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ISO/TR 15608 Material Group 23.1

Material Group 23.1 ISO/TR 15608: Heat treatable aluminium-magnesiumsilicon alloys.

EN AW-6061 is a typical alloy in this Al-Mg-Si alloy material group. Generally Al-Mg-Si alloys are precipitation-hardened aluminium alloys. They are commonly available in pre-tempered grades such as 6061-T4/T6 with specified yield strength Rp0,2 > 240 MPa (T6).

The most common temper heat treatment (description in EN 515) for 6061 aluminium is:
T4: Naturally aged to a stable condition
T6: Solution heat treated, quenched and artificially aged

Welding of EN AW-6061 alloy.

Welding of The materials are good weldable with the conventional processes (MIG and TIG). When heat treatable aluminium welded, they lose significant amount of their mechanical properties in the heat affected zone (HAZ). If the base metal being welded is in T4 temper, much of the original strength can be recovered after welding by proper post-ageing. If the base metal is welded in the T6- temper, it can be solution heat treated an aged after welding which will restore it to the T6-temper. However, an post weld heat treating an aging may sous additional problems.

EN AW-6061 alloy , the strength of the original T4 or T6 tempers is reduced in the HAZ due the over-heating. Full re-hardening would require a complete solution heat treatment followed by quenching and artificial aging; as result, the welded assembly will most likely be strongly distorted. Partial re-hardening after weldings is possible up to about 40% of the parent strength.
Therefore, it is recommended,

  • to keep the energy input per unit length of weld as small as possible( to reduce width of HAZ)
  • to weld AlMgSi alloys in the T4 temper followed by age hardening of the complete assembly (if possible).

Applications for : Piping and high pressure gas storage cylinders. According to EN 602, the use of the EN AW-6061 material is allowed for the contact with food.

Name / GradeNumberStandardProductsRemarks
EN AW-AlMgSi
EN AW-AlMgSi
EN AW-6060
EN AW-6060
EN 754
EN 755
Cold drawn rod/bar and tube
Extruded rod/bar, tube
EN 13445-8: No
EN 13480-8: Yes
EN AW-AlMg1SiCu
EN AW-AlMg1SiCu
EN AW-AlMg1SiCu
EN AW-6061
EN AW-6061
EN AW-6061
EN 485
EN 754
EN 755
Plate, sheet, stripe
Cold drawn rod/bar and tube
Extruded rod/bar, tube
EN 13445-8: No
EN 13480-8: Yes
EN AW-AlSi1MgMn
EN AW-AlSi1MgMn
EN AW-6082
EN AW-6082
EN 754
EN 755
Cold drawn rod/bar and tube
Extruded rod/bar, tube
EN 13445-8: No
EN 13480-8: No
6061
6061
6061
6061
6061
6061
6061
6061
6061
WP6061
6061
A96061
A96061
A96061
A96061
A96061
A96061
A96061
A96061
A96061
A96061
A96061
ASTM B-209
ASTM B-210
ASTM B-211
ASTM B-221
ASTM B-234
ASTM B-241
ASTM B-247
ASTM B-308
ASTM B-345
ASTM B-361
ASTM B-547
Plate & sheet
Smls. tube
Bar & rod
Bar & rod & shape
Smls. tube
Smls. pipe & tube
Forgings
Shape
Smls. pipe & tube
Fittings
Welded tube
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
6063
6063
6063
6063
WP6063
A96063
A96063
A96063
A96063
A96063
ASTM B-210
ASTM B-211
ASTM B-241
ASTM B-345
ASTM B-361
Smls. tube
Bar & rod
Smls. pipe & tube
Smls. pipe & tube
Fittings
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
Table: Typical materials