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EP0889144B1 - Applications for a light structural steel - Google Patents

Applications for a light structural steel Download PDF

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Publication number
EP0889144B1
EP0889144B1 EP98109813A EP98109813A EP0889144B1 EP 0889144 B1 EP0889144 B1 EP 0889144B1 EP 98109813 A EP98109813 A EP 98109813A EP 98109813 A EP98109813 A EP 98109813A EP 0889144 B1 EP0889144 B1 EP 0889144B1
Authority
EP
European Patent Office
Prior art keywords
steel
light structural
mass
percent
structural 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.)
Expired - Lifetime
Application number
EP98109813A
Other languages
German (de)
French (fr)
Other versions
EP0889144B8 (en
EP0889144A1 (en
Inventor
Georg Prof. Dr.-Ing. Frommeyer
Oliver Dipl.-Ing. Grässel
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 EP0889144A1 publication Critical patent/EP0889144A1/en
Application granted granted Critical
Publication of EP0889144B1 publication Critical patent/EP0889144B1/en
Publication of EP0889144B8 publication Critical patent/EP0889144B8/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C22C38/04—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
    • C22C38/02—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

Definitions

  • the invention relates to the use of a lightweight steel.
  • the invention has for its object a good cold-formable, especially deep-drawable, Lightweight steel with a tensile strength up to 1100 MPa and with TRIP and TWIP properties, the one with alloyed inexpensive elements and therefore inexpensive is producible and for the production of highly stressed sheet metal parts is usable.
  • This object is achieved according to the invention through the use of a cold-formable, in particular deep-drawable, austenitic lightweight steel, which has a tensile strength up to 1100 MPa and TRIPund TWIP properties, with (in mass%) 1 to 6% Si, 1 to 8% Al, wherein (Al + Si) ⁇ 12%, 10 to 30% Mn, balance essentially iron including conventional ones Steel accompanying elements as material for body sheet metal parts and stiffening Body elements made of sheet metal.
  • the steel mentioned can also be used as a material for hot and / or cold-rolled sheets for containers used in the low temperature range and / or Pipelines are used.
  • the lightweight steel used according to the invention preferably contains 2 to 4% Si and Al and 24 to 26% Mn, balance essentially iron.
  • the steels used are characterized by higher yield stresses from 400 MPa due to the high solidification rate Have tensile strength values up to 1100 MPa and Uniform stretch values up to 70% and maximum strains achieve up to 90%.
  • the high values of energy absorption - dissipative energy - of 0.5 J.mm -3 are based on the deformation-induced martensitic phase transformation and the intensive formation of twins in the austenite phase. These and the mechanical properties are retained even at extremely high forming speeds of up to 10 3 s -1 .
  • the excellent plasticity of the TRIP and TWIP steels used according to the invention is retained down to low temperatures.
  • the steel used according to the invention achieves a density which is reduced to 7 g / cm 3 due to the alloying elements Al, Si and Mn.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Body Structure For Vehicles (AREA)

Abstract

The invention relates to a high-quality, cold-formable, ultra-resistant austenitic light constructional steel having particularly good deep-draw qualities, with a tensile strength of up to 1,100 MPa in addition to TRIP and TWIP qualities. The invention also relates to the use of said steel in body work components reinforcing structural components, cryogen containers and piping.

Description

Die Erfindung betrifft die Verwendung eines Leichtbaustahls.The invention relates to the use of a lightweight steel.

Der Erfindung liegt die Aufgabe zugrunde, einen gut kaltumformbaren, insbesondere gut tiefziehfähigen, Leichtbaustahl mit einer Zugfestigkeit bis 1100 MPa und mit TRIP- und TWIP-Eigenschaften zu finden, der mit preiswerten Elementen legiert und daher kostengünstig herstellbar ist und zur Herstellung von hochbeanspruchten Blechteilen verwendbar ist.The invention has for its object a good cold-formable, especially deep-drawable, Lightweight steel with a tensile strength up to 1100 MPa and with TRIP and TWIP properties, the one with alloyed inexpensive elements and therefore inexpensive is producible and for the production of highly stressed sheet metal parts is usable.

