EP0966547A1 - Procede permettant de fabriquer un feuillard d'acier a resistance et a malleabilite elevees - Google Patents

Procede permettant de fabriquer un feuillard d'acier a resistance et a malleabilite elevees

Info

Publication number
EP0966547A1
EP0966547A1 EP98916911A EP98916911A EP0966547A1 EP 0966547 A1 EP0966547 A1 EP 0966547A1 EP 98916911 A EP98916911 A EP 98916911A EP 98916911 A EP98916911 A EP 98916911A EP 0966547 A1 EP0966547 A1 EP 0966547A1
Authority
EP
European Patent Office
Prior art keywords
steel
strip
hot
hot strip
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.)
Granted
Application number
EP98916911A
Other languages
German (de)
English (en)
Other versions
EP0966547B1 (fr
Inventor
Bernhard Engl
Günter STICH
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
Publication of EP0966547A1 publication Critical patent/EP0966547A1/fr
Application granted granted Critical
Publication of EP0966547B1 publication Critical patent/EP0966547B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • C21D2211/002—Bainite
    • 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
    • C21D2211/008—Martensite

Definitions

  • the invention relates to a method for producing a steel strip with a high strength of at least 900 MPa and good formability.
  • the characteristic values relevant for the forming can be obtained from the tensile test with great meaning for practice.
  • the elongation at break and the n-value are important measures.
  • the n-value is characteristic of the deformability under a stretching stress. This is the predominant deformation mechanism in most sheet metal parts of a vehicle.
  • the n-value is in relatively good agreement with the yield point ratio, which is also a measure of the strength of a material that can be used in practice.
  • the highest possible values for the elongation at break (A) and the strengthening value (n value) are aimed for.
  • the object of the invention is to develop strip steels which have a high strength, paired with good formability and high component strength.
  • the cooling speed on the outfeed roller table is at least 30 ° C / s and the reel temperature is 300 to 600 ° C.
  • the particular economic importance of the method according to the invention consists in the possibility of production as a hot strip in thicknesses below 2.0 mm, e.g. 1.5 mm.
  • the manufacturing process thus does not necessarily require the complex manufacturing process of cold strip production with the additional steps of cold rolling and final annealing.
  • This material concept also includes the option of surface finishing applied at the factory. For example, an electrolytically deposited zinc layer can be applied. The enormous improvement in corrosion protection through a zinc coating can be assumed as a known fact. It is also known that high-strength steels tend to become brittle due to hydrogen absorption during the electrolytic galvanizing process. It could be shown that the steel strip according to the invention remains free from these dreaded galvanizing problems. The meaning of the alloying elements and the manufacturing parameters are described below.
  • Carbon is required for structural hardening and for the formation of fine precipitates.
  • the content should be limited to 0.1 to 0.2%.
  • Silicon increases the hardness of the mixed crystal, which requires at least 0.3%. For reasons of weldability and to avoid unfavorable scale formation, the content should be limited to 0.6%.
  • Manganese at a content of at least 1.5% delays the conversion and causes the formation of hard conversion products. In order to avoid impermissibly strong micro segregations, the content should be max. Limit 2.0%.
  • Phosphorus can be used to further increase solid-solution strengthening, but should not exceed 0.08% for reasons of weldability.
  • Chromium promotes the formation of a bainite-rich final structure in at least 0.3%. In order not to delay the conversion too much, its content should be limited to max. Be limited to 0.80%.
  • Titanium or zirconium can be used to form fine precipitates with a hardening effect.
  • the effect clearly drops at levels above 0.2%.
  • the maximum value is therefore set at 0.2%.
  • Niobium can also be used for precipitation hardening. At least 0.04% should preferably be added. For reasons of effectiveness, the content is limited to max. 0.08% set.
  • Boron improves hardenability at levels in the range of 0.0005 to 0.005%. According to the current state of knowledge, it is used for this purpose in martensitic steel. It has surprisingly been found that boron in the present case also causes a significant increase in strength in the bainitic basic structure with only a slight reduction in formability.
  • the final roll temperature should be in the range of homogeneous austenite and therefore not below 800 ° C, on the one hand to ensure sufficiently low resistance to deformation and on the other hand to keep deformation-induced precipitations low.
  • the cooling conditions should be selected so that a conversion to pearlite is avoided and the conversion takes place largely in the bainite stage. Shares of martensite can contribute to further solidification. In addition, solidification should be achieved by separating the finest particles. This requires a cooling of the final roll temperature with a cooling rate of at least 30 ° C / s. This cooling process must be ended at a temperature below 600 ° C by winding the strip on a reel and then cooling it in the coil.
  • Table 1 shows the chemical compositions of the strip steels 1 and 2 and steel 3, a comparative martensitic steel, produced according to the invention.
  • Table 2 shows the characteristic mechanical properties of the strip steels 1 and 2 produced according to the invention and of the comparative steel 3, which was tempered to the values given in Table 2 by a subsequent heat treatment.
  • Table 3 shows the influence of low reel temperature and a subsequent heat treatment on the properties of a strip steel produced according to the invention of the composition of steel 1 in Table 1.
  • Low reel temperatures of preferably 330 ° C can significantly increase the strength properties, see Example 4 in Table 3.
  • Another object of the invention is to achieve the advantageous effect of a subsequent heat treatment. It has surprisingly been found that the forming properties can be further increased by the thermal treatment of the steel strip produced according to the invention in the temperature range between 500 and 850 ° C. Examples 4, 5 and 6 in Table 3 show the effect of such a heat treatment on the steel 1 with the composition according to Table 1. This achieves a material state which offers advantages for components which overall still have high strengths, especially yield strengths with good ones Formability, must have.
  • This property profile is suitable for the production of cold-formed parts with a high energy absorption capacity (example 5a). By selecting higher annealing temperatures, high strengths can be achieved with extraordinarily low yield strength ratios or, in the same way, high hardening with good elongation values (Examples 5b, 6a to 6c).
  • Example 7 in Table 3 shows that the strip steel 1 produced according to the invention after cold rolling with a 50% degree of deformation and subsequent annealing likewise achieves high strengths with an even further improved yield strength ratio compared to the only hot-rolled strip steels 1 and 2.

