EP1453984B1 - Verfahren zum herstellen von warmband oder -blech aus einem mikrolegierten stahl - Google Patents
Verfahren zum herstellen von warmband oder -blech aus einem mikrolegierten stahl Download PDFInfo
- Publication number
- EP1453984B1 EP1453984B1 EP01270630A EP01270630A EP1453984B1 EP 1453984 B1 EP1453984 B1 EP 1453984B1 EP 01270630 A EP01270630 A EP 01270630A EP 01270630 A EP01270630 A EP 01270630A EP 1453984 B1 EP1453984 B1 EP 1453984B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- hot strip
- hot
- weight
- raw material
- 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.)
- Expired - Lifetime
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
- C21D8/021—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 involving particular fabrication steps or treatments of ingots or slabs
-
- 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
- C21D8/0221—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 characterised by the working steps
- C21D8/0226—Hot 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
- C22C38/04—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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
Definitions
- the invention relates to a method for producing Hot strip or sheet of micro-alloyed steel.
- the hot strips are made of a steel that is in % By weight not more than 0.3% C, not more than 0.5% Si, 0.3 2.0% Mn, ⁇ 0.05% Al, 0.01-0.02% Nb, 0.01-0.2% V and optionally 0.01-0.2% Mo and 0.01-0.2% Ti, balance Contains iron and unavoidable impurities.
- This raw material produced in this steel is used in a Roll end temperature of at least 750 ° C to hot strip finish rolled, which immediately afterwards on a cooled to a maximum of 650 ° C reel temperature becomes. Subsequently, the hot strip is a final Subjected to heat treatment.
- the object of the invention is, starting from the above-explained prior art cost-effective method for producing hot strips indicate that even with larger thicknesses a high Possess strength.
- a microalloyed steel is produced which, in addition to micro-alloying elements (in% by weight) 0, 05-0.12% C, 0.2-0.5% Si, 1.5-2.2% Mn, ⁇ 0.025% P, ⁇ 0.01% S, balance iron and unavoidable impurities, to a starting material like slabs, thin slabs or blooms, potted; the starting material is heated to a temperature of 1300-1350 ° C; the heated starting material is pre-rolled at a degree of deformation of 36% to 43%; the pre-rolled starting material is thermo-mechanically hot rolled to a hot strip at a rolling end temperature above the Ac 3 temperature; the hot strip is cooled at a cooling rate of at least 15 ° C / s to a coiler temperature of at least 590 ° C and at most 630 ° C, and finally
- the inventive dimensioning of the contents of the individual alloying elements and the targeted tuning of the rolling end temperature, the cooling rate and the coiling temperature hot strips which have the highest strengths even at thicknesses of more than 8 mm.
- the yield strength is still at least 700 N / mm 2 .
- a yield strength of at least 760 N / mm 2 can be achieved.
- a supplementary heat treatment following the cooling in the coil is not required.
- the high strength of steel produced according to the invention is due to the combined use of the elimination, Fine grain and solid solution hardening achieved. there lead the selected contents of the alloying elements C and Mn to the desired solid solution hardening.
- the Precipitates of micro-alloying elements Ti, V and Nb completely dissolved.
- the at the subsequent pre-deformation set Deformations lead to a fine, even dispersed and recrystallized austenite grain.
- the excellent strength values make According to the invention produced hot strip in particular suitable for the production of load-bearing components Motor vehicles, such as heavily loaded Longitudinal beams of trucks.
- the steel contains at least one of Micro-alloying elements V, Mo, Ti, Nb in the following Held (in weight%) 0.08 - 0.12% V, 0.1 - 0.2% Mo, 0.08 - 0.11% Ti and 0.05 - 0.06% Nb.
- the Al content should be between 0.02 and 0.05% by weight.
- the micro-alloying element niobium hinders this Austenite grain. In addition, it hinders the Recrystallization of the austenite grains during the Hot rolling.
- Recrystallization during hot rolling is also avoided by hot rolling according to the invention at temperatures above the Ac 3 temperature.
