JPS6173892A - Descaling treatment device for steel material - Google Patents

Abstract

PURPOSE:To economize the space for recovering salt by providing a slide type liquid draining device on a quick cooling vessel and recovering the excess salt sticking to s steel material in the stage of dipping the steel material pulled up from a salt bath into the quick cooling vessel. CONSTITUTION:When the steel material 2 is pulled up from the salt bath, a hydraulic cylinder 10 moves forward and slides a sliding plate 13 via an arm 12 toward a B' direction so as to cover the water surface of the quick cooling vessel 5. The salt dropping from the treated steel material 2 transferred above the vessel 5 is received by the sliding plate. Since the plate 13 is supported by a supporting float 9 floating on the water, the plate is smoothly slided. The cylinder 10 retreats to retreat the plate 13 toward B and at the same time a cylinder 14 operates to lower a brush 15 so as to contact with the surface of the sliding plate upon ending of dropping. The dropped salt is thereby swept together and is discharged to a collector duct 16. The brush 15 rises when the retreat of the plate 13 ends. The material 2 is then dipped in the tank 5, by which the material is descaled.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a steel descaling treatment apparatus.

More specifically, the present invention relates to an apparatus applied to descaling steel materials, which combines a process using a salt bath and a subsequent quenching process.

[Prior art] Scale made of iron oxide forms on the surface of hot-rolled steel strips and wire rods (hereinafter referred to as steel materials), and in order to remove it, scarf ink with oxygen acetylene, sand blasting with sand shot, shot blasting, and sulfuric acid are used to remove it. , pickling using chemical action such as hydrochloric acid, a method using expansion and contraction due to induction heating, and a method using a vine 1 bath. Among these methods, a method using a salt bath is to use a mixed melt of caustic soda and l, ric acid soda heated to a drying temperature of 1400 to 430°C, after pretreatment such as pickling and water washing with a shower. The scale is immersed in a bath (salt bath) to reduce the Cr oxide in the scale, converting it to soluble scale, and then rapidly cooling to remove the scale. In addition, a salt film is formed on the surface, and then in a heat storage state,
The coating is immersed in a water-filled quench bath to be rapidly cooled, and the solidified coating salt is cracked, and the scale on the surface is entrained and removed together with the salt. In such a treatment, immediately after the steel material immersed in the salt bath is pulled up from the bath, excess molten salt adheres to the steel material and drips down. Conventionally, the pulled steel material to be descaled is kept on standby for a while on a salt bath, and then immersed in a quenching tank after waiting for the salt to run out, or, One method is to set up a drip tray and let the liquid drain on top of it. However, these salts themselves have a high viscosity and are difficult to drip, so a long waiting time must be set for each batch, which is extremely inefficient in terms of continuous descaling work. Furthermore, since a large amount of space is required to install the salt tray, there is a problem in that the layout of the equipment is restricted.

[Means for solving the problem] The present invention improves the efficiency of the descaling operation and improves the equipment by providing a salt draining device in the space above the quenching tank in an equipment for descaling steel materials using a salt bath method. The purpose is to simplify the arrangement and solve the above problem dj. That is, the present invention provides a steel descaling apparatus that combines a steel bath in which the steel material to be descaled is immersed and a quenching tank in which the steel material pulled from the salt bath is immersed and rapidly cooled. The object of the present invention is to provide a descaling apparatus for steel materials, characterized in that the quenching device is provided with a sliding drain for removing excess salt droplets adhering to the steel materials.

[Function] According to the apparatus of the present invention, it is possible to shorten the waiting time for draining the salt liquid on the salt bath of the steel material in the flow of descaling treatment using the salt bath method, and also to reduce excessive adhesion to the surface of the steel material. Recovering the salt 10 and eliminating the loss of salt, which is an expensive auxiliary agent, saves the installation space of the equipment.

[Example] The present invention will be described below based on the drawings. FIG. 1 is a plan layout of a descaling device incorporating the salt drip draining device of the present invention, FIG. 2 is a front view of an example of the draining device, and FIG. 3 is a side sectional view.

