EP0931844A1 - Acier maraging sans cobalt - Google Patents
Acier maraging sans cobalt Download PDFInfo
- Publication number
- EP0931844A1 EP0931844A1 EP98403247A EP98403247A EP0931844A1 EP 0931844 A1 EP0931844 A1 EP 0931844A1 EP 98403247 A EP98403247 A EP 98403247A EP 98403247 A EP98403247 A EP 98403247A EP 0931844 A1 EP0931844 A1 EP 0931844A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cobalt
- maraging steel
- work hardening
- free
- steel according
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
Definitions
- the present invention relates to a cobalt-free maraging steel having a high yield strength and good ductility in the aged state after work hardening cold.
- Maraging steels are self-hardening steels likely to acquire by air cooling a soft martensitic structure which can be considerably hardened by an aging heat treatment causing formation of intermetallic precipitates.
- these steels contain 10% to 30% of nickel intended to allow a martensitic structure to be obtained by air cooling, low carbon to get martensite soft and additives intended to allow hardening by formation of intermetallic precipitates.
- Additions intended to obtain precipitation hardening include titanium, aluminum and molybdenum whose effects are significantly enhanced by the presence of cobalt. We can also add niobium to fix the carbon and thus soften the non-old martensitic structure
- the object of the present invention is to provide a maraging steel having the properties listed above, especially when used as thin cold rolled strips.
- This steel has a yield strength Re greater than or equal to 1900 MPa and a elongation greater than or equal to 6.5% in the aged state after cold work hardening, the work hardening rate being between 0% and 50%, and preferably between 10% and 45%.
- Maraging steel contains from 18% to 23%, and preferably more than 19% nickel, on the other hand from 4.5% to 8%, and preferably more than 5%, from molybdenum, the sum of the nickel and molybdenum contents being between 23% and 27%, and preferably between 24% and 26%, so as to have a martensitic transformation start temperature which is neither too high nor too high low, and to obtain a sufficient hardening effect of the molybdenum.
- the steel also contains from 1% to 2%, and preferably less than 1.6% of titanium, as well as 0% to 0.3% aluminum, in order to obtain a hardening effect by precipitation while limiting the risk of defect during hot rolling.
- the carbon content is limited to a maximum of 0.01% to obtain a Martensite sufficiently soft before aging.
- the rest of the composition is consisting of iron and impurities resulting from the production.
- This steel is produced, then poured and hot rolled in accordance with the state of art. In addition, it can be cold rolled, for example to obtain a strip of less than 1.5 mm thick.
- cold rolling can be performed in several stages separated by annealing at a temperature greater than or equal to 800 ° C.
- the last cold rolling step corresponds to a work hardening rate of between 0% and 50%, and preferably between 10% and 45%, and better still, less than 35%. In this case, after aging between 450 ° C and 510 ° C, the elastic limit Re obtained is higher at 1900 MPa and the elongation at break A% is greater than 6.5%.
- castings 1 to 7 were produced in accordance with the invention, and by way of comparison, casting A in accordance with the prior art.
- these flows we have fabricated cold rolled strips with variable work hardening rates during the last cold rolling step, which is preceded by annealing parade at 1020 ° C. These strips were then hardened by aging at 480 ° C. for 4 hours, then the mechanical characteristics were measured by a test of traction.
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 Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Description
- 23 ≤ Ni + Mo ≤ 27 %
- Ni + 3 x Mo + 20 x Ti + 10 x Al ≥ 60 %
échantillon | Ni | Mo | Ti | Al | C | Fe |
1 | 19,66 | 4,84 | 1,34 | 0,14 | 0,0021 | bal. |
2 | 19,30 | 5,07 | 1,42 | 0,1 | 0,0015 | bal. |
