EP0897018A1 - Duplexstahl mit hoher Festigkeit und Korrosionsbeständigkeit - Google Patents
Duplexstahl mit hoher Festigkeit und Korrosionsbeständigkeit Download PDFInfo
- Publication number
- EP0897018A1 EP0897018A1 EP98890210A EP98890210A EP0897018A1 EP 0897018 A1 EP0897018 A1 EP 0897018A1 EP 98890210 A EP98890210 A EP 98890210A EP 98890210 A EP98890210 A EP 98890210A EP 0897018 A1 EP0897018 A1 EP 0897018A1
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- EP
- European Patent Office
- Prior art keywords
- alloy
- max
- weight
- duplex
- austenite
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- 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.)
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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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Definitions
- the invention relates to a duplex alloy for components subject to complex stress high corrosion resistance and high strength containing the Alloy components Si, Mn, Cr, Mo. Ni, W, N, Al and V, balance Fe and Accompanying elements, which in the heat-treated state are essentially Sigma-phase and nitride-free microstructure and a material strength RM of greater than 800 MPa, a 0.2 proof stress of at least 600 MPa and one Charpy V toughness greater than 125 joules.
- Duplex alloys are materials for complex components, which high mechanical values regarding the strength and toughness of the material have and a toughness transition temperature of below - 20 ° C if possible should have. Furthermore, the corrosion resistance of the duplex alloys of great importance because these, abbreviated to DSS (duplex stainless steel), in corrosive media in the chemical industry and especially in the OFFSHORE TECHNOLOGY can be used for system components. A good Weldability while avoiding any cracks and maintaining the Corrosion resistance in the zone affected by welding are further requirements for such materials.
- the invention is based on this prior art (EP-455 625-B) the task of creating a generic duplex alloy, which both in the corrosion and welding property is improved as well as higher mechanical material values and a material strength RM of greater than 800 MPa, a 0.2 proof stress of at least 600 MPa and one Charpy V toughness greater than 125 joules.
- the advantages of the duplex alloy according to the invention are in particular that this improved corrosion resistance and increased mechanical Has properties of the material at the same time. Furthermore, the Temperature range for solution annealing before the cooling of the raw or components expanded so that the heat treatment to adjust the desired austenite-ferrite structure in the structure less accuracy Execution demands or the generation security is significantly improved. It lies namely with this new alloy through the total effect of the intended Elements in a wide solution annealing temperature range essentially constant and in this form desired ratio of ferrite to austenite in Material before, which is an advantageous latitude regarding the temperature control in the heat treatment. This gives another advantage to one Use of the alloy according to the invention that also with thick-walled parts a microstructure which is substantially uniform over the cross section are.
- the composition of the duplex material according to the invention in each case within narrow limits.
- Chromium, molybdenum, tungsten and nitrogen generally improve with increasing contents the corrosion resistance of the material, however indicate in their effect and mutual influence of the structural morphology pronounced limits. If the requirements are exceeded Limits of 26.0, 5.0, 1.0 and 0.39 in% by weight for the above Elements have been found to promote the formation of the sigma phase and Nitrides excreted. As a result or exacerbate these excretions not only the mechanical properties and the weldability of the Material leaps and bounds, the corrosion resistance of it is also affected by a so-called phase limit depletion adversely affected. At Concentrations below 24 wt% Cr, 4 wt% Mo, 0.51 wt% W and The corrosion resistance is reduced in particular below 0.351% by weight of N. and especially the strength of the alloy.
- a comparatively high nitrogen content within narrow limits from 0.351 to 0.39 % By weight is important in the material according to the invention, because thereby how Surprisingly, it was found to be an advantageously homogeneous Distribution of elements between austenite and ferrite in the structure is achieved with In other words, chrome, tungsten and molybdenum are made by the high Compensating nitrogen contents from the usually alloyed ferrite in the alloyed austenite, which is a significant increase in Corrosion resistance and the tendency to excrete the SIGMA phase largely suppressed.
- manganese in one Concentration range of 2.5 to 3.5 wt .-% is present because manganese on the one hand Nitrogen solubility increased and on the other hand has an austenite-forming function. Contents of more than 3.5% by weight of Mn increase the austenite content in the structure, however, reduce the corrosion resistance, and may also have an effect disadvantageous in terms of the achievable material strength and in particular secure setting of a desired ratio of ferrite to austenite at the Heat treatment of the parts. Increase manganese contents lower than 2.5% by weight however, the activity of nitrogen in the steel and therefore the risk of Nitride deposits and also change the phase distribution of the structure in disadvantageously.
