JPH05294280A - Shipment of warm steel piece and heat insulating container for shipment - Google Patents

Abstract

PURPOSE:To improve the shipment efficiency for warm steel pieces and the land transportation efficiency for the warm steel pieces which is accompanied with the ocean transportation, by placing a heat insulating cover which is formed in a rectangular parallelopiped shape and is formed in a state where the bottom part is opened and a heat insulating layer is formed in the inside of each surface, in the state where the warm steel pieces are enclosed, on a flat plate shaped placing board. CONSTITUTION:A plurality of warm steel pieces 1 are successively superposed upward on a flat plate shaped placing board 2 which is installation-fixed in the hatch bottom part 9a of a vessel. Then, a temperature insulating cover 3 which is formed to a rectangular parallelopiped shape and is formed in the state where the bottom part is opened and a heat insulating layer is installed in the inside of each surface is placed on the flat plate shaped placing board 2 in the state where the warm steel pieces 1 which are placed in the superposed state on the flat plate shaped placing board 2 are enclosed. As for the temperature insulating cover 3, a plurality of reinforcing members 3c are arranged in a prescribed intervals between the outer wall plate 3a and the inner wall plate 3b on each surface, and the part between the outer wall plate 3a and the inner wall plate 3b is filled with the heat insulating material, and a heat insulating layer 3d is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel slab cast by continuous casting in the field of steel and a slab slab rolled from an ingot, which is mainly a hot steel whose material is required to suppress temperature drop. A method for shipping hot steel pieces that can efficiently carry out mass transportation while suppressing the temperature drop of the hot steel pieces when transporting pieces etc. over the sea and improving the transportation efficiency, and a shipping method suitable for carrying out this method. The present invention relates to a heat insulating container.

[0002]

2. Description of the Related Art In the field of iron and steel, conventionally, austenitic and ferritic stainless steels have been the mainstream as conventional stainless steels, but with recent advances in steelmaking technology, for example, various types of steels can be produced at low cost. The quality of the ferritic single-phase stainless steel has improved, while the processing technology and welding technology of the steel material have also improved, and it has been used for various purposes, and its demand has expanded. A slab cast by continuous casting of this ferritic single phase stainless steel or a slab rolled from an ingot is 475 ° C brittleness, which causes breakage of the slab during cooling or cracking during grinding. There are drawbacks such as abnormal quality occurring in the hot-rolled steel strip coil, but these drawbacks are before charging into a heating furnace for heating the cast slab or steel slab and heating. The applicant of the present application has found that the problem can be solved unless the surface temperature is lowered to 50 ° C. or lower.
Disclosed in Japanese Patent Publication No.

A slab or a steel slab (hereinafter referred to as a hot steel slab) which has to be heated and hot-rolled in a state where the temperature does not fall below a predetermined temperature, such as a ferritic single phase stainless steel, is If there is no hot rolling line that can perform hot rolling near the ironworks, or if hot rolling cannot be quantitatively handled within the ironworks, hot rolling may be performed. Have to be transported to the steel mill in. In this transportation, for example, the weight of one hot steel piece is 13 to 18
Tons (larger ones are about 200mm x 1300mm x 9000m
It is difficult to rely on land transportation due to the large weight of 18 tons in m), and as mentioned above, the amount of transportation has increased with the expansion of demand, so relatively inexpensive and large-scale transportation. The sea transportation that can be done has come to be performed.

