EP1431408B1 - Acier inoxydable austénitique CrNiMnCu à basse teneur en nickel - Google Patents

Acier inoxydable austénitique CrNiMnCu à basse teneur en nickel Download PDF

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Publication number
EP1431408B1
EP1431408B1 EP02028526A EP02028526A EP1431408B1 EP 1431408 B1 EP1431408 B1 EP 1431408B1 EP 02028526 A EP02028526 A EP 02028526A EP 02028526 A EP02028526 A EP 02028526A EP 1431408 B1 EP1431408 B1 EP 1431408B1
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EP
European Patent Office
Prior art keywords
stainless steel
austenitic stainless
nickel
manganese
ferrite
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Revoked
Application number
EP02028526A
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German (de)
English (en)
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EP1431408A1 (fr
Inventor
Meng-Hsin Hsieh
Yi-Cheng Wu
Pei-Te Huang
Hao-Shang Liu
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Yieh United Steel Corp
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Yieh United Steel Corp
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Priority to PT02028526T priority Critical patent/PT1431408E/pt
Priority to EP02028526A priority patent/EP1431408B1/fr
Priority to DE60216304T priority patent/DE60216304T2/de
Priority to SI200230469T priority patent/SI1431408T1/sl
Priority to DK02028526T priority patent/DK1431408T3/da
Application filed by Yieh United Steel Corp filed Critical Yieh United Steel Corp
Priority to AT02028526T priority patent/ATE346174T1/de
Priority to ES02028526T priority patent/ES2277611T3/es
Publication of EP1431408A1 publication Critical patent/EP1431408A1/fr
Publication of EP1431408B1 publication Critical patent/EP1431408B1/fr
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Anticipated expiration legal-status Critical
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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
    • C22C38/18—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
    • C22C38/18—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

Definitions

  • This invention relates to an austenitic stainless steel, more particularly to a low nickel containing chromium-nickel-manganese-copper austenitic stainless steel.
  • U.S. Patent No. 5,286,310 discloses a low nickel containing chromium-nickel-manganese-copper austenitic stainless steel that has a reduced nickel content and acceptable metallographic structure, mechanical strength, corrosion resistance and workability.
  • the aforesaid austenitic stainless steel contains at least 16.5% by weight of chromium so as to provide acceptable corrosion resistance. However, the chromium content should not exceed 17.5% by weight so as to prevent undesired formation of delta ferrite ( ⁇ -ferrite) during hot working and impairment to hot workability.
  • the aforesaid austenitic stainless steel further contains at least 2.5% by weight of nickel so as to improve cold workability and so as to inhibit transformation of austenite into martensite. However, nickel content should not exceed 5% by weight due to the relatively high price thereof.
  • the aforesaid austenitic stainless steel is capable of providing acceptable corrosion resistance and cold or hot workability, the chromium content thereof is still high (previous investigation has shown that at least 17% by weight of chromium is necessary to provide minimum levels of corrosion resistance), which can impair stability of the austenitic stainless steel and which can cause cracking during hot rolling.
  • ES 2142756 discloses austenitic stainless steels developed as potential replacements for AISI 304 and AISI 316.
  • an austenitic stainless steel that comprises: (a) 0.03wt% to 0.12wt% of C; (b) 0.2wt% to 1.0wt% of Si; (c) 7.5wt% to 10.5wt% of Mn; (d) 14.0wt% to 16.0wt% of Cr; (e) 1.0wt% to 5.0wt% of Ni; (f) 0.04wt% to 0.25wt% of N; (g) 1.0wt% to 3.5wt% of Cu; (h) trace amount of Mo; and the balance being Fe and incidental impurities.
  • the preferred embodiment of the low nickel containing chromium-nickel-manganese-copper austenitic stainless steel of the present invention comprises: (a) 0.03wt% to 0.12wt% of C; (b) 0.2wt% to 1.0wt% of Si; (c) 7.5wt% to 10.5wt% of Mn; (d) 14.0wt% to 16.0wt% of Cr; (e) 1.0wt% to 5.0wt% of Ni; (f) 0.04wt% to 0.25wt% of N; (g) 1.0wt% to 3.5wt% of Cu; (h) trace amount of Mo; and the balance being Fe and incidental impurities.
  • the austenitic stainless steel can further comprise 5 to 30 ppm of B so as to improve hot workability.
  • the contents of harmful impurities, such as S (sulfur) and P (phosphorous), are as small as possible.
  • S (sulfur) and P (phosphorous) are as small as possible.
  • the S content is limited to 150 ppm
  • the P content is limited to 0.06wt%.
  • Fig. 1 illustrates the relationship between the ⁇ -ferrite content of the preferred embodiment of the austenitic stainless steel of this invention and temperature. The results show that when temperature is raised to above 1250°C during hot rolling, the ⁇ -ferrite content rises sharply, which results in the risk of edge cracking of a rolled plate of the austenitic stainless steel. In addition, a minimum temperature of 1050°C during hot rolling is required so as to obtain the requisite mechanical strength.
  • Table 1 illustrates an edge crack effect test for different test specimens of the austenitic stainless steel of Examples 1 to 9 and comparative Examples 1 to 5, which differ in composition (only elements Ni, C, Si, Mn, Cr, and Cu are shown).
  • the test was conducted by hot rolling at a temperature ranging from 1050°C to 1250°C.
  • the test results show that each Example of the austenitic stainless steel of this invention has a ⁇ -ferrite content less than 8.5, and that no edge crack was observed for the test specimens of Examples 1 to 9.
  • Each of the test specimens of the Comparative Examples 1 to 5 has a ⁇ -ferrite content greater than 8.5. Edge cracks were found in each of the test specimens of the Comparative Examples 1 to 5.
  • Table 2 illustrates a corrosion resistance test (ASTM B117) using salt fog for different test specimens of the austenitic stainless steel of Examples 10 to 12 and comparative Example 6 (type 304 stainless steel), which differ in composition (only elements Ni, C, Si, Mn, Cr, Cu, and B are shown).
  • the test results show that each Example of the austenitic stainless steel of this invention has a corrosion rate that is as low as that of the type 304 stainless steel (no more than 0.1%) of the prior art.
  • the chromium content in each of the Examples 1 to 12 of the austenitic stainless steel of this invention is less than 17wt%, which is a minimum requirement of the prior art for providing minimum levels of corrosion resistance.
  • Table 3 illustrates compositions of test specimens of the austenitic stainless steel of Examples 13 to 22 and comparative Examples 7 to 10 (only elements Ni, C, Si, Mn, Cr, and Cu are shown).
  • Table 4 illustrates a mechanical strength test for the test specimens of the austenitic stainless steel of the Examples 13 to 22 and the comparative Examples 7 to 10. The test results show that the austenitic stainless steel of this invention has an elongation better than those of type 304 stainless steel of the prior art. Other mechanical properties, such as tensile strength, yield strength, and hardness, of the austenitic stainless steel of this invention are comparable to those of type 304 stainless steel of the prior art.
  • the austenitic stainless steel of this invention is capable of exhibiting excellent mechanical strength, corrosion resistance, and phase stability during hot or cold working with a relatively low nickel content and a low chromium content as compared to those of the prior art.

