%, furane resins 2.8%, furan resin hardener 1.2%.Outside refractory masses 9, be coated with the brown corundum dope layer 10 of 1mm.
At the inwall axially spaced-apart 25mm of steel member 8, the radially passage 11 of 6 12mm that evenly distribute on the same cross section.
The casting steel grade is a 20G high temperature carbon steel hollow steel ingot, and casting step comprises: cast, solidify, the demoulding, level, obtain hollow steel ingot.
During casting, liquid steel temperature is 1562 ℃, adopts the method for making a bet to inject ingot mould from the molten steel rises mouth 4 on the base plate 5, and the casting linear velocity of steel ingot body is 150～160mm/min, and cap portion interstitial wire speed is 70～80mm/min.
Behind the molten steel solidification, internal mold, steel ingot and external mold cool off together, and the steel ingot temperature is taken off external mold and internal mold in the time of 370～400 ℃.
Embodiment 2
Hollow steel ingot waters the base plate 5 that mold includes runner brick 7, is installed in ingot mould 3 and internal mold 2 on the base plate 5, and runner brick 7 is communicated with the casting gate of feed trumpet 1.Base plate 5 is provided with the ingot mould 3 and the internal mold 2 of six combinations, six steel ingots of can casting simultaneously.The internal diameter of ingot mould 3 is 570mm, and the external diameter of internal mold is 150mm.
The middle part of internal mold 2 be steel pipe as steel member 8, internal diameter 80 mm of steel pipe.Be coated with the refractory masses 9 of 40mm outside steel member 8, the component of refractory masses 9 is mullite 96.5%, furane resins 1.5%, furan resin hardener 2%.Outside refractory masses 9, be coated with the zircon English dope layer 10 of 0.45mm.
At the inwall axially spaced-apart 20mm of steel member 8, the radially passage 11 of 4 6mm that evenly distribute on the same cross section.
The casting steel grade is a 1Cr5Mo heat resisting steel hollow steel ingot, and casting step comprises: cast, solidify, the demoulding, level, obtain hollow steel ingot.
During casting, liquid steel temperature is 1563 ℃, adopts the method for making a bet to inject ingot mould from the molten steel rises mouth 4 on the base plate 5, and the casting linear velocity of steel ingot body is 110～140mm/min, and cap portion interstitial wire speed is 40～60mm/min.
Behind the molten steel solidification, internal mold, steel ingot and external mold cool off together, during 620～640 ℃ of steel ingot temperature, take off external mold and internal mold, carry out annealing in process then.
Hollow steel ingot waters the base plate 5 that mold includes runner brick 7, is installed in ingot mould 3 and internal mold 2 on the base plate 5, and runner brick 7 is communicated with the casting gate of feed trumpet 1.Base plate 5 is provided with the ingot mould 3 and the internal mold 2 of six combinations, six steel ingots of can casting simultaneously.The internal diameter of ingot mould 3 is 800mm, and the external diameter of internal mold is 220mm.
The middle part of internal mold 2 be steel pipe as steel member 8, the internal diameter 150mm of steel pipe.Be coated with the refractory masses 9 of 25mm outside steel member 8, the component of refractory masses 9 is quartz sand 97%, furane resins 1.8%, furan resin hardener 1.2%.Outside refractory masses 9, be coated with the magnesium chromium dope layer 10 of 1.5mm.
At the inwall axially spaced-apart 30mm of steel member 8, the radially passage 11 of 6 15mm that evenly distribute on the same cross section offers the axial passage 12 that 2 diameters are 15mm simultaneously as shown in Figure 2 on refractory masses 9.
The casting steel grade is a 27SiMn structural alloy steel hollow steel ingot, and casting step comprises: cast, solidify, the demoulding, level, obtain hollow steel ingot.
During casting, liquid steel temperature is 1548 ℃, adopts the method for making a bet to inject ingot mould from the molten steel rises mouth 4 on the base plate 5, and the casting linear velocity of steel ingot body is 100～135mm/min, and cap portion interstitial wire speed is 40～55mm/min.
Behind the molten steel solidification, internal mold, steel ingot and external mold cool off together, and the steel ingot temperature is taken off external mold and internal mold in the time of 300～350 ℃.
Claims (11)
- Hollow steel ingot water mold, include the base plate of runner brick, be installed in ingot mould and internal mold on the base plate, it is characterized in that, the middle part of internal mold (2) is steel member (8), is coated with refractory masses (9) outside steel member (8), daub layer (10) outside refractory masses (9).
- Hollow steel ingot as claimed in claim 1 water mold, it is characterized in that described steel member is a steel pipe, on described steel pipe, offer at least one radially passage (11).
- Hollow steel ingot as claimed in claim 2 water mold, it is characterized in that the aperture of described radially passage (11) is 5～20mm, radially the quantity of passage (11) is offered at least 40/m according to steel member outer wall area 2
- Hollow steel ingot as claimed in claim 1 or 2 water mold, it is characterized in that, on refractory masses (9), have axial passage (12).
- Hollow steel ingot as claimed in claim 1 water mold, it is characterized in that the thickness of described refractory masses (9) is 15～55mm, its compositions in weight percentage comprises: refractory material 95～98%; Furane resins 0.5～3.0%; Furan resin hardener 0.12～2.0%, wherein said refractory material are at least a in mullite, chromogen ore in sand form, forsterite sand or the quartz sand, and granularity is less than 25mm.
