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Wire material, steel wire, and process for production of wire material

A manufacturing method and technology of wire rods, which are applied in the manufacture of steel wires and wire rods, and in the field of wire rods, can solve problems such as increased manufacturing costs, and achieve the effects of cheap yields, good yields, and excellent wire drawing properties

Inactive Publication Date: 2014-03-26
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, large-scale equipment investment is required, which leads to an increase in manufacturing cost

Method used

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  • Wire material, steel wire, and process for production of wire material
  • Wire material, steel wire, and process for production of wire material
  • Wire material, steel wire, and process for production of wire material

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0045] (Composition of the wire)

[0046] In the first embodiment of the present invention, the area of ​​0.5% or less of the central region of the cross-section perpendicular to the longitudinal direction of the wire rod and the area of ​​0.5% or less of the surface region (first surface region) of the cross-section are covered with proeutectoid cementite Tissue-occupied filaments.

[0047] According to the research of the present inventors, the proeutectoid cementite ratio in the wire rod surface region and the wire rod center region before wire drawing is related to the ductility of the steel wire after wire drawing, when the area ratio of cementite in the wire rod surface region can be suppressed to When it is 0.5% or less, the delamination resistance of the steel wire obtained by wire drawing improves, 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 be suppressed.

[0048] Here, the su...

no. 2 Embodiment approach

[0102] (composition of steel wire)

[0103] A second embodiment of the present invention is a steel wire having a tensile strength of 1800 MPa or more obtained by cold drawing the wire rod of the first embodiment with an actual strain of 1.3 or more. Proeutectoid cementite occupies 0.5% or less of the surface area (second surface area) of the steel wire in a cross section perpendicular to the steel wire longitudinal direction.

[0104] Here, the second surface layer region refers to a region from the steel wire surface layer (edge ​​portion in cross-section) to the inside of 20 μm.

[0105] The steel wire thus obtained may also be subjected to steel bluing treatment, hot-dip galvanizing, hot-dip aluminium-zinc alloy plating, etc. as final treatments.

Embodiment

[0107] The following examples are given to further specifically illustrate the present invention, but the present invention is certainly not limited to the following examples, and certainly can be appropriately modified and implemented within the scope of the gist of the present invention, and these modes are all included in the scope of the present invention within the technical range.

[0108] Table 1 and Table 2 show the chemical components of A steel to V steel used in Examples 1 to 15 and Comparative Examples 1 to 19 of the present invention. In addition, in Tables 1 to 6, numerical values ​​or unfavorable results that do not fall within the above-mentioned prescribed ranges are underlined.

[0109] After heating the steel slabs containing the chemical compositions shown in Table 1 and Table 2, they are processed into wire rods with a diameter of 7-18 mm by hot rolling, coiled at a specified temperature, and then subjected to steel wire toughening treatment.

[0110] Aft...

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Abstract

A wire material comprising at least 0.90 to 1.30 mass% of C, 0.1 to 1.2 mass% of Si, 0.1 to 1.0 mass% of Mn, 0.1 to 0.6 mass% exclusive of Al, 0 to 0.02 mass% of P, 0 to 0.02 mass% of S, 10 to 60 ppm of N, and 10 to 40 ppm of O, with the remainder being Fe and unavoidable impurities, wherein a pearlite structure comprises 97% or more of the surface area of a cross-section surface perpendicular to the lengthwise direction of the wire material, and a pro-eutectoid cementite structure comprises 0.5% or less of the center region of the cross-section surface and also comprises 0.5% or less of a first surface layer region of the cross-section surface.

Description

technical field [0001] The invention relates to a wire rod, a steel wire and a method for manufacturing the wire rod. More specifically, the present invention relates to rolled wire rods suitable for uses such as piano wires, PC steel wires, PC stranded wires, ropes, PWS metal wires for bridges, their manufacturing methods, and steel wires obtained by drawing the rolled wire rods . [0002] this application claims priority based on Japanese Patent Application No. 2010-013278 for which it applied to Japan on January 25, 2010, and uses the content here. Background technique [0003] Steel wires used as PC steel wires, PC stranded wires, ropes, PWS metal wires for bridges, etc. are generally produced as follows: wire rods with a diameter of 5 to 16 mm that have been adjusted and cooled after hot rolling are drawn to a diameter of 2 to 8 mm. Hot-dip galvanizing is performed after wire drawing or during wire drawing as necessary, and it is formed into a wire shape by twisting o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/06C21D9/52C22C38/06C22C38/54
CPCC21D2211/009C22C38/02C21D8/06C22C38/06C22C38/04C22C38/001C21D2211/003C21D9/52C21D2211/002
Inventor 山崎真吾真锅敏之
Owner NIPPON STEEL CORP