7000 Series aluminum: 101

Part One: What is 7000 Series aluminum?

About 7000 Series Aluminum

7000 series aluminum belongs to the Al-Zn-Mg-Cu system of super-hard aluminum. This alloy number has been used in the aircraft manufacturing industry since the late 1940s and is still widely used in the aviation industry. The representative aluminum grade 7075 mainly contains zinc elements. 7075 aluminum plate is stress relieved, will not be deformed and warped after processing. It has good plasticity after solid solution treatment, especially good heat treatment strengthening effect, high strength below 150℃, and has particularly good low-temperature strength. 7 series aluminum sheet is a series of 8 aluminum plate series with better performance, representing a higher level of the current aluminum plate production process. 7 series aluminum sheet as a cold treatment forging alloy, its strength and As a cold treatment forging alloy, the strength, and hardness of 7 series aluminum sheet is much better than the general steel.


The characteristics of 7000 series aluminum

  1. High strength. 7 series aluminum plate’s more significant feature is its strength, zinc and magnesium elements formed by the MgZn2 structure have an obvious strengthening effect so that the 7 series aluminum plate heat treatment effect is far better than other aluminum plates. With the increase of zinc and magnesium content, the strength of the aluminum plate will be further improved.
  2. Good mechanical properties. 7 series aluminum plate mechanical properties, because the internal crystal is meticulous, uniform distribution, so 7 series aluminum plate has super wear resistance, its depth drilling performance is also second to none.
  3. Strong corrosion resistance. 7 series aluminum sheet has good resistance to stress corrosion and spalling corrosion, excellent performance in the processing of high-stress structural parts.
  4. High low-temperature strength. 7 series aluminum sheet has good low-temperature performance, especially when the temperature is below 150℃, the performance is better.


1.Can 7000 series aluminum be welded? Can you weld 7075 aluminum?

7000 aluminum sheet can be welded. Because of its strong brittleness and high strength requirements after welding, so generally use the conventional 5183 weldings. If after welding still produces cracks or short use of the phenomenon, then the use of WEWELDING53 high strength low-temperature aluminum wire welding. But the use of welding with argon arc welding, because the zinc content is relatively high, in the welding process there is a smoke phenomenon this is normal. So you need to add 53 welding wire to the molten pool inside, to quickly move forward, if this action can not keep up, it is easy to add into the molten pool inside the 53 welding layer will be burned. Because of zinc burn will produce some ash layer, so after welding need to use stainless steel small brushes to continue to follow up.


2.What’s the highest grade of aluminum? What is the highest strength aluminum alloy?

Among many materials, aluminum alloy is the kind of material that is both environmentally friendly and economical. We are often asked which aluminum is the hardest? We all know that aluminum alloy is divided into pure aluminum, alloy aluminum plate, hard aluminum, die-casting aluminum, and so on. Among these aluminum alloys, 7075-T651 is the best aluminum material, which is used for high quality, high performance, and high strength processing materials. Aluminum alloy 7075-T6 has the strongest tensile strength among aluminum alloys and is the strongest hardness among 7 series aluminum alloys, with a hardness of 150HB. Nowadays, it is generally used in aerospace, automobile manufacturing, and shipbuilding.


3.7000 aluminum stronger than steel? Is aluminum harder than mild steel? Can aluminum be as strong as steel?

The addition of Zinc and Magnesium elements can improve the strength of the 7 series aluminum plate. But with the increase of zinc and magnesium elements, the stress corrosion resistance and spalling corrosion resistance of the 7 Series aluminum plate will also be reduced. 7 series aluminum plate has low welding performance and is not suitable for welding processing. 7075 aluminum plate is the representative grade of 7 series aluminum plate, which can be called a stronger commercial aluminum plate. The strength of 7075-T651 is stronger than that of soft steel and is known as a better product in aluminum alloy.


4.What is 7000 aluminum used for? / 7000 Series aluminum uses

7075 aluminum used for: Since the 1950s, the 7000 series aluminum sheet has been widely used in the aviation industry and is still an essential material for manufacturing aircraft. Mainly used in: aerospace industry, blow molding (bottle) mold, ultrasonic plastic welding mold, golf head, shoe mold, paper, and plastic mold, mechanical equipment, mold processing, used to make high-end aluminum alloy bicycle frame. It was first used as the body material of smartphone OPPO N3 in 2014.


5.Can 7075 aluminum be cast?

7075 aluminum alloy is cast, and the form of the cast aluminum alloy is plate or bar, but after the casting, the processing is mainly cutting processing.

Part Two: 7000 Series Aluminum Sheet

7 Series aluminum plate is mainly zinc, but sometimes magnesium and copper are added in small amounts. One of the super-hard aluminum alloys is the one containing zinc, lead, magnesium, and copper alloy close to the hardness of the steel plate. The extrusion speed is slower than 6-series alloys, and the welding performance is good. Grades 7050 and 7075 are the highest grade of 7 series aluminum plate, which can be heat-treated and strengthened.


