EP0164678B1 - Acier pour la fabrication de grosses pièces forgées et procédé de traitement de cet acier - Google Patents

Acier pour la fabrication de grosses pièces forgées et procédé de traitement de cet acier Download PDF

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Publication number
EP0164678B1
EP0164678B1 EP85106869A EP85106869A EP0164678B1 EP 0164678 B1 EP0164678 B1 EP 0164678B1 EP 85106869 A EP85106869 A EP 85106869A EP 85106869 A EP85106869 A EP 85106869A EP 0164678 B1 EP0164678 B1 EP 0164678B1
Authority
EP
European Patent Office
Prior art keywords
temperature
lying
less
steel
range
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
Application number
EP85106869A
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German (de)
English (en)
French (fr)
Other versions
EP0164678A1 (fr
Inventor
André Coulon
Chantal Loier
Jean-Pierre Badeau
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.)
Alstom SA
Original Assignee
Alstom SA
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 Alstom SA filed Critical Alstom SA
Priority to AT85106869T priority Critical patent/ATE42347T1/de
Publication of EP0164678A1 publication Critical patent/EP0164678A1/fr
Application granted granted Critical
Publication of EP0164678B1 publication Critical patent/EP0164678B1/fr
Expired 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/78—Combined heat-treatments not provided for above

Definitions

  • the present invention relates to a steel for the manufacture of large forged parts in particular of turbine rotors.
  • the steel according to the invention makes it possible to improve the mechanical properties both in the ambient and in the hot and can be used with steam at 600 ° C.
  • the invention relates to a composition of highly alloyed steel for large forgings for which the addition of Niobium, usual for a steel having hot high resistance to creep is limited correlatively with the addition of nitrogen, the whole elements of addition which must achieve a balance in view avoid the presence of residual ferrite in the structure.
  • an "unbalanced" composition can cause an excess of ferrite in the structure of large parts. We manage to exclude it by carefully dosing the contents of additives.
  • a fairly precise method for carrying out this assay is that of "equivalent chromium and nickel" allowing, by means of coefficients assigned to each element, to assess its aptitude for the formation of ferrite (element alphagenes) and the formation of austenite ( gamma elements).
  • alphagenic elements we find Si, Or, Mo, H, V, Nb, Ti, AI.
  • the gamma elements are C, Mn, Ni, Co and Cu.
  • An alloy composition in accordance with the invention will have, on the basis of the above, a chromium equivalent of between 14.5 and 15.5 and more advantageously between 14.7 and 15.3 a nickel equivalent of between 9 and 10, 2, the optimum ratio between the chromium equivalent and the nickel equivalent should be between 1.49 and 1.65.
  • FIG. 1 represents a diagram where the chrome equivalent is plotted on the abscissa and the nickel equivalent is plotted on the ordinate.
  • the final structures obtained appear in FIG. 1, the straight lines plotted conventionally indicating the passage from one structure to another (A being austenite, M being martensite and 8 F being delta-ferrite).
  • the rectangle a b c d represents the chemical analysis zone limited by the extremes of the conventionally used compositions (7.25 ⁇ Ni eq ⁇ 11.72 and 13.12 ⁇ Cr eq ⁇ 16.65).
  • the optimum is obtained inside the small rectangle efgh (see figure 2) corresponding to 9 ⁇ Ni eq ⁇ 10.2 and 14.5 ⁇ Or eq ⁇ 15.5 in the area ifjkh 1 of this small rectangle between the two lines D and D 'given by the ratio Gold eq / Ni eq equal to 1.49 and 1.65 according to the invention.
  • the part in the alloy according to the invention is subjected after forging to a determined heat treatment.
  • the description which is given below relates to a forged part with a diameter of 1400 mm with a weight of approximately 30 tonnes.
  • this income may include several stages: a first temperature rise up to approximately 560 ° C (540 - 600 ° C) with maintenance for at least 25 h (up to 48 h).
  • a second tempering is carried out to complete the transformation of the possibly remaining austenite into martensite and give the desired characteristics to the part. This treatment is done at a temperature between 650 and 710 ° C (the optimum being around 685 ° C) for a time similar to the first tempering.
  • an expansion treatment will be carried out at a temperature approximately 50 ° C lower than the temperature of the second tempering, with maintenance lasting 25 to 48 hours.
  • the 5d elongations at break are between 13.5 and 21%
  • the necking at break is between 41 and 70%.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Articles (AREA)
  • Forging (AREA)
  • Control Of Heat Treatment Processes (AREA)
  • Semiconductor Lasers (AREA)
EP85106869A 1984-06-05 1985-06-04 Acier pour la fabrication de grosses pièces forgées et procédé de traitement de cet acier Expired EP0164678B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85106869T ATE42347T1 (de) 1984-06-05 1985-06-04 Stahl fuer die herstellung von grossen schmiedestuecken und verfahren zur behandlung dieses stahles.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8408785 1984-06-05
FR8408785A FR2565251B1 (fr) 1984-06-05 1984-06-05 Acier pour la fabrication de grosses pieces forgees et procede de traitement de cet acier

