US20170298463A1 - Method for producing metal band material with different mechanical properties across the width of the band - Google Patents

Method for producing metal band material with different mechanical properties across the width of the band Download PDF

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Publication number
US20170298463A1
US20170298463A1 US15/515,972 US201515515972A US2017298463A1 US 20170298463 A1 US20170298463 A1 US 20170298463A1 US 201515515972 A US201515515972 A US 201515515972A US 2017298463 A1 US2017298463 A1 US 2017298463A1
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Prior art keywords
band
heating
zones
heated
cooling
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US15/515,972
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English (en)
Inventor
Peter Atzmüller
Andreas Pichler
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Voestalpine Stahl GmbH
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Voestalpine Stahl GmbH
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Assigned to VOESTALPINE STAHL GMBH reassignment VOESTALPINE STAHL GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ATZMÜLLER, Peter, PICHLER, ANDREAS
Publication of US20170298463A1 publication Critical patent/US20170298463A1/en
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    • 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
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • 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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing 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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • 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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • 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
    • C21D2221/00—Treating localised areas of an article
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the invention relates to a method and devices for producing metal band material with different mechanical properties across the width of the band.
  • EP 2 529 038 B1 has disclosed a method for heat treating metal band material in which the metal band material is supposed to have different properties that vary across the width of the band. This method is particularly intended for use in a continuous annealing system and its stated object is to heat and/or cool the band differently.
  • EP 2 529 038 B1 does not indicate a technical attainment of any of these objects.
  • the objects mentioned in this document are the different heating of the steel band material across the width, in particular above or below the Ac1 temperature and in particular above or below the Ac3 temperature so that within the band, a variation in the absolute maximum temperatures should be present and then, the different-temperature regions should be cooled at different speeds or at the same speed.
  • it is disadvantageous that basically different temperatures in the band result in the fact that the steel band assumes different thermal expansions or thermal expansion states. This results in the fluttering of the band that is to be feared in continuous annealing systems.
  • EP 0 155 753 has disclosed measuring the different temperatures of the band across the width and compensating for them across the width of the band by means of cooling gas flows so that the temperature is distributed uniformly, thus achieving a uniform thermal expansion state, permitting the band to be flat.
  • DE 29 52 670 A1 has disclosed a cooling method for steel bands in a continuous annealing with an overaging zone; the cooling in this case takes place in two stages with different temperatures.
  • DE 10 2008 010 062 A1 has disclosed a method for hot rolling and heat treating a band of steel.
  • a plate slab that is to be rolled is first heated, the plate slab is rolled to the desired band thickness, after this, the band is cooled, with the band having a temperature greater than the ambient temperature after the cooling, and then the band is wound into a coil. This band is then heated again, cooled, and transported.
  • DE 10 2008 049 537 A1 has disclosed a method for cooling a rough band or band of a metal strand in a hot-rolling plant.
  • a coolant is sprayed onto the rough band or band; the rough band or band is shielded in the region of the band edges by being acted on with the coolant, for which purpose shielding devices are provided.
  • Another shielding device can be positioned in the region of a looper or in a cooling device between the roughing stand and the finishing mill. This is supposed to reduce temperature differences in the band, particularly in cooler band edges, in order to reduce the wear on the rolling mill.
  • US 2009/0090437 A1 relates to a method for producing metal plates in which a temperature gradient is set across at least one direction of the plane of the plate (width or thickness and/or length or width).
  • JP 2004 11 5830 A has disclosed a method whose purpose is to achieve a control and monitoring of the cooling and in particular, to achieve a harmonization across the width of the band by preventing excessive cooling of the edge regions of the steel sheet.
  • This method also uses different so-called “air boxes” by means of which cooling liquid is blown at different speeds.
  • the mechanical properties that are mainly required in this context are tensile strength (R m ) and ductility. These two properties have a direct influence on the safety of the vehicle because they influence the crash properties. If the components of a passenger compartment are very strong, but have a low ductility, then although they do in fact resist very powerful forces, they nevertheless break relatively quickly, without absorbing a sufficient amount of energy. If the components are ductile but insufficiently strong, then they can in fact absorb energy, but they may permit too powerful a deformation.
