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US3678571A - Method for the production of sheets - Google Patents

Method for the production of sheets Download PDF

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Publication number
US3678571A
US3678571A US32230A US3678571DA US3678571A US 3678571 A US3678571 A US 3678571A US 32230 A US32230 A US 32230A US 3678571D A US3678571D A US 3678571DA US 3678571 A US3678571 A US 3678571A
Authority
US
United States
Prior art keywords
bar
slabs
temperature
cross
cast
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.)
Expired - Lifetime
Application number
US32230A
Other languages
English (en)
Inventor
Rudolf Schoffmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voestalpine AG
Voest AG
Original Assignee
Voestalpine AG
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
Application filed by Voestalpine AG filed Critical Voestalpine AG
Application granted granted Critical
Publication of US3678571A publication Critical patent/US3678571A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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 by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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 by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49972—Method of mechanical manufacture with separating, localizing, or eliminating of as-cast defects from a metal casting [e.g., anti-pipe]
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting
    • Y10T29/49989—Followed by cutting or removing material
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting
    • Y10T29/49991—Combined with rolling

Definitions

  • ABSTRACT [30] Foreign Applicafim Prim'ity Data
  • the disclosure proposes a method for the production of sheets May 9, 1969 Austria; ..A 4445/69 l the 81-395 cm mm a bar Steel by tinuous casting method, wherein the cast bar, after it has solidified completely and as soon as its cross section has an [52] U.S. Cl ..29/527.6,29/527.7, 148/2, equalized temperature in the range of 9000 to 12000 C. 148/12, 164/76 preferably 1,000 to l,l00 C., is shaped in one step so as to 5 l Int.
  • Cl ..B23p 25/00 reduce its cross section by about 10 to 20 percent, whereupon Fleld 0t search-w it is shorn to length, and the slabs are then heated to rolling 164/76; 148/2, 12 temperature and shaped in a plurality of passes. Owing to this method the bubble wreath which is characteristic for unkilled [56] References Cited steel slabs is eliminated so that the heat transition from the i surface to the core is improved.
  • the invention relates to a method for the production of sheets from slabs cut from a cast bar of unkilled steel which was cast by the continuous casting method.
  • unkilled steel slabs When unkilled steel slabs are to be processed to sheets in a train of rolls they have to be subjected to a preliminary treatment. Their surface has to be examined and surface defects, have to be removed.
  • the slabs When the slabs are completely cooled,l they are heated to rolling temperature in continuous type furnaces before they are rolled out to sheets in a plurality of passes.
  • the slabs When the slabs are heated to rolling temperature the: wreath of bubbles which is characteristic for unkilled steel; slabs provides great difficulties because it impairs the heat transition from the surface of the slabs into the core of the slabs when they are heated up in gas or oil heated furnaces. As i a result, the surface is overheated and heavy scaling occurs,
  • unkilled steel slabs usually amounts to 250 to 300 mm; the slabs are about l,250 mm broad and up to 12 m long. Thus the cross sections and the piece weights are considerable. Attempts are being made to find a solution for the economical and qualitative problems in the rolling of unkilled steel slabs but up to now the heating problem which presents itself owing to the presence of the bubble wreath has remained unsolved.
  • the invention is aimed at avoiding the described disadvantages and difficulties and, in a method for the production of sheets from slabs cut from a cast bar of unkilled steel which was cast by the continuous casting method, wherein the slabs are heated to rolling temperature and shaped in a plurality of passes, resides in that the cast bar, prior to being shorn to length, is shaped in one step after complete solidification and' HS soon as the solidified bar has over its entire cross section a uniform temperature in the range of 900 to l,200 C., preferably l,000 to l,l C.
  • the temperature is equalized over the entire cross section of the bar by arranging behind the secondary cooling zone a non-cooled or heated equalization zone, respectively, through which the bar is passed prior to being shaped in one step.
  • Shaping according to the invention is effected to a degree which about corresponds to the volume of the hollow spaces of the bubbles in the bar so that the material is densified.
  • the cross section of the bar is reduced in the one step haping process by about "to to 20 percent without any noticeable cogging down. Instead, re-shaping is effected.
  • the attached drawing shows the cross section of a bar of unkilled steel before being shaped according to the invention.
  • the macroscopic structure of a slab is schematically shown.
  • three zones may clearly be distinguished, namely zone 1 which is free from bubbles, which zone is also called bacon layer," or skin the marginal bubble zone 2 proper, and the core zone 3 of the bar cross section.
  • the thickness of the marginal layer 1 which is free from bubbles in unkilled steel slabs depends on the withdrawal speed and the intensity of gas evolution and motion (boiling) of the metal in the casting mould and in general does not amount to less than 10 mm.
  • the marginal bubbles are pressed together already when the bar is slightly shaped after its solidification so that they are welded together and a densification of the bar in the area of the marginal bubble zone 2 is effected so that the heat insulating bubble wreath is removed.
  • a bar of unkilled steel which has been densified according to this method may be heated to rolling temperature in gas or oil heated furnaces exactly as a bar of killed steel.
  • the aim of the invention i.e. an improvement of the quality of the slabs with regard to their heat technological properties so that an essentially improved heat transition is achieved, will also be obtained when not all bubbles are welded together completely.
  • the heating process is hardly impaired by individual bubbles which may be present still after shaping.
  • the method according to the invention does not require high accuracy in the determination of the bubble hollow spaces, which fact simplifies its application in practice.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)
  • Continuous Casting (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
US32230A 1969-05-09 1970-04-27 Method for the production of sheets Expired - Lifetime US3678571A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT444569A AT293315B (de) 1969-05-09 1969-05-09 Verfahren zur Bearbeitung eines unberuhigt vergossenen Stahlstranges