- the content of austenite in the structure is greater than that of the ferrite at a high nitrogen content according to the invention due to the corresponding contents of Mn, Cr, Mo, W, Ni, as the results of the investigation showed, the tendency to form nitrides, in particular chromium nitride ( Cr 2 N), largely suppressed, whereby the best corrosion resistance of the material can be achieved.
- Ni contents higher than 7.5% by weight have an extraordinary effect in the alloy stabilizing, resulting in long thermal treatment times and unevenly high
- austenite levels depending on the temperature with lower ones Concentrations than 6.5% by weight of nickel have higher ferrite contents with the resultant cause excretions.
- Tungsten fractions of 0.5 to 1.0% by weight increase the corrosion resistance and reduce the tendency to form intermetallic phases in the Heat treatment of the material. At W contents below 0.5% by weight they are mechanical material properties deteriorated, whereas the limit of W values exceeding 1.0% by weight can cause production disadvantages.
- the alloy component vanadium as a strong nitride former is in the intended Limits in terms of fine microstructure and high homogeneity meaningful of the material. Vanadium contents higher than 0.2% by weight mask nitrogen and form harmful, especially row-shaped Nitrides, whereas lower levels of vanadium are no longer effective are, so that coarse grain can arise disadvantageously. This also applies to the in this regard partially substitutable elements Ti and Nb / Ta.
- Silicon contents in the range between 0.2 and 0.8 wt .-% are with regard to the Material quality is important. Lower concentrations of Si can increase Oxygen levels and a poor degree of purity of the material cause. High values above 0.8% by weight influence the due to the ferrite-forming and nitride-forming effects of Si Phase formation disadvantageous. Another disadvantage of higher Si contents is that these favor the formation of intermetallic phases or precipitations
- Aluminum contents of 0.003 to 0.006% by weight are provided in the alloy. Higher Al contents again promote nitride formation and thereby Reduction of the proportion of dissolved nitrogen with all of the above Disadvantages and smaller aluminum values increase the tendency to form coarse grains.
- the austenite is compared to the ferrite Phase with the lower hardness and strength, it is for components from the alloy according to the invention important that the volume fraction of austenite is greater than that of the ferrite is present in the structure. On the one hand, this increases the tendency formation of chromium nitride, which worsens the Usage properties of the part causes, reduced, on the other hand, the Austenite phase due to the dissolved nitrogen with regard to the mechanical Properties improved.
- the new duplex steel according to the invention in specialist circles HDSS (Hyper-Duplex-Stainless- Steel) connects the lowest differences in corrosion potential between alpha and gamma or maximum corrosion resistance and optimal Phase formation kinetics with largely homogeneous distribution of elements between Ferrite and austenite and is therefore concerning the chemical attack that Weldability and the strength properties of the generic Superior materials according to the state of the art.
- HDSS Hydro-Duplex-Stainless- Steel
- the PREN factor calculated from the current alloy composition a value between 44.6 and 49.5, preferably between 45.5 and 48.0, exhibits the highest corrosion resistance of the duplex material become.
- the heat treatment uses a ratio of ferrite to austenite in the structure between 0 , 42 and 0.8, preferably between 0.60 and 0.69, is set, the proportion of the sigma phase and the nitride proportion and the proportion of carbides being less than 5% by weight, preferably less than 0.5% by weight is.
- the good weldability of the material is further improved, with practically none in particular in the zones of the base material which are influenced by the welding Impairment of the properties are caused.
- the homogeneity of the material properties especially with regard to a mechanical stress, but also the local corrosion behavior be brought to a higher level if one is made of duplex alloy formed part has a degree of deformation of at least 2.5 times, in particular of at least 3.8 times, the degree of deformation being the sum of the Reduction of the cross-sectional area is to be understood.
- Tab. 1 shows the chemical composition and the PREN factor achieved of examined melts or samples.
- Tab. 2 shows the heat treatment and the test results compiled.
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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)
Abstract
Description
Beeinträchtigung der Eigenschaften bewirkt sind.
