EP0474530A1 - Verfahren zum Herstellen von hoch bruchfesten Produkten aus instabilem austenitischem Stahl und so hergestellte Produkte - Google Patents
Verfahren zum Herstellen von hoch bruchfesten Produkten aus instabilem austenitischem Stahl und so hergestellte Produkte Download PDFInfo
- Publication number
- EP0474530A1 EP0474530A1 EP91402232A EP91402232A EP0474530A1 EP 0474530 A1 EP0474530 A1 EP 0474530A1 EP 91402232 A EP91402232 A EP 91402232A EP 91402232 A EP91402232 A EP 91402232A EP 0474530 A1 EP0474530 A1 EP 0474530A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steel
- deformation
- temperature
- martensite
- composition
- 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
- 0 CC(*)C(*)C(*)C(C(*)C(*)C(*)**C(*)O*)N Chemical compound CC(*)C(*)C(*)C(C(*)C(*)C(*)**C(*)O*)N 0.000 description 2
Images
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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- 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
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
Definitions
- the present invention relates to a process for producing products with a very high breaking load from an unstable austenitic steel, and the product obtained by this process, in particular in the form of a wire or strip.
- This process is of the type in which the steel is subjected to a first plastic deformation at a temperature higher than the limit temperature (Md) for the formation of martensite by deformation and lower than the recrystallization temperature and then a second deformation of said steel to a temperature lower than said temperature (Md).
- hot rolled steel prior to the first deformation, is subjected to a standard annealing heat treatment called hyper-tempering consisting in placing said steel under a temperature between 1000 and 1100 ° C for about 30 minutes.
- the object of the invention is to control the formation of martensite so as to obtain products with particularly high tensile characteristics.
- the steel is subjected to plastic deformation at a temperature above the limit temperature (Md) for forming martensite by deformation and below the recrystallization temperature.
- Md limit temperature
- the breaking load of the steel is greater than 1000 MPa, preferably greater than 1300 MPa.
- the steel is deformed at a temperature below (Md), in a determined range of martensite formation temperature so that for an additional rational deformation of 0.1, the increase in the rate of martensite formed does not exceed 20% at any time.
- the steel is deformed at a temperature below (Md) with a cumulative rational deformation of between 0.7 and 3, which corresponds to a section reduction rate included between 50 and 95%.
- a minimum cumulative rational deformation of 0.7 is necessary to reach or slightly exceed the breaking loads envisaged in the drawing processes of the prior art.
- the steel is subjected to an aging treatment.
- a rational deformation greater than 1.65 corresponding to a reduction rate of section greater than 80% introduces into the steel a quantity of crystallographic defects sufficient in the form of dislocations to promote accommodation, that is to say the development of martensite platelets under the effect of cold deformation.
- the reduction rate can be much higher than this minimum rate.
- the products with very high breaking load according to the invention in particular in the form of wire or strip, are obtained by a plasticity effect induced by deformation.
- Aging of steels subjected to warm work hardening, followed by cold work hardening according to the process can increase the breaking load by around 200 MPa and sometimes more depending on the grade of steel used.
- the conditions for obtaining high tensile strengths are attached on the one hand to the mechanical characteristics obtained during lukewarm hardening, the steel having to have at least one tensile strength greater than 1000 MPa and on the other hand to the conditions of cold work hardening, according to which the work hardening of the steel is carried out in a determined range of temperature, called critical field of temperature of deformation of martensite, so that for an additional rational formation of 0.1, the increase in the rate of martensite formed does not exceed, at any time, 20%.
- rational deformation is meant the logarithm of the ratio of the surface S of the section after deformation on the surface So of the initial section (In S / So).
- the determined range of martensite formation temperature is, for the steels taken as an example, included in the range -20 ° C. + 180 ° C. Indeed, beyond + 180 ° C there is no longer an appreciable amount of martensite, while below -20 ° C the formation of martensite is excessive.
- the basic thread used in these three examples is a wire rod about 5.6mm in diameter; the wire is cold-worked at 250 ° C in several passes up to a diameter of approximately 2mm, then this wire is cold drawn at room temperature of 20 ° C in order to obtain a wire of approximately 0.5mm in diameter, the section reduction rates per drawing pass being approximately 25%. After each drawing pass the wire returns to room temperature before another pass.
- the number of lukewarm passes is approximately 20, the number of cold passes being approximately 10.
