EP3187615A1 - Herstellungsverfahren für flachgewalzte produkte aus zinkbasierten legierungen zur verwendung in der gebäudetechnik - Google Patents

Herstellungsverfahren für flachgewalzte produkte aus zinkbasierten legierungen zur verwendung in der gebäudetechnik Download PDF

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Publication number
EP3187615A1
EP3187615A1 EP15460142.1A EP15460142A EP3187615A1 EP 3187615 A1 EP3187615 A1 EP 3187615A1 EP 15460142 A EP15460142 A EP 15460142A EP 3187615 A1 EP3187615 A1 EP 3187615A1
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EP
European Patent Office
Prior art keywords
alloy
temperature
rolling
finished product
strip
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Withdrawn
Application number
EP15460142.1A
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English (en)
French (fr)
Inventor
Tomasz Napióra
Stanislaw Pawlicha
Tadeusz Knych
Andrzej Mamala
Piotr Osuch
Monika Walkowicz
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Zm Silesia SA
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Zm Silesia SA
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Publication date
Application filed by Zm Silesia SA filed Critical Zm Silesia SA
Priority to EP15460142.1A priority Critical patent/EP3187615A1/de
Publication of EP3187615A1 publication Critical patent/EP3187615A1/de
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
    • C22F1/165—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon of zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C18/00—Alloys based on zinc
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C18/00—Alloys based on zinc
    • C22C18/02—Alloys based on zinc with copper as the next major constituent

