US3680623A - Improvements in or relating to processes of manufacturing rolled stock from products of continuous casting processes - Google Patents

Improvements in or relating to processes of manufacturing rolled stock from products of continuous casting processes Download PDF

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Publication number
US3680623A
US3680623A US847816A US3680623DA US3680623A US 3680623 A US3680623 A US 3680623A US 847816 A US847816 A US 847816A US 3680623D A US3680623D A US 3680623DA US 3680623 A US3680623 A US 3680623A
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United States
Prior art keywords
rolls
pair
product
rolling operation
set forth
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Expired - Lifetime
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US847816A
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English (en)
Inventor
Bruno Tarmann
Heinrich Vonbank
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Gebrueder Boehler and Co AG
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Gebrueder Boehler and Co AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/463—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing
    • B22D11/1282—Vertical casting and curving the cast stock to the horizontal

Definitions

  • Klein ABSTRACT A process for making rolled stock directly from strands of continuously cast steel products in a working and forming installation, comprising two pairs of rolls which are respectively mounted in spaced relationship to each other along the path through which the strand travels. The distance. between the rolls of each pair of rolls being adjusted so that the mass flow rate of said strand immediately upstream from the first pair of rolls being at least 0.5 percent larger than the mass flow rate of said strand immediately downstream from said first pair of rolls, while the mass flow rate g immediately upstream and downstream from the i second pair of rolls is substantially the same.
  • the present invention relates to a process of manufacturing rolled stock.
  • a continuous casting is subjected to two successive rolling operations which are controlled so that the mass flow rate of the casting immediately before the first rolling operation is at least 0.5 percent higher than immediately after said first rolling operation, the mass flow rate of said casting is the same before and after the second rolling operation, and the second rolling operation reduces the cross-sectional area of the casting by at least percent.
  • the process may be carried out immediately after a continuous casting operation so that the casting contains a molten core immediately before the first rolling operation.
  • the process may be applied to the manufacture of billets, slabs and sheet bars made from various types of steels, such as plain carbon and alloy structural and tool steels, spring steels, stainless and acid-resisting steels.
  • the mass flow rate referred to hereinabove is equal to the product of the cross-sectional area of the strand and the linear velocity of the strand.
  • the present invention is based on the observation that continuous castings can be shaped with the aid of two pairs of rolls, which pairs are spaced in the axial direction of the casting, to produce rolled stock which is particularly free of internal flaws and which has desirable properties in other respects too.
  • the product of the cross-sectional area of the casting and the velocity of the casting before the first pair of rolls must be at least 0.5 percent larger than behind this first pair of rolls and this product must be equal before and behind the second pair of rolls, which efi'ect a reduction in cross-section by at least 10 percent.
  • the invention relates to a process of making rolled stock directly from products of continuous casting processes with the aid of two pairs of rolls, and the invention resides in that the two pairs of rolls which are spaced apart in the direction of the axis of the product are set so that the product of the cross-sectional area of the material and the velocity of the material immediately before the first pair of rolls is at least 0.5 percent larger than immediately behind said first pair, and said product is the same before and behind the second pair of rolls, which eflects a reduction in cross-section by at least 10 percent.
  • the process according to the invention is preferably carried out at a time when the temperature in the interior of the casting is still close to the solidus temperature whereas the surface of the continuous casting has already reached the usual rolling temperature.
  • this temperature distribution promotes a reliable welding and elimination of the internal flaws.
  • the solidus temperature in the interior of the cast strand can, of course, not be exactly measured during a casting operation.