[0004] Conventionally, the shipping of this hot billet by sea has been carried out through the following procedure. That is, the hot steel slab is cast by continuous casting or is slab-rolled from an ingot, and then is usually charged in a heat-retaining pit after removing surface defects, and the temperature drop is suppressed, and when transported by sea. First, for transporting a heat-insulating box body in which a heat insulating material such as glass wool is filled between a steel plate forming the inner wall surface of each surface and a steel plate forming the outer wall surface of the rectangular parallelepiped with the upper surface open. It is installed on the loading platform of a vehicle (for example, a semi-trailer), and then using a tong suspended from a crane, one piece of warm steel that had been loaded into the heat retaining pit is transferred and loaded into the body of the heat retaining box. After loading, a lid filled with a heat insulating material such as glass wool between the steel plate forming the lower surface and the steel plate forming the upper surface, respectively, is installed on the body of the heat insulating box and transported to the coastal cargo handling area by land. And coast The above-mentioned heat-insulating box, in which warm steel slabs are charged using a crane and a wire at the public office, is stacked as it is in a maximum of two stages inside the ship's carry, and in order to prevent the cargo from slipping due to shaking of the ship, etc. Inside, the heat insulation box with the hot steel pieces inserted was fixed with wires or the like.

In transporting the hot steel bill in this way,
In the conventional transportation of hot steel bills, the weight of one hot steel bill was considerably large as described above, and therefore, a method of charging one hot steel bill into one heat retaining box was adopted. However, the weight of the empty heat insulation box, which is the combination of the lid and the main body of the heat insulation box, has reached about 5.5 tons, and one warm box is charged with one piece of hot steel. There is a situation where it is not possible to lift it using a crane and a wire because of the weight that can be handled, and since the size of the hot steel pieces is not constant, at least the lid body should be loaded with the hot steel pieces loaded in the heat insulation box. Since there is a space between the heat-insulating steel and the hot-steel pieces, stacking three or more heat-insulating boxes each containing one piece of each hot-steel piece will cause the strength of the bottom heat-insulating box body to become insufficient, so It is not possible to stack more than two tiers, requires a wide shipping area, and has a very poor loading efficiency. In order to respond to the increase in the transportation volume of hot steel billet as the demand for billet grows, either large vessels that require deep water depth must be operated or the number of flights operated by the vessels must be increased. However, there is a limitation that it is not possible to efficiently mass-transport and mass-produce hot steel slabs in large quantities to meet demand. It is substantially difficult to carry out land transportation instead of such sea transportation, and if it is carried, it is a drawback that enormous transportation cost is required.

Further, if the strength of the heat-insulating box body is increased in order to increase the number of sheets to be stacked in the boat, the self-weight of the heat-insulating box will inevitably increase. Since the height is low with respect to the bottom area and only one piece of hot steel is loaded into one heat insulating box, the heat capacity of the hot steel pieces inserted in the heat insulating box is inevitably small. However, since the temperature decrease is suppressed only by the heat insulating effect of the heat insulating material filled in each surface of the heat insulating box, there is a drawback that the temperature decrease proceeds relatively quickly and the temperature is easily lowered.
Furthermore, for the land transportation from the production site of this hot billet to the coastal cargo handling area, and from the coastal cargo handling area where the ship arrived to the hot rolling process, the hot billet charged in a large-weight heat-insulating box is transported. Since it had to be transported one by one, the frequency of transportation increased and it was very uneconomical. Coastal loading and unloading work, such as transportation of hot steel bills from a vehicle for transport into a ship's hold, was done by hanging wires with a warm insulation box inside the hot steel bills and using a crane to lift them. Since slinging work such as hanging wires on the heat-insulating box must be done carefully by hand in a well-balanced state, workability and work efficiency are poor and unstable due to accidental collision with other things. There was also a drawback that it was easy to get into a state and was unsafe.

[0007] Further, a ship that has completed the transportation of the hot steel bills may carry hot-rolled hot coils of the hot steel bills or the like on its return route and carry it by sea, but at this time it must be transported. The empty insulation box from which hot steel slabs, which are not related to products such as hot coils, must be transported by sea to load and return to this vessel, so the loading rate will decrease even on the return trip. However, there was a drawback that the efficiency of marine transportation was very poor.

[0008]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks of the prior art, and when the temperature falls below a certain temperature such as brittleness at 475 ° C., the steel slabs are broken during the cooling, and grinding occurs. The hot steel billet that sometimes cracks or abnormal quality occurs in the rolled steel strip coil, is in a state where the temperature drop is efficiently suppressed, and it is excellent in shipping workability, safety, and labor saving. A hot steel billet that can be transported by sea while operating safely, and that can be transported in large quantities as much as possible while improving the loading efficiency of hot billet and the land transport efficiency of hot billet accompanying this maritime transport. It is an object of the present invention to provide a shipping method and a heat insulating container for shipping suitable for carrying out this method.

