EP1538232A1 - Korrosionsbeständige, austenitische Stahlregierung - Google Patents
Korrosionsbeständige, austenitische Stahlregierung Download PDFInfo
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- EP1538232A1 EP1538232A1 EP04450211A EP04450211A EP1538232A1 EP 1538232 A1 EP1538232 A1 EP 1538232A1 EP 04450211 A EP04450211 A EP 04450211A EP 04450211 A EP04450211 A EP 04450211A EP 1538232 A1 EP1538232 A1 EP 1538232A1
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- European Patent Office
- Prior art keywords
- steel alloy
- alloy according
- weight
- temperature
- nickel
- Prior art date
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- 238000005260 corrosion Methods 0.000 title description 51
- 230000007797 corrosion Effects 0.000 title description 51
- 229910000831 Steel Inorganic materials 0.000 title description 6
- 239000010959 steel Substances 0.000 title description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 60
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229910000851 Alloy steel Inorganic materials 0.000 claims abstract description 44
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 29
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 25
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 25
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000011733 molybdenum Substances 0.000 claims abstract description 24
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000011572 manganese Substances 0.000 claims abstract description 12
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 12
- 239000010703 silicon Substances 0.000 claims abstract description 12
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 12
- 239000010937 tungsten Substances 0.000 claims abstract description 12
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 11
- 239000010941 cobalt Substances 0.000 claims abstract description 11
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000010949 copper Substances 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 239000011574 phosphorus Substances 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 239000011593 sulfur Substances 0.000 claims abstract description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052802 copper Inorganic materials 0.000 claims abstract description 7
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052796 boron Inorganic materials 0.000 claims abstract description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 claims description 22
- 239000011265 semifinished product Substances 0.000 claims description 17
- 238000005516 engineering process Methods 0.000 claims description 10
- 239000002244 precipitate Substances 0.000 claims description 9
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 8
- 229910052748 manganese Inorganic materials 0.000 claims description 8
- 238000003754 machining Methods 0.000 claims description 7
- 239000010936 titanium Substances 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 6
- 239000010955 niobium Substances 0.000 claims description 6
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 6
- 239000003921 oil Substances 0.000 claims description 6
- 238000003856 thermoforming Methods 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- 229910052758 niobium Inorganic materials 0.000 claims description 5
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims description 5
- 238000001953 recrystallisation Methods 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 238000007514 turning Methods 0.000 claims description 4
- 229910052720 vanadium Inorganic materials 0.000 claims description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 3
- 238000000137 annealing Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 230000036961 partial effect Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- PULIYLGUUXFTAS-UHFFFAOYSA-N [Ti].[Nb].[V] Chemical compound [Ti].[Nb].[V] PULIYLGUUXFTAS-UHFFFAOYSA-N 0.000 claims 1
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 238000005520 cutting process Methods 0.000 claims 1
- 239000011651 chromium Substances 0.000 abstract description 14
- 229910052804 chromium Inorganic materials 0.000 abstract description 10
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 abstract description 4
- 229910045601 alloy Inorganic materials 0.000 description 61
- 239000000956 alloy Substances 0.000 description 61
- 238000005336 cracking Methods 0.000 description 13
- 230000002349 favourable effect Effects 0.000 description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 230000035699 permeability Effects 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005553 drilling Methods 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- 229910003296 Ni-Mo Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- UTPYTEWRMXITIN-YDWXAUTNSA-N 1-methyl-3-[(e)-[(3e)-3-(methylcarbamothioylhydrazinylidene)butan-2-ylidene]amino]thiourea Chemical compound CNC(=S)N\N=C(/C)\C(\C)=N\NC(=S)NC UTPYTEWRMXITIN-YDWXAUTNSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 229910001004 magnetic alloy Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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 by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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 by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
-
- 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
- C22C38/02—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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
- C22C38/18—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
- C22C38/44—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
- C22C38/52—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
- C22C38/18—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
- C21D2261/00—Machining or cutting being involved
-
- 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
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- 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
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
Definitions
- the invention relates to an austenitic, substantially ferrite-free Steel alloy.
- the invention comprises the use of an austenitic, im Essentially ferrite-free steel alloy.
- the invention relates to a process for the preparation of austenitic, substantially ferrite-free components, in particular Boring bars, for oil field technology.
- Austenitic alloys may be essentially ferrite-free, that is to say with a relative magnetic permeability ⁇ r smaller than 1.01. Thus, austenitic alloys can meet the above requirement and therefore be used principally for drill string components.
- a chosen austenitic material Minimum mechanical values Properties, in particular the 0.2% proof strength and tensile strength achieved and the dynamically changing loads occurring during drilling operation has grown, so in addition has a high permanent fatigue strength. Otherwise, for example, drill rods from corresponding Alloys the occurring during use high tensile and Compressive stresses and torsional stresses not or only for withstand a short operating time; undesirable rapid or premature Material failure is the result.
