Wire rod, steel wire and method for producing steel wire
A wire rod and steel wire technology, which is applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of deterioration, inability to effectively take into account the torsion characteristics of broken wires, and inability to suppress the deviation of steel wire strength, etc.
Active Publication Date: 2021-08-31
NIPPON STEEL CORP
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Problems solved by technology
However, only controlling the form of cementite cannot suppress the variation in strength within the cross-section of the steel wire.
Therefore, in the case of manufacturing a steel wire having a wire diameter of 0.5 mm or more using the techniques disclosed in these patent documents, the suppression of occurrence of wire breakage and the suppression of deterioration of torsional characteristics cannot be effectively achieved at the same time, and the above-mentioned problems may occur.
Method used
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Embodiment
[0138] The following examples illustrate the present invention, but the present invention is not limited by the following examples.
[0139] Steels having the chemical compositions shown in Tables 1 and 2 were melted, and wire rods were produced by the following method. In addition, "-" in Table 1, Table 2 shows that content of the said element is an impurity level, and it can be judged that it does not contain substantially. The balance of the chemical composition of the steel shown in Table 1 and Table 2 is iron and impurities.
[0140] First, after steel A having the chemical composition shown in Table 1 was smelted in a converter, a billet of 122 mm square was obtained by billet rolling by a usual method. Next, after heating so that the billet may become 1050-1150 degreeC, it hot-rolls to Φ6mm at the finish rolling temperature of the range of 900-1000 degreeC.
[0141] About the conditioning cooling after finish rolling, cooling was performed under the conditions shown i...
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Abstract
The wire rod according to one aspect of the present invention has a chemical composition within a predetermined range, a pearlite structure as the main structure in both the surface layer part and the center part, the area ratio of the ferrite structure is 45% or less, and the non-pearlite structure is non-pearlite. The area ratio of solid and non-ferrite structure is 5% or less, and the density ρ1 of the subgrain boundary in which the angle difference of the crystal orientation of layered ferrite in the pearlite structure is 2° or more and less than 15° is 70 / mm≤ρ1≤600 / mm, and the density ρ2 of high-angle grain boundaries at which the angle difference of ferrite crystal orientation is 15° or more in the entire structure is 200 / mm or more.
Description
technical field [0001] The present invention relates to a wire rod, a steel wire and a method for manufacturing the steel wire. [0002] This application claims priority based on Patent Application No. 2017-099227 filed in Japan on May 18, 2017, the contents of which are incorporated herein by reference. Background technique [0003] The present invention relates to a wire material widely used as a raw material of a high-strength steel wire used for a metal wire used as a reinforcing material for a tire of an automobile or the like, a reinforcing wire for aluminum transmission wires, etc., a PC steel wire, Metal wires for ropes used in bridges, etc. In addition, the present invention relates to a steel wire obtained from the wire rod and a method for producing a steel wire using the wire rod. [0004] The wire rod is manufactured by hot rolling, and processed into a wire by wire drawing to a predetermined wire diameter. In the middle of the wire drawing process, about 1 o...
Claims
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IPC IPC(8): C22C38/00C22C38/04C22C38/34C21D8/06C21D9/52
CPCC21D8/06C21D9/52C22C38/00C22C38/04C22C38/34
Inventor 手岛俊彦松井直树矶新
Owner NIPPON STEEL CORP