EP0567365B1 - Acier inoxydable austénitique à haute usinabilité et à déformation à froid améliorée - Google Patents

Acier inoxydable austénitique à haute usinabilité et à déformation à froid améliorée Download PDF

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Publication number
EP0567365B1
EP0567365B1 EP93400903A EP93400903A EP0567365B1 EP 0567365 B1 EP0567365 B1 EP 0567365B1 EP 93400903 A EP93400903 A EP 93400903A EP 93400903 A EP93400903 A EP 93400903A EP 0567365 B1 EP0567365 B1 EP 0567365B1
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EP
European Patent Office
Prior art keywords
less
steel
austenitic stainless
stainless steel
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.)
Expired - Lifetime
Application number
EP93400903A
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German (de)
English (en)
French (fr)
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EP0567365A1 (fr
Inventor
Olivier Bletton
Xavier Cholin
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
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Ugine Savoie SA
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Publication of EP0567365A1 publication Critical patent/EP0567365A1/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
    • C22C38/18—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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N

Definitions

  • the present invention relates to a weldable austenitic stainless steel, with high machinability and having good cold deformation characteristics.
  • JP-A-160 785 discloses a machinable steel, cold deformable and having in its weight composition, in particular a sulfur content of less than 0.03%, calcium and oxygen contents of between 10 and 300 ppm and between 30 and 300 ppm, a copper content between 0.8 and 5% and a lead content between 0.01 and 0.25%.
  • the improvement in machinability is generated by the introduction into the composition of a variable amount of lead.
  • austenitic stainless steels are difficult to machine, on the one hand, because of their low thermal conductivity and, on the other hand, because of their high work hardening locally inducing zones of high hardness. Poor flow of the heat produced at the tip of a cutting tool leads to rapid deterioration of the tool.
  • This element has the disadvantages of being difficult to dissolve homogeneously in a molten bath and, because of its high density, of having a tendency to accumulate in the bottom of metallurgical vessels.
  • boron can be introduced into the composition of austenitic stainless steel according to JP-A-160 785, as an element capable of counteracting the harmful effects of lead in the field of hot rolling, but the boron increases still the welding difficulties.
  • the introduction of the boron element also brings at least one other drawback, that of reducing the temperature range suitable for hot rolling, which imposes a more restrictive hot rolling process.
  • Austenitic stainless steel according to JP-A-160 785 may also contain titanium.
  • titanium which is generally introduced into stainless steels in order to improve the resistance to intragranular corrosion, disrupts the formation of calcium oxide inclusions and reduces their number.
  • titanium leads to the formation of hard inclusions which reduce the workability by promoting premature wear of the cutting tools.
  • Also known from FR-A-2 542 761 is a process for manufacturing a steel with high machinability.
  • a cause of the difficulty of machining stainless steels lies in the fact that they contain inclusions of hard oxides such as for example alumina or chromite which deteriorate the tools of chopped off.
  • One way of reducing the harmfulness of hard oxide inclusions is to introduce one or more alkaline earth compounds into the steel, in order to replace a good proportion of hard inclusions with calcium-based oxide inclusions, for example. It is also specified, on the one hand, that a certain quantity of sulfur combined with hard inclusions reduces its harmfulness, the sulfur content generally being less than 0.5 ⁇ 10 -4 % and, on the other hand, that another way to reduce the harmfulness of inclusions is to reduce their quantity thanks to good deoxidation and good settling of the bath during the production of steel.
  • the aim sought is the formation, with manganese and in a smaller 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.
