EP2071047A1 - Method for producing a zinc-plated shaped component made of steel - Google Patents
Method for producing a zinc-plated shaped component made of steel Download PDFInfo
- Publication number
- EP2071047A1 EP2071047A1 EP08019170A EP08019170A EP2071047A1 EP 2071047 A1 EP2071047 A1 EP 2071047A1 EP 08019170 A EP08019170 A EP 08019170A EP 08019170 A EP08019170 A EP 08019170A EP 2071047 A1 EP2071047 A1 EP 2071047A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- zinc
- heat treatment
- steel
- treatment
- shaped component
- 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.)
- Withdrawn
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 13
- 239000010959 steel Substances 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 18
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 16
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 16
- 239000011701 zinc Substances 0.000 claims abstract description 16
- 238000000576 coating method Methods 0.000 claims abstract description 14
- 239000011248 coating agent Substances 0.000 claims abstract description 6
- 230000001681 protective effect Effects 0.000 claims description 2
- 230000005855 radiation Effects 0.000 abstract description 3
- 238000005246 galvanizing Methods 0.000 description 8
- 238000005422 blasting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229910001297 Zn alloy Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000004381 surface treatment Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 description 1
- 229910001338 liquidmetal Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000005480 shot peening Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
- C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
Definitions
- the invention relates to a method for producing a galvanized shaped component made of steel, in which the surface of the molded component is pretreated by a blast treatment and then provided in a coating process with a coating of zinc.
- Galvanizing provides steel with a thin layer of zinc to protect it from corrosion.
- To coat a steel forming member with zinc or a zinc alloy layer there are a number of different methods. The most commonly used coating process is the hot dip process, in particular hot dip galvanizing.
- a coating can be achieved by galvanic or electrolytic deposition from solutions, by metal spraying or by diffusion.
- the mold components Before galvanizing, the mold components are subjected to a pretreatment.
- the surface is blasted with corundum.
- a surface treatment by shot peening before and / or after the hot dip galvanizing is performed.
- the DE 40 36 827 A1 discloses a method of making a high corrosion resistant tough steel profile comprising the steps of forming an initial profile, heat treating, descaling and applying a zinc layer, wherein the galvanizing is part of the heat treatment.
- the US 2,442,485 A describes a process for descaling and coating steel in which a steel component is mechanically descaled, subjected to a treatment in a hot non-oxidizing atmosphere and subsequently coated with zinc.
- a blasting treatment can be carried out for cleaning the mold components, in particular in order to free them from oxide layers (scale) from a forming process. Furthermore, a blast treatment can also be carried out to eliminate tensile / residual stresses in the molded component. In addition, the load-bearing capacity of the molded components can be increased by cold hardening by the blast treatment. This is advantageous in the case of molded components which are subjected to swelling or alternating stress.
- the invention is therefore based on the object to show a method for producing a galvanized shaped component made of steel, in which the risk of excessive or uncontrolled zinc layer thickness growth is significantly reduced in the coating process.
- the method is initially based on a formed in a press tool molding made of steel.
- the individual or by further manufacturing steps, in particular joining processes, further processed molding component is then cleaned by a blast treatment, wherein an oxide layer or other impurities are removed.
- residual stresses, in particular residual tensile stresses, in the molded component from forming or joining processes can be reduced.
- the shaped component is subjected to a heat treatment after the blast treatment and before the coating process. Surprisingly, it has been found that the effect of the accelerated growth of the zinc or the iron-zinc alloy layer can be reduced or even eliminated by a heat treatment after the blasting treatment.
- the mold components are provided with a zinc coating by hot dip galvanizing.
- high-quality, uniformly thick zinc layers in the range between 30 and 100 .mu.m, in particular between 40 and 70 microns, are produced.
- the inventive method leads to a reduced consumption of zinc and thus allows a weight saving in the finished molded component. About that In addition, adverse effects of too thick zinc layers can be avoided on the durability of the molded components. Especially in the automotive industry or vehicle technology, the weight savings and the lower influence on the operating strength is a considerable advantage.
- the heat treatment after the blast treatment is carried out in a temperature range of 450 ° C. to 800 ° C. typical for stress relief or soft annealing.
- the heat treatment is carried out under a protective gas atmosphere to prevent oxidation or other adverse effects in the heat treatment.
- the heat treatment can take place over a period of 0.25 to 10 hours. Experiments with a heat treatment at 700 ° C for 15 minutes gave very good results. Also, a heat treatment at a temperature of 550 ° C over a period of 45 minutes can expect good results.
