Material heating method

a heating method and material technology, applied in the field of material heating methods, can solve the problems of scale defects which are not removed, car makers and companies dealing with various electronic products have delicate surface requirements, etc., and achieve the effect of improving the surface quality of materials

Inactive Publication Date: 2014-03-06
HYUNDAE STEEL CO LTD
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  • Abstract
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Benefits of technology

[0016]In accordance with the embodiment of the invention, the material heating method may significantly improve the surface quality of the material through control of the heating process. In particular, the material heating method may remove red scale of a material containing carbon of 0.15 to 1.2 wt % and silicon of 0.1 wt % or more.

Problems solved by technology

In the case of an external plate for vehicles and a plate for domestic products, a surface quality serves as an important control factor, and a scale defect is considered as a serious problem of hot-rolled steel.
Recently, car makers and companies to deal with various electronic products have delicate requirements for the surface quality of hot-rolled steel.
However, there exist scale defects which are not removed by the descaler.

Method used

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Embodiment Construction

[0022]Embodiments of the invention will hereinafter be described in detail with reference to the accompanying drawings. It should be noted that the drawings are not to precise scale and may be exaggerated in thickness of lines or sizes of components for descriptive convenience and clarity only. Furthermore, the terms as used herein are defined by taking functions of the invention into account and can be changed according to the custom or intention of users or operators. Therefore, definition of the terms should be made according to the overall disclosures set forth herein.

[0023]FIG. 1 is diagram illustrating the temperature profile of a material and the temperature of a heating furnace in accordance with an embodiment of the present invention. FIG. 2 is a cross-sectional view of the heating furnace in accordance with the embodiment of the present invention. FIG. 3 is a perspective view of a rolling apparatus in accordance with the embodiment of the present invention. FIG. 4 is a cro...

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Abstract

A material heating method includes: a step of charging a silicon-containing carbon steel material into a heating furnace; a step of preheating the material; a first heating step of raising the temperature of the material; a second heating step of lowering the temperature of the material so as to reduce a temperature difference between the surface and inside of the material; a third heating step of raising the temperature of the material; and a soaking step of reducing the temperature difference between the surface and inside of the material. The temperature of the material in the heating furnace is maintained at the melting point of fayalite or lower.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]The present application is a continuation of PCT / KR2011 / 010012 filed on Dec. 22, 2011, which claims priority to Korean Application No. 10-2011-0051139 filed on May 30, 2011, which applications are incorporated herein by reference.TECHNICAL FIELD[0002]The present invention relates to a material heating method, and more particularly, to a material heating method which is capable of improving the surface quality of a material.BACKGROUND ART[0003]In the case of an external plate for vehicles and a plate for domestic products, a surface quality serves as an important control factor, and a scale defect is considered as a serious problem of hot-rolled steel. Recently, car makers and companies to deal with various electronic products have delicate requirements for the surface quality of hot-rolled steel.[0004]In order to improve the surface quality, a descaler is installed to remove scale on the surface of hot-rolled steel during a hot rolling pro...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C21D11/00C21D6/00
CPCC21D6/008C21D11/00C21D1/26C21D9/0056F27B9/20F27B9/36F27B9/40F27D2019/0003C21D1/34
Inventor LIM, GAP SOOPARK, YONG KOOKLEE, KWAN HYUNGLIM, JONG HYOB
Owner HYUNDAE STEEL CO LTD
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