Aluminium Alloy

Aluminium Alloy and Its Importance

  • Aluminium Sheet
  • Aluminium Bar
  • Aluminium Round bar
  • Aluminium Flat bar
  • Aluminium Square / Hex bar
  • Aluminium Plate
  • Aluminium Tread Plate / Chequered Plate
  • Aluminium Square tube
  • Aluminium Round tube
  • Aluminium Rectangular tube
  • Aluminium Angle
  • Aluminium Channel
  • Aluminium Tee sections
  • Aluminium customized Profile
  • Aluminium Forgings
  • Aluminium Seamless Tube
  • Aluminum Drawn Products
  • Aluminium Architectural / Building profile

Aluminium Alloy and Its Importance
Pure aluminium is soft and ductile and most commercial uses require greater strength than pure aluminium affords. So strength is achieved by the addition of other elements to produce alloys. Further strengthening is possible by means which classify the alloys roughly into two categories, non-heat-treatable and heat treatable.

NON-HEAT-TREATABLE ALLOYS
The strength of alloys in this group depends upon the hardening effect of elements such as manganese, silicon, iron and magnesium. Since these alloys are work-hardenable, strength levels are controlled by various degrees of cold working, denoted by the ‘H’ series of tempers. Alloys containing appreciable amounts of magnesium when supplied in strain-hardened tempers are usually given a final elevated-temperature treatment called stabilizing to ensure stability of properties

1050/1080/1200
Commercially pure aluminium, highly resistant to chemical attack and weathering. Easily worked and welded, but the lowest strength aluminium. Excellent for chemical processing equipment and other uses where product purity is important, and for metal pressings of all types where ductility is critical also , it is a Soft workable alloys having high purity which gives excellent corrosion resistant.

3003/3103
1% Mag Alloy, Stronger than 1200 with same good formability. Fine corrosion resistant and good weldability. Used for storage tanks, chemical equipment, brazing applications, van bodies and cryogenic uses. For higher strength, consider 5251 or 5052.

5251/5052
Far stronger than either of the above alloys. Forms readily in the intermediate tempers. Corrosion resistant is very good as is weldability. Better salt water corrosion resistant than 1200. Used for pressure vessels, tanks, fittings or applications involving forming or welding where strength higher than 3003 is needed. Also houseboat hulls, pontoon boats and van bodies.

5086
Excellent for welded structures – strip hulls and superstructures, road tankers, pressure vessels, movable and stationery cryogenic vessels and structures requiring a high rate of energy absorption. Restricted to temperatures below 150°F = 65.5°C.

5454
For all types of welded structures. ASME code approved for temperatures up to 400?C = 204.4?C. Used for hot asphalt road tankers, dump bodies, pressures vessels and marine structures.

1350
Electrical purity aluminium with conductivity of 61.5% for the international Annealed Copper Standard. For similar current and temperature rise conditions a conductor in this alloy weighs 46% of a copper conductor. It is obviously used principally as in electrical bus bar where low resistivity is a critical requirement. The electrical quality alloy not often found in the rolled form, normally rolled to special requirements.

5005
Specified for anodized applications to match with 6063 extrusions. Anodized coating is clearer and lighter than for 3003 / 3103 in severe drawing applications. Uses are decorative, architectural and consumer products.

5083
Stronger than either of the above alloys. For high strength welded applications with outstanding joint strength – rail wagons, marine components, bridges, stationery cryogenic vessels and overhead cranes. Excellent weldability and corrosion resistant. Static welded strength is second only to 5754 and 5083 is superior to 5754 in energy absorption. Restricted to temperature below 150°C = 65.5°C. The widest range of plate from stock

5154
Similarly to 5083 which has largely superseded it, mainly used on MOD and naval applications

5754
Similar to 5454 which has largely superseded it because of superior stress corrosion characteristics.

HEAT-TREATABLE ALLOYS
The strength of alloy in this group is enhanced by the addition of alloying elements such as copper, magnesium, zinc and silicon. Since this elements show increasing solid solubility in aluminium with increasing temperature, thermal treatments imparts pronounced strengthening. The first step, called solution heat treatment, is an elevated - temperature process designed to put the soluble element or elements in solid solution. This is followed by rapid quenching, usually in water, which momentarily ‘freezes’ the structure and for a short time renders the alloy very workable. It is at this stage that some fabricators retain this more workable structure by storing the alloys at below freezing temperatures until they are ready to form them. At room or elevated temperature the alloys are not stable after quenching, and precipitation of the constituents from the super – saturated solution begins. After a period of several days at room temperature, termed ageing or room temperature precipitation, the alloy is considerably stronger. Many alloys approach a stable condition at room temperature, but some alloys, particularly those containing magnesium and silicon or magnesium and zinc, continue to age – harden for long periods of time at room temperature. By heating for a controlled time at slightly elevated temperatures, further strengthening is possible and properties are stabilized. This process is called artificial ageing or precipitation hardening. By the proper combination of solution heat treatment, quenching, cold working and artificial ageing, the highest strengths are obtained.

