EP1565589B1 - Use of a steel alloy as a material for producing pipes for motor vehicles - Google Patents
Use of a steel alloy as a material for producing pipes for motor vehicles Download PDFInfo
- Publication number
- EP1565589B1 EP1565589B1 EP03782109A EP03782109A EP1565589B1 EP 1565589 B1 EP1565589 B1 EP 1565589B1 EP 03782109 A EP03782109 A EP 03782109A EP 03782109 A EP03782109 A EP 03782109A EP 1565589 B1 EP1565589 B1 EP 1565589B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- steel alloy
- motor vehicles
- max
- pipes
- pipelines
- 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.)
- Expired - Lifetime
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- 239000000463 material Substances 0.000 title claims description 17
- 229910000851 Alloy steel Inorganic materials 0.000 title claims description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000011651 chromium Substances 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000011572 manganese Substances 0.000 claims description 4
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 239000011733 molybdenum Substances 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 239000011574 phosphorus Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 239000005864 Sulphur Substances 0.000 claims 1
- 239000004411 aluminium Substances 0.000 claims 1
- 238000005476 soldering Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 150000004767 nitrides Chemical class 0.000 description 2
- 238000004881 precipitation hardening Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 229910000919 Air-hardening tool steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 231100000989 no adverse effect Toxicity 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium 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
- C22C38/22—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
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
Definitions
- the soldering is done with the addition of pure copper solder usually in a continuous soldering furnace at a temperature of 1083 ° C.
- the high heating during soldering can be at the known material RSt-34.2 lead to coarse grain formation and the decline in fatigue strength, which adversely affects the mechanical properties of the material used. Damage has already occurred to such pipelines in the area of the solder joints in the past. Of course, such defects are in no way acceptable in pipelines. Therefore, the reduced by soldering strength of the material was compensated by the use of pipes of greater wall thickness.
- EP 0 753 597 A2 relates to the use of a steel alloy, expressed as a percentage by weight, of carbon (C) 0.12% - 0.25%, silicon (Si) 0.10% - 0.40%, manganese (Mn) 1, 30% - 2.00%, phosphorus (P) max. 0.025%, sulfur (S) max. 0.025%, chromium (Cr) 1.60% - 2.50%, molybdenum (Mo) 0.40% - 1.00%, aluminum (Al) 0.010% - 0.050%, remainder iron including fouling-related impurities.
- This material is characterized by a good deformability and its toughness behavior. An additional fee is not required.
- the material Since the material is weldable, it can be used in addition to the use of seamless tubes for the production of longitudinally welded pipes, which are better suited for the intended use as a starting material for stabilizers.
- very high demands are placed on the forming capacity of the material, for example for attaching compression flanging.
- the formability of said alloy is not always sufficient for these applications.
- the present invention seeks to show a steel alloy as a material for the production of pipelines for motor vehicles, which, while meeting the safety requirements and ferügungsischen conditions allows for less material use.
- the main advantage of this steel alloy is that the material undergoes a significant increase in strength in the downstream soldering process, so that the wall thickness of the pipelines can be lowered considerably with regard to the internal pressure loads. This advantage is due to the temperature level of the soldering process. The high soldering temperature has no adverse effect on the steel alloy used.
- the tubes may be subjected to a suitable heat treatment instead of the brazing process.
- the pipes can be annealed at temperatures above the transformation point Ac3 and subsequently tempered with a low cooling rate comparable to an air cooling.
- the assembly of the individual pipeline sections may in this case be e.g. done by screwing.
- this air-hardening steel alloy also allows the use of manufacturing technology favorable welding methods, such as MAG or laser beam welding.
- MAG or laser beam welding When using a suitable filler material by the air hardening, the weld seams have a favorable hardened structure, with only slight or no solidification fluctuations, in particular no strength drops, occurring in the transition region to the base material.
- the favorable increase in hardness in the heat affected zone is due to the precipitation hardening occurring therein. Due to the precipitation hardening, the pipes in the base material would break and not in the area of the weld seam. However, unlike the connection area of a holder, no crack-inducing voltage peaks occur in the base material, so the risk of damage when using the claimed steel alloy is considerably reduced.
