GMW GMW15665 [ Revised ]

Material Description. The specification covers the chemical composition, mechanical properties, surface quality, and structural integrity requirements of hollow and semi-hollow aluminum alloy extruded profiles produced from welding chamber (i.e., spider, porthole, or bridge) dies and solid aluminum alloy extruded profiles produced from solid dies. Refer to the Aluminum Association Aluminum Standards and Data Manual - Metric International System of Metrics (SI) and/or EN755-1 for definitions of hollow, semi-hollow and solid extruded profiles.

Extruded profiles may be supplied in straight as-extruded lengths, or bent to meet desired part shape. Secondary forming operations (i.e., formation of crush initiators, flats, flanges) shall be performed before artificial aging heat treatment. For round aluminum alloy extruded tubing intended for General Motors North America (GMNA) hydroforming operations, refer to GMN7861.

The aluminum extrusion alloy and temper designations contained in this specification shall include aluminum alloys with temper mechanical property limits documented in a regional national standard - Aluminum Association (AA), European Standard (EN), American Society for Testing and Materials (ASTM), Japanese Industrial Standards (JIS), and aluminum alloys with temper mechanical property limits that deviate from regional national standards.

Material Identification. This specification shall be referenced in engineering math data files or engineering drawing material specifications. The material specification shall consist of the General Motors Worldwide (GMW) specification number, the materials type, non-ferrous metal type, alloy designation, the temper designation and minimum yield strength. See Section 8 "Coding System" for further explanation.

Symbols. A, A₅₀, A₈₀.

Typical Applications. Typical applications include body, closure, exterior and chassis structural applications. Refer to GM Materials Engineering or the Global Preferred Materials Catalog for selection of appropriate extrusion materials for specific applications.