Definitions

  • Zn-Cu-Ti alloy sheet metal products designed for the building industry are manufactured in accordance with the EN-988 standard.
  • the finished product has to fulfill several requirements regarding the usable and operational properties.
  • One of the critical requirements is the sheet metal plasticity, also at temperature below 10°C. This fact is conditioned by the way of fitting of the roofing panels on the roof according to the standing seam technique, which requires that the sheet metal be bendable (including bending out) lengthwise in the rolling direction in order to make the joint of individual roofing panels during assembly of metal roof. Furthermore, it is required that the metal panel gives no evidence of cracks and fractures at the bending edge.
  • a number of manufacturing methods of Zn-Cu-Ti alloy sheet metal products has been worked out with particular regard to the desired bendability of the finished product, since the usable properties of 2n-Cu-Ti alloy sheet metal, especially the mechanical properties, therein bendability (including bending out), are formed mainly in the course of the rolling process.
  • the technological parameters of the rolling process such as the rolling temperature or plastic deformation speed, the last one understood as both the rolling speed and number of roll passes during rolling process with the reduction ratios resulting of the mill feedstock and finished product geometry, impart the mechanical properties of metallic materials in wide range of their variability, typical for a given alloy.
  • the patent specification Number GB1191994A discloses a sheet metal manufacture method, wherein the usable properties of Zn-Cu-Ti alloy sheets with the content of the main alloying components in form of Cu (from 0,05 to 2 wt.%), Ti (0,005 wt. % to 0,4 wt.
  • tramp elements such as: Ag, Cd, Fe, In, Pb, Sn are being shaped in the course of rolling process, where the mill feedstock temperature ranging from 230°C to 270°C and the reduction ratio in the first roll pass amounting to 80 % - 95 % were shown to be the most critical technological parameters being a requisite of the desired usable properties of the finished product with given chemical composition.
  • the U.S. patent specification Number 4051887 discloses a production method of Zn-Cu-Ti alloy sheets with the content of main alloying components in form of Cu (from 1,5 wt. % to 5,5 wt. %), Ti (0,05 wt. % to 0,25 wt. %) and the remainder being Zn, wherein the strip casting process accomplished in continuous way is integrated with the rolling process in such a manner that crystallized strip with a width from 500 mm to 1500 mm and thickness from 6 mm to 24 mm and temperature amounting to 360°C leaving the casting machine undergoes directly the rolling operation in five roll stands positioned one after the other. Each roll stand reduces the thickness of the metal strip by 50, at temperature of plastic deformation amounting to 270°C before the first roll pass what ensures the desired usable properties of the finished product.
  • polish patent specification Number PL195433 discloses a production technique of Zn-Cu-Ti alloy sheets designed for use in building engineering though a process consisting of casting operation of Zn-Cu-TI alloy strip with chemical composition in compliance with EN-988 standard according to the Twin Roll Casting (TRC) method and dis-integrated rolling process being characterized by reheating the strip before rolling operation up to the temperature of 190 °C and following rolling during 11 roll passes with a predetermined value of individual reduction ratios, as shown schematically in FIG. 1 .
  • TRC Twin Roll Casting
  • this process does not provide fully recrystallized microstructure, and thereby the product obtained in this way does not fulfil the highest expectations regarding the plasticity of sheet metal, especially in temperatures below 10°C.
  • the bendability (including bending out ability) of Zn-Cu-Ti alloy sheets is strictly connected with the fraction of recrystallization of metal microstructure in dynamic conditions of the rolling process, which is the case in the techniques disclosed in patent descriptions Number GB1191994A and US4051887 or recrystallization of the finished product in form of sheets in static conditions, which is the case according to the Patent Number PL195253 . It is proposed hereby a quite different method of inducing the dynamic recrystallization in the course of rolling process in order to solve the issue of limited plasticity of the sheets fabricated in rolling process from the strips coming mainly from continuous casting operations.
  • a restoration of microstructure through recrystallization, particularly in dynamic conditions, consists in two basic steps: nucleation and growth of new grains within the alloy microstructure deformed by the plastic strain.
  • the privileged nucleation sites of the new alloy grains are considered to be the boundaries of original grains, the particles of another phase and also the lattice defects formed in consequence of strain. Since the newly formed grains have lower inner energy than the strained zones, there is a propelling force aiming at growth of the recrystallization nuclei and consumption of neighbouring strained zones.
  • the relocation speed of boundaries of the newly formed grains is a diffusive factor depending strictly on temperature in such a way that the higher is the system temperature the bigger is the propelling force and relocation speed of grain boundaries.
  • the essential factor limiting relocation of the grain boundaries within the material microstructure are the atoms of alloying and tramp elements located in the metallic matrix.
  • the dynamic recrystallization is enabled through removal of obstacles impeding the movement of grain boundaries, i.e. atoms of alloying and tramp elements, without delivering additional energy to the system in order to obtain higher temperature of plastic deformation, which is the case in hitherto known sheet metal production methods with utilization of the dynamic recrystallization effect.
  • a significance of the invention consists in the following procedure: after continuous casting operation a strip of metal having a thickness from 4 mm to 16 mm and a width from 500 mm to 2000 mm undergoes the heat treatment process in a soaking pit at temperatures from 250 °C to 350 °C during a time from 10 minutes to 48 hours, then the strip is subject to cooling down to ambient temperature, and subsequently undergoes a heating up operation to temperature ranging from 160°C to 200°C before beginning of the rolling process and rolled successively in at least three roll passes until the finished product is obtained.
  • the strip is subject to dynamic recrystallization at initial rolling temperature in the range of 160°C - 200°C through coagulation of zinc-titanium particles in alloy microstructure achieved by heat treatment.
  • the reduction ratios obtained in particular roll passes of the rolling process are less than 35 %.
  • the finished product is subject to bending at temperature starting from + 5°C.
  • the Zn-Cu-Ti alloy contains from 0,08 wt. % to 0,24 wt. % Cu, from 0,06 wt. % to 0,12 wt. % Ti, not more than 0,015 wt. % Al and rest Zn and tramp elements such as Cd, Fe, Pb and Sn.
  • the final microstructure of metal strip cast from Zn-Cu-Ti alloy is composed in principle of two primary phases - zinc matrix and particles of another phase - Zn 15 Ti - typical for alloys with chemical composition under consideration, occurring in the strips coming from continuous casting operation in form of small particles with sizes from several hundred nm to several ⁇ m dissipated in the whole volume of metal strip and possibly in form of big eutectic particles located mainly in the strip axis with sizes of tens ⁇ m order, as shown in FIG. 3 .
  • a production method being subject of present patent application comprises fabrication of Zn-Cu-Ti alloy strip according to the continuous casting technique and its subsequent heat treatment, which leads to coagulation of particles of another phase occurring in microstructure through atomic diffusion, i.e. random thermally-activated movement of alloying and tramp elements atoms, as shown in FIG. 4 .
  • atomic diffusion i.e. random thermally-activated movement of alloying and tramp elements atoms
  • FIG. 4 Thereby an effect consisting in clearing the metallic matrix from individual atoms of alloying and tramp elements is obtained.
  • subsequent technological step i.e. rolling process
  • a microstructure of this type enables the occurrence of dynamical recrystallization process at significantly lower temperatures than in case of hitherto known production methods and achievement of fully recrystallized microstructure of the finished product, as shown in FIG. 5 .
  • the Zn-Cu-Ti alloy with a chemical composition containing 0,15 wt. % Cu; 0,07 wt. % Ti; 0,003 %,. Al and remaining tramp elements such as (among other things) Cd, Fe, Pb, Sn and rest Zn is cast in continuous manner according to the Twin Roll Casting (TRC) technique in form of strip with thickness of 8 mm and width of 1100 mm, which is wound in coils weighing 6 tons.
  • the coil has a temperature amounting to 100°C and is cooling down freely to the ambient temperature.
  • the metal strip is subject to heat treatment operation at temperature 320 °C for 2 hours.
  • the coil dwell time in the soaking-pit comprises additionally the time of heating up of the furnace and coil of Zn-Cu-Ti strip until reaching the set temperature. After soaking the coils are removed from the soaking-pit and cool down at ambient temperature for at least 24 hours. After expiration of this time the coil is placed once again in the soaking-pit in order to heat it up to the rolling temperature amounting to 180°C. When the strip placed in soaking-pit reaches the set temperature across the whole coil section, the coil is conducted to the rolling process, which is accomplished by means of roll stand in four-high reversing system.
  • the rolling process of metal strip with input thickness of 8 mm is carried out until one of the set thicknesses of finished product defined in EN-988 standard is obtained, in 8 roll passes with reduction ratios amounting to 25 % - 35 %.
  • the coil has a temperature of 70°C and then cools down in ambient temperature.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Metal Rolling (AREA)
EP15460142.1A 2015-12-31 2015-12-31 Herstellungsverfahren für flachgewalzte produkte aus zinkbasierten legierungen zur verwendung in der gebäudetechnik Withdrawn EP3187615A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15460142.1A EP3187615A1 (de) 2015-12-31 2015-12-31 Herstellungsverfahren für flachgewalzte produkte aus zinkbasierten legierungen zur verwendung in der gebäudetechnik

