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A wire and quality technology, applied in heat treatment equipment, manufacturing tools, heat treatment baths, etc., can solve problems such as fracture, achieve excellent corrosion resistance and hydrogen embrittlement resistance, and excellent torsional properties

Active Publication Date: 2022-05-03
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At the same time, the higher the strength of the steel wire, the higher the risk of fracture due to the progress of corrosion or hydrogen embrittlement when the steel wire or the stranded product is used in a corrosive environment

Method used

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Embodiment

[0242] Hereinafter, the wire rod and the steel wire related to the present invention will be further specifically described by way of examples. However, the following embodiments do not limit the wire rod and steel wire involved in the present invention.

[0243] Specifically, steels having the chemical compositions shown in Table 1 and Table 2 were melted, and wire rods and steel wires were produced in the following manner. In addition, "-" in Table 1 and Table 2 indicates that the content of the element is an impurity level, and it can be judged that the element is not substantially contained. In addition, underlined numerical values ​​in Tables 2 to 5 mean that they are not within the scope of the present invention or do not satisfy the above-mentioned production method (production condition).

[0244] [Table 1]

[0245] steel number C Si mn P S Al N Cu Ni Cr Ti Cu / Ni Y1 Y2 A A0 0.82 0.22 0.70 0.004 0.005 0.031 0.0027 0.25 0.15 ...

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Abstract

A wire rod, which has a specified chemical composition, satisfies the following (1) to (3), the metal structure contains more than 90% pearlite structure, and 8 samples si collected at arbitrary equal intervals in the length direction of the wire rod In , the value of the Vickers hardness of the surface layer of each sample is Hv si , and the Hv si The average value of is set to Hv siave , the maximum value is set to Hv simax , the following (4) is satisfied. (1) [Cu] / [Ni]>1.00; (2) 1.70≦Y1≦4.50, Y1=3×[Cr]+5×[Mn]+[Cu]+[Ni]; (3)Y2<1.81 , Y2=[C]+[Si] / 10+A, as far as A is concerned, when the value of a=350×([N]‑0.29×[Ti]) is a≥0, A=a, when a When the value of =350×([N]‑0.29×[Ti]) is a<0, A=0, (4)Hv simax ‑Hv siave ≦50.

Description

technical field [0001] The invention relates to a wire. Background technique [0002] In recent years, high-strength steel wires used in the fields of high-strength rope steel wires, bridge cable steel wires, PC steel wires, and the like are required to have a high tensile strength of 1700 MPa or more. These high-strength steel wires are prepared, for example, by subjecting a rolled wire rod having a diameter of 5.0 to 16.0 mm to Sorbitizing so that the metallic structure becomes a pearlite structure, followed by wire drawing. [0003] If the tensile strength of the wire-drawn steel wire is high, it is affected by strain aging due to exothermic heat generated during the wire-drawing process, and there is a high risk of embrittlement. Due to strain aging, the number of revolutions (torsion value) until breaking in the torsion test of high-strength steel wires becomes small, and vertical cracks called delamination sometimes occur. The occurrence of delamination in the torsio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/34C22C38/16C22C38/40C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
CPCC22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/008C22C38/005C22C38/34C22C38/16C22C38/40C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/001C22C38/002C21D2211/009C21D8/065C21D1/607C21D1/32C21D1/56C21D1/46C21D1/48
Inventor 松井直树大羽浩小此木真手岛俊彦
Owner NIPPON STEEL CORP