Aluminum Plate 7075: used for aircraft parts, gears, instrument shafts, mold-making turbines, keys, aircraft, aviation, and national defense, etc. Structural parts that seek high strength and strong corrosion resistance. 7075 aluminum sheet thickness from 1.0mm to 300mm.


Aluminum Plate 7005: extruded material, used in the manufacture of both high strength and high fracture toughness of welded structures, such as transportation vehicles trusses, rods, containers; large heat exchangers, as well as welding after the parts can not be solid-fusion treatment; can also be used in the manufacture of sports equipment such as tennis rackets and softball bats.


Aluminum Plate 7039: Refrigeration containers, cryogenic instruments, and storage boxes, fire fighting pressure equipment, military equipment, armor plates, missile devices.


Aluminum Plate 7050: Medium-thick plates, extrusions, free forgings and die forgings for aircraft structural parts. The manufacture of such parts of the alloy requirements are: resistance to spalling corrosion, stress corrosion cracking ability, fracture toughness, and fatigue resistance is high


Aluminum Plate 7A04: Aircraft skins, screws, and stressed components such as beam trusses, spacers, wing ribs, landing gear, etc.


Part Three: 7075 T651 Aluminum Sheet

The most representative grade of the 7000 series aluminum sheet is 7075, which is a super hard aluminum alloy with good wear resistance. The main alloying element of the pre-stretched 7075-T651 aluminum sheet is zinc, and magnesium can be added to form an alloy with a significant strengthening effect. After heat treatment, the alloy can achieve very high strength. Aluminum plate 7075-T651 is treated with internal stress relief, precision machining without deformation, a very high-quality alloy with high strength, good mechanical properties, and anodic reaction. Pre-drawn 7075 aluminum plate has higher hardness than other aluminum, it is high strength heat treatable alloy.


Applications of pre-drawn 7075 aluminum sheet

7075 T651 aluminum plate mainly used in aerospace, mold processing, machinery and equipment, jigs and fixtures, especially for the manufacture of aircraft structures and other products requiring high strength and corrosion resistance in high-stress structures. 7075 aluminum used on iPhone 6s / 6 Plus, also used on the Apple Watch Sport. Compared to stainless steel materials, the weight can be reduced by up to 30% while providing the same strength. Therefore it will feel better in your hand than a regular phone.


7075 aluminum material property data

TemperAnti –tensile strength N/m㎡Elongation rate(%)surfaceHardness
7075 T6580Mpa 11Black / BrightAbove 160HB
7075 T651595Mpa 14Black / BrightAbove 160HB


Aluminum alloy 7075 Plate Latest Price


Can 7075 aluminum be anodized?

7075 aluminum rod, 7075 aluminum plate, and other processed aluminum alloy parts to do anodized is more difficult than other grades of aluminum alloy parts, such as 6061 aluminum plate, 5052 aluminum plate, 6063 aluminum plate, and other processed aluminum parts easier to do anodic oxidation, and 7075 material aluminum parts to do anodic oxidation and unstable, only suitable for anodized into aluminum alloy natural color and black. If you want to oxidize into red, yellow, green, and other bright colors will produce a very high rate of bad. Mainly because the 7075 aluminum alloy contains a large number of zinc elements, zinc is the most influential chemical element on the oxidation effect, its easy 7075 aluminum plate alloy processing parts in doing anodic oxidation when a variety of undesirable phenomena.


1. Whats the difference between 6061 and 7075 aluminum? Is 6061 or 7075 aluminum stronger? 7000 series aluminum vs 6061

6061 is a 6000 series aluminum, mainly with magnesium and silicon as the main alloy. The aluminum alloy element accounts for 97.9%, the magnesium element accounts for 1%, and the silicon element accounts for 0.6%. In addition, 0.28% of copper and 0.2% of chromium are added. It is usually used in the following states: 6061-O, 6061-T6, 6061-T651, 6061-T5.


The composition of the 7075 aluminum casting T651 plate consists of roughly 5.6-6.1% zinc, 2.1-2.5% magnesium, and 1.2-1.6% copper. It is usually used in the following states: 7075-O, 7075-T6, 7075-T651.


The 6061 material can be used in various places where the aluminum alloy is not required, such as automobile parts and molds; while 7075 and 7005 are usually used in aerospace, commercial applications with high hardness and low-density requirements, so 7075 usually becomes a commercial aluminum alloy.


The price of 6061 is generally 2.8$/KGS – 4.5$/KGS, while the 7075 series aluminum price is generally 4.8$/KGS – 9$/KGS; therefore, the sales of 6061 are relatively high, while the sales of 7075 are less than 6061 because of the price.


