JP2006309573A - Production plan preparation system and method for steel products - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the production plan preparation system and method of steel products for preparing a precise plan corresponding to the transportation method of products, and for more improving the transporting efficiency of products than a conventional manner. <P>SOLUTION: This production plan preparation system of steel products for shipping products manufactured by a steel manufacturing facility having one or more manufacturing lines corresponding to models is provided with: an expected plan preparing means for preparing an expected production plan from the expected order of products; a real plan preparing means for replacing the expected order of this plan with a real order, and for preparing a real preparation plan from the term of delivery of the contract of the real order; and a correcting means for, when preparing the real production plan by the real plan preparing means, correcting the date of delivery of contract to the use scheduled date of products of a client when products are domestically transported by land, and for correcting the date of delivery of contract to the date of the allocation of a ship when products are domestically transported by sea, and for correcting the real production plan without correcting the date of delivery of contract when products are transported abroad by sea. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a steel product production plan creation system and a production plan creation method for shipping products from an ironworks having a plurality of manufacturing processes.

Conventionally, when manufacturing steel products, the restrictions on production lots in the steelmaking and casting processes, which are the upper processes, are very strict, and in order to produce competitive products, a high yield in the production lot organization in the upper processes is required. Planning was essential. Also, from the operational aspect, it is important to maximize the operating rate of the owned equipment. For this purpose, for example, a hot rolling (hot rolling) process, a cold rolling (cold rolling) process, and plating ( It was necessary to accurately predict the supply and demand balance of the lower process having the (continuous galvanizing) process and to formulate a production plan. Furthermore, in order to fulfill delivery date promises to customers, it was necessary to create a production plan that takes into account the supply and demand balance of the lower process.
Regarding production planning, for example, contents centering on parts supply control (ie, inventory management) in the assembly industry such as automobiles are disclosed, but in this production plan, materials that mainly handle self-produced raw materials are disclosed. It was not compatible with industry. As a peculiarity of this material industry, for example, in the steel industry, the production efficiency factors of each manufacturing process (for example, steelmaking converters are component units, hot rolling is the heating temperature) are different. If the ability is oriented, there is a risk of having a contradictory element.

Therefore, as a production plan to be applied to the material industry, for example, in Patent Document 1, a production lot organization is performed in consideration of the restrictions of steelmaking and hot rolling processes for an order group for one week. An interactive scheduling system linked to a production plan is disclosed.
Further, in Patent Document 2, an upper process for processing a group of production plans created in the retrospective plan creation process based on the first assortment constraint to create a rough production plan for the production lot of the upper process. The rough production process and the production order created in this coarse production process are processed based on the second assortment, and the production lot of the production process is refined. A method for creating a production plan for a steel intermediate product having an upper process fine planning process for creating a plan is disclosed.
In Patent Document 3, the target material sources are extracted from the order information, the order input information, and the delivery date information, and the information is aggregated for every port or riverbank. A method of providing is disclosed.
By the above method, it becomes difficult to delay the delivery date, and it is possible to operate the facility while suppressing the inventory of intermediate products.

JP-A-10-268908 JP 2003-256020 A JP 2002-91536 A

However, the conventional production planning has still had the following problems to be solved.
The method of Patent Document 1 is intended only for a selected order group, but the actual order group exists for one to two months, and a manufacturing plan is formulated based on a sales plan. Since a group of orders close to the weekly unit is selected and linked to manufacturing, there remains room for improvement in terms of application range and processing content.
In addition, in Patent Document 2, the constraint condition for creating a production plan is fixed to one type, and the accuracy of the created production plan cannot be sufficiently increased, and as a result, in order to aim for higher profits. Not reached.
And also in patent document 3, the constraint condition at the time of producing a production plan is being fixed to one kind, and has not led to high profit.
Further, in Patent Documents 1 to 3, the delivery date of the product is similarly corrected in any transportation method without considering the transportation method of the product, for example, domestic land transportation, domestic sea transportation, or overseas sea transportation. Products are shipped based on the production plan created in For this reason, even when products are transported by the same transportation method, their shipping times are likely to be different, and many of the products cannot be transported at the same time, so the transportation efficiency of the products is poor and not economical.

The present invention has been made in view of such circumstances, and can produce a precise plan corresponding to a product transportation method and can improve the product transportation efficiency of a steel product production plan creation system and production plan creation method thereof. The purpose is to provide.