  • the solution to these problems lies, for example, in zonally different mechanical properties of such components or of sheets that are processed to produce such components.
  • a blank out of a homogeneous steel material which can, for example, be quench-hardened.
  • steel materials of this kind are boron-manganese steels with carbon contents of between 0.10 and 0.4%.
  • they are heated to a temperature above the austenitization temperature (Ac3) and are then quenched, i.e. cooled at a cooling speed that lies above the so-called critical hardening speed.
  • the critical hardening speed is 20° C./s.
  • the austenite is transformed into martensite; the transformation of the steel phases results in a distortion in the metal lattice, which dictates the high degree of hardness.
  • Other phase transformations within the lattice of steel materials also lead to comparable hardening effects, but these may not be quite as pronounced.
  • the manner of the heating, the absolute height of the treatment temperature, and the manner of cooling of steel materials can be used in the broadest sense to exert influence on the structure, which in turn determines the influence on the hardness and ductility.
  • One possibility is to not heat regions of the blank to the austenitization temperature (or to other desired transformation temperatures), but to have them remain below this transformation temperature. In a subsequent uniform cooling of the component, the transformations into other phases in these regions do not take place or do not take place in this form so that different hardnesses and ductilities are achieved.
  • Another possibility is to evenly heat the blank to a uniform temperature, but to only quench-harden the regions that are supposed to have a high degree of hardness, while the remaining regions are cooled more slowly and therefore do not achieve this hardness and remain more ductile. This also affects other transformations, not just austenite-martensite transformation; in other transformations, different maximum temperatures and different cooling speeds are required.
  • a third possibility is to heat the blank uniformly and then to quench harden it uniformly, but then to re-anneal regions that are supposed to remain soft, and thus to partially undo the hardening effect.
  • Hardening effects are known not only in boron-manganese steels, which are in particular referred to as press-hardened steels.
  • Other steels such as dual-phase and multi-phase steels such as DP steels and TRIP steels can be adjusted with regard to the mechanical properties mentioned above by means of heat treatments that are known from the basic execution and from the corresponding limiting temperatures and cooling temperatures.
  • band material can also be correspondingly heat treated.
  • band steel which passes through a continuous annealing system, can be cooled with different cooling rates in order, for example, to ensure a uniform temperature in the band.
  • one object is also to embody the heating of a band in a zonally different way across the width.
  • the object of the invention is to create a method with which steel bands can be heat treated in a continuous heat treating system, with better control of the process.
  • a band is heated in a zonally different way, the heating in this case being carried out so that a high dividing precision of the heated zones can be achieved.
  • a first measure according to the invention seeks to match the guidance of the bands inside the system to the different thermal expansion state.
  • the guide elements namely the rollers
  • the guide elements are correspondingly matched to the waviness of the band and are embodied as correspondingly convex or concave.
  • the guide elements namely the rollers
  • the guide elements are correspondingly matched to the waviness of the band and are embodied as correspondingly convex or concave.
  • the rollers are correspondingly matched to this, in particular, are embodied as partially concave or partially convex.
  • the zonal heating of the band is carried out so that a high dividing precision between the zones is achieved.
  • a high dividing precision in the zonal heating of the band is achieved in that above the desired heating zones of the band, inductors are provided, which selectively heat the corresponding zones of the band to the predetermined temperature.
  • the band speed and/or the intensity of the induction and/or the size or length of the inductors in relation to the transport direction of the band is/are matched to the desired induction power.
  • the surface of the band is acted on by means of radiators, radiant tubes, flames, or the like; in order to increase the zonal dividing precision between the corresponding zones, partition walls are provided in order to avoid a heating of the other zones or of the edge regions.
  • the emissivity of the band can be influenced, either through adaptation of the coating (e.g. Z or ZF) and by means of paints, or through influencing by means of burners.
  • the coating e.g. Z or ZF
  • a gas flow against the surface of the band due to suction or blowing can be adjusted so that hot gases from one zone cannot cross over into another, here, too, the distance of the partition walls from the band surface can be adjusted correspondingly.
  • the band can be kept at the desired low temperature.