- the austenite / ferrite transformation occurs during strip cooling behind the last stand of the hot rolling mill. In this way, a recrystallized, fine-grained microstructure with low Perlitan turnover is obtained.
- the ferrite grains have a size of 11 to 14 ASTM.
- the cooling rate of at least 15 ° C / s is chosen to the hot strip of the preferably at least 840 ° C hot rolling end temperature sufficient cool down to the reel temperature quickly.
- the precipitation hardness maximum by the Microalloying Ti and V and Nb achieved. This effect can be achieved particularly reliably if the reel temperature in the range of 600 ° C to 620 ° C lies.
- Hot strips whose yield strength is at least 700 N / mm 2 even with a thickness of 16 mm, can be produced particularly reliably with the method according to the invention if the steel (in weight%) is 0.06-0.08% C, 0, 2 - 0.3% Si, 1.95 - 2.1% Mn, ⁇ 0.02% P and ⁇ 0.005% S contains. In this case, if present, the Ti content should not be more than 0.1% by weight.
- hot strips whose yield strength is at least 760 N / mm 2 at a thickness of 13 mm can thereby be reliably produced by the steel (in weight%) being 0.10-0.12% C, 0 , 4 - 0.5% Si, 1.95 - 2.1% Mn, ⁇ 0.02% P, ⁇ 0.005% S.
- the steel preferably has at least one of the micro-alloying elements V, Mo, Ti, Nb in the following contents (in% by weight): 0.08-0.10% V, 0.1-0.2% Mo, 0.09 0.11% Ti, 0.05-0.06% Nb.
- the steel used in the invention can production-related or to the expression of certain Properties optionally one or more of the elements N, Cu, Ni, Sn, B or As, where the sum of the Content of these elements not more than 0.1 wt .-% is.
- the Holding time during heating of slabs at least 135 minutes to ensure a safe warmth of the To ensure starting material.
- the hot strip A emerging from the finish rolling scale was immediately after a reel temperature of 610 ° C water cooled and reeled. In the course of Water cooling were cooling rates of at least 15 ° C / s achieved.
- the emerging from the finishing roll scale hot strip B was just like the hot strip A immediately after water cooled to a reel temperature of 610 ° C and coiled. In the course of the water cooling were again Cooling speeds of 15 ° C / s achieved.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Coating With Molten Metal (AREA)
- Laminated Bodies (AREA)
Description
- C:
- 0,075 %
- Si:
- 0,254 %
- Mn:
- 2,011 %
- P:
- 0,015 %
- S:
- 0,003 %
- Al:
- 0,02 %
- N:
- 0,007 %
- Cu:
- 0,017 %
- Cr:
- 0,039 %
- Ni:
- 0,021 %
- Sn:
- 0,004 %
- V:
- 0,098 %
- Mo:
- 0,121 %
- Ti:
- 0,080 %
- Nb:
- 0,060 %
- B:
- 0,0003 %
- As:
- 0,002 %
wurde zu Brammen vergossen. Die Brammen wurden anschließend bei einer Temperatur von 1350 °C für 135 Minuten vorgewärmt und dann bei einem zwischen 36 % und 43 % liegenden Verformungsgrad auf eine Dicke von 55 mm vorgewalzt. Die vorgewalzten Brammen wurden in einer Fertigwalzstaffel auf eine Dicke von 16 mm thermomechanisch fertig warmgewalzt. Im Zuge dieses Warmwalzens wurden die Temperaturführung und Umformgrade so aufeinander abgestimmt, daß das fertig warmgewalzte Warmband A eine für den Verwendungszweck optimale Gefügestruktur aufweist. Die Walzendtemperatur betrug dabei 840 °C.