Es zeigen
Claims (5)
- Duplexlegierung für komplex beanspruchte Bauteile mit hoher Korrosionsbeständigkeit und hoher Festigkeit enthaltend die Legierungsbestandteile Si, Mn, Cr, Mo, Ni, W, N, Al und V, Rest Fe und Begleitelemente, welche Legierung in wärmebehandeltem Zustand ein im wesentlichen sigmaphasen- und nitridfreies Mischgefüge und eine Materialfestigkeit RM von größer als 800 MPa, eine 0,2 Dehngrenze RP 0,2 von mindestens 600 MPa und eine Charpy-V-Zähigkeit von höher als 125 Joule aufweist, dadurch gekennzeichnet, daß die Legierung eine chemische Zusammensetzung in Gew.-% vonKohlenstoff max 0,04Silizium 0,21 bis 0,82Mangan 2,50 bis 3,50Phosphor max. 0,03Schwefel max. 0,005Chrom 24,0 bis 26,0Molybdän 4,0 bis 5,0Nickel 6,51 bis 7,50Wolfram 0,51 bis 1,00Kupfer max. 0,8Stickstoff 0,351 bis 0,39Vanadin 0,021 bis 0,202Niob/Tantal 0 bis 0,1Calzium 0 bis 0,05Magnesium 0 bis 0,025Aluminium 0,003 bis 0,062Bor max. 0,003
- Duplexlegierung nach Anspruch 1, dadurch gekennzeichnet, daß diese eine chemische Zusammensetzung in Gew.-% vonKohlenstoff max. 0,028Silizium 0,30 bis 0,62Mangan 2,92 bis 3,38Phosphor max. 0,028Schwefel max. 0,004Chrom 24,8 bis 25,8Molybdän 4,1 bis 4,7Nickel 6,9 bis 7,4Wolfram 0,6 bis 0,8Kupfer max. 0,5Stickstoff 0,352 bis 0,385Vanadin 0,05 bis 0,1Aluminium 0,005 bis 0,009
- Duplexlegierung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der errechnete PREN-Faktor einen Wert zwischen 44,5 und 49,5 , vorzugweise zwischen 45,5 und 48,0 aufweist.
- Duplexlegierung gemäß einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß mittels der Wärmebehandlung ein Verhältniswert von Ferrit zu Austenit im Gefüge zwischen 0,42 und 0,8, vorzugsweise zwischen 0,60 und 0,69 eingestellt wird, wobei der Anteil der Sigmaphase und der Nitridanteil und der Anteil an Karbiden unter 5 Gew.-%, vorzugsweise unter 0,5 Gew.-% , ausgebildet ist.
- Duplexlegierung gemäß einem der Ansprüche 1 bis 4, dadurch gekennzeichnet daß ein daraus gebildeter Formteil einen Verformungsgrad von mindestens 2,5fach, insbesondere von mindestens 3,8fach, aufweist, wobei der Verformungsgrad als Summe der Reduktion der Querschnittsfläche zu verstehen ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT136597 | 1997-08-13 | ||
AT1365/97 | 1997-08-13 | ||
AT136597A AT405297B (de) | 1997-08-13 | 1997-08-13 | Duplexlegierung für komplex beanspruchte bauteile |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0897018A1 true EP0897018A1 (de) | 1999-02-17 |
EP0897018B1 EP0897018B1 (de) | 2003-09-03 |
Family
ID=3512308
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19980890210 Expired - Lifetime EP0897018B1 (de) | 1997-08-13 | 1998-07-17 | Duplexstahl mit hoher Festigkeit und Korrosionsbeständigkeit |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0897018B1 (de) |
AT (1) | AT405297B (de) |
DE (1) | DE59809467D1 (de) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6187045B1 (en) * | 1999-02-10 | 2001-02-13 | Thomas K. Fehring | Enhanced biocompatible implants and alloys |
WO2003020994A1 (en) * | 2001-09-02 | 2003-03-13 | Sandvik Ab | Duplex steel alloy |
WO2003020995A1 (en) * | 2001-09-02 | 2003-03-13 | Sandvik Ab | Use of a duplex stainless steel alloy |
WO2004079027A1 (en) * | 2003-03-02 | 2004-09-16 | Sandvik Intellectual Property Ab | Duplex stainless steel alloy for use in seawater applications |
WO2004079028A1 (en) * | 2003-03-02 | 2004-09-16 | Sandvik Intellectual Property Ab | Duplex stainless steel alloy and use thereof |
WO2016118358A1 (en) * | 2015-01-20 | 2016-07-28 | General Electric Company | Corrosion resistant article and methods of making |
