Copper alloy material for electrical/electronic equipments, and electrical/electronic part

Abstract

A copper alloy material for an electrical/electronic equipment, containing Ni 3.3 to 5.0 mass %, having a content of Si within the range of 2.8 to 3.8 in terms of a mass ratio of Ni and Si (Ni/Si), and containing Mg 0.01 to 0.2 mass %, Sn 0.05 to 1.5 mass %, and Zn 0.2 to 1.5 mass %, with the balance of Cu and inevitable impurities, wherein when a test piece with thickness t of 0.20 mm and width w of 2.0 mm is subjected to 90° W-bending with bending radius R of 0.1 mm, no cracks occur on the test piece; and, an electrical/electronic part obtained by working the same.

1 . A copper alloy material for an electrical/electronic equipment, containing Ni 3.3 to 5.0 mass %, having a content of Si within the range of 2.8 to 3.8 in terms of a mass ratio of Ni and Si (Ni/Si), and containing Mg 0.01 to 0.2 mass %, Sn 0.05 to 1.5 mass %, and Zn 0.2 to 1.5 mass %, with the balance of Cu and inevitable impurities, wherein when a test piece with thickness t of 0.20 mm and width w of 2.0 mm is subjected to 90° W-bending with bending radius R of 0.1 mm, no cracks occur on the test piece. 
     
     
         2 . The copper alloy material for an electrical/electronic equipment according to  claim 1 , which is produced by subjecting a cast ingot to a hot rolling, a dough (cold) rolling, and a solution treatment, followed by an intermediate (cold) rolling with rolling ratio of 5 to 50%, an aging at 400 to 600° C. for 0.5 to 12 hours, a finish (cold) rolling with rolling ratio of 30% or less, and a low-temperature annealing, in this order. 
     
     
         3 . The copper alloy material for an electrical/electronic equipment according to  claim 1 , which is produced by subjecting a cast ingot to a hot rolling, a dough (cold) rolling, and a solution treatment, followed by an aging at 300 to 400° C. for 0.5 to 8 hours, a further aging at 425 to 600° C. for 0.5 to 12 hours, a finish (cold) rolling, and a low-temperature annealing, in this order. 
     
     
         4 . The copper alloy material for an electrical/electronic equipment according to  claim 1 , which is produced by subjecting a cast ingot to a hot rolling, a dough (cold) rolling, and a solution treatment, followed by an intermediate (cold) rolling with rolling ratio of 5 to 50%, an aging at 300 to 400° C. for 0.5 to 8 hours, a further aging at 425 to 600° C. for 0.5 to 12 hours, a finish (cold) rolling with rolling ratio of 30% or less, and a low-temperature annealing, in this order. 
     
     
         5 . A copper alloy material for an electrical/electronic equipment, containing Ni 3.3 to 5.0 mass %, having a content of Si within the range of 2.8 to 3.8 in terms of a mass ratio of Ni and Si (Ni/Si), and containing Mg 0.01 to 0.2 mass %, Sn 0.05 to 1.5 mass %, Zn 0.2 to 1.5 mass %, and one or more selected from the group consisting of Ag, Co, and Cr in a sum total of 0.005 to 2.0 mass %, with the balance of Cu and inevitable impurities, wherein when a test piece with thickness t of 0.20 mm and width w of 2.0 mm is subjected to 90° W-bending with bending radius R of 0.1 mm, no cracks occur on the test piece. 
     
     
         6 . The copper alloy material for an electrical/electronic equipment according to  claim 5 , which is produced by subjecting a cast ingot to a hot rolling, a dough (cold) rolling, and a solution treatment, followed by an intermediate (cold) rolling with rolling ratio of 5 to 50%, an aging at 400 to 600° C. for 0.5 to 12 hours, a finish (cold) rolling with rolling ratio of 30% or less, and a low-temperature annealing, in this order. 
     
     
         7 . The copper alloy material for an electrical/electronic equipment according to  claim 5 , which is produced by subjecting a cast ingot to a hot rolling, a dough (cold) rolling, and a solution treatment, followed by an aging at 300 to 400° C. for 0.5 to 8 hours, a further aging at 425 to 600° C. for 0.5 to 12 hours, a finish (cold) rolling, and a low-temperature annealing, in this order. 
     
     
         8 . The copper alloy material for an electrical/electronic equipment according to  claim 5 , which is produced by subjecting a cast ingot to a hot rolling, a dough (cold) rolling, and a solution treatment, followed by an intermediate (cold) rolling with rolling ratio of 5 to 50%, an aging at 300 to 400° C. for 0.5 to 8 hours, a further aging at 425 to 600° C. for 0.5 to 12 hours, a finish (cold) rolling with rolling ratio of 30% or less, and a low-temperature annealing, in this order. 
     
     
         9 . An electrical/electronic part obtained by working a copper alloy material for an electrical/electronic equipment, with the copper alloy material containing Ni 3.3 to 5.0 mass %, having a content of Si within the range of 2.8 to 3.8 in terms of a mass ratio of Ni and Si (Ni/Si), and containing Mg 0.01 to 0.2 mass %, Sn 0.05 to 1.5 mass %, and Zn 0.2 to 1.5 mass %, with the balance of Cu and inevitable impurities, wherein when a test piece of the copper alloy material with thickness t of 0.20 mm and width w of 2.0 mm is subjected to 90° W-bending with bending radius R of 0.1 mm, no cracks occur on the test piece. 
     
     
         10 . An electrical/electronic part obtained by working a copper alloy material for an electrical/electronic equipment, with the copper alloy material containing Ni 3.3 to 5.0 mass %, having a content of Si within the range of 2.8 to 3.8 in terms of a mass ratio of Ni and Si (Ni/Si), and containing Mg 0.01 to 0.2 mass %, Sn 0.05 to 1.5 mass %, Zn 0.2 to 1.5 mass %, and one or more selected from the group consisting of Ag, Co, and Cr in a sum total of 0.005 to 2.0 mass %, with the balance of Cu and inevitable impurities, wherein when a test piece of the copper alloy material with thickness t of 0.20 mm and width w of 2.0 mm is subjected to 90° W-bending with bending radius R of 0.1 mm, no cracks occur on the test piece.