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Wire rod and steel wire using same

A wire rod and steel wire technology, applied in the direction of furnace type, furnace, heat treatment furnace, etc., can solve the problems of different hydrogen diffusion behaviors, achieve excellent delayed fracture resistance, and improve the effect of twisting characteristics

Active Publication Date: 2014-12-10
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the structure is different, the diffusion behavior of hydrogen is also different, and the size and amount of precipitates that are suitable as trapping points are different. Therefore, this technology cannot be directly applied to PC steel wires whose main phase is pearlite structure.

Method used

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

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0023] The inventors of the present invention found that, in a wire rod whose main phase is pearlite, it is effective to secure a predetermined amount of AlN serving as hydrogen trapping sites, and to secure a predetermined amount or more of AlN having a size of 10 to 20 μm.

[0024] The larger the amount of AlN, the higher the hydrogen trapping effect, so it is made 0.005% or more. The amount of AlN is preferably 0.006% or more, more preferably 0.007% or more (especially 0.01% or more). The upper limit of the amount of AlN is not particularly limited, but is usually about 0.04%.

[0025] In addition, as an index for securing the number of AlNs having a size of 10 to 20 μm, the maximum extreme value distribution is used in the present invention. First, as the size of AlN, the square of the product of length a and thickness b of AlN (ab) is used 1 / 2 , denoting it as d GM (μm). In the present invention, the length a of AlN refers to the length of AlN in the longitudinal dire...

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Abstract

The wire rod of the present invention includes predetermined amounts of C, Si, Mn, N, Al, P, and S, the remainder being iron and unavoidable impurities, the amount of Al and the amount of N satisfying the relationship indicated by equation (1): [Al] <= -2.1 × 10 × [N] + 0.255 (where [Al] and [N] in equation (1) are the content (mass%) of Al and N, respectively), at least 95 area% of the structure being a pearlite structure, the amount of AlN being at least 0.005%, and the ratio of AlN for which the AlN diameter dGM is 10-20 µm in the extreme-value distribution of the maximum values of dGM, expressed as the geometric mean (ab)1 / 2 of the length a and the thickness b, being at least 50% on a number basis. In this wire rod, reduction of delayed-fracture resistance characteristics that accompanies increasing of strength is suppressed, and the wire rod can be used in high-strength PC steel wire, wire rope, etc., having delayed-fracture resistance characteristics suitable for building codes.

Description

technical field [0001] The present invention relates to wire materials used for PC steel wires, steel cables, and the like, and steel wires using the same. Background technique [0002] In the field of civil engineering and construction, there is an increasing demand for high strength and lightweight concrete members, and prestressed concrete (hereinafter referred to as PC) in which compressive stress is imparted to concrete using steel wires is known as a strengthening method for concrete members. It is also known that the steel wire used for PC, that is, the higher the strength of the PC steel wire, the more it contributes to the high strength and light weight of the PC. In practice, as stipulated in JIS G3536, for example The 7 twisted wires, the maximum test force is about 261kN. [0003] In addition, from the viewpoint of building safety and the like, PC steel wires have various specifications and recommended tests other than JIS standards. In particular, when applyi...

Claims

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Application Information

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IPC IPC(8): C22C38/00C22C38/06C22C38/58C21D8/06C21D9/52
CPCC21D9/02C21D2211/009C22C38/002C21D8/065C21D2211/004C22C38/04C21D8/08C22C38/00C22C38/06C22C38/02C21D9/52C22C38/58C22C38/001C21D8/06C22C38/08C22C38/10C22C38/12C22C38/16C22C38/18
Inventor 石田友信吉原直
Owner KOBE STEEL LTD
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