EP3171997A1 - Verfahren zur herstellung eines metallischen produkts - Google Patents
Verfahren zur herstellung eines metallischen produktsInfo
- Publication number
- EP3171997A1 EP3171997A1 EP15725362.6A EP15725362A EP3171997A1 EP 3171997 A1 EP3171997 A1 EP 3171997A1 EP 15725362 A EP15725362 A EP 15725362A EP 3171997 A1 EP3171997 A1 EP 3171997A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- slab
- zone
- austenite
- ferrite
- cooling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title abstract description 3
- 239000002184 metal Substances 0.000 title abstract 2
- 238000001816 cooling Methods 0.000 claims abstract description 46
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 44
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 19
- 238000009749 continuous casting Methods 0.000 claims abstract description 17
- 238000003303 reheating Methods 0.000 claims abstract description 12
- 229910001338 liquidmetal Inorganic materials 0.000 claims abstract description 3
- 230000009466 transformation Effects 0.000 claims description 34
- 230000008569 process Effects 0.000 claims description 4
- 230000001939 inductive effect Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 3
- 238000005266 casting Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000005452 bending Methods 0.000 description 5
- 239000010949 copper Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 206010061217 Infestation Diseases 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000000844 transformation Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
-
- 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
-
- 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
- B22D11/1213—Accessories for subsequent treating or working cast stock in situ for heating or insulating strands
-
- 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
- B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
-
- 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
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
Definitions
- the invention relates to a method for producing a metallic product in which in a continuous casting liquid metal as a slab from a mold vertically downward in a conveying direction, guided along a strand guide and is deflected in the horizontal, the slab behind the continuous casting in a Oven is heated.
- a continuous casting liquid metal as a slab from a mold vertically downward in a conveying direction, guided along a strand guide and is deflected in the horizontal
- the slab behind the continuous casting in a Oven is heated.
- the invention has for its object to provide a generic method that allows a further reduction of surface cracks and thus improving the surface quality. In this case, a very fine and homogeneous structure in the material should be achieved.
- the solution of this object by the invention is characterized in that the method comprises the steps: in the conveying direction behind the mold in a first cooling zone: intensive cooling of the slab such that in the near-surface edge zone of the slab a structural transformation of austenite into ferrite takes place; b) in the conveying direction behind the first cooling zone in a first heating zone: reheating the slab in such a way that in the near-surface edge zone of the slab a structural transformation of ferrite into austenite takes place; c) in the conveying direction behind the first heating zone in a second cooling zone: intensive cooling of the slab in such a way that in the near-surface edge zone of the slab a structural transformation of austenite into ferrite takes place; d) in the conveying direction behind the second cooling zone in a second heating zone: reheating the slab in such a way that in the near-surface edge zone of the slab a structural transformation of ferrite into austenite takes place.
- At least one further intensive cooling of the slab can take place such that a structural transformation of austenite into ferrite occurs in the near-surface edge zone of the slab.
- at least one further heating of the slab can take place such that a structural transformation of ferrite into austenite occurs in the near-surface edge zone of the slab.
- At least one of the reheating of the slab can be done by heat balance in the slab by a heat flow from the interior of the slab to the slab surface is allowed.
- the last time heating of the slab can also be done in the oven and / or by inductive heating.
- the slab surface is preferably cooled in the above step a) and step c) to a temperature below the Ac1 temperature. Accordingly, it is preferably provided that the slab surface is heated in the above step b) and step d) to a temperature above the Ac 3 temperature.
- the last intensive cooling of the slab is carried out according to a possible embodiment of the invention, as soon as the slab is diverted into the horizontal.
- steps a) to c) can continue to take place while the slab is still oriented in the vertical direction.
- step b) takes place as soon as the slab has left the vertical.
- the invention is based on a multiple near-surface structural transformation in the continuous casting, in order to improve the surface quality of the slab.
- a possible embodiment of the method may be such that a first pass through the austenite to ferrite transition to austenite in the surface area of the slab is accomplished by intensive cooling at the top of the continuous run of the continuous casting line, followed by reheating of the near-surface area of the slab by normal or weak cooling in the central region of the strand guide.
