WO2005090627A1 - Feuille d'acier faiblement allie a forte teneur en cuivre - Google Patents

Feuille d'acier faiblement allie a forte teneur en cuivre Download PDF

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Publication number
WO2005090627A1
WO2005090627A1 PCT/AU2005/000402 AU2005000402W WO2005090627A1 WO 2005090627 A1 WO2005090627 A1 WO 2005090627A1 AU 2005000402 W AU2005000402 W AU 2005000402W WO 2005090627 A1 WO2005090627 A1 WO 2005090627A1
Authority
WO
WIPO (PCT)
Prior art keywords
less
alloy steel
low alloy
steel sheet
thickness
Prior art date
Application number
PCT/AU2005/000402
Other languages
English (en)
Other versions
WO2005090627A9 (fr
Inventor
Mary Alwin
Original Assignee
Nucor Corporation
Ishikawajima-Harima Heavy Industries Company Limited
Bluescope Steel Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US10/805,831 external-priority patent/US20050205169A1/en
Application filed by Nucor Corporation, Ishikawajima-Harima Heavy Industries Company Limited, Bluescope Steel Limited filed Critical Nucor Corporation
Priority to AU2005224290A priority Critical patent/AU2005224290A1/en
Priority to EP05714274A priority patent/EP1727918A4/fr
Priority to JP2007504210A priority patent/JP2007529630A/ja
Publication of WO2005090627A1 publication Critical patent/WO2005090627A1/fr
Publication of WO2005090627A9 publication Critical patent/WO2005090627A9/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • 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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper

