EP2880188A1 - Verfahren zur erzeugung von stahlstreifen aus kohlenstoffstahl - Google Patents

Verfahren zur erzeugung von stahlstreifen aus kohlenstoffstahl

Info

Publication number
EP2880188A1
EP2880188A1 EP13744440.2A EP13744440A EP2880188A1 EP 2880188 A1 EP2880188 A1 EP 2880188A1 EP 13744440 A EP13744440 A EP 13744440A EP 2880188 A1 EP2880188 A1 EP 2880188A1
Authority
EP
European Patent Office
Prior art keywords
max
steel
weight
hot
molten steel
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
Application number
EP13744440.2A
Other languages
English (en)
French (fr)
Other versions
EP2880188B1 (de
Inventor
Richard MOSTERT
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.)
Tata Steel Nederland Technology BV
Original Assignee
Tata Steel Nederland Technology BV
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=48914212&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2880188(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Tata Steel Nederland Technology BV filed Critical Tata Steel Nederland Technology BV
Priority to EP13744440.2A priority Critical patent/EP2880188B1/de
Publication of EP2880188A1 publication Critical patent/EP2880188A1/de
Application granted granted Critical
Publication of EP2880188B1 publication Critical patent/EP2880188B1/de
Revoked legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • 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
    • 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
    • C21D8/0236—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
    • C22C38/06—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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese

Definitions

  • the invention relates to a method for producing steel strip of carbon steel using a thin slab caster such as a direct sheet plant (DSP) or direct sheet caster (DSC), in which the steel is continuously cast and in the same installation semi-continuously rolled, or a conventional slab caster with a hot connect to a hot rolling installation.
  • a thin slab caster such as a direct sheet plant (DSP) or direct sheet caster (DSC)
  • DSP direct sheet plant
  • DSC direct sheet caster
  • a thin slab caster such as a DSP or DSC for continuously casting the carbon steel or a conventional slab caster with a hot connect to a hot rolling installation.
  • a method for producing steel strip of carbon steel using a thin slab caster such as a DSP or DSC for continuously casting the carbon steel or a conventional slab caster with a hot connect to a hot rolling installation comprising the following steps:
  • the inventors have found that aluminium is the most suitable element to increase the carbon equivalent of the steel, such that steels having a carbon content between 0.06 and 0.17 weight % can be used in a thin slab caster or conventional caster with hot connect outside the peritectic range.
  • the addition of Al to a hitherto peritectic steel does not impair the performance of the product.
  • the addition of aluminium improves the formability of the steel by the TRIP effect.
  • Manganese is added as austenite stabiliser and to give strength to the steel. It is unusual to add more than 3 weight % manganese in view of casting problems.
  • the optional elements mentioned above are added when such is desired to provide a specific steel quality. These elements are usually added to change the mechanical properties and the purpose for which the steel type is used. Calcium is added to improve the castability and forms calciumaluminates with Al.
  • the steel contains a more limited amount of carbon, for instance
  • the steel contains a more limited amount of manganese, for instance 0.1 - 3.0 weight % Mn, preferably 0.5 - 2.5 weight % Mn, and more preferably 1.0 - 2.0 weight % Mn.
  • a more limited amount of manganese are generally used in casting advanced high strength steels.
  • the aluminium content of the steel can be more limited, for instance when the carbon content is more limited or when other elements are added.
  • the steel contains 0.3 - 1.5 weight % Al, more preferably 0.3 - 1.0 weight % Al, still more preferably 0.5 - 0.8 weight % Al.
  • the steel contains 0.1 - 1.5 weight % Si, preferably 0.1 - 1.0 weight % Si, more preferably 0.2 - 0.5 weight % Si.
  • the amount of silicon in steel is kept relatively low.
  • Chromium is often added to certain steel types for strengthening the steel. Due to its price, usually only limited amounts are added in carbon steels. According to a preferred composition the steel contains 0.1 - 1.0 weight % Cr, more preferably 0.3 - 0.8 weight % Cr.
  • the molten steel has the composition of an advanced high strength steel, such as a dual phase steel.
  • such dual phase steels have a composition containing the following elements (in weight %): 0.06 - 0.17 C
  • the elements in the dual phase steels as shown above are even more limited to reach certain strength levels, such as DP600, DP 800, DP 1000 or DP 1200. Apart from the amount of aluminium, the amount of the elements are known for dual phase steels that are not produced on a DSP, CSP or conventional slab caster with a hot connect.
  • a hot rolled steel strip of carbon steel produced with the method according to the first aspect of the invention.
  • a cold rolled and annealed steel strip of carbon steel produced by cold rolling and annealing the hot rolled steel strip according to the second aspect of the invention.
  • a steel type according to the invention has been cast, having the following composition in weight %:
  • This steel type has been cast in the direct sheet plant (DSP) using a standard moulding powder in the mould, with a casting speed of approximately 4.5 m/min. After temperature equalisation in the tunnel oven, the slabs have been rolled in the seven- stand rolling equipment of the DSP to an end thickness of 3 mm.
  • DSP direct sheet plant
  • a typical standard steel type cast on the DSP has the following composition in weight %:
  • the comparison between the standard steel type and the steel type according to the invention shows that the steel type according to the invention has a higher content of all the elements in the steel. This is partly due to the fact that it is the intention to produce an advanced high strength steel, in this case a dual phase steel, after cold rolling of the hot rolled strip.
  • the carbon content of 0.090 weight % in the steel type according to the invention is such that without additional measures a peritectic steel would be formed during solidification of the steel in the mould of the DSP, which transformation from the ⁇ - phase to the ⁇ -phase in the iron-carbon diagram causes changes in the volume of the steel leading to the loss of contact between the cast steel and the mould. This results in an irregular cooling of the steel slabs, in turn leading to cracks.
  • the steel type according to the invention can be processed in the DSP without risks of surface cracking and damage to the installation due to break-outs.
  • the steel produced in accordance with the invention can be a hot rolled steel strip or a cold rolled and annealed steel strip, which in the latter case can be hot dip galvanised or galvannealed.