3 | 19,86 | 4,62 | 1,29 | 0,11 | <0,001 | bal. |
4 | 20,28 | 5,06 | 1,24 | 0,11 | <0,001 | bal. |
5 | 20,81 | 4,61 | 1,28 | 0,12 | <0,001 | bal. |
6 | 18,86 | 6,58 | 1,23 | 0,13 | 0,0087 | bal. |
7 | 19,84 | 6,55 | 1,23 | 0,13 | 0,0015 | bal. |
A comparaison | 18,13 | 2,92 | 1,36 | 0,14 | 0,0031 | bal. |
écrouissage % | 0 % | 25 % | 50 % | 75 % |
Re (MPa) | 1859,5 | 1934,5 | 2001,5 | 2138,5 |
A % | 7,13 | 7,67 % | 7 % | 3,54 % |
écrouissage % | 0 % | 7,4 % | 24,1 % | 45,9 % | 72,9 % |
Re (MPa) | 1946 | 1979,1 % | 2029,5 | 2120,2 | 2268 |
A % | 6,88 % | 7,3 % | 7,07 % | 6,65 % | 2,87 % |
écrouissage % | 0 % | 5,4 % | 22,7 % | 48,2 % | 74,6 % |
Re (MPa) | 1887,4 | 1932,3 | 1912 | 1994,8 | 2127,5 |
A % | 7,65 % | 7,96 % | 7,47 % | 6,83 % | 2,57 % |
écrouissage % | 0 % | 3 % | 19,2 % | 44,6 % | 71,2 % |
Re (MPa) | 1840,6 | 1967,6 | 1967,6 | 2001,2 | 2198,2 % |
A % | 9,48 % | 10,08 % | 8,85 % | 8,24 % | 7,79 % |
écrouissage % | 0 % | 4 % | 22 % | 48,4 % | 74,5 % |
Re (MPa) | 1852,1 | 1908,8 | 1970,7 | 2032,5 % | 2197,2 % |
A % | 8,99 % | 8,17 % | 7,39 % | 5,59 % | 3,32 % |
écrouissage % | 0 % | 8 % | 25,2 % | 49,8 % | 74 % |
Re (MPa) | 1956,3 | 2043,6 | 2097 | 2216,1 | 2318,6 |
A % | 9,64 % | 9,02 % | 8,65 % | 7,93 % | 6,32 % |
écrouissage % | 0 % | 8,8 % | 23,5 % | 48,8 % | 74,3 % |
Re (MPa) | 1696,7 | 1836,5 | 2012,5 | 2151,1 | 2336,7 |
A % | 9,93 % | 8,37 % | 8,25 % | 7,05 % | 3,98 % |
écrouissage % | 0 % | 25 % | 50 % | 75 % |
Re (MPa) | 1724 | 1771 | 1861 | 1965,5 |
A % | 9,3 % | 8,94 % | 10,16 % | 6,1 % |
Claims (8)
- Acier maraging sans cobalt caractérisé en ce que sa composition chimique comprend, en poids :18 % ≤ Ni ≤ 23 %4,5 % ≤ Mo ≤ 8 %1 % ≤ Ti ≤ 2 %0 % ≤ Al ≤ 0,3 %C ≤ 0,01 %23 ≤ Ni + Mo ≤ 27 %Ni + 3 x Mo + 20 x Ti + 10 x Al ≥ 60 %
- Acier maraging sans cobalt selon la revendication 1 caractérisé en ce que :Mo ≥ 5 %
- Acier maraging sans cobalt selon la revendication 1 ou la revendication 2 caractérisé en ce que :Ni ≥ 19 %
- Acier maraging sans cobalt selon l'une quelconque des revendications 1 à 3 caractérisé en ce que :24 ≤ Ni + Mo ≤ 26 %
- Acier maraging sans cobalt selon l'une quelconque des revendications 1 à 4 caractérisé en ce que :Ti ≤ 1,6 %
- Acier maraging sans cobalt selon l'une quelconque des revendications 1 à 5 caractérisé en ce qu'il a une limite d'élasticité Re supérieure ou égale à 1900 MPa et un allongement supérieur ou égal à 6,5 % à l'état vieilli après écrouissage à froid, le taux d'écrouissage étant compris entre 0 % et 50 %.
- Acier maraging selon la revendication 6 caractérisé en ce que le taux d'écrouissage est comprise entre 10 % et 45 %.
- Acier maraging selon la revendication 7 caractérisé en ce que le taux d'écrouissage est inférieur à 35 %.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9800694 | 1998-01-23 | ||
FR9800694A FR2774099B1 (fr) | 1998-01-23 | 1998-01-23 | Acier maraging sans cobalt |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0931844A1 true EP0931844A1 (fr) | 1999-07-28 |
EP0931844B1 EP0931844B1 (fr) | 2002-05-22 |
Family
ID=9522066
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98403247A Expired - Lifetime EP0931844B1 (fr) | 1998-01-23 | 1998-12-22 | Acier maraging sans cobalt |
Country Status (6)
Country | Link |
---|---|
US (1) | US6080359A (fr) |
EP (1) | EP0931844B1 (fr) |
JP (1) | JPH11256278A (fr) |
DE (1) | DE69805495T2 (fr) |
ES (1) | ES2176934T3 (fr) |
FR (1) | FR2774099B1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002040722A1 (fr) * | 2000-11-17 | 2002-05-23 | Imphy Ugine Precision | Procede pour fabriquer une bande ou une piece decoupee dans une bande en acier maraging laminee a froid |
EP1243812A1 (fr) * | 2001-03-19 | 2002-09-25 | Van Doorne's Transmissie B.V. | Courroie à éléments poussants et matériau pour celle-ci |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE60033772T2 (de) | 1999-12-24 | 2007-10-31 | Hitachi Metals, Ltd. | Martensitaushärtender Stahl mit hoher Dauerfestigkeit und Band aus dem martensitaushärtenden Stahl |
