High-strength steel wire material exhibiting excellent cold-drawing properties, and high-strength steel wire

A high-strength steel wire, high-strength technology, applied in the direction of metal material coating process, coating, furnace type, etc., can solve the problem of low wire drawing processability, and achieve the effect of excellent raw drawing.

Inactive Publication Date: 2015-11-11
KOBE STEEL LTD
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Problems solved by technology

However, the wire drawability of the steel obtained by this technique is low, about 50% in terms of area reduction, and the strength level of the wire is also about 1350-1500MPa

Method used

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  • High-strength steel wire material exhibiting excellent cold-drawing properties, and high-strength steel wire
  • High-strength steel wire material exhibiting excellent cold-drawing properties, and high-strength steel wire
  • High-strength steel wire material exhibiting excellent cold-drawing properties, and high-strength steel wire

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Embodiment Construction

[0028] In order to solve the above-mentioned problems, the inventors of the present invention studied the relationship between the structure of the wire rod and the wire drawability. In particular, the precipitation mechanism of proeutectoid cementite in hypereutectoid steel has also been studied. As a result, it was found that precipitation of pro-eutectoid cementite can be suppressed by precipitating fine TiC in the vicinity of grain boundaries. The effect is greatest for fine TiC having a size of 0.1 μm or less, and it is necessary to ensure a sufficient amount of precipitation of fine TiC. The higher the C content of the steel, the easier it is to precipitate cementite, so more fine TiC is needed. Since it is difficult for coarse TiC to exhibit such an effect, it is necessary to precipitate as much fine TiC as possible. It is extremely important to properly control the precipitation amount and size distribution of TiC.

[0029] Precipitating fine TiC having a size of 0....

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Abstract

Provided are: a high-strength steel wire material which exhibits excellent cold-drawing properties and a high prescribed strength; a high-strength steel wire produced from this high-strength steel wire material; and a zinc-plated high-strength steel wire. This high-strength steel wire material is characterized by respectively including 0.80-1.3% of C, 0.1-1.5% of Si, 0.1-1.5% of Mn, more than 0% but not more than 0.03% of P, more than 0% but not more than 0.03% of S, 0.02-0.2% of Ti, 0.01-0.10% of Al, and 0.001-0.006% of N, the remainder comprising iron and unavoidable impurities. The high-strength steel wire material is further characterized in that the relationship in formula (1), namely 0.05% ≥ [Ti*] ≥ (0.0023× [C]) (with the caveat that [Ti*] = (the total amount of Ti - the total amount of Ti in compounds having a size of at least 0.1 µm), and [C] represents the carbon content (in mass%)), is satisfied.

Description

technical field [0001] The present invention relates to high-strength steel wires useful as raw materials for galvanized steel wires such as steel cables for bridges, and wire rods for high-strength steel wires used to obtain such high-strength steel wires. In particular, it relates to not performing heat treatment after rolling, On the other hand, wire rods for high-strength steel wires with good processability during wire drawing, etc. Background technique [0002] For steel cables used in bridges, etc., hot-dip galvanized steel wires or steel strands are used to improve corrosion resistance. As a raw material of such a steel wire, for example, JISG3548 shows a steel wire having a wire diameter of 5 mm and a tensile strength TS of about 1500 to 1700 MPa, and as the raw material steel, carbon steel described in JISG3506 is mainly used. [0003] However, in addition to the reduction of manufacturing costs, the development of steel wires that are raw materials for hot-dip ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C22C38/14C22C38/54C21D8/06C21D9/52
CPCC22C38/00C21D8/06C21D8/065C21D9/52C21D2211/004C22C38/04C22C38/14C22C38/54C23C2/06C23C2/38C22C38/001C22C38/002C22C38/02C22C38/06C22C38/08C22C38/12C22C38/16C22C38/24C22C38/26C22C38/28C22C38/30C22C38/32
Inventor 石田友信吉原直
Owner KOBE STEEL LTD
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