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Wire rod, steel wire and their manufacturing method

A manufacturing method and wire rod technology, applied in the field of steel wire, can solve the problems of increased production cost and huge investment in equipment, etc.

Active Publication Date: 2011-12-28
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to perform predetermined processing in such a temperature range, a huge investment in equipment is required, which may lead to an increase in production costs.

Method used

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  • Wire rod, steel wire and their manufacturing method
  • Wire rod, steel wire and their manufacturing method
  • Wire rod, steel wire and their manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0065] (Composition of the wire)

[0066] The first embodiment of the present invention relates to a wire rod in which an area of ​​0.5% or less of the center region of a cross section perpendicular to the longitudinal direction of the wire rod and an area of ​​0.5% or less of the surface region (first surface layer region) of the cross section are initially divided. Occupied by analysis of cementite structure.

[0067] According to the research of the present inventors, the ratio of proeutectoid cementite in the surface region of the wire rod and the central region of the wire rod before wire drawing is related to the ductility of the steel wire after wire drawing. If the area ratio of cementite in the surface layer region of the wire rod can be suppressed to 0.5 % or less, the ductility of the steel wire obtained by wire drawing is improved, and by suppressing the area ratio of cementite in the central region of the wire rod to 0.5% or less, wire breakage during drawing can ...

no. 2 Embodiment approach

[0126] (composition of steel wire)

[0127] A second embodiment of the present invention is a steel wire obtained by drawing the wire rod described in the first embodiment, having a diameter of 0.1 to 0.4 mm and a tensile strength of 4200 MPa or more. Proeutectoid cementite occupies 0.5% or less of the surface region (second surface region) of the cross section of the steel wire perpendicular to the longitudinal direction of the steel wire.

[0128] Here, the second surface layer region refers to the region from the surface layer of the steel wire to 10 μm.

[0129] (Manufacturing conditions of steel wire)

[0130] Such a steel wire can be obtained by drawing the wire rod described in the first embodiment, heating it to 900°C or higher, and introducing the heated wire rod into a lead bath or a fluidized bed at 500-600°C at least once. The steel wire that starts to cool in the middle is toughened, and then cold drawn.

no. 3 Embodiment approach

[0132] (composition of steel wire)

[0133] A third embodiment of the present invention is a steel wire having a diameter of 0.8 to 8 mm and a tensile strength of 1800 MPa or higher obtained by drawing the wire rod described in the first embodiment having a diameter of 5 to 16 mm. The area of ​​0.5% or less of the surface region (third surface region) of the cross section of the steel wire perpendicular to the longitudinal direction of the steel wire is occupied by proeutectoid cementite.

[0134] Here, the third surface layer region refers to the region from the surface layer of the steel wire to 20 μm.

[0135] (Manufacturing conditions of steel wire)

[0136] Such a steel wire can be obtained by cold drawing the wire rod described in the first embodiment.

[0137] The steel wire obtained in this way can be used directly after drawing, but it can also be processed as follows: (1) after drawing, implement bluing treatment, hot drawing, hot-dip galvanizing or hot-dip galvani...

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Abstract

The present invention relates to a wire material comprising 0.95 to 1.30 mass% of C, 0.1 to 1.5 mass% of Si, 0.1 to 1.0 mass% of Mn, 0 to 0.1 mass% of Al, 0 to 0.1 mass% of Ti, 0 to 0.02 mass% of P, 0 to 0.02 mass% of S, 10 to 50 ppm of N, 10 to 40 ppm of O, and the remainder containing at least Fe and unavoidable impurities, wherein 97% or more of the area of a cross-sectional surface perpendicular to the length-wise direction of the wire material is occupied by a pearlite structure, and wherein both a 0.5% or less of the area of the center region of the cross-sectional surface and 0.5% or less of the area of a first surface layer region of the cross-sectional surface are occupied by a pro-eitectoid cementite structure.

Description

technical field [0001] The present invention relates to wire rods, steel wires and methods for their manufacture. More specifically, the present invention relates to applications such as steel cords, sawing wires, etc. suitable for use as reinforcing materials for radial tires for automobiles, various industrial belts and hoses, and PC steel wires , galvanized twisted steel wires, steel wires for springs, steel wire ropes for suspension bridges, etc., rolling wire rods and their manufacturing methods, and steel wires based on the above-mentioned rolled wire rods. [0002] This application claims priority based on Japanese Patent Application Japanese Patent Application No. 2010-020185 filed on February 1, 2010, and the content thereof is incorporated herein. Background technique [0003] Steel wires used as reinforcing materials for radial tires of automobiles, various belts, hoses, etc. or steel wires used for saw wires are generally manufactured as follows: The cooled wir...

Claims

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Application Information

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IPC IPC(8): C22C38/00C21D8/06C21D9/52C22C38/54
CPCC22C38/04C21D8/065C21D2211/002C21D1/48C22C38/001C21D9/525C21D8/06C22C38/02C21D2211/009C22C38/002C22C38/005
Inventor 山崎真吾真锅敏之平上大辅室贺也康
Owner NIPPON STEEL CORP
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