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Aluminum alloy extruded product exhibiting excellent surface properties, method of manufacturing the same, heat exchanger multi-port tube, and method of manufacturing heat exchanger including the multi-port tube

  • US 20110114228A1
  • Filed: 01/18/2011
  • Published: 05/19/2011
  • Est. Priority Date: 07/22/2005
  • Status: Abandoned Application
First Claim
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1. A method of manufacturing an aluminum alloy extruded product exhibiting excellent surface properties and with the number of intermettalic compounds having a circle equivalent diameter of 0.1 to 0.9 μ

  • m dispersed in the alloy matrix being at least 2×

    105 per square millimeter, the method comprising;

    melting and casting an aluminum alloy having a composition consisting of, in mass %, 0.8-1.6% of Mn and 0.4-0.8% Si, at a Mn/Si content of 0.7-2.4 and, optionally, 0.2% or less of Mg, 0.30% or less of Ti, 0.05% or less of Cu and 0.7% or less of Fe, with the balance being Al, to obtain an ingot;

    subjecting the ingot to homogenization which includes a first-stage heat treatment in which the ingot is maintained at 550 to 650°

    C. for two hours or more and a second-stage heat treatment in which the ingot is cooled to 400 to 500°

    C. at an average temperature decrease rate of 20 to 60°

    C./h and maintained at that temperature for three hours or more;

    heating the ingot at 480 to 560°

    C.; and

    extruding the ingot.

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