[0009]

Means for Solving the Problems As a result of various studies for solving the above problems, the inventors have found that a hot steel slab produced mainly by continuous casting or slabbing, which is required to suppress temperature drop, is , The height is low relative to the bottom area, and all of them are not the same size in the shape of a rectangular parallelepiped, and their weight is very heavy. It is not possible to stack multi-tiered vessels inside the boat by transporting them using a heat-insulating box in which steel pieces are loaded and a lid is placed, and as a result, a space where items can still be loaded in the height direction inside the boat. Must be operated and transported by sea in a state where there is a sufficient amount of heat remaining, and also in the case of land transport accompanying this sea transport, not only this warm steel slab but also a large heat insulation box with its own weight must be transported one by one. Therefore, the transportation frequency is high. When transporting hot steel pieces produced by continuous casting or slabbing that require suppression of this temperature drop, by sea, at the specified position on the bottom plate of the ship's ship, a heat insulating layer is placed inside. After installing the flat plate mounting table formed in the state of having a plurality of hot steel pieces stacked on the flat plate mounting table, the bottom is open and inside each surface. If the rectangular parallelepiped heat retaining cover formed in the state having the heat insulating layer is placed on the flat plate placing table in a state in which the hot steel pieces are included, mainly the loading rate of the ship is improved. The fact that the temperature drop of the hot steel billet can be efficiently suppressed is that if the flat plate mounting table and / or the heat insulating cover is further provided with heating means and heating is performed as necessary, the effect of suppressing the temperature drop of the hot steel billet can be suppressed. To find out what can be done further It was completed the present invention.

The method for shipping hot steel slabs according to the present invention and the thermal container for shipping suitable for carrying out this method will be described below in detail with reference to the drawings. 1 is an explanatory plan view showing an example of the arrangement of a heat retaining container for shipping at the bottom of a ship when the method of the present invention is carried out, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is related to the present invention. FIG. 4 is a perspective view showing one embodiment of the shipping heat insulation container, FIG. 4 is a vertical cross-sectional explanatory view of the shipping heat insulation container shown in FIG. 3, and FIG. 5 is an explanatory view showing a hot coil loading state in a return ship. To carry out the method of the present invention,
For example, as in the ferrite single-phase stainless steel represented by the formula disclosed in Japanese Patent Publication No. Sho 63-32527 by the present applicant, the slab breaks during cooling due to brittleness at 475 ° C. or during grinding. Hot steel produced by continuous casting or slabbing that requires suppression of temperature drop, such as steel that cracks or abnormal quality occurs in hot-rolled steel strip coils and steels similar to this. When the piece 1 is transported by sea, first, the flat plate-shaped mounting table 2 is formed to have a heat insulating layer inside, and the bottom is opened and the heat insulating layer is formed inside each surface. A heat-retaining container for shipping according to the present invention, which comprises a heat-retaining cover 3 in the shape of a rectangular parallelepiped placed on the plate-shaped mounting table 2, is prepared.

