US20120325425A1 - Method for strip casting steel and system for strip casting - Google Patents

Method for strip casting steel and system for strip casting Download PDF

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Publication number
US20120325425A1
US20120325425A1 US13/499,830 US201013499830A US2012325425A1 US 20120325425 A1 US20120325425 A1 US 20120325425A1 US 201013499830 A US201013499830 A US 201013499830A US 2012325425 A1 US2012325425 A1 US 2012325425A1
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US
United States
Prior art keywords
casting
steel
strip
cast
transport band
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.)
Abandoned
Application number
US13/499,830
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English (en)
Inventor
Jochen Wans
Dieter Rosenthal
Jochen Schlüter
Christian Geerkens
Jörg BAUSCH
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Neuenkirchener Maschinenfabrik Emil Kemper GmbH
SMS Group GmbH
Original Assignee
SMS Siemag AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SMS Siemag AG filed Critical SMS Siemag AG
Assigned to SMS SIEMAG AKTIENGESELLSCHAFT reassignment SMS SIEMAG AKTIENGESELLSCHAFT ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BAUSCH, JORG, GEERKENS, CHRISTIAN, SCHLUTER, JOCHEN, ROSENTHAL, DIETER, WANS, JOCHEN
Publication of US20120325425A1 publication Critical patent/US20120325425A1/en
Assigned to NEUENKIRCHENER MASCHINENFABRIK EMIL KEMPER GMBH reassignment NEUENKIRCHENER MASCHINENFABRIK EMIL KEMPER GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Hagenhoff, Thomas, LAZIS, JAN
Assigned to SMS GROUP GMBH reassignment SMS GROUP GMBH CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SMS SIEMAG AKTIENGESELLSCHAFT
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0608—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by caterpillars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B22D11/002—Stainless steels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/126—Accessories for subsequent treating or working cast stock in situ for cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D5/00—Machines or plants for pig or like casting
    • B22D5/04—Machines or plants for pig or like casting with endless casting conveyors
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium

