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 PDFInfo
- 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
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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%.
Landscapes
- 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)
- Semiconductor Lasers (AREA)
- Control Of Heat Treatment Processes (AREA)
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 |
---|---|---|---|
FR8408785A FR2565251B1 (fr) | 1984-06-05 | 1984-06-05 | Acier pour la fabrication de grosses pieces forgees et procede de traitement de cet acier |
FR8408785 | 1984-06-05 |
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 (ja) |
EP (1) | EP0164678B1 (ja) |
JP (1) | JPS61566A (ja) |
KR (1) | KR930003604B1 (ja) |
AT (1) | ATE42347T1 (ja) |
CS (1) | CS274262B2 (ja) |
DE (1) | DE3569576D1 (ja) |
FR (1) | FR2565251B1 (ja) |
Families Citing this family (8)
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)
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 |
-
1984
- 1984-06-05 FR FR8408785A patent/FR2565251B1/fr not_active Expired
-
1985
- 1985-06-04 JP JP60121380A patent/JPS61566A/ja active Pending
- 1985-06-04 EP EP85106869A patent/EP0164678B1/fr not_active Expired
- 1985-06-04 DE DE8585106869T patent/DE3569576D1/de not_active Expired
- 1985-06-04 AT AT85106869T patent/ATE42347T1/de not_active IP Right Cessation
- 1985-06-05 CS CS402885A patent/CS274262B2/cs unknown
- 1985-06-05 US US06/741,334 patent/US4689095A/en not_active Expired - Fee Related
- 1985-06-05 KR KR1019850003921A patent/KR930003604B1/ko not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
US4689095A (en) | 1987-08-25 |
KR860000400A (ko) | 1986-01-28 |
KR930003604B1 (ko) | 1993-05-08 |
FR2565251B1 (fr) | 1987-12-31 |
DE3569576D1 (en) | 1989-05-24 |
ATE42347T1 (de) | 1989-05-15 |
CS274262B2 (en) | 1991-04-11 |
EP0164678A1 (fr) | 1985-12-18 |
FR2565251A1 (fr) | 1985-12-06 |
CS402885A2 (en) | 1990-09-12 |
JPS61566A (ja) | 1986-01-06 |
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