EP1130127A1 - Acier inoxydable austenitique a haute usinabilite, resulfure, et comportant une resistance a la corrosion amelioree. - Google Patents

Acier inoxydable austenitique a haute usinabilite, resulfure, et comportant une resistance a la corrosion amelioree. Download PDF

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Publication number
EP1130127A1
EP1130127A1 EP01400533A EP01400533A EP1130127A1 EP 1130127 A1 EP1130127 A1 EP 1130127A1 EP 01400533 A EP01400533 A EP 01400533A EP 01400533 A EP01400533 A EP 01400533A EP 1130127 A1 EP1130127 A1 EP 1130127A1
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EP
European Patent Office
Prior art keywords
inclusions
steel
resulfurized
machinability
corrosion resistance
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.)
Withdrawn
Application number
EP01400533A
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German (de)
English (en)
French (fr)
Inventor
Jean Ragot
Jean-Michel Hauser
Christian Trombert
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ugine Savoie Imphy SA filed Critical Ugine Savoie Imphy SA
Publication of EP1130127A1 publication Critical patent/EP1130127A1/fr
Withdrawn legal-status Critical Current

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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
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur

Definitions

  • the present invention relates to a stainless steel with high machinability, resulfurized, and having improved corrosion resistance, used in particular in the field of machining at very high cutting speed and in the field of bar turning.
  • the aim sought is training, with manganese and in a lower proportion, with chromium, of a manganese sulfide and chromium (Mn, Cr) S which generates in the form of specific inclusions a solid lubrication of the cutting tool during machining operations.
  • Such a steel has good machinability properties in the field of conventional cutting speeds, i.e. less than 500 m / min in filming.
  • the steel has associated inclusions composed of type oxides lime silicoaluminate with inclusions of manganese sulfides. These inclusions are larger and more deformable than sulfide inclusions alone.
  • the resulfurized stainless steel with improved machinability which can be used in particular in the field of high-speed cutting machining and in the area of bar turning, is characterized by the following weight composition: carbon less than 0.1%; silicon less than 2%; manganese less than 2%; nickel from 7 to 12%; chromium, from 15 to 25%; sulfur, 0.10 to 0.55%; copper, from 1 to 5%; calcium greater than 35.10 -4 %; oxygen greater than 70.10 -4 %, the ratio of calcium content to oxygen content being between 0.2 and 0.6.
  • manganese sulfides are very little substituted in chromium due to a manganese content adapted to the sulfur content, and that their malleability, and therefore their efficiency during cutting, is improved.
  • the object of the present invention is to present a steel containing sulfur, to improve machinability, and with specific inclusions providing significant improvement in the field of corrosion resistance, especially in pitting corrosion.
  • the steel of the invention makes it possible to reconcile the level of machinability of the steels resulfurized while having a corrosion resistance similar to that of steels low sulfur.
  • Figure 1 presents an Fe-Cr-S diagram on which the preferential field of the invention.
  • FIG. 2 presents a Ca-Si-AI diagram on which the preferential field of the lime silicoaluminate inclusions of the invention.
  • Figures 3a, 3b, 3c and 4 show the curves respectively pitting and cavernous corrosion characteristics for steel C according to the invention in comparison with the reference steels A and B.
  • Parts made from long stainless steel products austenitics are, most often by machining.
  • these steels have the disadvantage to have a low thermal conductivity, hence poor evacuation of the heat at the tip of the tool, and high hardenability locally introducing high hardness zones resulting in rapid deterioration of the tool cutting during machining.
  • resulfurized steels in general, contain hard chromite inclusions (Cr, Mn, Al, Ti) O, alumina (AlMg) O, silicate (SiMn) O, which are abrasive for cutting tools.
  • the steels used will be low sulfur steels, i.e. steels containing in their composition less than 0.035% sulfur, the machinability of which can be improved in a limited way by around 20% by replacing hard inclusions, by example of chromite type, by malleable oxides of aluminosilicate type of lime. In any case, the level of machinability will remain far below that of a resulfurized grade of about minus 25%.
  • the use of resulfurized steels allows, thanks to the addition of a large amount of sulfur between 0.15% at 0.45%, to obtain a very large number of manganese sulphides containing a low chromium content, i.e. less than about 20%, which are introduced for facilitate chip splitting and increase the life of the cutting tools cutting, thereby allowing significant productivity gains during the production of parts.
  • the poor corrosion resistance of these steels is linked to the poor resistance to corrosion, especially by pitting, of these sulfides of manganese very little substituted in chromium. Again, the replacement of hard inclusions by malleable oxides improves machinability steels but without in any way modifying the resistance to corrosion which remains poor, in comparison with steels containing no sulfur.
  • the steel according to the invention relates to a stainless steel with high machinability, resulfurized, having improved corrosion resistance, characterized in that it includes in its composition inclusions of lime silicoaluminate of the type anorthite and / or pseudo-wollastonite and / orabilityite associated with inclusions of the compound CrMnS, the chromium content of which is between 30% and 70%.
  • the compound, containing chromium sulfides as inclusions complementary to the inclusions of lime silicoaluminate and ensuring a resistance to corrosion, is achieved by reducing the content of manganese in the composition of the steel during its production. Content manganese is chosen less than or equal to 0.5%.
  • the solution consists in obtaining, during the preparation, sulphides very rich in chromium, the chromium content being between 30% and 70% in composition weight. Thanks to these, the inventors have found that a resulfurized steel containing from 0.15% to 0.45% of sulfur has a corrosion resistance generalized, cavernous, by bites or salt spray which is similar to that of a non-resulfurized steel, that is to say containing less than 0.035% of sulfur.
  • these predominantly chromium sulfides and oxides malleable which are lime silico-aluminates of the anorthite and / or pseudo-wollastonite type and / ororite, allows to maintain a level of machinability of the point of view of chip splitting, cutting conditions and tool life, similar to that of conventional resulfurized steels whose sulfides are manganese sulfides containing a low chromium content, i.e. from 0 to About 20% chromium by weight composition.
  • aluminum is present as an additional element to obtain silico-aluminates lime of the anorthite and / or pseudo-wollastonite and / orabilityite type quantity since they are deformable and resistant to corrosion.
  • Copper limits the effort required to form the chip. Because of this property, the temperature at the tip of the tool remains at a bearable level for this one. Copper reduces hardening. This low hardenability leads obtaining less hard drawn bars, in particular at the surface. Because of these characteristics, copper contributes to improving the performance of steel according to the invention.
  • the steel according to the invention may also contain, in its weight composition, less than 30 10 -4 % of boron and from 0.01% to 0.3% of vanadium.
  • the resulfurized steel of the application example which can preferably be used in the field of bar turning but also in that of machining said to large cutting speeds, due to the presence of a large number of inclusions malleable sulphide rich in chromium and associated or unassociated oxide, and also due to the presence of a copper content according to the invention, ensures on the one hand, machining at exceptional cutting speeds and resistance to also exceptional pitting corrosion.
  • Figures 3a, 3b, and 3c show respectively the characteristic curves in pitting corrosion and in corrosion cavernous for steel C according to the invention in comparison with steels A and B reference.
  • Table 2 shows the performance of steels A, B and steel C in a first cutting condition with a cutting speed of 40 m / min and an advance of 0.1 mm / revolution.
  • Table 3 shows the performance of steels A, B and steel C in a second cutting condition with a cutting speed of 25 m / min and a feed rate of 0.25 mm / revolution.
  • the proposed solution makes it possible to reconcile the best possible machinability brought by sulfur and the associated inclusions of lime silicoaluminate, to high corrosion resistance similar to that of non-base steels resulfurized.
  • this steel allows users to get rid of the choice to make vis-à-vis of either property.
  • this steel allows users of steels not resulfurized for the production of corrosion resistant parts, to gain productivity therefore in part cost.
  • it also allows users of resulfurized steels, who then carry out a standard surface treatment chromium plating in order to improve the corrosion resistance of the parts, to overcome this treatment.

