EP0736610A1 - Heraufgeschwefelter rostfreier austenitischer Stahl mit erhöhter Bearbeitbarkeit, insbesondere zur Verwendung in maschinelle Bearbeitung mit hohe Schnittgeschwindigkeit und auf den Drehautomaten - Google Patents

Heraufgeschwefelter rostfreier austenitischer Stahl mit erhöhter Bearbeitbarkeit, insbesondere zur Verwendung in maschinelle Bearbeitung mit hohe Schnittgeschwindigkeit und auf den Drehautomaten Download PDF

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Publication number
EP0736610A1
EP0736610A1 EP96400532A EP96400532A EP0736610A1 EP 0736610 A1 EP0736610 A1 EP 0736610A1 EP 96400532 A EP96400532 A EP 96400532A EP 96400532 A EP96400532 A EP 96400532A EP 0736610 A1 EP0736610 A1 EP 0736610A1
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EP
European Patent Office
Prior art keywords
steel
calcium
content
resulfurized
copper
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
Application number
EP96400532A
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English (en)
French (fr)
Other versions
EP0736610B1 (de
Inventor
Pascal Terrien
Xavier Cholin
Pierre Pedarre
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 SA
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Publication date
Application filed by Ugine Savoie SA filed Critical Ugine Savoie SA
Publication of EP0736610A1 publication Critical patent/EP0736610A1/de
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Publication of EP0736610B1 publication Critical patent/EP0736610B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • 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

Definitions

  • the present invention relates to a resulfurized austenitic stainless steel with improved machinability, used in particular in the field of machining at very high cutting speed and in the area of bar turning.
  • high speed machining of austenitic stainless steels means the use of cutting speeds greater than 500 m / min.
  • the speeds which can be used on a steel are, for example, determined by turning tests with tools comprising coated carbide inserts, tests designated Vb 15 / 0.15 , which consist in determining the speed at which the wear in clearance is 0.15 mm after 15 minutes of machining. Beyond this speed, it is not conceivable to machine without risk, below industrial practice is possible.
  • European patent No. 403 332 discloses a resulfurized austenitic steel with improved machinability. This document describes a process in which it is proposed, to improve the machinability, to introduce into a steel having the following general composition: carbon less than 0.15%, silicon less than 2%, manganese less than 2%, molybdenum less than 3%, nickel between 7 and 12%, chromium between 15 and 25%, an amount of sulfur in a proportion between 0.1 and 0.4%, associated with calcium and oxygen in contents respectively greater than 30.10 -4 % and 70. 10 -4 %, the contents of calcium and oxygen satisfying the Ca / O relationship between 0.2 and 0.6.
  • the aim sought is the formation, with manganese and to a lesser extent, with chromium, of a manganese and chromium sulfide (Mn, Cr) S which generates in the form of specific inclusions a solid lubrication of the cutting tool during machining operations.
  • Mn, Cr manganese and chromium sulfide
  • the sulfur has an unfavorable effect on the resistance to corrosion and that, in spite of this, a chosen orientation is the introduction, in a resulfurized steel, of inclusions of lime silicoaluminate oxides most often associated with sulphide inclusions.
  • Such an austenitic steel has good machinability properties in the field of conventional cutting speeds, that is to say less than 500 m / min in turning.
  • the steel includes associated inclusions composed of oxides of the silicoaluminate type which preferentially coat sulfide inclusions. These inclusions are larger and more deformable than the sulfide inclusions alone. The effect of the so-called solid lubrication of the cutting tool is thereby improved.
  • the steel described in the cited document however has a drawback. In fact, sulfur considerably reduces the properties of steel from the point of view of cold deformation with the appearance of tapures, for example in drawing or drawing.
  • the object of the invention is to propose a steel with improved machinability which can be used, on the one hand in the field of machining at very high speed, with cutting cutting speeds which can exceed 700 m / min, and, d on the other hand in the field of bar turning with productivity greater than 30% than that obtained with an ordinary resulfurized austenitic stainless steel.
  • FIG. 1 presents the wear curves in clearance of resulfurized stainless steels, either without copper, or without inclusion of aluminosilicate of lime and of a resulfurized steel according to the invention, these steels being machined at very high cutting speed.
  • FIG. 2 shows the work hardening curves of a copper-free resulfurized steel and of a steel according to the invention.
  • the austenitic stainless steel according to the invention has the following composition by weight: 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, 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.
  • This steel is in the field of so-called resulfurized steels, the sulfur content of which and the calcium and oxygen contents in a determined ratio ensure that said steels have good machinability at cutting speeds of less than 500 m / min.
  • the machinability is improved by the joint action of a large number of inclusions, manganese sulfides and aluminosilicate oxides of lime resulting from the supply of calcium and oxygen and by the presence of copper. 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 the latter. Under these conditions, the numerous inclusions of manganese sulphide and hot aluminosilicate oxides fully ensure, in combination, their role as solid lubricant to delay wear of the tool.
  • the manganese sulphides are very little substituted for chromium because of a manganese content adapted to the sulfur content, their malleability and therefore their efficiency during cutting thereby being improved.
  • the sulfur can be partially replaced by selenium and / or tellurium.
  • the resulfurized steel according to the invention which can preferably be used in the field of machining known as high cutting speeds, by the presence of a large number of malleable inclusions with a low melting point of sulfide and associated oxide, or not associated, and by the presence of a copper content according to the invention, ensures on the one hand, machining at exceptional cutting speeds and on the other hand, a conservation of the life of the tool chopped off .
  • the test consists of a turning operation, without lubrication, with an advance of 0.25 mm / revolution, a depth of cut of 1.5 mm and a cutting speed of 700 m / min.
  • the tool is disassembled regularly for measurement of draft wear. The resulting curves are shown in Figure 1.
  • Reference steels A and B are unsuitable for this type of machining. After only a few minutes of turning, the tools machining these steels are destroyed, that is to say that either their wear in relief is greater than 0.15 mm, or their edge is collapsed. It is therefore unthinkable to use, for the machining of these steels, such cutting speeds.
  • steel C according to the invention the coated tool is still in a state of machining after 20 minutes of turning, which allows, with conventional coated carbide tools to work industrially at such cutting speeds. This is due to the combined presence, in the composition of the steel, of a large quantity of sulfur, of malleable oxides with low melting point and of an optimal content of copper.
  • the machinability is improved by the presence of copper during the manufacture of bars, then by the action of inclusions of manganese sulfide and aluminosilicate oxides of lime during machining.
  • the copper reduces the hardenability, as shown in FIG. 2 in which the reference steel B and the steel C according to the invention are again compared. This low hardenability leads to the production of less hard drawn bars, in particular on the surface.
  • the reference D steel is a resulfurized steel which does not contain calcium or oxygen in its composition. in suitable proportion, and the steel E, according to the invention, in this exemplary embodiment, comprises in its composition, 1.5% copper, 62.10 -4 % calcium and 134.10 -4 % oxygen.
  • compositions of the reference steel D, and of the steel E according to the invention are described in Table 1.
  • the test consists in the production, from a drawn bar with a diameter of 5 mm, of a piece 50 mm long comprising essentially turning, with variable depth of pass from 0.5 to 1.5 mm.
  • Table 2 presents the results of a free-cutting test on a single spindle cam lathe with solid carbide tools and whole oil lubrication. The values in table 2 represent the number of parts with good quality machining before changing the tools.