- Austenitic materials for drill string components tend to be high alloyed with nitrogen to high values of yield strength and tensile strength of components such as boring bars.
- alloys are economically favorable which, when solidified under atmospheric pressure to non-porous semi-finished product to lead.
- austenitic alloys are the high nitrogen content because rather rare, and it is consistently a stagnation under increased pressure required to achieve freedom from pores.
- One Melting and solidification under nitrogen pressure may also be necessary to to obtain enough nitrogen in the solidified material, if otherwise a insufficient nitrogen solubility is given.
- austenitic alloys which are suitable for use as Components of drill strings are provided, a good resistance against different types of corrosion.
- a good resistance against different types of corrosion In particular, is a high Resistance to pitting corrosion and stress corrosion cracking especially in chloride-containing media desired.
- Austenitic alloys are known in the art. which in each case meet some of these requirements, namely extensive freedom from ferrite, good mechanical properties, freedom from pores and high Corrosion resistance, meet.
- Another austenitic alloy is from the way already mentioned DE 196 07 828 A1 known.
- objects for the Offshore industry consisting of an austenitic alloy with (in Weight percent) 0.1% carbon, 8% to 15% manganese, 13% to 18% Chromium, 2.5% to 6% molybdenum, 0% to 5% nickel and 0.55% to 1.1% Nitrogen exist.
- Such objects are intended to be high mechanical Characteristics and a higher permanent alternating fatigue strength than objects have according to DE 39 40 438 C1.
- the disadvantage is one on the Alloy composition traceable low nitrogen solubility, why must be melted under pressure and allowed to solidify or even more complex powder metallurgical manufacturing processes are to be used.
- Austenitic alloy is described in AT 407 882 B.
- alloy has a high 0.2% proof stress, high tensile strength and a high permanent fatigue strength.
- Alloys according to AT 407 882 B are conveniently hot worked and at temperatures of 350 ° C. subjected to a second deformation to about 600 ° C.
- the alloys are suitable for a production of boring bars, which under a Drill bits in oil field technology also meet the high requirements in terms of static and dynamic load capacity over long periods in satisfactorily take into account.
- the invention takes on and sets itself the task of an austenitic To specify steel alloy which meltable at atmospheric pressure and to pore-free semi-finished is processed and which in good mechanical Properties, especially at high 0.2% proof stress, high tensile strength and high permanent fatigue strength, at the same time a high resistance both has against stress corrosion cracking as well as pitting corrosion.
- Another object of the invention is to provide uses for an austenitic, im Specify essentially ferrite-free alloy.
- an austenitic, substantially ferrite-free steel alloy is provided, which good mechanical properties, in particular high values of 0.2% Dehngrenze and the tensile strength and which at the same time a high Resistance to stress corrosion cracking and also against Pitting corrosion has.
- a temperature below the recrystallization temperature preferably below 600 ° C, in particular in the range of 300 ° C to 550 ° C.
- Carbon (C) can be contained in a steel alloy according to the invention up to 0.35% by weight. Carbon is an austenite former and works favorable in terms of high mechanical properties. With regard avoidance of carbidic precipitations, especially in larger dimensions, it is preferable to reduce the carbon content to 0.01% by weight. to adjust to 0.06 wt .-%.
- Silicon (Si) is provided in amounts up to 0.75% by weight and is used in the Main thing of a deoxidation of the steel. Higher contents than 0.75% by weight prove to be with regard to an education of intermetallic phases as disadvantageous. Silicon is also a ferrite former and therefore should a Silicon content to a maximum of 0.75 wt .-% be limited. Cheap and therefore It is preferred to use silicon in amounts of from 0.15% by weight to 0.30% by weight. provide, because in this content range sufficiently deoxidizing Effect is given at low contribution of silicon to ferrite formation.
- Manganese (Mn) is present in amounts of more than 19.0% by weight up to 30.0% by weight. intended. This element contributes significantly to a high Nitrogen solubility at. Non-porous materials from an inventive Steel alloys are therefore also when solidifying under atmospheric pressure produced. With regard to a nitrogen solubility of an alloy in the molten state as well as during and after solidification it is preferred to use manganese in contents of more than 20 wt .-%. manganese In addition, the austenite structure stabilizes especially at high degrees of deformation against the formation of Umformmartensit. With respect to a preferably good Corrosion resistance has an upper limit of manganese content 25.5 wt .-% result.
- Chromium (Cr) proves to be in levels of 17.0% by weight or more than necessary for a high corrosion resistance.
- chrome allows one Admixing large amounts of nitrogen.
- Higher contents than 24.0 wt .-% can adversely affect magnetic permeability because of chromium the ferrite-stabilizing elements counts.
- Particularly advantageous are chromium contents from 19.0% to 23.5%, preferably 20.0% to 23.0%. In these Held shows a common consideration of the inclination to the formation of chromium-containing precipitates and resistance to pitting and Stress corrosion cracking an optimum.
