EP0947591B1 - Acier inoxydable austénitique pour l'élaboration notamment de fil - Google Patents

Acier inoxydable austénitique pour l'élaboration notamment de fil Download PDF

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Publication number
EP0947591B1
EP0947591B1 EP99400602A EP99400602A EP0947591B1 EP 0947591 B1 EP0947591 B1 EP 0947591B1 EP 99400602 A EP99400602 A EP 99400602A EP 99400602 A EP99400602 A EP 99400602A EP 0947591 B1 EP0947591 B1 EP 0947591B1
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EP
European Patent Office
Prior art keywords
inclusions
composition
mgo
steel
cao
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.)
Expired - Lifetime
Application number
EP99400602A
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German (de)
English (en)
French (fr)
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EP0947591A1 (fr
Inventor
Etienne Havette
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ugitech SA
Original Assignee
Ugine Savoie Imphy SA
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    • 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
    • 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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • 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
    • Y10T428/12431—Foil or filament smaller than 6 mils

Definitions

  • the present invention relates to an austenitic stainless steel for the elaboration in particular of yarn, having an inclusive cleanliness suitable for use in the field of wire drawing diameter less than 0.3 mm and in the area of production of parts subject to fatigue.
  • stainless steels we mean iron alloys containing at least 10.5% chromium. Other elements enter into the composition of steels in order to modify their structure and properties.
  • Austenitic stainless steels have a composition determined. The austenitic structure is ensured after transformation, by a heat treatment of the hyper quenching type.
  • gamma-genes favor the appearance of austenite phase of metallographic structure of cubic type with faces centered.
  • these elements are carbon, nitrogen, manganese, copper, nickel.
  • stainless steels can, in the liquid state, contain in solution, due to the production process, oxygen and sulfur below 1000 ppm. During the cooling of the steel in liquid or solid state, the solubility of elements oxygen and sulfur decreases and the energy of formation of oxides or sulfides is reached.
  • Patent application FR 95 04 782 (EP-A-738783) is known which deals with a austenitic stainless steel for making wire which can be used in the field of wire drawing and in the field of production parts subject to fatigue.
  • the invention defined in claim 1 aims to produce a stainless steel austenitic with selected inclusiveness, steel can be used especially in the field of wire drawing in diameter less than 0.3 mm and in the area of production of parts subject to fatigue.
  • Figures 1 and 2 respectively present an image of a example of slightly distorted, thick inclusion and an image of an example of inclusions contained in a steel according to the invention.
  • Carbon, nitrogen, chromium, nickel, manganese, silicon are the usual elements for obtaining a steel austenitic stainless.
  • the manganese, chromium, sulfur contents in proportion are chosen to generate deformable sulfides of good composition determined.
  • composition intervals of the silicon and manganese elements ensure according to the invention, the presence of inclusions of silicate type, rich in SiO 2 and containing a non-negligible amount of MnO.
  • Molybdenum can be added to the composition of steel austenitic stainless steel to improve corrosion resistance, with maximum content of 3%.
  • Copper can also be added to the composition of steel according to the invention because it improves the cold deformation properties and therefore, stabilizes the austenite.
  • the copper content is limited to 4% to avoid difficulties in hot processing because the copper significantly lowers the upper temperature limit of reheating of steel before rolling.