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Herstellung eines verzinkten Formbauteils aus Stahl, bei welchem die Oberfläche des Formbauteils durch eine Strahlbehandlung vorbehandelt und anschließend in einem Beschichtungsvorgang mit einer Beschichtung aus Zink versehen wird.The invention relates to a method for producing a galvanized shaped component made of steel, in which the surface of the molded component is pretreated by a blast treatment and then provided in a coating process with a coating of zinc.
Durch Verzinken wird Stahl mit einer dünnen Schicht Zink versehen, um ihn vor Korrosion zu schützen. Um ein Formbauteil aus Stahl mit Zink oder einer Zinklegierungsschicht zu überziehen, gibt es eine Reihe von verschiedenen Verfahren. Das gebräuchlichste Beschichtungsverfahren ist das Schmelztauchverfahren, insbesondere die Feuerverzinkung. Weiterhin kann eine Beschichtung durch galvanische bzw. elektrolytische Abscheidung aus Lösungen, im Metallspritzverfahren oder durch Diffusion erreicht werden.Galvanizing provides steel with a thin layer of zinc to protect it from corrosion. To coat a steel forming member with zinc or a zinc alloy layer, there are a number of different methods. The most commonly used coating process is the hot dip process, in particular hot dip galvanizing. Furthermore, a coating can be achieved by galvanic or electrolytic deposition from solutions, by metal spraying or by diffusion.
Vor dem Verzinken werden die Formbauteile einer Vorbehandlung unterzogen. Zur Optimierung des Verzinkungsprozesses ist es in diesem Zusammenhang bekannt, eine Strahlbehandlung der Formbauteile mittels Strahlkörpern, wie Stahlkies, vorzunehmen. Bei dem aus der
Die
Die
Eine Strahlbehandlung kann zum Reinigen der Formbauteile durchgeführt werden, insbesondere, um diese von Oxidschichten (Zunder) aus einem Umformvorgang zu befreien. Des Weiteren kann eine Strahlbehandlung auch zur Eliminierung von Zug-/Eigenspannungen im Formbauteil vorgenommen werden. Zudem kann durch die Strahlbehandlung auch die Tragfähigkeit der Formbauteile durch Kalthärtung gesteigert werden. Dies ist bei Formbauteilen, die einer Schwell- oder Wechselbeanspruchung ausgesetzt werden, vorteilhaft.A blasting treatment can be carried out for cleaning the mold components, in particular in order to free them from oxide layers (scale) from a forming process. Furthermore, a blast treatment can also be carried out to eliminate tensile / residual stresses in the molded component. In addition, the load-bearing capacity of the molded components can be increased by cold hardening by the blast treatment. This is advantageous in the case of molded components which are subjected to swelling or alternating stress.
Durch die Strahlbehandlung können nachfolgende Prozessschritte der üblichen Vorbehandlung mit geringerer Auswirkung auf das Verzinkungsgut durchgeführt werden. So kann zum einen eine vergleichsweise kurze Beizzeit verwendet werden, was bei kritischen, insbesondere hochfesten, Stählen die Gefahr der Wasserstoffversprödung minimiert. Zum anderen wird durch die Reduzierung der Eigenspannungen im Bauteil die Gefahr der wasserstoffinduzierten als auch der flüssigmetallinduzierten Rissbildung deutlich herabgesetzt.By the blast treatment subsequent process steps of the usual pre-treatment can be carried out with less impact on the galvanizing. Thus, for a comparatively short pickling time can be used, which minimizes the risk of hydrogen embrittlement in critical, especially high-strength, steels. On the other hand, reducing the residual stresses in the component significantly reduces the risk of both hydrogen-induced and liquid-metal-induced cracking.
Mit steigender Intensität des Strahlens wird allerdings ein erhebliches Wachstum der Zinkschichtdicke beobachtet. Damit geht sowohl eine Gewichtszunahme der Formbauteile als auch ein erhöhter Zinkverbrauch einher. Zudem ist mit steigender Zinkschichtdicke auch von einem wachsenden negativen Einfluss auf die Betriebsfestigkeit des Formbauteils auszugehen.As the intensity of the radiation increases, however, a considerable growth of the zinc layer thickness is observed. This is accompanied by both an increase in weight of the mold components and increased zinc consumption. In addition, as the zinc layer thickness increases, there is also a growing negative influence on the fatigue strength of the molded component.
Der Erfindung liegt daher die Aufgabe zu Grunde, ein Verfahren zur Herstellung eines verzinkten Formbauteils aus Stahl aufzuzeigen, bei dem die Gefahr eines zu großen oder unkontrollierten Zinkschichtdickenwachstums im Beschichtungsvorgang deutlich vermindert ist.The invention is therefore based on the object to show a method for producing a galvanized shaped component made of steel, in which the risk of excessive or uncontrolled zinc layer thickness growth is significantly reduced in the coating process.