  • sulfur has an unfavorable effect on the resistance to corrosion and that despite this a chosen orientation is the introduction into a resulfurized steel of oxides of lime silicoaluminate and preferably of anorthite.
  • the present invention relates to a weldable austenitic stainless steel, with improved machinability and having good cold characteristics, in which the simultaneous presence in suitable proportion, of copper and of malleable oxides, chosen in a ternary diagram Al 2 O 3 , SiO 2 , CaO, very significantly improves a set of properties, some of which are contradictory.
  • the weldable austenitic stainless steel contains malleable oxides whose compositions are located in the ternary diagram AL 2 O 3 , SiO 2 and CaO, in the zone of the triple point anorthite, gehlenite, pseudo-wollastonite.
  • the sulfur ensures the formation of micro-precipitates of manganese sulphide and the copper ensures a reduction of the work hardness allowing to obtain a less hard surface and, during machining, to form chips that are also less hard at the machining temperature, resulting in a significant increase in the life of the tools.
  • the nitrogen concentration is between 0.03 and 0.05%.
  • the carbon concentration is less than 0.03%
  • This steel contains malleable oxides whose compositions are located on the ternary diagram AL 2 O 3 -SiO 2 -CaO, in the zone of the triple point anorthite, gehlenite and pseudo-wollastonite.
  • the nitrogen element introduced into the composition of austenitic stainless steels in a determined and limited proportion between 0.03 and 0.05% stabilizes the austenite at the expense of the formation of hardening martensite which tends to reduce the magnetic permeability .
  • the carbon concentration is less than 0.03%.
  • the copper element replacing sulfur and lead used alone and preferably with nitrogen, contributes to the stabilization of the austenite at the expense of the formation of the martensite for work hardening which results by a consequent reduction in magnetic permeability.
  • the austenitic stainless steel according to the invention has a set of characteristics and sometimes surprising physical properties, sometimes contradictory, such as machining, welding, cold deformation, non-magnetism and resistance to corrosion.
  • This reference steel is a referenced austenitic steel, the general composition of which is as follows: C less than 0.08%, Cr between 18 and 20%, Ni between 8 and 10.5%, S less than 0.03 %, Mo less than or equal to 0.5%, Nn less than or equal to 2% and N less than or equal to 0.1%.
  • the steel according to the invention has also been tested in "Gun Drilling" technology, that is to say in drilling with a guide gun and under high oil. pressure.
  • the choice of cutting conditions for good chip evacuation being assured, the machining of steel parts according to the invention is four times faster than with a reference steel and the number of parts machined before resharpening the tool is 6 times higher.
  • the steel according to the invention has a magnetic permeability of 1.4 (Curve G, Fig. 3) and only 1.9% of martensite is formed during wire drawing ( Curve E, Fig. 4).
  • the reference steel forms three times more martensite (curve F - Fig. 4) and therefore has a magnetic permeability of 2.4 (curve H - Fig. 3).
  • the passivation pH measured in a sodium chloride solution and defined by the pH above which the critical passivation current is less than 10 ⁇ A / cm 2 , is substantially equal to 3 with the steel according to the invention (curve J) and significantly lower than that of the reference steel which is 3.5 (curve K).
  • This area was compared with a non-heat affected area and found that this non-heat affected area includes the known sulfide inclusions of such resulfurized steel.
  • the steel according to the invention is suitable for machining at high speed, cold deformability comprising remarkable magnetic properties and a high resistance to cavernous corrosion as well as a capacity for welding.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Steroid Compounds (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Laminated Bodies (AREA)
EP93400903A 1992-04-17 1993-04-06 Acier inoxydable austénitique à haute usinabilité et à déformation à froid améliorée Expired - Lifetime EP0567365B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9204810 1992-04-17
FR9204810A FR2690169B1 (fr) 1992-04-17 1992-04-17 Acier inoxydable austénitique à haute usinabilité et à déformation à froid améliorée.