- Molybdenum (Mo) is an element used in a steel alloy according to the Invention essential for corrosion resistance in general and Pitting corrosion resistance in particular contributes, with the effect of molybdenum in a content range of more than 1.90 wt .-% by a Presence of nickel is enhanced.
- molybdenum on the one hand is an expensive element and on the other hand at higher levels tends to Formation of intermetallic phases increases, is a molybdenum content of 5.5 wt .-%, in preferred variants of the invention with 5.0 wt .-%, in particular 4.5 % By weight, limited.
- Nickel (Ni) has been found to contribute actively and positively to corrosion resistance in a content range greater than 2.50% to 15.0% by weight and in cooperation with the other alloying elements. In particular, and this is considered to be completely surprising from a professional point of view, in the presence of more than 2.50 wt .-% nickel is given a high stress corrosion cracking resistance. Contrary to the opinion outlined in relevant textbooks, with increasing nickel levels, stress corrosion cracking resistance of chromium-containing austenites in chloride-containing media decreases dramatically and is at a minimum at about 20 wt% (see, eg: AJ Sedriks, Corrosion of Stainless Steels, 2 ed. , John Wiley & Sons Inc., 1996, page 276), a high stress crack corrosion resistance can be achieved in a steel alloy according to the invention even with nickel contents of more than 2.50% to 15.0% by weight in chloride-containing media.
- nickel contents of at least 2.65% by weight, preferably at least 3.6% by weight, in particular 3.8% by weight to 9.8% by weight, nickel.
- Co Co
- Co can be up to 5.0% by weight for substitution of nickel be provided.
- Nickel as explained above, makes a high contribution to Corrosion resistance and is a strong Austenitchanner. In contrast, Although molybdenum also makes a significant contribution to Corrosion resistance, but is a ferrite. Therefore it is favorable if the nickel content is equal to or greater than the molybdenum content. Especially favorable in this context, if a nickel content more than 1.3 times, preferably more than 1.5 times a molybdenum content.
- Nitrogen (N) is required in amounts of at least 0.35 wt% to 1.05 wt% to ensure high strength. Further, nitrogen contributes to the corrosion resistance and is a strong austenite former, therefore, higher contents than 0.40 wt .-%, especially higher than 0.60 wt .-%, are favorable. On the other hand, as nitrogen content increases, nitrogen-containing precipitate formation tends to increase, for example, Cr 2 N. In advantageous variants of the invention, nitrogen content is therefore limited to 0.95% by weight, preferably 0.90% by weight.
- Boron (B) may be present at levels up to 0.005 wt% and favors in particular in a range of 0.0005 wt .-% to 0.004 wt .-% one Thermoformability of the composite material according to the invention.
- Copper (Cu) is tolerable in a steel alloy according to the invention in a content of less than 0.5 wt .-%. At levels of 0.04 wt.% To 0.35 wt.%, Copper proves to be quite advantageous in special drill bit applications, for example when boring bars come in contact with media such as hydrogen sulfide, especially H 2 S. Contents higher than 0.5% by weight promote precipitation formation and are disadvantageous for corrosion resistance.
- S Sulfur
- S Sulfur
- S is provided at levels up to 0.30% by weight. Larger contents as 0.1 wt .-% have a very favorable effect on processing a Steel alloy according to the invention, because a machining is relieved. If, however, pay attention to the highest corrosion resistance of the material, a sulfur content of 0.015 wt .-% is limited.
- the content of phosphorus (P) is less than 0.035 wt .-%.
- a phosphorus content is maximum 0.02 wt .-% limited.
- Vanadium (V), niobium (Nb), titanium (Ti) act in the steel in a sophisticated way and can be present for this purpose individually or in any combination, wherein a cumulative concentration of the elements present at most 0.85% by weight is. With regard to a grain-refining effect and avoidance of coarse precipitates of these strong carbide formers, it is beneficial if a sum concentration of the elements present more than 0.08% by weight and less than 0.45% by weight.
- the elements carry tungsten, Molybdenum, manganese, chromium, vanadium, niobium and titanium positive for solubility from nitrogen.
- the further object of the invention uses for an austenitic, im
- an austenitic, im To indicate essentially ferrite-free alloy is obtained by using a Steel alloy according to the invention as a material for components for the Oilfield technology achieved.
- the Component is a drill string part.
- the further object of the invention is also achieved by using an alloy according to the invention for stressed on train and pressure components, which with corrosive media, in particular a corrosive liquid such as saline Water, come in contact, reached.