BRPI0608623A2 (pt) * | 2005-08-30 | 2010-01-19 | Ati Properties Inc | composiÇÕes de aÇo, mÉtodos de sua formaÇço e artigos formados a partir delas |
US8444776B1 (en) | 2007-08-01 | 2013-05-21 | Ati Properties, Inc. | High hardness, high toughness iron-base alloys and methods for making same |
PL2183401T3 (pl) | 2007-08-01 | 2018-08-31 | Ati Properties Llc | Stopy o dużej twardości, o dużej wiązkości na bazie żelaza i sposób ich wytwarzania |
US9182196B2 (en) | 2011-01-07 | 2015-11-10 | Ati Properties, Inc. | Dual hardness steel article |
US9657363B2 (en) | 2011-06-15 | 2017-05-23 | Ati Properties Llc | Air hardenable shock-resistant steel alloys, methods of making the alloys, and articles including the alloys |
CN113751679B (zh) * | 2021-09-09 | 2022-10-28 | 中南大学 | 一种无钴马氏体时效钢冷轧薄带的制造方法 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1089690A (en) * | 1965-10-15 | 1967-11-01 | Int Nickel Ltd | Steel |
FR2127799A5 (fr) * | 1971-02-26 | 1972-10-13 | Hitachi Ltd | |
EP0051401A1 (fr) * | 1980-10-31 | 1982-05-12 | Inco Research & Development Center, Inc. | Acier martensitique durci par vieillissement, et ne contenant pas de cobalt |
US4710347A (en) * | 1985-10-12 | 1987-12-01 | Korea Advanced Institute Of Science And Technology | Maraging steel having high strength and high toughness |
EP0327042A1 (fr) * | 1988-02-01 | 1989-08-09 | Inco Alloys International, Inc. | Acier maraging |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6029446A (ja) * | 1983-07-28 | 1985-02-14 | Riken Seikou Kk | 精密プラスチツク金型部品用合金鋼 |
JPS60221555A (ja) * | 1984-04-06 | 1985-11-06 | Kobe Steel Ltd | 耐Al溶損性のすぐれた超高張力鋼 |
-
1998
- 1998-01-23 FR FR9800694A patent/FR2774099B1/fr not_active Expired - Fee Related
- 1998-12-22 ES ES98403247T patent/ES2176934T3/es not_active Expired - Lifetime
- 1998-12-22 DE DE69805495T patent/DE69805495T2/de not_active Expired - Fee Related
- 1998-12-22 EP EP98403247A patent/EP0931844B1/fr not_active Expired - Lifetime
-
1999
- 1999-01-13 US US09/229,566 patent/US6080359A/en not_active Expired - Fee Related
- 1999-01-25 JP JP11015824A patent/JPH11256278A/ja not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1089690A (en) * | 1965-10-15 | 1967-11-01 | Int Nickel Ltd | Steel |
FR2127799A5 (fr) * | 1971-02-26 | 1972-10-13 | Hitachi Ltd | |
GB1355475A (en) * | 1971-02-26 | 1974-06-05 | Hitachi Ltd | Age-hardened nickel martensitic steel |
EP0051401A1 (fr) * | 1980-10-31 | 1982-05-12 | Inco Research & Development Center, Inc. | Acier martensitique durci par vieillissement, et ne contenant pas de cobalt |
US4443254A (en) * | 1980-10-31 | 1984-04-17 | Inco Research & Development Center, Inc. | Cobalt free maraging steel |
US4710347A (en) * | 1985-10-12 | 1987-12-01 | Korea Advanced Institute Of Science And Technology | Maraging steel having high strength and high toughness |
EP0327042A1 (fr) * | 1988-02-01 | 1989-08-09 | Inco Alloys International, Inc. | Acier maraging |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002040722A1 (fr) * | 2000-11-17 | 2002-05-23 | Imphy Ugine Precision | Procede pour fabriquer une bande ou une piece decoupee dans une bande en acier maraging laminee a froid |
FR2816959A1 (fr) * | 2000-11-17 | 2002-05-24 | Imphy Ugine Precision | Procede pour fabriquer une bande ou une piece decoupee dans une bande en acier maraging laminee a froid |
US6663730B2 (en) | 2000-11-17 | 2003-12-16 | Imphy Ugine Precision | Maraging steel and process for manufacturing a strip or a part cut out of a strip of cold-rolled maraging steel |
EP1243812A1 (fr) * | 2001-03-19 | 2002-09-25 | Van Doorne's Transmissie B.V. | Courroie à éléments poussants et matériau pour celle-ci |
US6869376B2 (en) | 2001-03-19 | 2005-03-22 | Van Doorne's Transmissie B.V. | Metal push belt and material therefor |
Also Published As
Publication number | Publication date |
---|---|
JPH11256278A (ja) | 1999-09-21 |
US6080359A (en) | 2000-06-27 |
ES2176934T3 (es) | 2002-12-01 |
EP0931844B1 (fr) | 2002-05-22 |
DE69805495D1 (de) | 2002-06-27 |
DE69805495T2 (de) | 2002-11-28 |
FR2774099A1 (fr) | 1999-07-30 |
FR2774099B1 (fr) | 2000-02-25 |
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