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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)
EP01400533A 2000-03-03 2001-03-01 Acier inoxydable austenitique a haute usinabilite, resulfure, et comportant une resistance a la corrosion amelioree. Withdrawn EP1130127A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0002718A FR2805829B1 (fr) 2000-03-03 2000-03-03 Acier inoxydable austenitique a haute usinabilite, resulfure, et comportant une resistance a la corrosion amelioree
FR0002718 2000-03-03

Publications (1)

Publication Number Publication Date
EP1130127A1 true EP1130127A1 (fr) 2001-09-05

Family

ID=8847667

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EP01400533A Withdrawn EP1130127A1 (fr) 2000-03-03 2001-03-01 Acier inoxydable austenitique a haute usinabilite, resulfure, et comportant une resistance a la corrosion amelioree.

Country Status (15)

Country Link
US (1) US6485680B2 (ko)
EP (1) EP1130127A1 (ko)
JP (1) JP2001288545A (ko)
KR (1) KR20010087264A (ko)
CA (1) CA2338156A1 (ko)
CZ (1) CZ2001799A3 (ko)
EG (1) EG22736A (ko)
FR (1) FR2805829B1 (ko)
IL (1) IL141638A (ko)
NO (1) NO20011010L (ko)
PL (1) PL346260A1 (ko)
RU (1) RU2250928C2 (ko)
SI (1) SI20534A (ko)
TW (1) TW524862B (ko)
UA (1) UA72739C2 (ko)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1314792A1 (fr) * 2001-11-26 2003-05-28 Usinor Acier inoxydable ferritique au soufre, utilisable pour des pieces ferromagnétiques

