EP1396550A1 - Procédé pour la fabrication d' une bande à chaud - Google Patents

Procédé pour la fabrication d' une bande à chaud Download PDF

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Publication number
EP1396550A1
EP1396550A1 EP02019315A EP02019315A EP1396550A1 EP 1396550 A1 EP1396550 A1 EP 1396550A1 EP 02019315 A EP02019315 A EP 02019315A EP 02019315 A EP02019315 A EP 02019315A EP 1396550 A1 EP1396550 A1 EP 1396550A1
Authority
EP
European Patent Office
Prior art keywords
hot
hot strip
max
temperature
tensile strength
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.)
Withdrawn
Application number
EP02019315A
Other languages
German (de)
English (en)
Inventor
Bertram Dr.-Ing. Ehrhardt
Thomas Dr.-Ing. Heller
Andreas Nuss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Stahl AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ThyssenKrupp Stahl AG filed Critical ThyssenKrupp Stahl AG
Priority to EP02019315A priority Critical patent/EP1396550A1/fr
Publication of EP1396550A1 publication Critical patent/EP1396550A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/009—Pearlite
    • 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
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling

Definitions

  • the invention relates to a method for producing a high-strength hot strip with particularly good formability.
  • Such hot strips are for example in the Automotive industry for the production of body, frame or chassis components used at high Force absorption have a low weight.
  • a hot strip intended for this purpose is from the US 5,470,529 known.
  • the well-known steel strip shows as necessary components (in% by weight) 0.05 - 0.3% C, up to 2.5% Si, 0.05 - 4% Mn, more than 0.1% but less than 2.0% Al and the rest iron and production-related unavoidable impurities, the sum of Contents of Si and Al at least 0.5%, but at most Is 3.0%.
  • the known steel can also be used Copper, nickel, chrome, Ca, Zr, rare earth metals, niobium, Contain titanium and vanadium.
  • a steel assembled in this way becomes one shed unspecified material, which then to a temperature above the Ar3 temperature Temperature warmed up and at hot rolling end temperatures of 780 - 840 ° C is hot rolled. After hot rolling is done a cooling at cooling rates of 10 - 50 ° C / s to one low reel temperature, which is 300 - 450 ° C.
  • the invention relates to a method for producing a high-strength hot strip with particularly good formability.
  • Such hot strips are for example in the Automotive industry for the production of body, frame or chassis components used at high Force absorption have a low weight.
  • a hot strip intended for this purpose is from the US 5,470,529 known.
  • the well-known steel strip shows as necessary components (in% by weight) 0.05 - 0.3% C, up to 2.5% Si, 0.05 - 4% Mn, more than 0.1% but less than 2.0% Al and the rest iron and production-related unavoidable impurities, the sum of Contents of Si and Al at least 0.5%, but at most Is 3.0%.
  • the known steel can also be used Copper, nickel, chrome, Ca, Zr, rare earth metals, niobium, Contain titanium and vanadium.
  • a steel assembled in this way becomes one shed unspecified material, which then to a temperature above the Ar3 temperature Temperature warmed up and at hot rolling end temperatures of 780 - 840 ° C is hot rolled. After hot rolling is done a cooling at cooling rates of 10 - 50 ° C / s to one low reel temperature, which is 300 - 450 ° C.
  • the known steel is made after the shedding and heating at one Hot rolling end temperature of 780 - 940 ° C hot rolled. it is followed by a multi-stage cooling, within which the hot strip initially with cooling rates of at least 10 ° C / s cooled to a temperature of 600 - 700 ° C then cool in air for 2 to 10 seconds before it with a cooling rate of at least 20 ° C / s to a Is coiled temperature is cooled, which is 300 to 450 ° C.
  • the object of the invention was a simple to create an uncomplicated procedure to be carried out, with which a high-strength hot strip can be produced has a very good formability.
  • Hot strips produced according to the invention thus have both in terms of their strength as well as in terms of their Formability properties that are more conventional Steel strips exhibiting TRIP properties are similar. Unlike in the production of such hot strips with TRIP properties, however, are according to the invention no complex measures to generate a high Residual austenite content required. Instead, the Invention targeted the formation of perlite, which in the Generation of prior art relating to TRIP steels is undesirable. Nevertheless, this results in the invention Process a product that is all based on strength and Deformability requirements met.
  • the invention thus represents a simplified one Manufacturing process available that works on everyone Hot strip mill is a high-strength, easily deformable hot strip of high quality. Different from the stand However, no special cooling patterns are used in technology Setting the desired material properties needed.
  • the alloy of the steel according to the invention is so matched that the individual contained in the steel Elements have an optimal impact on strength and Deformability of the hot strip obtained. So is in that the sum of the contents of silicon, manganese and At least aluminum in the steel used according to the invention 2% by weight, preferably at least 2.5% by weight, but at most 5% by weight, preferably at most 4% by weight, ensures that the desired strength level is reached safely.
