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EP1040206B1 - Method for producing rust-resistant ferritic or ferritic-martensitic constructional steel - Google Patents

Method for producing rust-resistant ferritic or ferritic-martensitic constructional steel Download PDF

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Publication number
EP1040206B1
EP1040206B1 EP98966508A EP98966508A EP1040206B1 EP 1040206 B1 EP1040206 B1 EP 1040206B1 EP 98966508 A EP98966508 A EP 98966508A EP 98966508 A EP98966508 A EP 98966508A EP 1040206 B1 EP1040206 B1 EP 1040206B1
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EP
European Patent Office
Prior art keywords
steels
martensitic
resistant
rust
ferritic
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
EP98966508A
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German (de)
French (fr)
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EP1040206A1 (en
Inventor
Klaus Peter Erkel
Martin Erkel
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.)
VON MOOS STAHL AG
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Von Moos Stahl AG
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Filing date
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Publication of EP1040206A1 publication Critical patent/EP1040206A1/en
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Anticipated expiration legal-status Critical
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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 by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • 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
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/08—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires for concrete reinforcement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
    • B21B3/02—Rolling special iron alloys, e.g. stainless steel
    • 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
    • C21D2211/008—Martensite

Definitions

  • the invention relates to the production of stainless structural steels in one wide range of applications for sheets, strips, tubes, rods, etc. can be used.
  • On preferred application is the production of smooth or ribbed and also weldable reinforcing steels, i.e. of stainless reinforcement steel for the Reinforced concrete construction.
  • Such stainless structural steels belong to the martensitic or ferritic martensitic Class and they get theirs through thermomechanical treatment intended properties.
  • ferritic, austenitic-ferritic and austenitic reinforcing steels according to DIN EN 10088 in the heat-treated state have lower yield strengths than the 500 N / mm 2 required for BSt 500 according to DIN 488 T1
  • these steels were subjected to cold deformation and as cold-ribbed reinforcement steels with strength properties according to DIN 488 T1 developed, especially stainless steel bond: stainless reinforcing steel for reinforced concrete construction and for anchoring, material sheet from Krupp Sigma Stahl AG, Duisburg.
  • EP-A-0 774 520 describes a method for producing steel pipes with excellent Corrosion resistance and weldability described.
  • the heat treatment is here a necessary step after hot rolling with air cooling. There will be none explicit requirements for strength and toughness properties.
  • the intended properties of stainless reinforcing steels such as strength and toughness properties, weldability and corrosion resistance once through thermomechanical treatment from the Rolling heat, i.e. in the rolling process, and not by annealing and subsequent cold forming achieved
  • the intended properties according to DIN 488 T1 can Hot rolling with subsequent tempering can be achieved.
  • the cooling of the stainless reinforcing steel takes place after rolling from the Temperature range ⁇ (austenite) or ⁇ + ⁇ (austenite + ferrite) in air, moving air or in Cooling pipes in water. This creates a fine-grained soft martensitic or ferritic-martensitic Structure of high strength and toughness, so that the requirements of previous Regulations for reinforcing steel are met or exceeded.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The invention relates to a method for producing rust-resistant constructional steels which can be used for sheets, strips, pipes, bars etc., in a wide range of areas of application. One preferred use for the inventive steels is the production of smooth or ribbed, weldable concrete steels, i.e. rust-resistant reinforcement steels for reinforced concrete construction. The aim of the invention is to produce rust-resistant, weldable constructional steels which can be classified as martensitic or ferritic-martensitic, which can be manufactured without annealing and cold-forming according a simplified method, and which have at least equivalent material characteristics. According to the invention, the desired characteristics of the rust-resistant constructional steels, such as resistance and strength characteristics, weldability and resistance to corrosion are obtained by means of thermomechanical treatment using the rolling heat instead of annealing and subsequent cold-forming. On cooling, the rust-resistant martensitic or ferritic-martensitic constructional steels were found to have obtained the same or better properties directly from the rolling heat as if they had been heat-treated and then cold-formed. The invention therefore provides a method for producing rust-resistant constructional or concrete steel without annealing and cold-forming, and therefore more cheaply.