A production plan creation system for a steel product according to the first invention that meets the above-mentioned object is a production plan creation system for shipping a product produced by a steel production facility having one or more production lines depending on the product type.
A prospective plan creation means for creating a prospective production plan for producing the product by a plurality of manufacturing apparatuses constituting the production line based on a prospective order of the product;
Actual plan creating means for replacing the prospective order with an actual order and creating an actual production plan from the prospective production plan based on a contract delivery date of the actual order;
When the product is shipped domestically when the actual production plan is created by the actual plan creation means, the contract delivery date is corrected to the expected use date of the customer's product, and the product is shipped domestically. Correcting means for correcting the actual production plan without correcting the contract delivery date when the contract delivery date is corrected and the product is shipped overseas.

In the production plan creation system for steel products according to the first invention, the prospective plan creation means creates a plurality of the prospective production plans based on the prospective orders, and is predetermined for each prospective production plan. Calculate the difference between the total sales price calculated from the shipment volume of the product within the set period and the total variable cost of the processing amount of the product within the set period required until the product can be shipped. It is preferable to select a prospective production plan that will increase.

In the steel product production plan creation system according to the first aspect of the present invention, preferably, the prospective production plan is a long-term monthly production plan, and the actual production plan is a short-term daily production plan.

In the production plan creation system for steel products according to the first invention, the plurality of manufacturing apparatuses constituting the manufacturing line include an iron source manufacturing apparatus comprising a converter and manufacturing means incidental thereto, and downstream of the iron source manufacturing apparatus. One or more processing devices are preferably arranged on the side.

The steel product production plan creation method according to the second aspect of the present invention, which uses the steel product production plan creation system according to the first aspect, creates a plan from product production to shipment.

Since the production plan creation system for steel products according to claims 1 to 4 and the production plan creation method for steel products according to claim 5 have prospective plan creation means, actual plan creation means, and correction means, You can create a detailed plan from product production to shipping. Further, since the contract delivery date or the actual production plan is corrected for each product transportation method by the correcting means, it is possible to create a precise production plan in which the transportation timing of many products can be adjusted to the same time.
As a result, the transportation efficiency of the product can be improved more than before, which is economical.

In particular, in the production plan creation system for steel products according to claim 2, the total of the sales price of the product and the variable cost of the processing amount are calculated for each of the plurality of potential production plans created based on the prospective order by the prospective plan creation means. Since the total difference is calculated, it is possible to select a prospective production plan that can obtain higher profits than before.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is a flow chart of a production plan creation method using a production plan creation system for steel products according to an embodiment of the present invention, and FIG. 2 is a daily list of conditions without capacity constraints created by the production plan creation system. FIG. 3 is an explanatory diagram of a daily production plan with a capacity constraint created by the production plan creation system, and FIG. 4 is an explanatory diagram of an arrangement of computers to which the production plan creation system is applied. .

A steel product production plan creation system (hereinafter also simply referred to as a plan creation system) according to an embodiment of the present invention is disposed on an iron source manufacturing apparatus having a converter and on the downstream side of the iron source manufacturing apparatus. A production plan creation system for shipping a product produced by a steel production facility having one or more production lines equipped with other processing devices according to the product type, and created based on a prospective order of the product When creating a short-term daily production plan (an example of an actual production plan) based on an actual order from a long-term monthly production plan (an example of a prospective production plan), The contract delivery date or daily production plan is modified to create a precise plan, which improves the transportation efficiency of products. This will be described in detail below.

As shown in FIG. 4, the steel product production plan creation system includes data storage means, prospective plan creation means, actual plan creation means, and correction means, and can input and delete data. It is constructed in the computer 11 capable of transmitting and receiving the data. Each process of the data storage means, the prospective plan creation means, the actual plan creation means, and the correction means is executed by a program stored in a storage device in the computer 11. Here, each means is not configured to be a single computer 11, and can transmit / receive data to / from the host computer 10, and can also transmit / receive data to / from each other. It is also possible to construct. At this time, the processing of each means constructed in each of the computers 12 to 14 is executed by a program stored in a storage device in each computer.
The data storage means includes an order storage unit, an equipment capacity storage unit, an equipment operation storage unit, an equipment repair storage unit, a passing process storage unit, a lot summary storage unit for each process, a sales price storage unit, and a variable cost storage unit. ing.