When the hot steel slab 1 is loaded on the ship 9 and transported by sea, first, the flat plate mounting table 2 formed so as to have a heat insulating layer therein is mounted on the ship 9 as shown in FIGS. It is installed at a predetermined position on the bottom part 9a of the boat. In this flat plate-shaped mounting table 2, a plurality of reinforcing members 2c are arranged at predetermined intervals between an upper plate 2a and a bottom plate 2b each made of a steel plate, and the upper plate 2a, the bottom plate 2b, and the reinforcing member 2c are formed. The enclosed space is filled with a heat insulating material to form a heat insulating layer 2d. As this flat plate-shaped mounting table 2, for example, an upper plate 2a having an area (for example, 2800 × 12100 mm) larger than the largest bottom area of the hot steel piece 1 to be mounted on the upper surface and having a thickness of 9 mm is used. Between the top plate 2a and the bottom plate 2b having the same size and shape and a thickness of 6 mm, the width of the flange portion is 100 mm, the thickness is 5.5 mm, the height of the web portion is 200 mm, and the thickness is 8 mm. The reinforcing members 2c made of H-shaped steel are arranged at substantially equal intervals in the longitudinal direction at least directly below the hot steel pieces 1, and a large weight of the hot steel pieces 1 is placed on the upper plate 2a. It has the strength to withstand a plurality of sheets placed, and the top plate 2a and the bottom plate.
It can be shown that the space surrounded by 2b and the reinforcing material 2c is filled with a heat insulating material such as glass wool to form the heat insulating layer 2d. Further, as shown in FIG. 3, a mounting member provided on the boat bottom 9a of the ship 9 is attached to the plate-shaped mounting table 2.
A detachable connecting member 4 for detachably fixing to 9b is provided, and a wire for suspending and suspending the flat plate-shaped mounting table 2 or a shackle for hooking the wire is engaged. The hanging metal fitting 5 is provided. In the illustrated embodiment, the attachment / detachment connecting member 4 has a projecting piece having a through hole 4a into which the rod 8 with a ring is inserted and fixed to the side surface of the flat plate-shaped mounting table 2, and the bottom of the boat. The attaching member 9b of 9a is also a member to which a protruding piece having a through hole 9c into which the rod 8 with a ring is inserted is fixed similarly to the attaching / detaching connecting member 4. Further, the hanging metal fitting 5 is one in which a protruding piece having a through hole 5a into which a wire or a shackle for hooking the wire is inserted is fixed to, for example, a guide member 7 described later. In order to install such a plate-like mounting table 2 on the bottom 9a of the boat, the hanging metal fitting 5
A wire or a shackle for hooking the wire is attached to the seashore, or a crane owned by the ship itself or at a predetermined position of the ship bottom 9a, that is, the connecting / disconnecting member 4 for attachment / detachment.
And the mounting member 9b are conveyed to positions where the centers of the through holes 4a and 9c are aligned with each other, and the rod 8 is inserted into the through holes 4a and 9c to install and fix the flat plate-shaped mounting table 2 on the ship bottom 9a. You can Further, as shown in FIG.
Inside the heat insulating layer 2d formed of a heat insulating material such as glass wool, the electric power generated in the steam pipe or the ship 9 into which the steam generated in the ship 9 is introduced or the ship 9 is supplied to supply the Joule heat. It is preferable to provide a heating means such as a heating element that generates heat and heat the steel sheet 1 as necessary, because the temperature decrease of the hot steel piece 1 can be suppressed more effectively.

As described above, since the plate-shaped mounting table 2 is removably installed on the ship bottom 9a of the ship 9, the area of the upper plate 2a and the bottom plate 2b in one plate-shaped mounting table 2 is the bottom surface of the hot steel piece 1. It is preferable that the size is slightly larger than the size and shape in order to improve the workability when attaching and detaching the flat plate-shaped mounting table 2 and to effectively utilize the inside area of the ship hold of the ship 9. At this time, the ship bottom 9a of the ship 9 is flat. 2 is larger than the area of the flat plate-shaped mounting table 2 as in the illustrated embodiment, the through-holes 4a of the attachment / detachment connecting members 4, 4 of the adjacent flat plate-shaped mounting tables 2 are formed.
Align the centers of 4a with the through-holes 4a, 4a and attach the rod 8
Is inserted and the flat plate-shaped mounting bases 2 are connected to the front and rear and / or the left and right while considering the loading amount and balance of the ship 9, and a plurality of flat plate-shaped mounting bases 2 are installed and fixed to the ship bottom 9a.

