EP0573335B1 - Composition d'acier inoxydable pour pièces utilisées en ultravide et à basse température - Google Patents

Composition d'acier inoxydable pour pièces utilisées en ultravide et à basse température Download PDF

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Publication number
EP0573335B1
EP0573335B1 EP93401364A EP93401364A EP0573335B1 EP 0573335 B1 EP0573335 B1 EP 0573335B1 EP 93401364 A EP93401364 A EP 93401364A EP 93401364 A EP93401364 A EP 93401364A EP 0573335 B1 EP0573335 B1 EP 0573335B1
Authority
EP
European Patent Office
Prior art keywords
weight
stainless steel
low temperature
steel composition
high vacuum
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
EP93401364A
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German (de)
English (en)
French (fr)
Other versions
EP0573335A1 (fr
Inventor
Jean C/O Aubert & Duval Bourrat
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.)
Aubert and Duval SA
Original Assignee
Aubert and Duval SA
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Filing date
Publication date
Application filed by Aubert and Duval SA filed Critical Aubert and Duval SA
Publication of EP0573335A1 publication Critical patent/EP0573335A1/fr
Application granted granted Critical
Publication of EP0573335B1 publication Critical patent/EP0573335B1/fr
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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

Definitions

  • the invention relates to a stainless steel composition for parts used in ultrahigh vacuum and at low temperature, in particular having improved mechanical properties, tightness and non-magnetism.
  • stainless steel must be able to withstand, without altering the preceding properties, the degassing treatment at 950 ° C. which certain users must subject it to in a few applications.
  • a stainless steel having a composition comprised within the following limits is used % in weight Carbon up to 0.08 Chromium 19 - 22 Nickel 8 - 11 Manganese 2.50 - 4.25 Molybdenum 2.00 - 3.00 Silicon up to 0.75 Phosphorus up to 0.025 Sulfur up to 0.01 Niobium 0.25 - 0.80 Nitrogen 0.35 - 0.50 Iron Complement
  • nobium serves to stabilize the carbon and consequently reinforces the resistance to corrosion. This addition improves the heat resistance of the shade and indirectly strengthens the elastic limit at low temperature by refining the grain.
  • the steels according to the present invention are obtained in a conventional manner by elaboration in an arc furnace and then undergoes refining by the AOD process (also called “refining in an AOD reactor") ("argon oxygen decarburization", decarburization with argon-oxygen. ) which allows the desired low carbon content to be obtained without difficulty.
  • AOD process also called “refining in an AOD reactor”
  • argon oxygen decarburization decarburization with argon-oxygen.
  • the steel obtained can be subjected to remelting under slag, in particular when it is desired to produce with the composition of the thin walls and of the knife-type joints.
  • the low inclusion content guarantees superior sealing.
  • this treatment is not compulsory.
  • the parts prepared from a composition according to the present invention undergo a heat treatment at a temperature of 1000-1100 ° C. with cooling in air, oil or water depending on the size of the parts, to give a hyper-soaked state.
  • Table 1 below groups together a certain number of mechanical strength measurements carried out by three laboratories on steel bars according to the present invention.
  • the specific composition of the steel used for making the test bars is as follows: Closed off ⁇ 31.75 hyper soaked ⁇ 12 hyper soaked ⁇ 12 work hardened ⁇ 45 hyper soaked Carbon 0.033 0.035 0.027 0.035 Chromium 20.89 20.69 20.10 20.69 Nickel 9.22 9.73 9.09 9.73 Manganese 4.14 3.92 4.00 3.92 Molybdenum 2.10 2.14 2.10 2.14 Silicon 0.36 0.42 0.37 0.42 Phosphorus 0.022 0.021 0.021 0.021 Sulfur ⁇ 0.002 ⁇ 0.002 ⁇ 0.002 ⁇ 0.002 Niobium 0.32 0.30 0.30 0.30 0.30 0.30 0.30 Nitrogen 0.42 0.427 0.419 0.427
  • the rate of work hardening which one applies possibly depends on the mechanical characteristics which one wishes to obtain and the single figure shows the evolution of the mechanical characteristics Rm and Rp 0.2% according to the rate of work hardening.
  • the material is therefore classified as non-magnetic at a temperature of 1.8K.
  • the stainless steel compositions according to the present invention give parts having mechanical characteristics and non-magnetic properties which make them particularly suitable for the realization of installations in ultra-vacuum and / or at very low temperature; they find a particular application in installations analysis of elementary particles and the creation of cryogenic motors.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Soft Magnetic Materials (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Crucibles And Fluidized-Bed Furnaces (AREA)
  • Hard Magnetic Materials (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
EP93401364A 1992-06-04 1993-05-28 Composition d'acier inoxydable pour pièces utilisées en ultravide et à basse température Expired - Lifetime EP0573335B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9206771A FR2691982B1 (fr) 1992-06-04 1992-06-04 Composition d'acier inoxydable pour pièces utilisées en ultravide et à basse température.
FR9206771 1992-06-04

Publications (2)

Publication Number Publication Date
EP0573335A1 EP0573335A1 (fr) 1993-12-08
EP0573335B1 true EP0573335B1 (fr) 1997-02-26

Family

ID=9430430

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93401364A Expired - Lifetime EP0573335B1 (fr) 1992-06-04 1993-05-28 Composition d'acier inoxydable pour pièces utilisées en ultravide et à basse température

Country Status (7)

Country Link
EP (1) EP0573335B1 (el)
AT (1) ATE149212T1 (el)
DE (2) DE573335T1 (el)
DK (1) DK0573335T3 (el)
ES (1) ES2048128T3 (el)
FR (1) FR2691982B1 (el)
GR (2) GR940300003T1 (el)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1055011A1 (en) * 1997-12-23 2000-11-29 Allegheny Ludlum Corporation Austenitic stainless steel including columbium
KR20210100212A (ko) 2011-05-26 2021-08-13 유나이티드 파이프라인스 아시아 패시픽 피티이 리미티드 오스테나이트계 스테인리스강

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1205289B (de) * 1964-05-27 1965-11-18 Phoenix Rheinrohr Ag Verwendung einer austenitischen Stahllegierung als Werkstoff fuer geschweisste Bauteile, die dem Angriff von Seewasser und/oder Meeres-atmosphaere ausgesetzt sind
JPS5424364B2 (el) * 1973-05-04 1979-08-21
SU521350A1 (ru) * 1974-07-16 1976-07-15 Физико-Механический Институт Ордена Ленина Ан Украинской Сср Коррозионностойка сталь
US4099966A (en) * 1976-12-02 1978-07-11 Allegheny Ludlum Industries, Inc. Austenitic stainless steel

Also Published As

Publication number Publication date
ES2048128T3 (es) 1997-05-01
ES2048128T1 (es) 1994-03-16
FR2691982B1 (fr) 1994-08-26
EP0573335A1 (fr) 1993-12-08
DK0573335T3 (da) 1997-03-17
GR940300003T1 (en) 1994-02-28
GR3022903T3 (en) 1997-06-30
DE69308234D1 (de) 1997-04-03
FR2691982A1 (fr) 1993-12-10
DE69308234T2 (de) 1997-06-12
DE573335T1 (de) 1994-04-21
ATE149212T1 (de) 1997-03-15

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