6063A-AlMg0.7Si(A) Aluminium Pipes, Tubing & Tube (DIN, WNR)

Product Description

DIN 6063A / AlMg0.7Si(A) (Werkstoff-Nummer 3.32206) represents the high-yield structural refinement of the classic 6063 architectural alloy family.

Under the German DIN 1748 / DIN 1725 legacy frameworks and the contemporary EN 755 series, this material specification is designated with the "(A)" suffix to guarantee tighter compositional limits. This translates directly to more consistent precipitation hardening, higher minimum yield strengths, and tighter dimensional reliability for precision pipes, structural tubing, and hollow profiles.

Technical Identity & Cross-Reference Mapping

When cross-referencing global logistics bills, material test reports (MTRs), or historical design drawings, these designations all point to the exact same high-yield tube specification:

• Numerical Designation: EN AW-6063A

• Chemical Designation (DIN / EN): AlMg0.7Si(A) (or AlMg0.7Si-A)

• Material Number (WNr): 3.32206

• US Nearest Equivalent: AA 6063 (Note: Standard US 6063 permits a broader chemistry range; 6063A guarantees a higher minimum yield threshold than base ASTM 6063 structural minimums).

Chemical Profile Optimization (WNr 3.32206)

The chemical composition of 3.32206 is strictly bounded—particularly regarding Iron ($Fe$) and Manganese ($Mn$). Minimizing these impurities ensures that the Magnesium and Silicon combine perfectly into dense, uniform $Mg_2Si$ hardening phases without creating intermetallic brittleness.

Mechanical Boundaries (T6 Temper vs. Standard Grades)

The primary reason engineers specify the 6063A (AlMg0.7Si(A)) variant over standard 6063 or 6060 is the dependable jump in structural performance when fully heat-treated to the T6 / T66 state:

The $190\text{ MPa}$ yield point provides a robust safety margin for load-bearing frameworks, modular scaffolding, and medium-pressure fluid systems.

Manufacturing & Delivery Configurations

WNr 3.32206 tubes are ordered under distinct manufacturing profiles to match their engineering role:

1. Seamless Extruded Tubing (EN 755-7 / DIN 1748-2)

• The Process: Extruded over a mandrel from a solid pierced log. The tube wall is entirely homogeneous with zero internal microstructural seams.

• Primary Application: Critical for media-carrying pipes under internal pneumatic or hydraulic pressure, systems subject to high torsion, or components undergoing heavy cold-forming (e.g., flaring, swaging, expander bending).

2. Porthole / Bridge Extruded Tubing (EN 755-8 / DIN 1748-1)

• The Process: Extruded through a bridge die where separate streams of aluminum are fused back together inside the tooling matrix under extreme heat and pressure.

• Primary Application: Structural framing, solar mounting tracks, automotive sub-frames, handrails, and architectural accents where zero internal fluid pressure containment is required.

Processing & Finish Performance

• Anodizing & Surface Quality: Excellent. Because Iron is capped tightly at $0.35\%$, the alloy prevents the cloudy or uneven gray discoloration that affects higher-iron structures. It delivers crisp, predictable architectural clear and decorative color-anodized finishes.

• Weldability: Readily weldable using standard TIG or MIG protocols. For components targeted for subsequent anodizing, AA 5356 filler metal is highly recommended to achieve an optimal color match. AA 4043 is perfectly suited for purely structural welds.

• Note: Welding creates a localized Heat Affected Zone (HAZ) that drops the material strength back down to a soft T4 state unless post-weld solution aging is performed.