- a second pass through the austenite to ferrite transition to austenite can be done before the bending driver by re-cooling and then rewarming.
- a third or second pass through the austenite to ferrite transition to austenite may occur before or after the straightening driver.
- the slab after leaving the mold within the strand guide of the continuous casting plant or after the shears or before entering the tunnel kiln or furnace, the slab should undergo a multi-stage heat treatment with the aim of setting a fine and homogeneous microstructure in the near-surface edge zone.
- the already solidified strand shell After leaving the mold, the already solidified strand shell usually has an austenitic, inhomogeneous solidification structure, depending on the steel composition.
- the near-surface edge zone of the steel strand is cooled below the mold to a temperature below the Ac1 point, so that in the surface-boundary layers a first transformation of austenite into ferrite takes place.
- the subsequent reheating of the ferritic, near-surface edge zone through the still existing core or heat of fusion from the slab interior to a temperature above AC3 results in a back transformation of the ferrite into austenite. Both transformation processes are associated with a refinement of the structure.
- inhomogeneities partial coarseness
- This "inheriting" of the structural inhomogeneities can be eliminated by repeated, ie two or more stages through the transformation austenite - ferrite - austenite, so that in the end a fine, homogeneous austenitic structure is present.
- the two-stage transformation of austenite-ferrite-austenite-ferrite-austenite is in particular realized by intensive cooling below the mold in the upper part of the strand guide of the continuous casting plant (austenite close to surface converts to ferrite) and by rewarming of the near-surface boundary layer the core heat of the slab in the middle part of the strand guide (near-surface ferrite converts to austenite).
- Fig. 2 shows schematically a continuous casting plant with illustration of a first
- FIG. 3 shows schematically a continuous casting plant with illustration of a second
- Embodiment of the invention and 4 schematically shows the representation of the microstructure in a near-surface edge zone of a Brannnne when passing through a method according to the invention.
- the present invention relates to a process which is carried out in a continuous casting plant for steel. It can be made conventional slabs, thin slabs or medium-thick slabs. 2, a first embodiment of the invention can be seen.
- the continuous casting plant 1 has a mold 3, under which a strand guide 4 is arranged. Through the strand guide 4 and the downstream rollers, the cast slab 2 is deflected from the vertical V in the horizontal H. The slab 2 is thereby conveyed in a conveying direction F. After the slab 2 is deflected in the horizontal H, it is conveyed into a furnace 5.
- the slab passes into a first heating zone 7, which is arranged in the conveying direction F behind the first cooling zone 6.
- a reheating of the slab 2 takes place such that in the near-surface edge zone of the slab 2, a structural transformation takes place back from ferrite to austenite.
- a second cooling zone 8 is connected downstream in the conveying direction F of the first heating zone 7.
- an intensive cooling of the slab 2 takes place, in such a way that in the near-surface edge zone of the slab 2 a microstructure transformation of austenite into ferrite takes place.
- the reference numeral 11 indicates that there are alternative positions for additional cooling bars for intensive cooling, in order to bring about a transformation from austenite to ferrite. Otherwise, it should be mentioned to the oven 5 that it can also be here that a conversion of ferrite to austenite can take place if a corresponding heating takes place.
- Fig. 2 it is shown that the continuous casting 1 is designed as a vertical bending plant, wherein the bending of the slab from the vertical to the horizontal takes place with a solid slab core.
- a continuous casting 1 is used as a vertical bending plant, wherein the bending is done with liquid slab core.
- the first heating zone 7 lies directly where the slab leaves the vertical V and is bent over.
- the oven 5 is provided.
- Fig. 4 is shown schematically how the microstructure changes when the respective transformations from austenite to ferrite and back done.
- the slab surface 10 is indicated and the microstructure is sketched near the surface of the slab.
- the respective grain diameters are indicated schematically and set in relation to each other.
- the last letters in the grain diameters D for three adjacent regions 1, 2 and 3 over the width of the slab indicates the respective status after the corresponding microstructural transformations.
- the grain size not only becomes smaller, but also uniform.