Then, a plurality of hot steel pieces 1 are sequentially placed on the plate-shaped mounting table 2 fixed and installed on the bottom 9a of the ship 9 in a state of being stacked upward. Thereafter, the rectangular parallelepiped shape heat-retaining cover 3 having an opening at the bottom and having a heat insulating layer inside each surface is placed on the above-mentioned flat plate-like mounting table 2 in a stacked state. The warm steel piece 1 contained therein is placed on the flat plate-shaped placing table 2 in a state of being enclosed. As shown in FIGS. 3 and 4, the heat insulating cover 3 is an outer wall plate on each surface.
A plurality of reinforcing members 3c are arranged at a predetermined interval between the inner wall plate 3b and the inner wall plate 3a, and a heat insulating material is filled between the outer wall plate 3a and the inner wall plate 3b to form a heat insulating layer 3d. There is something. For example, as the heat insulating cover 3 to be used together with the flat plate mounting table 2 described above, the side surface and the upper surface each have a web portion height of 100 mm and a flange on the inner surface side of the outer wall plate 3a having a thickness of 6 mm. A plurality of unequal angle steels each having a width of 75 mm and a thickness of 7 mm are arranged and fixed as a reinforcing member 3c at predetermined intervals, and an inner wall plate 3b is formed on the opposite side of the reinforcing member 3c from the outer wall plate 3a. The wire mesh is fixed and this outer wall plate
The space between 3a and the wire net is filled with a heat insulating material such as glass wool to form a heat insulating layer 3d, and the inner wall plate 3b on the upper surface is the bottom of the warm steel piece 1 placed on the flat plate-shaped mounting table 2. The size and shape are slightly larger than the area, and the inner wall plate 3b on the side surface has a size higher than the height to the upper surface of the predetermined number of hot steel pieces 1 stacked on the upper plate 2a of the flat plate-shaped mounting table 2. You can show things. Further, in the heat insulating layer 3d formed of a heat insulating material such as glass wool, which is filled on each surface of the heat insulating cover 3, steam piping for introducing steam generated in the ship 9 or electric power generated in the ship 9 is introduced. If a heating means such as a heating element for supplying Joule heat is provided and heating is possible as necessary, it is possible to more effectively suppress the temperature decrease of the hot steel piece 1. preferable.

On the upper part of the heat insulating cover 3 for detaching, the same or similar tongue for sandwiching and transporting the warm steel piece 1 for easy transfer of the heat insulating cover 3 is sandwiched. A held member 6 is provided. The tongs for sandwiching and transporting the hot steel slab 1 are used when the hot steel slab 1 is transported on the loading platform of a land transport vehicle or by this vehicle and is transferred from a predetermined temporary placement platform to the flat plate-shaped placement platform 2. ,
Since both sides of the hot steel piece 1 are strongly pinched by the claws and a fall prevention hook for preventing the hot steel piece 1 from falling during transfer is provided below the claws, it is used. As the sandwiched member 6 for use, for example, a sandwiched portion is formed on the upper surface of the heat insulating cover 3 at which a steel plate strongly sandwiched by the tongue's claw is erected at a predetermined interval, and between the sandwiched portions. A structure can be shown in which a plurality of reinforcing steel plates are provided, and a space 6a into which the hook for preventing the fall of the tongs is inserted is formed between the sandwiched portion and the upper surface of the heat insulating cover 3.

Further, the heat insulating cover 3 is attached to the flat plate-shaped mounting table 2
It is preferable that a guide member 7 that guides and holds the side surface of the heat insulating cover 3 is provided on the upper plate 2a of the flat plate-shaped mounting table 2 when it is to be mounted on and is mounted thereon. .. As the guide member 7, the lower side surface of the heat insulating cover 3 that descends toward the upper plate 2a of the flat plate-shaped mounting table 2 can be guided and can be securely held once it is placed on the upper plate 2a. A member made of, for example, a steel plate, which is erected at a predetermined position, can be shown, and when the flat plate-shaped mounting table 2 and the heat insulating cover 3 shown in the figure are formed to have the above-described dimensions and shape, the thickness is The steel plate is erected in a substantially U-shape so as to hold the side faces on both sides in the longitudinal direction of the heat insulating cover 3 and the positions in the vicinity of the side faces, and the upper part thereof has a shape bent to the side opposite to the heat insulating cover 3. Is preferred.

