EP2199419B1 - Austenitischer edelstahl - Google Patents

Austenitischer edelstahl Download PDF

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Publication number
EP2199419B1
EP2199419B1 EP08836524.2A EP08836524A EP2199419B1 EP 2199419 B1 EP2199419 B1 EP 2199419B1 EP 08836524 A EP08836524 A EP 08836524A EP 2199419 B1 EP2199419 B1 EP 2199419B1
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Prior art keywords
content
cracking
austenitic stainless
steels
mentioned
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EP08836524.2A
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English (en)
French (fr)
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EP2199419A4 (de
EP2199419A1 (de
Inventor
Hiroyuki Hirata
Kazuhiro Ogawa
Takahiro Osuki
Hirokazu Okada
Hiroyuki Semba
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Nippon Steel Corp
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Nippon Steel and Sumitomo Metal Corp
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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
    • C22C38/001—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
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C22C38/52—Ferrous alloys, e.g. steel alloys containing chromium with nickel with cobalt
    • 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
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • 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

  • Patent Document 4 discloses an austenitic stainless steel, excellent in creep characteristics and hot workability, which satisfies the three relationships, namely the relationship between P and Cu, the relationship between sol. Al and N, and the relationship between O and Cu, respectively.
  • the Non-Patent Document 3 describes investigations made in search of means for preventing intergranular cracking in the HAZ in the welded portion of 18Cr-8Ni-Nb type austenitic stainless heat resistant steels, if heated for a long period of time.
  • Mn like Si, has a deoxidizing effect. Mn also contributes toward stabilization of the austenite phase. However, when the content thereof is excessive, in particular at a content level exceeding 2.0%, it causes embrittlement and thus deteriorates the creep ductility and toughness. Therefore, the content of Mn is set to not more than 2.0%. More preferably, the content of Mn is not more than 1.5%.
  • Cr is an essential element for ensuring the oxidation resistance and corrosion resistance at high temperatures and, in order to obtain the said effects, it is necessary that the Cr content be not less than 15%. However, when the content thereof is excessive, in particular at a content level exceeding 30%, it deteriorates the stability of the austenite phase at high temperatures and thus causes a decrease in creep strength. Therefore, the content of Cr is set to 15 to 30%.
  • the preferable lower limit of the Cr content is 16% and the preferable upper limit thereof is 28%.
  • Each of Cu, Mo, W, Co, Ta, Zr and Hf being elements of the first group, if added, has the effect of enhancing the high temperature strength.
  • the said elements may be added to the steels and thereby contained therein. The elements, which are in the first group, are now described in detail.
  • the cold working may be carried out after the hot working.
  • the cold working may include the cold drawing pipe manufacturing process in which the pipe produced by the above-mentioned hot working is subjected to drawing and/or the cold rolling pipe manufacturing process using a cold pilger mill.
  • the cold working may include the typical process of manufacturing a cold rolled steel sheet in coil.
  • the final heat treatment after the above-mentioned hot working or the final heat treatment after a further cold working following the hot working may be carried out at a heating temperature of not less than 1030°C.
  • the upper limit of the said heating temperature is not particularly defined, but a temperature exceeding 1350°C may cause not only high temperature intergranular cracking or a deterioration of ductility but also very coarse grains. Moreover, the said temperature may cause a marked deterioration of workability. Therefore, the upper limit of the heating temperature is preferably set to 1350°C.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Claims (3)