- grain diameters are according to the ASTM grain size table of ASTM Nos. -3 to 0.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Continuous Casting (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014214374.8A DE102014214374A1 (de) | 2014-07-23 | 2014-07-23 | Verfahren zur Herstellung eines metallischen Produkts |
PCT/EP2015/062060 WO2016012131A1 (de) | 2014-07-23 | 2015-06-01 | Verfahren zur herstellung eines metallischen produkts |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3171997A1 true EP3171997A1 (de) | 2017-05-31 |
EP3171997B1 EP3171997B1 (de) | 2019-08-07 |
Family
ID=53269499
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15725362.6A Active EP3171997B1 (de) | 2014-07-23 | 2015-06-01 | Verfahren zur herstellung eines metallischen produkts |
Country Status (4)
Country | Link |
---|---|
US (1) | US10894994B2 (de) |
EP (1) | EP3171997B1 (de) |
DE (1) | DE102014214374A1 (de) |
WO (1) | WO2016012131A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017213842A1 (de) * | 2017-08-08 | 2019-02-14 | Sms Group Gmbh | Verfahren und Anlage zum Stranggießen eines metallischen Produkts |
CN108907131B (zh) * | 2018-07-10 | 2020-07-03 | 邯郸钢铁集团有限责任公司 | 一种降低板坯连铸头尾坯表面裂纹的二冷控制方法 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5514173A (en) * | 1978-07-19 | 1980-01-31 | Nippon Steel Corp | Surface crack preventing method of steel cast billet containing nb and v |
JPS63112058A (ja) * | 1986-10-28 | 1988-05-17 | Mitsubishi Heavy Ind Ltd | 連続鋳造方法 |
ES2181698T3 (es) | 1993-10-29 | 2003-03-01 | Danieli Off Mecc | Metodo para el tratamiento termico de superficie en una maquina de colada continua y dispositivo correspondiente. |
JP2872034B2 (ja) * | 1994-01-11 | 1999-03-17 | 新日本製鐵株式会社 | 薄鋳片の製造方法 |
DE4416752A1 (de) | 1994-05-13 | 1995-11-16 | Schloemann Siemag Ag | Verfahren und Produktionsanlage zur Erzeugung von Warmbreitband |
DE19950502C1 (de) * | 1999-10-20 | 2000-11-16 | Thyssenkrupp Stahl Ag | Verfahren zum Herstellen eines Warmbandes |
JP3622687B2 (ja) | 2001-04-09 | 2005-02-23 | 住友金属工業株式会社 | 鋼の連続鋳造方法 |
DE102006056683A1 (de) | 2006-01-11 | 2007-07-12 | Sms Demag Ag | Verfahren und Vorrichtung zum Stranggießen |
JP4923650B2 (ja) * | 2006-03-20 | 2012-04-25 | Jfeスチール株式会社 | 連続鋳造鋳片の表面割れ防止方法 |
DE102008032970A1 (de) | 2008-07-10 | 2010-01-14 | Sms Siemag Aktiengesellschaft | Verfahren zum Abkühlen eines aus einer Stranggießkokille austretenden Stranges |
DE102009048567B4 (de) | 2008-10-23 | 2022-07-21 | Sms Group Gmbh | Verfahren und Anordnung zum Kühlen eines Gießstrangs in einer Stranggießanlage |
JP5516152B2 (ja) * | 2009-07-10 | 2014-06-11 | Jfeスチール株式会社 | 鋼の連続鋳造方法 |
-
2014
- 2014-07-23 DE DE102014214374.8A patent/DE102014214374A1/de not_active Withdrawn
-
2015
- 2015-06-01 WO PCT/EP2015/062060 patent/WO2016012131A1/de active Application Filing
- 2015-06-01 US US15/328,234 patent/US10894994B2/en active Active
- 2015-06-01 EP EP15725362.6A patent/EP3171997B1/de active Active
Also Published As
Publication number | Publication date |
---|---|
WO2016012131A1 (de) | 2016-01-28 |
US10894994B2 (en) | 2021-01-19 |
EP3171997B1 (de) | 2019-08-07 |
US20170211162A1 (en) | 2017-07-27 |
DE102014214374A1 (de) | 2016-01-28 |
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