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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)
  • Catalysts (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Claims (3)

  1. Un acier inoxydable austénitique ayant
    (a) 0,03 pds% à 0,064 pds% de C
    (b) 0,2 pds% à 1,0 pds% de Si
    (c) 7,5 pds% à 10,5 pds% de Mn
    (d) 14,0 pds% à 16,0 pds% de Cr
    (e) 1,0 pds% à 5,0 pds% de Ni
    (f) 0,04 pds% à 0,25 pds% de N
    (g) 1,0 pds% à 3,5 pds% de Cu
    (h) un montant trace de Mo ; et
    le reste étant Fe et des impuretés accessoires ;
    et en option un ou plus des suivants :
    5 à 30 ppm de B
    pas plus que 150 ppm de S et/ou
    pas plus que 0,06 pds% de P
    où ledit acier inoxydable austénitique a une teneur en ferrite δ qui est inférieure à 8,5 et qui satisfait la formule suivante : ferrite δ = 6 , 77 [ d + h + 1 , 5 b ] - 4 , 85 ( e ) + 30 a + 30 f + 0 , 5 c + 0 , 3 g - 52 , 75 ,
    Figure imgb0005
    où l'allongement est entre 53,1 et 55,3% et la dureté est entre 82,3 et 84,7 HRBO.
  2. L'acier inoxydable austénitique selon la revendication 1 caractérisé en ce que la limite d'élasticité est entre 287,6 et 319,7 MPa.
  3. L'acier inoxydable austénitique selon la revendication 1 ou 2 caractérisé en ce que la résistance à la traction dudit acier inoxydable austénitique est entre 618,4 et 642,6 MPa.
EP02028526A 2002-12-19 2002-12-19 Acier inoxydable austénitique CrNiMnCu à basse teneur en nickel Revoked EP1431408B1 (fr)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP02028526A EP1431408B1 (fr) 2002-12-19 2002-12-19 Acier inoxydable austénitique CrNiMnCu à basse teneur en nickel
DE60216304T DE60216304T2 (de) 2002-12-19 2002-12-19 Austenitischer rostfreier CrNiMnCu Stahl mit niedrigem Nickelgehalt
SI200230469T SI1431408T1 (sl) 2002-12-19 2002-12-19 AVSTENTIÄŚNO NERJAVEÄŚE CrNiMnCu JEKLO Z NIZKO VSEBNOSTJO NIKLJA
DK02028526T DK1431408T3 (da) 2002-12-19 2002-12-19 Austenitisk rustfrit stål med lavt nikkelindhold og indeholdende chrom-nikkel-mangan-kobber
PT02028526T PT1431408E (pt) 2002-12-19 2002-12-19 Aço inoxidável austenítico de crómio-níquel-manganésio-cobre contendo pouco níquel.
AT02028526T ATE346174T1 (de) 2002-12-19 2002-12-19 Austenitischer rostfreier crnimncu stahl mit niedrigem nickel-gehalt
ES02028526T ES2277611T3 (es) 2002-12-19 2002-12-19 Acero inoxidable austenitico crnimncu con bajo contenido en niquel.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02028526A EP1431408B1 (fr) 2002-12-19 2002-12-19 Acier inoxydable austénitique CrNiMnCu à basse teneur en nickel