2011
The Free Machining Alloy – Machines to an excellent finish. Often replaces free machining brass without a change of tooling. First choice for screw machined parts unless higher strength or more corrosion resistance is required. Contains lead and bismuth to produce fine chips. Typical parts are clock gears, nozzles, pipe items, spindles.

6063
Low to medium strength alloy suitable for more intricate sections requiring good corrosion resistance and high surface finish. Used in transport and all architectural applications where good anodizing characteristics are essential. The most common alloy for shape from stock.

6101A
the best combination of mechanical and electrical properties, 55% for this international Annealed Copper Standard. See comments on 1350. Normally in bar form.

7075
A very high strength aircraft alloy. Good machinability and hardness. Not for welding and corrosion resistant.

2014/2024
High strength alloys with excellent machinability widely used in aircraft. Have limited formability and only fair corrosion resistant in the heat treated condition. Not recommended for fusion welding. Used for high strength parts in aircraft and machinery, including gears and bolts and for security vans where strength ids critical. It has a tendency to allow the removal of a greater volume of metal in a single operation for an equipment standard of finish than 6082. Durability, however, is lower and needs a protection coating. Machines better in solution treated condition than fully heat treated. Used for machined parts where these characteristics are critical.

6082/6061
Widely used structural alloys for light to medium strength applications. Combine good formability, weldability, brazed with fine finishing characteristics and good corrosion resistance and strength after heat treatment. Since they lose appreciable strength when welded, the 5000 series alloys replace them in some marine applications. Availability of bars, shapes, tubing and pipe in the same alloy helps make this a popular selection. 6082 is the most common heat treated plate from stock. 6061 is similar to 6802 with better formability but more difficult to extrude and possessing lower strength. Used for couplings, hardware, hydraulic pistons, etc.

7020
A medium to high strength alloy with good machining and welding characteristics used in general engineering, aerospace and defence applications.

ANNEALING
All aluminium alloys are available in annealed form. It may be desirable to anneal an alloy from any other initial temper, after working, or between stages of working such as in deep drawing.

MOULD PLATE
Mould plate is a rolled tooling plate. This is generally made for rolling mills house specifications. It is not as stable as cast tooling plate but gives much better life in highly machined components. Its porosity free characteristics make it ideal plastic injection moulds. Most commonly used in the 100mm to 250mm thickness range, but some mills can produce up to 400mm thick

TOOLING PLATE
Cast -
A continuous cast plate machined both sides to about 25 microinch finish and thermally stress relieved. Has best thickness tolerance of any aluminium plate plus maximum stability. Excellent for precision applications such electronic base or mounting plates, photos vacuum plates, checking fixtures. Has a good welding, anodizing and corrosion resistant property. No forming. Usually used in the 6mm to 30mm thickness range, but also available up to 150mm
Rolled -
A continuous cast plate machined both sides to about 25 microinch finish and thermally stress relieved. Has best thickness tolerance of any aluminium plate plus maximum stability. Excellent for precision applications such electronic base or mounting plates, photos vacuum plates, checking fixtures. Has a good welding, anodizing and corrosion resistant property. No forming. Usually used in the 6mm to 30mm thickness range, but also available up to 150mm
5558 -
A specialist aluminium alloy rolled plate specifically designed for tooling applications particularly in machine beds or jigs. This alloy has all the characteristics of 5083 in welding, polishing and anodizing but has the machinability of 6082. Full range of thicknesses from 6mm to 300mm is available.

* This data is for reference purpose only

ROLLED PRODUCTS

SHEET

COIL

PLATE

BUILDING (ROOFING) SHEET

TREAD / CHEQURED/FLOORING SHEET & PLATE

STUCO SHEET & COIL

CLOSURE STOCK

FOIL

CLOSURE / FIN STOCK

EXTRUDED PRODUCTS

ROD

FLAT BAR

SQAURE BAR

HEX BAR

ROUND TUBE

SQAURE TUBE

RECTANGULAR TUBE

ANGLE

CHANNEL

I BEAM

T SECTION

OVAL TUBE

TRANPORT PROFILE

ARCHITECTURAL /BUILDING PFOFILE

BUS BAR & TUBULAR

HEAT SINK

INDUSTRIAL PROFILE

CUSTOMISE/SPECIAL PROFILE

FORGED PRODUCT

SEAMLESS TUBE

DRAWN PRODUCT

HOW ALLOYING ELEMENTS AFFECT ALUMINIUM

Series

Main Alloy

Effect on Alloying Elements

1000

Non (99% Alum.)

