US20120325425A1 - Method for strip casting steel and system for strip casting - Google Patents
Method for strip casting steel and system for strip casting Download PDFInfo
- 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
- Authority
- 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
Links
Images
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
Abstract
Description
- 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.
- When horizontally casting steel strip, 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.
- In strip casting, 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. In that case, 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.
- On the other hand, selected structural components, for example, 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.
- It is the object of the invention to produce special steel alloys while reducing the process steps and the energy used, i.e., simpler than has been possible in the past.
- In accordance with the invention, this object is met in a method of the above-mentioned type in that the steel is cast in a horizontal strip casting device.
- By using the strip casting method, it is possible to continuously manufacture steel strips with very small thicknesses, for example, of 50 mm or less.
- Advantageous further developments of the invention result from the dependent Claims.
- The invention is particularly suitable for casting a steel which additionally has a carbon content of more than 1 percent by weight.
- In the same manner, the strip casting method can be advantageously used if the steel additionally has a silicon content of more than 2 percent by weight.
- It can be provided that 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.
- In accordance with the invention, 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. Accordingly, 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.
- In accordance with an advantageous further development of the strip casting device, 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. Advantageously, it can also be provided that a separating or a cutting device for severing the cast product is arranged following the transport band in the conveying direction.
- In the following, the invention will be explained in more detail with the aid of embodiments. In the drawing:
-
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. - A strip casting device 1 (
FIGS. 1 a, 1 b) for casting a steel with a chromium content of more than 15 percent by weight comprises a feeding system for liquid steel with afurnace 2 and a tundish or acasting ladle 3 for storing or confectioning a certain quantity of liquid steel which is conveyed through anoutlet nozzle 4 onto anendless transport band 5, which preferably also consists of steel, with acooling device 6, wherein thecooling device 6 comprises, for example, abasin 13 with a cooling liquid through which thetransport band 5 is passed through on its bottom side. - The
outlet nozzle 4 has a width which corresponds to the width of acast plate 7 to be cast on the circulatingtransport band 5. Thetransport band 5 is driven and guided by twoguide rollers - Preferably, shaping segments 12 are provided at the two narrow sides of the
transport band 5 which travel together with thetranspor 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 thetransport band 5 or is adjustable in accordance with the desired width of theplate 7 to be cast. For cooling, thetransport band 5 travels together with the segments 12 through thecontainer 13 of thecooling device 6 which may additionally include further devices for cooling theplate 7. For example, a cooling liquid can flow through the twoguide rollers transport band 5 traveling on the upper side of the strip casting device 1, the device 1 includes, for example, aspray cooling device 14 which sprays cooling liquid against thetransport band 5 from the bottom side. In this manner, aplate 7 can be cast whose length corresponds approximately to the length of the device 1, or even protrudes beyond the length thereof. Thecast 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 breakingdevice 15 and is conveyed tostorage 16 for semi-finished products. From there, 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 theplate 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. - As an alternative to the above-described embodiment of a strip casting device, a transport band 17 (
FIGS. 2 a, 2 b) in a furtherstrip casting device 18 has a plurality ofindentations 19 whose dimensions are close to the final dimensions of the pieces to be cast in them. Theindentations 19 are arranged either only one behind the other or, depending on the width of thetransport band 17, also additionally next to each other. In this case, theindentations 19, arranged next to each other, may have different dimensions. In accordance with the number of rows ofindentations 19 arranged next to each other on thetransport band 17, a plurality ofoutlet nozzles 20 with an appropriately adapted width are also provided. After leaving thetransport band 17, the cast pieces cast in thetransport band 17 are conveyed tostorage 16 for semi-finished products, as illustrated inFIG. 1 b. - By casting strips, it is possible to produce cast pieces having the most diverse thicknesses; usually 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 thethickness 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. - In another embodiment, 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).
- 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. - In the manner of operation according to the invention, 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.
