Kobe Steel, Ltd.

Takayuki Kitano

Kazuhisa Fujisawa

Manabu Nakai

Hiroki Sawada

Kenji Osumi

High strength and high toughness aluminum alloy forgings having, as a whole, a strength at &sgr; of 315 N/mm or more and an impact shock value of 20 J/cm or more, wherein the aluminum alloy material contains Mg: 0.6-1.6%, Si: 0.8-1.8%, Cu: 0.1-1.0%, Fe: 0.30% or less, one or more of Mn: 0.15-0.6%, Cr: 0.1-0.2% and Zr: 0.1-0.2%, and the balance of Al and inevitable impurities, wherein the volume fraction of total constituents phase particles (Mg Si and Al&mdash;Fe&mdash;Si&mdash;(Mn, Cr, Zr) series intermetallic compounds) in the aluminum alloy structure in the forgings is 1.5% or less per unit area.

High strength aluminum alloy forgings

A method for refining molten Al alloy and a non-halogen based flux for refining molten Al alloy which make it possible to perform refining such as removal of gas and inclusions at a high reduction level, and are free from a problem that the flux remains in the molten Al alloy, wherein a refining flux is injected into molten Al alloy obtained by melting an Al raw material to refine the melt, thereafter, the resultant is supplied to a mold, so as to cast the Al alloy. At this time, alum is used as the refining flux.

Growing community of inventors

Shimonoseki, Japan

Takayuki Kitano