EP2094876A1 - Verfahren zur herstellung eines stahlbandes aus einem höherfesten dualphasenstahl - Google Patents
Verfahren zur herstellung eines stahlbandes aus einem höherfesten dualphasenstahlInfo
- Publication number
- EP2094876A1 EP2094876A1 EP07817796A EP07817796A EP2094876A1 EP 2094876 A1 EP2094876 A1 EP 2094876A1 EP 07817796 A EP07817796 A EP 07817796A EP 07817796 A EP07817796 A EP 07817796A EP 2094876 A1 EP2094876 A1 EP 2094876A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steel
- hot
- steel strip
- strip
- cold
- 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
-
- 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
-
- 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the working steps
- C21D8/1222—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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties characterised by the working steps
- C21D8/1233—Cold rolling
-
- 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
-
- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
Definitions
- the invention relates to a method for producing a cold-rolled or hot-rolled steel strip from a high-strength dual-phase steel with excellent forming properties, in particular for lightweight vehicle construction according to the preamble of claim 1.
- Dual phase steels which are characterized by very good formability and simultaneously high strength values, are being used more and more frequently in this area. Dual phase steels have a predominantly ferritic-martensitic structure.
- cold-rolled steel strips are annealed by recrystallization in a continuous annealing process to form a thin sheet which is easy to form.
- the furnace parameters (throughput speed, annealing temperature, cooling rate) are set according to the required microstructure and the mechanical-technological properties.
- the cold strip is heated in the continuous annealing furnace to a temperature such that the required ferritic-martensitic microstructure formation occurs during cooling.
- the annealing treatment is usually carried out in a continuous annealing furnace upstream of the galvanizing bath.
- the required dual-phase structure is also occasionally set for the hot-rolled strip during the annealing treatment in the continuous furnace, in order to be able to realize the required mechanical properties on the basis of a homogenous austenite microstructure.
- the known steels have corresponding contents z. B. on Cr, Mo, Nb or B.
- the costly elements Cr and Mo have a strong effect on the production costs of the dual-phase steel.
- a narrow process window in this context means that, depending on the thickness of the strip to be annealed, the throughput speed has to be adjusted in order to achieve a homogeneous temperature distribution in the strip and during cooling the required dual-phase structure and the mechanical-technological properties.
- the required strip properties can be achieved with the same furnace parameters even with different thicknesses of strips to be annealed.
- the invention is therefore based on the object of specifying another cost-effective alloy concept for a high-strength steel with dual-phase structure, with which the process window for the continuous annealing of hot or cold strips can be extended so that in addition to different thickness bands and steel bands with over tape length and possibly Bandwidth varying thickness can be produced with the most homogeneous mechanical and technological properties.
- this object is achieved by a steel with the following
- Process is heated to a temperature in the range of 820 to 1000 0 C, preferably 840 to 1000 ° C, and the annealed steel strip then from the annealing temperature with a
- Cooling rate between 15 and 30 ° C / s is cooled.
- the inventive high-strength dual-phase steel for lightweight vehicle construction is characterized by the fact that with a targeted addition of V and Nb waiving the costly alloying elements Mo or Cr, such a high conversion inertia is achieved, which leads to the fact that during the continuous annealing also in bands with over Band length or width of varying thickness of a fully austenitic matrix with very high process reliability the required dual-phase microstructure with homogeneous mechanical-technological properties can be adjusted.
- the steel according to the invention offers the advantage of a significantly enlarged process window in comparison to the known steels. This results in increased process reliability during continuous annealing or hot-dip galvanizing of cold and hot strip with dual-phase structure. Thus, both hot-dip galvanized, as well as only pass-annealed hot or Cold strips more homogeneous mechanical-technological properties are guaranteed in the band. This applies to the continuous annealing of successive bands with different strip thickness and also in particular for strips with varying sheet thickness over strip length or width.
- it is a dual-phase steel with about 20% martensite embedded in the strength class of about 800 MPa, in particular for continuous hot-dip galvanizing and for use in a continuous annealing plant.
- the fine granularity of the microstructure is adjusted according to the invention via the formation of nitrides or carbonitrides as a function of the N content of the steel, and the mechanical and technological properties are influenced.
- the field of application of the steel for rolling with flexible sheet thicknesses in the longitudinal and transverse direction to the rolling direction is opened by its insensitivity to process fluctuations during the heat treatment.
- This insensitivity is caused by the use of Nb and especially V, which require a conversion-free or conversion-free zone during cooling.
- the steel according to the invention has a V content of at least 0.02% and an Nb content of at least 0.01%.
- Nb also acts as a grain refining element, with the amount of Nb addition being adjusted to the actual C and N content of the steel.
