EP0432434B1 - Verfahren zur Herstellung von Verbindungselementen aus einem vollaustenitischen Cr-Mn-Stahl. - Google Patents

Verfahren zur Herstellung von Verbindungselementen aus einem vollaustenitischen Cr-Mn-Stahl. Download PDF

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Publication number
EP0432434B1
EP0432434B1 EP90120990A EP90120990A EP0432434B1 EP 0432434 B1 EP0432434 B1 EP 0432434B1 EP 90120990 A EP90120990 A EP 90120990A EP 90120990 A EP90120990 A EP 90120990A EP 0432434 B1 EP0432434 B1 EP 0432434B1
Authority
EP
European Patent Office
Prior art keywords
max
steel
diameter
preliminary
product
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
EP90120990A
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German (de)
English (en)
French (fr)
Other versions
EP0432434A1 (de
Inventor
Gerald Stein
Marcus O. Speidel
Peter Uggowitzer
Joachim Menzel
Manfred Wagner
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.)
Vereinigte Schmiedewerke GmbH
Original Assignee
Vereinigte Schmiedewerke GmbH
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Publication date
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Publication of EP0432434A1 publication Critical patent/EP0432434A1/de
Application granted granted Critical
Publication of EP0432434B1 publication Critical patent/EP0432434B1/de
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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
    • C22C38/18—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
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N

Definitions

  • the invention relates to a method for producing connecting elements, in particular bolts, screws, nails or wire ropes with a yield strength of at least 1800 N / mm2.
  • AT-PS 337 235 relates to an austenitic stainless steel consisting of 10 to 30% chromium 15 to 45% manganese 0.85 to 3% nitrogen 0.015 to 1% carbon 0.19 to 2% silicon Balance iron and manufacturing-related impurities.
  • This steel is particularly suitable for highly stressed brackets, in motor-generator construction, for submarine cables and for the manufacture of pump housings. In the fully austenitic state, the steel can reach yield strength values of up to 1600 N / mm2 if it is cold-reduced by up to 50%.
  • the steel has a chromium content of 15 to 27% and a manganese content of 21 to 30% according to a formula specified in the AT-PS. Since the steel is melted at atmospheric pressure, the high levels of chromium and manganese are necessary in order to increase the solubility limit of nitrogen in the steel when nitrogen carriers are added.
  • the austenitic nitrogen-containing steel melted according to the AT-PS is characterized by a low porosity.
  • the material breaks at higher degrees of cold reduction, for example when drawing starting material into thin wire cross sections. Porosity in the micro range was also observed. Apart from these metallurgical difficulties, such a steel is very expensive for large-scale use due to its high chromium and manganese content.
  • the production can include the production of blocks after the electro-slag remelting under increased pressure with the addition of nitrogen carriers or the introduction of nitrogen gas, as well as forging and solution annealing. This is followed by quenching in water and uniaxial cold processing. Stress relief annealing at 350 ° C for 2 hours completes the production process of the starting material for the production of the rings.
