Abstract: An aluminum alloy sheet material, containing 2.6% by mass or more and less than 3.5% by mass (% by mass is simply denoted by % hereinafter) of Si, 0.05 to 0.5% of Mg, 0.5% or more and less than 1.2% of Cu, 0.6 to 1.5% of Mn, 0.5 to 1.6% of Zn, and 0.3 to 2.0% of Fe, and containing, if necessary, at least one of 0.01 to 0.2% of Cr, 0.01 to 0.2% of Zr, 0.01 to 0.2% of V, and 0.01 to 0.2% of Ti, with the balance of Al and unavoidable impurities. A method of producing the aluminum alloy sheet material, which method contains carrying out specific workings.

Abstract: Disclosed is an Al alloy for a welded construction having excellent welding characteristics, which Al alloy comprises 1.5 to 5 wt % of Si (hereinafter, wt % is referred to as %), 0.2 to 1.5% of Mg, 0.2 to 1.5% of Zn, 0.2 to 2% of Cu, 0.1 to 1.5% of Fe, and at least one member selected from the group consisting of 0.01 to 1.0% of Mn, 0.01 to 0.2% of Cr, 0.01 to 0.2% of Ti, 0.01 to 0.2% of Zr, and 0.01 to 0.2% of V, with the balance being Al and inevitable impurities. Also disclosed is a welded joint having this Al alloy base metal welded with an Al—Mg— or Al—Si-series filler metal.

Abstract: Disclosed is an Al alloy for a welded construction having excellent welding characteristics, which Al alloy comprises 1.5 to 5 wt % of Si (hereinafter, wt % is referred to as %), 0.2 to 1.5% of Mg, 0.2 to 1.5% of Zn, 0.2 to 2% of Cu, 0.1 to 1.5% of Fe, and at least one member selected from the group consisting of 0.01 to 1.0% of Mn, 0.01 to 0.2% of Cr, 0.01 to 0.2% of Ti, 0.01 to 0.2% of Zr, and 0.01 to 0.2% of V, with the balance being Al and inevitable impurities. Also disclosed is a welded joint having this Al alloy base metal welded with an Al—Mg- or Al—Si-series filler metal.

Abstract: An aluminum sheet material for automobiles is herein disclosed, having an aluminum alloy composition: (i) comprising 3.5 to 5 wt % of Si, 0.3 to 1.5 wt % of Mg, 0.4 to 1.5 wt % of Zn, 0.4 to 1.5 wt % of Cu, 0.4 to 1.5 wt % of Fe, and 0.6 to 1 wt % of Mn, and one or more members selected from the group of 0.01 to 0.2 wt % of Cr, 0.01 to 0.2 wt % of Ti, 0.01 to 0.2 wt % of Zr, and 0.01 to 0.2 wt % of V, with the balance of aluminum and unavoidable impurities, or (ii) comprising between more than 2.6 wt % and 5 wt % of Si, 0.2 to 1.0 wt % of Mg, 0.2 to 1.5 wt % of Zn, 0.2 to 1.5 wt % of Cu, 0.2 to 1.5 wt % of Fe, and between 0.05 and less than 0.6 wt % of Mn, and one or more members selected from the group of 0.01 to 0.2 wt % of Cr, 0.01 to 0.2 wt % of Ti, 0.01 to 0.2 wt % of Zr, and 0.01 to 0.2 wt % of V, with the balance of aluminum and unavoidable impurities.

Abstract: An aluminum alloy sheet for automotive use is provided which comprises a starting aluminum alloy sheet which has an alloy composition containing from 2 to 6% by weight of Mg, 0.15 to 1.0% by weight of Fe and from 0.03 to 2.0% by weight Mn, and a surface layer disposed over one surface of the starting alloy sheet to be pressed against electrodes for use in welding, the surface layer containing a particulate intermetallic compound has a particle diameter of 0.5 &mgr;m or more and a density of 4,000 pieces of particles per one mm2 or more. The product alloy sheet ensure least deformation of an electrode and stable weldability by means of continuous resistance spot welding.

Abstract: There is disclosed a method of producing an aluminum alloy for automotive parts, comprising adding a scrap of an aluminum wrought alloy or a pure aluminum ingot to an aluminum alloy casting scrap, melting the mixture to dilute impurities, and if necessary, adjusting elements of the resultant. According to the above method, aluminum alloy casting scraps, which contain large amounts of impurities and have been difficult to recycle into other articles until now, can be converted to an aluminum alloy material that is applicable as a wrought material usable as a higher-grade material.