| Reh [N/mm2] | Rm [N/mm2] | Reh/Rm | A5 [%] | A80 [%] | |
| A1 | 725 | 830 | 87,3 | 19,5 | 19,6 |
| A2 | 701 | 816 | 85,9 | 21,5 | 21,6 |
| A3 | 712 | 824 | 86,4 | 20,2 | 20,2 |
| A4 | 753 | 842 | 89,5 | 21,5 | 20,8 |
| A5 | 763 | 841 | 90,7 | 19,9 | 19,1 |
| A6 | 772 | 846 | 91,2 | 21,0 | 20,3 |
| A7 | 761 | 840 | 90,6 | 20,2 | 19,4 |
| A8 | 760 | 858 | 88,5 | 19,0 | 18,4 |
| Probe | Richtung | Prüftemp. [K] | Kv [J] |
| A9 | Längs | 233 | 86,6 |
| A10 | Quer | 233 | 49,5 |
| A11 | Längs | 233 | 86,0 |
| A12 | Quer | 233 | 58,6 |
- C:
- 0,115 %
- Si:
- 0,449 %
- Mn:
- 1,988 %
- P:
- 0,019 %
- S:
- 0,003 %
- Al:
- 0,03 %
- N:
- 0,007 %
- Cu:
- 0,017 %
- Cr:
- 0,037 %
- Ni:
- 0, 02 %
- Sn:
- 0,003 %
- V:
- 0,092 %
- Mo:
- 0,108 %
- Ti:
- 0,101 %
- Nb:
- 0,055 %
- B:
- 0,0003 %
- As:
- 0,003 %
zusammengesetzte Stahlschmelze wurde zu Brammen vergossen. Die Brammen wurden wie beim Beispiel des Warmbands A bei einer Temperatur von 1350 °C für 135 Minuten vorgewärmt, anschließend auf eine Dicke von 55 mm vorgewalzt und in einer Fertigwalzstaffel bei einer Walzendtemperatur von 840 °C warmgewalzt. Die Dicke des fertig gewalzten Warmbandes betrug 13 mm.
| Reh [N/mm2] | Rm [N/mm2] | Reh/Rm | A5 [%] | A80 [%] | |
| B1 | 767 | 899 | 85,3 | 15,5 | 15,4 |
| B2 | 771 | 893 | 86,3 | 18,1 | 18,1 |
| B3 | 783 | 916 | 85,5 | 15,8 | 15,8 |
| B4 | 796 | 875 | 91,0 | 18,5 | 18,0 |
| B5 | 784 | 872 | 89,9 | 19,0 | 18,4 |
| B6 | 792 | 871 | 90,9 | 19,9 | 19,3 |
| B7 | 794 | 890 | 89,1 | 19,9 | 19,2 |
| B8 | 776 | 871 | 89,0 | 18,6 | 18,1 |
| Probe | Richtung | Prüftemp. [K] | Kv [J] |
| B9 | Längs | 233 | 55,5 |
| B10 | Quer | 233 | 36,2 |
| B11 | Längs | 233 | 78,4 |
| B12 | Quer | 233 | 37,4 |
Claims (10)
- Verfahren zum Herstellen von Warmband oder -blech,bei dem ein mikrolegierter Stahl, welcher neben mindestens einem der Mikrolegierungselemente V, Mo, Ti, Nb in folgenden Gehalten in Gewichts-% V: 0,08 - 0,12%, Mo: 0,1 - 0,2%, Ti: 0,08 - 0,11%, Nb: 0,05 - 0,06%, folgende Elemente in Gew.-% enthält :C: 0,05 - 0,12 %,Si: 0,2 - 0,5 %,Mn: 1,5 - 2,2 %,Al: 0,02 - 0,05 %,P: ≤ 0,025 %,S: ≤ 0,01 %, sowie wahlweise eines oder mehrere der Elemente N, Cu, Ni, Sn, B und As, Rest Eisen und unvermeidbare Verunreinigungen enthält, wobei die Summe der wahlweise vorhandenen Elemente ≤ 0,1 Gew.-% beträgt, zu einem Vormaterial wie Brammen, Vorblöcke oder Dünnbrammen, vergossen wird,bei dem das Vormaterial auf eine Temperatur von 1300 - 1350 °C erwärmt wird,bei dem das erwärmte Vormaterial mit einem Verformungsgrad von 36 % bis 43 % vorgewalzt wird,bei dem das vorgewalzte Vormaterial thermomechanisch bei einer oberhalb der Ac3 - Temperatur liegenden Walzendtemperatur zu einem Warmband warmgewalzt wird,bei dem das Warmband mit einer Abkühlgeschwindigkeit von mindestens 15 °C/s auf eine mindestens 590 °C und höchstens 630 °C betragende Haspeltemperatur gekühlt wird,mit der das abgekühlte Warmband schließlich gehaspelt wird.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Warmband oder -blech bei einer Dicke von mehr als 8 mm eine Mindeststreckgrenze von 700 N/mm2 besitzt.