  • this can happen in that particularly with the presence of partition walls, a cooling gas flow can be directed onto the band surface, but this flow advantageously does not reach the heating zones.
  • this is implemented in that in these regions, on one or two sides, cooling rollers or rollers with a high thermal capacity are provided, which absorb the heat flow acting on the band and thus counteract an increase in the temperature.
  • a heating device can act on the entire band.
  • the different thermal states of the band and the corresponding subsequent cooling are achieved over a relatively short distance, for example after a deflection by means of a lower roller in the ascending run of the band until the upper roller, within the distance between the lower roller and upper roller (or vice versa) so that the thermal expansion state across the width of the band is uniform again when the upper roller is reached, as a result of which, the deflecting rollers—which are subjected to powerful loads—can guide a flat band while between the deflecting rollers, guide rollers can be provided, which, by means of a corresponding convexity, limit the fluttering of the band between the two deflecting rollers.
  • the band needs about 10 seconds to travel through a pass. If the local heating is introduced at one end and the cooling takes place at the other end, then when a band reaches the deflection roller, it has a homogenous temperature.
  • One particularly important mechanical property is the tensile strength Rm.
  • the difference in the mechanical properties of the treated zone(s) in comparison to the rest of the band is at least 20 MPa, preferably 50 MPa.
  • FIG. 1 shows a very schematic view of a first embodiment of a device for zonally heating a metal band
  • FIG. 2 shows a very schematic view of another embodiment of a device for zonally heating a metal band
  • FIG. 3 shows a guide roller for guiding a zonally heated metal band in a first embodiment
  • FIG. 4 shows a guide roller for guiding a zonally heated metal band in another embodiment
  • FIG. 5 shows a very schematic view of an another embodiment of a guide roller for a zonally heated metal hand.
  • a metal band 1 and in particular a metal band 1 which is conveyed through a device for heat treating a metal band, is heated in a zonally different way across its width B ( FIG. 1 ). This can also take place in the form of an additional heating after a basic heating has already been carried out (recrystallization).
  • the metal band has different mechanical properties such as the tensile strength Rm.
  • the zone relates to a width section, which, across its entire height (band thickness), has this different property in comparison to the rest of the band. This is particularly true of steel belts with a maximum thickness of 5 mm, particularly preferably 0.5 mm to 3 mm.
  • a band width of at most 1 ⁇ 3 of the total band width is carried out.
  • the zone(s), however, can also be divided from one another on the band, i.e. there can also be an untreated width section between 2 heat-treated width sections.
  • the minimum width for the zonal heating can preferably be greater than 100 mm in order to adjust the mechanical properties in a more efficient way.
  • the device for heating or heat-treating the metal band in particular a steel band
  • a metallic hot-dip coating zinc-based or aluminum-based coating
  • a heating device 2 is provided in one or more zones in which a higher temperature of the band 1 is specified (Z 2 in FIG. 1 ).
  • the heating device 2 can be an intrinsically known heating device, in particular it can involve radiant tubes, an electrical heating unit, a flame heating unit, a flame in a jacket radiant tube, or an inductor, This heating device 2 acts on the surface of the band 1 .
  • these regions can be provided with cooling devices 3 , which act on the surface of the steel band 1 .
  • the cooling devices 3 are depicted as blowers in FIG. 1 .
  • the blowers direct a cooling gas flow—which is metered in terms of its quantity, speed, and temperature—onto the surface of the metal band 1 .
  • a cooling gas flow which is metered in terms of its quantity, speed, and temperature—onto the surface of the metal band 1 .
  • the cooling gas flow applied to the surface is advantageously applied in the region in which heat develops in the heated zone Z 2 ; the cooling gas flow is also advantageously withdrawn again at the end of the heating section in the zone Z 2 in order to avoid an overflow of the gas flow into the heating zone Z 2 .
  • the cooling can also take place in a different way, in particular by means of spraying with fluids or through contact with solid objects.
  • partition walls or partition curtains 4 can be provided in order to define the respective zones.