Die Lösung dieser Aufgabe besteht nach der Erfindung in einem Verfahren gemäß Anspruch 1.The solution to this problem consists according to the invention in a method according to claim 1.
Das Verfahren geht zunächst von einem in einem Pressenwerkzeug geformten Formbauteil aus Stahl aus. Das einzelne bzw. durch weitere Fertigungsschritte, insbesondere Fügeprozesse, weiter verarbeitete Formbauteil wird dann durch eine Strahlbehandlung gereinigt, wobei eine Oxidschicht oder andere Verunreinigungen entfernt werden. Des Weiteren können Eigenspannungen, insbesondere Zugeigenspannungen, im Formbauteil aus Umform- bzw. Fügeprozessen reduziert werden. Das Formbauteil wird erfindungsgemäß nach der Strahlbehandlung und vor dem Beschichtungsvorgang einer Wärmebehandlung unterzogen. Überraschenderweise hat sich gezeigt, dass der Effekt des zu starken bzw. beschleunigten Wachstums der Zink- bzw. der Eisen-Zink-Legierungsschicht durch eine Wärmebehandlung nach der Strahlbehandlung gemindert oder sogar eliminiert werden kann.The method is initially based on a formed in a press tool molding made of steel. The individual or by further manufacturing steps, in particular joining processes, further processed molding component is then cleaned by a blast treatment, wherein an oxide layer or other impurities are removed. Furthermore, residual stresses, in particular residual tensile stresses, in the molded component from forming or joining processes can be reduced. According to the invention, the shaped component is subjected to a heat treatment after the blast treatment and before the coating process. Surprisingly, it has been found that the effect of the accelerated growth of the zinc or the iron-zinc alloy layer can be reduced or even eliminated by a heat treatment after the blasting treatment.
Nach der Wärmebehandlung werden die Formbauteile durch Feuerverzinken mit einer Beschichtung aus Zink versehen. Hierbei können qualitativ hochwertige, gleichmäßig dicke Zinkschichten im Bereich zwischen 30 und 100 µm, insbesondere zwischen 40 und 70 µm, erzeugt werden.After the heat treatment, the mold components are provided with a zinc coating by hot dip galvanizing. In this case, high-quality, uniformly thick zinc layers in the range between 30 and 100 .mu.m, in particular between 40 and 70 microns, are produced.
Das erfindungsgemäße Verfahren führt zu einem verringerten Zinkverbrauch und ermöglicht so eine Gewichtseinsparung beim fertigen Formbauteil. Darüber hinaus können nachteilige Einflüsse von zu dicken Zinkschichten auf die Betriebsfestigkeit der Formbauteile vermieden werden. Besonders im Automobilbau bzw. der Fahrzeugtechnik stellen die Gewichtseinsparung und die geringere Beeinflussung der Betriebsfestigkeit einen erheblichen Vorteil dar.The inventive method leads to a reduced consumption of zinc and thus allows a weight saving in the finished molded component. About that In addition, adverse effects of too thick zinc layers can be avoided on the durability of the molded components. Especially in the automotive industry or vehicle technology, the weight savings and the lower influence on the operating strength is a considerable advantage.
Vorteilhafte Ausgestaltungen und Weiterbildungen des erfindungsgemäßen Verfahrens sind Gegenstand der abhängigen Ansprüche 2 bis 5.Advantageous embodiments and further developments of the method according to the invention are the subject of the dependent claims 2 to 5.
Die Wärmebehandlung nach der Strahlbehandlung wird in einem für das Spannungsarm- bzw. Weichglühen typischen Temperaturbereich von 450 °C bis 800 °C durchgeführt. Als besonders effektiv wird ein für das Weichglühen typischer Temperaturbereich von 650 °C bis 750 °C angesehen. Vorzugsweise wird die Wärmebehandlung unter einer Schutzgasatmosphäre durchgeführt, um einer Oxidation oder anderen nachteiligen Einflüssen bei der Wärmebehandlung vorzubeugen.The heat treatment after the blast treatment is carried out in a temperature range of 450 ° C. to 800 ° C. typical for stress relief or soft annealing. A temperature range of 650 ° C to 750 ° C, which is typical for soft annealing, is considered to be particularly effective. Preferably, the heat treatment is carried out under a protective gas atmosphere to prevent oxidation or other adverse effects in the heat treatment.
Die Wärmebehandlung kann über eine Zeit von 0,25 bis 10 Stunden erfolgen. Versuche mit einer Wärmebehandlung bei 700 °C über eine Dauer von 15 Minuten erbrachten sehr gute Ergebnisse. Auch eine Wärmebehandlung bei einer Temperatur von 550 °C über einen Zeitraum von 45 Minuten lässt gute Ergebnisse erwarten.The heat treatment can take place over a period of 0.25 to 10 hours. Experiments with a heat treatment at 700 ° C for 15 minutes gave very good results. Also, a heat treatment at a temperature of 550 ° C over a period of 45 minutes can expect good results.
