Classifications

• • 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
  • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
  • C21D1/62—Quenching devices
  • C21D1/667—Quenching devices for spray quenching
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
  • B21B45/0203—Cooling
  • B21B45/0209—Cooling devices, e.g. using gaseous coolants
  • B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
  • B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
  • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
  • B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically

Definitions

• the invention relates to a method and a device for reducing scale formation on a rolling stock that runs out of a rolling stand.
• the object is achieved by a method or a device according to claim 1 or claim 11.
• the rolling stock is sprayed with heated water, in particular with wet steam, after the rolling stand, the heated water, in particular wet steam, being sprayed with a material that deviates from the perpendicular to the surface of the rolling stock Main spray component is sprayed onto the rolling stock.
• the formation of scale is significantly reduced or existing scale is removed (in part) when the rolling stock runs out of the rolling stand.
• the rolling stock can be cooled significantly faster in this way, which on the one hand allows the use of a shorter cooling section and on the other hand reduces the quality of the rolling stock.
• the heated water in particular the wet steam, is sprayed onto the rolling stock under a main spray angle of 15 ° to 45 °, advantageously 15 ° to 30 °.
• the heated water in particular wet steam, is sprayed onto the rolling stock in a main spray component which is cut out on at least one outer edge of the rolling stock. In this way, a particularly good reduction in scale formation is achieved.
• the heated water in particular wet steam, is sprayed onto the rolling stock with a main spray component in the running direction of the rolling stock.
• the rolling stock is sprayed with coolant from above and from below. In this way it is possible to reduce the scale formation on both sides of the rolling stock and to cool the rolling stock particularly quickly.
• the rolling stock is sprayed with water, the temperature of which lies between 50 ° C. and the boiling point.
• An even more favorable temperature range for the heated water is the range between 80 ° C. and the boiling point, the range between 90 ° C. and 99 ° C. again proving to be particularly advantageous from this range.
• Water from this temperature range evaporates particularly quickly when it hits the hot rolling stock.
• the water is in the form of particularly small droplets, in particular r. Form of spray mist, sprayed against the rolling stock. This use of hot wet steam or hot spray mist has r Vercm ⁇ ung i of the invention found to be particularly advantageous for reducing scale formation or for removing scale.
• the cooling water or the wet steam is sprayed against the rolling stock at a relatively high pressure.
• deoxidation gases in particular carbon monoxide or hydrogen
• deoxidation gases are added to the cooling water, as a result of which scale formation is counteracted. It is also advantageous to add scale to the coolant.
• FIG. 1 shows a cow device for cooling rolled stock
• FIG. 2 shows a cow device for cooling rolled stock with double-sided cooling
• FIG. 3 shows an embodiment of the invention
• FIG. 4 shows a further exemplary embodiment of the invention
• FIG. 5 shows a cooling device for cooling rolled material.
• the rolling stock 3 After leaving the last rolling stand, the rolling stock 3 is cooled by a cooling device.
• the cooling device has coolant lines 4, 41, 42, 43 with nozzles 31, 45, 46, 47, from which coolant 5, 51, 52, 53 is sprayed onto the rolling stock 3.
• the coolant 5, 51, 52, 53 is heated water or wet steam. A temperature range for the heated water of 80 to 99 ° C, ms- especially preserved from 90 to 99 ° C.
• the coolant 5, 51, 52, 53 is advantageously sprayed against the rolling stock at high pressure in the form of small droplets, such as spray mist.
• the rolling stock 3 is cooled by a cooling device after leaving the last rolling stand.
• the cooling device has coolant lines 4, 41, 42, 43 and 6, 61, 62, 63 with nozzles 21, 45, 46, 47 and 64, 65, 66, 67, from which coolants 5, 51, 52, 53 and 7 , 71, 72, 73 is sprayed onto the rolling stock 3.
• the coolant 5, 51, 52, 53 and 7, 71, 72, 73 is advantageously heated water or wet steam.
• a temperature range for the heated water of 80 to 99 ° C, in particular of 90 to 99 ° C, has especially been preserved.
• the coolant 5, 51, 52, 53 and 7, 71, 72, 73 is advantageously sprayed against the rolling stock 3 at high pressure in the form of small droplets, such as spray mist. Details of the cooling with devices as shown in FIGS. 1 and 2 can be found in DE 196 37 916.
• the coolant line 4 has slanted nozzles 31, 32, 33, 34.
• the nozzles 31, 32, 33, 34 sprinkle with a main spray direction component to the respective outer edges of the rolling stock 3.
• the main spray direction also deviates in the running direction 38 of the rolling stock 3 from the vertical of the surface of the rolling stock 3.
• the coolant line 4 is replaced by a coolant line 35.
• the coolant line 35 has a nozzle 36 which sprays the coolant 37 onto the rolling stock 3.
• the direction of spray of the nozzle 36 m with respect to the running direction 38 of the rolling stock 3 deviates by an angle ⁇ from the vertical of the surface of the rolling stock 3.
• ß is advantageously 15 to 45 °.
• ⁇ 25 °.
• the nozzles are inclined both by a main spray angle and by an angle ⁇ .
• the orientations of the nozzles according to FIG. 3 and FIG. 4 are correspondingly transferred to nozzles 7, 71, 72, 73 below the rolling stock 3 according to FIG.
• FIG. 5 Such an arrangement is shown in FIG. 5, the cooling element being part of a cooling section for cooling the rolling stock 3.
• the rolling stock 3 is guided on a shaft 18 which is driven by a motor 10.
• the rolling stock 3 is sprayed with coolant 5 and 7 from coolant lines 4 and 6. Heated water or wet steam is used as the coolant 5 and 7. The water evaporates when it hits the rolling stock 3.
• a hood 15 is also provided so that no condensed water drips onto the rolling stock 3.
• the condensed water runs off and is optionally used again as cooling water by means of a condensate drain 20.
• the cover 16 is connected to a steam discharge pipe 22 with a blower 21. The majority of the steam is sucked off by means of the blower 21.

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• 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)
• Preparation Of Fruits And Vegetables (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7887937

Family Applications (1)

Country Status (4)

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Family Cites Families (8)

• 1998
  • 1998-11-16 DE DE19852759A patent/DE19852759A1/de not_active Withdrawn
• 1999
  • 1999-11-03 EP EP99960861A patent/EP1131170B1/fr not_active Expired - Lifetime
  • 1999-11-03 WO PCT/DE1999/003518 patent/WO2000029140A1/fr active IP Right Grant
  • 1999-11-03 DE DE59904248T patent/DE59904248D1/de not_active Expired - Fee Related
  • 1999-11-03 AT AT99960861T patent/ATE232147T1/de not_active IP Right Cessation

Non-Patent Citations (1)

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