JP3262564B2 - Steel plate quality design equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to quality design of steel plates such as thick plates, and more particularly to design of manufacturing conditions for new steel types.

[0002]

2. Description of the Related Art In a steel plate manufacturer, when an order is placed for a product, a skilled engineer refers to a complicated quality design manual and first searches for a steel type satisfying various mechanical test characteristics included in an order receipt. . The quality design manual describes information on mechanical test characteristics, component value ranges, and various manufacturing conditions for various steel types manufactured in the past. However, there are various conditions (various dimensions and mechanical test characteristics) included in the order details, and a steel type that completely satisfies those conditions is not always manufactured in the past. Therefore, if a steel type that satisfies the required quality of the order details cannot be found in the quality design manual, it is necessary to design the manufacturing conditions for the new steel type from the beginning.

When designing a new steel grade, conventionally,
The usage and manufacturing conditions are directly linked, and new manufacturing conditions are set based on the past manufacturing results of the steel type that was used in the same manner as the conditions described in the order details, and simulation was performed under those conditions.
Calculate the characteristic values of the steel material manufactured under the relevant conditions, check whether the calculated values satisfy the requirements of the order details, and update and simulate the manufacturing conditions until a satisfactory one is found. Was repeatedly performed.

[0004]

However, since there is no direct relationship between the use of the steel material and the manufacturing conditions, the conventional steel type design may lack consistency and consistency in the manufacturing method. Further, when a new use that has not been used appears, past production information cannot be used at all, so that a manufacturing method must be designed from the beginning, and the work involves enormous labor.

Accordingly, it is an object of the present invention to standardize design work by providing consistency in determination of a manufacturing method and to facilitate determination of a manufacturing method for a new use.

[0006]

In order to solve the above-mentioned problems, a steel sheet quality design apparatus according to the present invention comprises: input means for inputting information on order details including usage of a steel sheet; base material UT characteristics, MT
・ Required properties including PT characteristics, lame resistance and bendability
A first conversion table in which ranks of the required characteristics, ie, ranks of internal characteristics, corresponding to the uses are registered in advance for each use of the steel sheet, being classified in advance into an arbitrary number according to the severity.
Means: material grades including segregation and inclusions are classified into arbitrary numbers in advance according to their severity, and the ranks of the material grades that can satisfy the required properties are registered for each rank of the internal properties. A second conversion table means; a steel sheet manufacturing condition including a casting method and a slab processing method for satisfying the material quality is preliminarily divided into patterns for each material quality rank and registered. Third conversion table means; and a rank of the internal characteristic corresponding to the use of the order details input by the input means is obtained from the first conversion table means. Quality design means for obtaining the material quality corresponding to the above-mentioned second conversion table means, and obtaining the steel sheet production conditions corresponding to the obtained material quality from the third conversion table means.

[0007]

As the internal characteristics of the first conversion table means, those having a strong characteristic as an evaluation index of use performance, such as lame resistance, sour gas resistance, bendability, etc., are adopted. Has a great correlation with the usage. Further, the material quality including indexes such as segregation and inclusions has a great correlation with the performance of the steel sheet and also has a great correlation with the contents of the manufacturing conditions. That is, the use and the internal characteristics, the internal characteristics and the material quality, and the material quality and the manufacturing conditions can be associated with each other, so that the first, second and third conversion table means can be used. If this is the case, the contents of the manufacturing conditions can be systematically derived from the usage through the internal characteristics and the material quality. Further, in this way, for example, when a new use appears, it can be dealt with only by adding the information of the use to the first conversion table means, and the use has a strong correlation with the internal characteristics. Information to be added can be easily determined.

[0008]

FIG. 1 shows the configuration of an entire system according to an embodiment of the present invention. Referring to FIG. 1, the work station WS
1 (Hitachi 2050/32) is connected to the node of the network NW1, and is connected to the central computer via the communication control device (3725) connected to the network NW1. Also, another network is provided for the workstation WS1.
Work station WS2 (NSSU) via the network NW2
N4) are connected. In the system according to the present embodiment, the main processing of the quality design of the thick plate is executed by the work station WS1, and only the time-consuming material prediction calculation of the quality design is executed by the work station WS2. It is configured as follows. The central computer inputs the data of the order details to the work station WS1, and the information on the result of the quality design is returned from the WS1 to the central computer.

Although this embodiment comprises a central computer and a network of workstations, it is of course possible to use only a central computer alone.