  • close to the solidus temperature is meant that the interior of the cast strand has a temperature range the upper limit of which is defined by the liquidus temperature and the lower limit of which is defined by a temperature not more than C. under the solidus temperature of the steel of the cast strand.
  • the aforedescribed two temperature limits are completely defined for all types of steel and will be easily ascertainable to a man skilled in the art.
  • the temperatures of the surface of the cast strand can, of course, be exactly measured and these temperatures, in the process of this invention, should be as follows: for the edges of the cast strand (assuming, of course, that a strand having edges is being cast) should be in the range of about between l,050 l,250 C. Thetemperature on the even surfaces of the cast strand should be about 30 50 C. higher.
  • the product of the cross-sectional area of the material and the velocity of the material before the first pair of rolls i.e.: the mass flow rate, is preferably 5 25 percent larger than behind the first pair of rolls.
  • molten steel is supplied to the top end of a mold l, which is, for example, square.
  • a mold l which is, for example, square.
  • the guide rollers, means for a direct cooling of the casting and means for controlling the surface temperature of the casting are ar ranged along this path. These means are known per se and are not shown on the drawing. Behind these various means, the casting moves in succession past the sensing unit 3, the pair of rolls 6, the sensing unit 4, the
  • sensing units 3, 4, and 5 serve for a rapid sensing of the cross-sectional area and velocity of the casting at their respective locations.
  • the sensing units 3, 4, and 5 are preferably provided with computers, not shown, for computing the product of the cross-sectional area and velocity of the casting at the respective location, and with means for indicating said product.
  • the respective diameters of the pair of rolls 6 and 7 should be 2 4 times, and preferably 2 as times, as large as the thickness, respectively diameter, of the cast strand.
  • the types of rolls used in the process of this invention are not of the usual caliber rolls, but rolls having a relatively smooth surface.
  • the distance between the pairs of rolls 6 and 7 should be at least 6 times and not more than 12 times the thickness, i.e. diameter, of the strand. I As soon as the starter bar, which hasbeen used in known manner for initiating the casting operation, has
  • the pair of rolls 6 are screwed down further so that the clearance between the two rolls is further reduced, and the pair of rolls 7 are sufficiently readjusted to ensure a reduction in cross-section by at least 10 percent by this pair of rolls.
  • the abovementioned products at the locations of the several sensing units are compared once more. This sequence of operations is repeated until the abovementioned products at the 10- cations of the sensing units 4 and 5 arethe same and are smaller by at least 0.5 percent than the corresponding product at the location of the sensing unit 3.
  • the shaping operation effected by the pair of rolls 6 can be relied upon to eliminate all voids and to squeeze out any residual molten metal so that the reduction in cross-section of the casting by at least 10 percent to which the casting is subjected when passing between the rolls 7 will not result in a further compaction of the casting.
  • the process according to the invention enables a simple and quick adjustrnent of the conditions under which continuous castings can be directly rolled, depending on the properties of the continuous casting, so as to obtain rolled stock having asatisfactory, dense structure.
  • said first rolling operation taking place at a point where the interior of the casting is still close to the solidus temperature while the surface of the casting has already reached the usual rolling temperature;
  • adjustable controlling said rolling operations by adjusting the respective clearances between the rolls of said first and second pair of rolls so that the mass flow rate of said product immediately before said first pair of rolls is at least 0.5 percent higher than immediately after said pair of rolls, whereas the mass flow rate of said product remains substantially unchanged before and after said second pair of rolls, said second pair of rolls reducing the cross-sectional area of the product passing therebetween by at least percent.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
US847816A 1966-12-01 1969-07-29 Improvements in or relating to processes of manufacturing rolled stock from products of continuous casting processes Expired - Lifetime US3680623A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT1110666A AT280191B (de) 1966-12-01 1966-12-01 Verfahren zur Herstellung von Walzprodukten aus Stranggußerzeugnissen mit Hilfe von zwei Walzenpaaren