- corrosive media in particular a corrosive liquid such as saline Water
- the method according to the invention is achieved by a process for the production of austenitic, substantially ferrite-free components, in particular boring bars, for oilfield technology, first containing a casting (in% by weight) up to 0.35% carbon to 0.75% silicon more than 19.0% to 30.0% manganese more than 17.0% to 24.0% chrome more than 1.90% to 5.5% molybdenum up to 2.0% tungsten up to 15.0% nickel to 5.0% cobalt 0.35% to 1.05% nitrogen to 0.005% boron up to 0.30% sulfur less than 0.5% copper less than 0.05% aluminum less than 0.035% phosphorus, where a sum content of nickel and cobalt is greater than 2.50%, and optionally one or more element (s) selected from the group consisting of vanadium, niobium and titanium, wherein the sum concentration of the selected elements is not more than 0.85 wt .-%, Remaining iron and manufacturing impurities is created, whereupon the casting is deformed into a semi-finished product at a temperature
- the component to be created is a boring bar
- Deformation degrees provide sufficient strength for uses and allow turning or peeling with reduced Tool wear.
- the semi-finished deformed blocks with water Ambient temperature quenched and finally at a temperature of 380 ° C to 420 ° C subjected to a second deformation step, wherein a Deformity 13% to 17%.
- the created objects were examined or further processed to drill rods.
- the alloys listed in Table 1 were examined for pitting corrosion resistance and stress corrosion cracking.
- the determination of the pitting corrosion resistance was carried out by measuring the pitting potential against a standard hydrogen electrode according to ASTM G 61.
- the stress corrosion cracking (SCC) was determined by determining the value of the SCC limit stress according to ATSM G 36.
- the value of the SCC cut-off voltage represents the externally applied maximum test voltage which a test sample can withstand for more than 720 hours in 155% boiling 45% MgCl 2 solution.
- Pitting potential E pit or SCC limit stress can even reach values corresponding to those of high alloyed Cr-Ni-Mo steels and nickel base alloys, with better strength properties as shown in Tables 4 and 5 at the same time. It is particularly favorable with respect to an SCC limit voltage, if a sum of molybdenum and nickel 4.7 wt .-% or more, in particular more than 6 wt .-%, is.
- articles made of the alloys 1 to 7 according to the invention have a relative magnetic permeability of ⁇ r ⁇ 1,005 and at room temperature permanent fatigue strengths of at least 400 MPa at 10 7 load changes.
- an alloy of the invention is optimal also as a material for fasteners or fasteners, such as Screws, nails, bolts or the like components, if this high mechanical loads as well as aggressive environmental conditions are exposed.
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Abstract
Description
bis 0.35 % Kohlenstoff
bis 0.75 % Silicium
mehr als 19.0 % bis 30.0 % Mangan
mehr als 17.0 % bis 24.0 % Chrom
mehr als 1.90 % bis 5.5 % Molybdän
bis 2.0 % Wolfram
bis 15.0 % Nickel
bis 5.0 % Cobalt
0.35 % bis 1.05 % Stickstoff
bis 0.005 % Bor
bis 0.30 % Schwefel
weniger als 0.5 % Kupfer
weniger als 0.05 % Aluminium
weniger als 0.035 % Phosphor,
wobei ein Summengehalt von Nickel und Cobalt größer als 2.50 % ist,
sowie wahlweise ein oder mehrere Element(e) ausgewählt aus der Gruppe bestehend aus Vanadium, Niob und Titan, wobei die Summenkonzentration der gewählten Elemente maximal 0.85 Gew.-% beträgt,
Rest Eisen und herstellungsbedingte Verunreinigungen
erstellt wird, worauf das Gussstück bei einer Temperatur von mehr als 750°C in mehreren Warmverformungsteilschritten zu einem Halbzeug verformt wird,
wobei wahlweise vor dem ersten Teilschritt oder zwischen den Teilschritten ein Homogenisieren des Halbzeuges bei einer Temperatur von mehr als 1150 °C erfolgt, worauf nach dem letzten Warmverformungsteilschritt und einem darauf wahlweise durchgeführten Lösungsglühen des Halbzeuges bei einer Temperatur von mehr als 900 °C das Halbzeug einer verstärkten Abkühlung unterworfen wird und in einem weiteren Verformungsschritt bei einer Temperatur unterhalb der Rekristallisationstemperatur, insbesondere unter 600 °C, verformt wird, wonach aus dem Halbzeug durch spanabhebende Bearbeitung eine Komponente gefertigt wird, erreicht.
