High carbon steel wires excellent in spinnability and method for producing same

A high carbon steel wire, wire drawing technology, applied in the direction of metal rolling, etc., can solve the problem that the drawability of high carbon steel wire is not good enough, there is no mention of eliminating the drawing resistance of the wire drawing die, and it has no drawability.

Inactive Publication Date: 2006-10-04
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, the techniques of U.S. Patent 6,783,609 and Japanese Patent Application Laid-Open No. 11-302743 do not mention eliminating the drawing resistance of the drawing die and improving the drawability, and do not have sufficient flexib

Method used

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  • High carbon steel wires excellent in spinnability and method for producing same
  • High carbon steel wires excellent in spinnability and method for producing same

Examples

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Embodiment 1

[0091] Embodiments of the present invention will be described below. In Example 1, high-carbon steel wire rods were obtained by variously changing the controlled cooling conditions (especially the cooling time for cooling the wire rods from 450°C to 300°C), and then the mechanical properties, drawability and tensile properties of the wire rods were evaluated. Stretch resistance.

[0092] From among the compositions shown in Table 1 below, high carbon steel slabs of Class 3 steel were commonly used and hot rolled, followed by controlled cooling under different conditions A to G shown in Table 2, to produce diameters of 5.5mm steel wire. In blast cooling from coiling temperature to 450°C, A, B, C, E, F and G in Table 2 may be strong blast cooling and D may be weak blast cooling, as an indication of judgment.

[0093] For these steel wire rods, the area percentage (%) of pearlite, the average interlaminar gap (nm), the average strength TS obtained by a tensile test, and RA (red...

Embodiment 2

[0111] Next, the results obtained in Example 2 are shown in Table 4. In Example 2, steel wire rods with a diameter of 5.5 mm of composition 1 to 10 in Table 1 were rolled under the conditions in Table 2, and then pairs of the same steel type were subjected to different controlled cooling conditions A (Comparative Example) and E (inventive examples). The high carbon steel thus obtained was then subjected to wire drawing in the same method as in Example 1.

[0112] Then, according to the same method as in Example 1, the pearlite area percentage (%), RA (%), average strength TS obtained by tensile test, average interlayer gap (nm), and Drawability, stretch resistance, and reduction in stretch resistance. The results obtained are shown in Table 4. The reductions in tensile resistance shown in Table 4 are comparisons (differences) between the following comparative examples and the examples of the present invention under the same type of steel, except for controlled cooling after...

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Abstract

The invention relates to high-carbon steel wires comprises 0.65-1.20% of C, 0.05-1.2% of Si, 0.2-1.0% of Mn, 0-0.35% of Cr, 0-0.02% of P and S, wherein over 80% of the metallic structure comprises pearlite structure.

Description

technical field [0001] The present invention relates to a high-carbon steel wire rod having reduced tensile resistance in a drawing die when in a hot-rolled state and having excellent drawability. Background technique [0002] For wires that will be drawn into very fine wires for use in steel cords or semiconductor saw wires, high carbon steel wires with a carbon content of about 0.7 to 0.8% and a diameter of 5.0mm or more are used ( Corresponds to JIS G3502: SWRS72A, SWRS82A). If these high carbon steel wire rods were to break during the drawing operation, productivity would be significantly impaired. In order to avoid this situation, high carbon steel wire rods are required to have excellent drawability. [0003] Hitherto, in order to obtain a high-carbon steel wire rod excellent in drawability, a method in which the wire rod is cooled with water after hot rolling and then subjected to blast cooling to change the structure of the wire rod into a fine pearlite structure h...

Claims

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Application Information

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IPC IPC(8): C22C38/18C22C38/54C21D7/13B21B1/16
Inventor 长尾护
Owner KOBE STEEL LTD
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