DIN 3.32206 Aluminium Pipes - WNr 3.32206 Pipe, Tube, Tubing

Product Description

DIN 3.32206 (Werkstoffnummer WNr 3.32206) is a technical designation within European and German standardization systems for a popular, medium-strength architectural and structural aluminum alloy. Globally, it is most widely recognized as AA 6063 (under the American Aluminum Association) or EN AW-6063 (under European Norms).

When specified for pipes, tubes, and hollow tubing, this material balances excellent surface finish, superior corrosion resistance, and optimal workability.

Global Cross-Reference & Equivalents

To match this grade across various international standards, use the following equivalent systems:

• UNS: A96063

• ISO Designation: AlMg0.7Si

• DIN Designation (Older): AlMgSi0.5

• EN Standard: EN AW-6063

• BS (UK, Old): HE9

• AA (USA): 6063

Nominal Chemical Composition (%)

The 3.32206 alloy belongs to the 6000-series (Silicon-Magnesium family). Its controlled chemistry allows for precipitation hardening (heat treatment):

Typical Mechanical Properties (T6 Temper)

Pipes and tubing in this grade are most frequently supplied in the T6 temper (solution heat-treated and artificially aged) to maximize strength while preserving reasonable ductility:

• Tensile Strength ($R_m$): $\approx 215 \text{ to } 245 \text{ MPa}$

• Yield Strength ($R_{p0.2}$): $\approx 170 \text{ to } 200 \text{ MPa}$

• Elongation ($A_{50mm}$): $\approx 8\% \text{ to } 12\%$

• Brinell Hardness: $\approx 75 \text{ to } 80 \text{ HBW}$

• Modulus of Elasticity: $\approx 70,000 \text{ N/mm}^2$

(Note: In the T4 temper, the material has much lower yield strength ($\approx 65 \text{ MPa}$) but increased formability, ideal for severe bending or manipulation before final aging).

Key Performance Characteristics

1. Extrudability & Formability

WNr 3.32206 is optimized for extrusion, allowing manufacturers to create complex, close-tolerance seamless or structural cross-sections. In its T4 or annealed condition, it responds exceptionally well to bending and hydroforming.

2. Surface Finish & Anodization

This grade yields an incredibly smooth mill finish and exhibits an excellent response to decorative and protective anodizing (clear, color, or hard coat). It is widely favored when aesthetic appeal is as important as mechanical performance.

3. Corrosion Resistance

It provides outstanding resistance to atmospheric corrosion and is highly resilient against stress-corrosion cracking (SCC) and general environmental degradation, even in marine environments.

4. Weldability

3.32206 pipes are readily weldable using standard TIG or MIG welding processes. However, welding locally reduces strength at the Heat-Affected Zone (HAZ). Post-weld heat treatment can be utilized to restore the T6 mechanical properties if structural integrity requires it.

Manufacturing Specifications & Product Forms

Pipes and tubes made from this material conform to a variety of structural and pressure testing standards depending on the processing method:

• Manufacturing Standards: ASTM B210 (Drawn Seamless Tubes), ASTM B221 / B241 (Extruded Seamless Pipe & Tube), ASTM B429 (Structural Pipe and Tube), EN 755 (Extruded rods, tubes, and profiles).

• Available Forms: * Seamless Tubing: Pierced and drawn for high-pressure or critical fluid conveyance applications.

  • Structural/Extruded Tubing: Produced over a bridge or porthole die, preferred for architectural frameworks and light structural grids.

• Dimensional Range: Outer diameters typically range from 6 mm up to 300 mm with wall thicknesses ranging from 0.5 mm up to 25 mm depending on processing parameters.

Key Applications

Because it balances structural capability with high visual quality, 3.32206 tubing is widely utilized across several sectors:

• Piping Systems: Irrigation systems, low-pressure pneumatic lines, conduit, and light industrial fluid lines.

• Automotive & Transit: Hydroformed structural chassis tubes, bus and rail vehicle frames, and decorative internal handrails.

• Architectural & Structural: Window/door profiles, modular shop fittings, balustrades, walkways, and architectural column covers.

• Electrical: Substation bus conductors and heavy-duty heat sink enclosures due to its excellent thermal and electrical conductivity.