Definitions

  • TECHNICAL FIELD Previously high copper low-alloy steel sheet was known and was known to provide corrosion resistance; however, such low alloy steel containing about 0.50% or more of copper frequently exhibited "hot shortness" during hot working, so that cracks or extremely roughened surfaces, sometimes referred to as “checking,” may develop during hot deformation. See, The Making, Shaping and Treating of Steel (9 th edition) at page 1154. Hot shortness occurs by copper separating during surface oxidation from the oxidizing layer to a layer adjacent the surface of the produced sheet resulting in a commercially unacceptable steel. The occurrence of these undesirable surface conditions could be minimized by careful control of oxidation during heating and taking care not to overheat during hot working.
  • nickel in an amount equal to at least one-half the copper content has been known to be very beneficial to the surface quality of steels containing copper.
  • these procedures and alloying additions were expensive and caused the resulting corrosion resistant steels to be expensive.
  • nickel is an expensive alloy addition and causes the resulting corrosion resistant steel to be expensive.
  • Copper, in the concentrations used, was known to be the most potent of all common alloying elements in improving atmospheric-corrosion resistance in carbon steels. Copper was known to be especially effective in amounts up to about 0.35% in regular carbon steel. As noted, the steels with about 0.50% or more copper presented the problem of hot shortness.
  • Steel scrap has been traditionally separated by copper content to less than 0.15% by weight copper, greater than or equal to 0.15% to up to 0.5% by weight copper, and above 0.5% by weight.
  • Scrap with copper content above 0.5% copper could be mixed with scrap with low copper levels to make an acceptable scrap, which also added to the cost of the scrap commercially available.
  • the scrap which was low copper below 0.15% by weight is the highest cost scrap, with the other two grades of scrap being of less cost.
  • scrap grades with copper content up to 0.5% were useful in electric arc furnaces servicing bar mills, or at considerable expense by mixing with scrap of lower copper content to reduce the overall copper content of the scrap to less than 0.15%.
  • low alloy steel a steel having between 0.02 % and 0.3% carbon, between 0.10% and 1.5% manganese, between 0.01% and 0.5% silicon, between 0.002 and 0.0095% sulfur, greater than 0.01 % and less than or equal to 0.15% phosphorus, less than 0.05% aluminum, at least 0.20% copper, less than 0.03 % tin, and less than 0.10 % nickel.
  • the copper content of the high copper low alloy steel may be between 0.20 % and 2.0 %.
  • a non-oxidizing atmosphere is an atmosphere typically of an inert gas such as nitrogen or argon, or a mixture thereof, that contains less than about 5% oxygen by weight.
  • the high copper low alloy steel sheet may be made by the steps comprising: (a) preparing a molten melt producing an as-cast low alloy steel comprising (i) by weight, between 0.02 % and 0.3% carbon, between
  • manganese between 0.01 % and 0.5% silicon, between 0.002 and 0.0095% sulfur, greater than 0.01 % and less than or equal to 0.15 % phosphorus, less than 0.05% aluminum, more than 0.20% copper, less than 0.03 % tin, and less than 0.10% nickel; (ii) the remainder iron and impurities resulting from melting; (b) solidifying and cooling the molten melt into a sheet less than 10 mm in thickness in a non-oxidizing atmosphere to below 1080 °C.
  • the high copper low alloy steel sheet may also be made by the steps comprising: (a) preparing a molten melt producing an as-cast low alloy steel comprising (i) by weight percent, between 0.02% and 0.3% carbon, between 0.10% and 1.5% manganese, between 0.01 % and 0.5% silicon, between 0.002% and 0.0095% sulfur, greater than 0.01 % and less than or equal to 0.15 % phosphorus, less than 0.05% aluminum, more than 0.20% copper, less than 0.03 % tin, and less than 0.05% nickel; (ii) the remainder iron and impurities resulting from melting; (b) forming the melt into a casting pool supported on casting surfaces of a pair of cooled casting rolls having a nip therebetween; (c) counter rotating the casting rolls to form a thin cast sheet or strip of less than 10 millimeters in thickness extending downwardly from the nip; and (d) cooling the cast strip to below 1080 °C in a non-oxidizing atmosphere.
  • the thickness of the high copper low alloy steel sheet (or strip)produced may be less than 5 mm in thickness or less than 2 mm in thickness.
  • the copper content of the high copper low alloy steel may be between 0.20 % and 2.0 %.
  • non- oxidizing atmosphere is an atmosphere typically of an inert gas such as nitrogen or argon, or a mixture thereof, that contains less than about 5% oxygen by weight.
  • a high copper low alloy steel of less than 10 mm in thickness made by a particular method.
  • a twin roll caster may be used in making the high copper low alloy steel by the disclosed method as described in more detail below.
  • the high copper low alloy steel strip may be less than 5 mm in thickness or less than 2 mm in thickness.
  • Figures 1 and 2 are micrographs illustrating hot shortness experienced in the prior art with corrosion resistant low alloy steel made by thin slab casting
  • Figure 3 is a diagrammatic side elevation view of an illustrative twin roll strip caster
  • Figure 4 is an enlarged sectional view of a portion of the illustrative caster of
  • Figure 3 is a graph showing the benefits of the high copper low alloy steel of the present invention compared to prior low alloy steel with copper additions;
  • Figures 6 and 7 are micrographs showing the surface of high copper low alloy steel sheet of 1.7 mm in thickness made by thin strip casting, showing the inhibiting of hot shortness.
  • FIGS 3 and 4 illustrate a twin roll continuous strip caster which has been operated in making high copper low alloy steel strip in accordance with the present invention.
  • the following description of the described embodiments is in the context of continuous casting steel strip using a twin roll caster.
  • the present invention is not limited, however, to the use of twin roll casters and extends to other types of continuous strip casters and other ways of making steel sheet.
  • Figure 3 shows successive parts of an illustrative production line whereby steel sheet (or strip) can be produced in accordance with a twin roll caster.