  • the object of the invention is to produce high-strength, corrosion-resistant connecting elements.
  • the steels of the type according to the invention should be able to be cold worked almost indefinitely. For this purpose, they should be able to be machined from relatively high initial cross sections to the thinnest dimensions without the risk of breakage.
  • the required yield strength values of greater than 1800 N / mm2 can be achieved with certainty, in particular by the outsourcing of the end product preformed with the highest cross-sectional decreases at temperatures of 300 to 500 ° C for a time of 20 times adapted to the cross section Minutes to 5 hours.
  • This aging treatment results in a rearrangement of the dislocations within the steel formed during the previous cold-forming processes, and without changing the so-called dislocation density, which is ultimately responsible for the high strength of these steels.
  • An independent variant for solving the problem according to the invention consists in the use of powder instead of a cast product as the starting material according to claim 2.
  • the metal powder is shaped by hot isostatic pressing into a billet, which is then forged and / or rolled out to a billet of 5 to 150 mm in diameter is, the preliminary product is then cold-formed with a cross-sectional decrease of at least 60% to an end product with a diameter of 0.5 to 90 mm and then the end product is aged at temperatures of 300 to 500 ° C for a period of 20 minutes to 5 hours.
  • Bolts, screws, nails and wire ropes are preferably produced by the method according to the invention.
  • an electrode of the following composition in mass%) carbon 0.06% silicon 0.41% manganese 19.43% phosphorus 0.012% sulfur 0.008% chrome 18.25% molybdenum 0.81% nickel 0.37% Remainder iron, melted and at the same time adjusted to a nitrogen content of 0.88% by adding nitrogenous materials.
  • the steel block solidified in the pressure electro-slag remelting furnace with the above overall analysis was then brought to a cross-section of 7 mm in diameter by forging and rolling.
  • the diameter was cold drawn from 7 mm to 3 mm in 8 passes. This corresponds to a total deformation of 82% (approx. 10% cold deformation per train).
  • the wire was further cold drawn from a diameter of 3 mm to 1.8 mm.
  • the total deformation was 64% in 6 moves (approx. 10% deformation per move).
  • the wire drawn to 1.8 mm in diameter was then aged at a temperature of 400 ° C. for 4 hours.
  • the corresponding values before the aging treatment were 2100 N / mm2 for the yield strength, 2220 N / mm2 for the tensile strength, 6% for the elongation and 46% for the fracture constriction.
  • the aging treatment according to the invention is of high importance. With this aging treatment it is possible to set yield strengths and tensile strength values that were previously unknown. It is particularly surprising that the values for the toughness, expressed here by the elongation and the fracture constriction, remain constant.
  • the steels remain non-magnetic even at the highest degrees of deformation. It also reduces susceptibility to stress corrosion cracking in dilute aqueous solutions up to 80 ° C.
EP90120990A 1989-12-07 1990-11-02 Verfahren zur Herstellung von Verbindungselementen aus einem vollaustenitischen Cr-Mn-Stahl. Expired - Lifetime EP0432434B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3940438A DE3940438C1 (it) 1989-12-07 1989-12-07
DE3940438 1989-12-07