[0016]

When the method of the present invention is carried out by using the heat-retaining container for shipping having such a structure, the through hole 4 between the attachment / detachment connecting member 4 and the attachment member 9b is provided at a predetermined position on the ship bottom 9a of the ship 9.
The hot steel strips 1 are sequentially stacked on a plurality of flat plate-shaped mounting bases 2 which are fixedly installed on the bottom 9a of the ship by inserting the rods 8 into the through holes 4a and 9c with the centers of a and 9c aligned with each other. Since it is placed in a state in which it is placed in such a state, the heat capacity as a whole of a plurality of stacked hot steel pieces 1 becomes extremely large, and the inclusion of the whole stacked hot steel pieces 1 in a single heat insulating cover 3 is combined. Since the effect of suppressing the temperature decrease of the leverage 1 is increased, and the temperature 1 is piled up in the vessel of the vessel 9 to effectively utilize the vessel space. Hot Steel Slab 1 on One Ship 9
The load capacity of the slab is much higher than the conventional one, and the loading rate, and by extension, the marine transportation efficiency is improved, and it becomes possible to transport a large amount. Furthermore, since the frictional force between the hot steel slabs 1 is relatively large, The weight of the warm steel slab 1 is not likely to collapse due to the shaking of the vessel 9 and can be stabilized in a well-balanced manner.

Further, a guide member 7 is provided on the flat plate-shaped mounting table 2 which is installed and fixed to the bottom 9a of the ship hold and which controls the mounting position of the heat insulating cover 3 and also serves as a guide in this mounting. Although the heat insulating cover 3 is in contact with the flat plate-shaped mounting table 2 only at a small portion at the lower end of the side surface, the heat insulating cover 3 is provided.
Since it is possible to prevent the deviation of itself, it can be surely placed at a predetermined position on the flat plate-shaped placing table 2 and the warm steel piece 1 is displaced and collides with the inner wall plate 3b of the heat insulating cover 3. It is possible to prevent the collapse of the load of the hot steel piece 1.

Further, when the heat insulating cover 3 is provided with a heating means, the air in the heat insulating cover 3 is heated by utilizing this heating means, and the temperature decrease of the hot steel slab 1 can be surely suppressed. The flat plate mounting table 2 is also provided with a heating means, and when it is utilized as needed, the hot steel piece 1 mounted on the flat plate mounting table 2 is directly heated and the temperature decrease of the hot steel piece 1 is surely suppressed. You can do it.

Further, when the hot steel strips 1 are loaded in the hold of the ship 9, the flat plate mounting table 2, the hot steel strips 1 and the heat insulating cover 3 are individually transferred by a crane, so the heat insulating cover 3 is transferred during the transfer. And the warm steel slab 1 do not collide with each other, and the flat plate mounting table 2 and the heat insulating cover 3 are less likely to be damaged.

The vessel 9 that has transported the hot steel slab 1 by sea on the outward route often loads and returns a hot coil obtained by hot rolling the hot steel slab 1 on the return route, but as shown in FIG. Since the height of 3 is high, a warm steel strip 1
It is possible to operate the ship 9 with the hot coil etc. being loaded on the flat mount table 2 on which the ship 9 has been unloaded, and the heat insulation cover 3 being placed so as to wrap the hot coil etc., and the loading rate of the ship 9 is also improved. As a result, it is possible to reduce the vacancy rate, and to improve the overall transportation efficiency in addition to the effect of improving the loading rate on the outward route. Therefore, it is possible to transport a large amount and reduce the number of operating flights of the ship 9. The cost can be reduced.

[0021]

As described in detail above, the method for shipping hot steel slabs according to the present invention and the heat-retaining container for shipping suitable for carrying out this method have various effects as listed below. , Whose industrial value is very large.