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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)
  • Polishing Bodies And Polishing Tools (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Lubricants (AREA)
  • Gas Burners (AREA)
  • Heat Treatment Of Articles (AREA)
  • Turning (AREA)
EP96400532A 1995-04-07 1996-03-15 Heraufgeschwefelter rostfreier austenitischer Stahl mit erhöhter Bearbeitbarkeit, insbesondere zur Verwendung in maschinelle Bearbeitung mit hohe Schnittgeschwindigkeit und auf den Drehautomaten Expired - Lifetime EP0736610B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9504140 1995-04-07
FR9504140A FR2732694B1 (fr) 1995-04-07 1995-04-07 Acier inoxydable austenitique resulfure a usinabilite amelioree, utilise notamment dans le domaine de l'usinage a tres grande vitesse de coupe et le domaine du decolletage

Publications (2)

Publication Number Publication Date
EP0736610A1 true EP0736610A1 (de) 1996-10-09
EP0736610B1 EP0736610B1 (de) 2001-02-21

Family

ID=9477855

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EP96400532A Expired - Lifetime EP0736610B1 (de) 1995-04-07 1996-03-15 Heraufgeschwefelter rostfreier austenitischer Stahl mit erhöhter Bearbeitbarkeit, insbesondere zur Verwendung in maschinelle Bearbeitung mit hohe Schnittgeschwindigkeit und auf den Drehautomaten

Country Status (22)

Country Link
US (1) US5656237A (de)
EP (1) EP0736610B1 (de)
JP (1) JP3687931B2 (de)
KR (1) KR100389601B1 (de)
AT (1) ATE199267T1 (de)
CA (1) CA2173573C (de)
CZ (1) CZ292424B6 (de)
DE (1) DE69611801T2 (de)
DK (1) DK0736610T3 (de)
ES (1) ES2154795T3 (de)
FR (1) FR2732694B1 (de)
GR (1) GR3035595T3 (de)
IL (1) IL117765A (de)
NO (1) NO312682B1 (de)
PL (1) PL184056B1 (de)
PT (1) PT736610E (de)
RO (1) RO115971B1 (de)
RU (1) RU2106426C1 (de)
SI (1) SI9600115B (de)
TR (1) TR199600293A2 (de)
TW (1) TW367373B (de)
UA (1) UA39895C2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000065120A1 (en) * 1999-04-26 2000-11-02 Crs Holdings, Inc. Free-machining austenitic stainless steel
EP1130127A1 (de) * 2000-03-03 2001-09-05 Ugine-Savoie Imphy Heraufgeschwefelter rostfreier austenitischer Stahl mit erhöhter Bearbeitbarkeit und Korrosionsfestigkeit