- the air hardening is preferably carried out in a continuous furnace under protective gas at a temperature of 950 ° C ⁇ 15 ° C.
- the steel alloy used can in principle contain small proportions of nickel up to a maximum of 0.20%. This proportion results from the use of steel scrap in the melting of the steel alloy. The same applies to copper, which occurs as a result of the scrap insert.
- the proportion by weight of copper is limited to a maximum of 0.20% by weight.
- vanadium (-carbo) nitrides which have pronounced positive properties on the steel alloy used and for the inventive use of the steel alloy.
- the vanadium (-carbo) nitrides formed by the targeted addition of nitrogen contribute to precipitation strengthening and grain refining. It has been found that when mass fractions of nitrogen in a range of 0.005% and 0.05% on the one hand sufficient carbonitrides are formed and on the other hand, the nitrogen is sufficiently bound by vanadium.
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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 Articles (AREA)
Description
Im Serienfahrzeugbau bestehen einbaufertige metallische Rohrleitungen für Fluide, wie Kühlwasser, Kraftstoff, Hydraulikflüssigkeiten, in der Regel aus einem korrosionsgeschützten Stahlrohr. Die Rohrleitungen sind entweder über separate Halterungen fixiert im Kraftfahrzeug, teilweise sind aber auch Halterungen und Anschlussstutzen unmittelbar an die metallischen Rohrleitungen angelötet.In series vehicle construction, ready-to-install metallic pipelines for fluids, such as cooling water, fuel, hydraulic fluids, usually consist of a corrosion-protected steel pipe. The pipes are either via separate brackets fixed in the vehicle, but some brackets and nozzles are soldered directly to the metallic pipes.
Gegenwärtig werden Rohrleitungen für Kühlwasser und Hydraulikflüssigkeiten in der Automobiltechnik zumeist aus Rohren aus dem Material RSt-34.2 (Streckgrenze RP0.2 = 235 N/mm2) mit Wanddicken von ca. 0,7 mm bis 1,0 mm hergestellt. Nach dem Biegen der zunächst geraden Rohre in den gewünschten Leitungsverlauf werden Halterungen angelötet. Die Lötung erfolgt unter Zugabe von Reinkupferlot üblicherweise in einem Durchlauflötofen bei einer Temperatur von 1083 °C. Die hohe Erwärmung beim Löten kann bei dem bekannten Werkstoff RSt-34.2 zur Grobkornbildung und zum Rückgang der Dauerschwingfestigkeit führen, was sich nachteilig auf die mechanischen Eigenschaften des eingesetzten Werkstoffs auswirkt. In der Vergangenheit sind bereits Schadensfälle an derartigen Rohrleitungen im Bereich der Lötstellen aufgetreten. Derartige Mängel sind bei Rohrleitungen natürlich in keiner Weise akzeptabel. Daher wurde die durch Lötung verringerte Festigkeit des Werkstoffs durch die Verwendung von Rohrleitungen größerer Wanddicke kompensiert.At present, pipelines for cooling water and hydraulic fluids in the automotive industry are usually made of pipes made of the material RSt-34.2 (yield strength R P0.2 = 235 N / mm 2 ) with wall thicknesses of about 0.7 mm to 1.0 mm. After bending the initially straight pipes in the desired line course brackets are soldered. The soldering is done with the addition of pure copper solder usually in a continuous soldering furnace at a temperature of 1083 ° C. The high heating during soldering can be at the known material RSt-34.2 lead to coarse grain formation and the decline in fatigue strength, which adversely affects the mechanical properties of the material used. Damage has already occurred to such pipelines in the area of the solder joints in the past. Of course, such defects are in no way acceptable in pipelines. Therefore, the reduced by soldering strength of the material was compensated by the use of pipes of greater wall thickness.