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15460142.1A EP3187615A1 (de) 2015-12-31 2015-12-31 Herstellungsverfahren für flachgewalzte produkte aus zinkbasierten legierungen zur verwendung in der gebäudetechnik

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EP3187615A1 true EP3187615A1 (de) 2017-07-05

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EP15460142.1A Withdrawn EP3187615A1 (de) 2015-12-31 2015-12-31 Herstellungsverfahren für flachgewalzte produkte aus zinkbasierten legierungen zur verwendung in der gebäudetechnik

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1558502A1 (de) * 1967-05-27 1970-04-16 Grillo Werke Ag Tiefziehfaehige Zinklegierungen mit hoher Zugfestigkeit und Verfahren zur Herstellung von Zinkhalbzeug
GB1191994A (en) 1967-12-15 1970-05-13 Centre Nat Rech Metall Improvements in or relating to the Rolling of Zinc Based Alloys
US4051887A (en) 1975-03-13 1977-10-04 Rheinisches Zinkwalzwerk Gmbh & Co. Kg Process for producing sheets and strip of zinc-copper-titanium alloy
PL195433A1 (pl) 1977-01-20 1978-07-31 Regionalny Zwiazek Spoldzielni Poduszka ratunkowa
PL195253B1 (pl) 2001-08-21 2007-08-31 Zaklady Metalurgiczne Silesia Sposób wytwarzania taśm oraz blach ze stopu cynku z miedzią i tytanem oraz układ urządzeń do wytwarzania taśm oraz blach ze stopu cynku

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1558502A1 (de) * 1967-05-27 1970-04-16 Grillo Werke Ag Tiefziehfaehige Zinklegierungen mit hoher Zugfestigkeit und Verfahren zur Herstellung von Zinkhalbzeug
GB1191994A (en) 1967-12-15 1970-05-13 Centre Nat Rech Metall Improvements in or relating to the Rolling of Zinc Based Alloys
US4051887A (en) 1975-03-13 1977-10-04 Rheinisches Zinkwalzwerk Gmbh & Co. Kg Process for producing sheets and strip of zinc-copper-titanium alloy
PL195433A1 (pl) 1977-01-20 1978-07-31 Regionalny Zwiazek Spoldzielni Poduszka ratunkowa
PL195253B1 (pl) 2001-08-21 2007-08-31 Zaklady Metalurgiczne Silesia Sposób wytwarzania taśm oraz blach ze stopu cynku z miedzią i tytanem oraz układ urządzeń do wytwarzania taśm oraz blach ze stopu cynku

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
G. BOCZKAL ET AL: "THE BRITTLENESS OF Zn-Cu-Ti SHEET ALLOYS", ARCHIVES OF METALLURGY AND MATERIALS, vol. 60, no. 3, 12 September 2015 (2015-09-12), pages 2355 - 2360, XP055302946, DOI: 10.1515/amm-2015-0384 *

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