A. It is possible to prevent breakage and cracking of the steel piece caused by 475 ° C. brittleness, etc. and abnormal quality of the hot rolled steel strip coil during hot rolling as the lowering minimum temperature of the hot steel piece increases. Since the hot steel pieces are loaded with a very large heat capacity by sequentially stacking a plurality of hot steel pieces at a predetermined position in the ship's hold, the temperature drop can be efficiently suppressed and the hot steel pieces can be suppressed. It is possible to ensure good quality of the hot coil when hot-rolled without any abnormality. Further, if a heating means is provided on the plate-shaped mounting table and / or the heat insulation cover and heating is performed as necessary, the temperature decrease can be suppressed more effectively. Therefore, in the case of manufacturing such steel through sea transportation, even if the arrival at the destination port is delayed due to stormy weather or the unloading work of hot steel slabs at the coastal cargo handling site is delayed, It is not necessary to worry about the temperature decrease of the piece, and stable production can be performed without any problems in terms of quality and yield.

B. Not only the work of transferring hot steel slabs from the transportation vehicle into the ship's hold and the work of transferring hot steel shards from the ship's hold into the transport car, but also the work of transferring the heat insulation cover can be performed with tongs. Therefore, a troublesome work such as hanging a wire is not required, and workability, work efficiency and safety are improved.

C. Since the hot steel pieces are loaded in a stacked state, the hot steel pieces corresponding to the loading capacity of the ship, the effective loading area of the bottom of the ship, etc. can be loaded. Since a large amount of hot steel slabs can be transported according to the demand of the strips, it is very effective in labor saving in combination with the effect of the above b, and the production plan and the process promotion thereof can be facilitated.

D. Even in the case of land transportation of hot steel slabs associated with such sea transportation, it is no longer necessary to transport the slabs individually with a large heat-insulating box as in the past, and a plurality of hot steel slabs are stacked on the bed of the transport vehicle. It is also possible to stack and transport, and the frequency of this transportation can be reduced, and the efficiency of land transportation is improved.

E. Ships that transport hot steel bills on the outbound route often load hot coils of hot rolled steel billets on the return pass, but since the height of the heat insulation cover is high, the hot steel strips are unloaded on the return pass. It is possible to operate a ship with hot coils etc. loaded on a flat plate mounting table and a heat insulation cover placed so as to wrap the hot coils etc., and the loading rate of the ship is improved and the churn rate is reduced. It is possible to reduce the number of flights operated by the ship together with the effect of c, and d
Since it is possible to improve the comprehensive transportation efficiency including the effect of, the transportation cost can be reduced and the labor can be saved.

F. It becomes easy to effectively utilize the equipment between different steel mills, and it becomes possible to improve the operating rate of the equipment.

G. Since the flat plate mounting table on which multiple pieces of hot steel pieces are placed is removable from the ship's hold, it is not necessary to prepare a dedicated vessel that is used only for the transportation of hot steel pieces, Accordingly, by removing the flat plate-shaped mounting table from the bottom of the boat, the boat can be returned to a normal boat.

H. Even in the case of land transportation from the heat insulation pit of the factory, the hot steel pieces can be stacked on the transportation vehicle by using the tongs, and the work of hooking wires is not required when the hot steel pieces are loaded. Therefore, the work can be carried out rapidly, the transportation efficiency can be improved even in the land transportation, and the temperature decrease of the hot steel billet can be suppressed from the stage of the land transportation.

I. The hot steel slabs are placed in a stacked state on the flat plate placing table, and because the frictional force between the hot steel slabs is relatively large, it is difficult for the cargo to collapse due to the shaking of the ship during operation. If the guide member is provided on the heat insulating cover, the heat insulating cover will not be displaced, so that the heat insulating cover and the hot steel piece are prevented from colliding with each other, and the load of the hot steel piece is less likely to collapse.
Excellent safety in ship operation.

J. Since the load of the hot steel slab is exclusively received by the flat plate-shaped mounting table having strong strength, the flat plate-shaped mounting table and the heat insulating cover are not easily damaged.

[Brief description of drawings]

FIG. 1 is an explanatory plan view showing an example of the arrangement of a heat-retaining container for shipping at the bottom of a ship when the method of the present invention is carried out.