In der Automobiltechnik besteht jedoch nicht zuletzt aus Gründen der Kraftstoffersparnis die stete Notwendigkeit, die Gesamtmasse des Kraftfahrzeugs zu reduzieren. Aus den voran genannten Gründen war dies aus sicherheitstechnischen Gründen bei gelöteten fluidleitenden Rohrleitungen aus RSt-34.2 bislang nicht möglich.In automotive engineering, however, not least for reasons of fuel economy, there is a constant need to reduce the total mass of the motor vehicle. For safety reasons, this was previously not possible with brazed fluid-conducting pipes made from RSt-34.2.
Die EP 0 753 597 A2 betrifft die Verwendung einer Stahllegierung, die in Gewichtsprozent ausgedrückt besteht aus Kohlenstoff (C) 0,12% - 0,25%, Silizium (Si) 0.10% - 0,40%, Mangan (Mn) 1,30% - 2,00%, Phosphor (P) max. 0.025%, Schwefel (S) max. 0,025%, Chrom (Cr) 1,60% - 2,50%, Molybdän (Mo) 0,40% - 1,00%, Aluminium (Al) 0,010% - 0,050%, Rest Eisen einschließlich erschrnelzungsbedingter Verunreinigungen. Dieser Werkstoff zeichnet sich durch eine gute Verformbarkeit und sein Zähigkeitsverhalten aus. Eine zusätzliche Vergütung ist nicht erforderlich. Da der Werkstoff schweißbar ist, kann er neben der Verwendung für nahtlose Rohre auch zur Herstellung von Längsnahtgeschweißten Rohren eingesetzt werden, die für den vorgesehenen Verwendungszweck als Ausgangsprodukt für Stabilisatoren besser geeignet sind. Insbesondere bei der Herstellung von dünnwandigen fluidleitenden Rohrleitungen, z.B. für Hydraulikflüssigkeiten, Kraftstoff und Kühlwasser werden jedoch sehr hohe Ansprüche an das Umformvermögen des Werkstoffs gestellt, beispielsweise für das Anbringen von Stauchbördeln. Das Umformvermögen der genannten Legierung ist für diese Anwendungsfälle nicht in jedem Fall ausreichend.EP 0 753 597 A2 relates to the use of a steel alloy, expressed as a percentage by weight, of carbon (C) 0.12% - 0.25%, silicon (Si) 0.10% - 0.40%, manganese (Mn) 1, 30% - 2.00%, phosphorus (P) max. 0.025%, sulfur (S) max. 0.025%, chromium (Cr) 1.60% - 2.50%, molybdenum (Mo) 0.40% - 1.00%, aluminum (Al) 0.010% - 0.050%, remainder iron including fouling-related impurities. This material is characterized by a good deformability and its toughness behavior. An additional fee is not required. Since the material is weldable, it can be used in addition to the use of seamless tubes for the production of longitudinally welded pipes, which are better suited for the intended use as a starting material for stabilizers. However, in particular in the production of thin-walled fluid-conducting pipelines, eg for hydraulic fluids, fuel and cooling water, very high demands are placed on the forming capacity of the material, for example for attaching compression flanging. The formability of said alloy is not always sufficient for these applications.
Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, eine Stahllegierung als Werkstoff zur Herstellung von Rohrleitungen für Kraftfahrzeuge aufzuzeigen, welche , unter Erfüllung der sicherheitstechnischen Voraussetzungen und ferügungstechnischen Bedingungen einen geringeren Materialeinsatz zulässt.Proceeding from this, the present invention seeks to show a steel alloy as a material for the production of pipelines for motor vehicles, which, while meeting the safety requirements and ferügungstechnischen conditions allows for less material use.
Die Aufgabe wird durch die Verwendung einer Stahllegierung mit den Merkmalen des Patentanspruchs 1 gelöst.The object is achieved by the use of a steel alloy having the features of patent claim 1.
