WO2004048631A1 - Piece d’acier de construction soudable et procede de fabrication - Google Patents
Piece d’acier de construction soudable et procede de fabrication Download PDFInfo
- Publication number
- WO2004048631A1 WO2004048631A1 PCT/FR2003/003361 FR0303361W WO2004048631A1 WO 2004048631 A1 WO2004048631 A1 WO 2004048631A1 FR 0303361 W FR0303361 W FR 0303361W WO 2004048631 A1 WO2004048631 A1 WO 2004048631A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- less
- steel
- equal
- contents
- temperature
- Prior art date
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
Definitions
- the present invention relates to weldable structural steel parts and their method of manufacture.
- the structural steels must have a certain level of mechanical characteristics to be adapted to the use that one wishes to make, and they must in particular have a high hardness.
- steels are used that can be quenched, that is to say for which one can obtain a martensitic or bainitic structure when cooled sufficiently quickly and efficiently.
- a bainitic critical velocity is thus defined, beyond which a bainitic, martensitic or martensite-bainitic structure is obtained, as a function of the cooling rate reached.
- the quenchability of these steels depends on their content of quenching elements. In general, the more these elements are present in large quantities, the lower the bainitic critical speed is low.
- the welding zone also known as the Zone Affectée Thermiquement or ZAT
- ZAT Zone Affectée Thermiquement
- C eq (% C +% Mn / 6 + (% Cr + ( % Mo +% W / 2) +% V) / 5 +% Ni / 15)
- the lower its equivalent carbon the more the steel is weldable. It is therefore understandable that the improvement of the quenchability, which goes through a higher content of quenching elements, is at the expense of weldability.
- the object of the present invention is to overcome this drawback by proposing a structural steel having improved quenchability without reducing its weldability.
- the invention firstly relates to a piece of weldable structural steel whose chemical composition comprises, by weight:
- N ⁇ 0.025% optionally at least one element selected from V, Nb, Ta, S and Ca, in contents of less than 0.3%, and / or among Ti and Zr in contents of less than or equal to 0.5%, the rest being iron and impurities resulting from the elaboration, the contents of aluminum, boron, titanium and nitrogen, expressed in thousandths of a%, of said composition further satisfying the following relationship:
- the silicon and aluminum contents of the composition furthermore satisfying the following conditions: if C> 0.145, then Si + Al ⁇ 0.95 and whose structure is bainitic, martensitic or martensite-bainitic and furthermore comprises from 3 to 20 % residual austenite, preferably 5 to 20% residual austenite.
- the chemical composition of the steel of the piece according to the invention also satisfies the relationship:
- the chemical composition the steel of the piece according to the invention furthermore satisfies the relationship:% Cr + 3 (% Mo +% W / 2) ⁇ 1, 8, preferably> 2.0.
- the subject of the invention is also a method for manufacturing a weldable steel part according to the invention, characterized in that:
- the room is austenitized by heating at a temperature between Ac 3 and 1000 ° C., preferably between Ac 3 and 950 ° C., and then it cools to a temperature of 200 ° C or lower so that in the center of the room the cooling rate between 800 ° C and 500 ° C is greater than or equal to the bainitic critical speed, makes an income at a temperature less than or equal to Ac,
- the cooling rate may be slowed down, in particular to promote a phenomenon of self-income and the retention of 3 % to 20% residual austenite.
- the cooling rate between 500 ° C and a temperature less than or equal to 200 ° C will then be between 0.07 ° C / s and 5 ° C / s; more preferably between 0.15 ° C / s and 2.5 ° C / s.
- an income is made at a temperature below 300 ° C for a time less than 10 hours, after cooling to a temperature of less than or equal to 200 ° C.
- the process according to the invention does not comprise any income after the cooling of the part to a temperature of less than or equal to 200 ° C.
- the part subjected to the process according to the invention is a sheet of thickness between 3 and 150 mm.
- the third subject of the invention is a process for manufacturing a weldable steel sheet according to the invention, whose thickness is between 3 mm and 150 mm, and which is characterized in that a quenching of said sheet, the cooling rate V R at the core of the sheet between 800 ° C and
- the improvement of the quenchability makes it possible to cool the pieces more slowly, while guaranteeing an essentially bainitic, martensitic or martensite-bainitic structure.
- This slower cooling combined with a sufficient content of carburigenic elements then allows the precipitation of fine carbides of chromium, molybdenum and / or tungsten by a so-called self-tempering phenomenon.
- This phenomenon of self-income is, moreover, greatly favored by the slowing down of the cooling rate below 500 ° C.
- this slowdown also favors the retention of austenite, preferably in a proportion of between 3% and 20%.
