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Wire rod excellent in wire-drawing workability and method for producing same

A manufacturing method and technology for wire rods, which are applied in manufacturing tools, temperature control, heat treatment process control, etc., can solve problems such as ductility deterioration of wire drawing products and reduction of mold life.

Inactive Publication Date: 2007-12-12
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, as summarized in Chapter 6 of Non-Patent Document 1, an increase in the wire drawing speed and an increase in the area reduction rate per pass will lead to deterioration of the ductility of the wire drawing product and a reduction in the life of the die.

Method used

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  • Wire rod excellent in wire-drawing workability and method for producing same
  • Wire rod excellent in wire-drawing workability and method for producing same

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Embodiment Construction

[0021] The wire rod of the present invention has characteristics in its compositional requirements and structural requirements (the area ratio of the second phase ferrite and the interlamellar spacing of pearlite). Therefore, first, the components of the wire rod (steel material) will be described.

[0022] C: 0.6 to 1.1% (mass % means the same below)

[0023] C is an element that affects the strength of the wire rod, and it is necessary to add 0.6% or more in order to ensure the necessary strength of the steel cords, tire steel wires, PC steel wires, etc. that are the object of the present invention. On the other hand, if the amount of C is too large, the ductility will deteriorate, so the upper limit is made 1.1%. The amount of C is preferably not less than 0.8% and not more than 1.0%.

[0024] Si: 0.1 to 2.0%

[0025] In wire rods that are highly wire-drawn, Si is added especially for the purpose of deoxidation, and it is necessary to add 0.1% or more. In addition, Si a...

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PUM

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Abstract

Disclosed are a wire rod and a method therefor. The wire rod is excellent in wire-drawing workability, insusceptible to wire break in spite of an increase in wire-drawing rate, and reduction of area, and capable of extending a die life by suppressing die wear. The wire rod is made of steel containing C: 0.6 to 1.1%, Si: 0.1 to 2.0%, Mn: 0.1 to 1%, P: not more than 0.20%, S: not more than 0.20%, N: not more than 0.006%, Al: not more than 0.03%, and O: not more than 0.003%, the balance including Fe, and unavoidable impurities. Further, the wire rod comprises a pearlite structure wherein an area ratio of a second-phase ferrite is not more than 11.0%, and a pearlite lamellar spacing is not less than 120 mum.

Description

technical field [0001] The present invention relates to a wire rod excellent in wire-drawability capable of efficiently producing wire-drawn products such as steel cords, tire wires, PC steel wires, and spring steels with high productivity, and a manufacturing method thereof. Background technique [0002] In most cases of manufacturing wire-drawn products such as steel cords, the wire rod as the raw material is subjected to wire-drawing for dimensional adjustment and material (physical property) adjustment, so improving the wire-drawability of the wire rod is extremely important in improving productivity, etc. beneficial. That is, if the wire drawing workability is improved, not only the productivity can be improved due to the increase of the wire drawing speed and the reduction of the number of wire drawing passes, but also many benefits such as reduction of die wear can be enjoyed. [0003] Therefore, in this technical field, researches to improve the wire-drawability of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C38/18C22C38/16C22C38/40C22C38/20C22C38/22C22C38/26C22C38/28C22C38/42C22C38/44C22C38/48C22C38/50C22C38/54B21B37/74B21C47/02C21D8/06C21D11/00
CPCC22C38/06C22C38/02C22C38/04C21D8/065C22C38/001C21D2211/009
Inventor 高知琢哉黑田武司酒井英典丸尾知忠村上昌吾家口浩
Owner KOBE STEEL LTD
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