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  1. 1. Alloy designations Wrought and cast aluminium alloys use different identification systems. Wrought aluminium is identified with a four digit number which identifies the alloying elements, followed by a dash, a letter identifying the type of heat treatment and a 1 to 4 digit number identifying the specific temper, e.g. 6061-T6, the most common free-machining aluminium alloy. Cast aluminium alloys use a four to five digit number with a decimal point. The digit in the hundred's place indicates the alloying elements, while the digit after the decimal point indicates the form (cast shape or ingot) Wrought alloys The International Alloy Designation System is the most widely accepted naming scheme for wrought alloys. Each alloy is given a four-digit number, where the first digit indicates the major alloying elements. 1000 series are essentially pure aluminium with a minimum 99% aluminium content by weight and can be work hardened 2000 series are alloyed with copper, can be precipitation hardened to strengths comparable to steel. Formerly referred to as duralumin, they were once the most common aerospace alloys, but were susceptible to stress corrosion cracking and are increasingly replaced by 7000 series in new designs. 3000 series are alloyed with manganese, and can be work-hardened 4000 series are alloyed with silicon. They are also known as silumin 5000 series are alloyed with magnesium, derive most of their strength from solution hardening, and can also be work hardened to strengths comparable to steel 6000 series are alloyed with magnesium and silicon, are easy to machine, and can be precipitation-hardened, but not to the high strengths that 2000, 5000 and 7000 can reach. 7000 series are alloyed with zinc, and can be precipitation hardened to the highest strengths of any aluminium alloy. 8000 series are a miscellaneous category Wrought aluminum alloy composition limits (% weight) Other Alloy Si Fe Cu Mn Mg Cr Zn V Ti Bi Ga Pb Zr Al each total 1060 0.25 0.35 0.05 0.03 0.03 0.03 0.05 0.05 0.03 0.03 0.03 0.03 0.03 0.03 99.6 min 1100 0.95 Si+Fe 0.05-0.20 0.05 0.1 0.05 0.15 99.0 min 2014 0.50-1.2 0.7 3.9-5.0 0.40-1.2 0.20-0.8 0.1 0.25 0.15 0.05 0.15 remainder 2024 0.5 0.5 3.8-4.9 0.30-0.9 1.2-1.8 0.1 0.25 0.15 0.05 0.15 remainder 2219 0.2 0.3 5.8-6.8 0.20-0.40 0.02 0.1 0.05-0.15 0.02-0.10 0.10-0.25 0.05 0.15 remainder 3003 0.6 0.7 0.05-0.20 1.0-1.5 0.1 0.05 0.15 remainder 3004 0.3 0.7 0.25 1.0-1.5 0.8-1.3 0.25 0.05 0.15 remainder 3102 0.4 0.7 0.1 0.05-0.40 0.3 0.1 0.05 0.15 remainder 4043 4.5-6.0 0.8 0.3 0.05 0.05 0.1 0.2 0.05 0.15 remainder 5052 0.25 0.4 0.1 0.1 2.2-2.8 0.15-0.35 0.1 0.05 0.15 remainder 5083 0.4 0.4 0.1 0.40-1.0 4.0-4.9 0.05-0.25 0.25 0.15 0.05 0.15 remainder 5086 0.4 0.5 0.1 0.20-0.7 3.5-4.5 0.05-0.25 0.25 0.15 0.05 0.15 remainder 5154 0.25 0.4 0.1 0.1 3.10-3.90 0.15-0.35 0.2 0.2 0.05 0.15 remainder 5356 0.25 0.4 0.1 0.1 4.50-5.50 0.05-0.20 0.1 0.06-0.20 0.05 0.15 remainder 5454 0.25 0.4 0.1 0.50-1.0 2.4-3.0 0.05-0.20 0.25 0.2 0.05 0.15 remainder 5456 0.25 0.4 0.1 0.50-1.0 