US20030164211A1 - Fe-ni or fe-ni-co or fe-ni-co-cu alloy strip with improved cuttability - Google Patents

Fe-ni or fe-ni-co or fe-ni-co-cu alloy strip with improved cuttability Download PDF

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Publication number
US20030164211A1
US20030164211A1 US10/332,507 US33250703A US2003164211A1 US 20030164211 A1 US20030164211 A1 US 20030164211A1 US 33250703 A US33250703 A US 33250703A US 2003164211 A1 US2003164211 A1 US 2003164211A1
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United States
Prior art keywords
alloy
strip
less
strip according
mechanical cutting
Prior art date
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Abandoned
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US10/332,507
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English (en)
Inventor
Lucien Coutu
Vincent Durieux
Jerome Giusti
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Individual
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Individual
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    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • 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
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • 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
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
    • C22C38/105—Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/001—Heat treatment of ferrous alloys containing Ni

Definitions

  • the present invention relates to the manufacture of parts made of an alloy of the Fe—Ni or Fe—Ni—Co or Fe—Ni—Co—Cu type obtained by the precision mechanical cutting of blanks, which may possibly be drawn beforehand. These parts are in general used in miniature electrical or electronic components.
  • the blanks from which the parts are cut are taken from generally isotropic or slightly textured strip obtained by cold-rolling and annealing.
  • the strip In the case of flat or almost flat parts, that is to say those obtained without appreciable plastic deformation of the blank, the strip is often used in the work-hardened state so as to have a higher hardness and a lower ductility than strip obtained directly after annealing. This higher hardness and lower ductility favour mechanical cutting.
  • the strip is used in the annealed state so as to have a high ductility and the ability to undergo extensive plastic deformation.
  • the cutting operation which is the drilling of a hole
  • the cutting operation is sometimes preceded by local work-hardening intended to reduce the ductility of the metal along the cutting line.
  • local work-hardening intended to reduce the ductility of the metal along the cutting line.
  • the subject of the invention is a strip made of an austenitic Fe—Ni alloy or Fe—Ni—Co alloy or Fe—Ni—Co—Cu alloy in which the chemical composition of the alloy comprises, in % by weight:
  • the balance being iron and impurities such as C, S, P, O and N; the chemical composition being such that Fe+Ni+Cu+Co ⁇ 95%.
  • the alloy has a cubic texture with a cubic texture index D c ⁇ 7.
  • the boron content is between 0.0007% and 0.004%
  • the D c index is greater than 10
  • the carbon content is less than or equal to 0.05%
  • the sulphur content is less than or equal to 0.01%
  • the oxygen content is less than 0.005%.
  • the invention also relates to a process for manufacturing a strip made of an Fe—Ni or Fe—Ni—Co or Fe—Ni—Co—Cu alloy in which:
  • a strip made of an alloy whose chemical composition is defined above is manufactured by cold-rolling with a deformation ratio of greater than 80%;
  • a complementary cold-rolling operation is carried out with a deformation ratio of less than 40%.
  • the invention relates to a process for manufacturing a part by mechanical cutting or by mechanical cutting and drawing, in which a blank is taken from a strip according to the invention and at least one mechanical cutting operation and optionally at least one drawing operation are carried out on the blank, it being possible for the at least one drawing operation to be carried out before or after the at least one mechanical cutting operation.
  • the part is, for example, an electron-gun part with a hole through which the electrons pass.
  • the part may also be a leadframe with connection leads.
  • the part may also be a magnetic core of a micromotor or transformer. This list of applications is not limiting.
  • FIG. 1- a represents, in schematic cross section, a strip in which a hole has been drilled by mechanical cutting, showing a cut surface corresponding to poor cuttability.
  • FIG. 1- b represents, in schematic cross section, a strip in which a hole has been drilled by mechanical cutting, having a cut surface corresponding to acceptable cuttability.
  • FIG. 1- c represents, in schematic cross section, a strip in which a hole has been drilled by mechanical cutting, having a cut surface corresponding to good cuttability.
  • the strip according to the invention is thin, cold-rolled strip (with a thickness in general of less than 1.5 mm) made of an alloy of the Fe—Ni or Fe—Ni—Co or Fe—Ni—Co—Cu type which are known per se in their most general form.
  • the nickel, or the cobalt which is a substitute for nickel, allows properties such as the thermal expansion coefficient or the magnetic permeability to be adjusted.
  • the nickel content is between 30% and 70%; the copper and cobalt contents are such that the sum Cu+2Co is less than or equal to 20%, these two elements being optional.
  • the balance is essentially iron, impurities, such as carbon, sulphur, phosphorus, oxygen and nitrogen, and possibly complementary alloying elements, such as manganese, chromium, tungsten, molybdenum, titanium, vanadium, niobium and aluminium.
  • the iron, nickel, copper and cobalt contents must be such that: Fe+Ni+Cu+Co ⁇ 95%.
  • the contents of the alloying elements must be such that: Mn+Cr ⁇ 5%, W+2Mo ⁇ 2% and Ti+V+Nb+Al ⁇ 1%.
  • Certain impurities, such as carbon, sulphur and oxygen which are in the form of inclusions may be desirable in small amounts since they have a favourable effect on cuttability. Nevertheless, the carbon content, must, preferably, remain less than 0.05%, the sulphur content must preferably remain less than 0.01%, and better still less than 0.007%, and the oxygen content must, preferably, remain less that 0.005%.
  • the alloy contains from 0.0005% to 0.007%, and preferably from 0.0007% to 0.004%, boron and has a (001) ⁇ 100> cubic texture characterized by a cubic texture index D c of greater than 7, and preferably greater than 10. This is because the inventors have found, surprisingly, that an addition of boron combined with a highly pronounced cubic texture very substantially improves the mechanical cutting capability of alloys of the Fe—Ni or Fe—Ni—Co or Fe—Ni—Co—Cu type.