| Chemische Zusammensetzungen von Vergleichslegierungen A bis E und erfindungsgemäßen Legierungen 1 bis 7 (Angaben in Gew.-%) | ||||||||||||||||||
| Legierung | C | Si | Mn | P | S | Cr | Mo | Ni | V | W | Cu | Co | Ti | Al | Nb | B | Fe | N |
| A | 0,03 | 0,5 | 19,8 | <0,05 | <0,015 | 13,5 | 0,5 | 1,1 | 0,1 | 0,2 | 0,1 | 0,1 | <0,1 | <0,01 | <0,1 | <0,005 | Rest | 0,30 |
| B | 0,05 | 0,3 | 19,9 | <0,05 | <0,015 | 18,2 | 0,3 | 1,0 | 0,1 | 0,2 | 0,1 | 0,1 | <0,1 | <0,01 | <0,1 | <0,005 | Rest | 0,60 |
| C | 0,04 | 0,2 | 23,6 | <0,05 | <0,015 | 21.4 | 0,3 | 1,6 | 0,1 | 0,2 | 0,1 | 0,1 | <0,1 | <0,01 | <0,1 | <0,005 | Rest | 0,67 |
| D | 0,01 | 0,3 | 2,7 | <0,05 | <0,015 | 27,3 | 3,2 | 29,4 | 0,1 | 0,1 | 0,6 | 0,1 | <0,1 | <0,01 | <0,1 | <0,005 | Rest | 0,29 |
| E | 0,01 | <0,05 | 0,1 | <0,005 | <0,001 | 20,6 | 3,1 | Rest | 0,02 | <0,05 | 1,8 | <0,05 | 2,1 | 0,2 | 0,3 | 0,003 | 27,8 | <0,01 |
| 1 | 0,04 | 0,2 | 19,8 | <0,035 | <0,015 | 18,8 | 1,94 | 3,9 | 0,07 | 0,1 | 0,1 | 0,1 | <0,1 | <0,01 | <0,1 | <0,005 | Rest | 0.62 |
| 2 | 0,04 | 0,2 | 21,4 | <0,035 | <0,015 | 18,5 | 2,13 | 5,8 | 0,10 | 0,1 | 0,1 | 0,1 | <0,1 | <0,01 | <0,1 | <0,005 | Rest | 0,60 |
| 3 | 0,04 | 0,2 | 23,3 | <0,035 | <0,015 | 20,7 | 2,03 | 4,5 | 0,05 | 0,1 | 0,2 | 0,1 | <0,1 | <0,01 | <0,1 | <0,005 | Res | 0,88 |
| 4 | 0,03 | 0,2 | 24,4 | <0,035 | <0,015 | 21,0 | 3,15 | 6,5 | 0,10 | 0,1 | 0,3 | 0,1 | <0,1 | <0,01 | <0,1 | <0,005 | Rest | 0,86 |
| 5 | 0,04 | 0,2 | 25,2 | <0,035 | 0,0020 | 20,9 | 4,11 | 9,3 | 0,03 | 0,1 | 0,1 | 0,1 | <0,1 | <0,01 | <0,1 | <0,005 | Rest | 0,78 |
| 6 | 0,15 | 0,5 | 19,3 | <0,035 | <0,015 | 18,2 | 2,05 | 2,7 | 0,01 | 0,1 | 0,1 | 0.1 | <0,1 | <0,01 | 0,1 | <0,005 | Rest | 0.77 |
| 7 | 0,34 | 0,1 | 22,4 | <0,035 | <0,015 | 17,4 | 2,5 | 4,0 | 0,02 | 0,1 | 0,1 | 0,1 | <0,1 | <0,01 | <0,1 | <0,005 | Rest | 0.52 |
| Lochkorrosionspotential Epit (bezogen jeweils auf eine Standard-Wasserstoffelektrode) von Vergleichslegierungen A bis E und erfindungsgemäßen Legierungen 1 bis 7 | |||
| Legierung | PREN-Wert | Lochkorrosionspotential EPit | |
| Test A (25 °C, 80000 ppm Cl -) | Test B (60°C, synthetisches Meerwasser) | ||
| A | 20,0 | < 0 | < 0 |
| B | 28,8 | 164 | < 0 |
| C | 36,3 | 527 | 49 |
| D | 42,5 | kein Lochfraß | 1142 |
| E | 30,8 | kein Lochfraß | 733 |
| 1 | 35,1 | 558 | 65 |
| 2 | 35,0 | 563 | 77 |
| 3 | 41,3 | kein Lochfraß | 671 |
| 4 | 45,3 | kein Lochfraß | 1091 |
| 5 | 46,9 | kein Lochfraß | 1188 |
| 6 | 37,3 | kein Lochfraß | 645 |
| 7 | 34,0 | kein Lochfraß | 598 |
| Spannungsrisskorrosion(SCC) - Grenzspannung in Magnesiumchlorid (lösungsgeglühter und kaltverformter Zustand der Legierungen) | ||||
| Legierung | Mo-Gehalt [Gew: %] | Ni-Gehalt [Gew.%] | Σ(%Ni + %Mo) [Gew.%] | SCC- Grenzspannung [MPa] |
| A | 0,5 | 1,1 | 1,6 | 250 |
| B | 0,3 | 1,0 | 1,3 | 325 |
| C | 0,3 | 1,6 | 1,9 | 375 |
| D | 3,2 | 29,4 | 32,6 | 550 |
| E | 3,1 | Rest | 47,1 | 850 |
