Aluminium ENAW-AlMg0.7Si Bar & Rod(EU EN, DIN, WNR)

Product Description

The designation EN AW-AlMg0.7Si is the formal European chemical name for EN AW-6063. It is one of the most widely used aluminum alloys in the world for extrusion, favored heavily for bars, rods, and complex hollow profiles where surface finish and precise geometry are prioritized over raw tensile strength.

When specified under European frameworks (EU EN, DIN, WNr), this material is governed by EN 755 for extruded bars/rods or EN 754 for precision cold-drawn bars/rods.

1. Standard Mapping & Identifiers

The chemical designation tracks directly to several global and historical standards:

• Chemical Formula Name: EN AW-AlMg0.7Si

• Numerical Standard Code: EN AW-6063

• WNr (Werkstoffnummer): 3.3206

• Old DIN 1725-1 Baseline: AlMgSi0.5 (often mapped interchangeably based on the narrow magnesium/silicon balance)

• ISO Designation: Al-Mg0.7Si

2. Chemical Composition

The "0.7Si" and "AlMg" in the name emphasize the precise balancing of Magnesium and Silicon. This chemistry ensures that almost all of the magnesium pairs with silicon to form $Mg_2Si$ (Magnesium Silicide) intermetallic precipitates during heat treatment, leaving very little uncombined elements to interfere with its clear anodizing properties.

3. Mechanical Property Requirements (EN 755-2)

For EN AW-AlMg0.7Si round bars and rods up to 150 mm in diameter, mechanical properties are determined primarily by the temper condition. The most common commercial delivery conditions are T5 and T6.

4. Engineering & Processing Performance

• Surface Quality and Anodizing: This alloy has exceptional anodizing properties. Because it is highly free of heavy transition elements like manganese or high iron, it does not discolor or turn grayish during anodizing. It is ideal for high-sheen bright dipping, color anodizing, and clear protective hard-coating.

• Extrudability: EN AW-AlMg0.7Si is famously easy to extrude. It flows smoothly through complex multi-hollow dies, allowing manufacturers to achieve tight geometric tolerances directly from the press.

• Machinability: It is classified as moderately machinable. In its T6 state, it cuts reasonably well, but due to its ductility, it can produce continuous, gummy chips if cutting speeds are too low or if tooling lacks sharp, polished rakes.

• Weldability: It is highly weldable via standard TIG or MIG methods. However, because it is an age-hardened alloy, the heat from welding will destroy the $Mg_2Si$ precipitate network near the weld seam, causing the heat-affected zone (HAZ) to drop significantly in strength unless a full post-weld solution and aging heat treatment is performed.

5. Typical Structural & Mechanical Applications

• Precision Hardware: Machined spacers, bushings, and ornamental hardware.

• Electrical Engineering: Busbars, electrical conductor rods, and heavy-duty heatsink matrices due to high thermal and electrical conductivity.

• Architectural Elements: Extruded frameworks, window profiles, architectural trim, and decorative rails.