Material Substitution

High-Strength Aluminum Sheets as an Alternative to Stainless Steel Thin Plates

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For the frames of mobile devices, etc.

UACJ provides high-strength, lightweight aluminum alloy sheets for use with smartphones, notebook PCs and other mobile devices. As an alternative to stainless steel thin plates, which are often used in such devices, UACJ's sheets have equivalent strength while offering the unique advantages of aluminum, including being fully nonmagnetic.

Advantages of Replacement with Aluminum High-strength Sheet

  • High-strength GM55-H38 is ideal as an alternative to 0.3mmt stainless steel components.
  • It has a strong track record of use with mobile phone frames and LCD components.
  • Aluminum is nonmagnetic and has no effect on GPS.

Issues When Considering Replacement with Aluminum High-strength Sheet

  • As the technology for bonding with ABS plastic, laser welding on aluminum is problematic compared with SUS304.
  • As a result, for complex shapes requiring an increase in thickness at the boss, rib, etc., the use of aluminum is growing by means of methods such as plastic bonding and Nano Molding Technology (NMT).

Properties comparison of materials

Material Specific gravity Strength
(N/㎜2)
Specific strength
(strength/specific gravity)
Aluminum
(1050-H24)
2.7 125 46
Aluminum
(5052-H34)
2.7 240 89
Aluminum
(GM55-H38)
2.7 400 148
Magnesium
(AZ91 Die-cast)
1.80 230 127
Copper 8.90 343 39
Steel 7.85 412 52
Stainless steel
SUS304H
7.90 834 106
Titanium 4.5 392 87
Material Strength/weight Formability Appearance Productivity Price
Aluminum
(alumite)
Magnesium × × ×
Stainless steel △–
(hairline)
Titanium × × ×

UACJ's aluminum alloys for electronic products

  Material properties Temper Tensile strength
(N/mm2)
Yield strength
(N/mm2)
Elongation
(%)
Bend
0.5mmt
Features
  GM55 H18 430 370 8 1 Strongest in 5000 series
Shallow drawing also possible with H38
Good alumite properties
H38 400 310 12 0
High-strength H34 350 250 15 0
  O 290 130 33 0
GC150 H38 390 310 10 1 High-strength, suited to internal structures
Strong yellow-black color when alumite
Ultra-deep-drawing possible with O
H32 is for lightweight drives
H34 350 250 15 0
H32 330 240 18 0
O 290 135 32 0
GM345
(5182)
H38 380 310 8 1 Thin-plate, high-strength standard H36
Good alumite properties
Enhancement of former GM145 bendability
H36 360 270 10 0.5
H34 335 250 13 0
O 265 125 28 0
6061 T6 310 250 18 0.5 Quenched sheet in Motorola mobiles
GF24
552S
(5052 strength)
H36 275 235 8 1 552S is an alumite-optimized version of the 5052 standard
Little streaking and yellowness after 552S alumite.
GF24 has the same strength as 5052 without Cr
5052 component non-standard
No yellowness
  H34 240 190 12 0.5
  H32 210 180 13 0
0 190 90 25 0
B152S
(5252)

H34 210 190 10 0.5 Gloss HB, strength equivalent to 5052
Good alumite and chemical polishing properties
  H32 210 180 12 0
257S H24 145 115 12 1 Gloss LF/HB, good chemical polishing properties
For mirror finishing
  0 100 40 33 0
Pleasing gloss appearance 1050 H24 125 115 20 0 Standard housing material 0.8mmt