Unalloyed aluminium is highly corrosion resistant, low strength, workable, conductive, Non-heat-treatable.

2000

Copper Based

Gives strength, hardness, machinability, Heat-treatable

3000

Manganese Based

Adds moderate strength, good workability. Non-heat-treatable

5000

Magnesium Based

Moderate to high strength. Corrosion resistant. Non-heat-treatable

6000

Magnesium & Silicon Based

Increase strength, formability, corrosion resistant. Heat-treatable.

7000

Zinc Based

For greatest strength. Heat-treatable.

Note : 1000, 3000, 5000 and 6000 alloys have good welding characteristics and corrosion resistant. 2000 and 7000 alloys have higher strength and better machinability, but lower weldability and corrosion resistant.

WROUGHT ALLOYS: NEAR EQUIVALENT DESIGNATION

INDIA

U.S.A.

BRITAIN

CANADA

GERMANY

RUSSIA

I.S.O.

FRENCH

New IS

Old IS

(A.A.)

(B.S.)

(DIN)

-

-

-

19501

1E

1050(E.C.)

1E

C 1S

E-Al 99.5

-

Al-99.5

1050A

19500

1B

1050

1B

1S

A-99.5

-

-

-

19600

-

1060

-

-

-

-

Al-99.7

-

19700

-

1070

-

-

Al-99.7

-

Al-99.8

-

19800

1A

1080

1A

-

-

-

Al-99.0

1200

19000

1C

1100

1C

2S

Al-99.0

AD

Al-Cu-6 Bi Pb

2011

-

-

2011

FC1

28S

Al-Cu-Bi-Pb

-

-

-

24345

H15

2014

H15

B26S

Al-Cu-Si

AK

Al-Cu-4Mg Si

-

24534

H14

2017

H14

17S/16S

-

D1

Al-Cu-4Mg 1

2024

-

-

2024

-

24S

Al-Cu-Mg.2

-

AlCu-4PbMg

2030

-

-

2030

-

-

Al-Cu-Mg-Pb

-

Al-Cu2-Mg1.5-Ni

2618

-

-

2618

2618

-

-

-

A-Mn 1

3003

31000

N3

3003

N3

3S

Al-Mn

A-Mn

Al Mn 1 Mg 1

3004

-

-

3004

-

Al-Mn.1-Mg.1

Al Mn 1 Mg 0.50

3005

-

-

3005

-

Al-Mn.1-Mg.0.50

Al-Si5

4043

43000

N21

4043

N21

33S

Al-Si-5

AK

-

-

46000

N2

4047

N2

35S

-

-

A-Mg-1

-

51000

-

5005

-

B57S

-

-

Al-Mg-2

5251

5051

5251

Al-Mg.2 Mn.0.30

A-Mg-2.5

5051

52000

N4

5052

N4

M57S

Al-Mg.2

A-Mg

A-Mg-4

-

53000

N5

5086

N5

54S

-

A-Mg-3

Al-Mg-4.5 Mn

5083

54300

N8

5083

N8

D54S

Al-Mg-4.5 Mn

-

Al-Mg.5

5356

55000

N6

5056

N6

A56S

Al-Mg.5

-

Al-Mg.3-Mn

5454

5454

5454

Al-Mg.2.7-Mn

-

Al.Mg.3

5754

5754

Al-Mg.3

Al-Mg-1Si Cu

-

65032

H20

6061

H20

65S

Al-Mg-Si Cu

-

Al-Mg-Si

-

63400

H9

6063

H9

50S

Al-Mg-Si 0.5

-

Al-Si-1 Mg

6081

64430

H30

6351

H30

B51S

Al-Mg-Si 1

AV

Al-Si-1 Mg Mn

6082

6082

6082

Al-Mg-Si 1

-

-

-

64423

H11

6066

H11

C62S

-

-

-

62400

-

6005

-

C51S

-

-

-

-

63401

91E

6101

91E

D50S

E.Al.Mg.Si 0.5

-

-

-

64401

-

6201

-

-

-

-

-

-

-

7020

7020

-

-

-

7020

74530

-

7039

-

D74S

-

-

3004

-

-

7075

DTD-5124

75S

-

Al-Zn 6 Mg Cu

7075

40800

8011

-

Al-Fe-Si

8011

WROUGHT ALLOYS: CHEMICAL COMPOSITION LIMITS (PER CENT)

ALLOY
(ISS)

EQUIVALENT
ALLOY (A.A.)