  • FIGS 3 and 4 illustrate a twin roll caster denoted generally as 11 which produces a cast steel strip 12 that passes in a transit path 10 across a guide table 13 to a pinch roll stand 14 comprising pinch rolls 14A.
  • the strip optionally may be passed into a hot rolling mill 16 comprising a pair of reduction rolls 16A and backing rolls 16B by which it is hot rolled to reduce its thickness.
  • the rolled strip passes onto a run-out table 17 on which it may be cooled by convection and/or by contact with water supplied via water jets 18 (or other suitable means) and by radiation.
  • twin roll caster 11 comprises a main machine frame 21 which supports a pair of horizontally positioned casting rolls 22 each having casting surfaces 22A, assembled side-by-side with a nip 27 between them.
  • Molten metal may be supplied during a casting operation from a ladle (not shown) to a tundish 23, through a refractory shroud 24 to a distributor 25 (also called a removable tundish) and thence through a metal delivery nozzle 26 generally above the nip 27 between the casting rolls 22.
  • Molten metal thus delivered to the nip 27 forms a casting pool 30 above the nip 27 supported on the casting roll surfaces 22A.
  • This casting pool is confined at the ends of the rolls typically by a pair of side closure dams or plates 28, which may be positioned adjacent the ends of the rolls by a pair of thrusters (not shown) comprising hydraulic cylinder units (or other suitable means) connected to the side plate holders.
  • the upper surface of casting pool 30 (generally referred to as the "meniscus" level) may rise above the lower end of the delivery nozzle 26 so that the lower end of the delivery nozzle is immersed within this casting pool.
  • Casting rolls 22 are internally cooled by water or other suitable coolant so that shells of steel solidify on the moving casting surfaces 22A of the rolls 22 during rotation of the rolls.
  • frame 21 supports a casting roll carriage which is horizontally movable between an assembly station and a casting station.
  • Casting rolls 22 are counter-rotated through drive shafts (not shown) driven by an electric motor and transmission.
  • Rolls 22 have copper peripheral walls formed with a series of longitudinally extending and circumferentially spaced cooling passages supplied with coolant. The rolls may typically be about 500 mm in diameter and generally up to about 2000 mm long, in order to produce strip product of about 2000 mm wide.
  • Removable tundish 25 is of conventional construction.
  • Delivery nozzle 26 is formed as an elongate body made of a refractory material such as for example alumina graphite. Its lower part is tapered so as to converge inwardly and downwardly above the nip between casting rolls 22.
  • Nozzle 26 may have a series of horizontally spaced generally vertically extending flow passages to produce a suitably low velocity discharge of molten metal throughout the width of the casting rolls 22 and to deliver the molten metal onto the roll surfaces 22A of the rolls 22 where initial solidification occurs.
  • the nozzle 26 may have a single continuous slot outlet to deliver a low velocity curtain of molten metal directly above the nip between the rolls.
  • the nozzle may be immersed in the molten metal pool 30.
  • the casting pool 30 is confined at the ends of the rolls by a pair of side closure plates 28 which are adjacent to and held against stepped ends of the rolls 22 when the roll carriage is at the casting station.
  • Side closure plates 28 are illustratively made of a strong refractory material, for example boron nitride, and have scalloped side edges to match the curvature of the stepped ends of the rolls 22.
  • the side plates 28 can be mounted in plate holders which are movable at the casting station by actuation of a pair of hydraulic cylinder units (or other suitable means) to bring the side plates into engagement with the stepped ends of the casting rolls 22 to form end closures for the casting pool 30 of metal supported on the casting roll surfaces 22A during a casting operation.
  • the twin roll caster may be of the kind illustrated and described in some detail in, for example, United States Patent Nos.
  • the steel strip had the following chemical composition: 0.048% carbon, 0.636% manganese, 0.117% phosphorus, 0.005% sulfur, 0.252% silicon, 0.261% copper, 0.034% nickel, 0.027% chromium, 0.015% molybdenum, 0.006% tin, 0.001 % aluminium, 0.001% titanium, 0.001% zinc, 0.0072% nitrogen and other impurities normally found in steel scrap.
  • the steel was also tested and not found to have any measurable amounts of vanadium, lead, calcium or boron. This steel was designated heat #232613 (trial #1), and was made into four coils ( i.e., numbers 1 ,2,3 and 4) which were tested.
  • a second high copper low-alloy steel sheet was made by twin-roll caster into thin cast strip of 1.7 mm in thickness.
  • the steel strip had the following chemical composition: 0.049% carbon, 0.554% manganese, 0.043% phosphorus, 0.009% sulfur, 0.227% silicon, 0.417% copper, 0.030% nickel, 0.067% chromium, 0.011% molybdenum, 0.005% tin, 0.001% aluminium, 0.001% lead, 0.001% titanium, 0.001% zinc, 0.0065% nitrogen and other impurities normally found in steel scrap.
  • the composition was also tested for vanadium, niobium, calcium and boron and none were measured.
  • This steel was designated heat #137162 (trial #2), and was made into four coils ( i.e., numbers 1 ,2,3 and 5) which were tested. There was not a roll #4 tested, because it was a pup. The coils from Trials 1 and 2 were tested and the results are shown in Table 1 below.
  • the sulfur content in the first steel strip was 0.005% and the sulfur content in the second steel strip was 0.009%.
  • the sulfur level may be between 0.003 and 0.009%.
  • Figure 5 shows the dramatic improvement in inhibiting hot shortness with the high copper low alloy steel sheet of the present invention.
  • the solid line illustrates the tolerance of prior art sheet to hot shortness as a function of percent copper from available data.
  • the dotted line is an extension of the solid line showing the projected levels of copper that can be tolerated without hot shortness in sheet below 10 mm in thickness As can be seen from Figure 5, those copper levels are below 0.15 % and closer to and below 0.1%.
  • FIGS. 6 and 7 are micrographs of the surfaces of the high copper low alloy sheet or strip showing an absence of hot shortness. The benefits in inhibiting hot shortness are most evident by comparing Figures 6 and 7 with Figures 1 and 2 above.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)

