EP1055011A1 - Austenitic stainless steel including columbium - Google Patents

Austenitic stainless steel including columbium

Info

Publication number
EP1055011A1
EP1055011A1 EP98965499A EP98965499A EP1055011A1 EP 1055011 A1 EP1055011 A1 EP 1055011A1 EP 98965499 A EP98965499 A EP 98965499A EP 98965499 A EP98965499 A EP 98965499A EP 1055011 A1 EP1055011 A1 EP 1055011A1
Authority
EP
European Patent Office
Prior art keywords
stainless steel
columbium
austenitic stainless
weight percent
max
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.)
Ceased
Application number
EP98965499A
Other languages
German (de)
English (en)
French (fr)
Inventor
James W. Underkofler
William W. Timmons
Ronald E. Bailey
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.)
Allegheny Ludlum Corp
Original Assignee
Allegheny Ludlum Corp
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 Allegheny Ludlum Corp filed Critical Allegheny Ludlum Corp
Publication of EP1055011A1 publication Critical patent/EP1055011A1/en
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • 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
    • C22C38/18—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
    • C22C38/18—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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling

Definitions

  • This invention relates generally to stainless steel alloys and more particularly to the
  • the T201LN alloy was specifically designed for such applications and is unique in that it is designated as an acceptable material for applications in which high
  • the compositionally-balanced T201LN alloy consists essentially of, in weight percent, 0.03% carbon max., 6.4 to 7.5% manganese, up to 1.0% silicon, 16 to 17.5% chromium, 4.0 to 5.0%
  • the present invention relates to methods for reliably producing high strength 201
  • T201LN alloy Laboratory heats of T201LN alloy, which were significantly alloyed with nitrogen ( ⁇ 0.15%) to stabilize the austenite, were made with varying amounts of
  • elongation is decreased from about 55% to 48%.
  • measured hardness is increased from about
  • Cb content is increased from about 0.003% to about 0.210%).
  • an object of the present invention is to reliably increase the strength of the T201LN alloy so that it may exceed the mechanical requirements of material specified for
  • the present invention is directed to an austenitic stainless
  • invention also is directed to a method for providing a high strength 201 series stainless steel wherein the method includes preparing a heat of a 201 series stainless steel and maintaining
  • FIG. 1 shows ferrite maps made on V.” thick slices, taken from the bottom of the
  • FIG. 2 is a schematic illustration of the tensile and subsize Charpy specimens which
  • FIG. 3 is a plot of the yield strength (0.2%) offset), obtained from tensile specimens of the laboratory melted material of T201LN alloy, as a function of Cb;
  • FIG. 4 is a plot of the ultimate strength, obtained from tensile specimens of the
  • FIG. 5 is a plot of the ferrite content, as measured with the Magne-Gage, of the as-
  • FIG. 6 is a plot of the magnetic response as measured with the Magne-Gage on the
  • FIG. 7 is a plot of the % elongation, obtained from tensile specimens of the laboratory melted material of T201 LN alloy, as a function of Cb;
  • FIG. 8 is a plot of the hardness, obtained from tensile specimens of the laboratory
  • FIG. 9 is a plot of the grain size as a function of Cb obtained by metallographic
  • FIG. 10 is a plot of the impact energies as a function of Cb content for the testing of
  • FIG. 11 is a plot of the percent shear as a function of Cb content for the testing of
  • FIG. 12 is a plot of the lateral expansion as a function of Cb content for the testing of subsize Charpy samples ( ⁇ 0.180" thick) at -320, -50 and 70°F. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • the initial testing involved providing eleven groups of plates from the four heats as
  • the pressure vessel code requires a minimum of 15 mils lateral expansion after welding.
  • Heat 2C153, yield strength was 46,600 psi).
  • the fourth heat (Heat 2C078) as shown has acceptable strength, which appears to result from the .05% Cb addition, as is discussed later. Finer grain size also results from the
  • Heat 2C078 shows considerably higher yield and tensile strength than the other heats
  • composition for higher tensile strength would be of value.
  • Cb is sufficient to enhance the strength mechanical properties of this alloy without significantly degrading any of the other mechanical properties.
  • Table 1 contains the chemistries of the three
  • grain size of each sample was estimated per ASTM E 112 using the comparison procedure with the following two exceptions. The first is that the photomicrographs were taken at a
  • Table 2 contains the results which were obtained on or from the testing of the tensile
  • Table 3 contains the results obtained from testing of the Charpy specimens.
  • this material had the highest ferrite level (-2.5%) as measured on the tensile blanks, before testing.
  • Figure 5 is a plot of the ferrite content measured on the tensile blanks before testing.
  • the magnetic response (FN) was also measured along the shaft of the tensile
  • Cb is a strong stabilizer (i.e., retards the formation chromium
  • Rb and grain size is decreased from ASTM 6.5 to ASTM 10 as Cb content is increased from 0.003% to 0.210%.
  • the impact energy is increased as Cb content is increased up to about .10%) at the three temperatures tested.
  • Ductility remains relatively high at -50 and 70°F. At above about .10% Cb. a decrease, but