Publications (2)

Publication Number Publication Date
EP0567365A1 EP0567365A1 (fr) 1993-10-27
EP0567365B1 true EP0567365B1 (fr) 1997-07-02

Family

ID=9429029

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93400903A Expired - Lifetime EP0567365B1 (fr) 1992-04-17 1993-04-06 Acier inoxydable austénitique à haute usinabilité et à déformation à froid améliorée

Country Status (14)

Country Link
US (1) US5362439A (no)
EP (1) EP0567365B1 (no)
AT (1) ATE154953T1 (no)
CA (1) CA2094200C (no)
DE (1) DE69311839T2 (no)
DK (1) DK0567365T3 (no)
EG (1) EG19983A (no)
ES (1) ES2106297T3 (no)
FI (1) FI103416B1 (no)
FR (1) FR2690169B1 (no)
GR (1) GR3024678T3 (no)
IL (1) IL105338A (no)
NO (1) NO302830B1 (no)
TR (1) TR28589A (no)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2706489B1 (fr) * 1993-06-14 1995-09-01 Ugine Savoie Sa Acier inoxydable martensitique à usinabilité améliorée.
FR2720410B1 (fr) * 1994-05-31 1996-06-28 Ugine Savoie Sa Acier inoxydable ferritique à usinabilité améliorée.
FR2732694B1 (fr) * 1995-04-07 1997-04-30 Ugine Savoie Sa 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
FR2733252B1 (fr) * 1995-04-21 1997-05-23 Ugine Savoie Sa Acier inoxydable austenitique pour l'elaboration notamment de fil
US5512238A (en) * 1995-06-07 1996-04-30 Crs Holdings, Inc. Free-machining austenitic stainless steel
FR2757878B1 (fr) * 1996-12-31 1999-02-05 Sprint Metal Sa Fil trefile en acier inoxydable et procede de fabrication
FR2759709B1 (fr) * 1997-02-18 1999-03-19 Ugine Savoie Sa Acier inoxydable pour l'elaboration de fil trefile notamment de fil de renfort de pneumatique et procede de realisation dudit fil
FR2776306B1 (fr) * 1998-03-18 2000-05-19 Ugine Savoie Sa Acier inoxydable austenitique pour l'elaboration notamment de fil
FR2780735B1 (fr) * 1998-07-02 2001-06-22 Usinor Acier inoxydable austenitique comportant une basse teneur en nickel et resistant a la corrosion
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
JP4068556B2 (ja) * 2001-07-20 2008-03-26 ナムローゼ・フェンノートシャップ・ベーカート・ソシエテ・アノニム 集束伸線によるステンレス鋼繊維
JP6589536B2 (ja) * 2014-11-06 2019-10-16 日本製鉄株式会社 溶接継手の製造方法
CN113265585B (zh) * 2021-05-14 2023-02-24 山西太钢不锈钢股份有限公司 一种汽车安全气囊用不锈钢及其生产方法与应用

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3282684A (en) * 1963-07-31 1966-11-01 Armco Steel Corp Stainless steel and articles
US3282686A (en) * 1965-02-01 1966-11-01 Armco Steel Corp Stainless steel and articles
JPS5424364B2 (no) * 1973-05-04 1979-08-21
SE7705578L (sv) * 1976-05-15 1977-11-16 Nippon Steel Corp Tvafasigt rostfritt stal
DE3236215C2 (de) * 1982-03-13 1986-10-30 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren zur Erfassung des Betriebszustands rotierender Drehtrommeln zur Durchführung thermischer Prozesse und Vorrichtung zur berührungslosen Messung der Oberflächentemperatur flächenhafter, insbesondere sich bewegender Meßobjekte, z.B. rotierender Drehtrommeln wie Drehrohröfen
JPS61139651A (ja) * 1984-12-10 1986-06-26 Nippon Steel Corp 耐銹性と冷間加工性に優れたオ−ステナイト系ステンレス鋼
JPS61295356A (ja) * 1985-06-24 1986-12-26 Nisshin Steel Co Ltd 高強度ステンレス鋼
FR2648477B1 (fr) * 1989-06-16 1993-04-30 Ugine Savoie Sa Acier inoxydable austenitique resulfure a usinabilite amelioree

Also Published As

Publication number Publication date
US5362439A (en) 1994-11-08
CA2094200C (fr) 2002-08-13
NO302830B1 (no) 1998-04-27
FR2690169A1 (fr) 1993-10-22
IL105338A (en) 1997-02-18
EG19983A (fr) 1996-10-31
EP0567365A1 (fr) 1993-10-27
NO931384L (no) 1993-10-18
CA2094200A1 (fr) 1993-10-18
DE69311839T2 (de) 1997-11-13
IL105338A0 (en) 1993-08-18
FI931733A (fi) 1993-10-18
ATE154953T1 (de) 1997-07-15
GR3024678T3 (en) 1997-12-31
DK0567365T3 (da) 1998-02-16
FI931733A0 (fi) 1993-04-16
DE69311839D1 (de) 1997-08-07
NO931384D0 (no) 1993-04-15
FR2690169B1 (fr) 1994-09-23
TR28589A (tr) 1996-11-04
ES2106297T3 (es) 1997-11-01
FI103416B (fi) 1999-06-30
FI103416B1 (fi) 1999-06-30

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