Steel wire and hot-rolled wire material

A technology of steel wire and spherical carbide, applied in the field of steel wire and hot-rolled wire rod, can solve the problems of metal mold wear, processing cracks and damage of formed parts, etc.

Pending Publication Date: 2021-11-26
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, if the content of alloy elements increases, the deformation resistance of the steel material increases or the ductility decreases, so the load on the metal die increases during cold forging, and the wear and damage of the metal die occur, and processing cracks occur on the formed part. And other issues

Method used

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  • Steel wire and hot-rolled wire material
  • Steel wire and hot-rolled wire material
  • Steel wire and hot-rolled wire material

Examples

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Embodiment

[0197] Hereinafter, the steel wire of the present invention will be described more specifically. However, these examples do not limit the steel wires of the present invention.

[0198] [Made of steel wire]

[0199] A steel sheet having a steel species A to P, which is composed of the components shown in Table 1, and the steel wires are fabricated as follows from Tables 2-1 to T 3-2, which will be described below. It should be noted that the part indicated in "-" in Table 1 is not intentionally added to the elements in the column.

[0200] Further, in Tables 2-1 to T 3, the underscore portion indicates that it is not included in the scope of the present invention or is not included in the optional preferred range.

[0201]

[0202] Specifically, the steel wires of the test numbers 1 to 16, 32 to 36, 41 shown in Tables 2-1 to T 3-4 are manufactured as follows.

[0203]First, the steel sheet after heating, hot rolling, resulting in a ring wire, immersed in the molten salt bath is p...

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PUM

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Abstract

A steel wire which has a component composition comprising 0.10 to 0.60% of C, 0.01 to 0.50% of Si, 0.20 to 1.00% of Mn, 0.030% or less of P, 0.050% or less of S, 0.85 to 1.50% of Cr, 0.001 to 0.080% of Al, 0.0010 to 0.0200% of N, and a remainder made up by Fe, impurity elements and arbitrary elements, and includes a center axis of the steel wire, wherein, in a cross section parallel to the center axis, 95% by area or more of the metal structure is made up by ferrite and a spherical carbide, ferrite grains have an average grain diameter of 10.0 to 30.0 [mu]m, spherical carbide particles each having an equivalent circle diameter of 0.1 [mu]m or more have an average aspect ratio of 2.5 or less, and the number of the spherical carbide particles each having an equivalent circle diameter of 0.1 [mu]m or more is 1.5*10<6>*[C] to 7.0*10<6>*[C] particles / mm2, wherein [C] represents the content (% by mass) of C in the steel wire.

Description

Technical field [0001] The present invention relates to a steel wire and a hot rolled wire. [0002] The present application claims priority in Japan, 2019-092640, proposed in Japan, issued by Japan, 2019, and references its content. Background technique [0003] Since cold forging is excellent in size accuracy, productivity, etc. in the molded article, therefore in the molding of mechanical components such as steel bolts, screws, nuts, cold forging is replacing conventional hot forging. Further, the components such as bolts, nuts are used in structural use, and therefore, all alloy elements such as C, Mn, CR are added to impart intensity. [0004] However, if the alloy element content is increased, the deformed resistance of the steel is increased or the ductility is lowered, so there is an increase in the load of the metal mold while the metal mold is increased, and the molding unit is generated on the molding unit. And other issues. [0005] In addition, in recent years, the c...

Claims

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Application Information

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IPC IPC(8): C21D8/06C22C38/00C22C38/18C22C38/54
CPCC22C38/00C21D8/06C22C38/54C22C38/18C22C38/60C22C38/001C22C38/50C22C38/44C22C38/42C22C38/46C22C38/48C21D8/0226C21D8/065
Inventor 小此木真松井直树山崎浩一
Owner NIPPON STEEL CORP
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