JPS62151204A - Treatment of hot rolled metallic strip - Google Patents

Abstract

PURPOSE:To decrease the energy consumption required for plastic working and to reduce an initial cost by elongating a coiled metallic strip after hot rolling to a specific rate in the high-temp. state than recovering the sensible heat thereof and pickling the metallic strip. CONSTITUTION:The hot rolled metallic strip coil 1 of a high temp. is supplied by an un-coiler 2 to the line and is elongated at >=3% in a tension leveler 7. The sensitive heat retained in the metallic strip introduced into a powder fluidized bed device 8 is recovered in said device and after the scale on the surface of the metallic strip is removed in a pickling tank 11, the metallic strip is cleaned of the acid soln. in a rinsing tank 12 and is dried in dryer 13. Since the elongation is provided to the metallic strip in the high temp. state, the energy consumption required for plastic working is decreased and the smaller motor capacity of the tension leveler and temper rolling mill for applying the elongation is required. The initial cost is thus reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of treating a high temperature metal strip, such as a hot rolled steel strip, by effectively descaling and recovering sensible heat.

(Prior art) As an efficient method for descaling a steel strip after hot rolling, elongation is imparted to the steel strip using a tension leveler or a temper rolling mill, as shown in Japanese Patent Application Laid-Open No. 58-209415C, for example. There is a known method in which pickling is carried out after 4. In this method, the steel strip after hot rolling is cooled to below -100 DEG C., then rewound and processed through a tension leveler or temper rolling mill.

(Problems to be Solved by the Invention) However, such conventional descaling methods have the following drawbacks.

■Since plastic working is applied to the steel strip at low temperatures, the deformation resistance is high and the plastic working energy is large.

■Furthermore, due to the above, the required motor power has increased, resulting in a rise in equipment costs.

The present invention solves these problems, enables plastic working at high temperatures, performs efficient descaling, and (
1) Our objective is to provide a method for processing hot rolled metal strips that can save energy by recovering the sensible heat possessed by steel.

(Means for solving the problem) The method of the present invention for achieving this L1 goal is configured as follows. In other words, the coiled metal (;?) after hot pressing is kept in a high temperature state.
3. Pass it through a tension leveler or temper rolling mill.
% or more, the high-temperature metal strip is passed through a powder fluidized bed or a molten salt tank to recover sensible heat, and the metal strip is further led to a pickling tank for pickling. This is a method for treating hot rolled metal strips.

(Detailed explanation using specific examples of the invention) Hereinafter, the method of the present invention will be explained based on examples of equipment shown in the drawings.

In Fig. 1, 1 is a hot-rolled high-temperature metal strip coil, 2 is an unwinding machine for installing and unwinding the coil 1, and the metal strip is turned into a line by chain unwinding a2. Supplied. 3 is a metal band 8 provided close to the chain unwinding a2.
4 is a leveler for correcting the shape of the metal strip 8; 5 is a built-in welding machine that sequentially connects the metal strips 1) and 8 that are being fed; It has a built-in trimmer. 6a, 6
b, 6c, and 6d are flytle rolls placed before and after the tension leveler and powder fluidized bed device, which will be described later, and at the front of the pickling tank.
It is something to do.

7 is a flight roll 6a, 6 at the rear of the weld v15.
Denshimi with b placed on the front and back! Is it a high temperature metal leveler? This gives an elongation of 3% or more. If the elongation is less than 3%, effective scale flaking cannot be expected.
% is sufficient.

In addition, 8 is a powder fluidized bed device, and a metal band 8 introduced therein.
It is useless to collect the &g38 that is in possession of.

In the powder fluidized bed device 8, while the metal strip is repeatedly raised and lowered by a plurality of turn rolls and passes through a plurality of fluidized beds divided by outer walls, sensible heat is generated in the powder and fluidized gas. The recovery operation is carried out by heating the water in the steam generation pipes that are transferred and placed inside.

9a and 9b are loop cars installed between the fluidization tank 8 and the pickling tank, and lOa and 10b are steering rolls. 11
1 is a pickling tank consisting of multiple tanks for removing scale from the surface of the metal strip, 12 is a rinsing tank, and 13 is a hot trier.

] In the equipment described above, the unwound metal strip is passed through the tensicon leveler 7 while still in a high temperature state and undergoes q7 hardening, but minimal plastic working energy is required. Subsequently, the entire FiA band is sent to a powder fluidization tank 8 to recover its sensible heat, and then supplied to a pickling tank 11 to remove scale, and then washed with acid solution in a rinsing tank 12. It is dried in a dryer 13.

In addition, in the embodiment shown in FIG. 1, the elongation to the metal band rt
Although a tensicon leveler is shown as one means, a temper rolling mill may be installed instead.

Further, although a powder fluidized bed device is illustrated as an example of a sensible heat recovery device, a conventionally widely used molten salt tank may of course be used. Furthermore, in the embodiment L, one equipment row up to the pickling tank is explained, followed by a loop car, or continuous annealing in the rolling mill history following the loop car. A furnace may be arranged (effects of the invention) According to the processing method of the present invention described above, elongation is given to the metal strip at high temperature Jg, so the energy consumption required for plastic working is small, and The tension leveler for imparting elongation and the motor capacity of the temper rolling mill can also be small, resulting in lower equipment costs. Moreover, the sensible heat of the hot-rolled coil, which was conventionally left to cool, can be easily recovered.

[Brief explanation of drawings]

FIG. 1 is an overall layout diagram showing an example of a processing equipment array for carrying out the present invention. l...Full bending 1? Coil, 2... Rewinding machine, 3...
・Pinch roll, 4... Leveler, 5... Welding machine,
6... Flytle roll, 7... Tensicon leveler, 8... Powder fluidized bed, 14... Pickling tank, 12.
...Rinse tank, 13... Hola 1-Dryer.

Claims (1)

[Claims] After hot rolling, the coiled metal strip is unwound in a high temperature state, passed through a tension leveler or temper rolling mill to give an elongation of 3% or more, and then passed through a powder fluidized bed or a molten salt tank to be heated to a high temperature. A method for treating a hot-rolled metal strip, characterized by recovering sensible heat from the metal strip, and further introducing the metal strip into a pickling tank for pickling.