Iron modified tin brass

Details Iron modified tin brass Iron modified tin brass

C - Chemistry, Metallurgy

22

C

C22C 9/02 (2006.01) C22C 9/04 (2006.01)

Patent

CA 2335592

There is provided a tin brass alloy having a grain structure that is refined by the addition of controlled amounts of both zinc and iron. Direct chill cast alloys containing from 1 % to 4 %, by weight of tin, from 0.8 % to 4 % of iron, from an amount effective to enhance iron initiated grain refinement to 35 % of zinc and the remainder copper and inevitable impurities are readily hot worked. The zinc addition further increases the strength of the alloy and improves the bend formability in the "good way", perpendicular to the longitudinal axis of a rolled strip. Certain of the grain refined brass alloys are useful as semisolid forming feedstock.

L'invention concerne un alliage de laiton à l'étain dont la structure granulaire est affinée par l'addition de quantités contrôlées de zinc et de fer. On travaille directement à chaud les alliages fondus en coquille, contenant 1 à 4 % en poids d'étain, 0,8 à 4 % de fer, du zinc en une quantité comprise entre une quantité efficace pour améliorer l'affinage du grain amorcée par le fer et 35 %, le solde de cuivre et les inévitables impuretés. L'addition de zinc augmente la résistance de l'alliage et améliore son aptitude à la déformation par flexion "correcte", c'est-à-dire perpendiculaire à l'axe longitudinal de la bande laminée. Certains alliages de laiton à grain affiné sont utiles comme charge semi-solide.

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