EP2947169A4 (de) * | 2013-01-15 | 2016-12-21 | Kobe Steel Ltd | Duplex-edelstahlmaterial und duplex-edelstahlrohr |
CN113584377A (zh) * | 2021-06-22 | 2021-11-02 | 济源市瑞麦特金属材料有限公司 | 一种含氮不锈钢及制备方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0455625A1 (de) * | 1990-05-03 | 1991-11-06 | BÖHLER Edelstahl GmbH | Hochfeste korrosionsbeständige Duplexlegierung |
EP0545753A1 (de) * | 1991-11-11 | 1993-06-09 | Sumitomo Metal Industries, Ltd. | Rostfreies Duplexstahl mit verbesserten Festigkeits- und Korrosionsbeständigkeitseigenschaften |
WO1995000674A1 (en) * | 1993-06-21 | 1995-01-05 | Sandvik Ab | Ferritic-austenitic stainless steel and use of the steel |
EP0683241A2 (de) * | 1994-05-21 | 1995-11-22 | Yong Soo Park | Rostfreies Duplex-Stahl mit guter Korrosionsbeständigkeit |
-
1997
- 1997-08-13 AT AT136597A patent/AT405297B/de not_active IP Right Cessation
-
1998
- 1998-07-17 EP EP19980890210 patent/EP0897018B1/de not_active Expired - Lifetime
- 1998-07-17 DE DE59809467T patent/DE59809467D1/de not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0455625A1 (de) * | 1990-05-03 | 1991-11-06 | BÖHLER Edelstahl GmbH | Hochfeste korrosionsbeständige Duplexlegierung |
EP0545753A1 (de) * | 1991-11-11 | 1993-06-09 | Sumitomo Metal Industries, Ltd. | Rostfreies Duplexstahl mit verbesserten Festigkeits- und Korrosionsbeständigkeitseigenschaften |
WO1995000674A1 (en) * | 1993-06-21 | 1995-01-05 | Sandvik Ab | Ferritic-austenitic stainless steel and use of the steel |
EP0683241A2 (de) * | 1994-05-21 | 1995-11-22 | Yong Soo Park | Rostfreies Duplex-Stahl mit guter Korrosionsbeständigkeit |
Non-Patent Citations (1)
Title |
---|
HORVATH, W. ET AL.: "Microstructures and yield strength of nitrogen alloyed super duplex steels", ACTA MATERIALA, vol. 45, no. 4, 1997, United States, pages 1645 - 1654, XP002086990 * |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6187045B1 (en) * | 1999-02-10 | 2001-02-13 | Thomas K. Fehring | Enhanced biocompatible implants and alloys |
US6773520B1 (en) | 1999-02-10 | 2004-08-10 | University Of North Carolina At Charlotte | Enhanced biocompatible implants and alloys |
WO2003020994A1 (en) * | 2001-09-02 | 2003-03-13 | Sandvik Ab | Duplex steel alloy |
WO2003020995A1 (en) * | 2001-09-02 | 2003-03-13 | Sandvik Ab | Use of a duplex stainless steel alloy |
EA009108B1 (ru) * | 2003-03-02 | 2007-10-26 | Сандвик Интеллекчуал Проперти Аб | Двухфазная коррозионно-стойкая легированная сталь для использования в морской воде |
WO2004079028A1 (en) * | 2003-03-02 | 2004-09-16 | Sandvik Intellectual Property Ab | Duplex stainless steel alloy and use thereof |
WO2004079027A1 (en) * | 2003-03-02 | 2004-09-16 | Sandvik Intellectual Property Ab | Duplex stainless steel alloy for use in seawater applications |
EA009438B1 (ru) * | 2003-03-02 | 2007-12-28 | Сандвик Интеллекчуал Проперти Аб | Двухфазная нержавеющая легированная сталь и её применение |
US7892366B2 (en) | 2003-03-02 | 2011-02-22 | Sandvik Intellectual Property Ab | Duplex stainless steel alloy and use thereof |
EP2947169A4 (de) * | 2013-01-15 | 2016-12-21 | Kobe Steel Ltd | Duplex-edelstahlmaterial und duplex-edelstahlrohr |
WO2016118358A1 (en) * | 2015-01-20 | 2016-07-28 | General Electric Company | Corrosion resistant article and methods of making |
CN107429368A (zh) * | 2015-01-20 | 2017-12-01 | 诺沃皮尼奥内技术股份有限公司 | 耐腐蚀制品及其制造方法 |
CN113584377A (zh) * | 2021-06-22 | 2021-11-02 | 济源市瑞麦特金属材料有限公司 | 一种含氮不锈钢及制备方法 |
Also Published As
Publication number | Publication date |
---|---|
EP0897018B1 (de) | 2003-09-03 |
DE59809467D1 (de) | 2003-10-09 |
AT405297B (de) | 1999-06-25 |
ATA136597A (de) | 1998-11-15 |
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