Automobiles

Aluminum Alloy Sheets for Automobile Panels

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For inner and outer panels

アルミニウムブレージングシート（BR材）の写真

UACJ supplies a variety of lightweight aluminum alloy sheets equipped with the strength, formability, corrosion resistance and surface quality demanded for automobile panels.

6000 Series Alloys

Features

  • Alloy sheet for body panels features excellent formability and displays high strength after coat-baking.
  • High BH type alloys are recommended where dent resistance is regarded as critical.
  • High formability type alloys are recommended where the formability is regarded as critical.

Properties

Mechanical properties: types and mechanical properties (sheet thickness: 1 mm)

Alloy designation AA*1 Tensile strength
(N/mm2)		 Proof stress
(N/mm2)		 Elongation
(%)		 Proof stress (after baking)*2
(N/mm2)		 Remarks
SG712-T4 （6116） 240 130 28 205 High BH type
SG212-T4 high formability type （6116） 245 135 30 170 High formability type
TM30-T4 （6005） 210 110 27 190 High hemmability type
TM66-T4 （6111） 240 115 29 210 High formability type, high BH type

*1 AA: The Aluminum Association (U.S.A.); numbers show the equivalent alloys.

*2 Baking conditions: After applying 2% pre-distortion, test value after 20 minutes at 170°C.

Formability (sheet thickness: 1 mm)

Alloy designation Formability Hemmability Corrosion resistance BH effect Ridging resistance
SG712-T4 〇 〇 〇 〇 〇
SG712-T4 high formability type 〇＋ 〇 〇 △ 〇
TM30-T4 〇 〇＋ 〇 〇 〇
TM66-T4 〇＋＋ 〇 △ 〇 〇

* standard △ ⇒ 〇 ⇒ 〇+ ⇒ 〇++

Hemmability

Ordinary body sheet

Breaks in adhesion bending, but can manage with at hemming.

High-hemmability sheet

Can be subjected to sharp bending, which is more problematic than at hemming.

Bake hardenability

Alloy designation 2% pre-distortion + 20 min at 170°C
Tensile strength
(N/mm2)		 Proof stress
(N/mm2)		 Elongation
(%)
SG712-T4 285 205 23
SG712-T4 high formability type 275 170 23
TM30-T4 270 190 22
TM66-T4 285 210 24

5000 Series Alloys

Features

  • Alloys with high strength and excellent formability equal to that of cold rolled steel.
  • GC45 is an alloy featuring low coat-baking proof stress reduction.

Properties

Mechanical properties: types and mechanical properties (sheet thickness: 1 mm)

Alloy designation AA*1 Tensile strength
(N/mm2)		 Proof stress
(N/mm2)		 Elongation
(%)		 n value*2 r value
GC45-O 5022 280 130 28 0.31 0.70
GM145-O 5182 275 135 27 0.33 0.55
52S-O 5052 195 90 25 0.26 0.70

*1 AA: The Aluminum Association (U.S.A.)

*2 Average value from 2% to the maximum load

Formability: types and formability (sheet thickness: 1 mm)

Alloy designation Formability Hemmability Corrosion resistance SS mark resistance
GC45-O ◎＋ ◎ 〇 〇
GM145-O ◎ ◎ 〇 △
52S-O 〇 ◎ 〇 △

* standard △ ⇒ 〇 ⇒ 〇+ ⇒ ◎ ⇒ ◎+