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)
  • Heat Treatment Of Sheet Steel (AREA)
  • Metal Rolling (AREA)
EP13744440.2A 2012-07-30 2013-07-29 Verfahren zur erzeugung von stahlstreifen aus kohlenstoffstahl Revoked EP2880188B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13744440.2A EP2880188B1 (de) 2012-07-30 2013-07-29 Verfahren zur erzeugung von stahlstreifen aus kohlenstoffstahl

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP12005543 2012-07-30
PCT/EP2013/002241 WO2014019673A1 (en) 2012-07-30 2013-07-29 Method for producing steel strip of carbon steel
EP13744440.2A EP2880188B1 (de) 2012-07-30 2013-07-29 Verfahren zur erzeugung von stahlstreifen aus kohlenstoffstahl

Publications (2)

Publication Number Publication Date
EP2880188A1 true EP2880188A1 (de) 2015-06-10
EP2880188B1 EP2880188B1 (de) 2016-07-27

Family

ID=48914212

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13744440.2A Revoked EP2880188B1 (de) 2012-07-30 2013-07-29 Verfahren zur erzeugung von stahlstreifen aus kohlenstoffstahl

Country Status (6)

Country Link
EP (1) EP2880188B1 (de)
KR (1) KR102099488B1 (de)
CN (1) CN104603297A (de)
ES (1) ES2586507T3 (de)
PL (1) PL2880188T3 (de)
WO (1) WO2014019673A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106987769B (zh) * 2017-03-29 2018-08-03 苏州浩焱精密模具有限公司 一种高硬度精密蚀刻刀模
DE102017131253A1 (de) 2017-12-22 2019-06-27 Voestalpine Stahl Gmbh Verfahren zum Erzeugen metallischer Bauteile mit angepassten Bauteileigenschaften
CN109913755B (zh) * 2019-03-22 2020-09-18 山东钢铁股份有限公司 一种包晶钢及其制备方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19911287C1 (de) * 1999-03-13 2000-08-31 Thyssenkrupp Stahl Ag Verfahren zum Erzeugen eines Warmbandes
US6962631B2 (en) * 2000-09-21 2005-11-08 Nippon Steel Corporation Steel plate excellent in shape freezing property and method for production thereof
JP3908954B2 (ja) * 2001-06-05 2007-04-25 新日本製鐵株式会社 形状凍結性に優れたフェライト系薄鋼板およびその製造方法
DE10161465C1 (de) 2001-12-13 2003-02-13 Thyssenkrupp Stahl Ag Verfahren zum Herstellen von Warmband
JP4819489B2 (ja) * 2005-11-25 2011-11-24 Ｊｆｅスチール株式会社 一様伸び特性に優れた高強度鋼板およびその製造方法
JP5167487B2 (ja) 2008-02-19 2013-03-21 Ｊｆｅスチール株式会社 延性に優れる高強度鋼板およびその製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2014019673A1 *

Also Published As

Publication number Publication date
PL2880188T3 (pl) 2016-11-30
KR102099488B1 (ko) 2020-04-10
WO2014019673A1 (en) 2014-02-06
KR20150038499A (ko) 2015-04-08
CN104603297A (zh) 2015-05-06
EP2880188B1 (de) 2016-07-27
ES2586507T3 (es) 2016-10-14

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