4.7-5.5 0.05-0.20 0.25 0.2 0.05 0.15 remainder 6005 0.6-0.9 0.35 0.1 0.1 0.40-0.6 0.1 0.1 0.1 0.05 0.15 remainder 6005A† 0.50-0.9 0.35 0.3 0.5 0.40-0.7 0.3 0.2 0.1 0.05 0.15 remainder 6060 0.30-0.6 0.10-0.30 0.1 0.1 0.35-0.6 0.5 0.15 0.1 0.05 0.15 remainder 6061 0.40-0.8 0.7 0.15-0.40 0.15 0.8-1.2 0.04-0.35 0.25 0.15 0.05 0.15 remainder 6063 0.20-0.6 0.35 0.1 0.1 0.45-0.9 0.1 0.1 0.1 0.05 0.15 remainder 6066 0.9-1.8 0.5 0.7-1.2 0.6-1.1 0.8-1.4 0.4 0.25 0.2 0.05 0.15 remainder 6070 1.0-1.7 0.5 0.15-0.40 0.40-1.0 0.50-1.2 0.1 0.25 0.15 0.05 0.15 remainder 6082 0.7-1.3 0.5 0.1 0.40-1.0 0.60-1.2 0.25 0.2 0.1 0.05 0.15 remainder 6105 0.6-1.0 0.35 0.1 0.1 0.45-0.8 0.1 0.1 0.1 0.05 0.15 remainder 6162 0.40-0.8 0.5 0.2 0.1 0.7-1.1 0.1 0.25 0.1 0.05 0.15 remainder 6262 0.40-0.8 0.7 0.15-0.40 0.15 0.8-1.2 0.04-0.14 0.25 0.15 0.40-0.7 0.40-0.7 0.05 0.15 remainder 6351 0.7-1.3 0.5 0.1 0.40-0.8 0.40-0.8 0.2 0.2 0.05 0.15 remainder 6463 0.20-0.6 0.15 0.2 0.05 0.45-0.9 0.05 0.05 0.15 remainder 7005 0.35 0.4 0.1 0.20-0.7 1.0-1.8 0.06-0.20 4.0-5.0 0.01-0.06 0.08-0.20 0.05 0.15 remainder 7072 0.7 Si+Fe 0.1 0.1 0.1 0.8-1.3 0.05 0.15 remainder 7075 0.4 0.5 1.2-2.0 0.3 2.1-2.9 0.18-0.28 5.1-6.1 0.2 0.05 0.15 remainder 7116 0.15 0.3 0.50-1.1 0.05 0.8-1.4 4.2-5.2 0.05 0.05 0.03 0.05 0.15 remainder 7129 0.15 0.3 0.50-0.9 0.1 1.3-2.0 0.1 4.2-5.2 0.05 0.05 0.03 0.05 0.15 remainder 7178 0.4 0.5 1.6-2.4 0.3 2.4-3.1 0.18-0.28 6.3-7.3 0.2 0.05 0.15 remainder † Manganese plus chromium must be between 0.12-0.50%. The "other" limits apply to all elements, whether a table column exists for them or not, for which no other limit is specified.
  2. 2. Cast alloys The Aluminium Association (AA) has adopted a nomenclature similar to that of wrought alloys. British Standard and DIN have different designations. In the AA system, the second two digits reveal the minimum percentage of aluminium, e.g. 150.x correspond to a minimum of 99.50% aluminium. The digit after the decimal point takes a value of 0 or 1, denoting casting and ingot respectively.[4] The main alloying elements in the AA system are as follows: 1xx.x series are minimum 99% aluminium 2xx.x series copper 3xx.x series silicon, copper and/or magnesium 4xx.x series silicon 5xx.x series magnesium 7xx.x series zinc 8xx.x series tin 9xx.x series miscellaneous Named alloys Duralumin (copper, aluminium) Magnox (magnesium, aluminium) Silumin (aluminium, silicon) Common aerospace alloys These are aluminium alloys which have a long history of being used in aircraft and other aerospace structures. 7075 aluminium 6061 aluminium 6063 aluminium 2024 aluminium 5052 aluminium Other aerospace alloys These are currently produced, but less widely used, aluminium alloys for aerospace applications. 2090 aluminium 2124 aluminium 2195 aluminium - Al-Li alloy, used in Space Shuttle Super Lightweight external tank 2219 aluminium 2324 aluminium 6013 aluminium 7050 aluminium 7055 aluminium 7150 aluminium 7475 aluminium Marine alloys These alloys are used for boat building and shipbuilding, and other marine and salt-water sensitive shore applications. 5052 aluminium 5083 aluminium 5086 aluminium 6061 aluminium 6063 aluminium Common automotive alloys These are aluminium alloys which are used extensively for body panels in the automotive industry. 6111 aluminium