FIG. 2 is a cross-sectional view taken along the line AA in FIG.

FIG. 3 is a perspective view showing one embodiment of a shipping heat retaining container according to the present invention.

FIG. 4 is a vertical cross-sectional explanatory view of the shipping heat retaining container shown in FIG.

FIG. 5 is an explanatory view showing a loaded state of hot coils in a return vessel.

[Explanation of symbols]

 1 hot steel piece 2 flat plate mounting base 2a upper plate 2b bottom plate 2c reinforcing material 2d heat insulating layer 3 heat insulating cover 3a outer wall plate 3b inner wall plate 3c reinforcing material 3d heat insulating layer 4 attachment / detachment connecting material 4a through hole 5 hanging metal fitting 5a through hole 6 Clamped member 6a Space 7 Guide member 8 Wheeled rod 9 Ship 9a Ship bottom 9b Mounting member 9c Through hole

Claims (7)

[Claims] 1. When transporting a hot steel slab (1) mainly produced by continuous casting or slabbing, which is mainly required to suppress a temperature drop, to a predetermined position on the bottom (9a) of a ship (9) of a ship (9). A flat plate-shaped mounting table (2) formed so as to have a heat insulating layer (2d) inside is installed, and a plurality of hot steel pieces (1) are sequentially stacked on the flat plate-shaped mounting table (2). After being placed on the base, a rectangular parallelepiped-shaped heat-retaining cover (3) having an opening at the bottom and having a heat insulating layer (3d) inside each surface is attached to the hot steel strip.
A method for loading hot steel slabs, characterized in that (1) is placed on the flat plate-shaped mounting table (2) in a state of being enclosed. 2. Hot steel placed on the flat plate-shaped mounting table (2) and enclosed by the thermal insulation cover (3) by a heating means provided on the mounting table (2) and / or the thermal insulation cover (3). The method for shipping hot steel pieces according to claim 1, wherein the pieces (1) are heated. 3. A ship bottom (9a) of a ship (9) capable of stacking and mounting a plurality of hot steel pieces (1) mainly manufactured by continuous casting or slabbing and mainly required to suppress temperature drop. )
A plate-like mounting table (2) which is detachably attached to a mounting member (9b) provided in the inside and has a heat insulating layer (2d) inside.
And the bottom is open and a heat insulation layer (3d) inside each surface
A rectangular parallelepiped which is formed on the flat plate-shaped mounting table (2) and which is placed on the flat plate-shaped mounting table (2) with the hot steel pieces (1) stacked therein. A heat insulating cover (3), and a detachable clamped member (6) that is the same as or similar to the tongs that nips and conveys the hot steel strip (1) is provided above the heat insulating cover (3). A thermal insulation container for shipping characterized by being provided. 4. A flat plate-shaped mounting table (2) is provided with a plurality of reinforcing members (2c) between an upper plate (2a) and a bottom plate (2b) each made of a steel plate. (2a), bottom plate (2b) and reinforcement (2
c) The space surrounded by and is filled with insulation material (2d),
The shipping heat insulation container according to claim 3, wherein a guide member (7) for restricting a mounting position of the heat insulation cover (3) is provided on the upper plate (2a). 5. A plate-shaped mounting table (2) capable of guiding the side surface of the heat-insulating cover (3) when the guide member (7) is mounted on the plate-shaped mounting table (2). (5) The heat-insulating container for shipping according to claim 4, which is a member standing upright at a predetermined position on the upper plate (2a). 6. A plurality of reinforcing materials (3c) are arranged between the outer wall plate (3a) and the inner wall plate (3b) on each surface of the heat insulation cover (3), and these outer wall plates (3a) ), The inner wall plate (3b) and the reinforcing material (3c) are filled with a heat insulating material (3d).
The thermal insulation container for shipping according to any one of 1 to 5. 7. A flat mounting table (2) and / or a heat insulating cover
The shipping heat insulation container according to any one of claims 3 to 6, wherein a heating means is provided in (3).