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
EP98965499A 1997-12-23 1998-12-23 Austenitic stainless steel including columbium Ceased EP1055011A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US6854197P 1997-12-23 1997-12-23
US68541P 1997-12-23
PCT/US1998/027602 WO1999032682A1 (en) 1997-12-23 1998-12-23 Austenitic stainless steel including columbium

Publications (1)

Publication Number Publication Date
EP1055011A1 true EP1055011A1 (en) 2000-11-29

Family

ID=22083224

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98965499A Ceased EP1055011A1 (en) 1997-12-23 1998-12-23 Austenitic stainless steel including columbium

Country Status (8)

Country Link
EP (1) EP1055011A1 (https=)
JP (1) JP2001527156A (https=)
KR (1) KR100618715B1 (https=)
CN (1) CN1110577C (https=)
AU (1) AU2095499A (https=)
BR (1) BR9814425A (https=)
CA (1) CA2316332C (https=)
WO (1) WO1999032682A1 (https=)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1091006B1 (en) * 1999-10-04 2004-12-08 Hitachi Metals, Ltd. Process of producing steel strip or sheet comprising strain-induced martensite
JP5395805B2 (ja) 2007-11-29 2014-01-22 エイティーアイ・プロパティーズ・インコーポレーテッド オーステナイト系のリーンステンレス鋼
US8337749B2 (en) * 2007-12-20 2012-12-25 Ati Properties, Inc. Lean austenitic stainless steel
BRPI0820024B1 (pt) 2007-12-20 2018-06-12 Ati Properties Llc Aço inoxidável austenítico pobre resistente à corrosão e artigo de fabricação incluindo este
CA2706473A1 (en) 2007-12-20 2009-07-02 Ati Properties, Inc. Austenitic stainless steel low in nickel containing stabilizing elements
ITRM20120647A1 (it) * 2012-12-19 2014-06-20 Ct Sviluppo Materiali Spa ACCIAIO INOSSIDABILE AUSTENITICO AD ELEVATA PLASTICITÀ INDOTTA DA GEMINAZIONE, PROCEDIMENTO PER LA SUA PRODUZIONE, E SUO USO NELLÂeuro¿INDUSTRIA MECCANICA.
JP7462439B2 (ja) * 2020-03-12 2024-04-05 日鉄ステンレス株式会社 オーステナイト系ステンレス鋼およびｎの上限値の算出方法
IT202200018135A1 (it) * 2022-09-05 2024-03-05 Gas And Heat S P A Acciaio per il trasporto e lo stoccaggio di ammoniaca liquida

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5763666A (en) * 1981-08-12 1982-04-17 Nisshin Steel Co Ltd Warm water container with high yield strength and corrosion resistance
US4568387A (en) * 1984-07-03 1986-02-04 Allegheny Ludlum Steel Corporation Austenitic stainless steel for low temperature service
JPH0629459B2 (ja) * 1986-11-22 1994-04-20 株式会社神戸製鋼所 Ｎｂ▲下３▼Ｓｎ生成熱処理後の極低温特性に優れたオ−ステナイト系ステンレス鋼の製造方法
JP2618151B2 (ja) * 1992-04-16 1997-06-11 新日本製鐵株式会社 高強度・非磁性ステンレス鋼線材
FR2691982B1 (fr) * 1992-06-04 1994-08-26 Aubert Duval Composition d'acier inoxydable pour pièces utilisées en ultravide et à basse température.
JP3242522B2 (ja) * 1994-02-22 2001-12-25 新日本製鐵株式会社 高冷間加工性・非磁性ステンレス鋼
JPH07314178A (ja) * 1994-05-27 1995-12-05 Nippon Steel Corp オーステナイト系ステンレス鋼用ガスシールド溶接ワイヤ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9932682A1 *

Also Published As

Publication number Publication date
WO1999032682A1 (en) 1999-07-01
KR100618715B1 (ko) 2006-08-31
CN1285005A (zh) 2001-02-21
HK1032078A1 (en) 2001-07-06
AU2095499A (en) 1999-07-12
BR9814425A (pt) 2002-07-23
CA2316332C (en) 2013-02-19
CN1110577C (zh) 2003-06-04
CA2316332A1 (en) 1999-07-01
JP2001527156A (ja) 2001-12-25
KR20010033526A (ko) 2001-04-25

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