US 2026/0297708 A1 · ALUMINUM ALLOY SHEET AND METHOD FOR PRODUCING ALUMINUM ALLOY SHEET

Abstract

An aluminum alloy sheet includes, by mass %, 0.3% to 1.5% of Si, 0.15% to 0.4% of Fe, 0.001% to 0.2% of Cu, 0.02% to 0.3% of Mn, 0.3% to 0.8% of Mg, 0.001% to 0.3% of Cr, 0.001% to 0.3% of Zn, and 0.001% to 0.3% of Ti with the remainder being Al and impurities. The aluminum alloy sheet has an area fraction of Cube orientation of 17% to 50%. A number density of Mg—Si-based compounds having an equivalent circle diameter of 0.4 μm or more in the aluminum alloy sheet is 2650 particles/mm2 or less, and a number density of Al—Fe—Si-based compounds having an equivalent circle diameter of 2.0 μm or more in the aluminum alloy sheet is 225 particles/mm2 to 700 particles/mm2.

Claims15

Dependent claims

An aluminum alloy sheet comprising:

0.3 mass % to 1.5 mass % of Si;
0.15 mass % to 0.4 mass % of Fe;
0.001 mass % to 0.2 mass % of Cu;
0.02 mass % to 0.3 mass % of Mn;
0.3 mass % to 0.8 mass % of Mg;
0.001 mass % to 0.3 mass % of Cr;
0.001 mass % to 0.3 mass % of Zn;
and
0.001 mass % to 0.3 mass % of Ti,
with the remainder being Al and impurities, wherein
the aluminum alloy sheet has an area fraction of Cube orientation of 17% to 50%,
a number density of Mg—Si-based compounds having an equivalent circle diameter of 0.4 μm or more in the aluminum alloy sheet is 2650 particles/mm2 or less, and
a number density of Al—Fe—Si-based compounds having an equivalent circle diameter of 2.0 μm or more in the aluminum alloy sheet is 225 particles/mm2 to 700 particles/mm2.

10 more elements

A method for producing an aluminum alloy sheet, the method comprising:

in the following order,
a casting step of melting raw materials to obtain a molten metal having a predetermined chemical composition and casting the molten metal into a slab;
a homogenization heat treatment step of subjecting the cast slab to a homogenization heat treatment;
a hot rough rolling step of subjecting the homogenized slab to hot rough rolling to obtain a hot rough rolled sheet;
a hot finish rolling step of subjecting the hot rough rolled sheet to hot finish rolling to obtain a hot finish rolled sheet;
a cold rolling step of subjecting the hot finish rolled sheet to cold rolling to obtain a cold rolled sheet;
and
a solution treatment step of subjecting the cold rolled sheet to a solution treatment, wherein
in the homogenization heat treatment step, the homogenization heat treatment is performed in a temperature range of 520° C. to 580° C.,
no cooling and no additional heat treatment are performed between the homogenization heat treatment step and the hot rough rolling step,
in the hot rough rolling step, a final pass is performed under a condition that a Z factor, as expressed by the following formula, is 1.0×108 to 5.0×1011,
Z
=
ε
.
⁢
exp
⁡
(
Q
/
RT
)
wherein ε′ represents a strain rate, Q represents activation energy, R represents a gas constant, and T represents a temperature,
the hot finish rolling step is performed such that an end temperature is 250° C. or higher and lower than 350° C.,
the cold rolling step is performed such that a cold rolling ratio is 74% to 95%, and
the obtained aluminum alloy sheet contains
0.3 mass % to 1.5 mass % of Si,
0.15 mass % to 0.4 mass % of Fe,
0.001 mass % to 0.2 mass % of Cu,
0.02 mass % to 0.3 mass % of Mn,
0.3 mass % to 0.8 mass % of Mg,
0.001 mass % to 0.3 mass % of Cr,
0.001 mass % to 0.3 mass % of Zn, and
0.001 mass % to 0.3 mass % of Ti,
with the remainder being Al and impurities.

33 more elements

Dependencies are inferred from the claim text.

Aluminum alloy sheet and method for producing aluminum alloy sheet

Life of this patent

Aluminum alloy sheet and method for producing aluminum alloy sheet

Life of this patent

Abstract

Claims15