Wire rods having superior strength and ductility for drawing and method for manufacturing the same
a technology of ductility and wire rods, which is applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of poor ductility of wire rods, change in strength of wire rods, and above-mentioned processes have their limits on improving strength, so as to achieve high ductility and high strength. , the effect of high strength
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example 1
[0042]Each of steel billets having components and their contents as listed in the following Table 1 was heated at 1100 to 1300° C., and hot-rolled, and then cooled at a rate of 10 to 20° C. / s to obtain a wire rod. Then, each of the prepared wire rods was measured for tensile strength (TS), reduction of area (RA), and interlamellar spacing of a pearlite structure.
[0043]As listed in the following Table 1, it was revealed that wire rods of Comparative steels 1 to 6 have a tensile strength of 1119 to 1249 MPa, and show their 30% or less reduction of area, except for the Comparative steel 1. In the case of the Comparative steel 1, it was seen that the wire rod has a high reduction of area owing to the low C content (i.e. 0.82% by weight), but is not suitable for a high-strength steel due to the very low strength (i.e. 1119 MPa) of steel.
[0044]On the contrary, it was revealed that Inventive steels 1 to 5 have a tensile strength of 1300 MPa or more, and also show their 30% or more reductio...
example 2
[0048]Each of the wire rods (Inventive steel 1, Comparative steels 4 and 5) prepared in the method of Example 1 was austenized at 1050° C., lead-patented at a solder pot temperature of 550° C. to obtain a steel sheet. Then, each of the steel sheets was measured for tensile strength and interlamellar spacing. The results are listed in the following Table 2.
[0049]As listed in Table 2, it was revealed that a tensile strength of the Inventive steel 1 is increased by 88 MPa due to the increased Si content, compared to the Comparative steel 4. Also, it was revealed that the Inventive steel 1 has a superior tensile strength to the Comparative steel 5 whose C content is higher than that of the Inventive steel 1. And it was seen that, owing to the combined addition of Si and Cr, the Inventive steel 1 shows its superior tensile strength even after the LP process (i.e. heat treatment). In this case, it was seen that the Inventive steel 1 has an interlamellar spacing of 26 nm, which is about a ...
example 3
[0050]Each of the wire rods (Inventive steel 1, Comparative steels 4 and 5) prepared in the method of Examples 1 and 2 was drawn to obtain a steel sheet. Then, each of the steel sheets was measured for physical properties. The results are listed in the following Table 3. The drawing process was carried out at a constant strain of 3.2% or more, and a diameter of the final steel wire was 2.7 mm.
[0051]It was revealed that the Inventive steel 1 has all high physical properties such as tensile strength, twists and fatigue property, compared to those of the Comparative steels 4 and 5.
[0052]The twists represent the workability or ductility of a steel wire at maintaining its superior strength. Here, it was revealed that the Inventive steels have the superior physical properties to the Comparative steels. The superior ductility of a wire rod functions to reduce a disconnection rate of the wire rod during the drawing process and suppress the delamination in the wire rod.
[0053]Also, the fatigu...
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