  3. 3. Alloy designations Wrought aluminum alloy composition limits (% weight) Other Alloy Si Fe Cu Mn Mg Cr Zn V Ti Bi Ga Pb Zr Al each total 1060 0.25 0.35 0.05 0.03 0.03 0.03 0.05 0.05 0.03 0.03 0.03 0.03 0.03 0.03 99.6 min 1100 0.95 Si+Fe 0.05-0.20 0.05 0.1 0.05 0.15 99.0 min 2014 0.50-1.2 0.7 3.9-5.0 0.40-1.2 0.20-0.8 0.1 0.25 0.15 0.05 0.15 remainder 2024 0.5 0.5 3.8-4.9 0.30-0.9 1.2-1.8 0.1 0.25 0.15 0.05 0.15 remainder 2219 0.2 0.3 5.8-6.8 0.20-0.40 0.02 0.1 0.05-0.15 0.02-0.10 0.10-0.25 0.05 0.15 remainder 3003 0.6 0.7 0.05-0.20 1.0-1.5 0.1 0.05 0.15 remainder 3004 0.3 0.7 0.25 1.0-1.5 0.8-1.3 0.25 0.05 0.15 remainder 3102 0.4 0.7 0.1 0.05-0.40 0.3 0.1 0.05 0.15 remainder 4043 4.5-6.0 0.8 0.3 0.05 0.05 0.1 0.2 0.05 0.15 remainder 5052 0.25 0.4 0.1 0.1 2.2-2.8 0.15-0.35 0.1 0.05 0.15 remainder 5083 0.4 0.4 0.1 0.40-1.0 4.0-4.9 0.05-0.25 0.25 0.15 0.05 0.15 remainder 5086 0.4 0.5 0.1 0.20-0.7 3.5-4.5 0.05-0.25 0.25 0.15 0.05 0.15 remainder 5154 0.25 0.4 0.1 0.1 3.10-3.90 0.15-0.35 0.2 0.2 0.05 0.15 remainder 5356 0.25 0.4 0.1 0.1 4.50-5.50 0.05-0.20 0.1 0.06-0.20 0.05 0.15 remainder 5454 0.25 0.4 0.1 0.50-1.0 2.4-3.0 0.05-0.20 0.25 0.2 0.05 0.15 remainder 5456 0.25 0.4 0.1 0.50-1.0 4.7-5.5 0.05-0.20 0.25 0.2 0.05 0.15 remainder 6005 0.6-0.9 0.35 0.1 0.1 0.40-0.6 0.1 0.1 0.1 0.05 0.15 remainder 6005A† 0.50-0.9 0.35 0.3 0.5 0.40-0.7 0.3 0.2 0.1 0.05 0.15 remainder 6060 0.30-0.6 0.10-0.30 0.1 0.1 0.35-0.6 0.5 0.15 0.1 0.05 0.15 remainder 6061 0.40-0.8 0.7 0.15-0.40 0.15 0.8-1.2 0.04-0.35 0.25 0.15 0.05 0.15 remainder 6063 0.20-0.6 0.35 0.1 0.1 0.45-0.9 0.1 0.1 0.1 0.05 0.15 remainder 6066 0.9-1.8 0.5 0.7-1.2 0.6-1.1 0.8-1.4 0.4 0.25 0.2 0.05 0.15 remainder 6070 1.0-1.7 0.5 0.15-0.40 0.40-1.0 0.50-1.2 0.1 0.25 0.15 0.05 0.15 remainder 6082 0.7-1.3 0.5 0.1 0.40-1.0 0.60-1.2 0.25 0.2 0.1 0.05 0.15 remainder 6105 0.6-1.0 0.35 0.1 0.1 0.45-0.8 0.1 0.1 0.1 0.05 0.15 remainder 6162 0.40-0.8 0.5 0.2 0.1 0.7-1.1 0.1 0.25 0.1 0.05 0.15 remainder 6262 0.40-0.8 0.7 0.15-0.40 0.15 0.8-1.2 0.04-0.14 0.25 0.15 0.40-0.7 0.40-0.7 0.05 0.15 remainder 6351 0.7-1.3 0.5 0.1 0.40-0.8 0.40-0.8 0.2 0.2 0.05 0.15 remainder 6463 0.20-0.6 0.15 0.2 0.05 0.45-0.9 0.05 0.05 0.15 remainder 7005 0.35 0.4 0.1 0.20-0.7 1.0-1.8 0.06-0.20 4.0-5.0 0.01-0.06 0.08-0.20 0.05 0.15 remainder 7072 0.7 Si+Fe 0.1 0.1 0.1 0.8-1.3 0.05 0.15 remainder 7075 0.4 0.5 1.2-2.0 0.3 2.1-2.9 0.18-0.28 5.1-6.1 0.2 0.05 0.15 remainder 7116 0.15 0.3 0.50-1.1 0.05 0.8-1.4 4.2-5.2 0.05 0.05 0.03 0.05 0.15 remainder 7129 0.15 0.3 0.50-0.9 0.1 1.3-2.0 0.1 4.2-5.2 0.05 0.05 0.03 0.05 0.15 remainder 7178 0.4 0.5 1.6-2.4 0.3 2.4-3.1 0.18-0.28 6.3-7.3 0.2 0.05 0.15 remainder Manganese plus chromium must be between 0.12-0.50%. † The "other" limits apply to all elements, whether a table column exists for them or not, for which no other limit is specified.

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