Bronze-based alloy of low lead content

C - Chemistry – Metallurgy – 22 – C

Patent

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Details

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

Patent

CA 2603811

The object of the present invention is to provide a bronze-based alloy of low lead content, first improved in tensile strength at high temperatures, secondly contributing to the promotion of the environmental conservation including recycling, while avoiding the adverse effect of lead on human bodies by means of reduction of a lead content, and excellent from the standpoints of mass-productivity and manufacturing cost. The alloy includes 2.0 to 6.0 mass % of Sn, 3.0 to 10.0 mass % of Zn, 0.1 to 3.0 mass % of Bi, 0.1 mass % < P <= 0.6 mass % and the remainder of Cu and unavoidable impurities to improve the tensile strength thereof at high temperatures.

L~invention concerne un alliage de bronze à tête basse étant amélioré d~une part au niveau de la résistance à la traction à des températures élevées, et d~autre part au niveau de la contribution à la protection environnementale, telle que par le recyclage, tout en évitant tout effet indésirable sur le corps humain par le biais d~une teneur en plomb réduite, et permettant en outre de réaliser une excellente productivité de masse et d~excellents coûts. L~invention a également pour objectif d~assurer la qualité des coulages. L~invention concerne un alliage de bronze à tête basse présentant une résistance à la traction améliorée à des températures élevées, comprenant, en pourcentage massique, de 2,0 à 6,0 % de Sn, de 3,0 à 10,0 % de Zn, de 0,1 à 3,0 % de Bi, plus de 0,1 à 0,6 % de P, le reste étant du Cu et d~inévitables impuretés.

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