Wire rod of cu-zn-si based alloy obtained by up-drawing continuous casting

Abstract

A wire rod of a Cu—Zn—Si based alloy obtained by up-drawing continuous casting is provided; the amount of Cu is within a range of 75.0 mass% or more and 76.9 mass% or less, the amount of Si is within a range of 2.6 mass% or more and 3.1 mass% or less, the amount of Zr is within a range of 0.003 mass% or more and 0.20 mass% or less, the amount of P is within a range of 0.02 mass% or more and 0.15 mass% or less, the balance is composed of Zn and inevitable impurities, and the number density of a Zr—P compound containing Zr and P is within a range of 1500 pieces/mm2 or more and 7000 pieces/mm2 or less.

1 . A wire rod of a Cu—Zn—Si based alloy obtained by up-drawing continuous casting, comprising Cu, Zn, and Si,
 wherein an amount of Cu is within a range of 75.0 mass% or more and 76.9 mass% or less, 
 an amount of Si is within a range of 2.6 mass% or more and 3.1 mass% or less, 
 an amount of Zr is within a range of 0.003 mass% or more and 0.20 mass% or less, 
 an amount of P is within a range of 0.02 mass% or more and 0.15 mass% or less, 
 a balance is composed of Zn and inevitable impurities, and 
 a number density of a Zr—P compound containing Zr and P is within a range of 1500 pieces/mm 2  or more and 7000 pieces/mm 2  or less. 
 
     
     
         2 . The wire rod of a Cu—Zn—Si based alloy obtained by up-drawing continuous casting according to  claim 1 ,
 wherein a mass ratio Zr/P of Zr to P is less than 1.9, and a mass ratio Cu/Si of Cu to Si is more than 25. 
 
     
     
         3 . The wire rod of a Cu—Zn—Si based alloy obtained by up-drawing continuous casting according to  claim 1 ,
 wherein a mass ratio Zr/P of Zr to P is more than 4.2, and a mass ratio Cu/Si of Cu to Si is more than 25. 
 
     
     
         4 . The wire rod of a Cu—Zn—Si based alloy obtained by up-drawing continuous casting according to  claim 1 ,
 wherein a tensile strength is within a range of 500 N/mm 2  or more and 540 N/mm 2  or less, and 
 an elongation is within a range of 5% or more and 15% or less.