Method for producing aluminum alloy clad material

Patent metadata

Field	Value
Publication number	US-11408690-B2
Application number	US-201916459585-A
Country	US
Kind code	B2
Filing date	Jul 1, 2019
Priority date	Jul 29, 2013
Publication date	Aug 9, 2022
Grant date	Aug 9, 2022

Abstract

A method for producing an aluminum alloy clad material having a core material and a sacrificial anode material clad on at least one surface of the core material, wherein the core material comprises an aluminum alloy comprising 0.050 to 1.5 mass % (referred to as “%” below) Si, 0.050 to 2.0% Fe and 0.50 to 2.00% Mn; the sacrificial anode material includes an aluminum alloy containing 0.50 to 8.00% Zn, 0.05 to 1.50% Si and 0.050 to 2.00% Fe; the grain size of the sacrificial anode material is 60 μm or more; and a ratio R1/R2 is 0.30 or less, wherein R1 (μm) is a grain size in a thickness direction and R2 (μm) is a grain size in a rolling direction in a cross section of the core material along the rolling direction; a production method thereof; and a heat exchanger using the clad.

First claim

The invention claimed is:

1. A method for producing an aluminum alloy clad material having an aluminum alloy core material and a sacrificial anode material clad on at least one surface of the core material, comprising:
a step of casting the aluminum alloys for the core material and the sacrificial anode material, respectively,
a hot rolling step of hot rolling a cast sacrificial anode material ingot to a predetermined thickness,
a cladding step of cladding the sacrificial anode material rolled to the predetermined thickness on at least one surface of a core material ingot obtained by casting the aluminum alloy for the core material and thus obtaining a clad material,
a hot clad rolling step of hot rolling the clad material,
a cold rolling step of cold rolling the hot-rolled clad material, and
one or more annealing steps of annealing the clad material either during or after the cold rolling step or both during and after the cold rolling step:
wherein in the hot clad rolling step, the rolling start temperature is 400 to 520° C., and the number of rolling passes each with a rolling reduction of 30% or more is restricted to one to five while the temperature of the clad material is 200 to 400° C., and
the clad material is held at 200 to 560° C. for 1 to 10 hours in the annealing step(s),
wherein the core material comprises an aluminum alloy comprising 0.05 to 1.50 mass % Si, 0.05 to 2.00 mass % Fe, 0.50 to 2.00 mass % Mn and a balance of Al and unavoidable impurities based on a total mass of the core material,
the sacrificial anode material comprises an aluminum alloy comprising 0.50 to 8.00 mass % Zn, 0.05 to 1.50 mass % Si, 0.05 to 2.00 mass % Fe and a balance of Al and unavoidable impurities based on a total mass of the sacrificial anode material,
a grain size of the sacrificial anode material is 60 vim or more, and
a ratio R 1 /R 2 is 0.30 or less, when R 1 (μm) is a grain size in a thickness direction and R 2 (μm) is a grain size in a rolling direction in a cross section of the core material along the rolling direction.

Assignees

• Uacj Corp

Inventors

• Ando Makoto
• Fukumoto Atsushi
• Niikura Akio

Classifications

• C22C21/14

  with silicon · CPC title

• F28F19/06 Primary

  of metal · CPC title

• B23K2101/14

  Heat exchangers · CPC title

• B23K35/286

  Al as the principal constituent · CPC title

• F28F21/089

  Coatings, claddings or bonding layers made from metals or metal alloys (F28F19/06 takes precedence) · CPC title