High strength and high toughness steel wires and method for...

Details High strength and high toughness steel wires and method for... High strength and high toughness steel wires and method for...

C - Chemistry, Metallurgy

21

D

C21D 7/10 (2006.01) C21D 8/06 (2006.01)

Patent

CA 2213929

Steel wires which is higher in strength and better in toughness than those wires whose lamellar cementite consists of nano crystals and does not suffer any delamination when subjected to torsion. A steel wire is composed mainly of fine pearlite and/or degenerated pearlite wherein lamellar cementite in the structure is amorphous Alternatively, the wire may be composed mainly of bainite. In this case, the cementite in the structure should be amorphous. For the manufacture of the steel wire, a starting steel product is subjected to patenting and cold drawing repeatedly plural times, followed by final drawing at a true strain of 2.0 or above while cooling.

Fil d'acier de plus grande résistance et solidité que les fils dont la cémentite lamellaire est constituée de nano cristaux et ne subissant pas de délaminage lorsqu'il est soumis à une torsion. Ce fil d'acier est principalement constitué de perlite nodulaire et/ou de perlite dégénérée pour laquelle la cémentite lamellaire de sa structure est amorphe. Ou bien ce fil peut être surtout constitué de bainite. Dans ce dernier cas, la cémentite de sa structure devrait être amorphe. Pour fabriquer ce fil d'acier, un produit de départ en acier est soumis à une opération de patentage et étiré à froid à plusieurs reprises, après quoi il subit un étirage final selon une déformation rationnelle d'au moins 2.0 au cours de l'étape de refroidissement.

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