Publications (2)

Publication Number Publication Date
EP0164678A1 EP0164678A1 (fr) 1985-12-18
EP0164678B1 true EP0164678B1 (fr) 1989-04-19

Family

ID=9304714

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85106869A Expired EP0164678B1 (fr) 1984-06-05 1985-06-04 Acier pour la fabrication de grosses pièces forgées et procédé de traitement de cet acier

Country Status (8)

Country Link
US (1) US4689095A (cs)
EP (1) EP0164678B1 (cs)
JP (1) JPS61566A (cs)
KR (1) KR930003604B1 (cs)
AT (1) ATE42347T1 (cs)
CS (1) CS274262B2 (cs)
DE (1) DE3569576D1 (cs)
FR (1) FR2565251B1 (cs)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62222027A (ja) * 1986-03-25 1987-09-30 Nippon Chiyuutankou Kk 耐熱ロ−タ−の製造法
JPH0621323B2 (ja) * 1989-03-06 1994-03-23 住友金属工業株式会社 耐食、耐酸化性に優れた高強度高クロム鋼
SE9002276D0 (sv) * 1990-06-28 1990-06-28 Abb Powdermet Ab Saett att framstaella fulltaeta kroppar av varmhaallfast martensitiskt cr-staal
FR2746333B1 (fr) * 1996-03-22 1998-04-24 Usinor Sacilor Procede de coulee continue d'une bande d'acier inoxydable austenitique sur une ou entre deux parois mobiles dont les surfaces sont pourvues de fossettes, et installation de coulee pour sa mise en oeuvre
KR20040012227A (ko) * 2002-08-01 2004-02-11 서명원 재봉기의 구동 및 흡진장치
US7591909B2 (en) * 2007-08-23 2009-09-22 Transportation Technology Center, Inc. Railroad wheel steels having improved resistance to rolling contact fatigue
KR101444750B1 (ko) * 2012-08-31 2014-09-26 한국원자력연구원 템퍼취화 저항성이 향상된 니켈-크롬-몰리브덴계 저합금강 및 이의 제조방법
CN103774061B (zh) * 2014-01-07 2015-11-18 无锡市派克重型铸锻有限公司 叶环锻件及其制作工艺

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB833240A (en) * 1956-07-18 1960-04-21 Firth Vickers Stainless Steels Ltd Improvements relating to ferritic alloy steels
FR1407452A (fr) * 1964-09-10 1965-07-30 Gen Electric Alliage pour fabrication de grosses pièces forgées présentant de bonnes propriétés à température ambiante et à haute température
US3767390A (en) * 1972-02-01 1973-10-23 Allegheny Ludlum Ind Inc Martensitic stainless steel for high temperature applications
JPS5226311A (en) * 1975-08-26 1977-02-26 Mitsubishi Heavy Ind Ltd High-chrome steel for high temperature parts
JPS57123964A (en) * 1981-01-26 1982-08-02 Toshiba Corp Heat resistant 12% cr steel
JPS5837159A (ja) * 1981-08-26 1983-03-04 Hitachi Ltd マルテンサイト系耐熱鋼
JPS58110661A (ja) * 1981-12-25 1983-07-01 Hitachi Ltd 耐熱鋼

Also Published As

Publication number Publication date
US4689095A (en) 1987-08-25
KR930003604B1 (ko) 1993-05-08
CS402885A2 (en) 1990-09-12
EP0164678A1 (fr) 1985-12-18
DE3569576D1 (en) 1989-05-24
JPS61566A (ja) 1986-01-06
KR860000400A (ko) 1986-01-28
ATE42347T1 (de) 1989-05-15
CS274262B2 (en) 1991-04-11
FR2565251A1 (fr) 1985-12-06
FR2565251B1 (fr) 1987-12-31

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