EP0506768A1 - Fil d'acier ayant une structure de type bainite inferieure ecrouie; procede pour produire ce fil. - Google Patents
Fil d'acier ayant une structure de type bainite inferieure ecrouie; procede pour produire ce fil.Info
- Publication number
- EP0506768A1 EP0506768A1 EP91901457A EP91901457A EP0506768A1 EP 0506768 A1 EP0506768 A1 EP 0506768A1 EP 91901457 A EP91901457 A EP 91901457A EP 91901457 A EP91901457 A EP 91901457A EP 0506768 A1 EP0506768 A1 EP 0506768A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wire
- equal
- steel
- work hardening
- heat treatment
- 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
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
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
- Y10T428/12556—Organic component
- Y10T428/12562—Elastomer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12861—Group VIII or IB metal-base component
- Y10T428/12903—Cu-base component
- Y10T428/12917—Next to Fe-base component
- Y10T428/12924—Fe-base has 0.01-1.7% carbon [i.e., steel]
Definitions
- the invention relates to metal wires and methods for obtaining these wires. These threads are used for example to reinforce plastic or rubber articles, in particular pipes, belts, plies, tire casings.
- the son of this type commonly used today are made of steel containing at least 0-6% carbon, this steel having a hardened pearlitic structure.
- the breaking strength of these wires is around 2800 MPa (megapascals), their diameter generally varies from 0.15 to 0.35 mm, and their elongation at break is between 0.4 and 2%.
- These wires are produced by drawing a starting wire, called “machine wire", the diameter of which is of the order of 5 to 6 mm, the structure of this machine wire being a hard structure, consisting of perlite and ferrite. with a high rate of perlite which is generally greater than 72%.
- the drawing operation is interrupted at least once to carry out one or more heat treatments which make it possible to regenerate the initial structure.
- the raw material is expensive, because the carbon content is relatively high;
- the wires themselves have a resistance to breaking which is sometimes insufficient, and their resistance to fatigue is limited, probably as a result of damage to these wires during the drawing before heat treatment, because of the high hardness of the wire rod.
- Japanese patent application published under No. 54-79119 describes a process for preparing a boron steel wire of bainitic structure by heating in a fluidized bed.
- the wires obtained are characterized by poor mechanical properties.
- the object of the invention is to provide a hardened metal wire having a non-pearlitic structure and having a breaking strength and an elongation at break at least as high as known hardened pearlitic steel wires, and less damage. than known sons.
- Another object of the invention is to propose a method which does not have the aforementioned drawbacks for producing this yarn.
- a) it is constituted at least in part by a steel having a carbon content at least equal to 0.1% and at most equal 0.6%, and a boron content of less than 8 ppm (parts per million);
- the steel of the wire has a structure of the lower bainite type which has collapsed;
- the diameter of the wire varies from 0.10 to 0.40 mm;
- the breaking strength of the wire is at least equal to 2800 MPa;
- the elongation at break of the wire is at least equal to 0.4%.
- a steel wire rod is hardened, this steel having a carbon content at least equal to 0.1% and at most equal to 0.6% and a boron content less than 8 ppm (parts per million), this steel with 28% to 90% proeutectoid ferrite and 72% to 10% perlite; the rate of deformation ⁇ of this work hardening being at least equal to 3;
- a work hardening is carried out on the wire having undergone this heat treatment, the temperature of the wire during this work hardening being less than 0.3 T-_, the rate of deformation ⁇ of this work hardening being at least equal to 3.
- the invention also relates to assemblies comprising at least one wire according to the invention.
- the invention also relates to articles reinforced at least in part by wires or assemblies in accordance with the preceding definitions, such articles being, for example, hoses, belts, plies, tire casings.
- FIG. 1 shows the structure of the steel of a wire before heat treatment, during the implementation of the process according to the invention
- FIG. 2 shows the structure of the steel of a wire after heat treatment, during the implementation of the process according to the invention
- FIG. 3 shows the structure of the steel of a wire according to the invention.
- all the percentages and ppm of composition indicated are by weight and the measurements of breaking strength and elongation at break are carried out according to the AFNOR NFA 03-151 method.
- an unworked wire rod 5.5 mm in diameter is used.