  • the ends 5 of the respective curtains or partition walls 4 oriented toward the steel band can thus be spaced a short distance away from the steel or metal band 1 and in particular, an arching of the band caused by the heating can be compensated for by changing the length and the walls 4 , which means that the distance of the ends 5 from the steel surface 1 is always as uniform as possible.
  • gas outlet openings can be provided, from which a gas flows, which forms a gas curtain for dividing the atmospheres of the zones Z 1 , Z 2 , and Z 3 .
  • the walls 4 are then correspondingly embodied so that they can absorb a corresponding gas flow and convey it to the ends or end edges 5 .
  • the ends 6 of the outer walls 4 in this case can extend laterally beyond the steel band and can thus also cover the free edges.
  • This arrangement can also be doubled and can act across the width of the band from both sides.
  • a zone that is to be heated (Z 2 in this case) is acted on with heat by means of a heating device.
  • the heating device 2 can be a heating device that is intrinsically known for such purposes; in particular, it can involve radiant tubes, an electrical heating unit, a flame heating unit, a flame in a jacket radiant tube, some other kind of burner, or an inductor. This heating device 2 acts on the surface of the band 1 .
  • the heating device 2 is, for example, an inductor, which can in particular be moved in the direction of arrow 7 toward the surface of the steel band and away from it.
  • devices 8 are provided, which maintain a constant heat in the zones Z 1 and Z 3 that are not supposed to be heated or that are supposed to be heated less. This happens by virtue of the fact that in these regions, heat, which has been brought by the heating device 2 into the zone Z 2 and is discharged into the zones Z 1 and Z 3 , is introduced into the devices 8 due to thermal conduction and due to a thermal capacity that is as high as possible so that a heat flow from the zone Z 2 and/or the heating device 2 that flows into the zones Z 1 and Z 3 is absorbed by the devices 8 .
  • the devices 8 in this case can, for example, be solid objects, which rest against the sheet metal band 1 from beneath, in particular cooling elements made of suitable alloys such as an amco alloy; it is also possible for a cooling liquid to flow through these cooling elements.
  • the devices 8 can also be embodied as cooling rollers 8 , which rotate along with the steel sheet band 1 and in this way, on the one hand, absorb the heat and on the other hand, are able to possible dissipate it to suitable cooling devices on the underside.
  • Non-homogeneous temperature distributions in steel sheet bands are to be feared because they result in corresponding occurrences of waviness, and fluttering of the band.
  • these occurrences of waviness can be compensated for—particularly after the zonal heating and before the zonal cooling—by providing corresponding; guides, the band can be stabilized, and band flutter can thus be counteracted, without suppressing the waviness by means of pressure with smooth rollers, which can result in cracks in the edge regions of the steel sheet band 1 .
  • a heating in zone Z 1 causes a thermal expansion to take place there, which results in the fact that the band lines up in an edge region 9 .
  • a guide roller 10 assumes this waviness from the basic shape and correspondingly, is likewise embodied as curved.
  • a corresponding roller (not shown can be provided on the top side of the band.
  • FIGS. 3 to 5 the steel belt 1 is respectively shown spaced apart from the roller 10 in order to illustrate the layers; in practice, the steel band naturally must rest against the roller.
  • a middle region i.e. a zone Z 2
  • a convex roller 10 according to FIG. 5 a second roller, which is embodied as concave in accordance with the convexity of the roller 10 (not shown), can be provided in order for the band to be guided above and below.
  • a roller 10 according to FIG. 5 which is embodied as raised or convex, can also be used if zones Z 1 and Z 3 are acted on with heat, in which case, the convexity in the region of zone Z 2 is then somewhat flatter.
  • the rollers 10 can be composed of a material that retains the heat if need be after a start-up phase and keeps an outflow of heat to a minimum.
  • the rollers 10 can be composed of a ceramic material or of a steel material with a ceramic coating; they can also be provided with a heating medium that flows through them.
  • the different rollers 10 for reacting to a different number of heated zones Z 1 , Z 2 , and Z 3 or different positions thereof can be positioned in revolver stand fashion in the corresponding device for continuous heating or heat-treatment so that these rollers can be pivoted from an idle position into a working position and can be immobilized there, while the previous roller is pivoted out of the working position and into the idle position.