- the addition of V is also adjusted to the contents of C and N, but the amount of addition is adjusted so that enough V is kept in solution to achieve a sufficiently high conversion inertia. If the aim is to achieve the best possible conversion behavior and thus the widest possible process window in the continuous annealing, the V content is at least 0.06 to 0.10% and the Nb content is more than 0.02 to 0.05%. A further increase in the contents of V or Nb then brings no further improvement with regard to a further delayed transformation of the steel and thus to the width of the process window in the continuous annealing.
- the band to be annealed is first heated to a temperature such that a fully austenitic structure is present.
- the annealing temperatures are for the steel according to the invention between about 820 and about 1000 0 C, depending on the specific alloy composition.
- the content of ferrite and (remainder) austenite during cooling is retained until after the "galvanizing" process step, and the remaining austenite part then converts completely to martensite on further cooling.
- the galvanizing parameters can vary over a wide range
- the plate thickness is between 60 and 120 m / min and the cooling rates before and after the zinc bath are relatively low at 10 to 30 ° C / sec.
- the material produced can be processed both as a cold strip and as a hot strip, in the dressed and untreated and also in the heat-treated state (intermediate annealing) via a hot-dip galvanizing line or pure continuous annealing plant.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Electromagnetism (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102006054300A DE102006054300A1 (de) | 2006-11-14 | 2006-11-14 | Höherfester Dualphasenstahl mit ausgezeichneten Umformeigenschaften |
| PCT/DE2007/002074 WO2008058530A1 (de) | 2006-11-14 | 2007-11-13 | Verfahren zur herstellung eines stahlbandes aus einem höherfesten dualphasenstahl |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2094876A1 true EP2094876A1 (de) | 2009-09-02 |
| EP2094876B1 EP2094876B1 (de) | 2014-04-16 |
Family
ID=39128645
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07817796.1A Active EP2094876B1 (de) | 2006-11-14 | 2007-11-13 | Verfahren zur herstellung eines stahlbandes aus einem höherfesten dualphasenstahl |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20100000634A1 (de) |
| EP (1) | EP2094876B1 (de) |
| KR (1) | KR20090089311A (de) |
| DE (1) | DE102006054300A1 (de) |
| RU (1) | RU2443787C2 (de) |
| WO (1) | WO2008058530A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111247258A (zh) * | 2017-10-06 | 2020-06-05 | 德国沙士基达板材有限公司 | 高强度多相钢和用于由这种多相钢制造钢带的方法 |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010034161B4 (de) | 2010-03-16 | 2014-01-02 | Salzgitter Flachstahl Gmbh | Verfahren zur Herstellung von Werkstücken aus Leichtbaustahl mit über die Wanddicke einstellbaren Werkstoffeigenschaften |
| DE102011010040B3 (de) | 2011-02-02 | 2012-08-02 | Salzgitter Flachstahl Gmbh | Verfahren und Einrichtung zum Erzeugen eines gegossenen Bandes aus Stahl mit über den Bandquerschnitt und die Bandlänge einstellbaren Werkstoffeigenschaften |
| DE102011056847B4 (de) | 2011-12-22 | 2014-04-10 | Thyssenkrupp Rasselstein Gmbh | Stahlblech zur Verwendung als Verpackungsstahl sowie Verfahren zur Herstellung eines Verpackungsstahls |
| DE102012002079B4 (de) | 2012-01-30 | 2015-05-13 | Salzgitter Flachstahl Gmbh | Verfahren zur Herstellung eines kalt- oder warmgewalzten Stahlbandes aus einem höchstfesten Mehrphasenstahl |
| DE102012006017A1 (de) * | 2012-03-20 | 2013-09-26 | Salzgitter Flachstahl Gmbh | Hochfester Mehrphasenstahl und Verfahren zur Herstellung eines Bandes aus diesem Stahl |
| DE102012006941B4 (de) | 2012-03-30 | 2013-10-17 | Salzgitter Flachstahl Gmbh | Verfahren zur Herstellung eines Bauteils aus Stahl durch Warmumformen |