- In accordance with the invention, there are various possibilities of temperature guidance for cooling the cast pieces (
FIGS. 3 a-d). In accordance with 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). Alternatively, after a longer period of time during which the temperature is maintained, a heating phase may follow (curve 22). In this case, the cast pieces are cooled only at a later point in time (curve 22). - In accordance with a second method, 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. - In accordance with another mode of operation, 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. - In accordance with another mode of operation (
FIG. 3 d), the cast pieces are cooled to ambient temperature using changing cooling speeds. - 1 Strip casting device
- 2 Furnace
- 3 Casting ladle
- 4 Outlet nozzle
- 5 Transport band
- 6 Cooling device
- 7 Cast plate
- 8 Drive
- 9 Drive
- 10 Guide roller
- 11 Guide roller
- 12 Segments
- 13 Container
- 14 Spray cooling device
- 15 Cutting or breaking device
- 16 Storage of semi-finished products
- 17 Transport band
- 18 Strip casting device
- 19 Indentations
- 20 Outlet nozzles
- 21 Curve
- 22 Curve
Claims (10)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009048165A DE102009048165A1 (en) | 2009-10-02 | 2009-10-02 | Method for strip casting of steel and plant for strip casting |
DE102009048165.6 | 2009-10-02 | ||
PCT/EP2010/005995 WO2011038925A1 (en) | 2009-10-02 | 2010-10-01 | Method for strip casting steel and system for strip casting |
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 (en) |
EP (1) | EP2483014B1 (en) |
CN (1) | CN102574201A (en) |
DE (1) | DE102009048165A1 (en) |
RU (1) | RU2532217C2 (en) |
TW (1) | TWI576181B (en) |
WO (1) | WO2011038925A1 (en) |
Cited By (1)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108941490A (en) * | 2018-08-28 | 2018-12-07 | 成都蜀虹装备制造股份有限公司 | A kind of non-ferrous metal directional casting device |
CN111534707A (en) * | 2020-04-07 | 2020-08-14 | 浙江顺虎铝业有限公司 | Integrated production equipment for high-precision wear-resistant aluminum alloy material |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4927509A (en) * | 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 (en) * | 1986-10-01 | 1988-04-21 | Sumitomo Heavy Ind Ltd | Twin belt type continuous casting machine |
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 (en) * | 1998-11-13 | 2000-05-25 | Schloemann Siemag Ag | Apparatus for strip casting steel melts has casting molds that run with the conveyor belt to shape the strip narrow sides |
Family Cites Families (8)
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 (en) * | 1989-05-16 | 1995-10-25 | Nippon Steel Corp | Stainless steel foil for automobile exhaust gaspurifying catalyst carrier and process for preparation thereof. |
FR2746333B1 (en) * | 1996-03-22 | 1998-04-24 | Usinor Sacilor | METHOD FOR CONTINUOUSLY CASTING A AUSTENITIC STAINLESS STEEL STRIP ON OR BETWEEN TWO MOBILE WALLS WITH SURFACES PROVIDED WITH PITCHES, AND CASTING INSTALLATION FOR IMPLEMENTING SAME |
CN1210045A (en) * | 1997-08-28 | 1999-03-10 | 张友富 | Horizontal continuous mould casting apparatus |
DE10047044A1 (en) * | 2000-09-22 | 2002-04-25 | Sms Demag Ag | Processes and plants for the production of steel strips and sheets |
ATE296696T1 (en) | 2001-02-09 | 2005-06-15 | Sms Demag Ag | METHOD AND DEVICE FOR CASTING AND SOLIDIFYING LIQUID METAL AND SPECIFICATION THEREOF |
DE102007022931A1 (en) * | 2006-05-26 | 2007-11-29 | Sms Demag Ag | Production of a metal strip used in a continuous casting process comprises using rolling and milling operations directly with casting of a slab in a casting machine |
-
2009
- 2009-10-02 DE DE102009048165A patent/DE102009048165A1/en not_active Withdrawn
-
2010
- 2010-10-01 EP EP10765755.3A patent/EP2483014B1/en active Active
- 2010-10-01 TW TW099133486A patent/TWI576181B/en not_active IP Right Cessation
- 2010-10-01 WO PCT/EP2010/005995 patent/WO2011038925A1/en active Application Filing
- 2010-10-01 US US13/499,830 patent/US20120325425A1/en not_active Abandoned
- 2010-10-01 RU RU2012117180/02A patent/RU2532217C2/en not_active IP Right Cessation
- 2010-10-01 CN CN2010800451330A patent/CN102574201A/en active Pending
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4927509A (en) * | 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 (en) * | 1986-10-01 | 1988-04-21 | Sumitomo Heavy Ind Ltd | Twin belt type continuous casting machine |
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 (en) * | 1998-11-13 | 2000-05-25 | Schloemann Siemag Ag | Apparatus for strip casting steel melts has casting molds that run with the conveyor belt to shape the strip narrow sides |
Non-Patent Citations (2)
Title |
---|
Definition of "breaking point", http://www.thefreedictionary.com/breaking+points, 1991 * |
EPO machine translation of DE 19852275, 5/25/00 * |
Cited By (1)
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 |
---|---|
TW201113110A (en) | 2011-04-16 |
TWI576181B (en) | 2017-04-01 |
RU2012117180A (en) | 2013-11-10 |
CN102574201A (en) | 2012-07-11 |
EP2483014A1 (en) | 2012-08-08 |
WO2011038925A1 (en) | 2011-04-07 |
RU2532217C2 (en) | 2014-10-27 |
EP2483014B1 (en) | 2017-08-16 |
DE102009048165A1 (en) | 2011-04-07 |
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