  1. Austenitischer nichtrostender Stahl, der in Masseprozent C: 0,04 bis 0,18%, Si: 0,02 bis 1,5%, Mn: 0,02 bis 2,0%, Ni: 6 bis 30%, Cr: 15 bis 30%, N: 0,03 bis 0,35%, lösl. Al; ein oder mehr Elemente, die aus Nb: nicht mehr als 1,0%, V: nicht mehr als 0,5% und Ti: nicht mehr als 0,5% ausgewählt sind; und optional ein oder mehr Elemente aus ein oder mehr Gruppen, die aus den unten aufgelisteten ersten bis dritten Gruppen ausgewählt sind, umfasst, wobei der Rest Fe und Verunreinigungen sind:
    Erste Gruppe: Cu: nicht mehr als 4%, Mo: nicht mehr als 2%, W: nicht mehr als 2%, Co: nicht mehr als 1%, Ta: nicht mehr als 0,1%, Zr: nicht mehr als 0,1% und Hf: nicht mehr als 0,1%;
    Zweite Gruppe: B: nicht mehr als 0,012%; und
    Dritte Gruppe: Ca: nicht mehr als 0,02%, Mg: nicht mehr als 0,02% und Seltenerdelement: nicht mehr als 0,1%,
    wobei die Gehalte an P und S unter den Verunreinigungen P: nicht mehr als 0,04% und S: nicht mehr als 0,03% betragen und
    wobei der Wert von P1, der durch die folgende Formel (1) definiert wird, die Bedingung P1 ≤ 0,06 erfüllt: P 1 = S + P + Sn / 2 + As + Zn + Pb + Sb / 5
    Figure imgb0007
     wobei jedes Elementsymbol in der Formel (1) den Gehalt in Masseprozent des betreffenden Elements darstellt,
    dadurch gekennzeichnet, dass
    lösl. Al 0,0005 bis 0,03% beträgt,
    die Gehalte an Sn, As, Zn, Pb und Sb unter den Verunreinigungen Sn: nicht mehr als 0,1%, As: nicht mehr als 0,01%, Zn: nicht mehr als 0,01%, Pb: nicht mehr als 0,01% und Sb: nicht mehr als 0,01% betragen und
    der Wert von P2, der durch die folgende Formel (2) definiert wird, die Bedingung 0,2 ≤ P2 ≤ 1,7 - 10 × P1 erfüllt: P 2 = Nb + 2 V + Ti
    Figure imgb0008
    wobei jedes Elementsymbol in der Formel (2) den Gehalt in Masseprozent des betreffenden Elements darstellt.
  2. Austenitischer nichtrostender Stahl nach Anspruch 1, der in Masseprozent C: 0,05 bis 0,15%, Si: 0,02 bis 1,0%, Ni: 6 bis 13%, Cr: 15 bis 25% und N: 0,03 bis 0,15% umfasst und wobei der Wert von P2 die Bedingung 0,3 ≤ P2 ≤ 1,7 - 10 × P1 erfüllt.
  3. Austenitischer nichtrostender Stahl nach Anspruch 1, der in Masseprozent Ni: mehr als 13% bis nicht mehr als 30% und N: 0,10 bis 0,35% umfasst und wobei der Wert von P2 die Bedingung 0,2 ≤ P2 ≤ 1,3 - 10 × P1 erfüllt.
EP08836524.2A 2007-10-03 2008-10-02 Austenitischer edelstahl Active EP2199419B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2007259387 2007-10-03
JP2007259654 2007-10-03
PCT/JP2008/067905 WO2009044796A1 (ja) 2007-10-03 2008-10-02 オーステナイト系ステンレス鋼

Publications (3)

Publication Number Publication Date
EP2199419A1 EP2199419A1 (de) 2010-06-23
EP2199419A4 EP2199419A4 (de) 2016-07-06
EP2199419B1 true EP2199419B1 (de) 2018-03-07

Family

ID=40526220

Family Applications (1)

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EP08836524.2A Active EP2199419B1 (de) 2007-10-03 2008-10-02 Austenitischer edelstahl

Country Status (7)

Country Link
US (1) US20100034689A1 (de)
EP (1) EP2199419B1 (de)
JP (1) JP4258678B1 (de)
KR (1) KR20100059957A (de)
CN (1) CN101784687B (de)
ES (1) ES2668831T3 (de)
WO (1) WO2009044796A1 (de)

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JP4258678B1 (ja) 2009-04-30
EP2199419A4 (de) 2016-07-06
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JPWO2009044796A1 (ja) 2011-02-10
KR20100059957A (ko) 2010-06-04
CN101784687A (zh) 2010-07-21
ES2668831T3 (es) 2018-05-22
CN101784687B (zh) 2011-04-27
US20100034689A1 (en) 2010-02-11

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