Publications (2)

Publication Number Publication Date
EP1431408A1 EP1431408A1 (fr) 2004-06-23
EP1431408B1 true EP1431408B1 (fr) 2006-11-22

Family

ID=32338054

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02028526A Revoked EP1431408B1 (fr) 2002-12-19 2002-12-19 Acier inoxydable austénitique CrNiMnCu à basse teneur en nickel

Country Status (7)

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EP (1) EP1431408B1 (fr)
AT (1) ATE346174T1 (fr)
DE (1) DE60216304T2 (fr)
DK (1) DK1431408T3 (fr)
ES (1) ES2277611T3 (fr)
PT (1) PT1431408E (fr)
SI (1) SI1431408T1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2163659A1 (fr) 2008-09-11 2010-03-17 ThyssenKrupp Nirosta GmbH Acier inoxidable, bande froide fabriquée à partir de cet acier et procédé de fabrication d'un produit plat en acier à partir de cet acier

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE533635C2 (sv) 2009-01-30 2010-11-16 Sandvik Intellectual Property Austenitisk rostfri stållegering med låg nickelhalt, samt artikel därav
FI125442B (fi) * 2010-05-06 2015-10-15 Outokumpu Oy Matalanikkelinen austeniittinen ruostumaton teräs ja teräksen käyttö
CN112593059B (zh) * 2020-12-02 2022-05-24 成都先进金属材料产业技术研究院有限公司 降低马氏体不锈钢中δ铁素体含量的热变形方法

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB995068A (en) * 1963-10-14 1965-06-10 Allegheny Ludlum Steel Improvements in or relating to austenitic stainless steel
BE754371A (fr) * 1970-01-13 1971-01-18 Nisshin Steel Co Ltd Aciers inoxydables austenitiques
SE453998B (sv) * 1980-05-05 1988-03-21 Armco Inc Austenitiskt rostfritt stal
JPS61124556A (ja) * 1984-11-20 1986-06-12 Kawasaki Steel Corp 低ニツケルオ−ステナイト系ステンレス鋼板およびその製造方法
US4946644A (en) * 1989-03-03 1990-08-07 Baltimore Specialty Steels Corporation Austenitic stainless steel with improved castability
ES2142756B1 (es) * 1998-04-22 2000-12-16 Acerinox Sa Acero inoxidable austenitico con bajo contenido en niquel.
GB2359095A (en) * 2000-02-14 2001-08-15 Jindal Strips Ltd Stainless steel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2163659A1 (fr) 2008-09-11 2010-03-17 ThyssenKrupp Nirosta GmbH Acier inoxidable, bande froide fabriquée à partir de cet acier et procédé de fabrication d'un produit plat en acier à partir de cet acier

Also Published As

Publication number Publication date
PT1431408E (pt) 2007-02-28
ES2277611T3 (es) 2007-07-16
EP1431408A1 (fr) 2004-06-23
DE60216304D1 (de) 2007-01-04
DE60216304T2 (de) 2007-06-21
ATE346174T1 (de) 2006-12-15
SI1431408T1 (sl) 2007-06-30
DK1431408T3 (da) 2007-03-12

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