EP0970256A1 - Warmwalzen von stahlband - Google Patents
Warmwalzen von stahlbandInfo
- Publication number
- EP0970256A1 EP0970256A1 EP98912456A EP98912456A EP0970256A1 EP 0970256 A1 EP0970256 A1 EP 0970256A1 EP 98912456 A EP98912456 A EP 98912456A EP 98912456 A EP98912456 A EP 98912456A EP 0970256 A1 EP0970256 A1 EP 0970256A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- rolled
- ferrite
- rolling
- hot
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
-
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0231—Warm rolling
-
- 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
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
-
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0273—Final recrystallisation annealing
-
- 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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/02—Austenitic rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/04—Ferritic rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/16—Two-phase or mixed-phase rolling
-
- 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 continuously cast and / or pre-rolled strips in the austenite area with homogeneous structures and properties from unalloyed and low-alloy steel by continuous hot rolling in two or more passes in the austenite area, starting from a temperature T> Ar 3 + 30 ° C. , with a total degree of deformation e h > ⁇ 30% and then in several passes in the ferrite area with a total degree of deformation e h > 60% and reels.
- the object of the invention is to largely dispense with space-consuming, time-consuming and cost-intensive additional installations by reinforcing the cooling section before and between the finishing stands.
- This object is achieved in the generic method in that the rolling stock in the finished batch is intensively cooled after each pass in the austenite area and the intensive cooling is ended after the ferrite conversion has been completed.
- Fig. 1 the time-temperature profile of the rolling method according to the invention is compared with the prior art.
- the method according to the invention can advantageously be used for steels with (in mass%) max. 0.06% C, max. 1.5% Si, max. 0.6% Mn, 0.005 to 0.25% P, max. 0.03% S, max. Carry out 0.008% N and optionally up to a total of 1.5% of one or more of the elements Al, Ti, Nb, Zr, Cu, Sn, balance iron, including unavoidable impurities.
- the material and forming-technically difficult two-phase area austenite / ferrite is included in the rolling process, but easily overcome by intensive in-line cooling of the rolling stock.
- the continuous rolling according to the invention in the austenite, in the two-phase and in the ferrite area can be used both in a multi-stand finishing train used for conventional austenite rolling and in finishing runs of hot strip mills which process thin slabs directly from the casting heat.
- the temperature setting in the rolling stock is carried out precisely and precisely through the variable and step-by-step use of cooling groups, which are available, for example, in the scale washer before entering the finishing line and behind the finishing stands.
- the hot strip is preferably regulated by means of high-pressure water to an inlet temperature in the range of T> Ar 3 + 30 ° C.
- cooling during continuous finishing rolling offers advantages that have a positive effect on product quality.
- a structural state of high uniformity is achieved over the bandwidth, the strip thickness and the strip length.
- the hot strip produced according to the invention has a structure which is homogeneous over the cross section. The inhomogeneity across the thickness that is usually observed in conventional production is eliminated. The same applies to the coarse grain hems in the area near the surface and in particular in the band edge area.
- the excretion state is also favorably influenced.
- the new process is widely variable.
- the temperature range of the two-phase area can be positioned differently in the pass schedule through the targeted use of several cooling groups in front of and in the finishing line. Cooling in the course of finish rolling accelerates the austenite / ferrite conversion kinetics and advantageously narrows the temperature of the two-phase area. This saves commuting time that would otherwise be necessary to lower the temperature between the roughing and finishing lines.
- the rolling temperatures can also be set accurately and very precisely, taking into account the Ar 3 temperature and in particular the Ar x temperature.
- This enables ferrite rolling easily over Ari as well as below Ari.
- Ferrite rolling near Ari offers the opportunity to save rolling forces and thus drive high pass reductions, which are necessary, for example, for thin strips below 2.5 mm and even below 1 mm final thickness.
- the low rolling forces are advantageously used to produce strips of large widths.
- the combination of high finish rolling temperature with high coiling temperature leads to a soft hot strip, i.e. to a hot strip with largely softened structural condition.
- a reel is advantageously used at a short distance of, for example, 20 m to the outlet of the last finishing stand.
- This hot strip has properties that are required when using hot strip directly as a material.
- hot strips are either softened by a subsequent annealing process or further processed by cold rolling in order to then be heat-treated with or without a combination of surface finishing.
- the aforementioned combinations of final rolling temperature with reel temperature offer a variety of options for intervening in the property profile of the hot strips for direct consumption or in the property profile of the cold strip produced therefrom, which is easy to prove with texture images.
- the hot strip is advantageously finish-rolled at a temperature in the range between the final transformation temperature of the ferrite and up to 200 ° C. below, preferably less than 100 ° C. below, and then coiled at a temperature> 650 ° C.
- the hot strip can be brought to a coiling temperature at a core cooling rate of over 10 K / s at the latest 2 s after the end of the rolling with liquid and / or gaseous cooling media, such as water and / or water-air mixture be cooled, which is more than 200 ° C below the Ari temperature.
- liquid and / or gaseous cooling media such as water and / or water-air mixture be cooled
- the stated advantages apply both to hot strip for direct consumption and to the cold strip produced from it by subsequent cold rolling with a degree of rolling of> _ 30%, preferably> 60%, and recrystallizing annealing in a continuous process or in a bell annealer.