  • the intervals in total oxygen, aluminum and calcium make it possible, according to the invention, to obtain inclusions of the manganese silicate type containing a non-zero fraction of Al 2 O 3 and CaO.
  • the aluminum and calcium contained in the steel composition ensure, in the inclusions sought, the presence of more than 1% of CaO and more than 5% of Al 2 O 3 .
  • the values of the total oxygen contents are according to the invention between 40 ppm and 120 ppm.
  • oxygen fixes the elements magnesium, calcium, aluminum and does not form the inclusion of oxides rich in SiO 2 and MnO.
  • the calcium content is less than 5.10 -4 % so that the desired inclusions do not contain more than 30% CaO.
  • the aluminum content is less than 5.10 -4 % to prevent the desired inclusions from containing more than 25% of Al 2 O 3 , which also promotes unwanted crystallization.
  • the invention relates to an austenitic stainless steel containing inclusions of chosen composition obtained voluntarily, the composition being related to the overall composition of the steel, so that the physical properties of these inclusions favor their deformation during hot transformation of steel.
  • austenitic stainless steel contains inclusions of determined composition which have their softening point close to the rolling temperature of the steel and such that the appearance of crystals harder than steel at the temperature of rolling as in particular the defined compounds, SiO 2 , in the form of tridymite, christobalite, quartz; 3CaO-SiO 2 ; CaO; MgO; Cr 2 O 3 ; anorthite, mullite, gehlenite, corundum, spinel of the Al 2 O 3 -MgO or Al 2 O 3 -Cr 2 O 3 -MnO-MgO type; CaO-Al 2 O 3 ; CaO-6Al 2 O 3 ; CaO-2Al 2 O 3 ; TiO 2 is inhibited.
  • the steel mainly contains inclusions of oxide of composition such as these form a vitreous mixture or amorphous during all the successive operations of setting in form of steel.
  • the viscosity of the inclusions chosen is sufficient to that the growth of crystallized oxide particles in the inclusions resulting from the invention is completely inhibited by the fact that, in an oxide inclusion, the short distance diffusion is weak and convective movements are very limited.
  • These inclusions remained glass in the temperature range of hot treatments of steel also have a higher hardness and modulus of elasticity weak than crystallized inclusions of corresponding composition.
  • inclusions can be further distorted, overwritten and elongated, during drawing operations for example, and the concentration of constraints in the vicinity of the inclusions is greatly reduced, this which significantly reduces the risk of, for example, fatigue cracks or wire drawing breaks.
  • austenitic stainless steel contains inclusions of oxides of defined composition such as their viscosity in the temperature range of hot rolling of steel is not too high. Therefore, the flow constraint of inclusion is significantly weaker than that of steel under the conditions of hot rolling whose temperatures are generally included between 800 ° C and 1350 ° C.
  • the oxide inclusions deform in same time as steel during hot rolling and therefore after rolling, these inclusions are perfectly elongated, and thick very small, i.e. less than 5 or 10 micrometers, which allows to avoid any problem of breakage during, for example, an operation of drawing.
  • SiO 2 content is less than 40%, the viscosity of the oxide inclusions is too low and the growth mechanism of oxide crystals is not inhibited. If SiO 2 is higher than 60%, very hard harmful particles of silica are formed in the form of trydimite or christobalite or quartz.
  • the MnO content between 5% and 50% makes it possible to greatly lower the softening point of the mixture of oxides containing in particular SiO 2 , CaO, Al 2 O 3 and promotes the creation of inclusions which remain in a glassy state under the rolling conditions of the steel according to the invention.
  • MgO content greater than 4%