In Fig. 1, reference numeral 1 indicates a descaling process, in which a wire-shaped steel material 2 to be descaled, wound into a coil, which has undergone pre-treatments such as pickling and shower washing, is held in the direction of the arrow by voice 1 - a hanging tool, etc. It is transported and immersed in it. Hot water washing 4W 1 is filled with hot water of approximately 90°C generated in quenching tank 5 (described later), which is circulated and collected, and by immersing it in this water and pulling it up, steel material 2 is released from the heat received from the hot water. The surface is dried, and water droplets adhering to the surface are removed. 3 is a sludge layer that receives water droplets dripping from the steel material 2 immediately after being pulled up from the hot water wash Iw1. 4 is a salt bath in which the dried steel material 2 is immersed and pulled up to form a salt film on the surface. The salt bath 4 is filled with molten salt heated to 400 to 480°C by a salt heating furnace. Typical examples of salt components include salt with a blending ratio of 70 to 90% (by weight) of caustic soda, 10 to 30% of sodium nitrate, and a melting point of 300 to 400°C. The immersion time of the steel material in the crane 1 to bath 4 is as follows:
It takes about 5 to 15 minutes, depending on the type, external shape, Lffi, volume ratio to salt, etc. 5 is about 90
The steel material 2, which has been pulled up from the salt bath 4 and has a salt film formed on its surface, is immersed in a quenching tank filled with dry water at a temperature of °C and quenched, thereby causing heat shrinkage and cracks in the solidified salt film on the surface. This causes the scale that is directly deposited on the surface of the treated steel to be removed. The water 6 in the quenching tank 5 is kept at about 90°C or higher due to the transfer of its retained heat (heat received in the salt bath 4) and accumulation of heat due to the repetition of the soaking batch in April 2. Then, the generated hot water is collected and circulated to the hot water washing tank 1 without being disposed of. 7 is a pipe in which a transfer pump P for this purpose is arranged. 8 is salt on the surface pulled up from salt bath 4? l! ! This is a draining device that drips and removes droplets of excessively attached molten salt before the steel material 2 on which the film is formed is immersed in the quenching tank 5 mentioned above. provided. As shown in FIGS. 2 and 3, the liquid draining device 8 has a front side edge supported by a support float 9 floating on water 6 in the quenching tank 5, and a hydraulic cylinder 10.
The other side edge connects the arm 12 which rotates in the direction of the arrow with the shaft 11 as the center, moves forward and backward while keeping the force direction horizontal, and moves from the salt bath 4 to the quenching tank 5.
A slide plate 13 is located directly below the steel material 2 that has been transferred upward, and receives the excess molten salt dripping from the steel material. It consists of a brush 15 that moves up and down to sweep up the salt dripping onto the slide plate 13, and a collector dust 16 that discharges the salt collected by the brush 15.

When the steel material 2 is pulled up from the bath 4 to the crane 1,
According to a command from a control device (not shown) that receives the signal,
The hydraulic cylinder 10 moves forward, and the slide plate 13 slides through the arm 12, moving forward in the direction of arrow B') to rapidly cool the treated steel material that has flowed over the water surface of ff5 and onto the quench tank 5. 2. In this case, the slide plate 13 is heavy and slides smoothly because the front side edge is supported by the support float 9 floating on the water 6. The dripping is completed (usually about 20 seconds). )if,
A timer in the control 2Il device causes the hydraulic cylinder 1 to
At the same time, the hydraulic cylinder 14 is activated by a command from the control device, and the brush 15 descends and comes into contact with the surface of the slide plate, discharging the dripping salt. It is collected and discharged to the collector duct 16.

When the slide plate 13 finishes retreating, the brush 15 rises and returns to its original position.

The above operation is repeated for each batch of steel material 2 pulled from the salt bath 4, and the salt is recovered and circulated to the salt bath 4 again.

In the above manner, the vines 1 to 1 on the surface are immersed in the quenching tank 5.
The scale is removed along with the peeling of the coating.The steel material is pulled up from the quenching tank 5, and then subjected to a shower cleaning tank, an acid cleaning tank, an alkali cleaning tank, etc. (all not shown) as necessary. It is considered as a product.

[Effects] As described above, the present invention forms a salt film on the surface of a steel material by the salt method, and then immerses it in a quenching bath filled with water to cause cracks due to thermal contraction of the salt film. In a device that removes scale by entraining it into a quenching tank, a slide-type liquid drainer is used to quickly cool down excess scale 1-, which collects excess scale that drips from the steel material to be descaled immediately after being pulled out of the salt bath, before being immersed in the quenching tank. It makes use of the space above the tank and installs a button on the upper side of the tank, making it possible to save space and completely recover expensive salt, and its industrial value is high.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an example of the apparatus of the present invention, FIG. 2 is a front view of an example of a liquid draining device in the apparatus of the present invention, and FIG. 3 is a side sectional view. 1... Descaling treated steel material

Claims (1)

[Claims] 1. A salt bath in which the steel material to be descaled is immersed;
In a steel descaling device that combines a quenching tank that immerses and quenches the steel pulled up from the salt bath, a slide is placed on the quenching tank to remove molten salt excessively attached to the steel pulled up from the salt bath. 1. A descaling device for steel materials, characterized in that it is equipped with a type liquid draining device. 2. A slide type liquid draining device is supported by a support float floating in the quenching tank, and a slide plate moves forward and backward on the top surface of the quenching tank by the operation of a hydraulic cylinder, and excess melt from the steel material dripped on the slide plate is removed. 2. The steel descaling apparatus according to claim 1, comprising a brush that sweeps up salt by the operation of a hydraulic cylinder, and a collector duct that discharges the swept salt.