Publications (2)

Publication Number Publication Date
EP0432434A1 EP0432434A1 (de) 1991-06-19
EP0432434B1 true EP0432434B1 (de) 1994-09-21

Family

ID=6394974

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90120990A Expired - Lifetime EP0432434B1 (de) 1989-12-07 1990-11-02 Verfahren zur Herstellung von Verbindungselementen aus einem vollaustenitischen Cr-Mn-Stahl.

Country Status (4)

Country Link
EP (1) EP0432434B1 (it)
JP (1) JPH0688160A (it)
AT (1) ATE111968T1 (it)
DE (2) DE3940438C1 (it)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19607828C2 (de) * 1995-04-15 2003-06-18 Vsg En Und Schmiedetechnik Gmb Verfahren zum Herstellen eines austenitischen Cv-Mn-Stahls
DE19648335C2 (de) 1996-11-22 2000-05-25 Daimler Chrysler Ag Anordnung zur Positionsmessung
DE19758613C2 (de) * 1997-04-22 2000-12-07 Krupp Vdm Gmbh Hochfeste und korrosionsbeständige Eisen-Mangan-Chrom-Legierung
EP0918099A1 (de) * 1997-10-27 1999-05-26 Stahlwerk Ergste Westig GmbH Chrom-Mangan-Stahllegierung
SE9704753L (sv) * 1997-12-17 1998-11-09 Haldex Garphyttan Ab Sätt att framställa kalldragen tråd av ESR-omsmält rostfritt stål samt kalldragen tråd
CH694401A5 (de) 1999-05-26 2004-12-31 Basf Ag Nickelarmer, molybdänarmer, biokompatibler, nicht Allergie auslösender, korrosionsbeständiger austenitischer Stahl.
EP1194605A1 (de) 1999-06-24 2002-04-10 Basf Aktiengesellschaft Nickelarmer austenitischer stahl
AT407882B (de) * 1999-07-15 2001-07-25 Schoeller Bleckmann Oilfield T Verfahren zur herstellung eines paramagnetischen, korrosionsbeständigen werkstoffes u.dgl. werkstoffe mit hoher dehngrenze, festigkeit und zähigkeit
AT412727B (de) 2003-12-03 2005-06-27 Boehler Edelstahl Korrosionsbeständige, austenitische stahllegierung
AT8763U1 (de) * 2005-12-06 2006-12-15 Teufelberger Seil Ges M B H Lineares zugkraftübertragungselement, insbesondere draht bzw. kombination von drähten
US7658883B2 (en) 2006-12-18 2010-02-09 Schlumberger Technology Corporation Interstitially strengthened high carbon and high nitrogen austenitic alloys, oilfield apparatus comprising same, and methods of making and using same
JP5858424B2 (ja) * 2011-12-01 2016-02-10 株式会社日本製鋼所 固体高分子型燃料電池セパレータ用ステンレス鋼およびその製造方法
CN102719682B (zh) * 2012-02-14 2014-05-21 攀钢集团江油长城特殊钢有限公司 Gh901合金的冶炼方法
CN106893936B (zh) * 2014-06-11 2018-11-30 丹阳市凯鑫合金材料有限公司 真空熔炼的射频器的谐振杆用殷钢冷镦丝的生产方法
JP6640654B2 (ja) * 2016-05-30 2020-02-05 株式会社東芝 高Ｃｒ鋼部品の製造方法
DE102017116615B3 (de) 2017-07-24 2018-08-30 Benteler Steel/Tube Gmbh Kolbenzylindersystem mit mindestens einem Rohrelement
CN111500942B (zh) * 2020-05-11 2021-08-10 湖南恒基粉末科技有限责任公司 一种高氮含量无磁不锈钢粉末及其制备方法
CN112719794B (zh) * 2020-12-16 2022-03-11 浙江福尔加机械股份有限公司 一种汽车轮毂螺栓的加工方法

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2745740A (en) * 1954-09-02 1956-05-15 Ford Motor Co Process of preparing an iron base melt
US2783169A (en) * 1955-02-15 1957-02-26 Ford Motor Co Process of producing nitrogen rich wrought austenitic alloys
AT266900B (de) * 1963-05-24 1968-12-10 Boehler & Co Ag Geb Austenitische unmagnetisierbare Stähle zur Herstellung von bewegten, insbesondere schwingend beanspruchten Maschinenteilen
US3820980A (en) * 1972-05-08 1974-06-28 Allegheny Ludlum Ind Inc Austenitic stainless steel
US3936297A (en) * 1972-05-08 1976-02-03 Allegheny Ludlum Industries, Inc. Method of producing austenitic stainless steel
US3912503A (en) * 1973-05-14 1975-10-14 Armco Steel Corp Galling resistant austenitic stainless steel
IT1039425B (it) * 1974-06-27 1979-12-10 Inteco Int Techn Beratung Procedimento per la produzione di acciai austenitici con elevati contenuti di azoto
DE3143096A1 (de) * 1980-11-05 1982-05-19 General Electric Co., Schenectady, N.Y. "legierung auf eisenbasis, verfahren zu ihrer herstellung und damit hergestellte gegenstaende"
CA1205659A (en) * 1981-03-20 1986-06-10 Masao Yamamoto Corrosion-resistant non-magnetic steel and retaining ring for a generator made of it

Also Published As

Publication number Publication date
ATE111968T1 (de) 1994-10-15
JPH0688160A (ja) 1994-03-29
DE59007249D1 (de) 1994-10-27
DE3940438C1 (it) 1991-05-23
EP0432434A1 (de) 1991-06-19

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