Description

Die Erfindung bezieht sich auf die Herstellung von nichtrostenden Baustählen, die in einem breiten Anwendungsbereich für Bleche, Bänder, Rohre, Stäbe usw. einsetzbar sind. Ein bevorzugtes Einsatzgebiet ist die Herstellung von glatten oder gerippten und dabei auch schweißbaren Betonstählen, d.h. von nichtrostenden Bewehrungsstählen für den Stahlbetonbau. Derartige nichtrostende Baustähle gehören der martensitischen oder ferritischmartensitischen Klasse an und sie erhalten durch thermomechanische Behandlung ihre bestimmungsgemäßen Eigenschaften.The invention relates to the production of stainless structural steels in one wide range of applications for sheets, strips, tubes, rods, etc. can be used. On preferred application is the production of smooth or ribbed and also weldable reinforcing steels, i.e. of stainless reinforcement steel for the Reinforced concrete construction. Such stainless structural steels belong to the martensitic or ferritic martensitic Class and they get theirs through thermomechanical treatment intended properties.

Es ist aus DIN 488 bekannt, daß Betonstähle, wie BSt 500 S und Bst 500 M nach DIN 488, T1 neben anderen Gebrauchseigenschaften zur Bewehrung ausreichend hohe Festigkeits- und Zähigkeitseigenschaften, wie

  • Streckgrenze Re ≥500 N/mm2
  • Zugfestigkeit Rm ≥ 550 N/mm2
  • Bruchdehnung A10 ≥ 10 % aufweisen müssen.
    • It is known from DIN 488 that reinforcing steels, such as BSt 500 S and Bst 500 M according to DIN 488, T1, in addition to other usage properties for reinforcement, have sufficiently high strength and toughness properties, such as
  • Yield strength Re ≥500 N / mm 2
  • Tensile strength Rm ≥ 550 N / mm 2
  • Elongation at break A 10 must be ≥ 10%.

    • Weiter ist bekannt, daß in den letzten Jahren verstärkt nichtrostende Stähle als Betonstähle erprobt und eingesetzt wurden, da sie je nach Legierungsgehalt bzw. Wirksumme gegen Korrosion, die bei normalem Betonstahl zu den gefürchteten Betonabplatzungen führt, beständig sind (U. Nürnberger: Korrosion und Korrosionsschutz im Bauwesen, Bauverlag GmbH Wiesbaden und Berlin 1995, S. 1013 ff, Nichtrostende Stähle im Betonbau und U. Nürnberger / W. Beul / G. Onuseit: Korrosionsverhalten geschweißter nichtrostender Bewehrungsstähle in Beton. In: Bauingenieur 70 (1995) S. 73-81, Springer-Verlag).It is also known that in recent years stainless steels have increasingly been used as reinforcing steels have been tested and used since, depending on the alloy content or effective amount, Corrosion, which leads to the feared spalling of concrete in normal reinforcing steel, are stable (U. Nürnberger: Corrosion and corrosion protection in construction, Bauverlag GmbH Wiesbaden and Berlin 1995, p. 1013 ff, stainless steels in concrete construction and U. Nürnberger / W. Beul / G. Onuseit: Corrosion behavior of welded stainless Reinforcing steel in concrete. In: Bauingenieur 70 (1995) pp. 73-81, Springer-Verlag).

    Da die ferritischen, austenitisch-ferritischen und austenitischen Betonstähle nach DIN EN 10088 im wärmebehandelten Zustand geringere Streckgrenzen als die nach DIN 488 T1 für BSt 500 geforderten 500 N/mm2 aufweisen, wurden diese Stähle einer Kaltverformung unterworfen und als kaltgerippte Bewehrungsstähle mit Festigkeitseigenschaften nach DIN 488 T1 entwickelt, vgL auch Nirosta Bond: Nichtrostende Bewehrungsstähle für den Stahlbetonbau und für Verankerungen, Werkstoffblatt der Krupp Sigma Stahl AG, Duisburg. Since the ferritic, austenitic-ferritic and austenitic reinforcing steels according to DIN EN 10088 in the heat-treated state have lower yield strengths than the 500 N / mm 2 required for BSt 500 according to DIN 488 T1, these steels were subjected to cold deformation and as cold-ribbed reinforcement steels with strength properties according to DIN 488 T1 developed, especially stainless steel bond: stainless reinforcing steel for reinforced concrete construction and for anchoring, material sheet from Krupp Sigma Stahl AG, Duisburg.

