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ISO/TR 15608 Material Group 23.2

Material Group 23.2 ISO/TR 15608: Heat treatable aluminium-zinc-magnesium alloys.

7000 series are alloyed with zinc, and can be precipitation hardened to the highest strengths of any aluminium alloys. Most 7000 series alloys include magnesium and copper as well.

Features of EN AW-7020 alloy

EN AW-7020 is a typical alloy (Cu-free) in this Al-Zc-Mg alloy material group. Generally Al-Zc alloys are precipitation-hardened aluminium alloys. They are commonly available in pre-tempered grades such as 7020-T6 with specified yield strength Rp0,2 > 290 MPa (T6).

The most common temper heat treatment (description in EN 515) for 7020 aluminium is:
T4: Naturally aged to a stable condition
T6: Solution heat treated, quenched and artificially aged

EN AW-7020 material is weldable by standard techniques. The alloy exhibits a good recovery of mechanical properties after welding, approaching the original values of the base metal (depending on welding conditions). These properties can be achieved after natural aging for a prolonged period or after an additional artificial aging treatment.

In Al-Zn-Mg alloys(Cu-free) , strength in the heat effect zone (HAZ) is reduce due to the re-solution of the precipitates. In this case, natural or preferred weldable EN AW-7020 offers unique possibilities due to

  • large solid solution range from 350-500°C
  • low quench rate sensitivity
  • significant age-hardening effect at room temperature

The HAZ reaches the original strength after 90 days of natural ageing.

Note: EN AW-7075 materials with copper can only be welded to a limited extent or not at all (risk of hot cracking).

Applications of EN AW-7020 alloy

Typical applications are highly loaded construction parts.
According to EN 602, the use of the EN AW-7020 material is NOT allowed the contact with food.

NameNumberStandardProductRemark
EN AW-AlZn4,5Mg1,5MnEN AW-7005
EN AW-7005
EN AW-7005
EN 485-2
EN 754-2
EN 755-2
Plate
Cold drawn rod/bar and tube
Extruded rod/bar, tube
EN 13445-8: No
EN 13445-8: No
EN 13445-8: No
EN AW-AlZn4,5Mg1EN AW-7020
EN AW-7020
EN AW-7020
EN 485-2
EN 754-2
EN 755-2

Plate
Cold drawn rod/bar and tube
Extruded rod/bar, tube
EN 13445-8: No
EN 13445-8: No
EN 13445-8: No
EN AW-AlZn5,5MgCu
EN AW-AlZn5,5MgCu
EN AW-AlZn5,5MgCu
EN AW-7075
EN AW-7075
EN AW-7075
EN 485
EN 754
EN 755
Plate, sheet, stripe
Cold drawn rod/bar and tube
Extruded rod/bar, tube
not weldable
not weldable
not weldable
Table: Typical materials