- This wire rod is made of steel, the characteristics of which are as follows:
- the machine wire is descaled, it is coated with a drawing soap, for example borax, and it is " dry drawn to obtain a wire with a diameter of 1.1 mm, which corresponds to a rate of deformation ⁇ slightly greater than 3.2.
- a drawing soap for example borax
- the drawing is easily carried out thanks to the relatively ductile structure of the wire rod.
- a steel with 0.7% carbon not hardened has a breaking strength R of approximately 900 MPa and an elongation at break of approximately 8%, that is to say that it is significantly less ductile.
- the drawing described above is carried out at a temperature below 0.3 -._ ,, for the purpose of simplification, although this is not essential, the drawing temperature possibly being equal to or exceeding 0.3 T_.
- FIG. 1 represents the longitudinal section of a portion 1 of the structure of the wire thus obtained.
- This structure consists of elongated blocks 2 of cementite and elongated blocks 3 of ferrite, the largest dimension of these blocks being oriented in the drawing direction.
- the following heat treatment is then carried out on the wire thus obtained:
- the wire is then cooled to 400 ° C in a salt bath in less than 2 seconds, and the wire is kept at this temperature for 1 minute, then it is cooled to around 20 ° C, that is to say at room temperature.
- FIG. 2 represents a section of a portion 4 of the structure of the wire thus obtained.
- This structure of the lower bainite type, consists of precipitates of carbide 5, distributed in a practically homogeneous manner in a matrix 6 of ferrite. This structure is obtained thanks to the preceding heat treatment, and it is preserved during cooling to room temperature.
- the precipitates 5 generally have dimensions at least equal to 0.005 ⁇ m (micrometer) and at most equal to 0.5 ⁇ m.
- FIG. 3 represents a longitudinal section of the portion 7 of this wire according to the invention thus obtained.
- This portion 7 has a structure of the lower bainite type collapsed consisting of carbides 8 of elongated shape which are practically parallel to each other and whose largest dimension is oriented along the axis of the wire, that is to say along the direction of drawing shown schematically by the arrow F in FIG. 3. These carbides 8 are arranged in a hardened ferritic matrix 9.
- This wire according to the invention has a breaking strength of 3200 MPa and an elongation at break of 0.7%.
- the machine wire is descaled, it is coated with a layer of wire-drawing soap, for example borax, and it is drawn dry to obtain a wire with a diameter of 0.9 mm, which corresponds to a rate of deformation ⁇ slightly higher than 3.6.
- the structure obtained is similar to that shown in FIG. 1.
- the following heat treatment is then carried out on the wire thus obtained:
- the wire is then cooled to 370 ° C in less than 2 seconds and kept at this temperature for 90 seconds, then cooled to room temperature.
- the structure obtained is similar to that shown in FIG. 2.
- the temperature of the wire during this drawing is less than 0.3 _._ ,.
- the wire according to the invention thus obtained has a structure similar to that shown in FIG. 3.
- This wire has a breaking strength equal to 3000 MPa and an elongation at break equal to 0.9%.
- This wire according to the invention has a breaking strength equal to 3500 MPa and an elongation at break equal to 0.7%.
- the intermediate structures and the final structure are analogous to the structures previously described.
- the wire obtained has a breaking strength and an elongation at break of values at least equal to those of conventional wires, which therefore results in a breaking energy at least equal to that of conventional wires;
- the wire obtained has better resistance to corrosion than conventional wires due to its low carbon content.
- the steel of the wire according to the invention has a carbon content at least equal to 0.2% and at most equal to 0.5%.
- compositions 0.3% - Mn - 0.6%; 0.1% _ If - 0.3%? P ⁇ 0.02%; S ⁇ 0.02%; Al ⁇ 0.02%; N ⁇ 0.006%.
- the starting wire rod has a carbon content at least equal to 0.2% and at most equal to 0.5%;
- the starting wire rod has a proeutectoid ferrite content at least equal to 41%, and at most equal to 78% and a perlite content at least equal to 22% and at most equal to 59%;
- the rate of deformation ⁇ during work hardening after the structural heat treatment is at most equal to 4.5.
- the wire after heat treatment was brass-plated to facilitate its drawing, however the invention covers the cases where other wire drawing flows are used than brass, for example copper, zinc, ternary copper alloys -zinc-nickel, copper-zinc-cobalt, copper-zinc-tin, these flows being other than steel.