Abstract: An aluminum sheet material for automobiles is herein disclosed, having an aluminum alloy composition: (i) comprising 3.5 to 5 wt % of Si, 0.3 to 1.5 wt % of Mg, 0.4 to 1.5 wt % of Zn, 0.4 to 1.5 wt % of Cu, 0.4 to 1.5 wt % of Fe, and 0.6 to 1 wt % of Mn, and one or more members selected from the group of 0.01 to 0.2 wt % of Cr, 0.01 to 0.2 wt % of Ti, 0.01 to 0.2 wt % of Zr, and 0.01 to 0.2 wt % of V, with the balance of aluminum and unavoidable impurities, or (ii) comprising between more than 2.6 wt % and 5 wt % of Si, 0.2 to 1.0 wt % of Mg, 0.2 to 1.5 wt % of Zn, 0.2 to 1.5 wt % of Cu, 0.2 to 1.5 wt % of Fe, and between 0.05 and less than 0.6 wt % of Mn, and one or more members selected from the group of 0.01 to 0.2 wt % of Cr, 0.01 to 0.2 wt % of Ti, 0.01 to 0.2 wt % of Zr, and 0.01 to 0.2 wt % of V, with the balance of aluminum and unavoidable impurities.

Abstract: An aluminum alloy extruded material for automotive structural members, which contains 2.6 to 5 wt % of Si, 0.15 to 0.3 wt % of Mg, 0.3 to 2 wt % of Cu, 0.05 to 1 wt % of Mn, 0.2 to 1.5 wt % of Fe, 0.2 to 2.5 wt % of Zn, 0.005 to 0.1 wt % of Cr, and 0.005 to 0.05 wt % of Ti, and satisfies relationship of the following expression (I), (Content of Mn (wt %))+0.32×(content of Fe (wt %))+0.097×(content of Si (wt %))+3.5×(content of Cr (wt %))+2.9×(content of Ti (wt %))≦1.36 (I) with the balance being made of aluminum and unavoidable impurities. A method of producing the aluminum alloy extruded material for automotive structural members, which comprises cooling with a refrigerant from outside of a die-exit side, at the time of extrusion.

Abstract: A continuously cast and rolled sheet of an aluminum alloy having Mg in a content of 3 to 6% by weight is annealed, followed by strain correction, heat and hold treatment at a given temperature between 240° C. and 340° C. for one hour or more, and slowly cooling treatment, to thereby provide an aluminum alloy sheet having enhanced resistance to stress corrosion cracking and improved shape fixability. The slowly cooling treatment is carried out at a cooling rate chosen from a preset cooling zone corresponding to a present temperature zone S defined in obliquely lined surround form in the accompanying drawing.

Abstract: The invention provides an aluminum alloy sheet that has excellent formability, high coat-baking hardenability, excellent corrosion resistance, and is particularly suitable for external automobile body plates. The aluminum alloy sheet comprises: 0.9 to 1.3 wt. % of Si, 0.4 to 0.6 wt. % of Mg, 0.05 to 0.15 wt. % of Mn, 0.01 to 0.1 wt. % of Ti, with the remainder comprising Al and inevitable impurities, while limiting Fe as an impurity to 0.2 wt. % or less and Cu as an impurity to 0.1 wt. % or less. The aluminum homogenizing an aluminum ingot with the above-described composition; cooling the homogenized ingot to a temperature of 450.degree. C. or below to begin hot-rolling; finishing hot-rolling in a temperature range from 250 to 350.degree. C.; applying intermediate annealing to the hot-rolled plate; conducting cold-rolling at a draft of 70% or more; applying a solid solution treatment followed by quenching the alloy sheet and holding it at 530.degree. C. or above for 60 sec.

Abstract: The invention provides an aluminum alloy sheet that has excellent formability, high coat-baking hardenability, and ensures a proof stress of 200 MPa or more after the coat-baking stage, and that gives favorable product surface quality after the forming stage and excellent corrosion resistance, and that is particularly suitable for external automobile body plates. The aluminum alloy sheet comprises: 0.9 to 1.3 wt. % of Si, 0.4 to 0.6 wt. % of Mg, 0.05 to 0.15 wt. % of Mn, 0.01 to 0.1 wt. % of Ti, with the remainder comprising Al and inevitable impurities, while limiting Fe as an impurity to 0.2 wt. % or less and Cu as an impurity to 0.1 wt. % or less; a coating film of a lubricant composition containing a water-dispersible polyurethane resin and a natural wax on the aluminum alloy sheet.