Method for producing by continuous heat treatments...

C - Chemistry – Metallurgy – 21 – D

Patent

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C21D 1/22 (2006.01) C21D 1/19 (2006.01) C21D 1/44 (2006.01) C21D 1/50 (2006.01) C21D 9/52 (2006.01)

Patent

CA 2065641

Disclosed herein is a method for continuously hardening and tempering oil-tempered steel wires for springs having high strength and high toughness, and which meet a requirement for weight reduction. The method is applicable to medium-carbon low-alloy spring steel having a chemical composition which does not undergo martensitic transformation substantially upon oil hardening alone and thus has an Mf point lower than 80° C. The steel is one which contains carbon in amount of 0.40-0.65 weight %, Si, Mn, and at least one species selected from the group consisting of Cr, Ni, Mo and V. The method comprises performing a two-step accelerated hardening consisting of subjecting the heated spring steel to oil hardening, wiping oil from the steel, followed immediately by water hardening to produce a hardened steel. Subsequently, tempering is performed on the hardened steel to produce a tempered steel.

La présente divulgation concerne une méthode pour le durcissement et la trempe à l'huile en continu de fils d'acier destinés à la fabrication de ressorts haute résistance et haute ténacité, pour des applications exigeant une masse réduite. La méthode convient à l'acier à ressorts demi-dur faiblement allié, d'une composition chimique dont la trempe à l'huile ne provoque pas à elle seule la transformation martensitique, et dont le point de fin de transformation martensitique est inférieur à 80 degrés Celsius. L'acier a une teneur en carbone de l'ordre de 0,40 à 0,65 % en poids, contient du Si, du Mn et au moins un métal choisi dans les groupes suivants : Cr, Ni, Mo et V. La méthode consiste à exécuter d'abord un durcissement accéléré en deux étapes, soit à soumettre l'acier à ressorts chauffé à un durcissement à l'huile et à le dégraisser avant de le durcir immédiatement à l'eau, pour obtenir un acier durci. Puis l'acier durci est soumis au trempage, ce qui donne un acier trempé.

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