- wire work hardening in the previous examples is carried out by drawing, but other techniques are possible, for example rolling, possibly associated with drawing, for at least one of the work hardening operations.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
- Metal Extraction Processes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8917227A FR2656242A1 (fr) | 1989-12-22 | 1989-12-22 | Fil d'acier ayant une structure de type bainite inferieure ecrouie; procede pour produire ce fil. |
FR8917227 | 1989-12-22 | ||
PCT/FR1990/000920 WO1991009933A1 (fr) | 1989-12-22 | 1990-12-18 | Fil d'acier ayant une structure de type bainite inferieure ecrouie; procede pour produire ce fil |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0506768A1 true EP0506768A1 (fr) | 1992-10-07 |
EP0506768B1 EP0506768B1 (fr) | 1994-04-13 |
Family
ID=9388990
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91901457A Expired - Lifetime EP0506768B1 (fr) | 1989-12-22 | 1990-12-18 | Fil d'acier ayant une structure de type bainite inferieure ecrouie; procede pour produire ce fil |
Country Status (15)
Country | Link |
---|---|
US (1) | US5342700A (fr) |
EP (1) | EP0506768B1 (fr) |
JP (1) | JPH05506479A (fr) |
KR (1) | KR100223730B1 (fr) |
AU (1) | AU654121B2 (fr) |
BR (1) | BR9007935A (fr) |
CA (1) | CA2069511A1 (fr) |
DE (1) | DE69008190T2 (fr) |
ES (1) | ES2051116T3 (fr) |
FI (1) | FI94363C (fr) |
FR (1) | FR2656242A1 (fr) |
NO (1) | NO179456C (fr) |
OA (1) | OA09592A (fr) |
RU (1) | RU2070938C1 (fr) |
WO (1) | WO1991009933A1 (fr) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2672827A1 (fr) * | 1991-02-14 | 1992-08-21 | Michelin & Cie | Fil metallique comportant un substrat en acier ayant une structure de type martensite revenue ecrouie, et un revetement; procede pour obtenir ce fil. |
FR2753206B1 (fr) * | 1996-09-09 | 1998-11-06 | Inst Francais Du Petrole | Procede de fabrication de fils en acier auto-trempant, fils de forme et application a une conduite flexible |
KR20010059686A (ko) * | 1999-12-30 | 2001-07-06 | 이계안 | 프레스 소입에 의해 베이나이트 조직을 갖는 강 조성물 |
US20030070736A1 (en) * | 2001-10-12 | 2003-04-17 | Borg Warner Inc. | High-hardness, highly ductile ferrous articles |
US20040025987A1 (en) * | 2002-05-31 | 2004-02-12 | Bhagwat Anand W. | High carbon steel wire with bainitic structure for spring and other cold-formed applications |
US7717976B2 (en) * | 2004-12-14 | 2010-05-18 | L&P Property Management Company | Method for making strain aging resistant steel |
US9121080B2 (en) * | 2010-04-01 | 2015-09-01 | Kobe Steel, Ltd. | High-carbon steel wire excellent in wire drawability and fatigue property after wiredrawing |
KR102022088B1 (ko) * | 2018-02-20 | 2019-09-18 | 주식회사 삼원강재 | 강선의 제조 방법 및 장치 |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3444008A (en) * | 1966-05-09 | 1969-05-13 | William R Keough | Controlled atmosphere processing |
JPS498611B1 (fr) * | 1968-01-24 | 1974-02-27 | ||
SE335547B (fr) * | 1970-02-11 | 1971-06-01 | Fagersta Bruks Ab | |
SU449099A1 (ru) * | 1972-08-31 | 1974-11-05 | Институт металлофизики АН УССР | Способ термической обработки стальных прокатных изделий |
JPS5921370B2 (ja) * | 1976-11-02 | 1984-05-19 | 新日本製鐵株式会社 | 耐応力腐食割れ性が優れた高延性高張力線材の製造法 |
US4250226A (en) * | 1976-12-02 | 1981-02-10 | Monsanto Company | Method for producing an adhesive-coated high-strength steel reinforcing member |