  • these convex or formed guide rollers for wavy bands can be positioned after a heating device 2 and before a cooling device (not shown) in order to support the wavy band and also to control the waviness as needed and to act on the band in corresponding fashion.
  • this heating device and the cooling device be situated between the deflection rollers of a corresponding loop-forming system. If the waviness extends across a deflection roller of such a system, then according to the invention, the deflection roller that deflects the still-wavy band, is also embodied as correspondingly convex.
  • a band steel with the following composition (all values in percent by weight)
  • remainder iron and melting-related impurities has a fully martensitic structure and is to be processed in a profiling system.
  • this band is zonally heated and cooled again, as a result of which, the band is annealed in the zone that has been heated and cooled again and is cooled in such a way that it becomes more ductile in this region.
  • the band is guided through a heating device according to the invention; the band first leaves a guide roller in loop-former, is then zonally subjected to inductive heating and subsequently cooled.
  • the band travels through a pass, i.e. two deflection rollers, for 20 meters at a speed of 2 m/s, i.e. in 10 seconds; in this case, the band is heated from 20° C. to 370° C. and is then cooled again.
  • the tensile strength After the exit from the pass in the corresponding zone, the tensile strength has decreased by 200 MPa.
  • the steel band has a thickness of 2 mm and consequently, this reduction in the tensile strength will be present across the entire band thickness.
  • the method according to the invention can also be used for other steel alloys, see the sample compositions in Table 1.
  • Table 2 shows the respective tensile strength at an annealing temperature (in the band) of 350° C. to 500° C.
  • alloy E for example, at an annealing temperature of 350° C., a tensile strength of 1550 MPa is achieved.
  • a zonal width region of for example 250 mm of the right band region is heated with induction to the 500° C. annealing temperature, then in this band region, a tensile strength of 1520 MPa, i.e. a reduction of 130 MPa, can be achieved.
  • Another exemplary embodiment is the intentional annealing, of three narrow strips of 20 mm each in order to enable a selective deformation of the component produced from the band (usual band width approx. 1800 mm) for the sake of improved energy absorption in the event of a crash.
  • induction coils are used to anneal each of the narrow regions across the entire band thickness. The heating and cooling take place within one band pass.
  • This invention can advantageously be used not only with three zones, but also with a larger or smaller number of zones with different heating states and mechanical properties.
  • the invention relates to a method in which in at least one zone that is to be heated, the hand has a difference in the tensile strength of at least 30 MPa and in particular 50 MPa.
  • the invention also relates to a method in which in the one or more zones to be heated, the band has a difference in the tensile strength of at least 5%, in particular 10%, of the tensile strength of the untreated region.
  • the invention also relates to a method in which the one or more zones to be heated has/have a width of at least 20 mm.
US15/515,972 2014-09-30 2015-09-23 Method for producing metal band material with different mechanical properties across the width of the band Abandoned US20170298463A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP14187040.2A EP3002343A1 (de) 2014-09-30 2014-09-30 Verfahren zum Ausbilden eines Stahlbandes mit unterschiedlichen mechanischen Eigenschaften über die Breite des Bandes
DE14187040.2 2014-09-30
PCT/EP2015/071899 WO2016050587A1 (de) 2014-09-30 2015-09-23 Verfahren zum ausbilden eines stahlbandes mit unterschiedlichen mechanischen eigenschaften über die breite des bandes

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EP (2) EP3002343A1 (de)
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US2029037A (en) * 1932-03-03 1936-01-28 Western Electric Co Processing of metal parts
US3078747A (en) * 1957-09-17 1963-02-26 British Aluminium Co Ltd Manufacture of metal sheet or strip
US20100175452A1 (en) * 2007-06-22 2010-07-15 Joachim Ohlert Method for hot rolling and for heat treatment of a steel strip
US20120291928A1 (en) * 2010-01-29 2012-11-22 Tata Steel Nederland Technology Bv Process for the Heat Treatment of Metal Strip Material, and Strip Material Produced in that Way

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019222988A1 (zh) * 2018-05-25 2019-11-28 南京钢铁股份有限公司 一种屈服强度1100MPa级超细晶高强钢板及其制造方法

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