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Plated steel wire for PWS excelling in torsion property and process for producing the same

A manufacturing method, a technology of electroplating steel, applied in the direction of manufacturing tools, furnace types, furnaces, etc., can solve the problems of reduced fracture section shrinkage, low production efficiency and pass rate, high frequency of wire breakage, etc., and achieve good torsional characteristics Effect

Active Publication Date: 2009-05-06
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, the fracture area shrinkage of the toughened wire rod decreases, the ductility deteriorates, and the frequency of wire interruption during wire drawing increases, which leads to problems of low production efficiency and yield.

Method used

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  • Plated steel wire for PWS excelling in torsion property and process for producing the same
  • Plated steel wire for PWS excelling in torsion property and process for producing the same
  • Plated steel wire for PWS excelling in torsion property and process for producing the same

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Embodiment

[0116] The following examples are given to illustrate the present invention more specifically, but the present invention is not limited to the following examples, and appropriate changes can be carried out within the scope of the gist of the present invention, and they are all included in the technical scope of the present invention .

[0117] [Sample making method]

[0118] Table 1, 2 and Table 5, 6 show the chemical composition of the sample material, toughening treatment conditions and mechanical properties of the wire. These sample materials were used to hot-roll into wire rods of predetermined diameters, coiled at predetermined temperatures, and then subjected to direct molten salt toughening (DLP) or reheating molten lead toughening (LP) within a predetermined period of time. At this time, even in Examples with the same composition, the amount of precipitated B nitrides differs depending on the elapsed time from coiling to toughening treatment, so the amount of solid so...

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Abstract

A plated steel wire for PWS excelling in torsion property comprising, by mass, 0.8 to 1.1% C, 0.8 to 1.3% Si, 0.3 to 0.8% Mn, 0.001 to 0.006% N and 0.0004 to 0.0060% B provided that B in the state of solid solution is 0.0002% or more, and further comprising either 0.005 to 0.1% Al or 0.005 to 0.1% Ti or both with the balance composed of Fe and unavoidable impurities. In the plated steel wire, the areal ratio of non-pearlite structure is 10% or below in the zone from its surface layer to a depth of 50 [mu]m and 5% or below in the whole cross section thereof, and the surface thereof is provided with a zinc plating at a plating weight of 300 to 500 g / m<2>.

Description

technical field [0001] The present invention relates to a galvanized steel wire for PWS with good torsional characteristics, which is used for suspending bridges and the like, and to a manufacturing method thereof. [0002] This application of the present invention claims the priority of Japanese Patent Application No. 2007-022412 filed on January 31, 2007, and its content is incorporated into the present invention. Background technique [0003] In the past, when manufacturing high-strength electroplated steel wires for PWS (parallel steel strands), it is generally necessary to toughen the hot-rolled wire rods, and then turn them into steel wires with a predetermined wire diameter through wire drawing, and then galvanize them. Imparts corrosion resistance. Through such treatment, not only the strength of TS≥2192-61×d (where TS is the tensile strength (MPa) and d is the wire diameter (mm)) is ensured, but also the toughness evaluated by the fracture area shrinkage rate is en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B21C1/00C21D8/06C21D9/52C22C38/14C22C38/54
CPCC22C38/02B21C1/003C22C38/04C22C38/001Y10T428/2958Y10T29/49986Y10T428/2938Y10T428/12799Y10T428/2913C22C38/06C22C38/14
Inventor 真锅敏之山崎真吾西田世纪
Owner NIPPON STEEL CORP
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