JPS5389817A (en) * | 1977-01-17 | 1978-08-08 | Sumitomo Metal Ind Ltd | Manufacture of steel bar for low temperature |
JPS5479119A (en) * | 1977-12-08 | 1979-06-23 | Kobe Steel Ltd | Manufacture of high strength, high toughness steel wire rod |
DD138886A5 (de) * | 1978-09-13 | 1979-11-28 | Sodetal | Verfahren zum herstellen von langgestreckten gegenstaenden aus stahl |
FR2488279A1 (fr) * | 1980-08-08 | 1982-02-12 | Siderurgie Fse Inst Rech | Traitement par refroidissement accelere de barres en acier dans la chaude de laminage |
US4563222A (en) * | 1983-06-29 | 1986-01-07 | Sugita Wire Mfg. Co., Ltd. | High strength bolt and method of producing same |
GB8332395D0 (en) * | 1983-12-05 | 1984-01-11 | Bekaert Sa Nv | Steel wires |
US4578124A (en) * | 1984-01-20 | 1986-03-25 | Kabushiki Kaisha Kobe Seiko Sho | High strength low carbon steels, steel articles thereof and method for manufacturing the steels |
JPS60245722A (ja) * | 1984-05-21 | 1985-12-05 | Kawasaki Steel Corp | 高張力線材の製造方法 |
JPS63241136A (ja) * | 1987-03-27 | 1988-10-06 | Sumitomo Metal Ind Ltd | 耐疲労特性にすぐれた高強度細線材 |
JP2731797B2 (ja) * | 1988-12-20 | 1998-03-25 | トーア・スチール株式会社 | 非調質ボルト用鋼線材の製造方法 |
DE3934037C1 (fr) * | 1989-10-12 | 1991-02-14 | Thyssen Stahl Ag, 4100 Duisburg, De |
-
1989
- 1989-12-22 FR FR8917227A patent/FR2656242A1/fr active Pending
-
1990
- 1990-12-18 DE DE69008190T patent/DE69008190T2/de not_active Expired - Fee Related
- 1990-12-18 CA CA002069511A patent/CA2069511A1/fr not_active Abandoned
- 1990-12-18 WO PCT/FR1990/000920 patent/WO1991009933A1/fr active IP Right Grant
- 1990-12-18 AU AU69754/91A patent/AU654121B2/en not_active Ceased
- 1990-12-18 EP EP91901457A patent/EP0506768B1/fr not_active Expired - Lifetime
- 1990-12-18 BR BR909007935A patent/BR9007935A/pt not_active IP Right Cessation
- 1990-12-18 US US07/861,846 patent/US5342700A/en not_active Expired - Fee Related
- 1990-12-18 RU SU905052528A patent/RU2070938C1/ru active
- 1990-12-18 JP JP91501848A patent/JPH05506479A/ja active Pending
- 1990-12-18 ES ES91901457T patent/ES2051116T3/es not_active Expired - Lifetime
-
1992
- 1992-06-02 FI FI922544A patent/FI94363C/fi active
- 1992-06-04 OA OA60227A patent/OA09592A/fr unknown
- 1992-06-19 NO NO922419A patent/NO179456C/no unknown
- 1992-06-20 KR KR1019920701475A patent/KR100223730B1/ko not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO9109933A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPH05506479A (ja) | 1993-09-22 |
NO179456C (no) | 1996-10-09 |
RU2070938C1 (ru) | 1996-12-27 |
FI922544A (fi) | 1992-06-02 |
AU6975491A (en) | 1991-07-24 |
AU654121B2 (en) | 1994-10-27 |
FI922544A0 (fi) | 1992-06-02 |
NO922419L (no) | 1992-06-19 |
CA2069511A1 (fr) | 1991-06-23 |
FI94363C (fi) | 1995-08-25 |
DE69008190D1 (de) | 1994-05-19 |
NO179456B (no) | 1996-07-01 |
FI94363B (fi) | 1995-05-15 |
KR920703852A (ko) | 1992-12-18 |
BR9007935A (pt) | 1992-11-24 |
US5342700A (en) | 1994-08-30 |
ES2051116T3 (es) | 1994-06-01 |
FR2656242A1 (fr) | 1991-06-28 |
NO922419D0 (no) | 1992-06-19 |
DE69008190T2 (de) | 1994-07-28 |
EP0506768B1 (fr) | 1994-04-13 |
OA09592A (fr) | 1993-04-30 |
WO1991009933A1 (fr) | 1991-07-11 |
KR100223730B1 (en) | 1999-10-15 |
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