  • the silicon content can do this too In favor of each other strengthening Alloy components limited to 0.1 - 2.0 wt .-% become.
  • the strength can be according to the invention produced hot strips also by contents of chromium, molybdenum, Copper and nickel can be increased in processed steel. These elements cause solidification Mixed crystal formation.
  • Hot strip according to the invention can be particularly advantageous manufacture with a so-called "casting and rolling system".
  • a so-called "casting and rolling system” at Such a facility is in a continuous Pour the steel workflow into thin slabs. This go through an annealing immediately afterwards then hot rolled to hot strip, cooled and coiled.
  • the Advantage of such in one go continuously ongoing hot strip production exists in relation to the Invention in that the thin slabs until entering the hot rolling scale remains at a temperature level, where the contained in the processed steel Micro elements are in solution. This opens the Possibility to use their favorable influence in the course of Cooling, reeling and possibly other Target heat treatments.
  • the invention is a range of the reel temperature provided that ranges from 540 to 750 ° C.
  • the desired ferritic-pearlitic range arises Structure safely.
  • particularly good Work results arise with the inventive Working mode when relatively high reel temperatures in the range from 580 - 620 ° C, in particular 600 - 620 ° C, to get voted.
  • Prefers contains the structure of the hot strip obtained at least 35% ferrite, typically 60-70%.
  • Hot strip after reeling a heat treatment undergo at least at Austenitizing temperature warmed up and then is slowly cooled. This treatment is preferred in a hood furnace, in which the respective Hot strip used as a coil or in a plate form can be. It is beneficial if the hot strip is under in a low oxygen atmosphere is heat treated to a deterioration in surface quality as a result a reaction of the alloy components of the hot strip with to avoid oxygen contained in the environment.
  • the hot strips are with one at least 50 ° C / s cooling rate to the Coil temperature HT cooled and coiled.
  • Diag. 1 to 3 are those with filled symbols Characteristic values marked for a Hot rolling temperature ET of 920 ° C rolled hot strips have been determined, and by the unfilled Symbols marks those property values that the generated with a hot rolling end temperature of 870 ° C. Hot strips have been measured.
  • Diag. 1 are for those explained in the above Hot strips produced from the molten steel S1 in Longitudinal values of the tensile strength Rm (symbolized by circles) and the yield point Re (symbolized by triangles) over the respective Coiler temperature HT applied.
  • Diag. 2 are the elongation at break for the same hot strips A5 (symbolized by circles) and the uniform expansion Agl (symbolized by triangles) above the reel temperature HT applied.
  • Diag. 3 is for those produced from the molten steel S1 Hot strips the product Rm * A5 from tensile strength Rm and Elongation at break A5 recorded above the reel temperature HT.
  • Diag. 4 to Diag. 6 are for those from the Steel melt S2 produced hot strips for the cross and Longitudinal values determined the respective yield strength values Rp0.2 and tensile strength Rm (Diag. 4), the uniform elongation Ag and elongation at break A5 (Diag. 5) as well as the product Rm * Ag from tensile strength Rm and uniform elongation Ag and des Product Rm * A5 from tensile strength Rm and elongation at break A5 (Diag. 6) plotted above the reel temperature HT.
  • the filled symbols are the in Longitudinal direction and through the unfilled symbols each values determined in the transverse direction are marked.
  • melts S4 - S9 are closed Slab cast and at temperatures from 1250 to 1270 ° C been reheated before being at a Hot rolling end temperature ET to hot strips with a thickness d have been hot rolled. After hot rolling are the hot strips with a cooling rate Kr accelerated to one reached at the end of the cooling section Intermediate temperature TZ has been cooled. On the way between the end of the cooling section and the reel device are the Hot strips cooled to the reel temperature HT, with which they have been wound into coils.
  • Table 3 shows the hot strip production parameters set from the melts S4 to S9 "Hot strip thickness d", "Hot roll end temperature ET”, “Cooling rate Kr ",” intermediate temperature TZ “and” reel temperature HT " specified.
  • Table 4 shows those for the melts S4 to S9 generated hot strips mechanical properties "upper Yield strength ReH “,” lower yield strength ReL “, “Tensile strength Rm”, “uniform elongation Ag”, “elongation at break A80 “and the product Rm * A80 from tensile strength Rm and Elongation at break A80 specified.
  • hot strips can be produced reliably in the production according to the invention, in which the product Rm * A80 is regularly above 15,000 MPa *%.
  • the advantageous combination of high strength and elongation values expressed in this characteristic value makes hot strips according to the invention well suited for the production of components by forming which are subjected to high loads in practical use.
EP02019315A 2002-08-28 2002-08-28 Procédé pour la fabrication d' une bande à chaud Withdrawn EP1396550A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02019315A EP1396550A1 (fr) 2002-08-28 2002-08-28 Procédé pour la fabrication d' une bande à chaud

