EP0736610B1 - 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 - Google Patents

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 Download PDF

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Publication number
EP0736610B1
EP0736610B1 EP96400532A EP96400532A EP0736610B1 EP 0736610 B1 EP0736610 B1 EP 0736610B1 EP 96400532 A EP96400532 A EP 96400532A EP 96400532 A EP96400532 A EP 96400532A EP 0736610 B1 EP0736610 B1 EP 0736610B1
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EP
European Patent Office
Prior art keywords
steel
resulfurized
calcium
austenitic stainless
field
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
EP96400532A
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German (de)
English (en)
French (fr)
Other versions
EP0736610A1 (fr
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 Imphy SA
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Publication of EP0736610A1 publication Critical patent/EP0736610A1/fr
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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 an austenitic stainless steel resulfurized with improved machinability, used in particular in the field machining at very high cutting speed and the field of bar turning.
  • 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.
  • the aim sought is training, with the manganese and in a lower proportion, with chromium, of a manganese and chromium sulfide (Mn, Cr) S which generates under the form of specific inclusions solid lubrication of the tool cutting during machining operations.
  • Mn, Cr manganese and chromium sulfide
  • sulfur has an unfavorable effect on corrosion resistance and that, despite this, an orientation chosen is the introduction, in a resulfurized steel, of inclusions of lime silicoaluminate oxides most often associated with sulfide inclusions.
  • Such an austenitic steel has good machinability properties in the field of conventional cutting speeds, i.e. less than 500 m / min while shooting.
  • Steel has inclusions associated composed of oxides of the silicoaluminate type which coat preferably sulfide inclusions. These inclusions are more large and more deformable than the sulphide inclusions alone. The effect of the so-called solid lubrication of the cutting tool is thereby improved.
  • the steel described in the cited document has a disadvantage. Indeed, sulfur significantly reduces the properties of steel from the point of view of cold deformation with appearance of tapures for example in stretching or drawing.
  • the object of the invention is to propose a steel with machinability improved which can be used, on the one hand in the field of very high speed machining, with cutting speeds in turning which can exceed 700 m / min, and, on the other hand in the bar turning area with productivity greater than 30% at those obtained with a resulfurized austenitic stainless steel ordinary.
  • the subject of the invention is an austenitic stainless steel resulfurized with improved machinability usable in particular in the field high-speed cutting machining and bar turning, such as as defined in claim 1.
  • Figure 1 shows the wear curves in steel clearance resulfurized stainless steels, either copper-free or without inclusion aluminosilicate of lime and of a resulfurized steel according to the invention, these steels being machined at very high cutting speed.
  • Figure 2 presents the hardening curves of a steel resulfurized without copper and 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 whose content in sulfur and the calcium and oxygen contents in a ratio determined ensure said steels good machinability at speeds cutting less than 500 m / min.
  • manganese sulfides are very little substituted for chromium because a manganese content adapted to the sulfur content, their malleability and therefore their effectiveness when cutting improved. 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 at low point fusion of sulfide and associated or unassociated oxide, and by the presence of a copper content according to the invention, ensures on the one hand, machining at exceptional cutting speeds and secondly, conservation of the life of the cutting tool.
  • the test consists of a turning operation, without lubrication, with an advance of 0.25 mm / revolution, a depth of 1.5 mm pass and a cutting speed of 700 m / min.
  • the tool is regularly dismantled 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 and tear is greater than 0.15 mm, or their edge is collapsed. It is therefore not thinkable of using, for the machining of these steels, such speeds of chopped off.
  • steel C according to the invention the coated tool is still in working condition after 20 minutes of turning, which allows, with conventional carbide coated tools to work industrially at such cutting speeds. This is due to the combined presence, in the composition of steel, of a large quantity of sulfur, malleable oxides with low melting point and a optimal copper content.
  • 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.
  • 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 bar turning 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.
  • Productivity Steel D Steel E 1.82 pieces / min 3,200 8,000 2.30 piece / min 1,500 3,200

Landscapes

  • 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)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Lubricants (AREA)
  • Gas Burners (AREA)
  • Heat Treatment Of Articles (AREA)
  • Turning (AREA)
EP96400532A 1995-04-07 1996-03-15 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 Expired - Lifetime EP0736610B1 (fr)

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 EP0736610A1 (fr) 1996-10-09
EP0736610B1 true EP0736610B1 (fr) 2001-02-21

Family

ID=9477855

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96400532A Expired - Lifetime EP0736610B1 (fr) 1995-04-07 1996-03-15 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

Country Status (22)

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

Families Citing this family (5)

* 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
FR2805829B1 (fr) * 2000-03-03 2002-07-19 Ugine Savoie Imphy Acier inoxydable austenitique a haute usinabilite, resulfure, et comportant une resistance a la corrosion amelioree
CA2784760C (en) 2010-06-09 2015-02-03 Sumitomo Metal Industries, Ltd. Austenitic stainless steel pipe excellent in steam oxidation resistance and manufacturing method therefor
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

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE346813B (no) * 1970-11-12 1972-07-17 Sandvikens Jernverks Ab
US4784828A (en) * 1986-08-21 1988-11-15 Crucible Materials Corporation Low carbon plus nitrogen, free-machining austenitic stainless steel
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
FR2648477B1 (fr) * 1989-06-16 1993-04-30 Ugine Savoie Sa Acier inoxydable austenitique resulfure a usinabilite amelioree
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
FR2690169B1 (fr) * 1992-04-17 1994-09-23 Ugine Savoie Sa Acier inoxydable austénitique à haute usinabilité et à déformation à froid améliorée.
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

Also Published As

Publication number Publication date
PL313658A1 (en) 1996-10-14
RU2106426C1 (ru) 1998-03-10
DE69611801D1 (de) 2001-03-29
JPH09137254A (ja) 1997-05-27
ATE199267T1 (de) 2001-03-15
CZ100096A3 (en) 1996-10-16
DE69611801T2 (de) 2001-09-06
RO115971B1 (ro) 2000-08-30
CA2173573A1 (fr) 1996-10-08
TR199600293A2 (tr) 1996-10-21
PL184056B1 (pl) 2002-08-30
US5656237A (en) 1997-08-12
SI9600115B (en) 2001-12-31
KR960037854A (ko) 1996-11-19
KR100389601B1 (ko) 2003-10-22
EP0736610A1 (fr) 1996-10-09
TW367373B (en) 1999-08-21
NO312682B1 (no) 2002-06-17
NO961353D0 (no) 1996-04-02
JP3687931B2 (ja) 2005-08-24
ES2154795T3 (es) 2001-04-16
NO961353L (no) 1996-10-08
FR2732694B1 (fr) 1997-04-30
UA39895C2 (uk) 2001-07-16
SI9600115A (en) 1996-10-31
IL117765A0 (en) 1996-08-04
IL117765A (en) 1998-12-06
PT736610E (pt) 2001-07-31
GR3035595T3 (en) 2001-06-29
CA2173573C (fr) 1999-12-28
FR2732694A1 (fr) 1996-10-11
CZ292424B6 (cs) 2003-09-17
DK0736610T3 (da) 2001-06-18

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