    Aus US-A-4,594,115 ist ein Verfahren zur Herstellung nichtrostender martensitischer Stabstähle und Drähte bekannt. Durch das Verfahren, das durch die Schritte Warmwalzen mit Luftabkühlung ohne Anlassen geprägt wird, werden Stähle mit für Betonstahl zu hohen Festigkeiten von Rm = 900 - 1100 hergestellt.From US-A-4,594,115 is a process for the production of stainless martensitic Bar steels and wires known. Through the process of hot rolling with the steps Air cooling is characterized without tempering, steels are too high for reinforcing steel Strengths of Rm = 900 - 1100 produced.

    In EP-A-0 774 520 wird ein Verfahren zur Herstellung von Stahlrohren mit hervorragender Korrosionsbeständigkeit und Schweißbarkeit beschrieben. Die Wärmebehandlung ist hier nach dem Warmwalzen mit Luftabkühlung ein notwendiger Schritt. Es werden keine expliciten Anforderungen an Festigkeits- und Zähigkeitseigenschaften gestellt.EP-A-0 774 520 describes a method for producing steel pipes with excellent Corrosion resistance and weldability described. The heat treatment is here a necessary step after hot rolling with air cooling. There will be none explicit requirements for strength and toughness properties.

    Abgeleitet aus dem vorliegenden Stand der Technik ist es Aufgabe der Erfindung, die Herstellung nichtrostender, schweißbarer Betonstähle zu ermöglichen, die einmal der martensitischen bzw. ferritisch-martensitischen Klasse angehören, nach einem vereinfachten Verfahren ohne Glühen und Kaltumformung gefertigt werden können und zum anderen mindestens gleichwertige Materialeigenschaften aufweisen.Derived from the present prior art, it is an object of the invention To enable the manufacture of stainless, weldable reinforcing steels, which is once the belong to the martensitic or ferritic-martensitic class, according to a simplified Process can be manufactured without annealing and cold forming and secondly have at least equivalent material properties.

    Eine erfindungsgemäße Lösung dieser Aufgabe ist im Patentanspruch 1 angegeben. Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet.An inventive solution to this problem is specified in claim 1. Developments of the invention are characterized in the subclaims.

    Nach der Konzeption der Erfindung werden die bestimmungsgemäßen Eigenschaften der nichtrostenden Betonstähle, wie Festigkeits- und Zähigkertseigenschaften, Schweißbarkeit und Korrosionsbeständigkeit einmal durch thermomechanische Behandlung aus der Walzhitze, d.h. im Walzprozeß, und nicht durch Glühen und anschließende Kaltumformung erzieltAccording to the concept of the invention, the intended properties of stainless reinforcing steels, such as strength and toughness properties, weldability and corrosion resistance once through thermomechanical treatment from the Rolling heat, i.e. in the rolling process, and not by annealing and subsequent cold forming achieved

    Zum anderen können die bestimmungsgemäßen Eigenschaften nach DIN 488 T1 durch Warmwalzen mit anschließenden Anlassen erzielt werden.On the other hand, the intended properties according to DIN 488 T1 can Hot rolling with subsequent tempering can be achieved.

    Es wurde gefunden, daß bei der Abkühlung der nichtrostenden martensitischen bzw. ferritisch-martensitischen Stähle direkt aus der Walzhitze oder durch Warmwalzen mit anschließendem Anlassen Eigenschaften entstehen, die gleich gut oder besser sind als jene nach Wärmebehandlung und anschließender Kaltumformung.It was found that when the rusting martensitic or ferritic-martensitic steels directly from the rolling heat or by hot rolling Subsequent tempering produces properties that are as good as or better than those after heat treatment and subsequent cold forming.