- the manufacturing process is thus simplified while improving the mechanical characteristics of the steel, which no longer undergoes significant softening due to high temperature tempering, as is customary. It remains however possible to make such an income at usual temperatures, that is to say less than or equal to A.
- the steel of the piece according to the invention contains, by weight: - more than 0.10% o carbon, to allow to obtain sufficient hardness, but less than 0.22% to obtain excellent weldability, good cutability, good bendability and satisfactory toughness;
- the sum% Cr + 3 (% Mo +% W / 2) is preferably greater than 1.8%, and particularly preferably greater than 2.0%, in order to possibly limit the income to 300 ° C, or even delete it;
- V, Nb, Ta, S and Ca optionally at least one element selected from V, Nb, Ta, S and Ca, in contents of less than 0.3% ", and / or among Ti and Zr in contents of less than or equal to 0.5%" and / or or aluminum at less than 0.9%.
- V, Nb, Ta, Ti, Zr makes it possible to obtain precipitation hardening without excessively deteriorating the weldability.
- Titanium, zirconium and aluminum can be used to fix the nitrogen present in the steel which protects the boron, titanium can be replaced in whole or in part by a double weight of Zr. Sulfur and calcium improve the machinability of the grade.
- Aluminum is limited to 0.9% to avoid any clogging of the pipes during casting.
- a steel according to the invention is produced, it is cast in the form of a half product which is then shaped by hot plastic deformation, for example by rolling or forging.
- the part thus obtained is then austenitized by heating at a temperature above Ac 3 but below 1000 ° C., and preferably below 950 ° C., and then cooled to room temperature so that, at the heart of the piece, the cooling rate between 800 ° C and 500 ° C is greater than the bainitic critical speed.
- the austenitization temperature is limited to 1000 ° C., since beyond this, the quenching effect of the boron becomes too weak.
- the part is then optionally subjected to a conventional feed at a temperature less than or equal to A ⁇ ,, but it is preferred to limit the temperature to 300 ° C, or even to eliminate this step.
- the absence of income can be, possibly, compensated by a phenomenon of self-income.
- This is particularly favored by allowing a cooling rate at low temperature (that is to say below about 500 ° C) preferably between 0.07 s and 5 s; more preferably between 0.15 ° C / s and 2.5 ° C / s.
- a cooling rate at low temperature that is to say below about 500 ° C
- V1 From this velocity V1 is deduced the maximum sheet thicknesses that can be obtained while maintaining a substantially martensitic core structure and also comprising at least 3% residual austenite. These thicknesses were determined in the case of air quenching (A), oil
- the improvement of the quenchability thus makes it possible to manufacture parts having a core hardened structure under less stringent cooling conditions than those of the prior art and / or in greater maximum thicknesses.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials 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)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
Description
Claims
Priority Applications (12)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0315696-6B1A BR0315696B1 (pt) | 2002-11-19 | 2003-11-13 | peÇa de aÇo de construÇço soldÁvel, processo para a fabricaÇço de uma peÇa de aÇo soldÁvel e processo para a fabricaÇço de uma chapa de aÇo soldÁvel |
JP2004554597A JP4535879B2 (ja) | 2002-11-19 | 2003-11-13 | 溶接可能な鋼建築構成部材およびその製造方法 |
UAA200505983A UA80010C2 (en) | 2002-11-19 | 2003-11-13 | Detail or method for producing of detail or plate from the constructional steel, suitable for welding |