Publications (1)

Publication Number Publication Date
US3680623A true US3680623A (en) 1972-08-01

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Application Number Title Priority Date Filing Date
US847816A Expired - Lifetime US3680623A (en) 1966-12-01 1969-07-29 Improvements in or relating to processes of manufacturing rolled stock from products of continuous casting processes

Country Status (7)

Country Link
US (1) US3680623A (de)
AT (1) AT280191B (de)
CH (1) CH468854A (de)
ES (1) ES347842A1 (de)
FR (1) FR1551261A (de)
GB (1) GB1183646A (de)
SE (1) SE325247B (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4043382A (en) * 1975-01-13 1977-08-23 Nippon Kokan Kabushiki Kaisha Method and apparatus for continuously casting steel
US4238230A (en) * 1978-09-28 1980-12-09 Jones & Laughlin Steel Corporation Process for producing free-machining steel
US4456491A (en) * 1979-10-01 1984-06-26 Southwire Company Method of hot-forming metals prone to crack during rolling
US4584029A (en) * 1979-10-01 1986-04-22 Southwire Company Method of hot-forming metals prone to crack during rolling
US4817703A (en) * 1986-11-06 1989-04-04 Sms Schloemann-Siemag Aktiengesellschaft Strip casing unit with downstream multi-stand continuous rolling mill
US4846254A (en) * 1987-06-11 1989-07-11 Hitachi, Ltd. Rolling installation for and rolling method of continuous cast strip
US4976306A (en) * 1988-05-25 1990-12-11 Mannesmann Ag Combined continuous casting and rolling
US5018666A (en) * 1989-12-01 1991-05-28 Cf&I Steel Corporation Unitary one quarter mile long railroad rail free of weld seams
US5195573A (en) * 1989-12-01 1993-03-23 Cf&I Steel Corporation Continuous rail production
US6669789B1 (en) 2001-08-31 2003-12-30 Nucor Corporation Method for producing titanium-bearing microalloyed high-strength low-alloy steel

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5422777B2 (de) * 1973-09-17 1979-08-09
US4422884A (en) * 1977-10-20 1983-12-27 Concast Ag Method of treating a continuously cast strand formed of stainless steel
GB2302054B (en) * 1995-06-01 1998-10-21 Ralph Gladwin Haynes Production of metal strip
DE19860570C1 (de) * 1998-12-22 2000-10-05 Sms Demag Ag Verfahren zur Erzeugung von runden Knüppeln

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US494659A (en) * 1893-04-04 Means for manufacturing metal bars or rods
US2698467A (en) * 1950-06-05 1955-01-04 Edward W Osann Jr Method and apparatus for the continuous casting of metal
US3358358A (en) * 1964-12-31 1967-12-19 United States Steel Corp Method of reducing width of metal slabs

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US494659A (en) * 1893-04-04 Means for manufacturing metal bars or rods
US2698467A (en) * 1950-06-05 1955-01-04 Edward W Osann Jr Method and apparatus for the continuous casting of metal
US3358358A (en) * 1964-12-31 1967-12-19 United States Steel Corp Method of reducing width of metal slabs

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4043382A (en) * 1975-01-13 1977-08-23 Nippon Kokan Kabushiki Kaisha Method and apparatus for continuously casting steel
US4238230A (en) * 1978-09-28 1980-12-09 Jones & Laughlin Steel Corporation Process for producing free-machining steel
US4456491A (en) * 1979-10-01 1984-06-26 Southwire Company Method of hot-forming metals prone to crack during rolling
US4584029A (en) * 1979-10-01 1986-04-22 Southwire Company Method of hot-forming metals prone to crack during rolling
US4817703A (en) * 1986-11-06 1989-04-04 Sms Schloemann-Siemag Aktiengesellschaft Strip casing unit with downstream multi-stand continuous rolling mill
US4846254A (en) * 1987-06-11 1989-07-11 Hitachi, Ltd. Rolling installation for and rolling method of continuous cast strip
US4958677A (en) * 1987-06-11 1990-09-25 Hitachi, Ltd. Rolling installation for and rolling method of continuous cast strip
US4976306A (en) * 1988-05-25 1990-12-11 Mannesmann Ag Combined continuous casting and rolling
US5018666A (en) * 1989-12-01 1991-05-28 Cf&I Steel Corporation Unitary one quarter mile long railroad rail free of weld seams
US5195573A (en) * 1989-12-01 1993-03-23 Cf&I Steel Corporation Continuous rail production
US5419387A (en) * 1989-12-01 1995-05-30 Cf&I Steel, L.P. Continuous rail production
US6669789B1 (en) 2001-08-31 2003-12-30 Nucor Corporation Method for producing titanium-bearing microalloyed high-strength low-alloy steel

Also Published As

Publication number Publication date
AT280191B (de) 1970-04-10
SE325247B (de) 1970-06-29
ES347842A1 (es) 1969-02-16
DE1558171A1 (de) 1970-03-19
GB1183646A (en) 1970-03-11
FR1551261A (de) 1968-12-27
DE1558171B2 (de) 1975-10-16
CH468854A (de) 1969-02-28

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