- Verfahren nach Anspruche 1 oder 2, dadurch gekennzeichnet, daß der Stahl (in Gewichts-%)
- C:
- 0, 06 - 0,08 %,
- Si:
- 0,2 - 0,3 %,
- Mn:
- 1,95 - 2,1 %,
- Al:
- 0,02 - 0,05 %,
- P:
- ≤ 0,02 %,
- S:
- ≤ 0,005 %
- Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß der Ti-Gehalt max. 0,1 Gewichts-% beträgt.
- Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Stahl (in Gewichts-%)
- C:
- 0,10 - 0,12 %,
- Si:
- 0, 4 - 0,5 %,
- Mn:
- 1,95 - 2,1 %,
- Al:
- 0,02 - 0,05 %,
- P:
- ≤ 0,02 %,
- S:
- ≤ 0,005 %
- Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß der Stahl mindestens eines der Mikrolegierungselemente V, Mo, Ti, Nb in folgenden Gehalten (in Gewichts-%) enthält:
- V:
- 0,08 - 0,10 %,
- Mo:
- 0,1 - 0,2 %,
- Ti:
- 0,09 - 0,11 %,
- Nb:
- 0,05 - 0,06 %.
- Verfahren nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß das Warmband oder -blech bei einer Dicke von 13 mm eine Mindeststreckgrenze von 760 N/mm2 besitzt.
- Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß als Vormaterial Brammen verarbeitet werden und die Haltezeit während der Erwärmung der Brammen mindestens 135 Minuten beträgt.
- Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß daß die Walzendtemperatur mindestens 840 °C beträgt.
- Verfahren nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, daß die Haspeltemperatur mindestens 600 °C und höchstens 620 °C beträgt.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10062919 | 2000-12-16 | ||
| DE10062919A DE10062919A1 (de) | 2000-12-16 | 2000-12-16 | Verfahren zum Herstellen von Warmband oder -blech aus einem mikrolegierten Stahl |
| PCT/EP2001/014829 WO2002048410A1 (de) | 2000-12-16 | 2001-12-15 | Verfahren zum herstellen von warmband oder -blech aus einem mikrolegierten stahl |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1453984A1 EP1453984A1 (de) | 2004-09-08 |
| EP1453984B1 true EP1453984B1 (de) | 2005-04-13 |
| EP1453984B8 EP1453984B8 (de) | 2005-07-27 |
Family
ID=7667534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01270630A Expired - Lifetime EP1453984B8 (de) | 2000-12-16 | 2001-12-15 | Verfahren zum herstellen von warmband oder -blech aus einem mikrolegierten stahl |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20040040633A1 (de) |
| EP (1) | EP1453984B8 (de) |
| AT (1) | ATE293175T1 (de) |
| DE (2) | DE10062919A1 (de) |
| ES (1) | ES2240337T3 (de) |
| WO (1) | WO2002048410A1 (de) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1396550A1 (de) * | 2002-08-28 | 2004-03-10 | ThyssenKrupp Stahl AG | Verfahren zum Herstellen eines Warmbandes |
| PL1918406T3 (pl) * | 2006-10-30 | 2009-10-30 | Thyssenkrupp Steel Ag | Sposób wytwarzania płaskich produktów stalowych z wielofazowej stali mikrostopowej z borem |