  • the cubic texture index D c is the ratio, I cubic /I isotropic , of the maximum reflected X-ray intensities, measured on a (111) pole figure at a point located at 54°44′ from the centre of the figure and along the line at 45° to the rolling direction for a specimen of the strip to be characterized on the one hand and for an isotropic specimen on the other.
  • the degree of texture of a strip may also be evaluated simply but approximately by a drawing test by measuring the drawing ears. This method can be used only to characterize a sufficiently ductile metal. To use this test, it is possible, for example, to start with a 60 mm diameter disc, to draw this disc so as to form a cup 33 mm in diameter and 19 mm in height on average. The difference in height between the highest points and the lowest points of the upper edge is then measured. If this height difference is less than 0.3 mm, the strip is isotropic or has very little texture; if this difference is greater than 1.5 mm, the strip has a highly pronounced texture.
  • the alloy is smelted, cast and hot-rolled in a manner known per se so as to obtain a hot strip of sufficient thickness to allow a cold strip having the desired thickness to be obtained by cold-rolling with a reduction ratio of greater than 80%, and better still greater than 90%.
  • the thickness of the hot-rolled strip may, for example, be 5 mm.
  • the cold rolling must be carried out without intermediate annealing, but may be preceded by an annealing step. This is the case, in particular, when, on account of the thickness of the hot strip and the intended thickness for the cold strip, it is necessary to carry out several successive cold-rolling passes.
  • the final cold-rolling pass (with a reduction ratio of greater than 80%) is followed by a recrystallization annealing step generally carried out in a tunnel furnace in a protective atmosphere consisting, for example, of a mixture of hydrogen and nitrogen with a dew point below ⁇ 40° C.
  • the temperature of the oven about 1000° C., must be sufficient to obtain fine-grain recrystallization, but not too high in order to prevent undesirable coarse-grain secondary recrystallization.
  • the duration of the annealing step is in general around one minute. Those skilled in the art will know how to adapt, on a case-by-case basis, the precise annealing conditions so as to obtain fine-grain recrystallization while avoiding secondary recrystallization.
  • the recrystallization annealing may be followed by complementary cold-rolling with a reduction ratio of less than 50° or better still less than 30°, in order not to excessively degrade the initial cubic texture.
  • the reduction ratio of the complementary cold-rolling is less than 10%, a cold strip, softened or slightly work-hardened, having a pronounced cubic texture is obtained.
  • the reduction ratio of the complementary cold rolling is greater than 10%, a work-hardened cold strip with a pronounced cubic texture is obtained.
  • the cold-rolled strips obtained have a thickness generally of less than 0.5 mm.
  • a blank is cut by mechanical cutting in a manner known per se.
  • the blank may either be the finished part, which is then flat, or a preform.
  • the preform may be formed by drawing and then cut again by mechanical cutting. This cutting may, for example, be a drilling operation. This cutting operation may be preceded by a local work-hardening step.
  • the strip can be used after a complementary cold-rolling operation with a reduction ratio of between 10% and 30%, or even 50%. This is the case, for example, for flat parts for electron guns of colour display cathode-ray tubes, or for leadframes having connection leads, or for rotors or stators of electric micromotors.
  • the strip When the part is highly deformed, by drawing or by bending or by a local thickness reduction, that is to say with deformation ratios of greater than 20%, the strip is used in the softened or slightly work-hardened state, that is to say without complementary cold-rolling or with complementary cold-rolling having a reduction ratio of less than 10%. This is the case, for example, for certain electron-gun parts for colour display cathode-ray tubes.
  • the quality of the cutting is assessed by the cut surface, which comprises a sheared region and a torn region.
  • the line of demarcation between these two regions must be regular and located at approximately mid-thickness. There must not be any burrs.
  • FIGS. 1 a , 1 b and 1 c Three cut surfaces are shown in FIGS. 1 a , 1 b and 1 c . These surfaces are those observed around a hole 1 a , 1 b and 1 c , drilled in a strip 2 a , 2 b and 2 c by punching. Only one half of each hole is shown after sectioning the strips in a plane passing through the axis of the holes.
  • the walls 3 a , 3 b and 3 c of the holes each have a sheared region 4 a , 4 b and 4 c and a torn region 5 a , 5 b and 5 c.
  • FIG. 1 a corresponds to a strip of an alloy having poor cuttability.
  • the sheared region 3 a corresponds to most of the thickness and it terminates near the bottom, in substantial burrs 6 a.
  • FIG. 1 b corresponds to a strip of an alloy having a cuttability which is just acceptable.
  • the sheared region 3 b corresponds roughly to half the thickness and terminates, near the bottom, in a few burrs 6 b.
  • FIG. 1 c corresponds to a strip of an alloy having excellent cuttability.
  • the sheared region 3 c corresponds to roughly half the thickness and has no burrs.
  • the quality of the cutting can also be assessed by the geometrical quality of the parts obtained.
  • the assessment of the cutting quality takes into account how circular the hole is.
  • Alloys PV588 and PW075 have compositions in accordance with the invention while alloy PV408 is given by way of comparison.
  • Cold strips were produced from these hot strips according to 6 different manufacturing schemes, denoted A, B, C, D, E and F, comprising: a first cold-rolling pass with a deformation ratio DEF1, a tunnel-furnace recrystallization annealing step and a second cold-rolling pass with a deformation ratio DEF2.
  • the first deformation was in certain cases preceded by a preliminary deformation of the hot-rolled strip followed by a recrystallization annealing step in order to adjust the thickness to the desired value.
  • Leadframes were produced, by mechanical cutting, from the 0.25 mm thick strips corresponding to the three alloys and to manufacturing scheme D.
  • the PV408 alloy gave poor parts with significant burring.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Heat Treatment Of Steel (AREA)
  • Lead Frames For Integrated Circuits (AREA)
US10/332,507 2000-07-13 2001-07-10 Fe-ni or fe-ni-co or fe-ni-co-cu alloy strip with improved cuttability Abandoned US20030164211A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR00/09249 2000-07-13
FR0009249A FR2811684B1 (fr) 2000-07-13 2000-07-13 Bande en alliage fe-ni ou fe-ni-co ou fe-ni-co-cu a decoupabilite amelioree

