Aluminum alloy plate having excellent moldability and bake hardening properties

Patent metadata

Field	Value
Publication number	US-2018187293-A1
Application number	US-201515128281-A
Country	US
Kind code	A1
Filing date	Mar 23, 2015
Priority date	Mar 31, 2014
Publication date	Jul 5, 2018
Grant date	—

Abstract

The purpose of the present invention is to provide an aluminum alloy plate capable of having a 0.2% proof stress during molding of no more than 110 MPa and a 0.2% proof stress after BH of at least 170 MPa. The present invention pertains to an aluminum alloy plate including, in mass %, 0.2%-1.0% Mg and 0.2%-1.0% Si, fulfilling {(Mg content)+(Si content)}≤1.2%, having a 20-50 μW/mg high exothermic peak within a temperature range of 230-330° C. in a differential scanning calorimetry curve, and having both excellent moldability and excellent bake hardening properties.

First claim

1 . An aluminum alloy sheet excellent in terms of formability and bake hardenability, which is an Al—Mg—Si alloy sheet comprising, in terms of mass %, Mg: 0.2-1.0% and Si: 0.2-1.0% and satisfying {(Mg content)+(Si content)}≤1.2%, with the remainder being Al and unavoidable impurities,
wherein a differential scanning thermal analysis curve of the aluminum alloy sheet has, in a temperature range of 230-330° C., only one exothermic peak (i) or only two exothermic peaks (ii) having a temperature difference between the peaks of 50° C. or less, and
wherein the exothermic peak (i) or the peak having a higher peak height of the exothermic peaks (ii) has a height in a range of 20-50 μW/mg.

2 . The aluminum alloy sheet excellent in terms of formability and bake hardenability according to claim 1 , further comprising one element or two or more elements selected from the group consisting of Fe: more than 0% and 0.5% or less, Mn: more than 0% and 0.3% or less, Cr: more than 0% and 0.3% or less, Zr: more than 0% and 0.1% or less, V: more than 0% and 0.1% or less, Ti: more than 0% and 0.1% or less, Cu: more than 0% and 0.5% or less, Ag: more than 0% and 0.1% or less, and Zn: more than 0% and 0.5% or less.

Assignees

• Kobe Steel Ltd

Inventors

• Shishido Hisao
• Matsumoto Katsushi
• Aruga Yasuhiro

Classifications

• C22C21/02 Primary

  with silicon as the next major constituent · CPC title

• C22F1/05

  of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions · CPC title

• C22C21/08

  with silicon · CPC title

• C22C21/06

  with magnesium as the next major constituent · CPC title

• C22F1/047

  of alloys with magnesium as the next major constituent · CPC title