The order storage unit stores order quantity, transportation method, and delivery date data for each kind of order and each destination.
Here, the orders include a prospect (past performance) order and an actual order.
The product type means the type of the final product, and the classification level (hierarchy) differs between the monthly production plan and the daily production plan.
Variety used to create monthly production plan means, for example, hot rolled (hot rolled) coil, cold rolled (cold rolled) coil, thin plate, electromagnetic steel plate, stainless steel plate, thick plate, long bar, or section steel To do.
On the other hand, the product used for creating the daily production plan means a finer product than that of the monthly production plan, and means a product that is subdivided by the main passing process. For this reason, the varieties of daily production plans are different varieties, for example, even in the same hot-dip galvanized steel sheet, due to the difference in the passing process (hot rolling or cold rolling) of the steel sheet used for the plating treatment, It differs depending on whether continuous annealing or box-type annealing is performed.

Note that the product production line is also determined by determining the product type.
The production line includes a plurality of production apparatuses, that is, an iron source production apparatus comprising a converter and production means for performing secondary refining and continuous casting incidental to the converter, and one or more arranged at the downstream side of the iron source production apparatus. It is comprised with the processing apparatus (For example, the apparatus which performs any 1 or 2 or more processes of hot rolling, cold rolling, annealing, and surface treatment (galvanization etc.)).
Here, the iron source manufacturing apparatus is arranged in an iron source process (also referred to as a steel making process).

And as a transportation method, there exist domestic land transportation, domestic sea transportation, and overseas sea transportation, for example.
Domestic land transportation includes, for example, truck transportation, and domestic sea transportation includes, for example, domestic shipping by a small ship.
As overseas shipping, there is transportation by medium-sized (maximum loading capacity is, for example, about 2,000 to 3,000 tons or less) or large-sized ships (maximum loading capacity is, for example, about 10,000 tons). The shipping by this ship is less frequently possible to enter the port than the domestic shipping (for example, about 3 to 5 times a month), and more than one product can be loaded and transported.

The equipment capacity storage unit stores data on production volume per unit time (ton / hour) for each product type in each manufacturing device, and the equipment operation storage unit stores constraints and operation shifts when switching between product types in each manufacturing device. Is stored. Here, the constraint condition means, for example, the stop of the production line or the change of the steel plate pass line in accordance with the change of the product type in the production line (for example, hot dip galvanizing line) for plating on the surface. Moreover, even if the production line is not stopped, for example, in the cold rolling process, schedule constraints for sequentially passing the steel sheet from a wide width to a narrow width (when rolling with the same roll) are performed. There is also.
The operation shift is determined based on the operation status of each manufacturing apparatus, that is, the working mode (for example, 2 shifts or 3 shifts) of the worker to be operated.
In addition, when the same manufacturing apparatus is installed in multiple numbers, for example, when the cold rolling apparatuses A to C (plurality) are installed, data of a plurality of equipment capacity patterns that can be adopted, and a plurality of equipment operation patterns The data of (1) A to C can be used, (2) Only A can be used, (3) Only B can be used. It is preferable to store it in the section.

The equipment repair storage unit stores data of repair and construction period and start date of each manufacturing apparatus. Here, if it explains taking the repair plan of the cold rolling apparatus of A to C as an example, the possible suspension period (start date / time and end date / time) and construction period time can be set for each cold rolling apparatus.
Thus, when the cold rolling apparatuses A to C are installed, the order of a plurality of constructions that can be adopted, that is, (1) A → B → C, (2) B → A → C, (3) C It is preferable to store the equipment repair pattern data such as → B → A in the equipment repair storage unit.
The passage process storage unit stores the necessary passage process specification of the production line described above for each product type, that is, data of the passage essential process.
The lot summary storage unit for each process is a management condition when operating the manufacturing apparatus of each process, for example, the upper limit value and the lower limit value of the thickness of the steel sheet to be rolled in the cold rolling process, and the annealing temperature in the annealing process. The data which respectively specified the upper limit value and the lower limit value is stored.

The selling price storage unit stores selling price (yen / ton) data for each product type. Here, examples of the selling price include a domestic price A, a domestic price B, an export price A, and an export price B.
The variable cost storage unit stores variable costs (yen / ton) for each passing process and each kind of production line. Here, the variable cost is, for example, about two converters in the case of an iron source process, about one hot rolling in the case of a hot rolling process, and about electrogalvanizing and tin plating in the case of a surface treatment process, The cost required for manufacturing is set.
Each storage unit described above constitutes a data storage unit. The data in each storage unit is stored in a database.

