The invention discloses a remelted low-lead low-
bismuth copper alloy with no hot crack and relates to the field of
metal alloy material
manufacturing technology. The remelted low-lead low-
bismuth copper alloy with no hot crack comprises the following components of: by weight, 58-61% of Cu, 0.3-0.8% of Al, 0.009-0.35% of Zr, 0.008-0.035% of B, 0.05-0.20% of Pb, 0.1-0.40% of Bi, Mn being less than 0.15%, Si being less than 0.15%, Sn being less than 0.35%, Fe being less than 0.35%, and the balance being
zinc and unavoidable impurities, wherein the total amount of the impurities is less than 0.25%. According to the
copper alloy, the contents of the lead element and the
bismuth element are minimized, thus reducing the harm to the environment and
human body and decreasing the cost; The purity of gravity
ingot casting melting is excellent, fluidity of the
casting process is excellent, and thermal stress
crack resistance is strong; the density of the
microstructure is high, and
crystal grains are fine and uniform; the
cutting ability is raised, the
polishing degree is excellent, there is no
welding stress crack, the
corrosion resistance is raised, and old copper materials can be recycled and reused while the
cutting ability of the
copper alloy is guaranteed.