Diese Aufgabe wird erfindungsgemäß gelöst durch die Verwendung eines kaltumformbaren, insbesondere tiefziehfähigen, austenitischen Leichtbaustahls, welcher eine Zugfestigkeit bis 1100 MPa sowie TRIPund TWIP-Eigenschaften aufweist, mit (in Masse-%) 1 bis 6 % Si, 1 bis 8 % Al, wobei (Al + Si) ≤ 12 %, 10 bis 30 % Mn, Rest im wesentlichen Eisen einschließlich üblicher Stahlbegleitelemente als Werkstoff für Karosserieblechteile und versteifende Karosserieelemente aus Blech.This object is achieved according to the invention through the use of a cold-formable, in particular deep-drawable, austenitic lightweight steel, which has a tensile strength up to 1100 MPa and TRIPund TWIP properties, with (in mass%) 1 to 6% Si, 1 to 8% Al, wherein (Al + Si) ≤ 12%, 10 to 30% Mn, balance essentially iron including conventional ones Steel accompanying elements as material for body sheet metal parts and stiffening Body elements made of sheet metal.

Erfindungsgemäß kann der erwähnte Stahl auch als Werkstoff für warm- und / oder kaltgewalzte Bleche für im Bereich der Tieftemperatur eingesetzte Behälter und / oder Rohrleitungen verwendet werden.According to the invention, the steel mentioned can also be used as a material for hot and / or cold-rolled sheets for containers used in the low temperature range and / or Pipelines are used.

Metal Progress, März 1983, Seite 72 - 76, beschreibt die Verwendung eines austenitischen Stahls mit Gehalten von 1 - 1,5 % Si, 5 - 12 % Al und 20 - 30 % Mn für gegossene Schiffsschrauben, welcher Stahl in Meerwasser korrosionsbeständig ist und Messing ersetzen soll.Metal Progress, March 1983, pages 72-76, describes the use of a austenitic steel with contents of 1 - 1.5% Si, 5 - 12% Al and 20 - 30% Mn for cast ship propellers, which steel is corrosion-resistant in sea water and To replace brass.

Bevorzugt enthält der erfindungsgemäß verwendete Leichtbaustahl je 2 bis 4 % Si und Al sowie 24 bis 26 % Mn, Rest im wesentlichen Eisen.The lightweight steel used according to the invention preferably contains 2 to 4% Si and Al and 24 to 26% Mn, balance essentially iron.

Die verwendeten Stähle zeichnen sich durch höhere Fließspannungen von 400 MPa aus, die infolge der hohen Verfestigungsrate Zugfestigkeitswerte bis 1100 MPa aufweisen und Gleichmaßdehnungswerte bis 70 % sowie maximale Dehnungen bis 90 % erzielen. The steels used are characterized by higher yield stresses from 400 MPa due to the high solidification rate Have tensile strength values up to 1100 MPa and Uniform stretch values up to 70% and maximum strains achieve up to 90%.

Ein erfindungsgemäß verwendeter Stahl innerhalb des Legierungsbereichs mit jeweils 3 % Si und Al und 25 % Mn, Rest Fe, der austenitisches Gefüge und TRIP-(Transformation Induced Plasticity) und TWIP-(Twinning Induced Plasticity) Eigenschaften hat, erreichte bei Temperaturen unter - 150 °C Dehnungswerte bis 65 % bei nahezu konstant gebliebener Energieverzehrrate von 0,5 J.mm-3 gegenüber 0,2 J.mm-3 bekannter höherfester Tiefziehgüten. Die hohen Werte der Energieabsorption - dissipative Energie - von 0,5 J.mm-3 beruhen auf der verformungsinduzierten martensitischen Phasentransformation und der intensiven Zwillingsbildung in der Austenitphase. Diese und die mechanischen Eigenschaften bleiben auch bei extrem hohen Umformgeschwindigkeiten bis 103 s-1 erhalten. Die ausgezeichnete Plastizität der erfindungsgemäß verwendeten TRIP-und TWIP-Stähle bleibt bis zu tiefen Temperaturen erhalten.A steel used according to the invention within the alloy range with 3% Si and Al and 25% Mn, rest Fe, which has an austenitic structure and TRIP (Transformation Induced Plasticity) and TWIP (Twinning Induced Plasticity) properties, reached at temperatures below - 150 ° C elongation values up to 65% with an almost constant energy consumption rate of 0.5 J.mm -3 compared to 0.2 J.mm -3 of known higher strength thermoforming grades. The high values of energy absorption - dissipative energy - of 0.5 J.mm -3 are based on the deformation-induced martensitic phase transformation and the intensive formation of twins in the austenite phase. These and the mechanical properties are retained even at extremely high forming speeds of up to 10 3 s -1 . The excellent plasticity of the TRIP and TWIP steels used according to the invention is retained down to low temperatures.