Publications (1)

Publication Number Publication Date
US3678571A true US3678571A (en) 1972-07-25

Family

ID=3564105

Family Applications (1)

Application Number Title Priority Date Filing Date
US32230A Expired - Lifetime US3678571A (en) 1969-05-09 1970-04-27 Method for the production of sheets

Country Status (12)

Country Link
US (1) US3678571A (zh)
JP (1) JPS4820691B1 (zh)
AT (1) AT293315B (zh)
BE (1) BE750120A (zh)
CA (1) CA939174A (zh)
CH (1) CH504257A (zh)
CS (1) CS152474B2 (zh)
ES (1) ES379081A1 (zh)
FR (1) FR2046436A5 (zh)
GB (1) GB1306135A (zh)
SE (1) SE364197B (zh)
SU (1) SU361543A3 (zh)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4204884A (en) * 1978-08-11 1980-05-27 Ingersoll Steel Company Method of conditioning cast steel for hot working
US4256516A (en) * 1978-12-26 1981-03-17 Nippon Kokan Kabushiki Kaisha Method of manufacturing non-magnetic Fe-Mn steels having low thermal expansion coefficients and high yield points
US4422884A (en) * 1977-10-20 1983-12-27 Concast Ag Method of treating a continuously cast strand formed of stainless steel

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2545935C2 (de) * 1975-10-14 1984-04-26 Mannesmann AG, 4000 Düsseldorf Verfahren und Walzwerk zum Auswalzen einer Bramme, vorzugsweise einer Stranggußbramme, zu einem Knüppel mit quadratischem oder annähernd quadratischem Querschnitt

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3317994A (en) * 1964-08-19 1967-05-09 Southwire Co Method of conditioning metal for hot forming
US3491823A (en) * 1966-04-22 1970-01-27 Boehler & Co Ag Geb Process for the manufacture of continuous castings

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3317994A (en) * 1964-08-19 1967-05-09 Southwire Co Method of conditioning metal for hot forming
US3491823A (en) * 1966-04-22 1970-01-27 Boehler & Co Ag Geb Process for the manufacture of continuous castings

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
The Making, Shaping and Treating of Steel, 1964, p. 550. *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4422884A (en) * 1977-10-20 1983-12-27 Concast Ag Method of treating a continuously cast strand formed of stainless steel
US4204884A (en) * 1978-08-11 1980-05-27 Ingersoll Steel Company Method of conditioning cast steel for hot working
US4256516A (en) * 1978-12-26 1981-03-17 Nippon Kokan Kabushiki Kaisha Method of manufacturing non-magnetic Fe-Mn steels having low thermal expansion coefficients and high yield points

Also Published As

Publication number Publication date
CA939174A (en) 1974-01-01
FR2046436A5 (zh) 1971-03-05
DE2019699A1 (de) 1970-11-19
ES379081A1 (es) 1972-09-01
AT293315B (de) 1971-10-11
CH504257A (de) 1971-03-15
JPS4820691B1 (zh) 1973-06-22
SE364197B (zh) 1974-02-18
DE2019699B2 (de) 1975-09-04
CS152474B2 (zh) 1973-12-19
GB1306135A (zh) 1973-02-07
SU361543A3 (zh) 1972-12-07
BE750120A (fr) 1970-10-16

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