- the steel used for the implementation of the process is a steel referenced 1, having the following weight composition: 0.08% carbon, 18.6% chromium, 8.5% nickel, 0.3% manganese , 0.5% silicon, 0.04% nitrogen.
- Curve 1A represents, for the steel referenced 1, the evolution of the rate of martensite as a function of the rational deformation, this rate of martensite reaching approximately 60% after cold drawing.
- Curve 1B represents the evolution of the load at break during lukewarm hardening up to 1400 MPa then the evolution of the load at break during cold drawing thus reaching 2500 MPa; aging provides a breaking load of approximately 2700 Mpa.
- the increase in breaking load is obtained by controlling the increase in the formation of martensite from one wire drawing pass to another.
- the steel used is a steel referenced 2, having the following composition by weight: 0.09% carbon, 17.3% chromium, 8.3% nickel, 0.9% manganese, 0.8% silicon , 0.06% nitrogen.
- Curve 2A illustrates for the steel referenced 2 the evolution of the rate of martensite as a function of the cumulative rational deformation, the rate of martensite reached being approximately 45%.
- Curve 2B represents the evolution of the breaking load during lukewarm hardening, up to a breaking load of 1600 MPa, then the evolution of said breaking load during cold drawing, reaching about 2500 MPa.
- the steel used is a steel referenced 3 and having the following composition: 0.09% carbon, 17.3% chromium, 7.7% nickel, 0.5% manganese, 0.8% silicon, 0.15% nitrogen, 1% aluminum.
- the curve 3A represents for the steel referenced 3 the evolution of the rate of martensite as a function of the rational deformation, the rate of martensite being able to reach 95%.
- Curve 3B represents the evolution of the load at break during lukewarm hardening, up to the load at rupture of approximately 1600 MPa, then the evolution of said load at break during cold drawing, reaching around 2300 Mpa.
- the gain after heat treatment at 480 ° C. for 45 minutes is in this example approximately 300 MPa.
- Such characteristics are obtained by the formation of martensite during cold drawing, slower formation on a product previously cold-worked at lukewarm than by direct cold drawing of the wire rod.
- the first "lukewarm" deformation or work hardening operation may be a wire drawing, as described in the examples, but also a rolling, hammering or forging, twisting, alternating bending, or the like.
- the second cold deformation operation can also take various aspects: drawing, rolling or other.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Steel (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9010828 | 1990-08-30 | ||
FR9010828A FR2666352B1 (fr) | 1990-08-30 | 1990-08-30 | Procede d'elaboration de produits a tres haute charge a la rupture a partir d'un acier austhenitique instable, et produits en resultant. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0474530A1 true EP0474530A1 (de) | 1992-03-11 |
EP0474530B1 EP0474530B1 (de) | 1995-12-13 |
Family
ID=9399967
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91402232A Expired - Lifetime EP0474530B1 (de) | 1990-08-30 | 1991-08-12 | Verfahren zum Herstellen von hoch bruchfesten Produkten aus instabilem austenitischem Stahl und so hergestellte Produkte |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0474530B1 (de) |
JP (1) | JPH0681033A (de) |
AT (1) | ATE131539T1 (de) |
CA (1) | CA2050208C (de) |
DE (1) | DE69115392T2 (de) |
ES (1) | ES2083543T3 (de) |
FR (1) | FR2666352B1 (de) |
GR (1) | GR3019185T3 (de) |
PT (1) | PT98792B (de) |
TW (1) | TW226033B (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0953651A1 (de) * | 1998-04-29 | 1999-11-03 | Ugine-Savoie Imphy | Rostfreier Stahl zur Herstellung von gezogenem Draht, insbesondere zur Verstärkung von Reifen, und so hergestellter Draht |