| 1 | 1,94 | 3,9 | 5,8 | 450 |
| 2 | 2,13 | 5,8 | 7,9 | 475 |
| 3 | 2,03 | 4,5 | 6,5 | 500 |
| 4 | 3,15 | 6,5 | 9,7 | 525 |
| 5 | 4,11 | 9,3 | 13,4 | 550 |
| 6 | 2,05 | 2,7 | 4,7 | 450 |
| 7 | 2,5 | 4,0 | 6,5 | 475 |
| Mechanische Eigenschaften und Komgröße von Vergleichslegierungen A bis E und erfindungsgemäßen Legierungen 1 bis 7 im lösungsgeglühten Zustand | |||||
| Legierung | Mechanische Eigenschaften | ASTM- Korn- größe | |||
| 0,2%- Dehngrenze Rp0,2 [MPa] | Zugfestigkeit Rm [MPa] | Bruchdehnung A5 [%] | Kerbschlagarbeit A v [J] | ||
| A | 405 | 725 | 55 | 305 | 3-6 |
| B | 515 | 845 | 52 | 350 | |
| C | 599 | 942 | 48 | 325 | |
| D | 445 | 790 | 63 | 390 | |
| E | 310 | 672 | 75 | 335 | |
| 1 | 507 | 843 | 50 | 289 | 4-5 |
| 2 | 497 | 829 | 50 | 293 | |
| 3 | 598 | 944 | 51 | 303 | |
| 4 | 571 | 928 | 53 | 301 | |
| 5 | 564 | 903 | 54 | 295 | |
| 6 | 582 | 930 | 52 | 355 | |
| 7 | 550 | 925 | 54 | 378 |
| Mechanische Eigenschaften von Vergleichslegierungen A bis E und erfindungsgemäßen Legierungen 1 bis 7 im lösungsgeglühten und kaltverformten Zustand | |||||
| Legierung | Mechanische Eigenschaften | Kaltver- formungsgrad [%] | |||
| 0,2%- Dehngrenze Rp0,2 [MPa] | Zugfestigkeit R m [MPa] | Bruchdehnung A 5 [%] | Kerbschlag- arbeit A v [J] | ||
| A | 825 | 915 | 30 | 225 | 10-30 |
| B | 1015 | 1120 | 25 | 190 | |
| C | 1120 | 1229 | 23 | 145 | |
| D | 982 | 1089 | 21 | 210 | 20-30 |
| E | 1015 | 1190 | 23 | 70 | nicht bestimmt |
| 1 | 1021 | 1128 | 24 | 195 | 13- 17 |
| 2 | 996 | 1097 | 24 | 183 | |
| 3 | 1117 | 1230 | 22 | 147 | |
| 4 | 1103 | 1215 | 22 | 152 | |
| 5 | 1077 | 1192 | 23 | 156 | |
| 6 | 1112 | 1226 | 22 | 165 | |
| 7 | 1065 | 1195 | 23 | 188 |
Claims (30)
- Austenitische, im Wesentlichen ferritfreie Stahllegierung enthaltend (in Gew.-%)
bis 0.35 % Kohlenstoff
bis 0.75 % Silicium
mehr als 19.0 % bis 30.0 % Mangan
mehr als 17.0 % bis 24.0 % Chrom
mehr als 1.90 % bis 5.5 % Molybdän
bis 2.0 % Wolfram
bis 15.0 % Nickel
bis 5.0 % Cobalt
0.35 % bis 1.05 % Stickstoff
bis 0.005 % Bor
bis 0.30 % Schwefel
weniger als 0.5 % Kupfer
weniger als 0.05 % Aluminium
weniger als 0.035 % Phosphor,
wobei ein Summengehalt von Nickel und Cobalt größer als 2.50 % ist,
sowie wahlweise ein oder mehrere Element(e) ausgewählt aus der Gruppe bestehend aus Vanadium, Niob und Titan, wobei die Summenkonzentration der gewählten Elemente maximal 0.85 Gew.-% beträgt,
Rest Eisen und herstellungsbedingte Verunreinigungen. - Stahllegierung nach Anspruch 1, enthaltend (in Gew.-%) zumindest 2.65 %, vorzugsweise zumindest 3.6 %, insbesondere 3.8 % bis 9.8 %, Nickel.
- Stahllegierung nach Anspruch 1 oder 2, enthaltend (in Gew.-%) weniger als 0.2 % Cobalt.
- Stahllegierung nach einem der Ansprüche 1 bis 3, enthaltend (in Gew.-%) 2.05 % bis 5.0 %, vorzugsweise 2.5 % bis 4.5 %, Molybdän.
- Stahllegierung nach einem der Ansprüche 1 bis 4, enthaltend (in Gew.-%) mehr als 20.0 % bis 25.5 % Mangan.