Darüberhinaus erreicht der erfindungsgemäß verwendete Stahl aufgrund der Legierungselemente Al, Si und Mn eine bis auf 7 g/cm3 abgesenkte Dichte.In addition, the steel used according to the invention achieves a density which is reduced to 7 g / cm 3 due to the alloying elements Al, Si and Mn.

Aufgrund des geschilderten Eigenschaftsspektrums eignen sich warm- und gegebenenfalls kaltgewalzte Bleche aus dem erfindungsgemäß verwendeten Stahl mit Vorteil für crashstabile Karosseriestrukturen von Kraftfahrzeugen, aber auch für die Cryogentechnik als Behälter- und Rohrleitungswerkstoff.Suitable due to the range of properties described warm and if necessary cold-rolled sheets made of the steel used according to the invention, with advantage for crash-stable Body structures of motor vehicles, but also for cryogenic technology as container and Piping material.

Claims (4)

  1. Usage of an austenitic light structural steel which can be cold formed, and particularly has good deep drawing properties, having a tensile strength of up to 1100 MPa and TRIP and TWIP properties, with (in mass-percent) 1 to 6 % Si, 1 to 8 % Al, with (Al + Si) ≤ 12 %, 10 to 30 % Mn, with the remainder essentially being iron, including typical steel companion elements, as a material for automobile body sheet steel parts and automobile body stiffening elements made of sheet steel.
  2. Usage of an austenitic light structural steel which can be cold formed, and particularly has good deep drawing properties, having a tensile strength of up to 1100 MPa and TRIP and TWIP properties, with (in mass-percent) 1 to 6 % Si, 1 to 8 % Al, with (Al + Si) ≤ 12 %, 10 to 30 % Mn, with the remainder essentially being iron, including typical steel companion elements, as a material for hot and/or cold rolled steel sheets for containers and/or pipelines used within the range of low temperatures.
  3. Usage according to one of the claims 1 or 2, characterized in that the light structural steel contains (in mass-percent) 2.0 to 4.0 % Si, 2.0 to 4.0 % Al, 24 to 26 % Mn, with the remainder essentially being iron, including typical steel companion elements.
  4. Usage according to one of the claims 1 or 2, characterized in that the light structural steel contains (in mass-percent) 3 % each Al and Si, and 25 % Mn, with the remainder essentially being iron, including typical steel companion elements.
EP98109813A 1997-07-01 1998-05-29 Applications for a light structural steel Expired - Lifetime EP0889144B8 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19727759 1997-07-01
DE19727759A DE19727759C2 (en) 1997-07-01 1997-07-01 Use of a lightweight steel

Publications (3)

Publication Number Publication Date
EP0889144A1 EP0889144A1 (en) 1999-01-07
EP0889144B1 true EP0889144B1 (en) 2002-07-17
EP0889144B8 EP0889144B8 (en) 2009-11-18

Family

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Family Applications (1)

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EP98109813A Expired - Lifetime EP0889144B8 (en) 1997-07-01 1998-05-29 Applications for a light structural steel

Country Status (7)

Country Link
US (1) US6387192B1 (en)
EP (1) EP0889144B8 (en)
JP (1) JP2002507251A (en)
AT (1) ATE220731T1 (en)
DE (1) DE19727759C2 (en)
ES (1) ES2179400T3 (en)
WO (1) WO1999001585A1 (en)

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US9677146B2 (en) 2008-11-12 2017-06-13 Voestalpine Stahl Gmbh Manganese steel strip having an increased phosphorous content and process for producing the same
US10273556B2 (en) 2013-12-24 2019-04-30 Posco Lightweight steel sheet having excellent strength and ductility and method for manufacturing same

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US9677146B2 (en) 2008-11-12 2017-06-13 Voestalpine Stahl Gmbh Manganese steel strip having an increased phosphorous content and process for producing the same
US9206698B2 (en) 2012-04-11 2015-12-08 Straaltechniek International N.V/S.A. Turbine
US10273556B2 (en) 2013-12-24 2019-04-30 Posco Lightweight steel sheet having excellent strength and ductility and method for manufacturing same

Also Published As

Publication number Publication date
WO1999001585A1 (en) 1999-01-14
US6387192B1 (en) 2002-05-14
JP2002507251A (en) 2002-03-05
DE19727759C2 (en) 2000-05-18
EP0889144B8 (en) 2009-11-18
ES2179400T3 (en) 2003-01-16
ATE220731T1 (en) 2002-08-15
DE19727759A1 (en) 1999-01-07
EP0889144A1 (en) 1999-01-07

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