EP0306609A2 - Procédé pour la fabrication d'un produit semi-fini ou produit fini à partir d'un acier martensitique au chrome, fortement allié et en phase unique par déformation à froid et/ou à chaud - Google Patents

Procédé pour la fabrication d'un produit semi-fini ou produit fini à partir d'un acier martensitique au chrome, fortement allié et en phase unique par déformation à froid et/ou à chaud Download PDF

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Publication number
EP0306609A2
EP0306609A2 EP88106438A EP88106438A EP0306609A2 EP 0306609 A2 EP0306609 A2 EP 0306609A2 EP 88106438 A EP88106438 A EP 88106438A EP 88106438 A EP88106438 A EP 88106438A EP 0306609 A2 EP0306609 A2 EP 0306609A2
Authority
EP
European Patent Office
Prior art keywords
steel
ferrite
annealing
hot
cold working
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
EP88106438A
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German (de)
English (en)
Other versions
EP0306609B1 (fr
EP0306609A3 (fr
Inventor
Christo Wassilew
Bernhard Dafferner
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.)
Karlsruher Institut fuer Technologie KIT
Original Assignee
Kernforschungszentrum Karlsruhe GmbH
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 Kernforschungszentrum Karlsruhe GmbH filed Critical Kernforschungszentrum Karlsruhe GmbH
Publication of EP0306609A2 publication Critical patent/EP0306609A2/fr
Publication of EP0306609A3 publication Critical patent/EP0306609A3/fr
Application granted granted Critical
Publication of EP0306609B1 publication Critical patent/EP0306609B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment

Definitions

  • the invention relates to a method for producing a semifinished product or end product from single-phase, high-alloy, martensitic chromium steel by hot and / or cold working.
  • high-alloy martensitic chrome steel is used for certain, highly stressed parts of the system.
  • Such semi-finished products or end products are usually produced by cold and / or hot working, and after cold working of more than about 20%, heat treatment is carried out in a vacuum, inert gas or slightly reducing atmosphere.
  • soft annealing is carried out at temperatures of around 600 to 800 ° C and a typical annealing time of 1 to 2 hours, the temperatures and the annealing time depending on the type of steel.
  • the annealing temperature of the intermediate heat treatment is 700 - 780 ° C.
  • the intermediate annealing treatment breaks down the material hardening that occurs during rolling, drawing, vocational or rotary hammering.
  • the final heat treatment of the semi-finished or end products made of martensitic steels is the heat treatment.
  • This consists of austenitization annealing (hardness annealing), to which an annealing annealing, which leads to an improvement in toughness, is excluded.
  • the austenitization annealing is at temperatures above the A C1 temperature and a typical annealing time of 0.1 - 1 h.
  • the temperature of the austenitizing annealing is 1075 ° C and the annealing time is 0.5 - 1 h.
  • the subsequent annealing is carried out at temperatures below the A C1 temperature with a typical annealing time of 1 - 2 h.
  • the tempering temperature is selected depending on the desired strength and toughness of the semi-finished or end product at temperatures between approximately 580 and 780 ° C.
  • the duration of the tempering heat treatment is 1-2 hours.
  • the duration of the heat treatment should be increased by 1-2 minutes for each additional mm for plates with a wall thickness of more than 10 mm or for bars with a diameter of more than 15 mm.
  • Cooling takes place in air with a minimum cooling rate of 30 K / min for austenitizing annealing and a maximum of 15 K / min for tempering and soft annealing.
  • this ⁇ -ferrite phase is particularly favored by the result of cold working / intermediate annealing.
  • the tendency to ⁇ -ferrite formation increases with the increase in the number of cycles or the degree of cold deformation.
  • the austenitization temperature from which the ⁇ -ferrite formation begins is reduced.
  • the object of the invention is to provide a process for the production of semi-finished products and end products which excludes the formation of ⁇ -ferrite during steel processing or by which the ⁇ -ferrite possibly formed during steel processing is dissolved again, so that any high degree of deformation can be achieved and a single-phase ⁇ -ferrite-free material is available after completion of the shaping and tempering treatment, regardless of the number of consequences of cold forming / heat treatment.
  • This stabilization annealing is advantageously carried out at a temperature above A C1 temperature, but below the austenitizing temperature for the respective steel, preferably at 950 ° C., in a vacuum, inert gas or slightly reducing atmosphere.
  • the additional stabilization annealing according to the invention prior to the intermediate heat treatments or prior to the heat treatment is indispensable if successive cold deformation steps, in particular by pulling, rolling, vocational or round hammers, are aimed at, since otherwise the processability of the material deteriorates increasingly and damage occurs with further deformation occur due to crack formation, which are due to the increased tendency to brittle fracture due to the ⁇ -ferrite component formed. However, such damage can only occur on the claimed finished product.
  • the additional stabilization annealing effectively eliminates the cause of the increased tendency to brittle fracture, the formation of ⁇ -ferrite during processing. Already formed ⁇ -ferrite can be dissolved again by the stabilization annealing. In the case of semi-finished products or end products produced entirely or mainly by hot working, a stabilization annealing carried out before the tempering treatment is sufficient.
  • the additional stabilization annealing makes it possible to obtain a ⁇ -ferrite-free and thus single-phase material; any ⁇ -ferrite components that have formed during the deformation are dissolved by the stabilization annealing.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Steel (AREA)
EP88106438A 1987-09-10 1988-04-22 Procédé pour la fabrication d'un produit semi-fini ou produit fini à partir d'un acier martensitique au chrome, fortement allié et en phase unique par déformation à froid et/ou à chaud Expired - Lifetime EP0306609B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3730379 1987-09-10
DE19873730379 DE3730379A1 (de) 1987-09-10 1987-09-10 Verfahren zur herstellung eines halbzeugs oder endproduktes aus einphasigem, hochlegiertem martensitischem chromstahl durch warm- und/oder kaltverformung

