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Medium carbon wire rod excellent in strength and cold workability and manufacturing method thereof

A technology of cold workability and manufacturing method, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve problems such as difficulty in ensuring strength, poor cold forgeability, insufficient C content, etc., and achieve the effect of suppressing deformation resistance and excellent cold workability

Active Publication Date: 2020-08-11
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In addition, Patent Document 1 relates to a method of manufacturing a non-tempered bolt that contains 0.15% to 0.30% of carbon (C) and is drawn at a reduction in area of ​​20% to 50%. In this case, the spheroidizing heat treatment can be omitted. etc. However, due to insufficient C content, it is difficult to secure sufficient strength
[0010] In addition, Patent Document 2 discloses a steel for cold forging containing 0.4% to 1.0% of carbon (C) and having a microstructure consisting of pearlite or pseudo-pearlite. Compared with carbon steel or alloy steel for mechanical structure of mechanical parts such as bolts, cold forgeability is poor

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  • Medium carbon wire rod excellent in strength and cold workability and manufacturing method thereof
  • Medium carbon wire rod excellent in strength and cold workability and manufacturing method thereof
  • Medium carbon wire rod excellent in strength and cold workability and manufacturing method thereof

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Embodiment Construction

[0025] The inventors of the present invention conducted intensive studies in order to provide a wire rod having target levels of strength and hardness after drawing and ensuring excellent cold workability. As a result, it was found that by optimizing the alloy composition and manufacturing conditions of a medium-carbon wire rod containing a certain amount of carbon, it is possible to form a microstructure that is favorable for suppressing deformation resistance during cold working, thereby providing a solution that does not change cold workability after drawing. Poor high-strength medium carbon wire rod, thus completing the present invention.

[0026] The present invention will be described in detail below.

[0027] According to one aspect of the present invention, the medium carbon wire rod excellent in strength and cold workability preferably contains C: 0.30% to 0.45%, Si: 0.005% to 0.4%, Mn: 0.8% to 1.8%, Cr: Less than or equal to 1.5% (except 0%), P: less than or equal t...

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Abstract

The invention relates to a medium-carbon wire rod having excellent strength and cold forging characteristics and a method for manufacturing same. The invention relates to the medium-carbon wire rod suitable for being used as a mechanical element material, and the method for manufacturing same.

Description

technical field [0001] The invention relates to a medium carbon wire suitable for use as a material for mechanical parts. In more detail, the present invention relates to a medium carbon wire excellent in strength and cold workability and a method for manufacturing the same. Background technique [0002] The cold working method is widely used in the manufacture of mechanical parts such as bolts and nuts due to its superior productivity and greater heat treatment cost savings compared to hot working or mechanical cutting. [0003] However, in order to manufacture machine parts using the cold working method, steel materials are basically required to have excellent cold workability, and more specifically, low deformation resistance during cold working and excellent ductility are required. This is because if the deformation resistance of the steel is high, the life of the tool used during cold working will be shortened, and if the ductility of the steel is low, splitting will e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/38C22C38/06C22C38/28C22C38/32C21D8/06
CPCC21D8/065C22C38/001C22C38/02C22C38/04C22C38/06C22C38/28C22C38/32C22C38/38C21D9/06C21D2211/005C21D2211/009
Inventor 文东俊金哈尼柳根水闵世泓
Owner 浦项股份有限公司