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02019315A EP1396550A1 (fr) 2002-08-28 2002-08-28 Procédé pour la fabrication d' une bande à chaud

Publications (1)

Publication Number Publication Date
EP1396550A1 true EP1396550A1 (fr) 2004-03-10

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EP02019315A Withdrawn EP1396550A1 (fr) 2002-08-28 2002-08-28 Procédé pour la fabrication d' une bande à chaud

Country Status (1)

Country Link
EP (1) EP1396550A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1918404A1 (fr) * 2006-10-30 2008-05-07 ThyssenKrupp Steel AG Procédé pour la fabrication de produits plats à partir d'un acier à plusieurs phases allié en aluminium
EP1918406A1 (fr) * 2006-10-30 2008-05-07 ThyssenKrupp Steel AG Procédé pour la fabrication de produits plats à partir d'un acier à plusieurs phases micro-allié en bore
EP1918405A1 (fr) * 2006-10-30 2008-05-07 ThyssenKrupp Steel AG Procédé pour la fabrication de produits plats à partir d'un acier à plusieurs phases allié en silice
DE102017209982A1 (de) * 2017-06-13 2018-12-13 Thyssenkrupp Ag Hochfestes Stahlblech mit verbesserter Umformbarkeit
CN109023105A (zh) * 2018-09-25 2018-12-18 首钢集团有限公司 一种汽车结构用热轧带钢及制造方法
CN110484815A (zh) * 2019-08-08 2019-11-22 邯郸钢铁集团有限责任公司 540Mpa级汽车轮辐用540LF钢带及其生产方法
EP2821520B1 (fr) * 2013-07-03 2020-11-11 ThyssenKrupp Steel Europe AG Procédé de revêtement de produits plats en acier avec une couche de protection métallique
US11225697B2 (en) 2014-12-19 2022-01-18 Nucor Corporation Hot rolled light-gauge martensitic steel sheet and method for making the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5470529A (en) * 1994-03-08 1995-11-28 Sumitomo Metal Industries, Ltd. High tensile strength steel sheet having improved formability
JPH10219387A (ja) * 1997-02-04 1998-08-18 Sumitomo Metal Ind Ltd 加工性に優れた熱延高張力鋼板及びその製造方法
WO2002048410A1 (fr) * 2000-12-16 2002-06-20 Thyssenkrupp Stahl Ag Procede de production de feuillards ou de toles a chaud en acier microallie