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)
  • Heat Treatment Of Steel (AREA)

Abstract

Procédé permettant de produire un feuillard d'acier hautement résistant d'au moins 900 MPa et présentant une bonne malléabilité. Ledit acier contient (en % en masse) 0,10 à 0,20 % de C, 0,30 à 0,60 % de Si, 1,50 à 2,00 % de Mn, au plus 0,08 % de P, 0,30 à 0,80 % de Cr, jusqu'à 0,40 % de Mo, jusqu'à 0,20 % de Ti et/ou de Zr, et jusqu'à 0,08 % de Nb, le reste étant constitué de fer et des impuretés inévitables. Il est élaboré, coulé en brames et enfin laminé à chaud. La température finale de laminage est supérieure à 800 DEG C, la vitesse de refroidissement sur le train à rouleaux d'évacuation est d'au moins 30 DEG C/s et la température de dévidoir de 300 à 600 DEG C.
EP98916911A 1997-03-13 1998-03-10 Procede permettant de fabriquer un feuillard d'acier a resistance et a malleabilite elevees Expired - Lifetime EP0966547B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19710125 1997-03-13
DE19710125A DE19710125A1 (de) 1997-03-13 1997-03-13 Verfahren zur Herstellung eines Bandstahles mit hoher Festigkeit und guter Umformbarkeit
PCT/EP1998/001376 WO1998040522A1 (fr) 1997-03-13 1998-03-10 Procede permettant de fabriquer un feuillard d'acier a resistance et a malleabilite elevees

Publications (2)

Publication Number Publication Date
EP0966547A1 true EP0966547A1 (fr) 1999-12-29
EP0966547B1 EP0966547B1 (fr) 2001-10-04

Family

ID=7823066

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98916911A Expired - Lifetime EP0966547B1 (fr) 1997-03-13 1998-03-10 Procede permettant de fabriquer un feuillard d'acier a resistance et a malleabilite elevees

Country Status (11)

Country Link
EP (1) EP0966547B1 (fr)
CN (1) CN1082549C (fr)
AR (1) AR010130A1 (fr)
AT (1) ATE206472T1 (fr)
CA (1) CA2284124A1 (fr)
CZ (1) CZ290944B6 (fr)
DE (2) DE19710125A1 (fr)
ES (1) ES2165157T3 (fr)
PL (1) PL186831B1 (fr)
WO (1) WO1998040522A1 (fr)
ZA (1) ZA982115B (fr)

