Title:
FREE-CUTTING ALUMINUM ALLOY EXTRUDED MATERIAL HAVING REDUCED SURFACE ROUGHNESS AND EXCELLENT PRODUCTIVITY
Document Type and Number:
WIPO Patent Application WO/2015/030121
Kind Code:
A1
Abstract:
The purpose of the present invention is to produce an Al-Mg-Si-based aluminum alloy extruded material that does not undergo seizure and has a smooth surface without deteriorating the productivity of the extruded material.
An aluminum alloy billet is subjected to such a homogenization treatment that the billet is retained at 500 to 550˚C for 4 to 15 hours, the resultant product is forcibly cooled to a temperature of 250˚C or lower at an average cooling rate of 50˚C/hour or more, the cooled product is heated to 450 to 500˚C, the heated product is subjected to a hot extrusion procedure at an extrusion rate of 3 to 10 m/min, the resultant extruded material is forcibly cooled at an average cooling rate of 50˚C/second or more, and the cooled product is subjected to an aging treatment, wherein the aluminum alloy billet contains 2.0 to 6.0 mass% of Si, 0.3 to 1.2 mass% of Mg and 0.01 to 0.2 of Ti and also contains Fe in an amount of 0.2 mass% or less, with the remainder made up by Al and unavoidable impurities. In this manner, an extruded material of which the surface has a ten-point average roughness (Rz) of 80 μm or less can be produced.
Inventors:
MIYATA YUKIMASA
YOSHIHARA SHINJI
SHIKAMA TAKAHIRO
YOSHIHARA SHINJI
SHIKAMA TAKAHIRO
Application Number:
PCT/JP2014/072592
Publication Date:
March 05, 2015
Filing Date:
August 28, 2014
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
International Classes:
C22C21/02; B21C23/00; B21C29/00; C22F1/043; C22F1/00
Foreign References:
| JPH108175A | 1998-01-13 | |||
| JP2002047525A | 2002-02-15 |
Other References:
"edited by 40 Shunen Kinen Jigyo Jikko Iinkai Kinen Shuppan Bukai", ALUMINIUM NO SOSHIKI TO SEISHITSU, 30 November 1991 (1991-11-30), pages 287 - 289
Attorney, Agent or Firm:
SAMEJIMA, Mutsumi et al. (JP)
Mutsumi Sameshima (JP)
Mutsumi Sameshima (JP)
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