Based on the prospective order (past past results) of the product, the prospective plan creation means of the plan creation system prepares multiple monthly production plans from product delivery date to production, and then stores the monthly production plans selected from these To do.
When making a plurality of monthly production plans, the contract delivery date for each product type is used based on each data in the order storage unit. Note that when making a monthly production plan, most of the orders are prospective orders, but actual orders may be included.

Based on this contract delivery date, a rough production plan is drawn up from the final process (product process) of each production line to the converter in order for each product type to be shipped. The production plans are rearranged, and a plan from the converter to the final process of the production line is drawn up based on the rearranged rough production plan. When planning this plan, each data of the order storage unit, the equipment capacity storage unit, the equipment operation storage unit, the equipment repair storage unit, and the passage process storage unit is used.
For the monthly production plan creation process, it is also possible to use software called “Production Planner” sold by Aspentech Broner.

Next, based on a plurality of monthly production plans created, it is necessary to make the total of the sales price calculated from the shipment amount of the product within a predetermined setting period (for example, one month) and the product can be shipped. Calculate the difference in the total variable costs of the product processing amount within the set period, and select the monthly production plan that maximizes the difference. This difference is called throughput (TP), which is a management index of revenue.
(TP) = (Sales unit price) × (shipment amount) − (variable cost unit price) × (processing amount)
Here, the processing amount includes the amount processed within the period even if the product is not shipped (that is, the product inventory amount). By reducing the product with the amount of processing, it is possible to make a plan that increases the throughput and enables higher profits.
In this calculation process, each data of the order storage unit, the sales price storage unit, and the variable cost storage unit is used.

The actual plan creation means of the plan creation system replaces the prospective order of the monthly production plan selected by the prospective plan creation means with the actual order, and creates and stores the daily production plan.
Here, when creating the daily production plan, the actual product type in the order storage unit is compared with the product type of the expected order that satisfies the contract delivery date, and the expected order of the matching part is actually Replace with an order. Then, based on the replaced actual order, a daily production plan is drawn up from the converter to the final process of the production line.
When creating this daily production plan, it is created using each data of the equipment capacity storage unit, equipment operation storage unit, equipment repair storage unit, and lot summary storage unit for each process.
It should be noted that the aforementioned “production planner” software can also be used for the daily production plan creation process.

When the daily production plan is created by the actual plan creation means, the correction means is for each delivery method of the product, i.e., domestic land transportation, domestic sea transportation, or overseas sea transportation. It is a correction.
In the case of domestic land transportation, the contract delivery date of the product is set to Just in time delivery (conveyed on the specified date) or automatic shipment upon completion of the customer (customer) depending on the customer's request (scheduled date of use of the customer's product) (Some shipments to nearby port warehouses or direct delivery)
In the case of domestic shipping, the contract delivery date of the product is obtained from the plan of the ship's allocation date, that is, which ship berths on which quay and for how long (until it berths and leaves). Will be corrected on the berthing date of the ship. In this way, the contract delivery date is corrected on an as-needed basis in accordance with the ship allocation date while confirming the production status of the product.

In the case of overseas shipping, the daily production plan created by the actual plan creation means is corrected without correcting the contract delivery date of the product. This is because the frequency of entering the port is less than in domestic shipping, and in this case, the contract delivery date is the berth date of the ship obtained from the quay work plan (berth plan: for example, Japanese Patent Application No. 2005-111241). Is used. Here, the quay work plan means a series of cargo handling work plans for deciding which ship lands on which quay, loading products, and leaving the berth.
And a daily production plan is created using, for example, each constraint condition of the equipment capacity storage unit, the equipment operation storage unit, and the equipment repair storage unit without changing the berthing date of the ship.

Next, a steel product production plan creation method according to an embodiment of the present invention will be described using the plan creation system described above with reference to FIG. For example, as disclosed in Patent Document 2, since it is substantially the same as the conventional method, the same parts will be described in a simplified manner.
First, monthly production plan data for creating a daily production plan is input. In addition, data obtained from the previous day's operation results or expected production is also input, and for example, the capacity error (result difference) of each manufacturing apparatus is corrected, and the remaining capacity of the manufacturing line is corrected.
This monthly production plan is created by the prospective plan creation means. Based on the order information input to the order storage unit, that is, the product type and the destination, the transportation method suitable for this condition is selected, and the product order is selected. Are compiled for each transportation method used for product shipment.

