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Wire rod, steel wire using same, and billet

A wire and billet technology, applied in the field of high-strength PC stranded wire, can solve the problems of deterioration of the liquid phase hole end point and the center segregation point of the forging point, broken wires and insufficient strength, and can not improve the segregation effect of the center, so as to improve the ductility sexual effect

Active Publication Date: 2014-04-09
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This micropore becomes the starting point of a central crack (chevron crack: a type of void defect generated near the center of the base material) during the subsequent wire drawing process, causing problems of wire breakage and insufficient strength.
[0009] The offset of the liquid phase pocket end point and the forging point often leads to the deterioration of the central segregation part
Therefore, the technology of Patent Document 2 may not be able to obtain the effect of improving the segregation at the center and may deteriorate it.

Method used

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  • Wire rod, steel wire using same, and billet
  • Wire rod, steel wire using same, and billet
  • Wire rod, steel wire using same, and billet

Examples

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Embodiment 1

[0089] Embodiments of the present invention will be described below.

[0090] Steel types A to J having the chemical compositions shown in Table 1 were melted and continuously cast under the manufacturing conditions (steelmaking) shown in Table 2 to produce slabs (blooms) of 500 mm×300 mm. This cast slab was heated at 1250° C. for 45 minutes, and then slab-rolled to produce a 122 mm×122 mm billet (billet). The slab was heated under the manufacturing conditions (after steelmaking) shown in Table 2, rolled by a conventional method, and then coiled under the conditions shown in Table 2 to produce wire rods with a diameter of 12 mm and a diameter of 5.5 mm . The wire rods with a diameter of 12 mm and a diameter of 5.5 mm were further heat-treated under the conditions shown in Table 2.

[0091] In addition, in Table 1, "-" indicates that below the measurement limit, the remainder includes iron and impurities.

[0092] Table 1

[0093] (quality%)

[0094] ...

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Abstract

If an area that is formed concentrically inward from a surface of a wire rod and whose cross section ratio with respect to the cross sectional area of a cross section of the wire rod is between 13% and 56% is defined as area I, an area that widens concentrically about the central axis of the wire rod and whose cross section ratio with respect to the cross sectional area of the wire rod is between 3% and 11% is defined as area III, and an area between area I and area III is defined as area II, then area I is a first negative segregation portion where the degree of C segregation with respect to the average C concentration of the wire rod is between 0.75 and 0.95, area II is a positive segregation portion where the degree of C segregation is between 1.00 and 1.10, area III is a second negative segregation portion where the degree of C segregation is between 0.80 and 0.95; and the wire rod has a sandwich structure in which the first negative segregation portion, the positive segregation portion, and the second negative segregation portion are placed in order from the surface.

Description

technical field [0001] The invention relates to a wire used as a high-strength steel wire base material, which is used in the fields of high-strength steel cables, mooring ropes for submarine oilfield drilling platforms, PWS (parallel steel wire bundles) for bridges, high-strength PC strands, etc. . Furthermore, the present invention also relates to a steel wire produced from the wire rod, and a steel billet that can be used to produce the steel wire. [0002] This application is based on Japanese Patent Application Japanese Patent Application No. 2012-089220 for which it applied on April 10, 2012, and the priority is claimed, and uses the content here. Background technique [0003] The steel wire used in the above fields requires high strength (for example, the tensile strength is above 2000MPa). In wire rods used for steel wires requiring such a high strength, the formation of micropores tends to be promoted by the action of fine martensite existing in the central segreg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/00B21B1/16B21C1/00C21D8/06C21D9/52C22C38/00C22C38/04C22C38/32
CPCC22C38/32C22C38/00C21D8/06C22C38/06C22C38/04C22C38/24C22C38/002B21B1/16C21D9/52C22C38/18B22D11/00C22C38/02C21D8/065C21D2221/10
Inventor 大羽浩喜多昭夫小此木真
Owner NIPPON STEEL CORP
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