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High-strength wire rod having superior rod drawability, manufacturing method therefor

A high-strength, tensile-strength technology, applied in the field of steel wire, can solve problems such as increased wire breaking frequency, deterioration of ductility and toughness, and decreased wire fracture drawing value.

Active Publication Date: 2008-06-25
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the fracture drawing value of the toughened wire rod decreases, the ductility and toughness deteriorate, and the frequency of wire breakage during the wire drawing process also increases, resulting in a decrease in productivity and yield.

Method used

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  • High-strength wire rod having superior rod drawability, manufacturing method therefor
  • High-strength wire rod having superior rod drawability, manufacturing method therefor

Examples

Experimental program
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Embodiment

[0092] Hereinafter, the present invention will be described in more detail by enumerating the examples, but the present invention is not limited by the following examples at all, and of course can be appropriately changed and implemented within the scope consistent with the purpose described before and after, and these are also included in the present invention within the technical range.

[0093] Sample making method

[0094] The test steel having the composition shown in Table 1 and Table 3 was made into a billet with a cross-sectional size of 300×500 mm by continuous casting equipment, and then a billet with a square cross-section of 122 mm was produced by block rolling. Then, roll the wire rods with the diameters shown in Table 2 and Table 4, and after coiling at a specified temperature, perform direct molten salt quenching (DLP) or reheating molten lead quenching (LP) cooling within a specified period of time to obtain this Inventive high-strength wire rods (present inve...

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PUM

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Abstract

A wire rod composed mainly of pearlite either having a cross section wherein the average of area ratio of non-pearlite structures consisting of pro-eutectoid ferrite, pseudopearlite and bainite is 5% or below, or having a portion extending from the surface layer to a depth of up to 100 [mu]m wherein the average of area ratio of non-pearlite structures is 10% or below, which high-strength wire rod is produced by subjecting a hard steel wire rod of specified components to hot rolling and thereafter either direct molten salt patenting or re-austenitizing and subsequent molten salt or lead patenting.

Description

technical field [0001] The present invention relates to a high-strength hot-rolled wire rod with excellent wire-drawing performance for drawing into PC steel wire, galvanized steel strand, steel wire for springs, cables for suspension bridges, etc. steel wire. [0002] This application claims priority based on Japanese Patent Application No. 2005-190258 filed on June 29, 2005, and uses the content thereof here. Background technique [0003] When manufacturing high-carbon steel wire, the hot-rolled wire rod is usually subjected to toughening treatment according to needs, and then drawn to make steel wire with a specified wire diameter. However, it has been required to ensure the strength above 1600MPa through such treatment. The ductility and toughness evaluated by deep value etc. also ensure good performance. [0004] In response to the above-mentioned demands, attempts have been made to improve the wire-drawability of high-carbon steel wire rods by controlling segregation...

Claims

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Application Information

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IPC IPC(8): C22C38/00C21D8/06C22C38/06C22C38/54
CPCC21D2211/009C22C38/00C22C38/14C22C38/002C21D8/065C22C38/04C21D2211/005C21D2211/002C22C38/02C22C38/001C22C38/06C22C38/10C22C38/12C22C38/22C22C38/32C22C38/52C22C38/54
Inventor 山崎真吾矶新西田世纪
Owner NIPPON STEEL CORP