AU2003294049A AU2003294049B2 (en) | 2002-11-19 | 2003-11-13 | Weldable steel building component and method for making same |
SI200330933T SI1563110T1 (sl) | 2002-11-19 | 2003-11-13 | Kos konstrukcijskega jekla, ki se da variti, in postopek za izdelavo |
KR1020057009040A KR101051934B1 (ko) | 2002-11-19 | 2003-11-13 | 용접용 강 빌딩 구성요소 및 그 제조방법 |
US10/535,306 US7754031B2 (en) | 2002-11-19 | 2003-11-13 | Weldable steel building component and method for making same |
EP03789465A EP1563110B1 (fr) | 2002-11-19 | 2003-11-13 | Piece d'acier de construction soudable et procede de fabrication |
DK03789465T DK1563110T3 (da) | 2002-11-19 | 2003-11-13 | Svejsbart konstruktionsstålemne og fremgangsmåde til fremstilling heraf |
CA2506353A CA2506353C (fr) | 2002-11-19 | 2003-11-13 | Piece d'acier de construction soudable et procede de fabrication |
DE60315182T DE60315182T2 (de) | 2002-11-19 | 2003-11-13 | Werkstück aus schweisbarem baustahl und verfahren zum herstellen |
ZA2005/04149A ZA200504149B (en) | 2002-11-19 | 2005-05-23 | Weldable steel building component and method for making same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0214422 | 2002-11-19 | ||
FR0214422A FR2847273B1 (fr) | 2002-11-19 | 2002-11-19 | Piece d'acier de construction soudable et procede de fabrication |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004048631A1 true WO2004048631A1 (fr) | 2004-06-10 |
WO2004048631A8 WO2004048631A8 (fr) | 2005-06-30 |
Family
ID=32187693
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2003/003361 WO2004048631A1 (fr) | 2002-11-19 | 2003-11-13 | Piece d’acier de construction soudable et procede de fabrication |
Country Status (22)
Country | Link |
---|---|
US (1) | US7754031B2 (fr) |
EP (1) | EP1563110B1 (fr) |
JP (1) | JP4535879B2 (fr) |
KR (1) | KR101051934B1 (fr) |
CN (1) | CN100396810C (fr) |
AR (1) | AR042069A1 (fr) |
AT (1) | ATE368134T1 (fr) |
AU (1) | AU2003294049B2 (fr) |
BR (1) | BR0315696B1 (fr) |
CA (1) | CA2506353C (fr) |
DE (1) | DE60315182T2 (fr) |
DK (1) | DK1563110T3 (fr) |
ES (1) | ES2291728T3 (fr) |
FR (1) | FR2847273B1 (fr) |
PE (1) | PE20040485A1 (fr) |
PL (1) | PL209397B1 (fr) |
PT (1) | PT1563110E (fr) |
RU (1) | RU2321668C2 (fr) |
SI (1) | SI1563110T1 (fr) |
UA (1) | UA80010C2 (fr) |
WO (1) | WO2004048631A1 (fr) |
ZA (1) | ZA200504149B (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006133668A1 (fr) * | 2005-06-16 | 2006-12-21 | Georgsmarienhütte Gmbh | Acier pour realiser des pieces d'usure destinees a l'industrie des engins de chantier |
EP1832667A1 (fr) * | 2006-03-07 | 2007-09-12 | ARCELOR France | Procédé de fabrication de tôles d'acier à très hautes caractéristiques de résistance, de ductilité et de tenacité, et tôles ainsi produites |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2430839T3 (es) | 2006-09-29 | 2013-11-22 | Ezm Edelstahlzieherei Mark Gmbh | Acero de alta resistencia y usos de un acero de este tipo |
ES2391312T3 (es) * | 2008-03-10 | 2012-11-23 | Swiss Steel Ag | Producto longitudinal laminado en caliente y procedimiento para su fabricación |
BRPI0901378A2 (pt) * | 2009-04-03 | 2010-12-21 | Villares Metals Sa | aço bainìtico para moldes |
FI20115702L (fi) * | 2011-07-01 | 2013-01-02 | Rautaruukki Oyj | Menetelmä suurlujuuksisen rakenneteräksen valmistamiseksi ja suurlujuuksinen rakenneteräs |
CN102400052B (zh) * | 2011-11-29 | 2013-05-15 | 宁波万冠精密铸造厂 | 窄淬透性齿轮钢的制备方法 |
CA2877175C (fr) * | 2012-05-25 | 2023-07-25 | Gary M. Cola | Micro-traitement et microstructure de carbure contenant un alliage a base de fer |
CN103469102B (zh) * | 2013-09-30 | 2015-09-30 | 南阳汉冶特钢有限公司 | 一种塔式起重机用钢hg785d及生产方法 |
CN104060177A (zh) * | 2014-07-01 | 2014-09-24 | 南通志邦新材料科技有限公司 | 一种高韧性弹簧钢 |