  • crystals of MgO are formed; 2MgO-SiO 2 ; MgO-SiO 2 ; Al 2 O 3 -MgO, which are extremely hard phases.
  • Al 2 O 3 is less than 5%, wollastonite crystals are formed and when Al 2 O 3 is greater than 25%, crystals of mullite, anorthite, corundum and spinels appear, especially of the Al 2 type.
  • the sulfur content must be less than or equal to 50.10 -4 % in order to obtain sulphide inclusions of thickness not exceeding 5 ⁇ m on the rolled product.
  • inclusions of the manganese and chromium sulfide type are perfectly deformable under the conditions of the invention.
  • Oxide and sulfide inclusions are generally considered harmful with regard to the properties of use for the drawing in fine wire and for fatigue resistance, in particular in bending and / or in torsion. It is usual to characterize the concentration of oxide and sulfide inclusions by observing a polished section in the long direction of rolling on a hot rolled wire rod diameter between 5 and 10 mm. We call inclusive cleanliness the result of this characterization carried out according to different standards in depending on the end use.
  • a factor of shape which is the ratio of length to thickness.
  • the form factor is generally very high, i.e. up to 100 and more, therefore, the thickness of inclusion is extremely low.
  • an inclusion which is not does not deform or undergoes slight deformation is characterized by low form factor, i.e. of the order of 1, therefore, the thickness of the inclusion remains high and of the same order of magnitude than the size of the original inclusion on gross casting product.
  • Figures 1 and 2 show respectively on a polished section long direction of laminated wire of diameter 5.5 mm, an example of inclusions very thick and slightly deformed and an example of fine inclusions and very well deformed contained in the steel according to the invention.
  • Figure 1 shows an example of very thick and thin inclusions distorted highlighted on a laminated wire 5.5 mm in diameter.
  • Figure 2 shows an example of very well deformed inclusions highlighted on a laminated wire of 5.5 mm diameter
  • compositions do not do not reliably meet the acceptable specifications for the wire production and for parts subject to fatigue. According to selection of compositions, both for residual elements and for the composition of the inclusions after production of the steel it is defined the inclusive quality criteria.
  • Titanium, magnesium, sulfur, are present in quantities residual and may not be contained in the composition of steel and beyond, in the composition of inclusions.
  • Tables 1 and 2 below show steels showing the influence of the composition of the steel and of the composition of the oxide inclusions on the drawing ability and the fatigue strength.
  • the following basic composition known as the working composition, was chosen.
  • % C 0072 % N 0052 % If 0.771 % Mn 0.736 % Cr 18.522 % Ni 8,773 % Mo 0210 % Cu 0310 STEEL 1 2 2 3 4 5 6 Ot ppm 17 39 39 53 87 123 71 Al ppm 11 5 5 8 7 5 7 Ca ppm 4 7 7 6 8 1 2 Mg ppm 2 1 1 1 2 0.8 0.4 Ti ppm 4 8 8 7 45 2 38
  • S ppm 71 47 47 61 27 41 53 nature of inclusions % SiO2 25.6 25.2 29.1 18.6 47.4 9 % CaO 40.0 41.1 23.1 8.7 1.2 2.9 % MnO 0.7 2.5 7.4 8.8 32.3 6.7 % Al2O3 21.1 28.1 71 27
  • Table 1 presents compositions of steels considered of poor quality in the area of wire drawing and fatigue resistance.
  • Table 2 presents steel compositions according to the invention having an inclusive cleanliness generating a quality remarkable in both areas.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Heat Treatment Of Steel (AREA)
  • Metal Extraction Processes (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Materials For Medical Uses (AREA)
EP99400602A 1998-03-18 1999-03-12 Acier inoxydable austénitique pour l'élaboration notamment de fil Expired - Lifetime EP0947591B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9803263A FR2776306B1 (fr) 1998-03-18 1998-03-18 Acier inoxydable austenitique pour l'elaboration notamment de fil
FR9803263 1998-03-18

