Method and device for manufacturing martensite-containing steel sheet
A manufacturing method and a technology for manufacturing devices, which are applied in the field of manufacturing and devices of martensite-containing steel plates, can solve the problems of large heat treatment equipment and slow cooling speed, and achieve the minimization of equipment cost, reduction of thermal stress, and reduction of equipment size Effect
Inactive Publication Date: 2018-08-21
POHANG IRON & STEEL CO LTD
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Problems solved by technology
[0013] However, there are limitations in obtaining good flatness by quenching (rapid cooling) of high-temperature steel sheets with existing technologies
[0014] In addition, there are batch-type and continuous-type processes for heat treatment of steel plates, each of which has the following characteristics. The batch type heats and cools the steel plate in the coiled state, the cooling rate is slow, and the steel plate is heated while moving. and cooling continuous type heat treatment equipment larger
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[0029] best practice
[0030] The present invention provides a method and apparatus for manufacturing a martensite-containing steel sheet, which not only have efficiency in terms of equipment investment and operation, but also disperse and minimize the concentration of thermal stress in the longitudinal direction of the steel sheet when rapidly cooling the steel sheet , so that the degree of deformation of the strip shape is minimized.
[0031] In order to produce a steel sheet containing martensite according to a preferred aspect of the present invention, it is necessary to prepare a steel sheet in the form of a coil in which at least a part of the austenite is transformed into martensite during water cooling.
[0032] The steel sheet is not particularly limited as long as at least a part of the fine structure turns into austenite when heated, and at least a part of the austenite turns into martensite when water-cooled.
[0033] The steel plate preferably applicable to the p...
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The present invention relates to a method and a device for manufacturing a martensite-containing steel sheet, the method comprising the steps of: preparing, in a coil shape, a steel sheet in which atleast one part of austenite is transformed into martensite during water cooling; heating the steel sheet coil such that at least one part of the microstructure of the steel sheet becomes austenite; and unwinding the heated steel sheet coil, and water-cooling the steel sheet at a cooling speed of 500 DEG C / sec or more while transferring the steel sheet at a transferring speed of 300 mpm or more, soas to transform the at least one part of austenite into the martensite.
Description
technical field [0001] The present invention relates to a method and an apparatus for manufacturing a martensite-containing steel sheet used for automobile structural steel, and more specifically, to a method and apparatus for manufacturing a martensite-containing steel sheet by performing intermittent heating and continuous cooling. Background technique [0002] Demand for high-strength automotive structural steels is increasing in order to meet high fuel consumption rates through lightweighting and stringent safety regulations. [0003] In general, alloying elements such as non-ferrous metals and rare earths are added to produce high-strength steel. [0004] However, the addition of alloying elements has problems such as increased manufacturing costs, poor manufacturing efficiency, and product processability (eg, weldability). [0005] Therefore, attempts are being made to increase the strength of steel by minimizing alloy components and performing rapid cooling in the he...
Claims
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IPC IPC(8): C21D9/46C21D9/54C21D9/68C21D11/00C21D8/02C22C38/02C22C38/04
CPCC21D9/46C21D9/54C22C38/02C22C38/04C21D1/185C21D2211/008C21D1/60C21D1/18C21D8/0205C21D8/0247C21D9/0043C21D9/68C21D1/63C21D1/74
Inventor 韩仁硕
Owner POHANG IRON & STEEL CO LTD