Copper alloy material and manufacturing method thereof, resistance material for resistor using same, and resistor

摘要

The copper alloy strip of the present invention contains 3% by mass or more and 20% by mass or less of manganese (Mn), and the balance is a copper alloy strip having a composition consisting of copper (Cu) and unavoidable impurities. It is characterized in that the ratio of the Mn content to the Cu content (surface layer [Mn/Cu] ratio) measured in the surface layer region partitioned at a position of 0.05 μm in the depth direction from the surface is less than 0.030 in terms of mass ratio, even if the environmental temperature changes It has stable resistance and has good solder mountability.