    Mit dem erfindungsgemäßen Verfahren wird erreicht, daß das Glühen und die Kaltumformung entfallen können und nichtrostender Betonstahl kostengünstiger produziert werden kann.With the method according to the invention it is achieved that the annealing and the cold forming can be omitted and stainless reinforcing steel can be produced more cost-effectively.

    Die Abkühlung des nichtrostenden Betonstahles erfolgt nach dem Walzen aus dem Temperaturgebiet γ (Austenit) oder γ + α (Austenit + Ferrit) an Luft, bewegter Luft oder in Kühlrohren in Wasser. Dadurch entsteht ein feinkörniges weichmartensitisches oder ferritischmartensitisches Gefüge hoher Festigkeit und Zähigkeit, sodaß die Anforderungen bisheriger Vorschriften für Betonstahl erfüllt oder übertroffen werden.The cooling of the stainless reinforcing steel takes place after rolling from the Temperature range γ (austenite) or γ + α (austenite + ferrite) in air, moving air or in Cooling pipes in water. This creates a fine-grained soft martensitic or ferritic-martensitic Structure of high strength and toughness, so that the requirements of previous Regulations for reinforcing steel are met or exceeded.

    Eine bevorzugte Zusammensetzung des erfindungsgemäß hergestellten Betonstahls ist bei Anwendung des Werkstoffes 1.4003 nach DIN EN 10088 gegeben.A preferred composition of the reinforcing steel produced according to the invention is at Application of material 1.4003 according to DIN EN 10088 given.

    Weiter ist bei entsprechender Steuerung der Walz- und Kühlparameter ein höherfester nichtrostender Betonstahl mit Re ≥ 600 N/mm2 (= Bst 600), einer Zugfestigkeit Rm ≥ 750 N/mm2 und einer Bruchdehnung A10 ≥ 10 % herstellbar.Furthermore, with appropriate control of the rolling and cooling parameters, a higher-strength stainless reinforcing steel with Re ≥ 600 N / mm 2 (= Bst 600), a tensile strength Rm ≥ 750 N / mm 2 and an elongation at break A 10 ≥ 10% can be produced.

    Bei Anwendung höherer Nickelgehalte bei ferritisch-martensitischen bzw. martensitischen Chromstählen und entsprechender Steuerung der Walz- und Kühlparameter ist sogar ein hochfester nichtrostender Betonstahl mit Re ≥ 700N/mm2 (= BSt 700), einer Zugfestigkeit Rm ≥ 900N/mm2 und einer Bruchdehnung A10 ≥ 8% herstellbar.If higher nickel contents are used for ferritic-martensitic or martensitic chrome steels and appropriate control of the rolling and cooling parameters, even a high-strength stainless reinforcing steel with Re ≥ 700N / mm 2 (= BSt 700), a tensile strength Rm ≥ 900N / mm 2 and an elongation at break A 10 ≥ 8% can be produced.

    Die beschriebenen Stähle mit "normaler" Festigkeit sowie die höherfesten und hochfesten Betonstähle sind insbesondere auch für die Bewehrung von Porenbeton bzw. Leichtbeton verwendbar.The described steels with "normal" strength as well as the higher strength and high strength Reinforcing steels are also particularly suitable for the reinforcement of aerated concrete or lightweight concrete usable.

    Die erfindungsgemäß hergestellten nichtrostenden Betonstähle weisen die gleiche Schweißbarkeit und Korrosionsbeständigkeit auf wie ein geglühter und kaltumgeformter Betonstahl gleicher chemischer Zusammensetzung.The stainless reinforcing steels produced according to the invention have the same Weldability and corrosion resistance like on an annealed and cold formed Reinforcing steel of the same chemical composition.

    Weitere Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus den nachfolgenden Angaben in den Patentansprüchen.Further details, features and advantages of the invention result from the following information in the claims.