Claims (5)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007059714A DE102007059714A1 (en) | 2007-12-10 | 2007-12-10 | Process for producing a galvanized shaped steel component |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2071047A1 true EP2071047A1 (en) | 2009-06-17 |
Family
ID=40202078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08019170A Withdrawn EP2071047A1 (en) | 2007-12-10 | 2008-11-03 | Method for producing a zinc-plated shaped component made of steel |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2071047A1 (en) |
| DE (1) | DE102007059714A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013010025A1 (en) * | 2013-06-17 | 2014-12-18 | Muhr Und Bender Kg | Method for producing a product from flexibly rolled strip material |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102011002730B4 (en) * | 2011-01-14 | 2014-06-26 | Scherdel Innotec Forschungs- Und Entwicklungs-Gmbh | Method for producing a corrosion-resistant spring, and corrosion-resistant spring produced therefrom |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2442485A (en) | 1944-06-24 | 1948-06-01 | Frederick C Cook | Method of descaling and coating hot-rolled ferrous metal |
| DE2601360A1 (en) | 1976-01-15 | 1977-07-21 | Metallgesellschaft Ag | Hot dip galvanizing of steel - using shot blasted steel with low silicon content to produce thinner zinc coatings |
| JPS58110665A (en) | 1981-12-22 | 1983-07-01 | Sumitomo Metal Ind Ltd | Production of galvanized steel plate |
| JPS5913058A (en) | 1982-07-14 | 1984-01-23 | Nisshin Steel Co Ltd | Manufacture of galvanized steel plate |
| DE4036827A1 (en) | 1989-10-26 | 1991-05-23 | Mannesmann Ag | Making a steel profile with outer corrosion protection - by heat treating, scaling, applying zinc coating and heat treating thus improving productivity |
| WO1991011541A1 (en) * | 1990-01-25 | 1991-08-08 | Tubemakers Of Australia Limited | Inline galvanising process |
| EP0496678A1 (en) | 1991-01-23 | 1992-07-29 | Delot Process S.A. | Process for continuous galvanizing at high temperature |
| EP0823490A1 (en) | 1996-02-22 | 1998-02-11 | Sumitomo Metal Industries, Ltd. | Galvannealed sheet steel and process for producing the same |
| DE10321259A1 (en) | 2003-05-06 | 2004-11-25 | Volkswagen Ag | Surface treating dynamically loaded components made from metal, especially springs for vehicles, comprises hot galvanizing the components and surface quenching by shot peening before and/or after galvanizing |
-
2007
- 2007-12-10 DE DE102007059714A patent/DE102007059714A1/en not_active Ceased
-
2008
- 2008-11-03 EP EP08019170A patent/EP2071047A1/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2442485A (en) | 1944-06-24 | 1948-06-01 | Frederick C Cook | Method of descaling and coating hot-rolled ferrous metal |
| DE2601360A1 (en) | 1976-01-15 | 1977-07-21 | Metallgesellschaft Ag | Hot dip galvanizing of steel - using shot blasted steel with low silicon content to produce thinner zinc coatings |
| JPS58110665A (en) | 1981-12-22 | 1983-07-01 | Sumitomo Metal Ind Ltd | Production of galvanized steel plate |
| JPS5913058A (en) | 1982-07-14 | 1984-01-23 | Nisshin Steel Co Ltd | Manufacture of galvanized steel plate |
| DE4036827A1 (en) | 1989-10-26 | 1991-05-23 | Mannesmann Ag | Making a steel profile with outer corrosion protection - by heat treating, scaling, applying zinc coating and heat treating thus improving productivity |
| WO1991011541A1 (en) * | 1990-01-25 | 1991-08-08 | Tubemakers Of Australia Limited | Inline galvanising process |
| EP0496678A1 (en) | 1991-01-23 | 1992-07-29 | Delot Process S.A. | Process for continuous galvanizing at high temperature |
| EP0823490A1 (en) | 1996-02-22 | 1998-02-11 | Sumitomo Metal Industries, Ltd. | Galvannealed sheet steel and process for producing the same |
| DE10321259A1 (en) | 2003-05-06 | 2004-11-25 | Volkswagen Ag | Surface treating dynamically loaded components made from metal, especially springs for vehicles, comprises hot galvanizing the components and surface quenching by shot peening before and/or after galvanizing |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013010025A1 (en) * | 2013-06-17 | 2014-12-18 | Muhr Und Bender Kg | Method for producing a product from flexibly rolled strip material |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102007059714A1 (en) | 2009-06-18 |
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