The tensile strength of the 6061 T6 aluminum sheet is 35KSI and the yield strength is 31KSI; while the tensile strength of 7075-T6 is 83KSI and yield strength is 73KSI.


Comparison of 6061 and 7075 properties  

Alloy NumberTensile StrengthYield Strength% of ElongHardnessFatigue Strength


2.What’s the difference between 7050 and 7075 aluminum? 7075 VS 7050

7050 aluminum alloy is based on 7075 aluminum alloy, but the Zn and Cu content is increased and Cr is replaced by Zr to overcome the quenching sensitivity problem and inhibit recrystallization, which has higher strength, fracture toughness, and stress corrosion resistance.


7075 aluminum alloy: 7075 is one of the strongest aluminum alloys for commercial use. 7075 aluminum alloy has a tight structure and strong corrosion resistance and is best for aviation and marine plates. General corrosion resistance, good mechanical properties, and anodic reaction. Fine grains make better depth drilling performance, tool wear resistance is enhanced, and thread rolling is more distinctive. 7075 aluminum alloy tensile strength 524Mpa, yield strength 455Mpa: elongation 11%, modulus of elasticity E/Gpa: 71, hardness 150HB, density: 2810.


7075 aluminum price is almost the same as Aluminum 7050 price.

Part Four: 7000 series Aluminum Bar

7075 Aluminum Bar

7075 aluminum alloy bar processing characteristics: the 7075-T6 aluminum round bar is known as ultra-high-strength aluminum alloy, the yield strength of the alloy is close to the tensile strength, yield ratio is high, strength ratio is also very high, but plasticity and high-temperature strength is the bottom, suitable for normal temperature 120 ℃ below the use of load-bearing structural parts, the alloy is easy to process, have good corrosion resistance and high toughness. The 7075 aluminum round bar is widely used in the field of aviation and aerospace and has become one of the most important structural materials in this field.

Alloy: 7075-T7351, 7075-T6, 7075-T651

Density: 2.90g/cm³

Tensile strength: O state: 152MPa (22ksi); T6, T7451 state: 331MPa (48ksi).

Hardness: O state: 60HB; T6,T651 state: 150HB.


7050 Aluminum Bar

7050 aluminum rod is a high-strength heat treatable alloy, aerospace super-hard aluminum alloy, high strength, good wear resistance, has very high strength and resistance to spalling corrosion and stress corrosion fracture performance. It is commonly used in aircraft structural parts, extruded parts for medium and thick plates, free forging parts, and die forging parts.

Density: 2.90g/cm³.

Tensile strength: O state: 152MPa (22ksi); T6, T7451 state: 331MPa (48ksi).

Hardness: O state: 60HB; T6,T7451 state: 150HB.


7A04 aluminum bar

7A04 aluminum rod is an ultra-high-strength aluminum alloy of Al-Zn-Mg-Cu system, also known as super-hard aluminum, which is quite mature in super-hard aluminum. It is a long-used and widely used alloy. It has high strength, good heat treatment strengthening effect, medium plasticity in the annealed and newly quenched state; unlike hard aluminum, the corrosion resistance in the artificial aging state is better than that in the natural aging state, and the natural aging process is slow, it takes 3 months to reach the peak of aging hardening. So 7A04 is used in the quenched artificial aging state.

Density: 2.90g/cm³.

Tensile strength: O state: 152MPa (22ksi); T6, T651 state: 331MPa (48ksi)

Hardness: O state: 60HB; T6,T651 state: 150HB


7A09 aluminum bar

7A09 aluminum rod is a super hard aluminum of Al-Zn-Mg-Cu system. This alloy has been used in aircraft manufacturing since the late 1940s and is still widely used in the aviation industry. It needs to be used by aluminum cladding or other protective treatment. Double aging can improve the alloy’s ability to resist stress corrosion cracking. The plasticity in the annealed and freshly quenched state is slightly lower than 2A12 in the same state and slightly better than 7A04. Notch sensitive, stress corrosion performance is better than 7A04.

Density: 2.90g/cm³.

Tensile strength: O state: 152MPa (22ksi); T6, T7451 state: 331MPa (48ksi).

Hardness: O state: 60HB; T6,T651 state: 150HB.



7000 Series aluminum includes 7000 Series aluminum sheet, 7000 Series extrusion profile, and 7000 Series aluminum bar. The representative grade 7075 is an aluminum alloy sheet with zinc as the main alloying element and is a heat treatable reinforced aluminum alloy. When magnesium is added to the alloy, it is an Al-Zn-Mg alloy. The alloy has good heat deformation performance, a wide quenching range, and can obtain high strength under appropriate heat treatment conditions.

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