Manufacturing method of copper alloy sheet

Patent metadata

Field	Value
Publication number	US-9493859-B2
Application number	US-201414528311-A
Country	US
Kind code	B2
Filing date	Oct 30, 2014
Priority date	Apr 5, 2010
Publication date	Nov 15, 2016
Grant date	Nov 15, 2016

Abstract

Manufacturing method of a copper alloy sheet including melting and casting a raw material of a copper alloy having a composition containing 1.0 mass % to 3.5 mass % Ni, 0.5 mass % to 2.0 mass % Co, and 0.3 mass % to 1.5 mass % Si with a balance being composed of Cu and an unavoidable impurity. The method includes the steps of first cold rolling, intermediate annealing, second cold rolling, a solution heat treatment and aging. The solution heat treatment includes: heating at 800° C. to 1020° C.; first quenching to 500° C. to 800° C.; maintaining the 500° C. to 800° C. temperature for 10 seconds to 600 seconds; and second quenching to 300° C. or lower.

First claim

What is claimed is:

1. A manufacturing method of a copper alloy sheet comprising:
a melting/casting step of melting and casting a raw material of a copper alloy having a composition consisting of 1.0 mass% to 3.5 mass% Ni, 0.5 mass% to 2.0 mass% Co, and 0.3 mass% to 1.5 mass% Si with a balance being composed of Cu and an unavoidable impurity;
a hot rolling step of performing hot rolling after said melting/casting step;
a first cold rolling step of performing cold rolling after said hot rolling step;
an intermediate annealing step of performing heat treatment at a heating temperature of 500° C. to 650° C. after said first cold rolling step;
a second cold rolling step of performing cold rolling with a rolling ratio of 70% or more after said intermediate annealing step;
a solution heat treatment step of performing solution heat treatment after said second cold rolling step; and
an aging step of performing aging at 400° C. to 500° C. after said solution heat treatment step, wherein
said solution heat treatment step includes: a heating step at 800° C. to 1020° C.; a first quenching step of performing quenching to a temperature range of 550° C. to 750° C. at a cooling speed of 10° C./s or more; a temperature maintaining step of maintaining the 550° C. to 750° C. temperature for 10 seconds to 600 seconds; and a second quenching step of performing quenching to 300° C. or lower after said temperature maintaining step;
in said intermediate annealing step, said heat treatment is continued for 0.1 hours to 20 hours to make conductivity satisfy 40% IACS or more and make Vickers hardness satisfy HV150 or less after said intermediate annealing step.

2. The manufacturing method of the copper alloy sheet according to claim 1 , wherein an average size of crystal grains after said solution heat treatment step is 3 μm to 60 μm.

3. The manufacturing method of the copper alloy sheet according to claim 1 , further comprising:
a finish cold rolling step of performing cold rolling with a 10% to 80% rolling ratio after said aging step.

4. The manufacturing method of the copper alloy sheet according to claim 3 , further comprising:
a low-temperature annealing step of performing heat treatment at 150° C. to 550° C. after said finish cold rolling step.

5. A manufacturing method of a copper alloy sheet comprising:
a melting/casting step of melting and casting a raw material of a copper alloy having a composition consisting of 1.0 mass % to 3.5 mass % Ni, 0.5 mass % to 2.0 mass % Co, and 0.3 mass % to 1.5 mass % Si, at least one of Fe, Cr, Mg, Ti, V, Zr, Sn, Zn, Al, B, P, Ag, Be, and misch metal of 2 mass % or less with a balance being composed of Cu and an unavoidable impurity;
a hot rolling step of performing hot rolling after said melting/casting step;
a first cold rolling step of performing cold rolling after said hot rolling step;
an intermediate annealing step of performing heat treatment at a heating temperature of 500° C. to 650° C. after said first cold rolling step;
a second cold rolling step of performing cold rolling with a rolling ratio of 70% or more after said intermediate annealing step;
a solution heat treatment step of performing solution heat treatment after said second cold rolling step; and
an aging step of performing aging at 400° C. to 500° C. after said solution heat treatment step, wherein
said solution heat treatment step includes: a heating step at 800° C. to 1020° C.; a first quenching step of performing quenching to a temperature range of 550° C. to 750° C. at a cooling speed of 10° C./s or more a temperature maintaining step of maintaining the 550° C. to 750° C. temperature for 10 seconds to 600 seconds; and a second quenching step of performing quenching to 300° C. or lower after said temperature maintaining step;
in said intermediate annealing step, said heat treatment is continued for 0.1 hours to 20 hours to make conductivity satisfy 40% IACS or more and make Vickers hardness satisfy HV150 or less after said intermediate annealing step, and
a mass ratio of Sn is 0.05 mass % or less.

6. The manufacturing method of the copper alloy sheet according to claim 1 , wherein, in the second quenching step, an average cooling speed from the 550° C. to 750° C. temperature down to 300° C. or lower is 50° C./s or more.

Assignees

• Dowa Metaltech Co Ltd

Inventors

• Gao Weilin
• Sugawara Akira
• Miyahara Ryosuke
• Suda Hisashi

Classifications

• C22F1/08

  of copper or alloys based thereon · CPC title

• H01B1/026

  Alloys based on copper · CPC title

• C22C9/10

  with silicon as the next major constituent · CPC title

• C22C9/06 Primary

  with nickel or cobalt as the next major constituent · CPC title