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101470109B1 (ko) 2010-06-09 2014-12-05 신닛테츠스미킨 카부시키카이샤 내수증기 산화성이 뛰어난 오스테나이트계 스테인리스 강관 및 그 제조 방법
JP5818541B2 (ja) * 2011-07-01 2015-11-18 新日鐵住金ステンレス株式会社 オーステナイト系ｓ含有快削ステンレス鋼
UA111115C2 (uk) 2012-04-02 2016-03-25 Ейкей Стіл Пропертіс, Інк. Рентабельна феритна нержавіюча сталь

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0257979A2 (de) * 1986-08-21 1988-03-02 Crucible Materials Corporation Austenitischer rostfreier Stahl mit guter Zerspanbarkeit und mit niedrigem Kohlenstoff plus Stickstoffgehalt
JPH01319652A (ja) * 1988-06-20 1989-12-25 Nippon Koshuha Kogyo Kk 熱間加工性の良好な快削ステンレス鋼
EP0403332A1 (de) * 1989-06-16 1990-12-19 Ugine Savoie Heraufgeschwefelter rostfreier austenitischer Stahl mit erhöhter Bearbeitbarkeit
JPH0441651A (ja) * 1990-06-05 1992-02-12 Daido Steel Co Ltd 被削性の優れた耐食オーステナイト系ステンレス鋼
JPH05339680A (ja) * 1992-06-08 1993-12-21 Daido Steel Co Ltd 耐食性を高めた快削オーステナイトステンレス鋼とその製造方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE346813B (de) * 1970-11-12 1972-07-17 Sandvikens Jernverks Ab
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 (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0257979A2 (de) * 1986-08-21 1988-03-02 Crucible Materials Corporation Austenitischer rostfreier Stahl mit guter Zerspanbarkeit und mit niedrigem Kohlenstoff plus Stickstoffgehalt
JPH01319652A (ja) * 1988-06-20 1989-12-25 Nippon Koshuha Kogyo Kk 熱間加工性の良好な快削ステンレス鋼
EP0403332A1 (de) * 1989-06-16 1990-12-19 Ugine Savoie Heraufgeschwefelter rostfreier austenitischer Stahl mit erhöhter Bearbeitbarkeit
JPH0441651A (ja) * 1990-06-05 1992-02-12 Daido Steel Co Ltd 被削性の優れた耐食オーステナイト系ステンレス鋼
JPH05339680A (ja) * 1992-06-08 1993-12-21 Daido Steel Co Ltd 耐食性を高めた快削オーステナイトステンレス鋼とその製造方法

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14, no. 123 (C - 698) 8 March 1990 (1990-03-08) *
PATENT ABSTRACTS OF JAPAN vol. 16, no. 219 (C - 943) 22 May 1992 (1992-05-22) *
PATENT ABSTRACTS OF JAPAN vol. 18, no. 185 (C - 1185) 30 March 1994 (1994-03-30) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000065120A1 (en) * 1999-04-26 2000-11-02 Crs Holdings, Inc. Free-machining austenitic stainless steel
EP1130127A1 (de) * 2000-03-03 2001-09-05 Ugine-Savoie Imphy Heraufgeschwefelter rostfreier austenitischer Stahl mit erhöhter Bearbeitbarkeit und Korrosionsfestigkeit
FR2805829A1 (fr) * 2000-03-03 2001-09-07 Ugine Savoie Imphy Acier inoxydable austenitique a haute usinabilite, resulfure, et comportant une resistance a la corrosion amelioree

Also Published As

Publication number Publication date
CZ100096A3 (en) 1996-10-16
FR2732694B1 (fr) 1997-04-30
IL117765A (en) 1998-12-06
NO961353L (no) 1996-10-08
UA39895C2 (uk) 2001-07-16
KR960037854A (ko) 1996-11-19
TW367373B (en) 1999-08-21
PL313658A1 (en) 1996-10-14
SI9600115A (en) 1996-10-31
KR100389601B1 (ko) 2003-10-22
CA2173573A1 (fr) 1996-10-08
RU2106426C1 (ru) 1998-03-10
DK0736610T3 (da) 2001-06-18
DE69611801D1 (de) 2001-03-29
RO115971B1 (ro) 2000-08-30
ES2154795T3 (es) 2001-04-16
ATE199267T1 (de) 2001-03-15
PL184056B1 (pl) 2002-08-30
US5656237A (en) 1997-08-12
PT736610E (pt) 2001-07-31
IL117765A0 (en) 1996-08-04
GR3035595T3 (en) 2001-06-29
JP3687931B2 (ja) 2005-08-24
TR199600293A2 (tr) 1996-10-21
SI9600115B (en) 2001-12-31
FR2732694A1 (fr) 1996-10-11
JPH09137254A (ja) 1997-05-27
NO961353D0 (no) 1996-04-02
DE69611801T2 (de) 2001-09-06
CA2173573C (fr) 1999-12-28
NO312682B1 (no) 2002-06-17
EP0736610B1 (de) 2001-02-21
CZ292424B6 (cs) 2003-09-17

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