Cu-Ni-Si Cu-Ni-Si BASED COPPER ALLOY SHEET HAVING HIGH DIE ABRASION RESISTANCE AND GOOD SHEAR PROCESSABILITY AND METHOD FOR PRODUCING SAME

摘要

The steel sheet according to any one of the above items (1) to (3), wherein the steel sheet has an excellent abrasion resistance and shear processability while maintaining strength and conductivity, and contains 1.0 to 4.0 mass% of Ni and 0.2 to 0.9 mass% of Si with the balance being Cu and inevitable impurities, When the number of Ni-Si precipitate particles of 20 to 80 nm is 1.5 x 10 ⁶~ 5.0 10⁶Mm 2 and the number of Ni-Si precipitate particles whose surface has a particle diameter of 100 nm or more is 0.5 x 10 ⁵~ 4.0 10⁵The number of Ni-Si precipitate particles having a particle diameter of 20 to 80 nm in the surface layer having a thickness from the surface of 20% of the total plate thickness is a / mm 2, Wherein a / b is 0.5 to 1.5 and the concentration of Si solid solution in the crystal grains in the thickness range of less than 10 from the surface is 0.03 to 0.4 mass% when the number of Ni-Si precipitates of 80 nm is b number / to be.