Definitions

  • the invention relates to a method of casting steel with a chromium content of more than 15 percent by weight, particularly more than 33 percent by weight.
  • High temperature-resistant and wear-resistant steels with a high chromium content, as well as carbon-containing alloys, have in the past been manufactured as individual parts in a discontinuous sand casting method. The cast product was then directly processed mechanically without any additional thermo mechanical treatment.
  • the previously known methods for casting steel always start from casting with dimensions which are close to the final dimensions in combination with an offline rolling or an inline rolling.
  • the deforming or rolling step has, in this connection, the purpose of thickness reduction as well as the formation of new structures, the recrystallization. It refers to a method with emphasis on the production of hot wide strip for steel alloys. Particularly in conventional steels, the transformation of the cast structure is absolutely required for achieving the mechanical properties.
  • liquid steel is supplied through a supply system with an appropriately constructed nozzle onto a circulating transport band which is cooled with water from below.
  • the transport band is driven and guided by two guide rollers.
  • the molten steel placed on the transport band solidifies completely while still in the area of primary cooling. After solidification, the band travels into roll stands for inline rolling.
  • the band is coiled after inline rolling and another cooling procedure.
  • Such a casting method for casting strip is known from DE 198 52 275 A1.
  • WO 02/064288 A1 also discloses a method and device for casting and solidifying liquid metal and its division, which is intended especially for ferrous alloys or non-iron metals and their division.
  • endless strips with a pre-determinable thickness are manufactured from the liquid phase by using a strip casting plant.
  • a breaking unit divides these pieces, wherein a pattern of intended breaking points is embossed in the surface of the stripe during casting and solidification which pattern determines the previously defined optimum size of the product pieces.
  • bearing sleeves for turbochargers are cast in a discontinuous casting method, for example, by casting in sand casting molds. Since a mechanical further processing of the individual components is always necessary, the cast pieces are cast with slight excess dimensions, and finally turned. Additional manufacturing steps, for example, drilling, may be required. However, hot rolling with the goal of recrystallization or thickness reduction does not take place.
  • this object is met in a method of the above-mentioned type in that the steel is cast in a horizontal strip casting device.
  • the invention is particularly suitable for casting a steel which additionally has a carbon content of more than 1 percent by weight.
  • the strip casting method can be advantageously used if the steel additionally has a silicon content of more than 2 percent by weight.
  • the cast steel strip or cast plates produced by casting are being cut, milled, drilled or annealed.
  • the invention also relates to a horizontal strip casting device for carrying out the above-explained method.
  • the strip casting device is characterized in that it includes a melting furnace, a casting ladle and a transport band for receiving and cooling liquid steel flowing out of the casting ladle.
  • the invention is directed to using a horizontal strip casting device for producing structural parts or replacement parts, for example, of highly alloyed tool steels, whose dimensions correspond to the cast strip thickness in horizontal strip casting, so that hot rolling with the goal of recrystallization or thickness reduction is not necessary.
  • the blanks can be cast continuously and the manufacture of individual casting molds, as they are used in sand casting, is unnecessary.
  • the transport band has indentations for forming the cast plates within the steel strip or with transversely extending projections for forming intended breaking points within the steel strip.
  • the strip casting device can be provided with additional devices for the mechanical after treatment of the cast plates which were cast by means of the transport band. They are, for example, chip-removing devices for precisely determining the width and the length of the cast plates which already during the casting process have dimensions which are near their final dimensions. Alternatively, the cast semi-finished products are processed by means of various mechanical procedures for obtaining the desired final dimensions.
  • a separating or a cutting device for severing the cast product is arranged following the transport band in the conveying direction.
  • FIGS. 1 a, 1 b are a schematic side view and a top view of a plant for strip casting in accordance with a first embodiment
  • FIGS. 2 a , 2 b are a lateral sectional view of a transport band for casting cast plates, and a top view of the transport band with cast plates having different dimensions being cast next to each other, and
  • FIGS. 3 a - 3 d show temperature patterns of cast pieces cast with a strip casting device as functions of time.
  • the outlet nozzle 4 has a width which corresponds to the width of a cast plate 7 to be cast on the circulating transport band 5 .
  • the transport band 5 is driven and guided by two guide rollers 10 , 11 , each equipped with their own drives 8 , 9 .