Publications (3)

Publication Number Publication Date
EP0306609A2 true EP0306609A2 (fr) 1989-03-15
EP0306609A3 EP0306609A3 (fr) 1991-04-17
EP0306609B1 EP0306609B1 (fr) 1994-08-24

Family

ID=6335691

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88106438A Expired - Lifetime EP0306609B1 (fr) 1987-09-10 1988-04-22 Procédé pour la fabrication d'un produit semi-fini ou produit fini à partir d'un acier martensitique au chrome, fortement allié et en phase unique par déformation à froid et/ou à chaud

Country Status (2)

Country Link
EP (1) EP0306609B1 (fr)
DE (1) DE3730379A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2659983A1 (fr) * 1990-03-22 1991-09-27 Kernforschungsz Karlsruhe Procede pour la fabrication de pieces usinees a partir d'acier au chrome martensitique a 9-12%, apte au traitement de trempe et revenu.
WO1992014742A1 (fr) 1991-02-14 1992-09-03 Applied Biosystems, Inc. Procede permettant de synthetiser des analogues d'oligonucleotides sulfures
US6758921B1 (en) * 1999-09-02 2004-07-06 Benteler Ag Method of manufacturing a bending-resistant, torsionally yielding tubular profiled member as a transverse support for a twist beam rear axle of a passenger car
AT508101B1 (de) * 2009-04-08 2011-12-15 Comtes Fht As Verarbeitungsweise eines stahlhalbzeuges über die ac1-temperatur
CN104313278A (zh) * 2014-10-23 2015-01-28 北京科技大学 一种马氏体型耐热钢中δ铁素体含量控制方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2070431C (fr) † 1990-10-05 1995-11-14 Hirohisa Morishita Copolymere de polyoxymethylene et procede pour sa production
DE4101220C2 (de) * 1991-01-17 1994-10-06 Kernforschungsz Karlsruhe Verfahren zur Herstellung eines Halbzeugs oder Werkstücks

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4168994A (en) * 1978-11-13 1979-09-25 Combustion Engineering, Inc. Thermal homogenization of steam generating tubing

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2659983A1 (fr) * 1990-03-22 1991-09-27 Kernforschungsz Karlsruhe Procede pour la fabrication de pieces usinees a partir d'acier au chrome martensitique a 9-12%, apte au traitement de trempe et revenu.
WO1992014742A1 (fr) 1991-02-14 1992-09-03 Applied Biosystems, Inc. Procede permettant de synthetiser des analogues d'oligonucleotides sulfures
US6758921B1 (en) * 1999-09-02 2004-07-06 Benteler Ag Method of manufacturing a bending-resistant, torsionally yielding tubular profiled member as a transverse support for a twist beam rear axle of a passenger car
AT508101B1 (de) * 2009-04-08 2011-12-15 Comtes Fht As Verarbeitungsweise eines stahlhalbzeuges über die ac1-temperatur
CN104313278A (zh) * 2014-10-23 2015-01-28 北京科技大学 一种马氏体型耐热钢中δ铁素体含量控制方法

Also Published As

Publication number Publication date
DE3730379C2 (fr) 1991-02-21
EP0306609B1 (fr) 1994-08-24
EP0306609A3 (fr) 1991-04-17
DE3730379A1 (de) 1989-03-30

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