Publications (2)

Publication Number Publication Date
EP0947591A1 EP0947591A1 (fr) 1999-10-06
EP0947591B1 true EP0947591B1 (fr) 2004-02-04

Family

ID=9524146

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99400602A Expired - Lifetime EP0947591B1 (fr) 1998-03-18 1999-03-12 Acier inoxydable austénitique pour l'élaboration notamment de fil

Country Status (16)

Country Link
US (1) US6123784A (xx)
EP (1) EP0947591B1 (xx)
JP (1) JPH11315350A (xx)
KR (1) KR19990077924A (xx)
CN (1) CN1098372C (xx)
AT (1) ATE258999T1 (xx)
AU (1) AU737767B2 (xx)
BR (1) BR9903041A (xx)
CA (1) CA2266597A1 (xx)
DE (1) DE69914517T2 (xx)
ES (1) ES2212483T3 (xx)
FR (1) FR2776306B1 (xx)
HK (1) HK1026923A1 (xx)
ID (1) ID23217A (xx)
TW (1) TW476795B (xx)
ZA (1) ZA992060B (xx)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3504521B2 (ja) * 1998-12-15 2004-03-08 株式会社神戸製鋼所 疲労特性に優れたばね用鋼
FR2818289B1 (fr) * 2000-12-15 2003-08-08 Usinor Acier inoxydable pour une mise en forme severe et notamment l'emboutissage profond d'une tole
FR2818290A1 (fr) * 2000-12-15 2002-06-21 Ugine Savoie Imphy Acier inoxydable pour une mise en forme severe et notamment la frappe ou le trefilage d'un fil
JP2002206148A (ja) * 2001-01-09 2002-07-26 Nisshin Steel Co Ltd 加工割れ感受性が低いオーステナイト系ステンレス鋼板およびその製造方法
FR2827876B1 (fr) * 2001-07-27 2004-06-18 Usinor Acier inoxydable austenitique pour deformation a froid pouvant etre suivi d'un usinage
US20100119403A1 (en) * 2001-07-27 2010-05-13 Ugitech Austenitic Stainless Steel for Cold Working Suitable For Later Machining
KR20090066000A (ko) * 2007-12-18 2009-06-23 주식회사 포스코 고진공, 고순도 가스 배관용 오스테나이트계 스테인리스강
JP5853281B2 (ja) * 2011-03-25 2016-02-09 日新製鋼株式会社 表面光沢性に優れたオーステナイト系ステンレス鋼板
JP5278493B2 (ja) * 2011-05-27 2013-09-04 横浜ゴム株式会社 空気入りタイヤの製造方法
UA111115C2 (uk) 2012-04-02 2016-03-25 Ейкей Стіл Пропертіс, Інк. Рентабельна феритна нержавіюча сталь
CH708231B1 (fr) 2013-06-27 2017-03-15 Nivarox Far Sa Ressort d'horlogerie en acier inoxydable austénitique.
EP2924514B1 (fr) 2014-03-24 2017-09-13 Nivarox-FAR S.A. Ressort d'horlogerie en acier inoxydable austénitique
CN104907351B (zh) * 2015-04-22 2017-01-18 苏州劲元油压机械有限公司 一种滤油网用强韧不锈钢丝及其制造工艺
JP6491983B2 (ja) * 2015-08-28 2019-03-27 新日鐵住金ステンレス株式会社 高強度・高延性の極細線用ステンレス鋼線材、高強度・高延性の極細線用ステンレス鋼線
KR20220125343A (ko) * 2020-02-27 2022-09-14 닛테츠 스테인레스 가부시키가이샤 스테인레스강, 스테인레스 강재 및 스테인레스강의 제조 방법
CN113549820B (zh) * 2021-06-29 2022-05-17 鞍钢股份有限公司 一种高碳低铁素体含量奥氏体不锈钢板及其生产方法
CN114086074B (zh) * 2021-11-24 2022-11-25 马鞍山钢铁股份有限公司 一种海洋岛礁用高耐蚀性冷镦钢及其生产方法和热处理方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2456785A1 (fr) * 1979-05-17 1980-12-12 Daido Steel Co Ltd Acier de decolletage contenant des inclusions determinees et un procede de sa preparation
FR2690169B1 (fr) * 1992-04-17 1994-09-23 Ugine Savoie Sa Acier inoxydable austénitique à haute usinabilité et à déformation à froid améliorée.
US5314549A (en) * 1993-03-08 1994-05-24 Nkk Corporation High strength and high toughness stainless steel sheet and method for producing thereof
JPH0860308A (ja) * 1994-08-11 1996-03-05 Daido Steel Co Ltd 伸線性に優れたステンレス鋼材
FR2733252B1 (fr) * 1995-04-21 1997-05-23 Ugine Savoie Sa Acier inoxydable austenitique pour l'elaboration notamment de fil

Also Published As

Publication number Publication date
CN1098372C (zh) 2003-01-08
CN1238392A (zh) 1999-12-15
BR9903041A (pt) 2001-03-20
DE69914517T2 (de) 2004-12-23
AU737767B2 (en) 2001-08-30
ID23217A (id) 2000-03-30
CA2266597A1 (fr) 1999-09-18
ATE258999T1 (de) 2004-02-15
JPH11315350A (ja) 1999-11-16
TW476795B (en) 2002-02-21
AU2036799A (en) 1999-09-30
KR19990077924A (ko) 1999-10-25
US6123784A (en) 2000-09-26
ZA992060B (en) 1999-09-27
FR2776306B1 (fr) 2000-05-19
FR2776306A1 (fr) 1999-09-24
EP0947591A1 (fr) 1999-10-06
HK1026923A1 (en) 2000-12-29
ES2212483T3 (es) 2004-07-16
DE69914517D1 (de) 2004-03-11

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