- Hollow steel ingot as claimed in claim 1 water mold, it is characterized in that the thickness of described dope layer (10) is 0.2～1.5mm, coating is magnesium chromium coating, ZrO2 powder, brown corundum or magnesia powder.
- Hollow steel ingot as claimed in claim 1 water mold, it is characterized in that the base plate runner brick (7) of casting mold cavity is provided with two molten steel rises mouths (4) of symmetry.
- 8. as the mold that waters of claim 1 or 7 described hollow steel ingots, it is characterized in that, 2～6 ingot moulds (3) and internal mold (2) are installed on each base plate (5), and be provided with the feed trumpet (1) that waters molten steel at base plate (5) center.
- 9. adopt the method that mold is produced hollow steel ingot of watering of the described hollow steel ingot of claim 1, its step comprises: cast, solidify, the demoulding, level, it is characterized in that the degree of superheat of casting molten steel is 30～50 ℃.
- 10. the method for production hollow steel ingot as claimed in claim 8, it is characterized in that, behind the molten steel solidification, internal mold, steel ingot and external mold cool off together, heat extraction send outside the high-alloy steel of annealing, takes off internal mold and external mold when the steel ingot temperature is lower than 400 ℃, needs heat to send the high-alloy steel of annealing, the steel ingot temperature is taken off internal mold and external mold in the time of 580～650 ℃.
- 11. the method for production hollow steel ingot as claimed in claim 8 is characterized in that, steel ingot ingot body casting linear velocity is 100～170mm/min, and cap portion interstitial wire speed is 40～80mm/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007102032308A CN101195154B (en) | 2007-12-19 | 2007-12-19 | Casting mold for hollow steel ingot and producing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007102032308A CN101195154B (en) | 2007-12-19 | 2007-12-19 | Casting mold for hollow steel ingot and producing method thereof |
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| CN101195154A true CN101195154A (en) | 2008-06-11 |
| CN101195154B CN101195154B (en) | 2010-06-09 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102248135A (en) * | 2011-06-20 | 2011-11-23 | 南阳汉冶特钢有限公司 | Liquid steel casting equipment |
| CN104209481A (en) * | 2014-08-20 | 2014-12-17 | 湖北长煜模具材料有限公司 | Hollow ingot casting mold and method for casting hollow ingot by using same |
| CN104399958A (en) * | 2014-11-04 | 2015-03-11 | 西宁特殊钢股份有限公司 | Runner brick dry embedding method |
| CN106146044A (en) * | 2015-03-26 | 2016-11-23 | 宝山钢铁股份有限公司 | A kind of resistance to molten steel corrodes molding heat-insulating shield and preparation method thereof |
| CN111715855A (en) * | 2020-04-30 | 2020-09-29 | 马鞍山市中桥金属材料有限公司 | Casting method for 1Cr17Ni2 or 5CrNiMoV steel ingot |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4278124A (en) * | 1978-04-11 | 1981-07-14 | Kawasaki Steel Corporation | Method of producing hollow steel ingot and apparatus therefor |
| JPS6163342A (en) * | 1984-09-03 | 1986-04-01 | Kawasaki Steel Corp | Method and device for producing hollow steel ingot |
| US4759399A (en) * | 1986-05-15 | 1988-07-26 | Kawasaki Steel Corporation | Method and apparatus for producing hollow metal ingots |
| JP2000126847A (en) * | 1998-10-22 | 2000-05-09 | Daido Steel Co Ltd | Casting method of hollow steel ingot, and core used for the method |
-
2007
- 2007-12-19 CN CN2007102032308A patent/CN101195154B/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102248135A (en) * | 2011-06-20 | 2011-11-23 | 南阳汉冶特钢有限公司 | Liquid steel casting equipment |
| CN102248135B (en) * | 2011-06-20 | 2012-11-21 | 郭秀梅 | Liquid steel casting equipment |
| CN104209481A (en) * | 2014-08-20 | 2014-12-17 | 湖北长煜模具材料有限公司 | Hollow ingot casting mold and method for casting hollow ingot by using same |
| CN104209481B (en) * | 2014-08-20 | 2016-04-20 | 湖北长煜模具材料有限公司 | Hollow steel ingot casting mold and adopt its cast hollow steel ingot method |
| CN104399958A (en) * | 2014-11-04 | 2015-03-11 | 西宁特殊钢股份有限公司 | Runner brick dry embedding method |
| CN104399958B (en) * | 2014-11-04 | 2016-08-24 | 西宁特殊钢股份有限公司 | Edge method done by runner brick |
| CN106146044A (en) * | 2015-03-26 | 2016-11-23 | 宝山钢铁股份有限公司 | A kind of resistance to molten steel corrodes molding heat-insulating shield and preparation method thereof |
| CN106146044B (en) * | 2015-03-26 | 2019-03-05 | 宝山钢铁股份有限公司 | A kind of resistance to molten steel corrodes molding heat-insulating shield and preparation method thereof |
| CN111715855A (en) * | 2020-04-30 | 2020-09-29 | 马鞍山市中桥金属材料有限公司 | Casting method for 1Cr17Ni2 or 5CrNiMoV steel ingot |
| CN111715855B (en) * | 2020-04-30 | 2021-12-28 | 马鞍山市中桥金属材料有限公司 | Casting method for 1Cr17Ni2 or 5CrNiMoV steel ingot |
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| CN101195154B (en) | 2010-06-09 |
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