  • shaping segments 12 are provided at the two narrow sides of the transport band 5 which travel together with the transpor band 5 , wherein the segments overlap each other or are arranged tightly adjacent to each other in order to prevent the liquid steel from running out.
  • the distance between the segments 12 is predetermined either by the width of the transport band 5 or is adjustable in accordance with the desired width of the plate 7 to be cast.
  • the transport band 5 travels together with the segments 12 through the container 13 of the cooling device 6 which may additionally include further devices for cooling the plate 7 .
  • a cooling liquid can flow through the two guide rollers 10 , 11 .
  • the device 1 Underneath the strip area of the transport band 5 traveling on the upper side of the strip casting device 1 , the device 1 includes, for example, a spray cooling device 14 which sprays cooling liquid against the transport band 5 from the bottom side.
  • a plate 7 can be cast whose length corresponds approximately to the length of the device 1 , or even protrudes beyond the length thereof.
  • the cast plate 7 either has the desired length generated by determining the quantity of liquid steel in the tundish, or the cast plate is severed after leaving the transport band 5 y means of a cutting or breaking device 15 and is conveyed to storage 16 for semi-finished products.
  • the cast plate is forwarded for a further treatment, for example, milling, drilling, annealing or further cutting or other chip-removing methods, to the appropriate devices and units. Since the plate 7 already has the desired thickness, it does not have to be subjected to a rolling procedure as a thermo mechanical treatment process. However, possibly in dependence on the desired material properties, it is also possible to provide a rolling process as a treatment step following the casting procedure, either directly after the casting procedure or after cooling off the cast pieces.
  • a transport band 17 ( FIGS. 2 a , 2 b ) in a further strip casting device 18 has a plurality of indentations 19 whose dimensions are close to the final dimensions of the pieces to be cast in them.
  • the indentations 19 are arranged either only one behind the other or, depending on the width of the transport band 17 , also additionally next to each other. In this case, the indentations 19 , arranged next to each other, may have different dimensions.
  • a plurality of outlet nozzles 20 with an appropriately adapted width are also provided.
  • the casting thickness is between 8 and 25 mm, preferably 15 mm.
  • Typical uses of the high alloy materials are bearing sleeves which have, for example, the dimensions 13 mm (thickness) ⁇ 120 mm (length) and are manufactured by chip-removing processing from cast pieces on a lathe, for example, with the thickness 15 mm and the same width, wherein the hollow cylindrical shape is produced by boring out the core. All other shapes are also obtained by a chip-removing processing of surface materials of the cast pieces.
  • the cast piece geometry is 15 mm (width) ⁇ 125 mm (length); after mechanical processing, particularly chip-removing processing, this results in a structural component geometry of 12.7 mm (width) ⁇ 120 mm (length).
  • the steel In addition to the chromium content of the steel, the steel preferably also contains carbon of more than 1 percent by weight and/or silicon of more than 2 percent by weight.
  • the properties profile of the cast pieces to be cast by the strip casting device 1 or 18 comprises a good high temperature resistance in conjunction with a good wear resistance.
  • the Rockwell hardness (HRC) is 33 to 38 with a tensile strength of about 1,000 MPa.
  • the rapid cooling which is typical for the method, has positive effects on the structure of the cast pieces.
  • the grain size is reduced and precipitations, such as for example, carbides, are present finely dispersed in the matrix because of the impaired diffusion. This results in advantageous mechanical properties.
  • FIGS. 3 a - d there are various possibilities of temperature guidance for cooling the cast pieces.
  • a first mode of operation FIG. 3 a
  • the temperature of the cast products is initially maintained for a predetermined time and is then cooled with a defined cooling rate (curve 21 ).
  • a heating phase may follow (curve 22 ).
  • the cast pieces are cooled only at a later point in time (curve 22 ).
  • the cast products are heated immediately after casting to a defined temperature ( FIG. 3 b ), and are only then cooled with a predetermined cooling rate over a time period which is also predetermined.
  • the cast pieces are cooled quickly by direct quenching ( FIG. 3 c ), and are subsequently subjected to a controlled temperature guidance over time as long as they have not yet assumed the ambient temperature as a result of the quenching process.
  • the cast pieces are cooled to ambient temperature using changing cooling speeds.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Metal Rolling (AREA)
US13/499,830 2009-10-02 2010-10-01 Method for strip casting steel and system for strip casting Abandoned US20120325425A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102009048165.6 2009-10-02
DE102009048165A DE102009048165A1 (de) 2009-10-02 2009-10-02 Verfahren zum Bandgießen von Stahl und Anlage zum Bandgießen
PCT/EP2010/005995 WO2011038925A1 (fr) 2009-10-02 2010-10-01 Procédé de coulée de bandes d'acier et installation de coulée en bandes