Abstract

L'invention a trait à un procédé permettant de fabriquer une feuille d'acier faiblement allié à forte teneur en cuivre, qui comprend les étapes consistant : à préparer un bain fondu produisant un acier faiblement allié brut de coulée contenant de 0,02 à 0,3 % poids de carbone, de 0,1 à 1,5 % poids de manganèse, de 0,01 à 0,5 % poids de silicium, de 0,002 à 0,0095 % poids de soufre, une quantité supérieure à 0,01 % poids et inférieure ou égale à 0,15 % poids de phosphore, moins de 0,05 % poids d'aluminium, plus de 0,2 % poids de cuivre, moins de 0,03 % poids d'étain, et moins de 0,1 % poids de nickel, le solde étant constitué de fer et d'impuretés provenant de la fusion ; et à solidifier le bain fondu de manière à former une feuille présentant une épaisseur inférieure à 10 mm dans une atmosphère non oxydante à moins de 1080 °C. La teneur en cuivre peut être comprise entre 0,2 % et 2,0 % poids. L'acier faiblement allié à forte teneur en cuivre peut également présenter un indice de corrosion (I) d'au moins 6,0 conformément à la norme ASTM G101, étant entendu que : I = 26,01 ( % Cu) + 3,88 ( % Ni) + 1,20 ( % Cr) + 1,49 ( % Si) + 17,28 ( % P) 7,29 ( % Cu)( % Ni) 9,10 ( % Ni)( % P) 33,39 ( % Cu)2. L'acier faiblement allié à forte teneur en cuivre selon l'invention peut être produit par coulée entre cylindres, et peut présenter une épaisseur inférieure à 5 mm ou inférieure à 2 mm.
PCT/AU2005/000402 2004-03-22 2005-03-21 Feuille d'acier faiblement allie a forte teneur en cuivre WO2005090627A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU2005224290A AU2005224290A1 (en) 2004-03-22 2005-03-21 High copper low alloy steel sheet
EP05714274A EP1727918A4 (fr) 2004-03-22 2005-03-21 Feuille d'acier faiblement allie a forte teneur en cuivre
JP2007504210A JP2007529630A (ja) 2004-03-22 2005-03-21 高銅低合金鋼シート

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US10/805,831 US20050205169A1 (en) 2004-03-22 2004-03-22 High copper low alloy steel sheet
US10/805,831 2004-03-22
US11/084,649 US20050205170A1 (en) 2004-03-22 2005-03-19 High copper low alloy steel sheet
US11/084,649 2005-03-19

Publications (2)

Publication Number Publication Date
WO2005090627A1 true WO2005090627A1 (fr) 2005-09-29
WO2005090627A9 WO2005090627A9 (fr) 2005-11-17

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PCT/AU2005/000402 WO2005090627A1 (fr) 2004-03-22 2005-03-21 Feuille d'acier faiblement allie a forte teneur en cuivre