DE102014017274A1 (de) * | 2014-11-18 | 2016-05-19 | Salzgitter Flachstahl Gmbh | Höchstfester lufthärtender Mehrphasenstahl mit hervorragenden Verarbeitungseigenschaften und Verfahren zur Herstellung eines Bandes aus diesem Stahl |
CN108474080B (zh) * | 2015-11-16 | 2021-09-21 | 本特勒尔钢管有限公司 | 具有高能量吸收能力的钢合金和钢管产品 |
PT3168312T (pt) * | 2015-11-16 | 2019-07-16 | Deutsche Edelstahlwerke Specialty Steel Gmbh & Co Kg | Aço estrutural de alta qualidade com estrutura bainítica, peça forjada e método para a produção de peça forjada |
SE543967C2 (en) * | 2020-02-11 | 2021-10-12 | Blykalla Reaktorer Stockholm Ab | A martensitic steel |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
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US4854976A (en) * | 1988-07-13 | 1989-08-08 | China Steel Corporation | Method of producing a multi-phase structured cold rolled high-tensile steel sheet |
JPH01298116A (ja) * | 1988-05-26 | 1989-12-01 | Kawasaki Steel Corp | 高張力pc鋼棒の製造方法 |
JPH0331443A (ja) * | 1989-06-29 | 1991-02-12 | Aichi Steel Works Ltd | 熱間鍛造用強靭非調質鋼 |
JPH04297548A (ja) * | 1991-03-27 | 1992-10-21 | Kobe Steel Ltd | 高強度高靭性非調質鋼とその製造方法 |
JPH0617188A (ja) * | 1992-03-11 | 1994-01-25 | Nkk Corp | 加工性および溶接性に優れた耐摩耗鋼 |
WO1996022396A1 (fr) * | 1995-01-20 | 1996-07-25 | British Steel Plc | Perfectionnements apportes aux aciers bainitiques exempts de carbure, et procedes de production d'aciers de ce type |
EP0725156A1 (fr) * | 1995-01-31 | 1996-08-07 | CREUSOT LOIRE INDUSTRIE (Société Anonyme) | Acier à haute ductilité, procédé de fabrication et utilisation |
JPH11279690A (ja) * | 1998-03-31 | 1999-10-12 | Nippon Steel Corp | 疲労特性に優れた加工用高強度冷延鋼板およびその製造方法 |
EP0974678A1 (fr) * | 1998-07-21 | 2000-01-26 | Creusot-Loire Industrie | Procédé et acier pour la fabrication d'une enceinte chaudronnée, travaillant en présence d'hydrogène sulfuré |
EP0974677A1 (fr) * | 1997-01-29 | 2000-01-26 | Nippon Steel Corporation | Tole d'acier a haute resistance mecanique, tres resistante a la deformation dynamique et d'une excellente ouvrabilite, et son procede de fabrication |
US6159312A (en) * | 1997-12-19 | 2000-12-12 | Exxonmobil Upstream Research Company | Ultra-high strength triple phase steels with excellent cryogenic temperature toughness |
Family Cites Families (6)
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US4171233A (en) * | 1978-05-22 | 1979-10-16 | Bethlehem Steel Corporation | Lens quality of die steel |
JPS58136716A (ja) * | 1982-01-28 | 1983-08-13 | Nippon Steel Corp | 加工用強高度低降伏比複合組織熱延鋼板の製造方法 |
BE1011149A3 (fr) * | 1997-05-12 | 1999-05-04 | Cockerill Rech & Dev | Acier ductile a haute limite elastique et procede de fabrication de cet acier. |
JP2000355735A (ja) * | 1999-06-15 | 2000-12-26 | Nippon Steel Corp | 材質バラツキの小さい加工性に優れた熱延高強度鋼板とその製造方法 |
JP3182141B2 (ja) * | 1999-12-22 | 2001-07-03 | 新日本製鐵株式会社 | 溶接性に優れた高強度高延性せん断補強筋用熱間圧延鋼材及びその製造方法 |
JP4306076B2 (ja) * | 2000-02-02 | 2009-07-29 | Jfeスチール株式会社 | 伸びフランジ性に優れた高延性熱延鋼板およびその製造方法 |
-
2002
- 2002-11-19 FR FR0214422A patent/FR2847273B1/fr not_active Expired - Lifetime
-
2003
- 2003-11-13 UA UAA200505983A patent/UA80010C2/uk unknown
- 2003-11-13 WO PCT/FR2003/003361 patent/WO2004048631A1/fr active IP Right Grant
- 2003-11-13 RU RU2005119207/02A patent/RU2321668C2/ru active
- 2003-11-13 US US10/535,306 patent/US7754031B2/en active Active
- 2003-11-13 CA CA2506353A patent/CA2506353C/fr not_active Expired - Lifetime
- 2003-11-13 JP JP2004554597A patent/JP4535879B2/ja not_active Expired - Lifetime
- 2003-11-13 BR BRPI0315696-6B1A patent/BR0315696B1/pt active IP Right Grant
- 2003-11-13 ES ES03789465T patent/ES2291728T3/es not_active Expired - Lifetime
- 2003-11-13 DK DK03789465T patent/DK1563110T3/da active
- 2003-11-13 CN CNB2003801036458A patent/CN100396810C/zh not_active Expired - Lifetime
- 2003-11-13 KR KR1020057009040A patent/KR101051934B1/ko active IP Right Grant