EP4198363A1 (de) * | 2021-12-14 | 2023-06-21 | Vallourec Tube-Alloy, LLC | Hochfestes isoliertes rohr |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62275035A (ja) * | 1985-05-07 | 1987-11-30 | Sumitomo Electric Ind Ltd | 光フアイバ用母材の製造方法 |
JP3542239B2 (ja) * | 1996-10-15 | 2004-07-14 | 新日本製鐵株式会社 | 耐伸線縦割れ性に優れた高強度ステンレス線材及びその鋼線 |
JP4519513B2 (ja) * | 2004-03-08 | 2010-08-04 | 新日鐵住金ステンレス株式会社 | 剛性率に優れた高強度ステンレス鋼線およびその製造方法 |
DE102004051885A1 (de) * | 2004-10-26 | 2006-04-27 | Fag Kugelfischer Ag & Co. Ohg | Mechanisch belastbares Stell- oder Lagerbauteil aus mechanisch gehärtetem Stahl |
WO2010052751A1 (en) * | 2008-11-05 | 2010-05-14 | Honda Motor Co., Ltd. | High-strength steel sheet and the method for production therefor |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3296846A (en) * | 1964-06-05 | 1967-01-10 | Crucible Steel Co America | Method of rolling steel |
FR1550475A (de) * | 1966-11-22 | 1968-12-20 | ||
FR2207992A1 (de) * | 1972-11-29 | 1974-06-21 | Brunswick Corp | |
US4265679A (en) * | 1979-08-23 | 1981-05-05 | Kawasaki Steel Corporation | Process for producing stainless steels for spring having a high strength and an excellent fatigue resistance |
US4415377A (en) * | 1982-06-28 | 1983-11-15 | Olin Corporation | Duplex rolling process and apparatus |
-
1990
- 1990-08-30 FR FR9010828A patent/FR2666352B1/fr not_active Expired - Lifetime
-
1991
- 1991-08-12 AT AT91402232T patent/ATE131539T1/de not_active IP Right Cessation
- 1991-08-12 EP EP91402232A patent/EP0474530B1/de not_active Expired - Lifetime
- 1991-08-12 ES ES91402232T patent/ES2083543T3/es not_active Expired - Lifetime
- 1991-08-12 DE DE69115392T patent/DE69115392T2/de not_active Expired - Lifetime
- 1991-08-28 PT PT98792A patent/PT98792B/pt not_active IP Right Cessation
- 1991-08-29 CA CA002050208A patent/CA2050208C/fr not_active Expired - Lifetime
- 1991-08-29 TW TW080106872A patent/TW226033B/zh active
- 1991-08-30 JP JP3220367A patent/JPH0681033A/ja active Pending
-
1996
- 1996-03-05 GR GR960400587T patent/GR3019185T3/el unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3296846A (en) * | 1964-06-05 | 1967-01-10 | Crucible Steel Co America | Method of rolling steel |
FR1550475A (de) * | 1966-11-22 | 1968-12-20 | ||
FR2207992A1 (de) * | 1972-11-29 | 1974-06-21 | Brunswick Corp | |
US4265679A (en) * | 1979-08-23 | 1981-05-05 | Kawasaki Steel Corporation | Process for producing stainless steels for spring having a high strength and an excellent fatigue resistance |
US4415377A (en) * | 1982-06-28 | 1983-11-15 | Olin Corporation | Duplex rolling process and apparatus |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0953651A1 (de) * | 1998-04-29 | 1999-11-03 | Ugine-Savoie Imphy | Rostfreier Stahl zur Herstellung von gezogenem Draht, insbesondere zur Verstärkung von Reifen, und so hergestellter Draht |
FR2778188A1 (fr) * | 1998-04-29 | 1999-11-05 | Ugine Savoie Sa | Acier inoxydable pour l'elaboration de fil trefile notamment de fil de renfort de pneumatique et procede de realisation dudit fil |
US6048416A (en) * | 1998-04-29 | 2000-04-11 | Ugine-Savoie Imphy | Steel, steel wire, and process for forming drawn wire of steel |
EP4198363A1 (de) * | 2021-12-14 | 2023-06-21 | Vallourec Tube-Alloy, LLC | Hochfestes isoliertes rohr |
WO2023110731A1 (en) * | 2021-12-14 | 2023-06-22 | Vallourec Tube Alloy, Llc | High strength insulated tube |
Also Published As
Publication number | Publication date |
---|---|
DE69115392T2 (de) | 1996-05-30 |
GR3019185T3 (en) | 1996-06-30 |
TW226033B (de) | 1994-07-01 |
PT98792A (pt) | 1992-07-31 |
FR2666352B1 (fr) | 1992-12-11 |
FR2666352A1 (fr) | 1992-03-06 |
JPH0681033A (ja) | 1994-03-22 |
EP0474530B1 (de) | 1995-12-13 |
CA2050208A1 (fr) | 1992-03-01 |
ATE131539T1 (de) | 1995-12-15 |
ES2083543T3 (es) | 1996-04-16 |
CA2050208C (fr) | 2002-08-20 |
PT98792B (pt) | 1999-01-29 |
DE69115392D1 (de) | 1996-01-25 |
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