Country Status (8)

Country Link
US (1) US20050205170A1 (fr)
EP (1) EP1727918A4 (fr)
JP (1) JP2007529630A (fr)
KR (1) KR20060130745A (fr)
CN (1) CN1946867A (fr)
AU (1) AU2005224290A1 (fr)
RU (1) RU2006137274A (fr)
WO (1) WO2005090627A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009052551A1 (fr) * 2007-10-23 2009-04-30 Bluescope Steel Limited Tôle en acier faiblement allié à haute teneur en cuivre

Families Citing this family (7)

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Publication number Priority date Publication date Assignee Title
WO2007079545A1 (fr) * 2006-01-16 2007-07-19 Nucor Corporation Bande d'acier coulé mince à microfissuration réduite
US20070175608A1 (en) * 2006-01-16 2007-08-02 Nucor Corporation Thin cast steel strip with reduced microcracking
US20100215981A1 (en) * 2009-02-20 2010-08-26 Nucor Corporation Hot rolled thin cast strip product and method for making the same
JP5352530B2 (ja) * 2010-05-24 2013-11-27 株式会社神戸製鋼所 鋼材の腐食状態推定方法
CN104057053B (zh) * 2013-06-14 2016-03-30 攀钢集团攀枝花钢铁研究院有限公司 一种低合金钢宽厚板坯的连铸方法
CN109338235A (zh) * 2017-09-27 2019-02-15 江苏沙钢集团有限公司 一种耐候钢及其生产方法
CN112522576B (zh) * 2019-09-19 2022-11-18 宝山钢铁股份有限公司 一种薄规格高耐蚀钢及其生产方法

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US5584337A (en) * 1994-03-25 1996-12-17 Nippon Steel Corporation Process for producing thin cast strip
US5651412A (en) * 1995-10-06 1997-07-29 Armco Inc. Strip casting with fluxing agent applied to casting roll
US5720335A (en) * 1995-12-22 1998-02-24 Ishikawajima-Harima Heavy Industries Company Limited Twin roll continuous caster
WO2003023074A1 (fr) * 2001-09-13 2003-03-20 Ak Properties, Inc. Procédé de coulée continue d'une bande d'acier électrique grâce au refroidissement par pulvérisation contrôlé
US6536504B2 (en) * 2000-08-08 2003-03-25 Castrip, Llc Continuous strip casting device and method of use thereof

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JPH07100593A (ja) * 1993-10-06 1995-04-18 Nippon Steel Corp Ｃｕ，Ｓｎ含有鋼の双ロール連続鋳造方法
IT1290743B1 (it) * 1997-04-10 1998-12-10 Danieli Off Mecc Procedimento di laminazione per prodotti piani con spessori sottili e relativa linea di laminazione
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US5584337A (en) * 1994-03-25 1996-12-17 Nippon Steel Corporation Process for producing thin cast strip
US5651412A (en) * 1995-10-06 1997-07-29 Armco Inc. Strip casting with fluxing agent applied to casting roll
US5720335A (en) * 1995-12-22 1998-02-24 Ishikawajima-Harima Heavy Industries Company Limited Twin roll continuous caster
US6536504B2 (en) * 2000-08-08 2003-03-25 Castrip, Llc Continuous strip casting device and method of use thereof
WO2003023074A1 (fr) * 2001-09-13 2003-03-20 Ak Properties, Inc. Procédé de coulée continue d'une bande d'acier électrique grâce au refroidissement par pulvérisation contrôlé

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
WO2009052551A1 (fr) * 2007-10-23 2009-04-30 Bluescope Steel Limited Tôle en acier faiblement allié à haute teneur en cuivre

Also Published As

Publication number Publication date
EP1727918A4 (fr) 2007-08-29
US20050205170A1 (en) 2005-09-22
EP1727918A1 (fr) 2006-12-06
CN1946867A (zh) 2007-04-11
KR20060130745A (ko) 2006-12-19
JP2007529630A (ja) 2007-10-25
RU2006137274A (ru) 2008-04-27
AU2005224290A1 (en) 2005-09-29
WO2005090627A9 (fr) 2005-11-17

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