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
  • 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

Definitions

• the invention relates to a method for the continuous casting-rolling of flat metal products, in particular of steel, according to the preamble of claim 1.
• Flat products are the starting material for the production of sheets or strips.
• Flat products of this type are also referred to as slabs or thin slabs. If slabs with a size exceeding a certain thickness are produced, segregation problems generally occur. According to DE-OS 24 44 443, segregation in products of this type is to be prevented by the fact that in the continuous casting installation, a deformation with a degree of reduction of 0.1 to 2% is exerted on the strand within the solidification section, as shortly before the solidification point as possible.
• EP 0286862 A 1 a plant for producing a steel strip is known, the strand emerging from the continuous casting plant, which has already been reduced in thickness by being compressed, being rolled out into the actual strip in a subsequent rolling stand.
• a disadvantage of this method is the considerable mechanical outlay and, in the case of the pre-strips, also the casting structure.
• the invention is based on the object of specifying a method with which a product with a high proportion is already present with the continuous casting installation Roll structure is made available, which is coil-capable with the thickness dimension leaving the casting plant.
• the object is achieved according to the invention in that the continuous casting mold is produced a flat product with a thickness of 50 to 100 mm, that the flat product thus produced is reduced in thickness within the solidification section by at least 10 to 70% and by means of the roller pairs in the solidified area of the flat product a further reduction in the thickness at least 30% is made.
• the thickness reduction of the flat product in the area of the solidification section and in the solidified area is coordinated with one another in such a way that the total reduction of the flat product is at least 60%.
• the flat product thus produced is at a thickness of max. 35 mm coil capable, so that in a further embodiment of the invention, the flat product obtained is coiled after the casting-rolling process.
• the flat product emerging from the mold by an atmosphere which prevents scaling of the flat product.
• the atmosphere should be maintained over the entire area of the deformation path. This can be done in particular by maintaining an inert gas atmosphere within the strand guide section. If this is not possible for operational reasons, descaling the flat product within the deformation section is an equivalent measure.
• the formation of the desired fine-grained structure can be supported in that the flat product leaving the mold is cooled exclusively by means of internally cooled rollers.
• the rollers can be surface-coated in order to reduce the cooling effect caused by the rollers.
• the temperature range of 1500 - 1200 ° C for further reduction has proven to be particularly favorable for maintaining an isotropic structure.
• a continuous caster-type caster steel is poured into a mold with a cross-sectional dimension of 60 mm x 1200 mm.
• the strand which partially solidifies across the cross section, is drawn off from the mold at a speed of approx.
• the pairs of rollers can be adjusted individually or in segments against the strand and are pressed against the strand in such a way that in the area of the solidification section, i.e. from the end of the mold to solidification, the strand has a thickness of 36 mm (approx. 40% of the dimension at the mold outlet) ) is reduced.
• This area is followed by another area with pairs of rolls, in which a further reduction in thickness from 36 to 25 mm (30% from the already reduced strand thickness) is carried out.
• a further reduction in thickness from 36 to 25 mm (30% from the already reduced strand thickness) is carried out.
• the deformation in the area of the solidification section as well as after solidification can take place with one or more pairs of rollers.
• the flat product produced in this way can then be wound up into the coil or fed directly to further processing by rolling.
• a flat product is produced by the described method of operation, which already has a fine-grained structure corresponding to a rolled product when it leaves the continuous casting installation. Such a material is coilable without difficulty. It has also surprisingly been found that the strength properties and toughness values of a flat product produced by the method according to the invention correspond to the properties of a rolled product even at these low degrees of deformation.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Metal Rolling (AREA)
• Continuous Casting (AREA)
• Moulding By Coating Moulds (AREA)
• Mold Materials And Core Materials (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (4)

Family

ID=6355277

Family Applications (1)

Country Status (9)

Cited By (3)

Families Citing this family (14)

Family Cites Families (8)

• 1988
  • 1988-05-25 DE DE3818077A patent/DE3818077A1/de active Granted
• 1989
  • 1989-05-09 US US07/349,599 patent/US4976306A/en not_active Expired - Lifetime
  • 1989-05-11 ES ES89730119T patent/ES2044205T5/es not_active Expired - Lifetime
  • 1989-05-11 DE DE8989730119T patent/DE58905221D1/de not_active Expired - Lifetime
  • 1989-05-11 EP EP89730119A patent/EP0344095B2/fr not_active Expired - Lifetime
  • 1989-05-11 AT AT89730119T patent/ATE92797T1/de not_active IP Right Cessation
  • 1989-05-19 JP JP1126557A patent/JP3065321B2/ja not_active Expired - Lifetime
  • 1989-05-24 BR BR898902396A patent/BR8902396A/pt not_active IP Right Cessation
  • 1989-05-24 CN CN89103418A patent/CN1018157B/zh not_active Expired
  • 1989-05-25 CA CA000600613A patent/CA1311991C/fr not_active Expired - Fee Related

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