Der wesentliche Vorteil dieser Stahllegierung ist, dass der Werkstoff im nachgeschalteten Lötprozess eine deutliche Festigkeitssteigerung erfährt, so dass die Wanddicke der Rohrleitungen im Hinblick auf die Innendruckbelastungen erheblich abgesenkt werden kann. Dieser Vorteil ist auf das Temperaturniveau des Lötprozesses zurückzuführen. Die hohe Löttemperatur hat auf die verwendete Stahllegierung keine nachteiligen Auswirkungen.The main advantage of this steel alloy is that the material undergoes a significant increase in strength in the downstream soldering process, so that the wall thickness of the pipelines can be lowered considerably with regard to the internal pressure loads. This advantage is due to the temperature level of the soldering process. The high soldering temperature has no adverse effect on the steel alloy used.
Alternativ können die Rohrleitungen nach der Umformung anstelle des Lötprozesses einer geeigneten Wärmebehandlung unterzogen werden. Hierzu können die Rohrleitungen bei Temperaturen oberhalb des Umwandlungspunkts Ac3 geglüht und nachfolgend mit geringer Abkühlgeschwindigkeit vergleichbar einer Luftabkühlung vergütet werden. Der Zusammenbau der einzelnen Rohrleitungsabschnitte kann in diesem Fall z.B. durch Verschraubungen erfolgen.Alternatively, after forming, the tubes may be subjected to a suitable heat treatment instead of the brazing process. For this purpose, the pipes can be annealed at temperatures above the transformation point Ac3 and subsequently tempered with a low cooling rate comparable to an air cooling. The assembly of the individual pipeline sections may in this case be e.g. done by screwing.
Die Verwendung dieser lufthärtenden Stahllegierung ermöglicht auch den Einsatz von fertigungstechnisch günstigen Schweißverfahren, wie dem MAG- oder Laserstrahlschweißen. Die Schweißnähte besitzen bei Verwendung eines geeigneten Schweißzusatzwerkstoffs durch die Lufthärtung ein günstiges Härtegefüge, wobei im Übergangsbereich zum Grundmaterial nur geringe bzw. keine Festigungsschwankungen, insbesondere keine Festigkeitssenken, auftreten. Die günstige Härtesteigerung in der Wärmeeinflusszone ist auf die hierin stattfindende Ausscheidungshärtung zurückzuführen. Bedingt durch die Ausscheidungshärtung würden die Rohrleitungen im Grundwerkstoff reißen und nicht im Bereich der Schweißnaht. Da im Grundwerkstoff im Unterschied zum Anbindungsbereich einer Halterung jedoch keine rissinduzierenden Spannungsspitzen auftreten, ist das Schadensrisiko bei Verwendung der beanspruchten Stahllegierung erheblich herabgesetzt.The use of this air-hardening steel alloy also allows the use of manufacturing technology favorable welding methods, such as MAG or laser beam welding. When using a suitable filler material by the air hardening, the weld seams have a favorable hardened structure, with only slight or no solidification fluctuations, in particular no strength drops, occurring in the transition region to the base material. The favorable increase in hardness in the heat affected zone is due to the precipitation hardening occurring therein. Due to the precipitation hardening, the pipes in the base material would break and not in the area of the weld seam. However, unlike the connection area of a holder, no crack-inducing voltage peaks occur in the base material, so the risk of damage when using the claimed steel alloy is considerably reduced.
Grundsätzlich ist nach dem Schweißen keine weitere Wärmebehandlung erforderlich. Bei erhöhten Anforderungen an die Dauerschwingfestigkeit der Rohrleitungen kann eine Steigerung durch eine nachfolgende Anlasswärmebehandlung bei 600 °C bis 660 °C zur Vergütung des Werkstoffs erreicht werden.Basically, no further heat treatment is required after welding. Increased demands on the fatigue strength of the pipelines may result in an increase by a subsequent tempering heat treatment at 600 ° C to 660 ° C to compensate for the material.
Fertigungstechnisch ist es von Vorteil, wenn die verwendete Stahllegierung für die Umformvorgänge, insbesondere für das Biegen, Bördeln, Aufweiten und Stauchen, weichgeglüht ist, um auf diese Weise auch enge Biegeradien zu realisieren. Im Anschluss erfolgt dann das Anlöten von Halterungen und Anschlussstutzen im Durchlauflötofen mit dem sich daran anschließenden Abkühlprozess an Luft oder unter Schutzgas zur Festigkeitserhöhung (Lufthär tung).Manufacturing technology, it is advantageous if the steel alloy used for the forming operations, especially for bending, flanging, widening and upsetting, is annealed to realize in this way, even tight bending radii. Subsequently, the brazing of brackets and connecting pieces in the continuous soldering furnace with the subsequent cooling process takes place in air or under protective gas to increase the strength (air hardening).