    Claims (6)

    1. Procedure for the production of a rust-resistant ferritic or ferritic-martensitic constructional steel according to DIN 488 T1 having the following composition, in wt%: Cr 10.5-14.0 Ni 0.01-4,0 Mn 0.01-3.0 Mo 0.01-2.0 Cu 0.01-2.0 C ≤0.03 N ≤0.03, preferably sum of C + N ≤0.03 Ti ≤0.2
      Si, P, S within the usual impurity limits
      balance Fe and, perhaps, other impurities
      characterized in that the steel is cooled from the final rolling temperature in the temperature region γ or γ + α so that, partly at least, martensite develops.
    2. Procedure to Claim 1
      characterized in that the cooled steel is tempered in the temperature range of 650-720°C.
    3. Procedure to Claim 1 or 2
      characterized in that the steel has the following properties of a higher-strength constructional steel:
      yield point Re ≥600N/mm2
      tensile strength Rm ≥750N/mm2
      breaking elongation A10 ≥10%.
    4. Procedure to Claim 1 or 2
      characterized in that the steel has the following properties of a high-strength constructional steel:
      yield point Re ≥700N/mm2
      tensile strength Rm ≥850N/mm2
      breaking elongation A10 ≥8%.
    5. Procedure to Claims 1 and 3
      characterized in that tempering is carried out in the temperature range of 600-660°C.
    6. Procedure to Claims 1 and 4
      characterized in that tempering is carried out in the temperature range of 550-600°C.
    EP98966508A 1997-12-12 1998-12-07 Method for producing rust-resistant ferritic or ferritic-martensitic constructional steel Expired - Lifetime EP1040206B1 (en)

    Applications Claiming Priority (3)

    Application Number Priority Date Filing Date Title
    DE19755409A DE19755409A1 (en) 1997-12-12 1997-12-12 Stainless structural steel and process for its manufacture
    DE19755409 1997-12-12
    PCT/DE1998/003583 WO1999031283A1 (en) 1997-12-12 1998-12-07 Rust-resistant constructional steel and method for producing the same

    Publications (2)

    Publication Number Publication Date
    EP1040206A1 EP1040206A1 (en) 2000-10-04
    EP1040206B1 true EP1040206B1 (en) 2002-03-06

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    Application Number Title Priority Date Filing Date
    EP98966508A Expired - Lifetime EP1040206B1 (en) 1997-12-12 1998-12-07 Method for producing rust-resistant ferritic or ferritic-martensitic constructional steel

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    EP (1) EP1040206B1 (en)
    CN (1) CN1281514A (en)
    AT (1) ATE214107T1 (en)
    BR (1) BR9813553A (en)
    DE (2) DE19755409A1 (en)
    DK (1) DK1040206T3 (en)
    ES (1) ES2172262T3 (en)
    WO (1) WO1999031283A1 (en)

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    DE102006060994B4 (en) * 2006-12-20 2010-02-11 Zf Friedrichshafen Ag Stainless steel ball studs and sleeves
    CN102505805A (en) * 2011-11-22 2012-06-20 江苏国建新材料股份有限公司 Mixed reinforcement high-strength reinforced concrete component
    CN107686948B (en) * 2017-03-30 2018-09-25 山西同航特钢有限公司 A kind of soft martensitic stain less steel clack box forge piece manufacturing process
    EP3640430B8 (en) 2018-10-16 2021-10-13 Steeltec AG Threaded bar for embedding in cement-based binders, anchor unit formed therefrom and method for producing the threaded bar
    CN116875907A (en) * 2023-06-29 2023-10-13 鞍钢股份有限公司 Ultra-wide duplex stainless steel medium plate and manufacturing method thereof

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    Publication number Publication date
    ATE214107T1 (en) 2002-03-15
    EP1040206A1 (en) 2000-10-04
    DE59803308D1 (en) 2002-04-11
    DK1040206T3 (en) 2002-06-17
    BR9813553A (en) 2000-10-03
    DE19755409A1 (en) 1999-06-17
    WO1999031283A1 (en) 1999-06-24
    ES2172262T3 (en) 2002-09-16
    CN1281514A (en) 2001-01-24

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