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
  • B22D11/16—Controlling or regulating processes or operations
• • 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
  • B22D11/16—Controlling or regulating processes or operations
  • B22D11/18—Controlling or regulating processes or operations for pouring

Definitions

• the invention relates to a method and a device for controlling the steel temperature from the casting level of a continuous casting mold over the area of the entire secondary metallurgy with a process stage determining the final temperature, such as a ladle furnace, up to the tapping of a steelmaking process.
• the steel temperature in the mold level is of essential importance with regard to the steel quality (surface and interior quality) and the casting reliability.
• the invention has for its object to provide a method and an apparatus which make it possible, independently of these numerous influencing variables, to plan and control the temperature travel of a melt between the steel temperature in the mold level and the furnace tapping and "online".
• Figure 1 shows the process and production chain between furnace tapping and casting level in the continuous casting mold
• Figure 2 shows the temperature travel or the temperature underflow of the steel over the process time for the process chain, starting from the mold level in the mold over the ladle furnace to the furnace racking;
• Figure 3 in two partial images 3a and 3b, for example, a melt planning.
• the distributor (3) and the pan (4.3) can be regarded as a heat exchanger, the specific heat data of which is determined by the type, age and state of wear of the lining.
• the desired steel temperature TML Tu + X ° C (2.1) is assumed and the desired steel temperature in the distributor (3.1) is determined for a planned casting speed and a planned casting format.
• the distributor temperature (3.1) is set accordingly by knowing the temperature loss (4.1 .1) between the ladle furnace and the distributor.
• a melt planning is shown in Figure 3, starting from the temperature of the steel in the mold level (2.1), expressed as the equivalent liquid temperature in the distributor T 0 M (3.1.) With auxiliary temperatures + 5, 10, 15, 20 ° C (3.1.1 ), depending on the casting speed (6) - Part 3a - up to the delivery temperature z.
• the delivery temperature of the steel at the ladle furnace is determined by the ladle history (7) with its two main areas of influence
• FIG. 4 shows a suitable pan detection system (8) on the basis of coded intrinsic radiation of the pan wall on a radiation sensor (receiver) (8.1 .2) by means of a perforated plate (8.1.1).
• pan history (7) is therefore composed
• the pan goes through various treatments such as cleaning (7.2.1), preparing the slide for the next use (7.2.2).
• the pan can also be removed from the pan cycle in order to be heated at a heating stand (7.5) when there are long periods of idleness, or to be reloaded at a pan wall stand (7.6).
• the pan cycle (7.4) is used to determine the pan history (7) relevant locations, the pan detection system (8), preferably by means of a coded pan radiation (8.1), which is based on the radiation of the pan installed.
• the movement and the differentiated time sequences in the areas “pan full” (7.1) "pan empty” (7.2) can be recorded and then "online” the temperature losses (4.1.1) between the LF and the distributor on the basis to place this data acquisition in a functional context.
• FIG. 2 shows the temperature travel of a melt from the electric furnace (5.2) or BOF (5.1) via the ladle furnace, LF-ex (4.1) to the casting level (2) in the mold (1).
• the planned steel temperature in the mold level (2.1) gives the basis for temperature planning in the manifold and on the ladle furnace LF-ex (4.1).
• the jump in temperature from the casting level in the distributor (9) or the temperature loss of the steel from the distribution level in the casting level is essentially determined by the casting speed (6) and casting performance, i. H. the solidification thickness and casting width.
• the jump in temperature from the distributor to the ladle furnace (4.1.1), on the other hand, is essentially determined by the history of the ladle (7) and the history of the distributor (3.2).
• Figure 3 is divided into sub-images a and b.
• the picture shows how the temperature losses depend on the dwell time of the steel in the pan (7.1) and the distribution preheating temperature (3.2.1) both for the first pan of a sequence and for subsequent pans. These temperature losses also depend on the remaining pan history (7) and can be determined “online” using the described method.
• FIG. 4 shows the pan detection system (8) on the basis of coded intrinsic radiation (8.1) with the aid of a perforated plate (8.1.1), which is generated by one or more radiation sensors (8.1) which are located at strategic points in the pan cycle (7.4 ) are placed, is detected.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Continuous Casting (AREA)
• Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
• Treatment Of Steel In Its Molten State (AREA)
• Control Of Temperature (AREA)
• Control Of Heat Treatment Processes (AREA)

Priority Applications (10)

Applications Claiming Priority (4)

Publications (2)

Family

ID=26007569

Family Applications (1)

Country Status (13)

Cited By (1)

Families Citing this family (3)

Citations (1)

Family Cites Families (9)

• 2001
  • 2001-10-31 JP JP2002539090A patent/JP2004512958A/ja not_active Withdrawn
  • 2001-10-31 BR BR0115073-1A patent/BR0115073A/pt not_active IP Right Cessation
  • 2001-10-31 EP EP01992623A patent/EP1337366A2/de not_active Withdrawn
  • 2001-10-31 HU HU0303371A patent/HUP0303371A2/hu unknown
  • 2001-10-31 PL PL01361622A patent/PL361622A1/xx unknown
  • 2001-10-31 MX MXPA03003950A patent/MXPA03003950A/es not_active Application Discontinuation
  • 2001-10-31 WO PCT/EP2001/012594 patent/WO2002036292A2/de not_active Application Discontinuation
  • 2001-10-31 AU AU2002224817A patent/AU2002224817A1/en not_active Abandoned
  • 2001-10-31 CZ CZ20031218A patent/CZ20031218A3/cs unknown
  • 2001-10-31 CA CA002424368A patent/CA2424368A1/en not_active Abandoned
  • 2001-10-31 US US10/399,002 patent/US20040031583A1/en not_active Abandoned
  • 2001-10-31 CN CNA018184928A patent/CN1473081A/zh active Pending
  • 2001-10-31 RU RU2003116517/02A patent/RU2003116517A/ru not_active Application Discontinuation

Patent Citations (1)

Non-Patent Citations (2)

Also Published As

Similar Documents

Legal Events