- 2003-11-13 PT PT03789465T patent/PT1563110E/pt unknown
- 2003-11-13 AU AU2003294049A patent/AU2003294049B2/en not_active Expired
- 2003-11-13 EP EP03789465A patent/EP1563110B1/fr not_active Expired - Lifetime
- 2003-11-13 AT AT03789465T patent/ATE368134T1/de active
- 2003-11-13 DE DE60315182T patent/DE60315182T2/de not_active Expired - Lifetime
- 2003-11-13 SI SI200330933T patent/SI1563110T1/sl unknown
- 2003-11-13 PL PL375529A patent/PL209397B1/pl unknown
- 2003-11-18 AR ARP030104255A patent/AR042069A1/es not_active Application Discontinuation
- 2003-11-18 PE PE2003001168A patent/PE20040485A1/es not_active Application Discontinuation
-
2005
- 2005-05-23 ZA ZA2005/04149A patent/ZA200504149B/en unknown
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH01298116A (ja) * | 1988-05-26 | 1989-12-01 | Kawasaki Steel Corp | 高張力pc鋼棒の製造方法 |
US4854976A (en) * | 1988-07-13 | 1989-08-08 | China Steel Corporation | Method of producing a multi-phase structured cold rolled high-tensile steel sheet |
JPH0331443A (ja) * | 1989-06-29 | 1991-02-12 | Aichi Steel Works Ltd | 熱間鍛造用強靭非調質鋼 |
JPH04297548A (ja) * | 1991-03-27 | 1992-10-21 | Kobe Steel Ltd | 高強度高靭性非調質鋼とその製造方法 |
JPH0617188A (ja) * | 1992-03-11 | 1994-01-25 | Nkk Corp | 加工性および溶接性に優れた耐摩耗鋼 |
WO1996022396A1 (fr) * | 1995-01-20 | 1996-07-25 | British Steel Plc | Perfectionnements apportes aux aciers bainitiques exempts de carbure, et procedes de production d'aciers de ce type |
EP0725156A1 (fr) * | 1995-01-31 | 1996-08-07 | CREUSOT LOIRE INDUSTRIE (Société Anonyme) | Acier à haute ductilité, procédé de fabrication et utilisation |
EP0974677A1 (fr) * | 1997-01-29 | 2000-01-26 | Nippon Steel Corporation | Tole d'acier a haute resistance mecanique, tres resistante a la deformation dynamique et d'une excellente ouvrabilite, et son procede de fabrication |
US6159312A (en) * | 1997-12-19 | 2000-12-12 | Exxonmobil Upstream Research Company | Ultra-high strength triple phase steels with excellent cryogenic temperature toughness |
JPH11279690A (ja) * | 1998-03-31 | 1999-10-12 | Nippon Steel Corp | 疲労特性に優れた加工用高強度冷延鋼板およびその製造方法 |
EP0974678A1 (fr) * | 1998-07-21 | 2000-01-26 | Creusot-Loire Industrie | Procédé et acier pour la fabrication d'une enceinte chaudronnée, travaillant en présence d'hydrogène sulfuré |
Non-Patent Citations (5)
Title |
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PATENT ABSTRACTS OF JAPAN vol. 014, no. 080 (C - 0689) 15 February 1990 (1990-02-15) * |
PATENT ABSTRACTS OF JAPAN vol. 015, no. 154 (C - 0825) 18 April 1991 (1991-04-18) * |
PATENT ABSTRACTS OF JAPAN vol. 017, no. 113 (C - 1033) 9 March 1993 (1993-03-09) * |
PATENT ABSTRACTS OF JAPAN vol. 018, no. 226 (C - 1194) 25 April 1994 (1994-04-25) * |
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 01 31 January 2000 (2000-01-31) * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006133668A1 (fr) * | 2005-06-16 | 2006-12-21 | Georgsmarienhütte Gmbh | Acier pour realiser des pieces d'usure destinees a l'industrie des engins de chantier |
EP1832667A1 (fr) * | 2006-03-07 | 2007-09-12 | ARCELOR France | Procédé de fabrication de tôles d'acier à très hautes caractéristiques de résistance, de ductilité et de tenacité, et tôles ainsi produites |
WO2007101921A1 (fr) * | 2006-03-07 | 2007-09-13 | Arcelormittal France | Procede de fabrication de tôles d1acier a tres hautes caracteristiques de resistance, de ductilite et de tenacite, et tôles ainsi produites |
US9856548B2 (en) | 2006-03-07 | 2018-01-02 | Arcelormittal France | Process for manufacturing steel sheet having very high strength, ductility and toughness characteristics, and sheet thus produced |
US10370746B2 (en) | 2006-03-07 | 2019-08-06 | Arcelormittal | Process for manufacturing steel sheet |
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