High-strength ultra-fine steel wire and manufacturing method therefor

A high-strength, steel wire technology, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve problems such as increased carbon concentration and decreased ductility, and achieve high strength and ductility, full ductility and tensile strength.

Active Publication Date: 2011-05-18
NIPPON STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the wire drawing deformation increases, the cementite usually decomposes, and C atoms diffuse into the ferrite phase, increasing the carbon concentration in the ferrite phase.
In Non-Patent Document 1, it is described that in cold-rolled steel sheets, in the case of increasing the carbon concentration in the ferrite phase, dynamic strain aging in which dislocations in the ferrite phase are stuck by carbon occurs in a tensile test , causing a significant reduction in ductility

Method used

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  • High-strength ultra-fine steel wire and manufacturing method therefor
  • High-strength ultra-fine steel wire and manufacturing method therefor
  • High-strength ultra-fine steel wire and manufacturing method therefor

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Embodiment

[0096] Hereinafter, the implementation possibilities and effects of the present invention will be more specifically described through examples.

[0097] After the test material with the chemical composition shown in Table 1 reaches the specified wire diameter by hot rolling, lead bath quenching and wire drawing are carried out in a lead bath, and the wire diameter is made in a way that the tensile strength reaches 4500 MPa or more. 0.04-0.40mm high-strength ultra-thin steel wire with brass-plated wire drawing pearlite structure. Brass plating is carried out after pickling after final lead bath quenching.

[0098]Table 2 shows the actual deformation, manufacturing method, wire diameter, average C concentration in the center of the ferrite phase of the outermost layer of the wire, residual stress of the outermost layer of the steel wire, and tensile strength of the ultra-fine steel wire during wire drawing. and the number of twists to breakage in the torsion test. In Table 2, ...

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Abstract

Provided is a steel wire containing, by mass, 0.7-1.2% carbon, 0.05-2.0% silicon, and 0.2-2.0% manganese, with the remainder comprising iron and unavoidable impurities. Said steel wire has a pearlite structure, a mean carbon concentration by mass of at most 0.2% in the central part of an outermost ferrite layer, and a residual compressive stress in the lengthwise direction of the wire of at least 600 MPa in said outermost layer.

Description

technical field [0001] The present invention relates to a steel cord for automobile tires, a high-strength steel wire used in wire saws, and a method for producing the same. Specifically, the present invention relates to an ultra-fine steel wire with a wire diameter of 0.04 to 0.4 mm and a strength of 4500 MPa or higher, which is obtained through cold drawing and strengthening using a drawing die. [0002] This application is based on and claims priority to Japanese Patent Application No. 2009-148051 filed in Japan on June 22, 2009, and the content thereof is incorporated herein by reference. Background technique [0003] In steel cords used in automobile tires, there is an increasing demand for higher tensile strength of steel cords in view of the demand for weight reduction of tires. Similarly, the demand for higher tensile force is also increasing in wire saws used for precision cutting sapphire crystals, SiC crystals, etc. In order to meet such needs, various studies h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D8/06C21D9/52C22C38/04C22C38/58C21D7/06
CPCC21D2211/009C21D8/065C21D9/525C21D7/02C21D2211/005C22C38/02C22C38/04C22C38/12C22C38/18C22C38/24C22C38/32C22C38/40C22C38/48C22C38/58C22C38/44C22C38/46C22C38/54
Inventor 高桥淳小坂诚儿玉顺一樽井敏三铃木环辉
Owner NIPPON STEEL CORP
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