High Carbon steel wire material having excellent wire drawability and manufacturing process thereof

Inactive Publication Date: 2006-06-22
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016] According to the present invention, a high carbon steel wire material which has excellent wire drawability and can enhance productivity due to increases in wire drawing rate and area reduction rate and can extend the service life of a die and a process capable of manufacturing the high carbon steel wire material having excellent wire drawability surely and efficiently can be provided by specifyi

Problems solved by technology

If scale remains on the surface of a steel wire material due to poor descalability, it causes the chipping of the die at the time of wire drawing.
However, the above prior arts place main emphasis on the improvement of wire breakage resistance under specific wire drawing conditions and rarely pay attention to the improvement of wire drawing rate, the reduction of the number of passes for wire drawing and the extension of the service life of a die

Method used

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  • High Carbon steel wire material having excellent wire drawability and manufacturing process thereof
  • High Carbon steel wire material having excellent wire drawability and manufacturing process thereof
  • High Carbon steel wire material having excellent wire drawability and manufacturing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Example

Experimental Example 1

[0071] A hot rolled steel wire material having a diameter of 5.5 mm having chemical composition shown in Table 1 was manufactured. The amount of REM in Table 1 shows the total amount of La, Ce, Pr and Nd. The obtained hot rolled steel wire material was heated in an atmospheric furnace under conditions shown in FIG. 1 and Tables 2 and 3 and charged continuously into a lead furnace to be heated so as to obtain various steel wire materials. In this experimental example, the atmospheric furnace and the lead furnace were used to carry out the above heat treatment. The present invention is not limited to the use of these devices and other heating furnaces and holding furnaces may be used as a matter of course.

[0072] The structural features, scale characteristics and tensile characteristics of the obtained steel wire materials were evaluated. As for the crystal units of bcc crystal grains and sub grains out of the structural features, as the evaluation of variations...

Example

Experimental Example 2

[0093] To improve wire drawability as hot rolled, types of steel shown in Table 5 below were used and studied. The amount of REM in Table 5 shows the total amount of La, Ce, Pr and Nd. All the types of steel shown in Table 5 satisfy the requirements for composition specified by the present invention.

[0094] The types of steel shown in Table 5 were hot rolled under conditions shown in Table 6 and FIG. 5. In the case of a hot rolled material, all the steps from a heating furnace to rolling and cooling must be controlled. As shown in FIG. 5, the control items are more complicated than in the above Experimental Example 1 (FIG. 1). The structural features, scale characteristics, tensile characteristics and wire drawability of the obtained hot rolled materials were evaluated in the same manner as in the above Experimental Example 1.

[0095] The results are shown in Tables 6 to 8 and FIG. 6. By suitably controlling a series of steps from heating to winding and cooling...

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Abstract

A high carbon steel wire material which is made of high carbon steel as a raw material for wire products such as steel cords, bead wires, PC steel wires and spring steel, allows for these wire products to be manufactured efficiently at a high wire drawing rate and has excellent wire drawability and a manufacturing process thereof.
This high carbon steel wire material is made of a steel material having specific contents of C, Si, Mn, P, S, N, Al and O, and the Bcc-Fe crystal grains of its metal structure have an average crystal grain diameter (Dave) of 20 μm or less and a maximum crystal grain diameter (Dmax) of 120 μm or less, preferably an area ratio of crystal grains having a diameter of 80 μm or more of 40% or less, an average sub grain diameter (dave) of 10 μm or less, a maximum sub grain diameter (dmax) of 50 μm or less and a (Dave/dave) ratio of the average crystal grain diameter (Dave) to the average sub grain diameter (dave) of 4.5 or less.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a carbon steel wire material which is made of high carbon steel as a raw material for wire products such as steel cords, bead wires, PC steel wires and spring steel, allows for these wire products to be manufactured efficiently at a high wire drawing rate and has excellent wire drawability. [0003] 2. Description of Related Art [0004] To manufacture the above wire products, wire drawing is carried out on a steel wire material as a raw material for the control of size and material (mechanical properties) in most cases. Therefore, the improvement of the wire drawability of a steel wire material is extremely useful for the enhancement of productivity and the like. When wire drawability is improved, many advantages such as the improvement of productivity by an increase in wire drawing rate and a reduction in the number of passes for wire drawing and also the extension of the service life ...

Claims

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Application Information

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IPC IPC(8): C21D9/52
CPCC21D8/06C21D9/525C22C38/02C22C38/04
Inventor MINAMIDA, TAKAAKIKURODA, TAKESHIKOCHI, TAKUYAYAGUCHI, HIROSHI
Owner KOBE STEEL LTD
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