Aluminum alloy pipe-shaped hollow material and piping material for heat exchanger

Patent metadata

Field	Value
Publication number	US-11220728-B2
Application number	US-201816619536-A
Country	US
Kind code	B2
Filing date	May 28, 2018
Priority date	Jun 7, 2017
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

An aluminum alloy pipe-shaped hollow material is produced by porthole extrusion. The aluminum alloy pipe-shaped hollow material includes an Al—Mg-based alloy containing Mg of 0.7 mass % or more and less than 2.5 mass %, and Ti of more than 0 mass % and 0.15 mass % or less, with the balance being Al and unavoidable impurities. A work hardening coefficient n-value is 0.25 or more and less than 0.43. The aluminum alloy pipe-shaped hollow material has an inner-surface ridged structure inside thereof, and an area ratio of the inner-surface ridged structure in a cross-section orthogonal to an extending direction of the aluminum alloy pipe-shaped hollow material is 1 to 30%. The present invention can provide an aluminum alloy pipe-shaped hollow material that is an aluminum alloy pipe-shaped hollow material of a 5000 series aluminum alloy produced by porthole extrusion and has excellent bending processability.

First claim

The invention claimed is:

1. An aluminum alloy pipe-shaped hollow material produced by porthole extrusion, the aluminum alloy pipe-shaped hollow material comprising an Al—Mg-based alloy containing Mg of 0.7 mass % or more and less than 2.5 mass %, and Ti of more than 0 mass % and 0.15 mass % or less, with the balance being Al and unavoidable impurities, wherein
a work hardening coefficient n-value is 0.25 or more and less than 0.43, and
the aluminum alloy pipe-shaped hollow material having a pipe portion, a longitudinal axis, a hollow portion, and a ridged structure or partition portion formed on an inner surface of the pipe portion, the pipe portion being a base for the ridged structure or partition portion, the ridged structure or the partition portion having an area (B) measured in cross-section orthogonal to the longitudinal axis, the hollow portion having an area (A) defined by the formula π×(D I /2) 2 where D I is an inner diameter of the pipe-shaped hollow material measured in cross-section orthogonal to the longitudinal axis, an area ratio percentage of (B)/(A)×100 being between 1% and 30%.

2. The aluminum alloy pipe-shaped hollow material according to claim 1 , wherein the area ratio percentage is between 4% and 30%.

3. A piping material for a heat exchanger, the piping material being a product formed with the aluminum alloy pipe-shaped hollow material according to claim 1 .

Assignees

• Uacj Corp
• Uacj Extrusion Corp

Inventors

• Suzuki Taichi
• Yamashita Naoki

Classifications

• C22C21/06 Primary

  with magnesium as the next major constituent · CPC title

• F28F21/084

  from aluminium or aluminium alloys · CPC title

• F28F2255/16

  extruded · CPC title

• C22C21/00

  Alloys based on aluminium · CPC title

• Y10T428/12292

  Workpiece with longitudinal passageway or stopweld material [e.g., for tubular stock, etc.] · CPC title