| ATE432372T1 (de) * | 2006-10-30 | 2009-06-15 | Thyssenkrupp Steel Ag | Verfahren zum herstellen von stahl-flachprodukten aus einem ein komplexphasen-gefüge bildenden stahl |
| FI20095528L (fi) * | 2009-05-11 | 2010-11-12 | Rautaruukki Oyj | Menetelmä kuumavalssatun nauhaterästuotteen valmistamiseksi sekä kuumavalssattu nauhaterästuote |
| FI122143B (fi) * | 2009-10-23 | 2011-09-15 | Rautaruukki Oyj | Menetelmä korkealujuuksisen sinkityn muotovalmisteen valmistamiseksi sekä muotovalmiste |
| JP5365673B2 (ja) * | 2011-09-29 | 2013-12-11 | Jfeスチール株式会社 | 材質均一性に優れた熱延鋼板およびその製造方法 |
| US10301698B2 (en) | 2012-01-31 | 2019-05-28 | Jfe Steel Corporation | Hot-rolled steel sheet for generator rim and method for manufacturing the same |
| US11225697B2 (en) | 2014-12-19 | 2022-01-18 | Nucor Corporation | Hot rolled light-gauge martensitic steel sheet and method for making the same |
| CN111519105B (zh) * | 2020-05-12 | 2021-06-15 | 首钢集团有限公司 | 一种汽车构件钢及其制备方法、汽车构件 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2133744B2 (de) * | 1971-07-07 | 1973-07-12 | August Thyssen-Hütte AG, 4100 Duisburg | Die verwendung eines vollberuhigten stahles fuer gegenstaende aus warmgewalztem band |
| CA1003311A (en) * | 1972-12-31 | 1977-01-11 | Hiroshi Takechi | High tensile strength structural steel and the manufacture thereof |
| JPS58136719A (ja) * | 1982-02-05 | 1983-08-13 | Nippon Kokan Kk <Nkk> | 高強度熱延鋼板の製造方法 |
| JPS61281814A (ja) * | 1985-06-06 | 1986-12-12 | Kobe Steel Ltd | バウシンガ−効果感受性の低い高強度熱延鋼板の製造方法 |
| JPS63223130A (ja) * | 1987-03-13 | 1988-09-16 | Kawasaki Steel Corp | 加工性に優れた高張力熱延鋼板の製造方法 |
| JPH059572A (ja) * | 1991-07-08 | 1993-01-19 | Sumitomo Metal Ind Ltd | 加工性に優れた熱延鋼板の製造法 |
| FR2688009B1 (fr) * | 1992-02-28 | 1994-05-27 | Lorraine Laminage | Procede d'elaboration d'une tole d'acier et tole d'acier obtenue par ce procede. |
| JP3767132B2 (ja) * | 1997-11-11 | 2006-04-19 | Jfeスチール株式会社 | 高延性を有し、かつ材質均一性に優れた高強度熱延鋼板の製造方法 |
-
2000
- 2000-12-16 DE DE10062919A patent/DE10062919A1/de not_active Withdrawn
-
2001
- 2001-12-15 WO PCT/EP2001/014829 patent/WO2002048410A1/de not_active Ceased
- 2001-12-15 EP EP01270630A patent/EP1453984B8/de not_active Expired - Lifetime
- 2001-12-15 US US10/398,795 patent/US20040040633A1/en not_active Abandoned
- 2001-12-15 DE DE50105924T patent/DE50105924D1/de not_active Expired - Lifetime
- 2001-12-15 AT AT01270630T patent/ATE293175T1/de active
- 2001-12-15 ES ES01270630T patent/ES2240337T3/es not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| ES2240337T3 (es) | 2005-10-16 |
| WO2002048410A1 (de) | 2002-06-20 |
| EP1453984A1 (de) | 2004-09-08 |
| ATE293175T1 (de) | 2005-04-15 |
| DE10062919A1 (de) | 2002-06-27 |
| US20040040633A1 (en) | 2004-03-04 |
| DE50105924D1 (de) | 2005-05-19 |
| EP1453984B8 (de) | 2005-07-27 |
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