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CA2272943C (fr) 1998-06-17 2008-08-12 Black & Decker Inc. Appareil pour le chargement de piles
EP1041167B1 (fr) * 1998-09-29 2011-06-29 JFE Steel Corporation Feuille mine d'acier haute resistance et feuille d'acier allie haute resistance revetue de zinc et galvanisee a chaud.
DE29818244U1 (de) * 1998-10-13 1998-12-24 Benteler Werke Ag Stahllegierung
DE19937271C2 (de) 1999-08-06 2003-01-09 Hille & Mueller Gmbh & Co Verfahren zur Herstellung von tiefzieh- oder abstreckziehfähigem, veredeltem Kaltband, sowie Kaltband, vorzugsweise zur Herstellung von zylindrischen Behältern und insbesondere Batteriebehältern
WO2001020051A1 (fr) * 1999-09-16 2001-03-22 Nkk Corporation Plaque fine d'acier a resistance elevee et procede de production correspondant
FR2807068B1 (fr) * 2000-03-29 2002-10-11 Usinor Acier lamine a chaud a tres haute limite d'elasticite et resistance mecanique utilisable notamment pour la realisation de piece de vehicules automobiles
JP4085583B2 (ja) 2001-02-27 2008-05-14 Ｊｆｅスチール株式会社 高強度冷延溶融亜鉛メッキ鋼板およびその製造方法
DE10130774C1 (de) * 2001-06-26 2002-12-12 Thyssenkrupp Stahl Ag Verfahren zum Herstellen von hochfesten, aus einem Warmband kaltverformten Stahlprodukten mit guter Dehnbarkeit
EP1288322A1 (fr) * 2001-08-29 2003-03-05 Sidmar N.V. Acier à tres haute résistance mécanique, procédé pour la production de cet acier et le produit obtenu
DE10153234A1 (de) * 2001-10-31 2003-05-22 Thyssenkrupp Stahl Ag Für die Herstellung von nichtkornorientiertem Elektroblech bestimmtes, warmgewalztes Stahlband und Verfahren zu seiner Herstellung
DE10161465C1 (de) * 2001-12-13 2003-02-13 Thyssenkrupp Stahl Ag Verfahren zum Herstellen von Warmband
FR2847270B1 (fr) * 2002-11-19 2004-12-24 Usinor Procede pour fabriquer une tole en acier resistant a l'abrasion et tole obtenue
FR2847271B1 (fr) * 2002-11-19 2004-12-24 Usinor Procede pour fabriquer une tole en acier resistant a l'abrasion et tole obtenue
KR101019791B1 (ko) † 2002-12-24 2011-03-04 신닛뽄세이테쯔 카부시키카이샤 용접 열영향부의 내연화성과 버링성이 우수한 고강도 강판
US9999918B2 (en) 2005-10-20 2018-06-19 Nucor Corporation Thin cast strip product with microalloy additions, and method for making the same
US9149868B2 (en) 2005-10-20 2015-10-06 Nucor Corporation Thin cast strip product with microalloy additions, and method for making the same
US10071416B2 (en) 2005-10-20 2018-09-11 Nucor Corporation High strength thin cast strip product and method for making the same
DE502006003835D1 (de) * 2006-10-30 2009-07-09 Thyssenkrupp Steel Ag Verfahren zum Herstellen von Stahl-Flachprodukten aus einem mit Bor mikrolegierten Mehrphasenstahl
DE502006003833D1 (de) * 2006-10-30 2009-07-09 Thyssenkrupp Steel Ag Verfahren zum Herstellen von Stahl-Flachprodukten aus einem mit Silizium legierten Mehrphasenstahl
PL1918402T3 (pl) * 2006-10-30 2009-10-30 Thyssenkrupp Steel Ag Sposób wytwarzania płaskich produktów stalowych ze stali tworzącej strukturę o fazach złożonych
EP2028282B1 (fr) * 2007-08-15 2012-06-13 ThyssenKrupp Steel Europe AG Acier en phase double, produit plat à partir d'un tel acier en phase double et son procédé de fabrication
ES2367713T3 (es) * 2007-08-15 2011-11-07 Thyssenkrupp Steel Europe Ag Acero de fase dual, producto plano de un acero de fase dual tal y procedimiento para la fabricación de un producto plano.
CN101555574B (zh) * 2008-04-11 2011-06-15 宝山钢铁股份有限公司 一种高回火抗力耐磨钢
US20110277886A1 (en) 2010-02-20 2011-11-17 Nucor Corporation Nitriding of niobium steel and product made thereby
DE102010056264C5 (de) * 2010-12-24 2020-04-09 Voestalpine Stahl Gmbh Verfahren zum Erzeugen gehärteter Bauteile
EP2489748B1 (fr) 2011-02-18 2017-12-13 ThyssenKrupp Steel Europe AG Produit plat en acier laminé à chaud fabriqué à partir d'un acier à phase complexe et son procédé de fabrication
CN102864377B (zh) * 2012-09-10 2015-05-20 山西太钢不锈钢股份有限公司 一种热轧带钢及其制造方法
DE112015005690T8 (de) 2014-12-19 2018-04-19 Nucor Corporation Warmgewalztes martensitisches Leichtbau-Stahlblech und Verfahren zum Herstellen desselben
CN105624570A (zh) * 2016-03-10 2016-06-01 绵阳市联合传动科技有限公司 高强度低碳合金钢制动鼓
CN107653361B (zh) * 2017-10-14 2020-02-18 上海鑫昌众星实业有限公司 一种深加工汽车钢板的制备工艺
DE102018122901A1 (de) 2018-09-18 2020-03-19 Voestalpine Stahl Gmbh Verfahren zur Herstellung ultrahochfester Stahlbleche und Stahlblech hierfür

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Also Published As

Publication number Publication date
PL186831B1 (pl) 2004-03-31
DE19710125A1 (de) 1998-09-17
CA2284124A1 (fr) 1998-09-17
AR010130A1 (es) 2000-05-17
CN1082549C (zh) 2002-04-10
ATE206472T1 (de) 2001-10-15
CZ290944B6 (cs) 2002-11-13
CN1252105A (zh) 2000-05-03
ZA982115B (en) 1998-09-14
ES2165157T3 (es) 2002-03-01
DE59801637D1 (de) 2001-11-08
PL335639A1 (en) 2000-05-08
EP0966547B1 (fr) 2001-10-04
CZ321999A3 (cs) 2000-07-12
WO1998040522A1 (fr) 1998-09-17

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