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Wire rod having enhanced strength and impact toughness and preparation method for same

A technology of impact toughness and manufacturing methods, applied in the direction of manufacturing tools, metal rolling, furnace types, etc., to achieve the effects of omitting heat treatment process, excellent strength and impact toughness, and reducing overall manufacturing costs

Inactive Publication Date: 2017-08-18
POHANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there has not been developed a wire rod that can stably obtain bainite or martensite structure only by hot rolling and continuous cooling process without additional heat treatment process, so there is a rising demand for the development of such wire rod

Method used

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  • Wire rod having enhanced strength and impact toughness and preparation method for same
  • Wire rod having enhanced strength and impact toughness and preparation method for same
  • Wire rod having enhanced strength and impact toughness and preparation method for same

Examples

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Embodiment Construction

[0075] Next, embodiments of the present invention will be described in detail. The following examples are only for understanding the present invention, and the present invention is not limited by the examples.

[0076] (Example)

[0077] Cast molten steel having the composition shown in Table 1 below, then reheat at 1100°C, then roll the wire rod to a diameter of 15 mm, cool it to 300°C below the Bf temperature at the cooling rate shown in Table 2, and then air-cool it to manufacture wire. In addition, Bf, which is the bainite transformation termination temperature, is measured with a dilatometer, and the range is 300 to 350° C. depending on the chemical composition.

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Abstract

The present invention relates to a wire rod having enhanced strength and impact toughness and a preparation method for same, the wire rod which can be used for components of an industrial machine, vehicle and the like that are exposed to various environments of external loads.

Description

technical field [0001] The present invention relates to a wire rod excellent in strength and impact toughness that can be used for parts of industrial machinery and automobiles exposed to various external load environments, and a manufacturing method thereof. Background technique [0002] At present, efforts to reduce the emission of carbon dioxide, which is designated as a major culprit of environmental pollution, are becoming a worldwide topic. As part of this, activities to limit vehicle exhaust emissions are active, and as a countermeasure, automakers want to solve this problem by improving fuel efficiency. However, in order to improve fuel efficiency, it is necessary to reduce the weight and improve the performance of vehicles, so the need for high strength of materials and components for vehicles is increasing. Moreover, the stability requirements for external impacts are also increasing, so impact toughness is also considered as an important physical property of mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/14C22C38/32C22C38/38C22C38/28C22C38/02C22C38/06C21D8/06
CPCC21D8/06C22C38/02C22C38/04C22C38/06C22C38/14C22C38/28C22C38/32C22C38/38C21D2211/008C21D2211/005C21D2211/002C21D8/065C21D9/525C22C38/001C22C38/002B21B1/22B21B2001/225
Inventor 李炯直柳根水
Owner POHANG IRON & STEEL CO LTD
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