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5470529A (en) * 1994-03-08 1995-11-28 Sumitomo Metal Industries, Ltd. High tensile strength steel sheet having improved formability
JPH10219387A (ja) * 1997-02-04 1998-08-18 Sumitomo Metal Ind Ltd 加工性に優れた熱延高張力鋼板及びその製造方法
WO2002048410A1 (fr) * 2000-12-16 2002-06-20 Thyssenkrupp Stahl Ag Procede de production de feuillards ou de toles a chaud en acier microallie

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 13 30 November 1998 (1998-11-30) *

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010508437A (ja) * 2006-10-30 2010-03-18 ティッセンクルップ スチール アクチェンゲゼルシャフト ケイ素合金化多相鋼からフラット鋼生成物を製造する方法
WO2008052920A1 (fr) * 2006-10-30 2008-05-08 Thyssenkrupp Steel Ag Procédé de fabrication de produits plats en acier à partir d'un acier multiphase allié à de l'aluminium
EP1918404A1 (fr) * 2006-10-30 2008-05-07 ThyssenKrupp Steel AG Procédé pour la fabrication de produits plats à partir d'un acier à plusieurs phases allié en aluminium
WO2008052921A1 (fr) * 2006-10-30 2008-05-08 Thyssenkrupp Steel Ag Procédé de fabrication de produits plats en acier à partir d'un acier multiphase allié à du silicium
CN101528966B (zh) * 2006-10-30 2011-06-15 蒂森克虏伯钢铁股份公司 由铝合金化多相钢制备扁钢产品的方法
WO2008052919A1 (fr) * 2006-10-30 2008-05-08 Thyssenkrupp Steel Ag Procédé de fabrication de produits plats en acier à partir d'un acier multiphase micro-allié à du bore
JP2010508435A (ja) * 2006-10-30 2010-03-18 ティッセンクルップ スチール アクチェンゲゼルシャフト ボロンミクロ合金化多相鋼からフラット鋼生成物を製造する方法
CN101528970B (zh) * 2006-10-30 2012-10-03 蒂森克虏伯钢铁股份公司 由硼微合金化多相钢制备扁钢产品的方法
EP1918405A1 (fr) * 2006-10-30 2008-05-07 ThyssenKrupp Steel AG Procédé pour la fabrication de produits plats à partir d'un acier à plusieurs phases allié en silice
EP1918406A1 (fr) * 2006-10-30 2008-05-07 ThyssenKrupp Steel AG Procédé pour la fabrication de produits plats à partir d'un acier à plusieurs phases micro-allié en bore
JP2010508436A (ja) * 2006-10-30 2010-03-18 ティッセンクルップ スチール アクチェンゲゼルシャフト アルミニウム合金化多相鋼からフラット鋼生成物を製造する方法
EP2821520B1 (fr) * 2013-07-03 2020-11-11 ThyssenKrupp Steel Europe AG Procédé de revêtement de produits plats en acier avec une couche de protection métallique
US11225697B2 (en) 2014-12-19 2022-01-18 Nucor Corporation Hot rolled light-gauge martensitic steel sheet and method for making the same
DE102017209982A1 (de) * 2017-06-13 2018-12-13 Thyssenkrupp Ag Hochfestes Stahlblech mit verbesserter Umformbarkeit
CN109023105A (zh) * 2018-09-25 2018-12-18 首钢集团有限公司 一种汽车结构用热轧带钢及制造方法
CN110484815A (zh) * 2019-08-08 2019-11-22 邯郸钢铁集团有限责任公司 540Mpa级汽车轮辐用540LF钢带及其生产方法
CN110484815B (zh) * 2019-08-08 2021-08-20 邯郸钢铁集团有限责任公司 540MPa级汽车轮辐用540LF钢带及其生产方法

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