When preparing this monthly production plan, use the data in the equipment capacity storage unit, equipment operation storage unit, equipment repair storage unit, and passage process storage unit, based on the contract delivery date of the product, for each product type to be shipped. Create a plan that goes back to the iron source process in order from the final process of each production line. Using the rough production plan of the converter among the created plans, rearrangement is performed in order to aggregate products for each iron source of the same steel type.
Furthermore, on the basis of the production date of each iron source type arranged in the rough production plan of the rearranged converter, each of the facility capacity storage unit, the facility operation storage unit, the facility repair storage unit, and the passing process storage unit Using the data, create a plan from the converter to the final process of each production line.

In addition, when creating a plan that goes back to the iron source process in order from the final process of each production line and a plan that goes down from the converter to the final process of each production line, multiple equipment capacity patterns in the equipment capacity storage section, equipment operation storage section From the plurality of equipment operation patterns and the plurality of equipment repair patterns in the equipment repair storage unit, one piece of data is selected and used.
Thereby, the plan which considered the manufacturing capability of each manufacturing apparatus, the operation time, and the repair time can be created.
A plurality of monthly production plans created by the above method are stored by the prospective plan creation means.

Next, the throughput is calculated using the plurality of created monthly production plans.
Here, the sum of the sales prices is calculated by obtaining the product of the shipment amount of the products of the plurality of created production plans and the sales price unit price of the sales price storage unit. In addition, the total of variable costs is the amount of processing (including the amount of inventory) for each process on the production line that has passed until the product can be shipped in the multiple production plans created, and the fluctuation in the variable cost storage unit Calculate by calculating the product of the unit cost.
By the above method, the monthly production plan that maximizes the throughput is selected and stored by the prospective plan creation means.

The estimated order of the monthly production plan created in this way is transmitted from the host computer 10 installed in the head office, for example, and the actual order information (for example, product type) from the customer input to the order storage unit of the data storage means , Destination and delivery date information).
Then, a daily production plan is created for the downward plan of the monthly production plan described above. When creating this daily production plan, the contract delivery date or daily production plan is corrected for each product transportation method, and the equipment operation storage unit, the equipment repair storage unit, and the lot summary storage unit for each process. Use each data. At this time, when the product is transported domestically, the contract delivery date of the product is corrected to the request date of the customer's product, and when the product is transported domestically, the shipping date is corrected. However, if the product is shipped overseas, the daily production plan is corrected without correcting the contract delivery date of the product.

If the product is shipped domestically, the ship allocation date will be changed accordingly.
For example, when the final delivery date of a product is March 30, it is assumed that there are two ships (shipment dates are March 20 and March 25) on which the product can be shipped.
Here, a daily production plan is created based on the shipping date on March 20, and when the product can be shipped on March 23, the product is transported on March 20. The ship is changed from a ship having a ship allocation date to a ship having a ship allocation date from March 23rd to March 30th.
As this ship, there is a ship on March 25th. Therefore, the product is transported by this ship.
By performing the above operations, for example, every day, a more precise production plan can be created.

A daily production plan with no capacity constraint and a daily production plan with a capacity constraint are created as the daily production plans.
As shown in FIG. 2, the daily production plan with no capacity constraints falls from the iron source process to the product process on the production line without considering each constraint condition of the equipment operation storage unit and the equipment repair storage unit, for example. A plan is created so that the maximum operating capacity of each manufacturing apparatus can be grasped. When creating this plan, this amount is produced from the data of the production volume per unit time (ton / hour) for each product type in each manufacturing device in the equipment capacity storage unit and the amount for each product type based on the actual order. The time required to do this is calculated. Thereby, the operation rate of each manufacturing apparatus can be obtained from the operating time of each manufacturing apparatus and the operating time required for manufacturing the product.
Here, if the operating rate exceeds 100%, it means that the manufacturing capability of this manufacturing apparatus is the limit.

In addition, as shown in FIG. 3, the daily production plan with capacity constraint conditions includes, for example, each constraint condition (shaded area in FIG. 3) of the facility capacity storage unit, the facility operation storage unit, and the facility repair storage unit. It is a plan that makes it possible to grasp the delivery date of products manufactured by each manufacturing apparatus. When creating this daily production plan, the data in the lot summary storage unit for each process is used.
Here, if the delivery date of the daily production plan is later than the contract delivery date, it means that the delivery date is not in time.