- Stahlegierung nach einem der Ansprüche 1 bis 5, enthaltend (in Gew.-%) 19.0 % bis 23.5 %, vorzugsweise 20.0 % bis 23.0 %, Chrom.
- Stahllegierung nach einem der Ansprüche 1 bis 6, enthaltend (in Gew.-%) 0.15 % bis 0.30 % Silicium.
- Stahllegierung nach einem der Ansprüche 1 bis 7, enthaltend (in Gew.-%) 0.01 % bis 0.06 % Kohlenstoff.
- Stahllegierung nach einem der Ansprüche 1 bis 8, enthaltend (in Gew.-%) 0.40 % bis 0.95 %, vorzugsweise 0.60 % bis 0.90 % Stickstoff.
- Stahllegierung nach einem der Ansprüche 1 bis 9, wobei das Verhältnis der Gewichtsanteile von Stickstoff zu Kohlenstoff größer als 15 ist.
- Stahllegierung nach einem der Ansprüche 1 bis 10, enthaltend (in Gew.-%) 0.04 % bis 0.35 % Kupfer.
- Stahllegierung nach einem der Ansprüche 1 bis 11, enthaltend (in Gew.-%) 0.0005 % bis 0.004 % Bor.
- Stahllegierung nach einem der Ansprüche 1 bis 12 mit der Maßgabe, dass der Nickelgehalt gleich oder größer als der Molybdängehalt ist.
- Stahllegierung nach einem der Ansprüche 1 bis 13, wobei der Nickelgehalt mehr als das 1.3-fache, vorzugsweise mehr als das 1.5-fache, des Molybdängehaltes beträgt.
- Stahllegierung nach einem der Ansprüche 1 bis 14, welche zumindest zwei Elemente ausgewählt aus der Gruppe bestehend aus
Vanadium
Niob
Titan,
enthält, wobei der Gewichtsanteil dieser Elemente in Summe mehr als 0.08 Gew.-% und weniger als 0.45 Gew.-% beträgt. - Stahllegierung nach einem der Ansprüche 1 bis 15, enthaltend (in Gew.-%) maximal 0.015 % Schwefel.
- Stahllegierung nach einem der Ansprüche 1 bis 16, enthaltend (in Gew.-%) maximal 0.02 % Phosphor.
- Stahllegierung nach einem der Ansprüche 1 bis 17, enthaltend Molybdän und Wolfram, wobei der Summengehalt X (in Gew.-%) berechnet nach X = (%Molybdän) + 0.5*(% Wolfram) größer als 2 und kleiner als 5.5 ist.
- Stahllegierung nach einem der Ansprüche 1 bis 18, mit einer Dauerwechselfestigkeit bei Raumtemperatur von größer als 400 MPa bei 107 Lastwechsel.
- Stahllegierung nach einem der Ansprüche 1 bis 19, welche im Wesentlichen frei von stickstoffhältigen und/oder karbidischen Ausscheidungen vorliegt.
- Stahllegierung nach einem der Ansprüche 1 bis 20, welche bei einer Temperatur von mehr als 750 °C warmverformt, danach wahlweise lösungsgeglüht und anschließend bei einer Temperatur unterhalb der Rekristallisationstemperatur, vorzugsweise unterhalb von 600 °C, insbesondere im Temperaturbereich von 300 °C bis 550°C, verformt ist.
- Stahllegierung nach einem der Ansprüche 1 bis 21, welche in Form einer Komponente für die Ölfeldtechnik, insbesondere in Form eines Bohrstrangteils, vorliegt.
- Verwendung einer Stahllegierung nach einem der Ansprüche 1 bis 21 als Werkstoff für Komponenten für die Ölfeldtechnik.
- Verwendung einer Stahllegierung nach Anspruch 23, wobei die Komponente ein Bohrstrangteil ist.
- Verwendung einer Stahllegierung nach einem der Ansprüche 1 bis 21 für auf Zug und Druck beanspruchte Bauteile, welche mit korrosiven Medien, insbesondere einer korrosiven Flüssigkeit wie salzhältiges Wasser, in Kontakt kommen.
