Aluminum 7020 Alloy (UNS A97020)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication
Applications

Introduction

The principal alloying ingredients in aluminium / aluminum alloys include manganese, magnesium, copper, zinc and silicon. The market for aluminium / aluminum and its alloys is huge. About 22 million t is newly manufactured aluminium and 7 million t is recycled aluminium scrap.

Aluminium / aluminum 7020 alloy is a heat treatable wrought alloy. Zinc forms a major part of this alloy.

The following datasheet will provide more details about aluminium / aluminum 7020 alloy.

Chemical Composition

The following table shows the chemical composition of aluminium / aluminum 7020 alloy.

Element Content (%)
Zinc, Zn 4-5
Magnesium, Mg 1-1.40
Zirconium, Zr + Titanium, Ti 0.80 - 0.25
Iron, Fe 0.4
Silicon, Si 0.35
Copper, Cu 0.2
Chromium, Cr 0.10 - 0.35
Zirconium, Zr 0.080 - 0.20
Manganese, Mn 0.050 - 0.50
Other (each) 0.05 max
Other (total) 0.15 max
Aluminum, Al Remainder

Physical Properties

The physical properties of aluminium / aluminum 7020 alloy are outlined in the following table.

Properties Metric Imperial
Density 2.78 g/cm³ 0.100 lb/in³

Mechanical Properties

The mechanical properties of aluminium / aluminum 7020-T6 alloy are tabulated below.

Properties Metric Imperial
Tensile strength (@thickness ≤100 mm/≤3.94 in) ≥ 350 MPa ≥ 50800 psi
Yield strength (@thickness ≤100 mm/≤3.94 in) ≥ 280 MPa ≥ 40600 psi
Elongation at break (@thickness ≤100 mm/≤3.94 in) ≥ 10% ≥ 10%

Thermal Properties

The thermal properties of aluminium / aluminum 7020-T6 alloy are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (@20-100°C/68-212°F) 23.1 µm/m°C 12.8 µin/in°F
Thermal conductivity 137 W/mK 951 BTU in/hr.ft².°F

Other Designations

Equivalent materials to aluminium / aluminum 7020 alloy are listed below:

  • BS H17
  • BA 733
  • EN AW - AlZn4, 5Mg
  • WS 3.4335
  • Hiduminium-45
  • Alcan GB-D74S

Fabrication

Forming and machining of aluminium / aluminum 7020 alloy is good. Welding, aesthetic anodizing and brazing or soldering is not suitable; however protective anodizing can be performed if required.

Applications

Aluminium / aluminum 7020 alloy is chiefly used in the following areas:

  • Frame manufacture, e.g. motorbike or bicycle frames
  • Military bridges
  • In armored vehicles.

Comments

  1. James Coyne James Coyne United States says:

    is 7020 a good choice for stamping applications?

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of AZoM.com.

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