Publications (1)

Publication Number Publication Date
US20120325425A1 true US20120325425A1 (en) 2012-12-27

Family

ID=43638695

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/499,830 Abandoned US20120325425A1 (en) 2009-10-02 2010-10-01 Method for strip casting steel and system for strip casting

Country Status (7)

Country Link
US (1) US20120325425A1 (fr)
EP (1) EP2483014B1 (fr)
CN (1) CN102574201A (fr)
DE (1) DE102009048165A1 (fr)
RU (1) RU2532217C2 (fr)
TW (1) TWI576181B (fr)
WO (1) WO2011038925A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10730105B2 (en) 2013-01-25 2020-08-04 Thyssenkrupp Steel Europe Ag Method for producing a flat steel product with an amorphous, partially amorphous or fine-crystalline microstructure and flat steel product with such characteristics

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108941490A (zh) * 2018-08-28 2018-12-07 成都蜀虹装备制造股份有限公司 一种有色金属定向铸造器
CN111534707A (zh) * 2020-04-07 2020-08-14 浙江顺虎铝业有限公司 一种高精度耐磨铝合金材料的一体化生产设备

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4927509A (fr) * 1972-07-07 1974-03-12
US4212343A (en) * 1979-03-16 1980-07-15 Allied Chemical Corporation Continuous casting method and apparatus for structurally defined metallic strips
US4285386A (en) * 1979-03-16 1981-08-25 Allied Chemical Corporation Continuous casting method and apparatus for making defined shapes of thin sheet
US4552199A (en) * 1982-04-08 1985-11-12 Nippon Yakin Kogyo Co., Ltd. Apparatus for producing flake particles
JPS6390339A (ja) * 1986-10-01 1988-04-21 Sumitomo Heavy Ind Ltd ツインベルト式連鋳機
US4776383A (en) * 1982-11-12 1988-10-11 Concast Standard Ag Apparatus for producing strip-like or foil-like products
US5103892A (en) * 1990-02-28 1992-04-14 Asarco Incorporated Continuous casting of discrete shapes
US5756131A (en) * 1992-12-07 1998-05-26 Suh; Kun Hee Continuous building materials moulding device
DE19852275A1 (de) * 1998-11-13 2000-05-25 Schloemann Siemag Ag Anlage und Verfahren zum Bandgießen

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51103035A (en) * 1975-03-10 1976-09-11 Nippon Kokan Kk Fuerokuromuno chuzoho
AU8103882A (en) * 1981-03-12 1982-09-16 British Steel Corp. Continuous casting of metal strip
EP0658633A3 (fr) * 1989-05-16 1995-10-25 Nippon Steel Corp Feuille mince en acier inoxydable pour substrat de catalyseur pour le traitement des gaz d'échappement d'automobiles et son procédé de fabrication.
FR2746333B1 (fr) * 1996-03-22 1998-04-24 Usinor Sacilor Procede de coulee continue d'une bande d'acier inoxydable austenitique sur une ou entre deux parois mobiles dont les surfaces sont pourvues de fossettes, et installation de coulee pour sa mise en oeuvre
CN1210045A (zh) * 1997-08-28 1999-03-10 张友富 卧式连续铸模机
DE10047044A1 (de) * 2000-09-22 2002-04-25 Sms Demag Ag Verfahren und Anlagen zum Herstellen von Bändern und Blechen aus Stahl
ATE296696T1 (de) 2001-02-09 2005-06-15 Sms Demag Ag Verfahren und vorrichtung zum vergie en und erstarren von flüssigem metall und dessen zerteilung
DE102007022931A1 (de) * 2006-05-26 2007-11-29 Sms Demag Ag Verfahren und Vorrichtung zum Herstellen eines Metallbandes durch Stranggießen

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4927509A (fr) * 1972-07-07 1974-03-12
US4212343A (en) * 1979-03-16 1980-07-15 Allied Chemical Corporation Continuous casting method and apparatus for structurally defined metallic strips
US4285386A (en) * 1979-03-16 1981-08-25 Allied Chemical Corporation Continuous casting method and apparatus for making defined shapes of thin sheet
US4552199A (en) * 1982-04-08 1985-11-12 Nippon Yakin Kogyo Co., Ltd. Apparatus for producing flake particles
US4776383A (en) * 1982-11-12 1988-10-11 Concast Standard Ag Apparatus for producing strip-like or foil-like products
JPS6390339A (ja) * 1986-10-01 1988-04-21 Sumitomo Heavy Ind Ltd ツインベルト式連鋳機
US5103892A (en) * 1990-02-28 1992-04-14 Asarco Incorporated Continuous casting of discrete shapes
US5756131A (en) * 1992-12-07 1998-05-26 Suh; Kun Hee Continuous building materials moulding device
DE19852275A1 (de) * 1998-11-13 2000-05-25 Schloemann Siemag Ag Anlage und Verfahren zum Bandgießen

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* Cited by examiner, † Cited by third party
Title
Definition of "breaking point", http://www.thefreedictionary.com/breaking+points, 1991 *
EPO machine translation of DE 19852275, 5/25/00 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10730105B2 (en) 2013-01-25 2020-08-04 Thyssenkrupp Steel Europe Ag Method for producing a flat steel product with an amorphous, partially amorphous or fine-crystalline microstructure and flat steel product with such characteristics

Also Published As

Publication number Publication date
CN102574201A (zh) 2012-07-11
EP2483014A1 (fr) 2012-08-08
EP2483014B1 (fr) 2017-08-16
TW201113110A (en) 2011-04-16
RU2012117180A (ru) 2013-11-10
RU2532217C2 (ru) 2014-10-27
WO2011038925A1 (fr) 2011-04-07
TWI576181B (zh) 2017-04-01
DE102009048165A1 (de) 2011-04-07

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