- Verfahren zur Herstellung von austenitischen, im Wesentlichen ferritfreien Komponenten, insbesondere Bohrstangen, für die Ölfeldtechnik, wobei zuerst ein Gussstück enthaltend (in Gew.-%)
bis 0.35 % Kohlenstoff
bis 0.75 % Silicium
mehr als 19.0 % bis 30.0 % Mangan
mehr als 17.0 % bis 24.0 % Chrom
mehr als 1.90 % bis 5.5 % Molybdän
bis 2.0 % Wolfram
bis 15.0 % Nickel
bis 5.0 % Cobalt
0.35 % bis 1.05 % Stickstoff
bis 0.005 % Bor
bis 0.30 % Schwefel
weniger als 0.5 % Kupfer
weniger als 0.05 % Aluminium
weniger als 0.035 % Phosphor,
wobei ein Summengehalt von Nickel und Cobalt größer als 2.50 % ist,
sowie wahlweise ein oder mehrere Element(e) ausgewählt aus der Gruppe bestehend aus Vanadium, Niob und Titan, wobei die Summenkonzentration der gewählten Elemente maximal 0.85 Gew.-% beträgt,
Rest Eisen und herstellungsbedingte Verunreinigungen
erstellt wird,
worauf das Gussstück bei einer Temperatur von mehr als 750°C in mehreren Warmverformungsteilschritten zu einem Halbzeug verformt wird, wobei wahlweise vor dem ersten Teilschritt oder zwischen den Teilschritten ein Homogenisieren des Halbzeuges bei einer Temperatur von mehr als 1150 °C erfolgt, worauf nach dem letzten Warmverformungsteilschritt und einem darauf wahlweise durchgeführten Lösungsglühen des Halbzeuges bei einer Temperatur von mehr als 900 °C das Halbzeug einer verstärkten Abkühlung unterworfen wird und in einem weiteren Verformungsschritt bei einer Temperatur unterhalb der Rekristallisationstemperatur, insbesondere unter 600 °C, verformt wird, wonach aus dem Halbzeug durch spanabhebende Bearbeitung eine Komponente gefertigt wird. - Verfahren nach Anspruch 26, wobei der Verformungsschritt nach einer verstärkten Abkühlung bei einer Temperatur des Halbzeuges von über 350°C durchgeführt wird.
- Verfahren nach Anspruch 26 oder 27, wobei das Halbzeug eine Stange ist und diese im zweiten Verformungsschritt mit einem Verformungsgrad von 10 % bis 20 % verformt wird.
- Verfahren nach einem der Ansprüche 26 bis 28, wobei das erstellte Gussstück mittels Elektroschlacke-Umschmelz-Verfahren umgeschmolzen wird.
- Verfahren nach einem der Ansprüche 26 bis 29, wobei die spanabhebende Bearbeitung ein Drehen und/oder Schälen umfasst.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0193803A AT412727B (de) | 2003-12-03 | 2003-12-03 | Korrosionsbeständige, austenitische stahllegierung |
| AT19382003 | 2003-12-03 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1538232A1 true EP1538232A1 (de) | 2005-06-08 |
| EP1538232B1 EP1538232B1 (de) | 2007-01-03 |
Family
ID=33315002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04450211A Expired - Lifetime EP1538232B1 (de) | 2003-12-03 | 2004-11-17 | Korrosionsbeständige, austenitische Stahllegierung |
Country Status (7)
| Country | Link |
|---|---|
| US (3) | US7708841B2 (de) |
| EP (1) | EP1538232B1 (de) |
| AT (2) | AT412727B (de) |
| CA (1) | CA2488965C (de) |
| DE (1) | DE502004002524D1 (de) |
| ES (1) | ES2280936T3 (de) |
| NO (1) | NO340359B1 (de) |
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|---|---|---|---|---|
| WO2008127262A3 (en) * | 2006-06-23 | 2009-02-19 | Jorgensen Forge Corp | Austenitic paramagnetic corrosion resistant steel |
| EP2248919B1 (de) | 2009-04-27 | 2015-10-21 | Daido Tokushuko Kabushiki Kaisha | Hoch korrosionsbeständiger, hochfester und nichtmagnetischer Edelstahl |
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| US8652400B2 (en) | 2011-06-01 | 2014-02-18 | Ati Properties, Inc. | Thermo-mechanical processing of nickel-base alloys |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008127262A3 (en) * | 2006-06-23 | 2009-02-19 | Jorgensen Forge Corp | Austenitic paramagnetic corrosion resistant steel |
| EP2248919B1 (de) | 2009-04-27 | 2015-10-21 | Daido Tokushuko Kabushiki Kaisha | Hoch korrosionsbeständiger, hochfester und nichtmagnetischer Edelstahl |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2488965A1 (en) | 2005-06-03 |
| US20050145308A1 (en) | 2005-07-07 |
| US7708841B2 (en) | 2010-05-04 |
| CA2488965C (en) | 2013-04-09 |
| ATE350505T1 (de) | 2007-01-15 |
| NO20045271L (no) | 2005-06-06 |
| AT412727B (de) | 2005-06-27 |
| ATA19382003A (de) | 2004-11-15 |
| EP1538232B1 (de) | 2007-01-03 |
| ES2280936T3 (es) | 2007-09-16 |
| US20110253262A1 (en) | 2011-10-20 |
| US8454765B2 (en) | 2013-06-04 |
| US7947136B2 (en) | 2011-05-24 |
| DE502004002524D1 (de) | 2007-02-15 |
| NO340359B1 (no) | 2017-04-10 |
| US20100170596A1 (en) | 2010-07-08 |
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