And when giving priority to the operating rate of each manufacturing apparatus, that is, when bringing the operating rate of each manufacturing apparatus as close to 100% as possible, in the daily production plan with no capacity constraint, for example, the operating rate is set to 100%. The surplus part is transferred to a manufacturing apparatus whose operation rate is less than 100%, the delivery date is adjusted (for example, delayed), the processing amount for each product type is adjusted, and the daily production plan is determined.
In addition, when giving priority to product delivery dates, adjust the delivery date for each product order in the daily production plan with limited capacity, and for orders with sufficient delivery date, delay the production date and Determine production plan.

Next, the production plan (daily shipping plan) when the product is shipped overseas is corrected.
Here, since delivery date management is given the highest priority, each data of the equipment operation storage unit and the equipment repair storage unit is selected again, and a daily production plan is created again so as to satisfy the contract delivery date.
Then, after determining this daily production plan and storing it by the actual plan creation means, products are shipped by the respective transportation methods based on this plan.

As described above, the present invention has been described with reference to one embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and is described in the claims. Other embodiments and modifications conceivable within the scope of the above are also included. For example, a case where a part or all of the above-described embodiments and modifications are combined to form a steel product production plan creation system and production plan creation method thereof is also included in the scope of the present invention.
In the above embodiment, the case has been described where the production plan is a monthly production plan and the production plan is a daily production plan, but it is also possible to create a production plan for multiple months or years. It is also possible to create an actual production plan in units of multiple days or weeks.

And in the said embodiment, the monthly production plan including from shipping to production is created, and the production date is created by correcting the contract delivery date or the daily production plan for each transportation method from this monthly production plan. Explained the case. However, it is also possible to create a production plan by correcting the contract delivery date or the daily production plan for each transportation method based on a monthly production plan that considers only production without considering the shipping time. In creating the production plan, for example, software sold as a supply chain package described in Patent Document 2 can be used.

It is a flowchart of the production plan preparation method using the production plan preparation system of the steel product which concerns on one embodiment of this invention. It is explanatory drawing of the daily production plan of no capacity restrictions created with the production plan creation system. It is explanatory drawing of the daily production plan of the conditions with capacity restrictions produced with the same production plan creation system. It is explanatory drawing of the arrangement configuration of the computer to which the same production plan creation system is applied.

Explanation of symbols

10: Host computer, 11-14: Computer

Claims (5)

In a production plan creation system for shipping products manufactured at a steel production facility having one or more production lines depending on the type,
A prospective plan creation means for creating a prospective production plan for producing the product by a plurality of manufacturing apparatuses constituting the production line based on a prospective order of the product;
Actual plan creating means for replacing the prospective order with an actual order and creating an actual production plan from the prospective production plan based on a contract delivery date of the actual order;
When the product is shipped domestically when the actual production plan is created by the actual plan creation means, the contract delivery date is corrected to the expected use date of the customer's product, and the product is shipped domestically. The steel having correction means for correcting the actual production plan without correcting the contract delivery date when the contract delivery date is corrected and the product is shipped overseas. Product production planning system. The steel product production plan creation system according to claim 1, wherein the prospective plan creation means creates a plurality of the prospective production plans on the basis of the prospective orders, and is set in advance for each prospective production plan. Calculate the difference between the total sales price calculated from the shipment volume of the product within the period and the total variable cost of the processing amount of the product within the set period required until the product can be shipped, and the difference is the largest A production plan creation system for steel products, characterized by selecting a prospective production plan. 3. The steel product production plan creation system according to claim 1, wherein the prospective production plan is a long-term monthly production plan, and the actual production plan is a short-term daily production plan. A production plan creation system for steel products. The production plan creation system for steel products according to any one of claims 1 to 3, wherein the plurality of manufacturing apparatuses constituting the manufacturing line include an iron source manufacturing apparatus including a converter and manufacturing means incidental thereto. A production plan creation system for steel products, wherein the production system is one or more processing devices arranged downstream of the iron source production device. A production plan creation method for steel products, wherein a production plan from production to shipment is produced using the production plan creation system for steel products according to any one of claims 1 to 4.

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