In this quality design, actually, first of all, information on actual steel types that have been manufactured in the past is searched from a predetermined database, and a steel type that satisfies the specifications of the order details is searched. However, if an actual steel type that satisfies the order details is not found, the production conditions are designed for the new steel type, and the work stations are prepared based on a material prediction model in which the steel plates manufactured under the conditions are prepared in advance. WS2 predicts. Then, it is checked whether or not the predicted material satisfies the requirement of the order details, and the updating of the manufacturing conditions and the material prediction are repeated until a steel type satisfying the requirement is found.

The process of designing manufacturing conditions for a new steel type is executed by a quality design process 20 shown in FIG. Referring to FIG. 2, in the quality design process 20, the usage information of the order receipt 10 is input, and the mechanical characteristic table TBL is input.
1, a manufacturing condition 30 is generated with reference to the material quality table TBL2 and the manufacturing condition table TBL3.

FIG. 6 shows an example of input data (order details 10).
Shown in Referring to FIG. 6, in this example, the contents of the input data are classified into four items, ie, ordered product dimensions, contract specification mechanical tests, contract specification chemical components, and general items. Includes the thickness, width and length dimensions, and the mechanical test items specified in the contract specifications include the tensile strength range (minimum
n and the upper limit max) and the yield point range (lower and upper limits) are included, and the item of the chemical composition in the contract specification includes the range (lower and upper limits) of each content of phosphorus, sulfur and niobium (Nb),
General items include destination country, use code, and joint CO
Contains information about the D request. In this example, the usage code is "bridge". That is, it is known in advance that the steel sheet delivered based on the order details is used for a bridge.

FIG. 3 shows a part of the contents of the internal characteristic table TBL1. Referring to FIG. 3, in this example, as the items of the internal characteristics, the base material UT characteristics, the joint UT characteristics, and the MT · P
T characteristics, lame resistance, sour gas resistance, bendability, side bendability, and surface machinability are provided. The rank of each internal characteristic item (A, B, C, D) (Either or no designation) is registered. The usage is
There are categories such as general, bridge, high-rise building box column, penstock, surface cutting material, etc. As can be seen from the example of FIG.
There is a great correlation between the contents of each internal characteristic item of this table and its use. By referring to this table TBL1, for example, in the case of the order details shown in FIG. 6, since the usage code is "Bridge", the rank of the base material UT is A and other internal characteristic items are not particularly considered. Is obtained.

FIG. 4 shows a part of the contents of the material quality table TBL2. FIG. 4 shows only the tables related to the parent material UT characteristics and the MT / PT characteristics of the internal characteristics of the material quality table TBL2.
Tables are prepared for each item of T characteristics, lame resistance, sour gas resistance, bendability, side bendability, and surface machinability. Referring to FIG. 4, in this example, three types of segregation, MnS, and inclusions are prepared as types of material quality. For each rank of the internal property items (base metal UT property, MT / PT property), numerical values indicating the ranks of segregation, MnS, and inclusions are registered.

The material quality such as segregation, MnS, inclusions, etc. is determined by the internal characteristics (base material UT characteristics, joint UT characteristics, MT / PT).
Properties, resistance to lame, resistance to sour gas, bendability, side bendability,
And surface machinability) have a high correlation with
It also has a great correlation with the contents of the manufacturing conditions (casting method, slab processing, etc.). Therefore, the material grade table TBL2
By using, from the rank of the internal characteristic item,
It is possible to obtain a rank of material quality closely related to manufacturing conditions.

FIG. 5 shows a part of the contents of the manufacturing condition table TBL3. FIG. 5 shows only tables relating to segregation among the types of material grades. In addition, similar tables are prepared for MnS and inclusions. Referring to FIG. 5, in this example, the segregation ranks 10, 20, and
For each of 30, 40, 50, 60 and 70,
Manufacturing conditions (in this example, the contents of the casting method and the slab processing) are registered. Therefore, by using the manufacturing condition table TBL3, the manufacturing conditions can be determined from the rank of the material quality.

That is, in the quality design processing 20 shown in FIG. 2, first, the contents of the use (for example, bridge) included in the order details 10 are set as parameters and the internal characteristic table TBL is used.
1 and the rank (A, B,
C, D), and then using the rank of each item of the internal characteristics obtained from the table TBL1 as a parameter, referring to the material grade table TBL2, and a numerical value (10) indicating the material grade.
To 70), and using the value of the material quality obtained from the table TBL2 as a parameter, the manufacturing condition table TBL
3, the information on the manufacturing conditions (contents of the casting method and the slab processing) is acquired.