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US20030164211A1 true US20030164211A1 (en) 2003-09-04

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US10/332,507 Abandoned US20030164211A1 (en) 2000-07-13 2001-07-10 Fe-ni or fe-ni-co or fe-ni-co-cu alloy strip with improved cuttability

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US (1) US20030164211A1 (de)
EP (1) EP1299568A1 (de)
JP (1) JP2004517205A (de)
KR (1) KR20030026966A (de)
AU (1) AU2001277569A1 (de)
FR (1) FR2811684B1 (de)
WO (1) WO2002006548A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2836155B1 (fr) * 2002-02-15 2005-01-07 Imphy Ugine Precision Alliage magnetique doux pour horlogerie
CN111979502B (zh) * 2020-07-06 2021-09-10 河南师范大学 一种高强度织构金属基带的制备方法
JP7413600B1 (ja) 2023-09-19 2024-01-15 日本冶金工業株式会社 Ｆｅ－Ｎｉ系合金板及びその製造方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5532088A (en) * 1993-03-12 1996-07-02 Kabushiki Kaisha Toshiba Shadow mask plate material and shadow mask
US5783145A (en) * 1996-02-27 1998-07-21 Imphy S.A. Iron-nickel alloy and cold-rolled strip with a cubic texture

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69207482T2 (de) * 1991-05-30 1996-05-30 Hitachi Metals Ltd Werkstoff für Lochmaske mit hoher Schärfe und Verfahren zu seiner Herstellung
JP2871414B2 (ja) * 1993-08-27 1999-03-17 日本鋼管株式会社 プレス成形性に優れたシャドウマスク用合金薄板およびその製造方法
JP3401307B2 (ja) * 1993-11-29 2003-04-28 日新製鋼株式会社 再結晶特性に優れたシャドウマスク用材料及び製造方法
JPH09209088A (ja) * 1996-02-08 1997-08-12 Nisshin Steel Co Ltd すじむら発生のないシャドウマスク用素材およびその製造方法
JPH1017998A (ja) * 1996-07-02 1998-01-20 Nikko Kinzoku Kk 打ち抜き性良好な電子銃部品用Ｆｅ−Ｎｉ系合金素材及びその製造方法並びに加工部品

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5532088A (en) * 1993-03-12 1996-07-02 Kabushiki Kaisha Toshiba Shadow mask plate material and shadow mask
US5783145A (en) * 1996-02-27 1998-07-21 Imphy S.A. Iron-nickel alloy and cold-rolled strip with a cubic texture

Also Published As

Publication number Publication date
AU2001277569A1 (en) 2002-01-30
JP2004517205A (ja) 2004-06-10
FR2811684B1 (fr) 2002-08-30
FR2811684A1 (fr) 2002-01-18
WO2002006548A1 (fr) 2002-01-24
KR20030026966A (ko) 2003-04-03
EP1299568A1 (de) 2003-04-09

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