- Thin strips with a final thickness of less than 3 mm should preferably be rolled using lubricants in the ferrite area.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Metal Rolling (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19712616 | 1997-03-26 | ||
DE19712616A DE19712616C2 (de) | 1997-03-26 | 1997-03-26 | Warmwalzen von Stahlband |
PCT/EP1998/001338 WO1998042881A1 (de) | 1997-03-26 | 1998-03-07 | Warmwalzen von stahlband |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0970256A1 true EP0970256A1 (de) | 2000-01-12 |
EP0970256B1 EP0970256B1 (de) | 2001-02-07 |
Family
ID=7824623
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98912456A Expired - Lifetime EP0970256B1 (de) | 1997-03-26 | 1998-03-07 | Warmwalzen von stahlband |
Country Status (11)
Country | Link |
---|---|
US (1) | US6284069B1 (de) |
EP (1) | EP0970256B1 (de) |
JP (1) | JP2001520707A (de) |
KR (1) | KR100506541B1 (de) |
AT (1) | ATE199101T1 (de) |
AU (1) | AU728353B2 (de) |
CA (1) | CA2284635A1 (de) |
DE (2) | DE19712616C2 (de) |
ES (1) | ES2155285T3 (de) |
GR (1) | GR3035532T3 (de) |
WO (1) | WO1998042881A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT509707B1 (de) * | 2010-05-04 | 2011-11-15 | Siemens Vai Metals Tech Gmbh | Verfahren zum warmwalzen von stahlbändern und warmwalzstrasse |
DE102016114579B4 (de) | 2016-08-05 | 2021-12-09 | Technische Universität Dresden | Harvesterkopf für die Holzernte und Messeranordnung |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE807881R (fr) * | 1973-11-27 | 1974-05-27 | Centre Rech Metallurgique | Procede pour la fabrication de toles pour emboutissage |
DD160457A1 (de) * | 1981-06-11 | 1983-08-03 | Florin Stahl Walzwerk | Verfahren zur thermomechanischen behandlung von walzstahl |
DE3437637A1 (de) * | 1984-10-13 | 1986-04-24 | Thyssen Stahl AG, 4100 Duisburg | Verfahren zur herstellung von grobblech |
NL8702050A (nl) * | 1987-09-01 | 1989-04-03 | Hoogovens Groep Bv | Werkwijze en inrichting voor de vervaardiging van bandvormig vervormingsstaal met goede mechanische en oppervlakte-eigenschappen. |
NL8802892A (nl) * | 1988-11-24 | 1990-06-18 | Hoogovens Groep Bv | Werkwijze voor het vervaardigen van vervormingsstaal en band vervaardigd daarmee. |
IT1244295B (it) * | 1990-07-09 | 1994-07-08 | Giovanni Arvedi | Processo ed impianto per l'ottenimento di nastri di acciaio avvolti, aventi caratteristiche di laminati a freddo ottenuti direttamente in linea di laminazione a caldo |
NL9100911A (nl) * | 1991-03-22 | 1992-10-16 | Hoogovens Groep Bv | Inrichting en werkwijze voor het vervaardigen van warmgewalst staal. |
DE19520832A1 (de) * | 1994-10-20 | 1996-04-25 | Mannesmann Ag | Verfahren und Vorrichtung zur Herstellung von Stahlband mit Kaltwalzeigenschaften |
CA2202616C (en) * | 1994-10-20 | 2001-01-23 | Fritz-Peter Pleschiutschnigg | Process and device for producing a steel strip with the properties of a cold-rolled product |
DE19600990C2 (de) * | 1996-01-14 | 1997-12-18 | Thyssen Stahl Ag | Verfahren zum Warmwalzen von Stahlbändern |
-
1997
- 1997-03-26 DE DE19712616A patent/DE19712616C2/de not_active Expired - Fee Related
-
1998
- 1998-03-07 US US09/381,892 patent/US6284069B1/en not_active Expired - Fee Related
- 1998-03-07 DE DE59800464T patent/DE59800464D1/de not_active Expired - Lifetime
- 1998-03-07 ES ES98912456T patent/ES2155285T3/es not_active Expired - Lifetime
- 1998-03-07 JP JP54480498A patent/JP2001520707A/ja active Pending
- 1998-03-07 WO PCT/EP1998/001338 patent/WO1998042881A1/de active IP Right Grant
- 1998-03-07 KR KR10-1999-7008813A patent/KR100506541B1/ko active IP Right Grant
- 1998-03-07 EP EP98912456A patent/EP0970256B1/de not_active Expired - Lifetime
- 1998-03-07 AU AU67286/98A patent/AU728353B2/en not_active Ceased
- 1998-03-07 AT AT98912456T patent/ATE199101T1/de active
- 1998-03-07 CA CA002284635A patent/CA2284635A1/en not_active Abandoned
-
2001
- 2001-03-08 GR GR20010400371T patent/GR3035532T3/el not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9842881A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE59800464D1 (de) | 2001-03-15 |
ATE199101T1 (de) | 2001-02-15 |
EP0970256B1 (de) | 2001-02-07 |
AU6728698A (en) | 1998-10-20 |
US6284069B1 (en) | 2001-09-04 |
DE19712616C2 (de) | 1999-07-15 |
JP2001520707A (ja) | 2001-10-30 |
KR100506541B1 (ko) | 2005-08-08 |
ES2155285T3 (es) | 2001-05-01 |
KR20010005742A (ko) | 2001-01-15 |
DE19712616A1 (de) | 1998-10-01 |
WO1998042881A1 (de) | 1998-10-01 |
GR3035532T3 (en) | 2001-06-29 |
CA2284635A1 (en) | 1998-10-01 |
AU728353B2 (en) | 2001-01-04 |
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