Boots – shoes – and leggings
Patent
1993-02-03
1994-10-18
Gordon, Paul
Boots, shoes, and leggings
148541, 164 41, 164418, G06F 1546, B22D 1116
Patent
active
053574435
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of estimating the properties of a steel product which enables the structure and properties of the steel product to be estimated without conducting a breaking test during or after the production of the steel product.
BACKGROUND ART
For example, users of steel plates etc. often demand of the manufacturer the attachment of the results of a material test concurrently with the delivery of the product. In response to this demand, the manufacturer has hitherto cut out a part of the product and conducted a test of the physical properties (tensile strength, toughness, etc.) of the extracted sample.
In some cases, the properties of the steel product have been estimated based on production conditions such as steel ingredients and rolling termination temperature. Since, however, this is usually done using a regression method and does not take metallurgical phenomenon into consideration, the scope of application is limited and disadvantageously this method cannot be applied to different production processes or steel plate thicknesses.
The above-described artificial measurement of properties requires a lot of time, which influences the shipment and delivery of the product. Further, at the present time, the properties thereof can be discerned only in a finished product, and the development of a technique that enables the properties of the steel product to be estimated before production thereof and, at the same time, provides production conditions capable of providing a high quality goods consistently, is required in the art.
Accordingly, an object of the present invention is to provide a method of estimating the properties of a steel product that enables the properties of the steel product to be automatically assessed based on given production conditions.
DISCLOSURE OF THE INVENTION
In the present invention, in order to attain the above-described object, a computation for metallurgical phenomena is computed based on information concerning steel ingredients and production conditions during the casting to heat treatment steps to successively determine the state of a metallic structure, and the properties of a steel product is estimated from the final state of the metallic structure.
Specifically, the method of estimating the properties of a steel product according to the present invention comprises the steps of: computing the temperature of a slab based on casting conditions and completing a computation for the state of the metallic structure after casting based on information concerning the temperature of the slab and the steel ingredients; completing a computation for the state of the metallic structure after rolling based on the state of the metallic structure before rolling and the temperature of the steel product computed from rolling conditions; completing a computation for the state of the metallic structure after cooling based on the state of the metallic structure before cooling and the temperature of the steel product computed from cooling conditions; and completing a computation for the quality of the steel product based on the final state of the metallic structure.
In order to cope with the provision of additional production steps such as reheating, a homogeneous diffusion heat treatment, preliminary rolling, quenching, tempering and normalizing, etc., the method may further comprise the step of completing a computation for the state of the metallic structure following the additional steps based on the state of the metallic structure before the additional steps and the conditions of the additional steps.
Further, instead of completing a computation for the state of the metallic structure after casting, the state of the metallic structure after casting may be assumed and taken as an initial state.
According to the above-described means, the input of actual results of the production of a steel product or conditions set before the production of the steel product followed by a computation enables a fraction of a phase constituting the structure as the
REFERENCES:
patent: 4840051 (1989-06-01), Boratto et al.
ISIJ International, vol. 32, No. 3, (1992) Atsuhiko Yoshie et al., "Modelling of Microstructural Evolution and Mechanical Properties of Steel Plates Produced by Thermo-Mechanical Control Process", pp. 395-404.
Sumitomo Metal, vol. 42, No. 4, (1990) Nozomu Komatsubara and others "Quality Estimation Control Technology for Plank Hot-rolled Steel Plate", pp. 104-112.
Iron and Steel, vol. 75, No. 6, (1989) Satoshi Akamatsu and others "Development of NbC Deposition Model during Hot Working of Austenite Region in Low-carbon Nb Steel", pp. 933-940.
Proc. Int. Conf. on Physical Metsllurgy of Thermo-mechanical Processing of Steels and other Metals, (1988) ed by I. Tamura, ISIJ. Tokyo, A. Yoshie et al.
"Estimation Model for Evolution of Microstructure and Mechanical Properties of Nb Bearing Steel Plates Produced by Thermo-Mechanical Control Process", pp. 799-806 No date.
Iron and Steel, vol. 70, No. 15, (1984) Takehide Senuma and others "Changes in Carbon-steel Austenite Texture during High-speed Continuous Hot Working", pp. 2112-2119.
Akamatsu Satoshi
Fujioka Masaaki
Fujita Takashi
Nishioka Kiyoshi
Shimomura Shinichi
Gordon Paul
Nippon Steel Corporation
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