A specific example will be described. For example, when the usage is “bridge”, “B” is obtained as the internal characteristic rank of the base material UT characteristic by referring to the internal characteristic table TBL1. Therefore, first, material segregation table TB
Referring to L2, since the rank of the base material UT is B, 70 is obtained as the value of the material quality. Next, referring to the manufacturing condition table TBL3, the manufacturing conditions relating to segregation are determined to be C3 for the casting method and A for the slab treatment since the material quality is 70. Other items of material grade (MnS, inclusions)
Is similarly processed.

Similarly, when the usage is "hydraulic iron pipe", referring to the internal characteristic table TBL1, "C" is the internal characteristic rank of the base metal UT characteristic, and "B" is the internal characteristic rank of the MT / PT characteristic. Is obtained. Therefore, first, referring to the material quality table TBL2 for segregation, the base material U
While 70 is obtained for the rank C of the T characteristic and 60 is obtained for the rank B of the MT / PT characteristic, the stricter rank 60 of the two is selected as the value of the material quality.
Next, referring to the manufacturing condition table TBL3, the manufacturing conditions relating to segregation are as follows.
2. The slab process is determined as A. Other items of material quality are processed in the same manner.

If a new use appears, the item is added to the use item of the internal characteristic table TBL1.
Simply ranking each internal characteristic item can also respond to the order details of the new use.

[0021]

As described above, according to the present invention, as the internal characteristics of the first conversion table means (TBL1), those having strong characteristics as evaluation indices of use performance are adopted. It has a strong correlation with usage. Further, the material quality in the second conversion table means (TBL2) has a great correlation with the use performance of the steel sheet, and at the same time has a great correlation with the contents of the manufacturing conditions in the third conversion table means (TBL3). Have. That is, the use and the internal characteristics, the internal characteristics and the material quality, and the material quality and the manufacturing conditions can be associated with each other, so that the first, second and third conversion table means can be used. If this is the case, the contents of the manufacturing conditions can be systematically derived from the usage through the internal characteristics and the material quality. Further, in this way, for example, when a new use appears, it can be dealt with only by adding the information of the use to the first conversion table means, and the use has a strong correlation with the internal characteristics. Information to be added can be easily determined.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an entire quality design system according to an embodiment.

FIG. 2 is a block diagram illustrating a configuration of an apparatus that generates manufacturing conditions for a new steel type that has no track record.

FIG. 3 is a memory map showing the contents of a part of an internal characteristic table.

FIG. 4 is a memory map showing a part of a material quality table.

FIG. 5 is a memory map showing the contents of a part of a manufacturing condition table.

FIG. 6 is a memory map showing an example of order details information.

[Explanation of symbols]

10: Order receipt (input means) 20: Quality design processing (quality design means) WS1, WS2: Work station TBL1: Internal characteristic table (first conversion table means) TBL2: Material quality table Table (second conversion table means) TBL3: Manufacturing condition table (third conversion table means)

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Nobuyuki Komatsu 1 Kimitsu, Kimitsu-shi Nippon Steel Corporation Kimitsu Works (72) Inventor Masahiro Yamashita 1 Kimitsu, Kimitsu-shi Nippon Steel Corporation (72) Inventor Yuji Watanabe 1 Kimitsu, Kimitsu City Nippon Steel Corporation Kimitsu Works (72) Inventor Takashi Suyama 1 Kimitsu, Kimitsu City Nippon Steel Corporation Kimitsu Inside steelworks (72) Inventor Shinichi Shimomura 1 Kimitsu, Kimitsu-shi Nippon Steel Corporation Kimitsu Works (56) References JP-A-2-156017 (JP, A) JP-A-2-183334 ( JP, A) JP-A-2-183335 (JP, A)

Claims (1)

(57) [Claims] 1. An input means for inputting information of an order detail including a use of a steel sheet; required characteristics including base material UT characteristics, MT / PT characteristics, lame resistance and bendability are arbitrarily determined according to their strictness. A first conversion table means for registering the rank of the required property, that is, the rank of the internal property corresponding to the use for each use of the steel sheet; A second conversion table means for pre-dividing an arbitrary number according to the severity and registering the rank of the material grade capable of satisfying the required characteristics for each rank of the internal characteristics; Third conversion table means in which the manufacturing conditions of the steel sheet including the casting method and the slab treatment method for satisfying the quality are classified in advance for each rank of each material quality and registered, and registered. Fill in Wherein the rank of the internal characteristics corresponding to uses of order item input by means first
The material quality corresponding to the determined rank of the internal characteristics is determined from the second conversion table means, and the steel sheet manufacturing condition corresponding to the determined material quality is determined by the third conversion table means. A steel sheet quality design device comprising: a quality design means required from a table means.