Die Verwendung der Stahllegierung zur Herstellung von Rohrleitungen von Kraftfahrzeugen ermöglicht es, Rohrleitungen mit geringeren Wanddicken vorzusehen, die aufgrund einer durch Luftaushärtung erlangten höheren Festigkeit bei einer Streckgrenze Rp 0,2 > 700N/mm2 insbesondere eine erheblich höhere Schwell- und Schwingfestigkeit besitzen.The use of the steel alloy for the production of motor vehicle pipelines makes it possible to provide pipelines with smaller wall thicknesses which, in particular, have considerably higher resistance to swelling and vibration due to a higher strength obtained by air hardening at a yield strength Rp 0.2> 700N / mm 2 .
Die Lufthärtung erfolgt vorzugsweise im Durchlaufofen unter Schutzgas bei einer Temperatur von 950 °C ± 15 °C. Die verwendete Stahllegierung kann grundsätzlich geringe Nickel-Anteile bis maximal 0,20 % enthalten. Dieser Anteil resultiert aus dem Einsatz von Stahlschrott bei der Erschmelzung der Stahllegierung. Gleiches gilt für Kupfer, welches infolge des Schrotteinsatzes auftritt. Auch der Gewichtsanteil von Kupfer ist auf maximal 0,20 Gew.% begrenzt.The air hardening is preferably carried out in a continuous furnace under protective gas at a temperature of 950 ° C ± 15 ° C. The steel alloy used can in principle contain small proportions of nickel up to a maximum of 0.20%. This proportion results from the use of steel scrap in the melting of the steel alloy. The same applies to copper, which occurs as a result of the scrap insert. The proportion by weight of copper is limited to a maximum of 0.20% by weight.
Es ist bekannt, dass geringste Stickstoffgehalte nachhaltig die mechanischen Eigenschaften eines Stahls schädigen, Streckgrenze und Festigkeit erhöhen, das Verformungsvermögen und die Kerbschlagzähigkeit stark herabsetzen sowie gleichzeitig eine alternde Wirkung auf den Stahl besitzen. Im Rahmen der Erfindung hat sich herausgestellt, dass die gezielte Zugabe von Stickstoff zur Bildung von Vanadium(-carbo)-Nitriden führt, die ausgesprochen positive Eigenschaften auf die verwendete Stahllegierung und für die erfindungsgemäße Verwendung der Stahllegierung haben. Die durch gezielte Zugabe von Stickstoff gebildeten Vanadium(-carbo)-Nitride leisten einen Beitrag zur Ausscheidungsverfestigung und Kornfeinung. Dabei hat sich gezeigt, dass bei Massenanteilen des Stickstoffs in einem Bereich von 0,005 % und 0,05 % einerseits genügend Carbonitride gebildet werden und andererseits der Stickstoff hinreichend durch Vanadium gebunden wird.It is known that the lowest nitrogen contents sustainably damage the mechanical properties of a steel, increase yield strength and strength, greatly reduce the deformability and the notched impact strength and at the same time have an aging effect on the steel. In the context of the invention it has been found that the targeted addition of nitrogen leads to the formation of vanadium (-carbo) nitrides, which have pronounced positive properties on the steel alloy used and for the inventive use of the steel alloy. The vanadium (-carbo) nitrides formed by the targeted addition of nitrogen contribute to precipitation strengthening and grain refining. It has been found that when mass fractions of nitrogen in a range of 0.005% and 0.05% on the one hand sufficient carbonitrides are formed and on the other hand, the nitrogen is sufficiently bound by vanadium.