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7597987B2 (en) * 2002-08-20 2009-10-06 Daido Tokushuko Kabushiki Kaisha Metal component for fuel cell and method of manufacturing the same, austenitic stainless steel for polymer electrolyte fuel cell and metal component for fuel cell material and method of manufacturing the same, corrosion-resistant conductive component and method of manufacturing the same, and fuel cell
US20090081077A1 (en) * 2006-12-28 2009-03-26 Kinji Sawada Alkaline water sterilizer and alkaline sterilizing water production method
US20110176914A1 (en) * 2008-09-25 2011-07-21 Borgwarner Inc. Turbocharger and blade bearing ring therefor
ES2455222T5 (es) * 2010-07-02 2018-03-05 Thyssenkrupp Steel Europe Ag Acero de resistencia superior, conformable en frío y producto plano de acero compuesto de un acero de este tipo
UA111115C2 (uk) 2012-04-02 2016-03-25 Ейкей Стіл Пропертіс, Інк. Рентабельна феритна нержавіюча сталь
LU100834B1 (en) * 2018-06-12 2019-12-12 Variowell Dev Gmbh A padding having hollow volumes and a flexible band

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4219356A (en) * 1977-09-20 1980-08-26 Daido Tokushuko Kabushiki Kaisha Machinable ferritic stainless steels
EP0403332A1 (fr) * 1989-06-16 1990-12-19 Ugine Savoie Acier inoxydable austénitique resulfuré à usinabilité améliorée
JPH04371553A (ja) * 1991-06-21 1992-12-24 Daido Steel Co Ltd 快削ステンレス鋼
EP0685567A1 (fr) * 1994-05-31 1995-12-06 Ugine Savoie Acier inoxydable ferritique à usinabilité améliorée
EP0736610A1 (fr) * 1995-04-07 1996-10-09 UGINE SAVOIE (société anonyme) Acier inoxydable austénitique resulfuré à usinabilité améliorée, utilisé notamment dans le domaine de l'usinage à très grande vitesse de coupe et le domaine du décolletage
WO1999036584A1 (en) * 1998-01-16 1999-07-22 Crs Holdings, Inc. Free-machining martensitic stainless steel

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2690169B1 (fr) * 1992-04-17 1994-09-23 Ugine Savoie Sa Acier inoxydable austénitique à haute usinabilité et à déformation à froid améliorée.

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4219356A (en) * 1977-09-20 1980-08-26 Daido Tokushuko Kabushiki Kaisha Machinable ferritic stainless steels
EP0403332A1 (fr) * 1989-06-16 1990-12-19 Ugine Savoie Acier inoxydable austénitique resulfuré à usinabilité améliorée
JPH04371553A (ja) * 1991-06-21 1992-12-24 Daido Steel Co Ltd 快削ステンレス鋼
EP0685567A1 (fr) * 1994-05-31 1995-12-06 Ugine Savoie Acier inoxydable ferritique à usinabilité améliorée
EP0736610A1 (fr) * 1995-04-07 1996-10-09 UGINE SAVOIE (société anonyme) Acier inoxydable austénitique resulfuré à usinabilité améliorée, utilisé notamment dans le domaine de l'usinage à très grande vitesse de coupe et le domaine du décolletage
WO1999036584A1 (en) * 1998-01-16 1999-07-22 Crs Holdings, Inc. Free-machining martensitic stainless steel

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 247 (C - 1059) 18 May 1993 (1993-05-18) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1314792A1 (fr) * 2001-11-26 2003-05-28 Usinor Acier inoxydable ferritique au soufre, utilisable pour des pieces ferromagnétiques
FR2832734A1 (fr) * 2001-11-26 2003-05-30 Usinor Acier inoxydable ferritique au soufre, utilisable pour des pieces ferromagnetiques
US6921511B2 (en) 2001-11-26 2005-07-26 Ugitech Sulphur-containing ferritic stainless steel that can be used for ferromagnetic parts

Also Published As

Publication number Publication date
CA2338156A1 (fr) 2001-09-03
JP2001288545A (ja) 2001-10-19
IL141638A (en) 2004-07-25
CZ2001799A3 (cs) 2002-02-13
EG22736A (en) 2003-07-30
IL141638A0 (en) 2002-03-10
UA72739C2 (en) 2005-04-15
SI20534A (sl) 2001-10-31
FR2805829B1 (fr) 2002-07-19
NO20011010L (no) 2001-09-04
RU2250928C2 (ru) 2005-04-27
PL346260A1 (en) 2001-09-10
US6485680B2 (en) 2002-11-26
US20010046449A1 (en) 2001-11-29
NO20011010D0 (no) 2001-02-27
KR20010087264A (ko) 2001-09-15
FR2805829A1 (fr) 2001-09-07
TW524862B (en) 2003-03-21

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