COPPER

MAGNESIUM

SILICON

IRON

MANGANESE

*OTHERS
(TOTAL)

REMARKS

OLD

NEW

U. S. A.

MIN.

MAX.

MIN.

MAX.

MIN.

MAX.

MAX.

MIN,

MAX.

MAX.

1 C

19000

1100

-

0.10

-

-

-

0.5

0.6

-

0.1

0.1

Aluminium 99.0% Min.

-

-

1200

-

0.05

-

-

-

Si+Fe 1.0

-

-

0.05

0.1

Aluminium 99.0% Min.

1 B

19500

1050

-

0.05

-

-

-

0.25

0.4

-

0.05

0.1

Aluminium 99.5% Min.

1 E

19501

-

-

0.04

-

-

-

0.15

0.35

-

0.03

0.1

Aluminium 99.5% Min.

-

19600

1060

-

0.05

-

-

-

0.25

0.35

-

0.03

0.1

Aluminium 99.6% Min.

H 15

24345

2014

3.8

5.0

0.2

0.8

0.5

1.2

0.7

0.3

1.2

0.5

-

H 14

24534

2017

3.5

4.7

0.4

1.2

0.2

0.7

0.7

0.4

1.2

0.5

-

-

-

2024

3.8

4.9

1.2

1.8

-

0.5

0.5

0.3

0.9

0.15

Zn 0.25

N 3

31000

3003

-

0.1

-

0.1

-

0.6

0.7

1.0

1.5

0.4

-

N 4

52000

5052

-

0.1

1.7

2.6

-

0.6

0.5

-

0.5

0.4

Cr + Mn = 0.5

N 5

53000

5086

-

0.1

2.8

4.0

-

0.6

0.5

-

0.5

0.4

Cr + Mn = 0.5

N 8

54300

5083

-

0.1

4.0

4.9

-

0.4

0.7

0.5

1.0

0.4

Chromium up to 0.25

H 20

65032

-

0.15

0.4

0.7

1.2

0.4

0.8

0.7

0.2

0.8

0.4

**Cr = 0.15 - 0.35

-

-

6061

0.15

0.4

0.8

1.2

0.4

0.8

0.7

-

0.15

0.4

Chromium 0.04 to 0.35

H 9

63400

6063

-

0.1

0.4

0.9

0.3

0.7

0.6

-

0.3

0.4

-

-

-

6066

0.7

1.2

0.8

1.4

0.9

1.8

0.7

0.6

1.1

0.4

-

-

64423

-

0.5

1.0

0.5

1.3

0.7

1.3

0.8

-

1.0

-

-

9 1E

63401

6101

-

0.05

0.4

0.9

0.3

0.7

0.5

-

0.03

0.1

-

H 30

64430

6351

-

0.1

0.4

1.2

0.6

1.3

0.6

0.4

1.0

0.3

-

-

-

6082

-

0.1

0.6

1.2

0.7

1.3

0.5

0.4

1.0

0.3

Chromium up to 0.25



-



-



7010



1.5



2.0



2.1



2.6



-



0.12



0.15



-



0.1



-

Zn 5.7 - 6.7
Cr 0.05
Zr 0.11 - 0.17

-

-

7018

-

0.2

1.2

1.4

-

0.35

0.4

0.05

0.5

0.15

Zn 3.5 - 4.5

-

-

7020

-

0.2

1.0

1.4

-

0.35

0.4

0.05

0.5

-

Zn 4.00 - 5.00
Cr 0.10 - 0.35
Zr 0.08 - 0.20

-

-

7150

1.9

2.5

2.0

2.7

-

0.4

0.15

-

0.1

-

Zn 5.1 - 6.1
Zr 0.08 - 0.15
Cr 0.18 - 0.28

-

-

7175

1.2

2.0

2.1

2.9

-

0.15

0.2

-

0.1

-

Zn 5.1 - 6.1
Cr 0.18 - 0.28

-

-

7475

1.2

1.9

1.9

2.6

-

0.1

0.12

-

0.06

-

Zn 5.2 - 6.2
Cr 0.18 - 0.25

*Titanium and / or other grain refining elements

**Either Mn or Cr shall be present

* This data is for reference purpose only