EP1563110A1 - Piece d'acier de construction soudable et procede de fabrication - Google Patents
Piece d'acier de construction soudable et procede de fabricationInfo
- Publication number
- EP1563110A1 EP1563110A1 EP03789465A EP03789465A EP1563110A1 EP 1563110 A1 EP1563110 A1 EP 1563110A1 EP 03789465 A EP03789465 A EP 03789465A EP 03789465 A EP03789465 A EP 03789465A EP 1563110 A1 EP1563110 A1 EP 1563110A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- less
- steel
- equal
- contents
- temperature
- 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.)
- Granted
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 45
- 239000010959 steel Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims description 12
- 239000000203 mixture Substances 0.000 claims abstract description 20
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052796 boron Inorganic materials 0.000 claims abstract description 17
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 11
- 239000010936 titanium Substances 0.000 claims abstract description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 9
- 239000010703 silicon Substances 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 6
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 5
- 229910052742 iron Inorganic materials 0.000 claims abstract description 5
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 21
- 229910052804 chromium Inorganic materials 0.000 claims description 16
- 229910052750 molybdenum Inorganic materials 0.000 claims description 16
- 230000000171 quenching effect Effects 0.000 claims description 16
- 229910052721 tungsten Inorganic materials 0.000 claims description 16
- 238000010791 quenching Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 229910052759 nickel Inorganic materials 0.000 claims description 9
- 229910052748 manganese Inorganic materials 0.000 claims description 8
- 229910000746 Structural steel Inorganic materials 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000005496 tempering Methods 0.000 claims description 3
- 239000010949 copper Substances 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 2
- 239000004411 aluminium Substances 0.000 abstract 2
- 239000011651 chromium Substances 0.000 description 11
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000011572 manganese Substances 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 4
- 239000011733 molybdenum Substances 0.000 description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 4
- 239000010937 tungsten Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000011575 calcium Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005242 forging Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000007571 dilatometry Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
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.
- micro-alloyed boron grades were then developed, taking advantage of the fact that, in particular, the quenching efficiency of this element decreases when the austenitization temperature increases.
- the ZAT is less soaking than it would be in a grade of the same quenchability without boron, and it can thus reduce hardenability and hardness of this ZAT.
- 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 (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SI200330933T SI1563110T1 (sl) | 2002-11-19 | 2003-11-13 | Kos konstrukcijskega jekla, ki se da variti, in postopek za izdelavo |
Applications Claiming Priority (3)
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 |
PCT/FR2003/003361 WO2004048631A1 (fr) | 2002-11-19 | 2003-11-13 | Piece d’acier de construction soudable et procede de fabrication |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1563110A1 true EP1563110A1 (fr) | 2005-08-17 |
EP1563110B1 EP1563110B1 (fr) | 2007-07-25 |
Family
ID=32187693
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03789465A Expired - Lifetime EP1563110B1 (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) |
Families Citing this family (14)
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 |
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 |
PL3168312T3 (pl) * | 2015-11-16 | 2019-09-30 | Deutsche Edelstahlwerke Specialty Steel Gmbh & Co. Kg | Stopowa stal konstrukcyjna o strukturze bainitycznej, wytworzony z niej element kuty i sposób wytwarzania elementu kutego |
US11384415B2 (en) | 2015-11-16 | 2022-07-12 | Benteler Steel/Tube Gmbh | Steel alloy with high energy absorption capacity and tubular steel product |
SE543967C2 (en) * | 2020-02-11 | 2021-10-12 | Blykalla Reaktorer Stockholm Ab | A martensitic steel |
Family Cites Families (17)
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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 |
JP2698374B2 (ja) * | 1988-05-26 | 1998-01-19 | 川崎製鉄株式会社 | 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 |
JP3003451B2 (ja) * | 1992-03-11 | 2000-01-31 | 日本鋼管株式会社 | 加工性および溶接性に優れた耐摩耗鋼 |
GB2297094B (en) * | 1995-01-20 | 1998-09-23 | British Steel Plc | Improvements in and relating to Carbide-Free Bainitic Steels |
FR2729974B1 (fr) * | 1995-01-31 | 1997-02-28 | Creusot Loire | Acier a haute ductilite, procede de fabrication et utilisation |
US6544354B1 (en) * | 1997-01-29 | 2003-04-08 | Nippon Steel Corporation | High-strength steel sheet highly resistant to dynamic deformation and excellent in workability and process for the production thereof |
BE1011149A3 (fr) * | 1997-05-12 | 1999-05-04 | Cockerill Rech & Dev | Acier ductile a haute limite elastique et procede de fabrication de cet acier. |
US6159312A (en) * | 1997-12-19 | 2000-12-12 | Exxonmobil Upstream Research Company | Ultra-high strength triple phase steels with excellent cryogenic temperature toughness |
JP3749615B2 (ja) * | 1998-03-31 | 2006-03-01 | 新日本製鐵株式会社 | 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 |
FR2781506B1 (fr) * | 1998-07-21 | 2000-08-25 | Creusot Loire | Procede et acier pour la fabrication d'une enceinte chaudronnee travaillant en presence d'hydrogene sulfure |
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 DK DK03789465T patent/DK1563110T3/da active
- 2003-11-13 AU AU2003294049A patent/AU2003294049B2/en not_active Expired
- 2003-11-13 UA UAA200505983A patent/UA80010C2/uk unknown
- 2003-11-13 PL PL375529A patent/PL209397B1/pl unknown
- 2003-11-13 JP JP2004554597A patent/JP4535879B2/ja not_active Expired - Lifetime
- 2003-11-13 PT PT03789465T patent/PT1563110E/pt unknown
- 2003-11-13 US US10/535,306 patent/US7754031B2/en active Active
- 2003-11-13 SI SI200330933T patent/SI1563110T1/sl unknown
- 2003-11-13 AT AT03789465T patent/ATE368134T1/de active
- 2003-11-13 WO PCT/FR2003/003361 patent/WO2004048631A1/fr active IP Right Grant
- 2003-11-13 EP EP03789465A patent/EP1563110B1/fr not_active Expired - Lifetime
- 2003-11-13 BR BRPI0315696-6B1A patent/BR0315696B1/pt active IP Right Grant
- 2003-11-13 CA CA2506353A patent/CA2506353C/fr not_active Expired - Lifetime
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- 2003-11-13 CN CNB2003801036458A patent/CN100396810C/zh not_active Expired - Lifetime
- 2003-11-13 DE DE60315182T patent/DE60315182T2/de not_active Expired - Lifetime
- 2003-11-13 KR KR1020057009040A patent/KR101051934B1/ko active IP Right Grant
- 2003-11-18 AR ARP030104255A patent/AR042069A1/es not_active Application Discontinuation
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