Hot-rolled wire rod, excellent in wire drawability, allowing...

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

C22C 38/40 (2006.01) B21B 1/16 (2006.01) B21B 3/00 (2006.01) B21B 43/00 (2006.01) C22C 38/00 (2006.01) C22C 38/04 (2006.01) C22C 38/18 (2006.01) C22C 38/54 (2006.01) C21D 8/06 (2006.01)

Patent

CA 2500108

A hot-rolled wire rod: the wire rod being a hot-rolled wire rod 5.0 mm or more in diameter, containing in mass C: 0.6 to 1.0%, Si: 0.1 to 1.5%, Mn: 0.3 to 1.0%, P: 0.02% or less, and S: 0.02% or less; not less than 90% of the wire rod in area percentage being composed of a pearlite structure; and the mechanical properties of the wire rod 4 m in length satisfying the following expressions (1) to (4), (1) TS*-30 <= Average value of tensile strength (TS AV in MPa) <= TS*+30, where, TS* = 400 × {[C]+([Mn]+[Si])/5}+670 and the elements in square brackets [ ] in the equality mean the contents of relevant elements in percentage, (2) Standard deviation of tensile strength (TS.sigma.) <= 30 MPa, (3) Average value of reduction of area (RA AV) > 35%, (4) Standard deviation of reduction of area (RA.sigma.) <= 4%. A hot-rolled wire rod according to the present invention is incomparably excellent in wire drawability and brakes less frequently than a conventional wire rod even when it is processed as hot-rolled with heat treatment such as patenting treatment omitted.

L'invention concerne une tige de fil métallique laminé à chaud d'au moins 5,0 mm de diamètre, comprenant : entre 0,6 et 1,0 % de C (en termes de % en poids, applicable ici) ; entre 0,1 et 1,5 % de Si, et entre 0,3 et 1,0 % de Mn, P étant limité à 0,02 % ou moins et S étant limité à 0,02 % ou moins et où au moins 90 % de la surface sont à base de structure de perlite. Ladite tige de fil métallique laminée à chaud manifeste, à une longueur de 4 m, des propriétés mécaniques satisfaisant à : (1) TS*-30 = moyenne de résistance à la traction (TSav :MPa) = TS*+30, où TS* = 400x{[C]+([Mn}+[Si])/5}+670 où [] désigne le titrant (%) de chaque élément ; (2) écart normalisé de la résistance à la traction (TS sigma )= 30 MPa ; (3) moyenne de réduction de la zone de rupture (RAav) > 35 %, et (4) écart normalisé de réduction de la zone de rupture (RA sigma )= 4 %. Cette tige de fil métallique laminée à chaud présente d'excellentes qualités de tréfilage, uniquement par laminage à chaud, même lorsque le traitement thermique tel que le patentage est évité et permet, comparativement à des tiges conventionnelles, de réduire la fréquence de rupture de fils métalliques.

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