Claims (1)
- Use of a steel alloy which consists of, by mass,
0.09 - 0.12% of carbon (C),
0.15 - 0.30% of silicon (Si),
1.45 - 1.60% of manganese (Mn),
max. 0.015% of phosphorus (P),
max. 0.011% of sulphur (S),
1.25 - 1.50% of chromium (Cr),
0.40 - 0.60% of molybdenum (Mo),
0.020 - 0.060% of aluminium (Al),
0.12 - 0.20% of vanadium (V),
0.005 - 0.05% of nitrogen (N),
max. 0.20% of copper (Cu),
max. 0.20% of nickel (Ni)
remainder iron and standard impurities, as a material for producing air-hardened, fluid-carrying pipelines for motor vehicles.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2002155260 DE10255260A1 (en) | 2002-11-27 | 2002-11-27 | Use of a steel alloy as a material for the production of pipelines for motor vehicles |
| DE10255260 | 2002-11-27 | ||
| PCT/DE2003/003927 WO2004048629A1 (en) | 2002-11-27 | 2003-11-26 | Use of a steel alloy as a material for producing pipes for motor vehicles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1565589A1 EP1565589A1 (en) | 2005-08-24 |
| EP1565589B1 true EP1565589B1 (en) | 2006-03-15 |
Family
ID=32308739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP03782109A Expired - Lifetime EP1565589B1 (en) | 2002-11-27 | 2003-11-26 | Use of a steel alloy as a material for producing pipes for motor vehicles |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1565589B1 (en) |
| AU (1) | AU2003289810A1 (en) |
| DE (2) | DE10255260A1 (en) |
| WO (1) | WO2004048629A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004053620A1 (en) * | 2004-11-03 | 2006-05-04 | Salzgitter Flachstahl Gmbh | High-strength, air-hardening steel with excellent forming properties |
| DE102007058222A1 (en) * | 2007-12-03 | 2009-06-04 | Salzgitter Flachstahl Gmbh | Steel for high-strength components made of tapes, sheets or tubes with excellent formability and special suitability for high-temperature coating processes |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2750867C2 (en) * | 1977-11-14 | 1983-10-20 | Benteler-Werke Ag Werk Neuhaus, 4790 Paderborn | Use of a steel alloy for pipes for door reinforcement |
| DE3415526C2 (en) * | 1984-04-26 | 1987-02-26 | Benteler-Werke AG, Werk Neuhaus, 4790 Paderborn | Use of a steel alloy for bicycle frame tubes |
| DE9013148U1 (en) * | 1990-09-15 | 1990-11-22 | Benteler AG, 4790 Paderborn | Steel wall tube of a pressure cylinder |
| JPH05302119A (en) * | 1992-03-27 | 1993-11-16 | Sumitomo Metal Ind Ltd | Production of high strength automotive parts |
| EP0753597A3 (en) * | 1995-07-06 | 1998-09-02 | Benteler Ag | Pipes for manufacturing stabilisers and manufacturing stabilisers therefrom |
| JP2006503175A (en) * | 2002-02-15 | 2006-01-26 | ベンテラー アウトモビールテヒニク ゲゼルシャフト ミット ベシュレンクテル ハフツング | Use of steel alloys as a material for pipes for producing pressure gas containers or as a material for producing shaped parts in lightweight steel structures |
-
2002
- 2002-11-27 DE DE2002155260 patent/DE10255260A1/en not_active Withdrawn
-
2003
- 2003-11-26 DE DE50302680T patent/DE50302680D1/en not_active Expired - Lifetime
- 2003-11-26 WO PCT/DE2003/003927 patent/WO2004048629A1/en not_active Application Discontinuation
- 2003-11-26 AU AU2003289810A patent/AU2003289810A1/en not_active Abandoned
- 2003-11-26 EP EP03782109A patent/EP1565589B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE50302680D1 (en) | 2006-05-11 |
| WO2004048629A1 (en) | 2004-06-10 |
| EP1565589A1 (en) | 2005-08-24 |
| AU2003289810A1 (en) | 2004-06-18 |
| DE10255260A1 (en) | 2004-06-09 |
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