Special hard aluminum alloys
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Hard Aluminum alloys (Duralumin)
1. What's the Duralumin?
Duralumin (also called duraluminum, duraluminium or dural) is the trade name of one of the earliest types of age-hardenable aluminium alloys.
The main alloying constituents are copper, manganese and magnesium. A commonly used modern equivalent of this alloy type is 2024, which contains (in wt.%) 4.4% copper, 1.5% magnesium, 0.6% manganese and 93.5% aluminium. Typical yield strength is 450 MPa, with variations depending on the composition and temper.
Typical yield strength is 450 MPa, with variations depending on the composition and temper.
Duralumin was developed by the German metallurgist Alfred Wilm at D?rener Metallwerke Aktien Gesellschaft. In 1903, Wilm discovered that after quenching, an aluminium alloy containing 4% copper would slowly harden when left at room temperature for several days.
Further improvements led to the introduction of Duralumin in 1909. The name is obsolete today, and mainly used in popular science to describe the Al-Cu alloy system, or 2000 series as designated by the Aluminum Association.
Its first use was rigid airship frames. Its composition and heat-treatment were a wartime secret. With this new rip-resistant mixture, duralumin quickly spread throughout the aircraft industry in the early 1930s,
where it was well suited to the new monocoque construction techniques that were being introduced at the same time. Duralumin also is popular for use in precision tools such as levels because of its light weight and strength.
Although the addition of copper improves strength, it also makes these alloys susceptible to corrosion. For sheet products, corrosion resistance can be greatly enhanced by metallurgical bonding of a high-purity aluminium surface layer.
These sheets are referred to as alclad, and are commonly used by the aircraft industry.

Physical and mechanical properties of 7075-T6
- Density(Mg/㎥ at 20℃): 2.81
- Melting range: 477~635℃
- Electrical Conductivity: 33 IACS%
- Thermal conductivity: 0.14 KW/(m℃, at 25℃)
- Strength(Typical): Ultimate 570 Mpa , Yield 505 Mpa , Elongation 11% , Shear 315MPa, Fatigue 160 Mpa
- Brinnell Hardness(Typical): HB 150

Application and Products



Alloy Application Temper Products
2011 Volume shaft, Brake piston, Optical products, Automotive products F, T4, T6, T8 Extroduded Rod & Bar
Drawn Rod & Bar
2014
2017
2024
Aerospace, Hydraulic machine parts, Military, Rivet F, O, T3 T351, T4, T6, T851 Extroduded Rod & Bar
Drawn Rod & Bar
Sheet & Plate
2018
2218
Cylinder Head, Piston, VTR Drum O, T61 Extroduded Rod & Bar
2618 Piston, Mold for rubber, Heat-resistant parts F, O, T3511, T8511 Extroduded Rod & Bar
2219 Tank for low temperature, Military, Aerospace T3, T351, T6, T851 Extruded Shape
Sheet & Plate
5052 Vessel, Automotive, Construction, Can end, Honey comb F, O, H32~H38, H112 Extruded Rod, Bar, Tube and Shape
Drawn Rod, Bar, Tube and Shape
Sheet & Plate
5056 Camera parts, Electronics part F, O, H32~H38, H112 Extruded Rod, Bar, Tube and Shape
Drawn Rod, Bar, Tube and Shape
Sheet & Plate
5083 Vessel, Automotive parts, Tanks for low temperature, Pressure tank F, O, H32~H38, H112 Extruded Rod, Bar, Tube and Shape
Drawn Rod, Bar, Tube and Shape
Sheet & Plate
6061 Vessel, Automotive, Machinery, Forging, Material for Mold & Die F, O, T4, T6, T651 Extruded Rod, Bar, Tube and Shape
Drawn Rod, Bar, Tube and Shape
Sheet & Plate
6082 Vessel, Automotive, Machinery, Forging F, O, T4, T6, T651 Extruded Rod, Bar, Tube and Shape
Drawn Rod, Bar, Tube and Shape
Sheet & Plate
6262 Camera parts, Vaporizer, Brake parts, Gas burner parts T6, T651, T9 Extroduded Rod & Bar
Drawn Rod & Bar
7003 Automotive, Motorcycle rim, Wheelchare T5 Extruded Tube and Shape
7050 Aerospace, High speed rotary machine T74, T7452 Extruded Rod, Bar and Shape
Sheet and Plate
7075 Aerospace, Military, Machinery, Sports & leisure, Material for Mold & Die F, O, T6. T651, T6511, T73, T7351 Extruded Rod, Bar, Tube and Shape
Drawn Rod, Bar, Tube and Shape
Sheet & Plate
7N01 Automotive, Motorcycle rim T4, T5, T6 Extruded Rod, Bar, Tube, Shape