| RU2491357C1 (ru) * | 2012-05-10 | 2013-08-27 | Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Национальный исследовательский технологический университет "МИСиС" | Способ производства листовой стали |
| WO2014093744A1 (en) * | 2012-12-13 | 2014-06-19 | Thyssenkrupp Steel Usa, Llc | Process for making cold-rolled dual phase steel sheet |
| DE102013101847B3 (de) * | 2013-02-25 | 2014-03-27 | Thyssenkrupp Rasselstein Gmbh | Verfahren zur Herstellung eines korrosionsbeständigen Stahlblechs |
| KR101749201B1 (ko) | 2013-05-06 | 2017-06-20 | 잘쯔기터 플래시슈탈 게엠베하 | 경량 강으로 부품을 제조하기 위한 방법 |
| DE102013013067A1 (de) * | 2013-07-30 | 2015-02-05 | Salzgitter Flachstahl Gmbh | Siliziumhaltiger, mikrolegierter hochfester Mehrphasenstahl mit einer Mindestzugfestigkeit von 750 MPa und verbesserten Eigenschaften und Verfahren zur Herstellung eines Bandes aus diesem Stahl |
| CN105420605A (zh) * | 2015-11-30 | 2016-03-23 | 钢铁研究总院 | 一种超低屈强比冷轧双相钢及其制造方法 |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5669359A (en) * | 1979-10-16 | 1981-06-10 | Kobe Steel Ltd | Composite structure type high strength cold rolled steel sheet |
| RU2018542C1 (ru) * | 1988-01-29 | 1994-08-30 | Штальверке Пайне-Зальцгиттер АГ | Способ изготовления холоднокатаной ленты или листа и стальной лист |
| JP3365632B2 (ja) * | 1991-03-15 | 2003-01-14 | 新日本製鐵株式会社 | 成形性の良好な高強度冷延鋼板と溶融亜鉛メッキ高強度冷延鋼板およびそれらの製造方法 |
| US5356494A (en) * | 1991-04-26 | 1994-10-18 | Kawasaki Steel Corporation | High strength cold rolled steel sheet having excellent non-aging property at room temperature and suitable for drawing and method of producing the same |
| US5545270A (en) * | 1994-12-06 | 1996-08-13 | Exxon Research And Engineering Company | Method of producing high strength dual phase steel plate with superior toughness and weldability |
| US5531842A (en) * | 1994-12-06 | 1996-07-02 | Exxon Research And Engineering Company | Method of preparing a high strength dual phase steel plate with superior toughness and weldability (LAW219) |
| JPH09291310A (ja) * | 1996-04-26 | 1997-11-11 | Nkk Corp | 耐震建築用鋼材の製造方法 |
| FR2790009B1 (fr) * | 1999-02-22 | 2001-04-20 | Lorraine Laminage | Acier dual-phase a haute limite d'elasticite |
| EP1096029B1 (de) * | 1999-04-21 | 2006-01-25 | JFE Steel Corporation | Hochfeste heisstauchzinkbeschichtete stahlplatte mit hervorragenden duktilitätseigenschaften und verfahren zu deren herstellung |
| DE19936151A1 (de) * | 1999-07-31 | 2001-02-08 | Thyssenkrupp Stahl Ag | Höherfestes Stahlband oder -blech und Verfahren zu seiner Herstellung |
| KR100572179B1 (ko) * | 1999-10-22 | 2006-04-18 | 제이에프이 스틸 가부시키가이샤 | 가공성 및 도금성이 우수한 고강도 용융아연도금 강판 및그 제조방법 |
| FR2830260B1 (fr) * | 2001-10-03 | 2007-02-23 | Kobe Steel Ltd | Tole d'acier a double phase a excellente formabilite de bords par etirage et procede de fabrication de celle-ci |
| FR2833617B1 (fr) * | 2001-12-14 | 2004-08-20 | Usinor | Procede de fabrication de toles laminees a froid a tres haute resistance d'aciers dual phase micro-allies |
-
2006
- 2006-11-14 DE DE102006054300A patent/DE102006054300A1/de not_active Ceased
-
2007
- 2007-11-13 EP EP07817796.1A patent/EP2094876B1/de active Active
- 2007-11-13 RU RU2009122381/02A patent/RU2443787C2/ru active
- 2007-11-13 US US12/514,716 patent/US20100000634A1/en not_active Abandoned
- 2007-11-13 KR KR1020097009714A patent/KR20090089311A/ko not_active Ceased
- 2007-11-13 WO PCT/DE2007/002074 patent/WO2008058530A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2008058530A1 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111247258A (zh) * | 2017-10-06 | 2020-06-05 | 德国沙士基达板材有限公司 | 高强度多相钢和用于由这种多相钢制造钢带的方法 |
| CN111247258B (zh) * | 2017-10-06 | 2022-04-26 | 德国沙士基达板材有限公司 | 高强度多相钢和用于由这种多相钢制造钢带的方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008058530A1 (de) | 2008-05-22 |
| DE102006054300A1 (de) | 2008-05-15 |
| RU2009122381A (ru) | 2010-12-20 |
| EP2094876B1 (de) | 2014-04-16 |
| RU2443787C2 (ru) | 2012-02-27 |
| US20100000634A1 (en) | 2010-01-07 |
| KR20090089311A (ko) | 2009-08-21 |
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