Continuously cast wire rods of Cu-Zn-Sn alloy

Abstract

To provide a Cu-Zn-Sn alloy continuous cast rod with reduced casting defects and superior cold workability.SOLUTION: A Cu-Zn-Sn alloy continuous cast rod comprises Cu, Zn, and Sn, with a Cu content of 62.0 mass% or more and 70.0 mass% or less, a Sn content of 0.3 mass% or more and 0.9 mass% or less, a Zr content of 0.0050 mass% or more and 0.1000 mass% or less, a P content of 0.0050 mass% or more and 0.1000 mass% or less, with a balance being Zn and impurities, where a mass ratio of Zr to P, Zr / P, is 0.3 or more.SELECTED DRAWING: None

Claims

1. A continuously cast wire rod of a Cu-Zn-Sn alloy containing Cu, Zn, and Sn, The Cu content is in the range of 62.0 mass% to 70.0 mass%, the Sn content is in the range of 0.3 mass% to 0.9 mass%, the Zr content is in the range of 0.0050 mass% to 0.1000 mass%, the P content is in the range of 0.0050 mass% to 0.1000 mass%, and the remainder consists of Zn and impurities. The mass ratio of Zr to P, Zr / P, is set to 0.3 or higher. A continuously cast wire rod of a Cu-Zn-Sn alloy, characterized in that the number density of Zr-P compounds containing Zr and P with a diameter of 1 μm or more is within the range of 50 particles / mm² to 500 particles / mm².

2. Tensile strength of 370 N / mm ２ The Cu-Zn-Sn alloy continuous cast wire rod according to claim 1, characterized in that the elongation is 14% or more.

3. The tensile strength of the processed material after undergoing a first heat treatment (holding at 550°C for 2 hours followed by air cooling, followed by a first cold working with a reduction rate of 41%), a second heat treatment (holding at 550°C for 2 hours followed by air cooling, followed by a second cold working with a reduction rate of 41%), and a third heat treatment (holding at 450°C for 2 hours followed by air cooling, followed by a third cold working with a reduction rate of 11%) is 420 N / mm². ２ In summary, the elongation is 22% or more, and the 0.2% yield strength is 300 N / mm². ２ 350N / mm or more ２ A continuously cast wire rod of Cu-Zn-Sn alloy according to claim 1 or 2, characterized in that it is within the following range.

4. Furthermore, the Cu-Zn-Sn alloy continuous cast wire rod according to claim 1 or 2 is characterized by containing Al in a range of 0.20 mass% to 0.80 mass%.

5. Furthermore, the Cu-Zn-Sn alloy continuous cast wire rod according to claim 1 or 2 is characterized by containing Sb in a range of 0.02 mass% or more and 0.06 mass% or less.

Images